/* Library and study pages: quiet graphite surfaces, bronze only for action. */
.learning-page { --learn-bg:var(--ground); --learn-surface:var(--panel); --learn-raised:var(--panel-raised); --learn-line:var(--line); --learn-bronze:var(--gold); --learn-bronze-soft:var(--accent-surface); --learn-ink:var(--ink); --learn-muted:var(--muted); color:var(--learn-ink); }
.learning-heading { display:grid; grid-template-columns:minmax(0,1fr) minmax(260px, .72fr); align-items:end; gap:34px; margin:8px 0 28px; }
.learning-intro { max-width:720px; }
.learning-intro h1 { margin:0 0 10px; font-size:clamp(36px,4vw,52px); }
.learning-intro .lede { max-width:680px; margin:0; color:var(--learn-muted); }
.learning-kicker { margin:0 0 8px; color:var(--muted); font-size:13px; }
.learning-search { display:flex; align-items:center; gap:12px; min-height:54px; padding:0 16px; border:1px solid var(--learn-line); border-radius:9px; background:var(--panel); }
.learning-search-icon { color:var(--learn-muted); font-size:25px; }
.learning-search input { width:100%; min-width:0; border:0; outline:0; color:var(--learn-ink); background:transparent; font:15px var(--sans); }
.learning-search input::placeholder { color:var(--learn-muted); opacity:1; }
.library-filters { display:grid; grid-template-columns:repeat(4,minmax(130px,1fr)) auto; gap:12px; margin:24px 0 34px; }
.learning-select { min-height:48px; width:100%; padding:10px 14px; border:1px solid var(--learn-line); border-radius:8px; color:var(--learn-ink); background:var(--panel); }
.learning-reset { min-height:44px; padding:8px 14px; border:1px solid transparent; border-radius:7px; color:var(--learn-bronze); background:transparent; }
.learning-reset:hover { background:var(--learn-bronze-soft); }
.library-result-bar { display:flex; align-items:baseline; justify-content:space-between; gap:18px; margin:0 0 15px; }
.library-result-bar h2 { margin:0; font-size:25px; }
.library-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px; }
.library-card { display:flex; flex-direction:column; min-height:235px; padding:21px; border:1px solid var(--learn-line); border-radius:10px; background:linear-gradient(145deg,var(--panel),var(--panel) 70%); }
.library-card h3 { margin:0 0 9px; font-size:23px; }
.library-card-type { margin:0 0 10px; color:var(--learn-bronze); font-size:13px; }
.library-card-description { margin:0 0 14px; color:var(--learn-muted); line-height:1.55; }
.learning-meta { margin:0 0 14px; color:var(--muted); font-size:14px; line-height:1.5; }
.learning-card-action { align-self:flex-start; margin-top:auto; padding:8px 0; border:0; color:var(--learn-bronze); background:transparent; }
.learning-card-action:hover { color:var(--gold-soft); }
.library-detail { position:relative; margin-top:20px; padding:25px; border:1px solid var(--accent-border); border-radius:10px; background:var(--success-surface); }
.library-detail[hidden] { display:none; }
.library-detail h2 { margin:0 0 12px; font-size:32px; }
.library-detail > p:not(.learning-kicker) { max-width:78ch; color:var(--muted); }
.library-detail-top { display:flex; align-items:center; justify-content:space-between; gap:16px; }
.material-editor { max-width:790px; margin-top:52px; padding:26px; border:1px solid var(--learn-line); border-radius:10px; background:var(--panel); }
.learning-disclosure { margin-top:18px; border:1px solid var(--learn-line); border-radius:9px; background:var(--panel); }
.learning-disclosure>summary { display:flex; align-items:center; justify-content:space-between; min-height:58px; padding:15px 19px; cursor:pointer; color:var(--ink); list-style:none; }
.learning-disclosure>summary::-webkit-details-marker { display:none; }
.learning-disclosure>summary::after { content:"＋"; color:var(--learn-bronze); font-size:20px; }
.learning-disclosure[open]>summary::after { content:"−"; }
.learning-disclosure>.material-editor { margin:0; max-width:none; border:0; border-top:1px solid var(--learn-line); border-radius:0 0 9px 9px; }
.questions-disclosure>.section { margin:0; padding:20px; border-top:1px solid var(--learn-line); }
.questions-disclosure>.section>h2 { display:none; }
.questions-disclosure>.section>p:first-of-type { margin-top:0; }
.material-editor h2,.personal-materials>h2 { margin-bottom:8px; }
.material-editor .field textarea,.chapter-editor .field textarea { min-height:92px; }
.material-markdown-import { display:grid; gap:6px; margin:-8px 0 18px; padding:14px 16px; border:1px solid var(--learn-line); border-radius:8px; background:var(--panel); }
.material-markdown-import label { display:grid; gap:9px; color:var(--learn-ink); font-size:14px; }
.material-markdown-import input[type="file"] { max-width:100%; color:var(--learn-muted); font:14px var(--sans); }
.material-markdown-import p { margin:0; font-size:13px; line-height:1.5; }
.material-import-status:not(:empty) { color:var(--learn-bronze); }
.material-import-status.is-error { color:var(--red); }
.material-markdown { max-width:78ch; color:var(--muted); line-height:1.65; overflow-wrap:anywhere; }
.material-markdown > :first-child { margin-top:0; }
.material-markdown > :last-child { margin-bottom:0; }
.material-markdown h1,.material-markdown h2,.material-markdown h3,.material-markdown h4 { color:var(--learn-ink); line-height:1.3; }
.material-markdown a { color:var(--muted); text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); text-underline-offset:3px; }
.material-markdown blockquote { margin:1em 0; padding:.1em 0 .1em 1em; border-left:2px solid var(--accent-border); color:var(--learn-muted); }
.material-markdown pre { overflow:auto; padding:12px; border-radius:6px; background:var(--ground); }
.material-markdown code { padding:.1em .3em; border-radius:3px; background:var(--ground); }
.material-markdown pre code { padding:0; }
.material-markdown ul,.material-markdown ol { padding-left:1.5em; }
.material-markdown table { border-collapse:collapse; }
.material-markdown th,.material-markdown td { padding:6px 9px; border:1px solid var(--learn-line); }
.material-summary { max-height:320px; overflow:auto; }
.personal-materials { display:grid; gap:14px; margin-top:42px; }
.personal-materials>h2 { margin:0 0 2px; }
.material-row { display:grid; gap:7px; padding:22px; border:1px solid var(--learn-line); border-radius:9px; background:var(--panel); }
.material-row h3 { margin:0; }
.material-row .learning-card-description { max-width:88ch; }
.material-chapter { margin-top:7px; padding:13px 15px; border-left:1px solid var(--accent-border); background:var(--panel); }
.material-chapter summary { cursor:pointer; color:var(--ink); }
.material-chapter .material-markdown { margin-top:12px; }
.chapter-editor { max-width:650px; margin:9px 0; }
.learning-empty { grid-column:1/-1; text-align:left; border-color:var(--learn-line); background:var(--panel); }
.study-page .learning-heading { display:block; margin-bottom:32px; }
.study-page .learning-intro { max-width:780px; }
.study-page .learning-intro h1 { margin-bottom:10px; }
.learning-back { margin-top:17px; padding:7px 0; border:0; color:var(--learn-bronze); background:transparent; }
.learning-back:hover { color:var(--gold-soft); }
.study-feature { max-width:980px; padding:27px 30px; border:1px solid var(--learn-line); border-radius:10px; background:linear-gradient(115deg,var(--panel-raised),var(--panel) 76%); }
.study-feature h2 { margin:0 0 10px; font-size:35px; }
.study-feature>p:not(.learning-kicker):not(.learning-meta) { max-width:70ch; color:var(--muted); }
.study-progress { display:grid; grid-template-columns:minmax(180px,1fr) minmax(120px,1.4fr) auto; align-items:center; gap:16px; margin-top:22px; padding-top:20px; border-top:1px solid var(--learn-line); }
.study-progress h3 { margin:0 0 3px; font-size:21px; }
.study-progress p { margin:0; }
.study-progress .learning-meta { grid-column:1/-1; font-size:12px; }
.study-progress-track { height:7px; overflow:hidden; border-radius:8px; background:var(--panel-raised); }
.study-progress-track span { display:block; width:100%; height:100%; border-radius:inherit; background:var(--learn-bronze); transform:scaleX(var(--study-progress,0)); transform-origin:left center; transition:transform .2s ease; }
.study-module { display:grid; grid-template-columns:45px minmax(0,1fr) minmax(120px,auto) auto; align-items:center; gap:17px; padding:18px 15px; border-bottom:1px solid var(--panel-raised); }
.study-module.is-current { background:var(--accent-surface); }
.study-module-number { color:var(--learn-bronze); font-variant-numeric:tabular-nums; }
.study-module-copy h3 { margin:0 0 4px; font-size:22px; }
.study-module-copy p { margin:0; }
.study-module-state { justify-self:end; }
.study-status { display:inline-block; padding:6px 10px; border:1px solid var(--learn-line); border-radius:20px; color:var(--learn-muted); font-size:13px; }
.status-in_progress { border-color:var(--accent-border); color:var(--gold); }
.status-completed { border-color:color-mix(in srgb, var(--green) 45%, var(--line)); color:var(--green); }
.study-lesson { max-width:900px; margin:8px 0 30px; padding:30px; border:1px solid var(--learn-line); border-radius:10px; background:var(--panel); }
.study-lesson h2 { margin:0 0 14px; font-size:36px; }
.study-lesson>p:not(.learning-kicker) { max-width:78ch; font-size:17px; line-height:1.65; }
.study-lesson-actions { display:flex; align-items:center; flex-wrap:wrap; gap:16px; margin-top:25px; }
.study-lesson-actions .learning-back { margin:0; }
.study-tools { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px; max-width:980px; margin:16px 0 34px; }
.study-tool-card { display:grid; align-content:start; min-height:190px; padding:22px; border:1px solid var(--learn-line); border-radius:9px; background:var(--panel); }
.study-tool-card h3 { margin:0 0 8px; font-size:24px; }
.study-tool-card>p:not(.learning-meta) { max-width:48ch; margin:0 0 12px; color:var(--learn-muted); }
.study-tool-card .learning-meta { margin-bottom:5px; }
.study-tool-card .learning-card-action { margin-top:0; justify-self:start; }
.study-page .study-section { max-width:1000px; }
.study-page .timeline-event h3 { margin:0; font-size:22px; }
.study-section { margin:34px 0; }
.study-section-heading { display:flex; align-items:end; justify-content:space-between; gap:20px; margin-bottom:15px; }
.study-section-heading h2 { margin:0 0 4px; font-size:30px; }
.study-section-heading p { margin:0; }
.study-section-heading .learning-select { max-width:280px; }
.learning-timeline { border-top:1px solid var(--learn-line); }
.timeline-event { display:grid; grid-template-columns:115px minmax(0,1fr); gap:26px; padding:19px 14px; border-bottom:1px solid var(--panel-raised); }
.timeline-event.is-selected { background:var(--accent-surface); }
.event-date { color:var(--learn-bronze); font-variant-numeric:tabular-nums; text-align:right; white-space:nowrap; padding-top:3px; }
.event-copy p { margin:7px 0 0; max-width:850px; }
.study-detail { margin:26px 0; padding:25px 28px; border:1px solid var(--learn-line); border-radius:10px; background:var(--learn-surface); }
.study-detail[hidden] { display:none; }
.study-detail h2 { margin:0 0 10px; font-size:32px; }
.study-detail>p:not(.learning-kicker) { max-width:68ch; color:var(--muted); font-size:16px; line-height:1.7; }
.study-sources,.study-relations { display:grid; gap:12px; margin-top:28px; max-width:72ch; }
.study-sources h3,.study-relations>h3 { margin:0; color:var(--ink); font:400 22px/1.25 var(--serif); }
.study-source-list { display:grid; gap:8px; margin:0; padding:0; list-style:none; }
.study-source-list a { color:var(--muted); font-size:14px; line-height:1.5; text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); text-underline-offset:3px; overflow-wrap:anywhere; }
.study-source-list a:hover { color:var(--gold-soft); text-decoration-color:currentColor; }
.study-relation-list { display:grid; gap:12px; }
.study-relation { display:grid; gap:8px; padding:14px 16px; border-left:2px solid color-mix(in srgb, var(--muted) 50%, var(--ground)); background:var(--panel); }
.study-relation-title { justify-self:start; padding:0; border:0; background:transparent; color:var(--ink); font:500 16px/1.45 var(--sans); text-align:left; }
.study-relation-title:hover { color:var(--gold-soft); }
.study-relation-description { max-width:68ch; margin:0; color:var(--muted); font-size:14px; line-height:1.6; }
.study-relation-sources { display:flex; flex-wrap:wrap; gap:6px 16px; margin:2px 0 0; padding:0; list-style:none; }
.study-relation-sources a { color:var(--muted); font-size:12px; line-height:1.45; text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); }
.study-relation-sources a:hover { color:var(--gold-soft); }

.learning-graph { overflow:hidden; padding:0; border:1px solid var(--learn-line); border-radius:10px; background:var(--panel); }
.kg-toolbar { display:flex; align-items:end; flex-wrap:wrap; gap:10px; padding:15px; border-bottom:1px solid var(--learn-line); }
.kg-search-label { display:grid; gap:5px; min-width:min(100%,260px); color:var(--learn-muted); font-size:12px; }
.kg-search { min-height:38px; padding:8px 10px; border:1px solid var(--line); border-radius:5px; background:var(--ground); color:var(--ink); }
.kg-toolbar button { min-height:38px; padding:7px 11px; border:1px solid var(--line); border-radius:5px; background:var(--panel-raised); color:var(--ink); }
.kg-toolbar button:hover,.kg-toolbar button[aria-pressed="true"] { border-color:var(--accent-border); color:var(--gold-soft); }
.kg-toolbar .kg-3d-toggle { min-width:56px; font-variant:small-caps; letter-spacing:.04em; }
.kg-toolbar button:disabled { opacity:.45; cursor:not-allowed; }
.kg-toolbar button:focus-visible,.kg-search:focus-visible,.kg-event:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; }
.kg-event>i { display:inline-block; width:8px; height:8px; flex:none; border-radius:50%; background:var(--kg-topic); }
.kg-layout { display:grid; grid-template-columns:minmax(0,1fr); min-height:510px; }
.kg-canvas { position:relative; min-width:0; min-height:510px; background-image:radial-gradient(var(--panel-raised) 0.7px,transparent 0.7px); background-size:24px 24px; }
.kg-canvas canvas { display:block; }
.kg-index { display:flex; flex-direction:column; min-height:0; border-left:1px solid var(--panel-raised); }
.kg-index[hidden] { display:none; }
.kg-layout.is-fallback .kg-index { border-top:1px solid var(--panel-raised); border-left:0; }
.kg-index-heading { display:flex; justify-content:space-between; gap:10px; margin:0; padding:14px 13px 10px; color:var(--muted); font-size:12px; }
.kg-index-heading span { color:var(--learn-muted); font-variant-numeric:tabular-nums; }
.kg-list { overflow:auto; max-height:510px; padding:0 7px 9px; }
.kg-event { display:flex; align-items:center; gap:9px; width:100%; padding:9px 7px; border:0; border-radius:4px; background:transparent; color:var(--muted); text-align:left; cursor:pointer; }
.kg-event:hover,.kg-event.is-selected { background:var(--panel-raised); }
.kg-event.is-selected { box-shadow:inset 2px 0 var(--kg-topic); }
.kg-event>span { display:grid; min-width:0; gap:3px; }
.kg-event strong,.kg-event small { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.kg-event strong { font-size:13px; font-weight:500; }
.kg-event small { color:var(--learn-muted); font-size:12px; }
.kg-no-results { padding:8px; color:var(--learn-muted); font-size:12px; }
.kg-status { min-height:28px; margin:0; padding:7px 13px; border-top:1px solid var(--panel-raised); color:var(--learn-muted); font-size:12px; }
@media (max-width:780px) { .kg-layout { grid-template-columns:1fr; } .kg-index { border-top:1px solid var(--panel-raised); border-left:0; } .kg-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); max-height:230px; } .kg-canvas { min-height:400px; } }
@media (max-width:460px) { .kg-list { grid-template-columns:1fr; } .kg-canvas { min-height:340px; } }
@media (prefers-reduced-motion:reduce) { .kg-layout * { scroll-behavior:auto; } }
@media(max-width:1050px) { .library-grid{grid-template-columns:repeat(2,minmax(0,1fr));}.library-filters{grid-template-columns:repeat(2,minmax(0,1fr));}.learning-heading{grid-template-columns:1fr;gap:18px;} }
@media(max-width:600px) { .library-grid,.library-filters,.study-tools{grid-template-columns:1fr;}.library-card{min-height:0;}.timeline-event{grid-template-columns:90px minmax(0,1fr);gap:12px;padding:16px 8px;}.study-section-heading{align-items:stretch;flex-direction:column;}.study-section-heading .learning-select{max-width:none;}.study-detail,.material-editor,.library-detail,.study-feature,.study-lesson{padding:19px;}.learning-intro h1{font-size:44px;}.study-progress{grid-template-columns:1fr;}.study-progress .learning-meta{grid-column:auto;}.study-module{grid-template-columns:30px 1fr;}.study-module-state,.study-module>.learning-card-action{grid-column:2;justify-self:start;} }

.library-cover{display:block;width:calc(100% + 42px);max-width:none;height:140px;object-fit:cover;margin:-21px -21px 16px;filter:saturate(.65);border-radius:9px 9px 0 0}

/* Library sections follow the same quiet editorial grid as Study and Reviews. */
.library-page { display:grid; grid-template-columns:minmax(0,1fr); gap:18px; }
.library-heading { display:flex; align-items:flex-end; justify-content:space-between; gap:24px; margin:0 0 4px; }
.library-intro h1 { margin:0 0 5px; color:var(--learn-ink); font:400 clamp(42px,4vw,54px)/1.04 var(--serif); letter-spacing:-.025em; }
.library-intro .lede { max-width:70ch; margin:0; color:var(--learn-muted); }
.library-add-button { min-height:42px; flex:none; color:var(--gold); border-color:var(--accent-border); background:var(--panel); font-size:13px; }
.library-add-button:hover { border-color:var(--accent-border); background:var(--panel-raised); }
.library-page-materials .library-heading { align-items:center; margin-bottom:20px; }
.library-page-materials .library-intro h1 { font-size:clamp(44px,4vw,56px); text-wrap:balance; }
.library-page-materials .library-intro .lede { max-width:74ch; font-size:18px; }
.library-page-materials .library-add-button { box-sizing:border-box; width:300px; min-width:300px; min-height:56px; padding:0 20px; font-size:16px; }
.library-page-materials .library-add-menu > summary { justify-content:space-between; }
.library-page-materials .library-add-menu-panel { top:calc(100% + 2px); width:300px; }
.library-page-materials .library-add-menu-option { min-height:58px; padding:0 16px; font-size:16px; }
.library-add-menu { position:relative; flex:none; z-index:5; }
.library-add-menu > summary { display:inline-flex; align-items:center; justify-content:center; gap:10px; padding:0 16px; cursor:pointer; list-style:none; touch-action:manipulation; }
.library-add-menu > summary::-webkit-details-marker { display:none; }
.library-add-plus { color:var(--gold); font:400 24px/1 var(--sans); }
.library-add-menu > summary > svg { color:var(--gold); transition:transform .16s ease; }
.library-add-menu[open] > summary > svg { transform:rotate(180deg); }
.library-add-menu-panel { position:absolute; top:calc(100% + 7px); right:0; display:grid; box-sizing:border-box; width:286px; padding:6px; border:1px solid var(--line); border-radius:8px; background:var(--panel); box-shadow:0 14px 36px #05080988; }
.library-add-menu-option { display:flex; min-height:52px; align-items:center; gap:11px; padding:0 13px; border:0; border-radius:5px; color:var(--ink); background:transparent; font:14px var(--sans); text-align:left; cursor:pointer; touch-action:manipulation; }
.library-add-menu-option svg { flex:none; color:var(--gold); }
.library-add-menu-option + .library-add-menu-option { border-top:1px solid var(--line); border-radius:0 0 5px 5px; }
.library-add-menu-option:hover { color:var(--gold-soft); background:var(--panel-raised); }
.library-add-menu-option:focus-visible,.library-add-menu > summary:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; }
.library-search { display:flex; min-height:52px; align-items:center; gap:13px; padding:0 16px; border:1px solid var(--line); border-radius:9px; color:var(--muted); background:var(--panel); }
.library-search input { min-width:0; width:100%; height:48px; border:0; outline:0; color:var(--learn-ink); background:transparent; font:14px var(--sans); }
.library-search input::placeholder { color:var(--muted); opacity:1; }
.library-result-status { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip-path:inset(50%); white-space:nowrap; }
.library-page .learning-empty.library-search-empty { display:grid; justify-items:start; gap:10px; padding:24px; }
.library-search-empty h2 { margin:0; font-size:26px; }
.library-search-empty p { max-width:58ch; margin:0; color:var(--learn-muted); font-size:14px; }
.library-search-reset { margin-top:4px; font-size:14px; }
.library-page .library-filters { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)) auto; gap:9px; margin:0; }
.library-page .learning-select { min-width:0; min-height:48px; appearance:none; padding:10px 42px 10px 16px; border-color:var(--line); border-radius:7px; color:var(--learn-ink); background:var(--panel); font-size:14px; }
.library-page select.learning-select { background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath d='m3 6 5 5 5-5' fill='none' stroke='%23A1B0BE' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); background-repeat:no-repeat; background-position:right 16px center; }
.library-tabs { display:flex; align-items:center; gap:23px; min-height:40px; overflow:auto; border-bottom:1px solid var(--line); scrollbar-width:thin; }
.library-tab { position:relative; min-height:40px; padding:0 1px; flex:none; border:0; color:var(--muted); background:transparent; font:13px var(--sans); cursor:pointer; }
.library-tab:hover,.library-tab.is-active { color:var(--gold); }
.library-tab.is-active::after { content:""; position:absolute; inset:auto 0 -1px; height:2px; background:var(--gold); }
.library-section-head { display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin:0 0 11px; }
.library-section-head h2 { margin:0; font:400 25px/1.2 var(--serif); color:var(--ink); }
.library-count { flex:none; color:var(--gold); font-size:12px; }
.library-item-list { display:grid; gap:6px; }
.library-item-row { display:grid; grid-template-columns:92px minmax(0,1fr) auto; min-height:76px; align-items:center; gap:14px; padding:6px 10px 6px 7px; border:1px solid var(--line); border-radius:8px; background:var(--panel); content-visibility:auto; contain-intrinsic-size:auto 88px; }
.library-item-thumb { display:block; width:92px; height:61px; object-fit:cover; border-radius:5px; filter:saturate(.72) brightness(.86); }
.library-item-mark { display:grid; width:92px; height:61px; place-items:center; border-radius:5px; color:var(--gold); background:var(--panel-raised); font-size:21px; }
.library-item-mark svg { width:24px; height:24px; }
.library-item-copy { display:grid; min-width:0; gap:3px; }
.library-item-copy strong { min-width:0; color:var(--ink); font:400 19px/1.2 var(--serif); overflow-wrap:anywhere; }
.library-item-copy small { min-width:0; color:var(--muted); font-size:12px; line-height:1.4; overflow-wrap:anywhere; }
.library-item-description { display:-webkit-box; overflow:hidden; color:var(--muted); font-size:12px; line-height:1.4; overflow-wrap:anywhere; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.library-item-actions { display:flex; align-items:center; justify-content:flex-end; gap:8px; flex-wrap:wrap; }
.library-row-action { min-height:34px; padding:6px 12px; border:1px solid var(--accent-border); border-radius:6px; color:var(--gold); background:var(--panel-raised); font-size:12px; cursor:pointer; }
.library-row-action:hover,.library-row-action.is-saved { border-color:var(--accent-border); background:var(--accent-surface); color:var(--gold-soft); }
.library-collection-select { max-width:150px; min-height:34px; padding:5px 8px; border:1px solid var(--line); border-radius:6px; color:var(--muted); background:var(--panel); font:12px var(--sans); }
.library-add-disclosure { border:1px solid var(--line); border-radius:8px; background:var(--panel); }
.library-add-disclosure>summary { display:flex; min-height:48px; align-items:center; padding:0 15px; color:var(--gold); font-size:13px; cursor:pointer; }
.library-add-disclosure[open]>summary { border-bottom:1px solid var(--line); }
.library-add-disclosure>.material-upload { margin:0; padding:20px; border:0; background:transparent; }
.library-add-disclosure .material-editor { margin:16px 0 0; }
.library-materials-section { display:grid; gap:0; margin:0; }
.library-material-tabs { display:flex; align-items:center; flex-wrap:wrap; gap:12px; margin:0 0 21px; }
.library-material-tab { display:inline-flex; min-height:56px; align-items:center; gap:10px; padding:0 22px; border:1px solid var(--line); border-radius:7px; color:var(--muted); background:var(--panel); font:16px/1 var(--sans); cursor:pointer; touch-action:manipulation; transition:border-color .16s,background-color .16s,color .16s; }
.library-material-tab:hover { border-color:var(--accent-border); color:var(--ink); }
.library-material-tab.is-active { border-color:var(--accent-border); color:var(--gold-soft); background:var(--accent-surface); }
.library-material-tab-count { display:inline-flex; min-width:0; height:auto; align-items:center; justify-content:center; padding:0; color:inherit; background:transparent; font-variant-numeric:tabular-nums; }
.library-material-tab.is-active .library-material-tab-count { color:var(--gold-soft); }
.library-material-tab:focus-visible,.library-material-open:focus-visible,.library-material-more:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; }
.library-material-count { margin:0 0 9px; color:var(--muted); font-size:12px; line-height:1.4; }
.library-material-list { display:grid; gap:8px; }
.library-material-row { display:grid; grid-template-columns:96px minmax(0,1fr) 226px; min-height:110px; align-items:center; gap:16px; padding:8px 12px; border:1px solid var(--line); border-radius:8px; background:linear-gradient(100deg,var(--panel),var(--panel)); transition:border-color .16s,background-color .16s; }
.library-material-row:hover { border-color:var(--accent-border); background:var(--panel); }
.library-material-row.is-expanded,.library-material-row.is-expanded:hover { border-color:var(--line); }
.library-material-thumb { position:relative; display:grid; width:96px; height:90px; place-items:center; overflow:hidden; color:var(--gold); border:1px solid var(--line); border-radius:6px; background:linear-gradient(145deg,var(--panel-raised),var(--panel)); }
.library-material-thumb.is-document { color:var(--gold); background:linear-gradient(145deg,var(--accent-surface),var(--panel)); }
.library-material-thumb.is-note, .library-material-thumb.is-summary { color:var(--blue); background:linear-gradient(145deg,var(--panel-raised),var(--panel)); }
.library-material-thumb svg { width:25px; height:25px; }
.library-material-thumb figure { position:absolute; inset:0; width:100%; height:100%; margin:0; }
.library-material-thumb figure img { display:block; width:100% !important; height:100% !important; object-fit:cover; filter:saturate(.72) brightness(.78); }
.library-material-thumb figcaption { display:none; }
.library-material-copy { display:grid; min-width:0; gap:6px; margin-left:13px; }
.library-material-title-row { display:flex; min-width:0; align-items:center; flex-wrap:wrap; gap:10px; }
.library-material-title-row h2 { min-width:0; max-width:100%; margin:0; overflow-wrap:anywhere; color:var(--ink); font:400 22px/1.12 var(--serif); }
.library-material-type,.library-material-status { display:inline-flex; min-height:27px; align-items:center; padding:5px 10px; border:1px solid var(--line); border-radius:5px; color:var(--muted); background:var(--panel-raised); font-size:13px; line-height:1.2; }
.library-material-type.is-note, .library-material-type.is-summary { color:var(--blue); border-color:var(--line); background:var(--panel-raised); }
.library-material-type.is-document { color:var(--gold); }
.library-material-meta { display:flex; min-width:0; flex-wrap:wrap; gap:0; margin:0; color:var(--muted); font-size:15px; line-height:1.4; font-variant-numeric:tabular-nums; }
.library-material-source-name { overflow-wrap:anywhere; }
.library-material-statuses { display:flex; flex-wrap:wrap; gap:6px; }
.library-material-status { min-height:23px; color:var(--green); border-color:var(--line); background:var(--panel-raised); }
.library-material-status.is-processing { color:var(--green); }
.library-material-actions { display:flex; min-width:226px; align-items:center; gap:26px; }
.library-material-open { display:inline-flex; min-width:152px; min-height:56px; align-items:center; justify-content:center; gap:10px; padding:0 15px; border:1px solid var(--accent-border); border-radius:6px; color:var(--gold-soft); background:var(--panel-raised); font:16px var(--sans); cursor:pointer; touch-action:manipulation; transition:border-color .16s,background-color .16s,color .16s; }
.library-material-open:hover { border-color:var(--accent-border); color:var(--gold-soft); background:var(--accent-surface); }
.library-material-open svg { flex:none; }
.library-material-more-menu { position:relative; }
.library-material-more { display:grid; width:48px; height:52px; place-items:center; border:1px solid var(--line); border-radius:6px; color:var(--muted); background:var(--panel); font:22px/1 var(--sans); letter-spacing:1px; cursor:pointer; list-style:none; touch-action:manipulation; }
.library-material-more::-webkit-details-marker { display:none; }
.library-material-more:hover,.library-material-more-menu[open] .library-material-more { border-color:var(--line-strong); background:var(--panel-raised); }
.library-material-more-panel { position:absolute; z-index:6; top:calc(100% + 6px); right:0; display:grid; min-width:160px; padding:5px; border:1px solid var(--line); border-radius:7px; background:var(--panel); box-shadow:0 12px 32px #05080988; }
.library-material-menu-action { min-height:36px; padding:7px 9px; border:0; border-radius:4px; color:var(--muted); background:transparent; font:13px var(--sans); text-align:left; cursor:pointer; }
.library-material-menu-action:hover { background:var(--panel-raised); }
.library-material-menu-action:focus-visible,.library-add-dialog-close:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; }
.library-material-menu-action.is-danger { color:var(--red); }
.library-material-detail { grid-column:1/-1; display:grid; gap:18px; margin:6px 2px 2px; padding:19px 15px 13px; border-top:1px solid var(--line); }
.library-material-detail[hidden] { display:none; }
.library-material-empty { display:grid; grid-template-columns:54px minmax(0,1fr); align-items:center; gap:17px; min-height:124px; padding:18px 13px; border:1px solid var(--line); border-radius:7px; background:var(--panel); }
.library-material-empty-mark { display:grid; width:48px; height:48px; place-items:center; color:var(--gold); border:1px solid var(--accent-border); border-radius:50%; background:var(--accent-surface); }
.library-material-empty-copy h2 { margin:0 0 5px; color:var(--ink); font:400 23px/1.16 var(--serif); text-wrap:balance; }
.library-material-empty-copy p { max-width:62ch; margin:0; color:var(--muted); font-size:14px; line-height:1.5; }
.library-questions-section { margin-top:22px; border:0; border-top:1px solid var(--line); border-radius:0; background:transparent; }
.library-questions-section>summary { min-height:48px; padding:7px 0; }
.library-questions-section>summary:focus-visible,.library-material-detail .material-original>summary:focus-visible,.material-upload-storage>summary:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; border-radius:3px; }
.library-questions-section>.section { padding-top:18px; }
.library-inline-hint { display:flex; align-items:center; justify-content:space-between; gap:20px; padding:17px 20px; border:1px solid var(--line); border-radius:8px; color:var(--ink); background:var(--panel); font:400 20px/1.2 var(--serif); }
.library-inline-link { flex:none; border:0; color:var(--gold); background:transparent; font:13px var(--sans); cursor:pointer; }
.library-inline-link:hover { color:var(--gold-soft); }
.library-create-form { display:grid; grid-template-columns:1fr 1.25fr auto; align-items:end; gap:12px; padding:15px; border:1px solid var(--line); border-radius:8px; background:var(--panel); }
.library-create-form[hidden] { display:none; }
.library-create-form .field { margin:0; }
.library-create-form .field input { min-height:41px; }
.library-create-form .btn { min-height:41px; white-space:nowrap; }
.library-collection-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:13px; }
.library-collection-card { min-width:0; padding:16px 18px; border:1px solid var(--line); border-radius:8px; background:var(--panel); }
.library-collection-card[open] { border-color:var(--accent-border); }
.library-collection-summary { display:flex; min-height:30px; align-items:center; gap:11px; list-style:none; cursor:pointer; }
.library-collection-summary::-webkit-details-marker { display:none; }
.library-collection-mark { color:var(--gold); font-size:18px; }
.library-collection-title { flex:1; color:var(--ink); font:400 24px/1.15 var(--serif); }
.library-collection-count { flex:none; color:var(--gold); font-size:12px; }
.library-collection-description { margin:7px 0 13px; color:var(--muted); font-size:12px; }
.library-collection-preview { display:flex; gap:3px; min-height:32px; align-items:center; }
.library-collection-preview img,.library-collection-preview-mark { width:38px; height:30px; object-fit:cover; border-radius:3px; color:var(--gold); background:var(--panel-raised); }
.library-collection-contents { display:grid; gap:8px; margin-top:16px; padding-top:14px; border-top:1px solid var(--line); }
.library-collection-contents .library-item-row { grid-template-columns:70px minmax(0,1fr) auto; background:var(--panel); }
.library-collection-contents .library-item-thumb,.library-collection-contents .library-item-mark { width:70px; height:50px; }
.library-collection-empty { margin:0; color:var(--muted); font-size:12px; line-height:1.5; }
.library-collection-actions { display:flex; justify-content:flex-end; gap:8px; flex-wrap:wrap; }
.library-rename-form { display:flex; gap:8px; width:100%; }
.library-rename-form input { min-width:0; flex:1; }
.library-empty-action { justify-self:start; padding:8px 0; border:0; color:var(--gold); background:transparent; font-size:13px; cursor:pointer; }
.library-more { justify-self:center; min-height:38px; margin-top:9px; padding:7px 14px; border:1px solid var(--line); border-radius:6px; color:var(--gold); background:var(--panel); font:12px var(--sans); cursor:pointer; }
.library-more:hover { border-color:var(--accent-border); background:var(--panel-raised); }
.library-more[hidden] { display:none; }
.library-page .learning-empty { display:grid; justify-items:start; gap:6px; padding:20px; color:var(--muted); }
@media(prefers-reduced-motion:reduce) {
  .library-add-menu > summary > svg,.library-material-tab,.library-material-row,.library-material-open { transition:none; }
}
@media(max-width:900px) {
  .library-page .library-filters { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .library-item-row { grid-template-columns:78px minmax(0,1fr); }
  .library-item-thumb,.library-item-mark { width:78px; height:58px; }
  .library-item-actions { grid-column:2; justify-content:flex-start; }
}
@media(max-width:760px) {
  .library-page-materials .library-heading { align-items:flex-start; flex-wrap:wrap; }
  .library-page-materials .library-add-menu { margin-left:auto; }
}
@media(min-width:601px) and (max-width:760px) {
  .library-page-materials .library-add-button { width:260px; min-width:260px; }
}
@media(max-width:1320px) {
  .library-page-materials .library-heading:has(.library-add-menu[open]) { align-items:flex-start; }
  .library-page-materials .library-add-menu[open] .library-add-menu-panel { width:min(300px,calc(100vw - 32px)); }
}
@media(max-width:600px) {
  .library-page { gap:14px; }
  .library-heading { align-items:flex-start; }
  .library-intro h1 { font-size:40px; }
  .library-add-button { display:grid; width:42px; min-width:42px; max-width:42px; height:42px; place-items:center; overflow:hidden; padding:0; font-size:0; }
  .library-add-button::before { content:"+"; color:var(--gold); font:400 23px/1 var(--sans); }
  .library-page-materials .library-heading { align-items:center; gap:12px; }
  .library-page-materials .library-add-button { display:inline-flex; width:auto; min-width:0; max-width:none; height:42px; min-height:42px; padding:0 11px; overflow:visible; font-size:12px; }
  .library-page-materials .library-add-button::before { content:none; }
  .library-page-materials .library-add-plus { font-size:20px; }
  .library-add-menu-panel { width:min(300px,calc(100vw - 32px)); }
  .library-material-tabs { gap:7px; margin-bottom:15px; }
  .library-material-tab { min-height:42px; gap:7px; padding:0 10px; font-size:12px; }
  .library-material-tab-count { min-width:20px; height:24px; padding:0 5px; font-size:12px; }
  .library-material-count { margin-bottom:7px; }
  .library-material-row { grid-template-columns:56px minmax(0,1fr); align-items:start; gap:10px; padding:8px; }
  .library-material-thumb { width:52px; height:58px; }
  .library-material-copy { grid-column:2; grid-row:1; gap:5px; margin-left:0; padding-top:2px; }
  .library-material-title-row h2 { font-size:18px; }
  .library-material-meta { font-size:12px; }
  .library-material-type,.library-material-status { min-height:22px; padding:3px 7px; font-size:12px; }
  .library-material-actions { grid-column:2; grid-row:2; min-width:0; justify-content:flex-start; gap:9px; }
  .library-material-open { min-width:105px; min-height:38px; font-size:12px; }
  .library-material-more { width:38px; height:38px; }
  .library-material-detail { grid-column:1/-1; grid-row:3; padding:15px 5px 8px; }
  .library-material-empty { grid-template-columns:44px minmax(0,1fr); gap:12px; min-height:110px; padding:15px 7px; }
  .library-material-empty-mark { width:42px; height:42px; }
  .library-material-empty-copy h2 { font-size:20px; }
  .library-collection-grid { grid-template-columns:1fr; }
  .library-page .library-filters { grid-template-columns:1fr 1fr; }
  .library-tabs { gap:17px; }
  .library-item-row { grid-template-columns:62px minmax(0,1fr); gap:10px; padding:7px; }
  .library-item-thumb,.library-item-mark { width:62px; height:50px; }
  .library-item-copy strong { font-size:17px; }
  .library-item-actions { grid-column:1/-1; justify-content:flex-start; }
  .library-create-form { grid-template-columns:1fr; }
  .library-inline-hint { align-items:flex-start; flex-direction:column; }
}

/* The public catalog is a searchable shelf: filters first, one result grid, no duplicate recommendation rows. */
.library-page-catalog .library-heading { align-items:center; margin-bottom:4px; }
.library-page-catalog .library-intro h1 { font-size:clamp(44px,4vw,56px); text-wrap:balance; }
.library-page-catalog .library-intro .lede { max-width:76ch; font-size:18px; }
.library-page-catalog .library-add-button { box-sizing:border-box; width:300px; min-width:300px; min-height:56px; padding:0 18px; font-size:16px; }
.library-page-catalog .library-add-menu > summary { justify-content:space-between; }
.library-page-catalog .library-add-menu-panel { top:calc(100% + 2px); width:300px; }
.library-page-catalog .library-heading:has(.library-add-menu[open]) { align-items:flex-start; }
.library-page-catalog .library-add-menu[open] .library-add-menu-panel { width:300px; }
.library-page-catalog .library-add-menu-option { min-height:58px; padding:0 16px; font-size:16px; }
.library-page-catalog .library-search { min-height:58px; }
.library-page-catalog .library-search input { height:54px; font-size:16px; }
.library-page-catalog .library-filters { gap:12px; margin-top:-2px; }
.library-page-catalog .library-tabs { gap:10px; min-height:44px; overflow-x:auto; border:0; scrollbar-width:thin; }
.library-page-catalog .library-tab { display:inline-flex; min-height:44px; align-items:center; gap:8px; padding:0 10px; border:1px solid transparent; border-radius:7px; color:var(--muted); background:transparent; font-size:14px; touch-action:manipulation; }
.library-page-catalog .library-tab:hover { border-color:var(--accent-border); color:var(--ink); background:var(--panel-raised); }
.library-page-catalog .library-tab.is-active { border-color:var(--gold); color:var(--gold-soft); background:var(--accent-surface); }
.library-page-catalog .library-tab.is-active::after { content:none; }
.library-tab-count { display:inline-flex; min-width:0; height:28px; align-items:center; justify-content:center; padding:0 7px; border-radius:6px; color:var(--muted); background:var(--panel-raised); font-size:12px; font-variant-numeric:tabular-nums; }
.library-page-catalog .library-tab.is-active .library-tab-count { color:var(--gold-soft); background:var(--accent-surface); }
.library-catalog-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); align-items:stretch; gap:14px; }
.library-catalog-card { position:relative; display:flex; min-width:0; flex-direction:column; overflow:hidden; border:1px solid var(--line); border-radius:9px; background:var(--panel); content-visibility:auto; contain-intrinsic-size:auto 290px; transition:border-color .16s ease,background-color .16s ease; }
.library-catalog-card:hover { border-color:var(--accent-border); background:var(--panel-raised); }
.library-catalog-card:has(.library-catalog-link:focus-visible) { outline:2px solid var(--gold-soft); outline-offset:3px; }
.library-catalog-link { color:inherit; text-decoration:none; }
.library-catalog-link::after { position:absolute; z-index:1; inset:0; content:""; border-radius:inherit; }
.library-catalog-link:focus-visible { outline:none; }
.library-catalog-card:hover .library-catalog-link { color:var(--gold-soft); }
.library-catalog-media { position:relative; display:grid; aspect-ratio:2.08 / 1; place-items:center; overflow:hidden; background:var(--panel-raised); }
.library-catalog-media>img { display:block; width:100%; height:100%; object-fit:cover; filter:saturate(.72) brightness(.88); }
.library-catalog-mark { color:color-mix(in srgb, var(--gold) 52%, var(--panel-raised)); font:400 76px/1 var(--serif); }
.library-catalog-media:has(.library-catalog-mark) { background:radial-gradient(120% 90% at 30% 20%, color-mix(in srgb, var(--gold) 7%, var(--panel-raised)), var(--panel)); }
.library-catalog-mark svg { width:28px; height:28px; }
.library-catalog-save { position:absolute; z-index:2; top:10px; right:10px; display:grid; width:38px; height:38px; place-items:center; border:1px solid var(--line); border-radius:6px; color:var(--gold-soft); background:color-mix(in srgb,var(--panel) 85.10%,transparent); cursor:pointer; touch-action:manipulation; }
.library-catalog-save:hover,.library-catalog-save.is-saved { border-color:var(--gold); background:var(--accent-surface); }
.library-catalog-save.is-saved svg { fill:var(--gold); }
.library-catalog-save:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; }
.library-catalog-copy { display:flex; min-width:0; flex:1; flex-direction:column; align-items:stretch; gap:7px; padding:14px 15px 16px; }
.library-catalog-type { color:var(--muted); font-size:13px; line-height:1.35; }
.library-catalog-copy h2 { display:-webkit-box; min-width:0; margin:0; overflow:hidden; color:var(--ink); font:400 23px/1.08 var(--serif); text-wrap:balance; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.library-catalog-meta { min-height:18px; margin:0; color:var(--muted); font-size:13px; line-height:1.45; }
.library-page-catalog .library-more { margin:16px auto 0; }
@media(max-width:900px) {
  .library-catalog-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .library-page-catalog .library-add-button { width:260px; min-width:260px; }
}
@media(max-width:760px) {
  .library-page-catalog .library-heading { align-items:flex-start; flex-wrap:wrap; gap:12px; }
  .library-page-catalog .library-add-menu { margin-left:auto; }
}
@media(max-width:600px) {
  .library-page-catalog .library-intro .lede { font-size:15px; }
  .library-page-catalog .library-add-button { display:grid; grid-template-columns:1fr; width:42px; min-width:42px; max-width:42px; min-height:42px; padding:0; overflow:hidden; font-size:0; }
  .library-page-catalog .library-add-button > span,
  .library-page-catalog .library-add-button > svg { display:none; }
  .library-page-catalog .library-add-menu { max-width:100%; }
  .library-page-catalog .library-filters { grid-template-columns:1fr 1fr; }
  .library-catalog-grid { grid-template-columns:1fr; gap:10px; }
  .library-catalog-card { display:grid; grid-template-columns:minmax(110px,.72fr) minmax(0,1.28fr); min-height:148px; contain-intrinsic-size:auto 148px; }
  .library-catalog-media { min-height:100%; aspect-ratio:auto; }
  .library-catalog-copy { min-height:0; padding:11px; gap:5px; }
  .library-catalog-copy h2 { font-size:20px; }
}

.study-topic-overview-hero { display:grid; grid-template-columns:minmax(190px,.82fr) minmax(0,1.3fr) minmax(190px,.85fr); overflow:hidden; border:1px solid var(--line); border-radius:9px; background:var(--panel); }
.study-topic-page .learning-heading { grid-template-columns:1fr; }
.study-topic-overview-cover { min-height:220px; background:var(--panel-raised); }
.study-topic-overview-cover.is-empty { display:grid; place-items:center; color:var(--gold); background:linear-gradient(145deg,var(--panel-raised) 0%,var(--panel) 68%,var(--panel)); }
.study-topic-overview-cover.is-empty svg { width:56px; height:56px; opacity:.55; }
.study-topic-overview-cover img { display:block; width:100%; height:100%; min-height:220px; object-fit:cover; filter:saturate(.68) brightness(.85); }
.study-topic-overview-copy { display:flex; min-width:0; flex-direction:column; justify-content:center; gap:9px; padding:22px 24px; }
.study-topic-overview-copy>.learning-kicker,.study-topic-overview-copy>.learning-meta,.study-topic-overview-copy>p { margin:0; }
.study-topic-overview-copy>.learning-meta { color:var(--muted); font-size:12px; }
.study-topic-overview-copy>p:not(.learning-kicker):not(.learning-meta) { color:var(--muted); font-size:13px; line-height:1.55; }
.study-topic-overview-copy .study-feature-progress { margin-top:4px; }
.study-topic-overview-actions { display:flex; align-items:center; gap:9px; flex-wrap:wrap; }
.study-topic-overview-actions .btn { min-height:41px; padding:8px 13px; font-size:12px; }
.study-topic-exam { border-color:var(--accent-border); color:var(--gold); background:var(--panel); }
.study-topic-exam-passed { color:var(--green); font-size:12px; }
.study-topic-overview-aside { display:flex; flex-direction:column; gap:9px; padding:19px 18px; border-left:1px solid var(--line); background:var(--panel); }
.study-topic-overview-aside h2 { margin:0; font:400 23px/1.2 var(--serif); }
.study-topic-overview-aside p { margin:0; color:var(--muted); font-size:12px; line-height:1.55; }
.study-topic-overview-fact { padding-top:8px; border-top:1px solid var(--line); color:var(--gold); font-size:12px; }
.study-topic-tabs { display:flex; align-items:center; gap:24px; overflow:auto; border-bottom:1px solid var(--line); scrollbar-width:thin; }
.study-topic-tab { position:relative; min-height:43px; flex:none; padding:0 1px; border:0; color:var(--muted); background:transparent; font:13px var(--sans); cursor:pointer; }
.study-topic-tab:hover,.study-topic-tab.is-active { color:var(--gold-soft); }
.study-topic-tab.is-active::after { content:""; position:absolute; inset:auto 0 -1px; height:2px; background:var(--gold); }
.study-topic-tab-content { padding-top:5px; }
.study-topic-tab-content>h2 { margin:0 0 11px; font:400 26px/1.2 var(--serif); }
.study-topic-section-list,.study-topic-source-list,.study-topic-related-list { display:grid; gap:6px; }
.study-topic-section-row { display:grid; width:100%; grid-template-columns:32px minmax(0,1fr) auto; align-items:center; gap:12px; min-height:65px; padding:8px 13px; border:1px solid var(--line); border-radius:7px; color:inherit; background:var(--panel); font:inherit; text-align:left; cursor:pointer; }
.study-topic-section-row:hover { border-color:var(--accent-border); background:var(--panel-raised); }
.study-topic-section-row:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; }
.study-topic-section-number { color:var(--gold); font:400 19px var(--serif); text-align:center; }
.study-topic-section-copy { display:grid; min-width:0; gap:3px; }
.study-topic-section-copy strong { overflow:hidden; color:var(--ink); font:400 19px/1.2 var(--serif); text-overflow:ellipsis; white-space:nowrap; }
.study-topic-section-copy small { display:-webkit-box; overflow:hidden; color:var(--muted); font-size:12px; line-height:1.45; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.study-topic-section-state { color:var(--gold); font-size:12px; }
.study-topic-section-state.is-done { color:var(--green); }
.study-topic-description { max-width:78ch; color:var(--muted); line-height:1.7; }
.study-topic-source-row { display:flex; align-items:center; justify-content:space-between; gap:14px; min-height:58px; padding:9px 13px; border:1px solid var(--line); border-radius:7px; background:var(--panel); }
.study-topic-source-row>span { display:grid; min-width:0; gap:3px; }
.study-topic-source-row strong { overflow:hidden; color:var(--ink); font:400 17px/1.2 var(--serif); text-overflow:ellipsis; white-space:nowrap; }
.study-topic-source-row small { color:var(--muted); font-size:12px; }
.study-topic-source-link { flex:none; color:var(--muted); text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); font-size:12px; }
.study-topic-related-row { display:grid; gap:4px; padding:12px 14px; border:1px solid var(--line); border-radius:7px; color:var(--ink); background:var(--panel); text-align:left; cursor:pointer; }
.study-topic-related-row:hover { border-color:var(--accent-border); }
.study-topic-related-row strong { font:400 18px/1.2 var(--serif); }
.study-topic-related-row small { color:var(--muted); font-size:12px; }
@media(max-width:980px) { .study-topic-overview-hero { grid-template-columns:minmax(180px,.8fr) minmax(0,1.2fr); } .study-topic-overview-aside { grid-column:1/-1; border-top:1px solid var(--line); border-left:0; } }
@media(max-width:600px) { .study-topic-overview-hero { grid-template-columns:1fr; } .study-topic-overview-cover,.study-topic-overview-cover img { min-height:170px; height:170px; } .study-topic-overview-copy { padding:17px; } .study-topic-overview-aside { grid-column:auto; } .study-topic-tabs { gap:17px; } .study-topic-section-row { grid-template-columns:25px minmax(0,1fr); gap:8px; } .study-topic-section-state { grid-column:2; } .study-topic-source-row { align-items:flex-start; flex-direction:column; } }

.study-topic-control { display:grid; gap:8px; width:min(100%,360px); min-width:0; }
.study-topic-control .learning-select { width:100%; min-width:0; }

/* Constellation: light belongs to the events, the surrounding interface stays quiet. */
.kg-canvas { background:var(--ground); min-height:580px; isolation:isolate; }
.kg-canvas .sigma-stage { z-index:1; }
.kg-canvas .kg-starlight { position:absolute; inset:0; width:100%; height:100%; z-index:100; pointer-events:none; }
.kg-label-targets { position:absolute; inset:0; z-index:101; overflow:hidden; pointer-events:none; }
.kg-label-hit { position:absolute; overflow:hidden; padding:0; border:0; background:transparent; color:var(--muted); font:12px/1 Onest,sans-serif; text-align:left; white-space:nowrap; text-shadow:0 1px 5px var(--ground),0 0 2px var(--ground); cursor:pointer; pointer-events:auto; user-select:none; }
.kg-label-hit:hover { color:var(--ink); }
.kg-label-hit:focus-visible { outline:1px solid var(--gold-soft); outline-offset:2px; border-radius:2px; }
.kg-cluster-label { position:absolute; z-index:3; transform:translate(-50%,-100%); max-width:min(80%,360px); padding:5px 10px; border:1px solid color-mix(in srgb, var(--gold) 50%, transparent); border-radius:999px; background:color-mix(in srgb,var(--panel) 86.67%,transparent); color:var(--gold-soft); font:500 12px/1.2 Onest,sans-serif; letter-spacing:.01em; pointer-events:none; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; box-shadow:0 3px 16px #0008; }
.kg-cluster-label[hidden] { display:none; }
.kg-layout { background:var(--ground); min-height:580px; }
.kg-layout.is-fallback { background:var(--panel); }
.kg-groups { position:absolute; inset:0; width:100%; height:100%; z-index:0; pointer-events:none; }
.kg-index { background:var(--panel); }
.kg-event>i { box-shadow:0 0 8px color-mix(in srgb,var(--kg-topic),transparent 30%); }
.kg-event.is-selected { background:var(--panel-raised); }
.kg-toolbar { background:var(--panel); }
.kg-status { background:var(--panel); }
.kg-topic-label { display:grid; gap:5px; min-width:180px; color:var(--muted); font-size:12px; }
.kg-topic-select { min-height:38px; padding:7px 30px 7px 10px; border:1px solid var(--line); border-radius:5px; background:var(--ground); color:var(--ink); }
.kg-topic-select:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; }
.kg-toolbar .kg-topic-label { margin-right:auto; }
.kg-toolbar .kg-topic-label[hidden] { display:none; }
.kg-canvas .sigma-stage { touch-action:none; }
.kg-canvas { touch-action:none; overscroll-behavior:contain; }
.kg-canvas.is-panning { cursor:grabbing; }
.kg-canvas.is-3d { cursor:grab; }
.kg-canvas.is-3d.is-orbiting { cursor:grabbing; }
.kg-canvas:focus-visible { outline:1px solid color-mix(in srgb,var(--gold) 58%,transparent); outline-offset:-2px; }
@media(max-width:780px) { .kg-canvas { min-height:460px; } }
@media(max-width:460px) { .kg-canvas { min-height:380px; } }

.study-detail.is-graph-preview { display:grid; grid-template-columns:minmax(0,1fr); align-items:start; gap:8px; padding:24px 28px; }
.study-detail.is-graph-preview .learning-kicker,.study-detail.is-graph-preview h2,.study-graph-preview-meta { grid-column:1/-1; margin:0; }
.study-detail.is-graph-preview h2 { font-size:27px; }
.study-graph-preview-meta { color:var(--learn-muted); font-size:13px; }
.study-graph-preview-description,.study-graph-preview-related { grid-column:1/-1; min-width:0; margin:0; }
.study-graph-preview-description { max-width:70ch; color:var(--muted); font-size:15px; line-height:1.55; }
.study-graph-preview-related { color:var(--learn-muted); font-size:13px; line-height:1.45; }
.study-graph-preview-action { justify-self:start; margin-top:10px; white-space:nowrap; }
@media(max-width:600px) { .study-detail.is-graph-preview { grid-template-columns:1fr; gap:10px; padding:17px; }.study-graph-preview-action { justify-self:stretch; justify-content:center; } }

/* The knowledge map uses the available viewport as its workspace. */
body.is-graphing .main { height:calc(calc(100dvh / var(--ui-zoom, 1)) - var(--header-height)); overflow-y:auto; padding-top:10px; padding-bottom:12px; }
body.is-graphing .main-inner { height:100%; max-width:none; }
.study-graph-page { display:flex; flex-direction:column; gap:8px; height:100%; min-height:calc(calc(100dvh / var(--ui-zoom, 1)) - var(--header-height) - 22px); }
.study-graph-heading { display:flex; flex:0 0 auto; align-items:center; justify-content:space-between; min-height:42px; margin:0; }
.study-graph-heading .learning-intro { display:flex; align-items:center; gap:18px; max-width:none; }
.study-graph-heading h1 { margin:0; font:400 29px/1.1 var(--serif); letter-spacing:-.015em; }
.study-graph-heading .learning-back { flex:none; margin:0; color:var(--muted); font-size:13px; }
/* «Все / Изученные» on the library map and timeline reuses the study filter chips. */
.study-scope-toggle { display:inline-flex; flex:none; flex-wrap:nowrap; gap:2px; margin:0; padding:3px; border:1px solid var(--learn-line); border-radius:999px; }
.study-scope-toggle .study-my-topic-filter { padding:6px 14px; border:0; border-radius:999px; line-height:1.2; }
.study-scope-toggle .study-my-topic-filter.is-active { color:var(--gold-soft); background:var(--panel-raised); }
.study-scope-toggle .study-my-topic-filter:hover:not(.is-active) { color:var(--learn-ink); background:transparent; }
/* Align the switch with the serif title's baseline, not its box centre. */
.study-graph-heading .learning-intro:has(> .study-scope-toggle) { align-items:baseline; }
.learning-intro > .study-scope-toggle:not(:first-child) { margin-top:12px; }
.study-graph-heading .learning-intro > .study-scope-toggle { margin-top:0; }
.study-scope-empty { display:grid; justify-items:center; gap:10px; margin:auto; padding:40px 20px; text-align:center; }
.study-scope-empty h2 { margin:0; color:var(--learn-ink); font:400 24px/1.2 var(--serif); }
.study-scope-empty p { max-width:44ch; margin:0; color:var(--learn-muted); }
.study-graph-section { display:flex; flex:1 0 auto; min-height:0; margin:0; }
.study-graph-section .learning-graph { display:flex; flex:1; flex-direction:column; min-height:0; border:0; border-radius:0; background:var(--ground); }
.study-graph-section .kg-toolbar { flex:0 0 auto; align-items:center; gap:8px; padding:7px 10px; border-bottom:1px solid var(--line); background:var(--ground); }
.study-graph-section .kg-topic-label { display:flex; align-items:center; gap:8px; min-width:240px; }
.study-graph-section .kg-topic-label select { min-width:0; flex:1; }
.study-graph-section .kg-search-label { display:flex; align-items:center; gap:8px; flex:1 1 260px; min-width:240px; }
.study-graph-section .kg-search-label input { min-width:0; flex:1; }
.study-graph-section .kg-topic-select,.study-graph-section .kg-search,.study-graph-section .kg-toolbar button { min-height:34px; }
.study-graph-section .kg-layout { flex:1; min-height:0; }
.study-graph-section .kg-canvas { height:100%; min-height:430px; background:var(--ground); }
.study-graph-section .kg-status { flex:0 0 auto; min-height:0; padding:0; border:0; background:var(--ground); }
.study-graph-section .kg-status:not(:empty) { min-height:26px; padding:5px 10px; border-top:1px solid var(--line); }
.study-detail.is-graph-preview { max-width:960px; margin:18px 0 28px; border-radius:8px; }
.study-graph-relations,.study-graph-sources { max-width:860px; }
.study-relation-type { margin:0; color:var(--muted); font-size:12px; letter-spacing:.025em; }
.study-detail.is-graph-preview .study-graph-sources,.study-detail.is-graph-preview .study-graph-relations { grid-column:1/-1; gap:10px; margin-top:22px; }
.study-detail.is-graph-preview .study-graph-sources .study-source-list { display:flex; flex-wrap:wrap; gap:6px 20px; margin:0; padding:0; list-style:none; }
.study-detail.is-graph-preview .study-graph-sources h3,.study-detail.is-graph-preview .study-graph-relations>h3 { font-size:20px; }
.study-relation-direction { margin:0; color:var(--muted); font-size:12px; line-height:1.45; overflow-wrap:anywhere; }
.study-source-locator { color:var(--muted); font-size:12px; }
@media(max-width:760px) {
  body.is-graphing .main { height:auto; min-height:calc(calc(100dvh / var(--ui-zoom, 1)) - var(--header-height)); padding:9px 8px calc(94px + env(safe-area-inset-bottom)); }
  body.is-graphing .main-inner { height:auto; }
  .study-graph-page { height:auto; min-height:calc(calc(100dvh / var(--ui-zoom, 1)) - var(--header-height) - 100px); }
  .study-graph-heading { min-height:38px; }
  .study-graph-heading .learning-intro { gap:11px; }
  .study-graph-heading h1 { font-size:25px; }
  .study-graph-heading .learning-back { font-size:12px; }
  .study-graph-section { flex:0 0 auto; }
  .study-graph-section .learning-graph { min-height:0; }
  .study-graph-section .kg-toolbar { display:grid; grid-template-columns:minmax(0,1fr) auto auto; }
  .study-graph-section .kg-topic-label { display:grid; grid-column:1; min-width:0; }
  .study-graph-section .kg-search-label { display:grid; grid-column:1/3; grid-row:2; min-width:0; }
  .study-graph-section .kg-toolbar .kg-filter { grid-column:2; grid-row:1; }
  .study-graph-section .kg-toolbar .kg-3d-toggle { grid-column:3; grid-row:1; }
  .study-graph-section .kg-toolbar .kg-fit { grid-column:3; grid-row:2; }
  .study-graph-section .kg-layout { flex:1; min-height:0; }
  .study-graph-section .kg-canvas { min-height:max(320px,calc(42dvh / var(--ui-zoom, 1))); }
}
@media(prefers-reduced-motion:reduce) {
  .study-graph-page *, .study-graph-page *::before, .study-graph-page *::after { scroll-behavior:auto; }
}

/* Keep prose calm and readable while links remain clearly identifiable. */
.learning-page p { text-wrap:pretty; }
.learning-page .lede { max-width:64ch; line-height:1.65; }
.learning-page .learning-meta { color:var(--muted); }
.study-dashboard { display:grid; gap:22px; }
.study-dashboard-head { display:flex; align-items:end; justify-content:space-between; gap:20px; margin-bottom:4px; }
.study-dashboard-head h1 { margin:0 0 7px; font:400 48px/1.05 var(--serif); }
.study-dashboard-head .learning-kicker { margin:0 0 10px; }
.study-feature { display:flex; align-items:center; justify-content:space-between; gap:24px; max-width:none; padding:22px 26px; }
.study-feature h2 { font-size:30px; }
.study-feature>div>p { margin:5px 0; }
.study-feature .btn { flex:none; }
.study-dashboard .study-tools { max-width:none; margin:0; }
.study-dashboard .study-tool-card { min-height:0; padding:16px 19px; }
.study-dashboard .study-tool-card h3 { font-size:21px; }
.study-section.study-recent,.study-section.study-explore { max-width:none; margin:25px 0; }
.study-topic-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; }
.study-topic-row { display:grid; grid-template-columns:minmax(0,1fr) auto 18px; align-items:center; gap:14px; padding:13px 15px; text-align:left; color:var(--learn-ink); border:1px solid var(--learn-line); border-radius:8px; background:var(--panel); }
.study-topic-row:hover { border-color:var(--accent-border); background:var(--panel); }
.study-topic-row span { color:var(--learn-muted); font-size:13px; }
.study-topic-row .study-topic-arrow { color:var(--learn-bronze); }
.study-explore { display:flex; align-items:center; justify-content:space-between; border-top:1px solid var(--learn-line); padding-top:18px; }
.study-explore h2,.study-explore p { margin:0; }
@media(max-width:600px){.study-dashboard-head,.study-feature,.study-explore{align-items:stretch;flex-direction:column}.study-topic-list{grid-template-columns:1fr}.study-topic-row{grid-template-columns:1fr auto}.study-topic-arrow{display:none}}

/* Editorial study home: reading position first, discovery and knowledge check below. */
.study-page .study-dashboard-head { margin-bottom:8px; }
.study-page .study-dashboard-head .lede { max-width:70ch; margin:0; }
.study-page .study-feature { display:grid; grid-template-columns:minmax(0,1fr) 220px; align-items:center; gap:38px; padding:27px 32px 25px; }
.study-feature-copy { min-width:0; }
.study-feature .study-feature-copy h2 { margin:12px 0 7px; font-size:36px; }
.study-feature-copy>.learning-meta { margin-bottom:18px; }
.study-resume-fragment { display:grid; gap:4px; margin:17px 0 17px; padding-left:13px; border-left:2px solid var(--learn-bronze); }
.study-resume-fragment span { color:var(--ink); font-size:13px; }
.study-resume-fragment strong { color:var(--learn-ink); font-size:14px; font-weight:550; }
.study-resume-fragment small { display:-webkit-box; overflow:hidden; color:var(--learn-muted); font-size:12px; line-height:1.45; -webkit-box-orient:vertical; -webkit-line-clamp:1; }
.study-feature-progress { display:grid; grid-template-columns:auto minmax(80px,1fr) auto; align-items:center; gap:13px; margin-top:22px; color:var(--learn-muted); font-size:12px; }
.study-feature-progress small { white-space:nowrap; font-size:12px; }
.study-progress-track { height:4px; margin:0; background:var(--neutral); }
.study-feature-actions { display:grid; gap:12px; justify-items:stretch; }
.study-feature-actions .btn { justify-content:center; text-align:center; white-space:nowrap; }
.study-outline-link { min-height:40px; padding:9px 13px; border:1px solid var(--learn-line); border-radius:7px; color:var(--learn-muted); background:transparent; }
.study-outline-link:hover { border-color:var(--accent-border); color:var(--gold-soft); }
.study-other-topics { display:grid; grid-template-columns:minmax(0,1fr) 285px; align-items:start; gap:38px; margin:32px 0 40px; }
.study-other-topics.is-wide { grid-template-columns:1fr; }
.study-other-topics.is-exam-only { grid-template-columns:minmax(0,1fr); }
.study-other-topics.is-exam-only .study-exam-card { max-width:540px; }
.study-started-column { min-width:0; }
.study-started-column .study-section-heading { margin-bottom:12px; }
.study-started-column .study-section-heading h2,.study-discover .study-section-heading h2 { font-size:26px; }
.study-topic-list { display:grid; grid-template-columns:1fr; gap:0; border-top:1px solid var(--learn-line); }
.study-topic-row { grid-template-columns:minmax(0,1fr) 62px 22px; gap:12px; padding:14px 4px; border:0; border-bottom:1px solid var(--line); border-radius:0; background:transparent; }
.study-topic-row:hover { border-color:var(--line); background:var(--panel); }
.study-topic-copy { display:grid; gap:5px; }
.study-topic-copy strong { color:var(--learn-ink); font:400 19px/1.25 var(--serif); }
.study-topic-copy small { overflow:hidden; color:var(--learn-muted); font-size:12px; text-overflow:ellipsis; white-space:nowrap; }
.study-topic-row .study-topic-percent { text-align:right; font-variant-numeric:tabular-nums; }
.study-exam-card { display:grid; gap:11px; padding:22px 20px; border:1px solid var(--accent-border); border-radius:9px; background:var(--panel); }
.study-exam-card .learning-kicker { margin:0; font-size:12px; }
.study-exam-card h3 { margin:0; color:var(--learn-ink); font:400 24px/1.2 var(--serif); }
.study-exam-card>p:not(.learning-kicker) { margin:0 0 6px; color:var(--learn-muted); font-size:13px; line-height:1.5; }
.study-exam-action { min-height:42px; padding:10px 13px; border:1px solid var(--accent-border); border-radius:6px; color:var(--gold); background:transparent; }
.study-exam-action:hover:not(:disabled) { color:var(--on-accent); background:var(--gold); }
.study-exam-action:disabled { cursor:not-allowed; opacity:.65; }
.study-exam-actions { display:grid; gap:8px; }
.study-discover { margin:0 0 28px; padding-top:25px; border-top:1px solid var(--learn-line); }
.study-discover .study-section-heading { margin-bottom:7px; }
.study-recommendations { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:24px; }
.study-recommendation { display:grid; grid-template-columns:24px minmax(0,1fr) 18px; align-items:start; gap:12px; padding:15px 0; border:0; border-top:1px solid var(--neutral); text-align:left; color:var(--learn-ink); background:transparent; }
.study-recommendation:hover strong,.study-recommendation:hover .study-recommendation-copy>span { color:var(--gold-soft); }
.study-recommendation-number { color:var(--learn-bronze); font:15px var(--serif); }
.study-recommendation-copy { display:grid; gap:6px; }
.study-recommendation-copy strong { font:400 19px/1.25 var(--serif); }
.study-recommendation-copy small { color:var(--learn-muted); font-size:12px; line-height:1.45; }
.study-recommendation-copy>span { color:var(--learn-bronze); font-size:12px; }
.study-recommendation>span:last-child { color:var(--learn-bronze); }
.study-catalog-shortcut { position:relative; display:flex; align-items:center; gap:12px; margin-top:12px; padding:11px 14px 11px 18px; border:1px solid var(--learn-line); border-radius:8px; background:var(--panel); }
.study-catalog-shortcut>strong { flex:none; font:400 16px var(--serif); }
.study-catalog-shortcut>input { flex:1; min-width:100px; min-height:39px; padding:8px 11px; border:0; outline:0; color:var(--learn-ink); background:transparent; font:13px var(--sans); }
.study-catalog-shortcut>input::placeholder { color:var(--learn-muted); opacity:1; }
.study-catalog-shortcut>.study-exam-action { flex:none; min-height:38px; padding:8px 12px; font-size:12px; }
.study-catalog-results { position:absolute; z-index:2; top:calc(100% + 5px); right:0; left:0; display:flex; flex-wrap:wrap; gap:6px; padding:9px; border:1px solid var(--learn-line); border-radius:8px; background:var(--panel); box-shadow:0 12px 28px #0007; }
.study-catalog-results[hidden] { display:none; }
.study-catalog-result { padding:7px 10px; border:1px solid var(--learn-line); border-radius:20px; color:var(--learn-muted); background:var(--panel); font-size:12px; }
.study-catalog-result:hover { border-color:var(--accent-border); color:var(--gold-soft); }
.study-footnote { margin:14px 0 0; color:var(--learn-muted); font-size:12px; }
@media(max-width:900px) { .study-page .study-feature { grid-template-columns:1fr; gap:20px; }.study-feature-actions { grid-template-columns:1fr 1fr; }.study-other-topics { grid-template-columns:1fr; gap:20px; }.study-exam-card { max-width:none; } }
@media(max-width:600px) { .study-feature-progress { grid-template-columns:auto minmax(50px,1fr); }.study-feature-progress small { grid-column:1/-1; }.study-feature-actions { grid-template-columns:1fr; }.study-recommendations { grid-template-columns:1fr; gap:4px; }.study-catalog-shortcut { display:grid; grid-template-columns:1fr auto; }.study-catalog-shortcut>strong { grid-column:1/-1; }.study-catalog-shortcut>input { grid-column:1/-1; padding-left:0; }.study-catalog-shortcut>.study-exam-action { justify-self:stretch; } }

/* Study home composition from the approved dashboard reference. */
.study-page .study-dashboard { gap:24px; }
.study-page .study-dashboard-head { display:grid; grid-template-columns:minmax(0,1fr) minmax(380px,590px); align-items:end; gap:26px; margin:0 0 2px; }
.study-dashboard-intro h1 { margin:0 0 4px; color:var(--learn-ink); font:400 clamp(46px,4.4vw,60px)/1.05 var(--serif); letter-spacing:-.025em; }
.study-dashboard-intro .lede { max-width:58ch; margin:0; color:var(--learn-muted); font-size:16px; }
.study-dashboard-tools { position:relative; display:grid; grid-template-columns:minmax(0,1fr); align-content:start; gap:7px; }
.study-dashboard-action { display:inline-flex; min-height:44px; align-items:center; justify-content:center; padding:0 13px; color:var(--on-accent); border:1px solid var(--accent-border); border-radius:7px; background:var(--gold); font:13px var(--sans); white-space:nowrap; cursor:pointer; }
.study-dashboard-action:hover { background:var(--gold); }
.study-page .study-feature { display:grid; grid-template-columns:clamp(230px,24vw,330px) minmax(0,1fr) clamp(260px,24vw,385px); align-items:stretch; gap:0; overflow:hidden; padding:0; border-color:var(--line); border-radius:11px; background:linear-gradient(115deg,var(--panel),var(--panel)); }
.study-feature-art { min-height:254px; overflow:hidden; background:var(--panel-raised); }
.study-feature-art img { display:block; width:100%; height:100%; min-height:254px; object-fit:cover; }
.study-feature-copy { align-self:center; padding:24px 28px; }
.study-feature-copy .learning-kicker { margin:0 0 12px; }
.study-feature .study-feature-copy h2 { margin:0 0 5px; color:var(--learn-ink); font-size:34px; line-height:1.1; }
.study-feature-copy>.learning-meta { margin:0 0 12px; font-size:13px; }
.study-feature-description { max-width:65ch; margin:0; color:var(--muted); font-size:14px; line-height:1.55; }
.study-resume-fragment { margin:14px 0 0; }
.study-feature-progress { margin-top:16px; }
.study-feature-actions { align-content:center; justify-items:stretch; gap:9px; padding:22px clamp(18px,2.4vw,38px); border-left:1px solid var(--line); background:var(--panel); }
.study-feature-actions .btn.primary { min-height:46px; color:var(--on-accent); border:1px solid var(--accent-border); background:var(--gold); font-size:13px; }
.study-feature-actions .study-outline-link { justify-content:center; }
.study-other-topics { grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr); gap:38px; margin:8px 0 24px; }
.study-started-column .study-section-heading { margin-bottom:10px; }
.study-started-column .study-section-heading h2,.study-exam-column>h2 { margin:0; color:var(--learn-ink); font:400 26px/1.15 var(--serif); }
.study-topic-list { border-top:1px solid var(--learn-line); }
.study-topic-row { display:grid; grid-template-columns:66px minmax(0,1fr) minmax(56px,92px) 36px auto; align-items:center; gap:12px; min-height:70px; padding:8px 2px; border-bottom:1px solid var(--line); }
.study-topic-thumb { width:66px; height:54px; object-fit:cover; border-radius:5px; background:var(--panel-raised); }
.study-topic-copy strong { font-size:18px; }
.study-topic-copy small { font-size:12px; }
.study-topic-progress-track { display:block; height:4px; overflow:hidden; border-radius:3px; background:var(--neutral); }
.study-topic-progress-track i { display:block; height:100%; border-radius:inherit; background:var(--learn-bronze); }
.study-topic-action { min-height:36px; padding:7px 12px; color:var(--learn-ink); border:1px solid var(--learn-line); border-radius:6px; background:var(--panel); font:12px var(--sans); white-space:nowrap; cursor:pointer; }
.study-topic-action:hover { border-color:var(--accent-border); color:var(--gold-soft); }
.study-dashboard-empty { display:grid; gap:10px; padding:15px 0; color:var(--learn-muted); font-size:13px; line-height:1.5; }
.study-dashboard-empty p { margin:0; }
.study-exam-column { min-width:0; }
.study-exam-heading { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:10px; }
.study-exam-heading>h2 { margin:0; color:var(--learn-ink); font:400 26px/1.15 var(--serif); }
.study-exam-list { display:grid; border-top:1px solid var(--learn-line); }
.study-exam-card { display:grid; grid-template-columns:52px minmax(0,1fr) auto; align-items:center; gap:12px; padding:10px 0; border:0; border-bottom:1px solid var(--line); border-radius:0; background:transparent; }
.study-exam-thumb { width:52px; height:48px; object-fit:cover; border-radius:5px; background:var(--panel-raised); }
.study-exam-copy { display:grid; min-width:0; gap:5px; }
.study-exam-copy strong { min-width:0; overflow:visible; color:var(--learn-ink); font:400 17px/1.2 var(--serif); text-overflow:clip; white-space:normal; overflow-wrap:break-word; }
.study-exam-copy small { color:var(--learn-muted); font-size:12px; }
.study-exam-actions { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:6px; }
.study-exam-action,.study-exam-retry { min-height:34px; padding:7px 10px; border-color:var(--accent-border); border-radius:6px; font-size:12px; white-space:nowrap; }
.study-exam-retry { color:var(--learn-muted); border:1px solid var(--learn-line); background:transparent; }
.study-exam-retry:hover { color:var(--learn-ink); border-color:var(--accent-border); }
.study-discover { margin:0 0 20px; padding-top:20px; }
.study-recommendation-head { display:flex; align-items:center; justify-content:space-between; gap:16px; margin-bottom:11px; }
.study-recommendation-head h2 { margin:0; font:400 26px/1.15 var(--serif); }
.study-recommendation-tabs { display:flex; align-items:center; gap:20px; }
.study-recommendation-tab { padding:7px 2px; color:var(--learn-muted); border:0; border-bottom:1px solid transparent; background:transparent; font:12px var(--sans); cursor:pointer; }
.study-recommendation-tab.is-active { color:var(--gold); border-bottom-color:var(--gold); }
.study-recommendations { grid-template-columns:repeat(3,minmax(0,1fr)); gap:13px; }
.study-recommendation { grid-template-columns:112px minmax(0,1fr); align-items:center; gap:13px; padding:0; overflow:hidden; border:1px solid var(--learn-line); border-radius:8px; background:var(--panel); }
.study-recommendation:hover { border-color:var(--accent-border); background:var(--panel-raised); }
.study-recommendation-art { display:block; width:112px; height:90px; object-fit:cover; background:var(--panel-raised); }
.study-recommendation-copy { padding:10px 10px 10px 0; }
.study-recommendation-copy strong { font-size:16px; }
.study-recommendation-copy small { display:-webkit-box; overflow:hidden; font-size:12px; line-height:1.35; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.study-recommendation-copy>span { font-size:12px; }
.study-footnote { padding-top:8px; border-top:1px solid var(--learn-line); }

@media(max-width:1100px) {
  .study-page .study-feature { grid-template-columns:210px minmax(0,1fr) 220px; }
  .study-feature-copy { padding:20px; }
  .study-feature .study-feature-copy h2 { font-size:29px; }
  .study-other-topics { gap:24px; }
  .study-recommendations { grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media(max-width:760px) {
  .study-dashboard-intro h1 { font-size:44px; }
  .study-dashboard-intro .lede { font-size:14px; }
  .study-dashboard-action { padding:0 9px; font-size:12px; }
  .study-page .study-feature { grid-template-columns:1fr; }
  .study-feature-art,.study-feature-art img { min-height:180px; max-height:210px; }
  .study-feature-copy { padding:20px 18px 14px; }
  .study-feature .study-feature-copy h2 { font-size:29px; }
  .study-feature-actions { grid-template-columns:1fr 1fr; padding:12px 18px 18px; border-top:1px solid var(--line); border-left:0; }
  .study-feature-actions .btn.primary { white-space:normal; }
  .study-feature-progress { grid-template-columns:auto minmax(40px,1fr); }
  .study-feature-progress small { grid-column:1/-1; }
  .study-other-topics { grid-template-columns:1fr; gap:22px; margin-top:4px; }
  .study-started-column .study-section-heading h2,.study-exam-column>h2,.study-discover .study-section-heading h2 { font-size:23px; }
  .study-topic-row { grid-template-columns:58px minmax(0,1fr) 34px; gap:9px; padding:9px 0; }
  .study-topic-thumb { width:58px; height:50px; }
  .study-topic-copy strong { font-size:16px; }
  .study-topic-progress-track,.study-topic-percent { display:none; }
  .study-topic-action { padding:7px 8px; font-size:12px; }
  .study-exam-card { grid-template-columns:48px minmax(0,1fr); gap:9px; }
  .study-exam-thumb { width:48px; height:46px; }
  .study-exam-actions { grid-column:2; justify-content:flex-start; }
  .study-recommendations { grid-template-columns:1fr; gap:8px; }
  .study-recommendation { grid-template-columns:100px minmax(0,1fr); }
  .study-recommendation-art { width:100px; height:78px; }
}

/* The reader is a separate book-like mode with a quiet table of contents. */
.study-reader { width:min(100%,1120px); margin:0 auto 42px; }
.study-reader-head { display:flex; align-items:end; justify-content:space-between; gap:25px; margin:0 0 28px; padding-bottom:23px; border-bottom:1px solid var(--learn-line); }
.study-reader-head h2 { margin:4px 0 8px; font:400 clamp(32px,4vw,48px)/1.12 var(--serif); }
.study-reader-head>.learning-meta { max-width:72ch; margin:0; }
.study-reader-controls { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:8px; }
.study-reader-layout { display:grid; grid-template-columns:210px minmax(0,720px); justify-content:center; align-items:start; gap:58px; }
.study-reader-toc { position:sticky; top:96px; max-height:calc(calc(100vh / var(--ui-zoom, 1)) - 118px); overflow:auto; padding:2px 0; }
.study-reader-toc>summary { padding:6px 0 12px; color:var(--learn-muted); cursor:pointer; font-size:12px; letter-spacing:.1em; text-transform:uppercase; }
.study-reader-toc-list { display:grid; gap:2px; padding-left:10px; border-left:1px solid var(--learn-line); }
.study-reader-toc-item { display:grid; gap:4px; padding:9px 8px; border:0; border-left:2px solid transparent; margin-left:-11px; text-align:left; color:var(--learn-ink); background:transparent; }
.study-reader-toc-item:hover,.study-reader-toc-item[aria-current="location"] { border-left-color:var(--learn-bronze); background:var(--panel); }
.study-reader-toc-date { color:var(--learn-muted); font-size:12px; }
.study-reader-toc-title { font-size:13px; line-height:1.4; }
.study-reader-book { min-width:0; }
.study-reader-book-title { margin:0 0 46px; }
.study-reader-book-title h1 { margin:5px 0 7px; color:var(--learn-ink); font:400 clamp(38px,5vw,56px)/1.08 var(--serif); text-wrap:balance; }
.study-reader-book-title .learning-meta { margin:0; }
.study-reader-chapter { scroll-margin-top:30px; padding:0 0 48px; margin:0 0 42px; border-bottom:1px solid var(--line); }
.study-reader-date { margin:0 0 12px; color:var(--learn-bronze); font-size:13px; }
.study-reader-chapter h2 { margin:0 0 22px; font:400 clamp(27px,3.3vw,36px)/1.22 var(--serif); text-wrap:balance; }
.study-reader-paragraph { max-width:68ch; margin:0 0 1.15em; color:var(--ink); font:400 18px/1.82 var(--serif); text-wrap:pretty; }
.study-reader-paragraph:last-of-type { margin-bottom:20px; }
.study-reader-sources,.study-reader-context { display:grid; gap:8px; max-width:68ch; margin:25px 0 0; padding-left:14px; border-left:1px solid color-mix(in srgb, var(--muted) 40%, var(--ground)); }
.study-reader-sources>span,.study-reader-context>span { color:var(--learn-muted); font-size:12px; }
.study-reader-sources a { width:fit-content; color:var(--muted); font-size:13px; text-decoration:underline; text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); text-underline-offset:3px; overflow-wrap:anywhere; }
.study-reader-context>p { margin:0; color:var(--learn-muted); font-size:13px; line-height:1.55; }
.study-reader-relation { width:fit-content; padding:0; border:0; color:var(--learn-ink); background:transparent; font:400 18px var(--serif); text-align:left; text-decoration:underline; text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); text-underline-offset:3px; }
.study-reader-chapter-footer { display:flex; justify-content:space-between; gap:12px; margin-top:30px; }
.study-reader-page-link { padding:8px 0; border:0; color:var(--learn-bronze); background:transparent; font-size:13px; }
.study-my-topics { max-width:890px; margin:0 auto; }
.study-my-topics h2 { margin:5px 0 8px; font:400 38px/1.15 var(--serif); }
.study-my-topics>.learning-meta { margin-bottom:25px; }
.study-my-topic-filters { display:flex; flex-wrap:wrap; gap:7px; margin:0 0 18px; }
.study-my-topic-filter { padding:8px 12px; border:1px solid var(--learn-line); border-radius:20px; color:var(--learn-muted); background:transparent; font-size:12px; }
.study-my-topic-filter:hover,.study-my-topic-filter.is-active { border-color:var(--accent-border); color:var(--gold-soft); background:var(--panel); }
.study-my-topic-list { display:grid; border-top:1px solid var(--learn-line); }
.study-my-topic { display:grid; grid-template-columns:minmax(0,1fr) 140px 48px 20px; align-items:center; gap:18px; padding:17px 5px; border:0; border-bottom:1px solid var(--learn-line); text-align:left; color:var(--learn-ink); background:transparent; }
.study-my-topic:hover { background:var(--panel); }
.study-my-topic>span:first-child { display:grid; gap:5px; }
.study-my-topic strong { font:400 20px var(--serif); }
.study-my-topic small { color:var(--learn-muted); font-size:12px; }
.study-my-topic-progress { height:4px; overflow:hidden; background:var(--neutral); }
.study-my-topic-progress i { display:block; height:100%; background:var(--learn-bronze); }
.study-my-topic-percent { color:var(--learn-muted); font-size:12px; font-variant-numeric:tabular-nums; text-align:right; }
body.is-reading .sidebar-quote { opacity:.72; }
body.is-reading .sidebar-bust { opacity:.55; }
@media(max-width:900px) { .study-reader-layout { grid-template-columns:1fr; gap:18px; }.study-reader-toc { position:relative; top:auto; max-height:calc(40vh / var(--ui-zoom, 1)); padding:10px 0; border-bottom:1px solid var(--learn-line); }.study-reader-head { align-items:flex-start; flex-direction:column; }.study-reader-controls { justify-content:flex-start; } }
@media(max-width:600px) { .study-reader { margin-top:0; }.study-reader-layout { gap:12px; }.study-reader-book-title { margin-bottom:32px; }.study-reader-paragraph { font-size:17px; line-height:1.75; }.study-reader-chapter { padding-bottom:34px; margin-bottom:32px; }.study-my-topic { grid-template-columns:minmax(0,1fr) 42px 18px; gap:11px; }.study-my-topic-progress { display:none; } }

/* The study dashboard's feature pairs a real topic cover with its live outline. */
.study-page .study-feature {
  position:relative;
  grid-template-columns:minmax(0,1.55fr) minmax(235px,.82fr);
  min-height:286px;
  gap:0;
}
.study-page .study-feature-art {
  position:absolute;
  z-index:0;
  inset:0 35% 0 0;
  min-height:0;
  background:var(--panel-raised);
}
.study-page .study-feature-art::after {
  position:absolute;
  inset:0;
  content:"";
  background:linear-gradient(90deg,color-mix(in srgb, var(--ground) 30%, transparent),color-mix(in srgb, var(--ground) 72%, transparent) 72%,var(--panel) 100%);
}
.study-page .study-feature-art img {
  min-height:100%;
  filter:saturate(.68) brightness(.74);
}
.study-page .study-feature-copy {
  position:relative;
  z-index:1;
  display:flex;
  grid-column:1;
  flex-direction:column;
  justify-content:center;
  align-self:stretch;
  padding:27px 30px;
  background:linear-gradient(90deg,color-mix(in srgb, var(--ground) 38%, transparent),color-mix(in srgb, var(--ground) 72%, transparent) 75%,var(--panel) 100%);
}
.study-page .study-feature-copy h2 { max-width:16ch; text-wrap:balance; }
.study-page .study-feature-copy>.learning-meta { max-width:44ch; }
.study-page .study-feature-copy .study-feature-actions {
  display:flex;
  flex-wrap:wrap;
  align-content:initial;
  justify-items:initial;
  gap:9px;
  margin-top:18px;
  padding:0;
  border:0;
  background:transparent;
}
.study-page .study-feature-copy .study-feature-actions .btn { width:auto; }
.study-page .study-feature-outline {
  position:relative;
  z-index:1;
  display:grid;
  grid-column:2;
  grid-template-rows:auto minmax(0,1fr) auto;
  align-self:stretch;
  gap:9px;
  min-width:0;
  padding:18px 16px;
  border-left:1px solid var(--line);
  background:color-mix(in srgb,var(--panel) 96%,transparent);
}
.study-feature-outline h3 { margin:0; color:var(--ink); font:400 23px/1.2 var(--serif); }
.study-feature-outline-list { display:grid; align-content:start; gap:3px; min-width:0; }
.study-feature-outline-row {
  display:grid;
  grid-template-columns:22px 22px minmax(0,1fr);
  align-items:center;
  gap:8px;
  min-width:0;
  min-height:38px;
  padding:6px 8px;
  border:0;
  border-radius:7px;
  color:var(--muted);
  background:transparent;
  font:15px/1.35 var(--sans);
  text-align:left;
  text-decoration:none;
  cursor:pointer;
}
.study-feature-outline-row:hover,.study-feature-outline-row.is-current { background:var(--accent-surface); }
.study-feature-outline-row:focus-visible { outline:2px solid var(--gold); outline-offset:1px; background:var(--accent-surface); }
.study-feature-outline-index { grid-column:2; grid-row:1; color:var(--gold); font-size:14px; font-variant-numeric:tabular-nums; }
.study-feature-outline-title { grid-column:3; grid-row:1; min-width:0; overflow:visible; text-overflow:clip; white-space:normal; overflow-wrap:break-word; line-height:1.35; }
.study-feature-outline-state { grid-column:1; grid-row:1; display:grid; width:22px; height:22px; place-items:center; color:var(--on-accent); border:1px solid var(--line-strong); border-radius:50%; background:transparent; font:600 13px/1 var(--sans); }
.study-feature-outline-empty { margin:0; color:var(--muted); font-size:12px; line-height:1.5; }
.study-feature-outline-more { justify-self:start; padding:4px 0; border:0; color:var(--gold); background:transparent; font:12px var(--sans); cursor:pointer; }
.study-feature-outline-more:hover { color:var(--gold-soft); }
.study-dashboard-intro h1 { text-wrap:balance; }

@media(max-width:900px) {
  .study-page .study-feature { grid-template-columns:minmax(0,1fr); min-height:0; }
  .study-page .study-feature-art { position:relative; grid-column:1; grid-row:1; inset:auto; height:clamp(170px,34vw,250px); }
  .study-page .study-feature-art::after { background:linear-gradient(0deg,var(--panel) 0%,color-mix(in srgb, var(--ground) 12%, transparent) 60%); }
  .study-page .study-feature-copy { grid-column:1; grid-row:2; padding:22px 24px; background:var(--panel); }
  .study-page .study-feature-outline { grid-column:1; grid-row:3; border-top:1px solid var(--line); border-left:0; }
}
@media(max-width:600px) {
  .study-page .study-feature-copy { padding:19px; }
  .study-page .study-feature-copy h2 { font-size:30px; }
  .study-page .study-feature-copy .study-feature-actions { display:grid; grid-template-columns:1fr; }
  .study-page .study-feature-copy .study-feature-actions .btn { width:100%; }
  .study-page .study-feature-outline { padding:15px; }
}

.study-dashboard-intro h1 { font-size:clamp(38px,3.4vw,44px); }
.study-page .study-other-topics { max-width:none; grid-template-columns:repeat(3,minmax(0,1fr)); align-items:start; gap:18px; }
.study-page .study-started-column .study-section-heading h2,
.study-page .study-exam-heading h2 { font-size:23px; text-wrap:balance; }
.study-page .study-topic-row { grid-template-columns:48px minmax(0,1fr) auto; gap:8px; min-height:84px; padding:10px 2px; }
.study-page .study-topic-thumb { grid-column:1; grid-row:1/4; width:48px; height:54px; }
.study-page .study-topic-copy { grid-column:2/4; grid-row:1; min-width:0; }
.study-page .study-topic-copy strong { min-width:0; overflow:visible; text-overflow:clip; white-space:normal; overflow-wrap:break-word; line-height:1.25; }
.study-page .study-topic-progress-track { grid-column:2; grid-row:2; align-self:center; width:100%; }
.study-page .study-topic-percent { grid-column:3; grid-row:2; }
.study-page .study-topic-action { grid-column:2/4; grid-row:3; justify-self:start; min-height:30px; padding:5px 9px; }
.study-page .study-completed-list { display:grid; border-top:1px solid var(--learn-line); }
.study-completed-topic { display:grid; grid-template-columns:48px minmax(0,1fr) 16px; align-items:center; gap:9px; min-width:0; min-height:68px; padding:8px 2px; border:0; border-bottom:1px solid var(--line); color:var(--learn-ink); background:transparent; text-align:left; cursor:pointer; }
.study-completed-topic:hover { background:var(--panel); }
.study-completed-topic-thumb { width:48px; height:48px; object-fit:cover; border-radius:5px; background:var(--panel-raised); }
.study-completed-topic-copy { display:grid; min-width:0; gap:4px; }
.study-completed-topic-copy strong { min-width:0; overflow:visible; font:400 16px/1.2 var(--serif); text-overflow:clip; white-space:normal; overflow-wrap:break-word; }
.study-completed-topic-copy small { color:var(--learn-muted); font-size:12px; }
.study-completed-topic .study-topic-arrow { color:var(--gold); }

@media(max-width:1100px) {
  .study-page .study-other-topics { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .study-page .study-completed-column { grid-column:1/-1; }
}
@media(max-width:650px) {
  .study-page .study-other-topics { grid-template-columns:1fr; gap:20px; }
  .study-page .study-completed-column { grid-column:auto; }
}
.learning-search:focus-within,.library-search:focus-within,.study-catalog-shortcut:focus-within { outline:2px solid var(--learn-bronze-light,var(--gold-soft)); outline-offset:3px; }

/* Study pages keep the current action and reading state together. */
.study-page .study-dashboard-head { grid-template-columns:minmax(0,1fr) minmax(190px,260px); align-items:start; }
.study-dashboard-progress { min-width:0; color:var(--learn-muted); font-size:12px; font-variant-numeric:tabular-nums; text-align:right; }
.study-dashboard-progress small { color:var(--learn-muted); font-size:12px; white-space:nowrap; }
.study-dashboard-progress[hidden] { display:none; }
.study-dashboard-action { color:var(--gold-soft); border-color:var(--accent-border); background:transparent; }
.study-dashboard-action:hover { background:var(--accent-surface); }
.study-topic-page .learning-heading { display:grid; grid-template-columns:minmax(0,1fr) minmax(270px,390px); align-items:start; gap:24px; margin:0 0 4px; }
.study-topic-heading .learning-intro { max-width:none; }
.study-topic-breadcrumb { display:flex; align-items:center; gap:8px; margin:0 0 8px; color:var(--learn-muted); font-size:12px; }
.study-breadcrumb-link { color:var(--learn-muted); text-decoration:underline; text-decoration-color:color-mix(in srgb, var(--muted) 55%, transparent); text-underline-offset:3px; }
.study-breadcrumb-link:hover { color:var(--learn-ink); text-decoration-color:var(--learn-bronze); }
.study-breadcrumb-separator { color:var(--muted); }
.study-breadcrumb-current { color:var(--ink); }
.study-topic-page .study-topic-tabs { margin-bottom:12px; }
.study-topic-header-actions { display:flex; flex-direction:column; align-items:flex-end; gap:12px; padding-top:18px; }
.study-topic-header-progress { display:block; color:var(--learn-muted); font-size:13px; font-variant-numeric:tabular-nums; text-align:right; }
.study-topic-header-track { display:block; height:4px; overflow:hidden; border-radius:4px; background:var(--line); }
.study-topic-header-track i { display:block; height:100%; border-radius:inherit; background:var(--learn-bronze); }
.study-topic-header-action { width:min(276px,max(238px,18.6vw)); min-height:54px; white-space:nowrap; }
.study-topic-overview-actions .study-topic-exam-passed.is-retry { color:var(--gold); }
.study-library-callout { display:flex; align-items:center; justify-content:space-between; gap:24px; margin:24px 0 18px; padding:20px 23px; border:1px solid var(--line); border-radius:9px; background:linear-gradient(110deg,var(--panel),var(--panel) 78%); }
.study-library-callout-copy h2 { margin:0 0 5px; color:var(--learn-ink); font:400 24px/1.2 var(--serif); }
.study-library-callout-copy p { margin:0; color:var(--learn-muted); font-size:13px; line-height:1.5; }
.study-library-callout-actions { display:flex; flex-wrap:wrap; align-items:center; flex:0 0 auto; gap:16px; }
.study-library-callout-actions .btn:not(.primary) { min-height:42px; white-space:nowrap; color:var(--learn-ink); border-color:var(--line); background:transparent; }
.study-library-callout-actions .btn:not(.primary):hover:not(:disabled) { border-color:var(--line-strong); background:var(--panel-raised); }
.study-library-callout-actions .btn.primary { min-height:42px; color:var(--on-accent); border-color:var(--accent-border); background:var(--gold); }
.study-library-callout-actions .study-outline-link { margin:0; }
.study-section-link { min-height:34px; font-size:12px; }
.study-section-link > span:last-child { min-width:0; overflow:visible; text-overflow:clip; white-space:normal; overflow-wrap:break-word; line-height:1.35; }
.study-section-link[aria-current="page"] { color:var(--gold-soft); background:var(--panel); }
.study-section-link:disabled { opacity:.5; }
@media(max-width:1100px) {
  .study-topic-page .learning-heading { grid-template-columns:minmax(0,1fr) minmax(250px,340px); }
}
@media(max-width:760px) {
  .study-page .study-dashboard-head { grid-template-columns:1fr; gap:14px; }
  .study-dashboard-tools { max-width:320px; justify-self:start; }
  .study-topic-page .learning-heading { grid-template-columns:1fr; gap:12px; }
  .study-topic-header-actions { max-width:420px; align-items:flex-start; padding-top:0; }
  .study-topic-header-progress { text-align:left; }
  .study-library-callout { align-items:flex-start; flex-direction:column; gap:16px; }
  .study-library-callout-actions { width:100%; justify-content:flex-start; }
}
@media(max-width:480px) {
  .study-dashboard-action { min-height:40px; }
  .study-topic-header-actions { align-items:stretch; }
  .study-topic-header-action { justify-self:start; }
  .study-library-callout-actions { align-items:flex-start; flex-direction:column; gap:8px; }
}
@media(prefers-reduced-motion:reduce) {
  .study-progress-track span { transition:none; }
}

/* Bring the study dashboard and topic detail closer to the approved references. */
.study-page .study-dashboard { gap:12px; }
.study-page .study-dashboard-head { grid-template-columns:minmax(0,1fr) minmax(195px,clamp(195px,16.7vw,250px)); }
.study-dashboard-intro h1 { font-size:clamp(46px,3.8vw,56px); }
.study-dashboard-intro .lede { max-width:70ch; }
.study-feature-description { font-size:15px; line-height:1.62; }
.study-page .study-feature-art img { filter:saturate(.82) brightness(.86); }
.study-page .study-feature { grid-template-columns:minmax(0,1.85fr) minmax(220px,.75fr); min-height:clamp(276px,22.5vw,334px); }
.study-page .study-feature-art { inset:0 29% 0 0; }
.study-page .study-feature-art::after { background:linear-gradient(90deg,color-mix(in srgb, var(--ground) 12%, transparent),color-mix(in srgb, var(--ground) 62%, transparent) 76%,var(--panel) 100%); }
.study-page .study-feature-copy { padding:24px clamp(22px,2.1vw,32px); }
.study-page .study-feature-copy .study-feature-actions { margin-top:15px; }
.study-page .study-feature-copy .study-feature-actions .study-feature-continue { min-height:48px; padding:10px 22px; }
.study-feature-outline-row { grid-template-columns:22px 22px minmax(0,1fr); min-height:38px; gap:8px; padding:6px 8px; font-size:15px; }
.study-feature-outline-state.is-complete { color:var(--green); border-color:color-mix(in srgb, var(--green) 45%, var(--line)); background:transparent; }
.study-feature-outline-state.is-current { border-color:var(--gold); background:var(--gold); }
.study-feature-outline-state.is-upcoming { background:transparent; }
.study-section-link { grid-template-columns:22px minmax(0,1fr); gap:10px; min-height:36px; padding:6px 10px; font-size:13px; }
.study-section-index { display:grid; width:19px; height:19px; place-items:center; border:1px solid var(--line-strong); border-radius:50%; color:var(--gold); font-size:12px; font-variant-numeric:tabular-nums; }
.study-section-link.is-complete .study-section-index { border-color:color-mix(in srgb, var(--green) 45%, var(--line)); color:var(--green); }
.study-section-link.is-in-progress .study-section-index,.study-section-link.active .study-section-index { border-color:var(--gold); color:var(--gold-soft); }
.study-section-title { min-width:0; flex:1 1 auto; white-space:normal; overflow-wrap:anywhere; line-height:1.35; }
.study-section-link.active { border-left-color:var(--gold); }
.study-topic-overview-hero { grid-template-columns:minmax(0,1.58fr) minmax(280px,.95fr); height:clamp(330px,24vw,360px); min-height:0; }
.study-topic-overview-cover,.study-topic-overview-cover img { height:100%; min-height:0; }
.study-topic-overview-aside { justify-content:center; gap:13px; padding:24px clamp(22px,2.4vw,36px); }
.study-topic-overview-aside p { color:var(--muted); font-size:15px; line-height:1.62; }
.study-topic-overview-facts { display:grid; margin-top:2px; }
.study-topic-overview-fact { min-height:37px; display:flex; align-items:center; padding:7px 0; color:var(--gold); font-size:13px; }
.study-topic-overview-fact + .study-topic-overview-fact { border-top:1px solid var(--line); }
.study-page .study-other-topics { align-items:stretch; gap:16px; margin-top:18px; }
.study-page .study-started-column,
.study-page .study-exam-column,
.study-page .study-completed-column { min-width:0; min-height:clamp(300px,22vw,345px); padding:15px 15px 12px; border:1px solid var(--line); border-radius:10px; background:linear-gradient(145deg,var(--panel),var(--panel) 75%); }
.study-page .study-topic-list,
.study-page .study-exam-list,
.study-page .study-completed-list { border-top:0; }
.study-page .study-started-column .study-section-heading h2,
.study-page .study-exam-heading h2,
.study-page .study-completed-column .study-section-heading h2 { font-size:21px; }
.study-page .study-started-column .study-section-heading,
.study-page .study-exam-heading,
.study-page .study-completed-column .study-section-heading { min-height:34px; padding-bottom:8px; border-bottom:1px solid var(--line); }
.study-page .study-topic-row { padding:9px 0; }
.study-page .study-exam-card { padding:12px 0; }
.study-page .study-completed-list { align-content:start; }
@media(max-width:760px) {
  .study-page .study-feature { grid-template-columns:minmax(0,1fr); min-height:0; }
  .study-page .study-feature-art { inset:auto; }
  .study-page .study-feature-art::after { background:linear-gradient(0deg,var(--panel) 0%,color-mix(in srgb, var(--ground) 12%, transparent) 60%); }
  .study-topic-overview-hero { grid-template-columns:minmax(0,1fr); height:auto; }
  .study-topic-overview-cover,.study-topic-overview-cover img { min-height:clamp(190px,54vw,280px); height:clamp(190px,54vw,280px); }
  .study-topic-overview-aside { padding:20px; }
}
.study-page .study-feature-copy h2 { max-width:22ch; }
.study-page .study-started-column,
.study-page .study-exam-column,
.study-page .study-completed-column { min-width:0; padding:14px 13px 9px; border:1px solid var(--line); border-radius:10px; background:linear-gradient(145deg,var(--panel),var(--panel)); }
.study-page .study-started-column .study-section-heading,
.study-page .study-exam-column .study-exam-heading,
.study-page .study-completed-column .study-section-heading { min-height:33px; margin-bottom:8px; }
.study-page .study-topic-list,
.study-page .study-exam-list,
.study-page .study-completed-list { border-top:0; }
.study-page .study-started-column .study-section-heading h2,
.study-page .study-exam-heading>h2,
.study-page .study-completed-column .study-section-heading h2 { font-size:22px; line-height:1.2; }

/* Reference-led study dashboard: larger topic rows, quieter controls, clear progress. */
.study-page .study-feature-progress { display:grid; grid-template-columns:minmax(0,1fr); justify-items:start; gap:8px; margin-top:21px; font-size:14px; }
.study-page .study-feature-progress .study-progress-track { width:min(320px,100%); height:8px; }
.study-page .study-feature-copy>.learning-meta { display:none; }
.study-page .study-feature-art.is-empty { background:radial-gradient(ellipse at 28% 45%,var(--panel-raised) 0,var(--panel) 54%,var(--panel) 100%); }
.study-page .study-topic-thumb-placeholder,
.study-page .study-exam-thumb-placeholder,
.study-page .study-completed-topic-thumb-placeholder { display:grid; place-items:center; color:var(--gold); border:1px solid var(--line); background:linear-gradient(145deg,var(--panel-raised),var(--panel)); }
.study-page .study-topic-thumb-frame,
.study-page .study-exam-thumb-frame,
.study-page .study-completed-topic-thumb-frame { position:relative; overflow:hidden; }
.study-page .study-topic-thumb-frame>img,
.study-page .study-exam-thumb-frame>img,
.study-page .study-completed-topic-thumb-frame>img { position:absolute; inset:0; display:block; width:100%; height:100%; object-fit:cover; }
.study-page .study-topic-thumb-fallback,
.study-page .study-exam-thumb-fallback,
.study-page .study-completed-topic-thumb-fallback { display:grid; width:100%; height:100%; place-items:center; }
.study-page .study-topic-thumb-placeholder svg,
.study-page .study-exam-thumb-placeholder svg,
.study-page .study-completed-topic-thumb-placeholder svg { width:24px; height:24px; }
.study-page .study-section-heading,
.study-page .study-exam-heading { display:flex; align-items:center; gap:8px; }
.study-page .study-section-count { display:grid; min-width:24px; height:24px; place-items:center; padding:0 6px; color:var(--ink); border-radius:50%; background:var(--panel-raised); font:12px/1 var(--sans); font-variant-numeric:tabular-nums; }
.study-page .study-started-column .study-section-heading h2,
.study-page .study-exam-heading>h2,
.study-page .study-completed-column .study-section-heading h2 { font-size:20px; }
.study-page .study-section-heading .learning-card-action,
.study-page .study-exam-heading .learning-card-action { margin-left:auto; font-size:12px; white-space:nowrap; }
.study-page .study-topic-list { display:grid; gap:0; }
.study-page .study-topic-row {
  display:grid;
  grid-template-columns:78px minmax(0,1fr);
  grid-template-rows:auto 5px;
  align-items:center;
  gap:5px 12px;
  min-height:82px;
  padding:9px 0;
  border:0;
  border-bottom:1px solid var(--line);
  border-radius:0;
  color:var(--learn-ink);
  background:transparent;
  font:inherit;
  text-align:left;
}
.study-page .study-topic-row:hover { border-color:var(--line); background:var(--panel); }
.study-page .study-topic-row:focus-visible,
.study-page .study-completed-topic:focus-visible { outline:2px solid var(--learn-bronze-light,var(--gold-soft)); outline-offset:2px; }
.study-page .study-topic-thumb { grid-column:1; grid-row:1/3; width:78px; height:68px; border-radius:6px; }
.study-page .study-topic-copy { grid-column:2; grid-row:1; gap:4px; }
.study-page .study-topic-copy strong { font-size:17px; line-height:1.2; }
.study-page .study-topic-copy small { font-size:12px; }
.study-page .study-topic-progress-track { grid-column:2; grid-row:2; width:100%; height:5px; }
.study-page .study-topic-percent,.study-page .study-topic-action { display:none; }
.study-page .study-exam-list { display:grid; }
.study-page .study-exam-card {
  grid-template-columns:72px minmax(0,1fr);
  grid-template-rows:auto auto;
  align-items:start;
  gap:4px 11px;
  min-height:87px;
  padding:10px 0;
}
.study-page .study-exam-thumb { grid-column:1; grid-row:1/3; width:72px; height:68px; border-radius:6px; }
.study-page .study-exam-copy { grid-column:2; gap:5px; }
.study-page .study-exam-copy strong { font-size:17px; line-height:1.2; white-space:normal; }
.study-page .study-exam-copy small { font-size:12px; line-height:1.4; }
.study-page .study-exam-actions { grid-column:2; justify-content:flex-start; margin-top:2px; }
.study-page .study-exam-action,.study-page .study-exam-retry { min-height:32px; padding:5px 10px; font-size:12px; }
.study-page .study-completed-list { display:grid; align-content:start; }
.study-page .study-completed-topic { grid-template-columns:72px minmax(0,1fr) 22px; gap:10px; min-height:83px; padding:8px 0; }
.study-page .study-completed-topic-thumb { width:72px; height:68px; border-radius:6px; }
.study-page .study-completed-topic-copy { gap:4px; }
.study-page .study-completed-topic-copy strong { font-size:17px; white-space:normal; }
.study-page .study-completed-topic-copy small { font-size:12px; }
.study-page .study-completed-status { display:grid; width:22px; height:22px; place-items:center; color:var(--on-accent); border-radius:50%; background:var(--green); font:600 13px/1 var(--sans); }
.study-page .study-dashboard-empty { min-height:200px; align-content:center; padding:18px 8px; text-align:left; }
.study-library-callout { align-items:center; min-height:82px; padding:16px 20px; }
.study-library-callout-copy { display:flex; min-width:0; align-items:center; gap:14px; }
.study-library-callout-icon { display:grid; width:48px; height:48px; flex:0 0 auto; place-items:center; color:var(--gold); border-radius:50%; background:var(--panel-raised); }
.study-library-callout-icon svg { width:27px; height:27px; }
.study-library-callout-text { min-width:0; }
.study-library-callout-copy h2 { font-size:21px; }
.study-library-callout-actions { margin-left:auto; }
.study-library-callout-actions .btn.primary { min-width:230px; }

/* Topic details keep the reference layout while using an honest cover fallback. */
.study-topic-overview-cover.is-empty {
  position:relative;
  display:flex;
  min-width:0;
  flex-direction:column;
  align-items:flex-start;
  justify-content:flex-end;
  gap:12px;
  overflow:hidden;
  padding:clamp(24px,3.6vw,48px);
  background:
    radial-gradient(ellipse at 76% 26%,color-mix(in srgb, var(--muted) 15%, transparent) 0,transparent 34%),
    linear-gradient(135deg,var(--panel-raised) 0%,var(--panel) 53%,var(--panel) 100%);
}
.study-topic-overview-cover.is-empty::before {
  position:absolute;
  inset:0;
  z-index:0;
  content:"";
  background:
    linear-gradient(90deg,transparent 49.7%,color-mix(in srgb, var(--ink) 4%, transparent) 50%,transparent 50.3%),
    linear-gradient(transparent 49.7%,color-mix(in srgb, var(--ink) 4%, transparent) 50%,transparent 50.3%),
    radial-gradient(ellipse at 50% 50%,transparent 48%,color-mix(in srgb, var(--ink) 5%, transparent) 48.2%,transparent 48.6%);
  pointer-events:none;
}
.study-topic-cover-context,.study-topic-cover-period { position:relative; z-index:1; }
.study-topic-cover-context { max-width:42ch; color:var(--muted); font:400 14px/1.45 var(--sans); }
.study-topic-cover-period { max-width:100%; color:var(--ink); font:400 clamp(28px,2.8vw,40px)/1.02 var(--serif); text-wrap:balance; }
.study-topic-section-row {
  grid-template-columns:28px 82px minmax(0,1fr) minmax(76px,auto) minmax(66px,auto);
  gap:12px;
  min-height:78px;
  padding:8px 12px;
}
.study-topic-section-thumb {
  display:grid;
  width:82px;
  height:62px;
  place-items:center;
  color:var(--gold);
  border:1px solid var(--line);
  border-radius:6px;
  background:linear-gradient(145deg,var(--panel-raised),var(--panel) 72%);
}
.study-topic-section-copy { gap:4px; }
.study-topic-section-copy strong { font-size:18px; }
.study-topic-section-copy small { font-size:13px; line-height:1.4; }
.study-topic-section-duration { display:inline-flex; align-items:center; gap:7px; color:var(--muted); font-size:12px; white-space:nowrap; font-variant-numeric:tabular-nums; }
.study-topic-section-duration svg { color:var(--muted); }
.study-topic-section-state { display:inline-flex; min-width:66px; align-items:center; justify-content:flex-end; color:var(--gold); font-size:12px; white-space:nowrap; }
@media(max-width:1100px) {
  .study-topic-section-row { grid-template-columns:25px 70px minmax(0,1fr) auto; gap:10px; }
  .study-topic-section-thumb { width:70px; height:56px; }
  .study-topic-section-duration { grid-column:3; grid-row:2; }
  .study-topic-section-state { grid-column:4; grid-row:1/3; }
  .study-page .study-topic-row { grid-template-columns:66px minmax(0,1fr); }
  .study-page .study-topic-thumb { width:66px; height:60px; }
}
@media(max-width:760px) {
  .study-page .study-feature-progress { margin-top:15px; }
  .study-page .study-library-callout { align-items:flex-start; }
  .study-page .study-library-callout-actions { width:100%; margin-left:62px; }
  .study-page .study-library-callout-actions .btn.primary { width:100%; min-width:0; }
}
@media(max-width:480px) {
  .study-topic-overview-cover.is-empty { min-height:170px; height:170px; padding:20px; }
  .study-topic-cover-period { font-size:32px; }
  .study-topic-section-row { grid-template-columns:22px 54px minmax(0,1fr); grid-template-rows:auto auto auto; gap:4px 8px; min-height:74px; padding:8px; }
  .study-topic-section-number { grid-column:1; grid-row:1/4; }
  .study-topic-section-thumb { grid-column:2; grid-row:1/4; width:54px; height:50px; }
  .study-topic-section-thumb svg { width:18px; height:18px; }
  .study-topic-section-copy { grid-column:3; grid-row:1; }
  .study-topic-section-copy strong { font-size:16px; white-space:normal; }
  .study-topic-section-copy small { font-size:12px; }
  .study-topic-section-duration { grid-column:3; grid-row:2; font-size:12px; }
  .study-topic-section-state { grid-column:3; grid-row:3; justify-content:flex-start; }
  .study-page .study-library-callout-copy { align-items:flex-start; }
  .study-page .study-library-callout-actions { margin-left:0; }
  .study-page .study-library-callout-actions .btn:not(.primary) { width:100%; }
}

/* Keep the study title and its action in a true single-column mobile header. */
@media(max-width:760px) {
  .study-page .study-dashboard-head {
    display:grid;
    grid-template-columns:minmax(0,1fr);
    align-items:start;
    gap:12px;
  }
  .study-dashboard-intro h1 { font-size:clamp(36px,10vw,42px); }
  .study-dashboard-intro .lede { max-width:none; }
  .study-dashboard-tools { width:100%; max-width:none; justify-self:stretch; }
  .study-dashboard:has(.study-feature-continue) .study-dashboard-tools { display:none; }
  .study-dashboard-action { width:100%; min-height:46px; justify-self:stretch; }
  .study-dashboard-progress { text-align:left; }
}

/* Topic detail: preserve full event text and keep controls readable on narrow screens. */
.study-topic-tabs [role="tab"] { touch-action:manipulation; }
.study-topic-tab:focus-visible,.study-topic-section-row:focus-visible,.study-topic-source-link:focus-visible,.study-topic-related-row:focus-visible { outline:2px solid var(--gold-soft); outline-offset:3px; }
.study-topic-tab-content { min-width:0; }
.study-topic-overview-aside p { overflow-wrap:anywhere; }
.study-topic-section-row { grid-template-columns:28px 58px minmax(0,1fr) minmax(76px,auto) minmax(66px,auto); min-height:78px; gap:12px; padding:8px 12px; }
.study-topic-section-thumb { width:58px; height:54px; }
.study-topic-section-copy { align-content:center; gap:4px; }
.study-topic-section-copy strong { overflow:visible; white-space:normal; overflow-wrap:anywhere; text-overflow:clip; }
.study-topic-section-copy small { display:-webkit-box; overflow:hidden; line-height:1.4; overflow-wrap:break-word; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.study-topic-section-duration { min-width:0; white-space:normal; }
.study-topic-section-state { white-space:nowrap; }
.study-topic-source-row>span { flex:1 1 auto; }
.study-topic-source-row strong { overflow-wrap:anywhere; white-space:normal; }
.study-topic-source-row small { overflow-wrap:anywhere; }
@media(min-width:1200px) {
  .study-topic-page { width:calc(100% - 28px); margin-left:23px; }
  .study-topic-overview-hero { grid-template-columns:minmax(0,1.62fr) minmax(320px,1fr); }
}
@media(max-width:700px) {
  .study-topic-section-row { grid-template-columns:26px 42px minmax(0,1fr) auto; gap:8px; padding:10px; }
  .study-topic-section-thumb { width:42px; height:42px; }
  .study-topic-section-duration { grid-column:3; grid-row:2; }
  .study-topic-section-state { grid-column:4; grid-row:1/3; justify-self:start; }
}
@media(max-width:480px) {
  .study-topic-page .learning-heading { margin-top:4px; }
  .study-topic-tabs { gap:15px; }
  .study-topic-tab { font-size:12px; }
  .study-topic-section-row { grid-template-columns:22px 42px minmax(0,1fr); grid-template-rows:auto auto auto; gap:4px 8px; min-height:74px; padding:8px; }
  .study-topic-section-number { grid-column:1; grid-row:1/4; }
  .study-topic-section-thumb { display:grid; grid-column:2; grid-row:1/4; width:42px; height:42px; }
  .study-topic-section-copy { grid-column:3; grid-row:1; }
  .study-topic-section-copy strong { font-size:16px; }
  .study-topic-section-copy small { font-size:12px; }
  .study-topic-section-duration { grid-column:3; grid-row:2; font-size:12px; }
  .study-topic-section-state { grid-column:3; grid-row:3; justify-content:flex-start; }
}

/* Study reference calibration: distinct cover and compact factual outline. */
@media(min-width:901px) {
  .study-page:has(.study-dashboard) { padding-top:0; }
  .study-page .study-dashboard-head { margin-bottom:12px; }
  .study-page .study-feature { grid-template-columns:minmax(0,2.5fr) minmax(280px,1fr); gap:14px; overflow:visible; border:0; border-radius:0; background:transparent; min-height:332px; }
  .study-page .study-feature-art { inset:0 calc(28.571% + 10px) 0 0; border:1px solid var(--line); border-radius:9px; }
  .study-page .study-feature-art::after { background:linear-gradient(90deg,color-mix(in srgb, var(--ground) 64%, transparent),color-mix(in srgb, var(--ground) 12%, transparent) 85%); }
  .study-page .study-feature-art img { filter:saturate(.82) brightness(.95); }
  .study-page .study-feature-copy { border-radius:9px; background:transparent; }
  .study-page .study-feature-copy h2 { max-width:20ch; font-size:36px; }
  .study-page .study-feature-copy .study-feature-actions .btn { width:min(316px,100%); min-height:52px; font-size:16px; }
  .study-page .study-feature-copy { justify-content:flex-end; padding-bottom:28px; }
  .study-page .study-feature-outline { border:1px solid var(--line); border-radius:9px; background:var(--panel); padding:16px 10px; }
  .study-page .study-feature-outline h3 { padding-left:8px; }
  .study-topic-overview-hero { gap:12px; overflow:visible; border:0; border-radius:0; background:transparent; }
  .study-topic-overview-cover { overflow:hidden; border:1px solid var(--line); border-radius:10px; }
  .study-topic-overview-aside { grid-column:auto; justify-content:flex-start; padding:22px; border:1px solid var(--line); border-radius:10px; }
}
.study-page .study-feature-outline-row { grid-template-columns:22px minmax(0,1fr); column-gap:12px; position:relative; padding:7px 10px; }
.study-page .study-feature-outline-index { grid-column:2; grid-row:1; align-self:start; margin-top:1px; }
.study-page .study-feature-outline-title { grid-column:2; grid-row:1; padding-left:20px; font-size:14px; }
.study-page .study-topic-copy strong,.study-page .study-exam-copy strong,.study-page .study-completed-topic-copy strong { font-family:var(--sans); font-size:16px; font-weight:400; }
.study-topic-overview-fact { gap:14px; color:var(--muted); }
.study-topic-overview-fact svg { flex:none; color:var(--gold); }
.study-topic-overview-fact + .study-topic-overview-fact { border-top:0; }
.study-topic-section-row { grid-template-columns:28px 112px minmax(0,1fr) minmax(76px,auto) 32px; gap:16px; padding:0 16px 0 12px; }
.study-topic-section-thumb { width:112px; height:70px; border-radius:0; }
.study-topic-section-state { min-width:0; justify-content:center; font-size:23px; }
.study-topic-section-state.is-done { width:25px; height:25px; justify-self:center; border-radius:50%; color:var(--on-accent); background:var(--green); font-size:17px; }
@media(max-width:900px) {
  .study-topic-section-row { grid-template-columns:26px 54px minmax(0,1fr) 32px; gap:10px; padding:8px; }
  .study-topic-section-thumb { width:54px; height:54px; }
}
@media(max-width:480px) {
  .study-topic-section-row { grid-template-columns:22px 42px minmax(0,1fr); gap:4px 8px; }
  .study-topic-section-thumb { width:42px; height:42px; }
  .study-topic-section-state { font-size:18px; }
  .study-topic-section-duration { font-size:12px; }
}
@media(min-width:901px) {
  .study-topic-tabs { gap:48px; }
  .study-topic-tab { min-height:48px; font-size:16px; }
  .study-topic-section-copy strong { font-size:20px; }
  .study-topic-section-copy small { font-size:14px; }
  .study-topic-section-duration { font-size:14px; }
  .study-topic-overview-aside h2 { font-size:26px; }
  .study-topic-overview-aside p,.study-topic-overview-fact { font-size:16px; }
}

/* Timeline ("Линия времени"): era ruler, one-row filters, vertical axis grouped by era. */
.chrono-section { margin-top:4px; }
.chrono-ruler { display:grid; grid-template-columns:repeat(5,minmax(0,1fr)); gap:6px; margin:0 0 14px; }
.chrono-ruler-era { position:relative; display:grid; grid-template-columns:minmax(0,1fr) auto; align-items:baseline; gap:6px; min-height:58px; padding:9px 11px 26px; color:var(--muted); border:1px solid var(--line); border-radius:8px; background:var(--panel); text-align:left; cursor:pointer; transition:border-color .15s ease, background-color .15s ease; }
.chrono-ruler-era:hover:not(:disabled) { border-color:var(--line-strong); }
.chrono-ruler-era:disabled { opacity:.45; cursor:default; }
.chrono-ruler-era.is-current { color:var(--gold-soft); border-color:var(--accent-border); background:var(--accent-surface); }
.chrono-ruler-title { overflow:hidden; color:var(--ink); font-size:13px; text-overflow:ellipsis; white-space:nowrap; }
.chrono-ruler-era.is-current .chrono-ruler-title { color:var(--gold-soft); }
.chrono-ruler-count { font-size:12px; font-variant-numeric:tabular-nums; }
.chrono-ruler-ticks { position:absolute; left:12px; right:12px; bottom:8px; height:10px; }
.chrono-ruler-ticks i { position:absolute; bottom:0; width:2px; height:10px; margin-left:-1px; border-radius:1px; background:var(--line-strong); opacity:.75; }
.chrono-ruler-era.is-current .chrono-ruler-ticks i { background:var(--gold-soft); opacity:.85; }
.chrono-toolbar { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:0 0 10px; }
.chrono-search-wrap { flex:1 1 260px; min-width:0; }
.chrono-toolbar .chrono-search { width:100%; min-height:42px; }
.chrono-toolbar .chrono-topic { width:260px; min-height:42px; }
.chrono-list { position:relative; border-top:0; }
.chrono-era { position:sticky; top:var(--header-height); z-index:3; display:flex; flex-wrap:wrap; align-items:baseline; gap:4px 12px; margin:22px 0 4px; padding:12px 0 9px; border-bottom:1px solid var(--line); background:var(--ground); }
.chrono-era-title { color:var(--ink); font:400 24px/1.15 var(--serif); }
.chrono-era-meta { color:var(--muted); font:400 12px/1.4 var(--sans); }
.chrono-event { position:relative; display:grid; grid-template-columns:168px 22px minmax(0,1fr); column-gap:14px; padding:12px 0; }
.chrono-event::before { content:""; position:absolute; top:0; bottom:0; left:193px; width:1px; background:var(--line); }
.chrono-date { padding-top:3px; color:var(--ink); font-size:14px; line-height:1.35; font-variant-numeric:tabular-nums lining-nums; text-align:right; text-wrap:balance; }
.chrono-date-approx { color:var(--muted); }
.chrono-dot { position:relative; z-index:1; justify-self:center; width:9px; height:9px; margin-top:8px; border:1px solid var(--muted); border-radius:50%; background:var(--ground); }
.chrono-event.is-studied .chrono-dot { border-color:var(--green); background:color-mix(in srgb,var(--green) 22%,var(--ground)); }
.chrono-event.is-selected .chrono-dot { border-color:var(--gold-soft); background:var(--gold-soft); }
.chrono-copy { min-width:0; }
.chrono-title { display:block; padding:0; border:0; color:var(--ink); background:transparent; font:400 19px/1.3 var(--serif); text-align:left; text-wrap:pretty; cursor:pointer; }
.chrono-title:hover { color:var(--gold-soft); }
.chrono-desc { display:-webkit-box; max-width:68ch; margin:4px 0 0; overflow:hidden; color:var(--muted); font-size:14px; line-height:1.55; -webkit-box-orient:vertical; -webkit-line-clamp:2; }
.chrono-meta { margin:6px 0 0; color:var(--muted); font-size:12px; }
.chrono-event.is-selected .chrono-copy { padding:14px 18px 16px; border:1px solid var(--accent-border); border-radius:9px; background:var(--panel); }
.chrono-event.is-selected .chrono-title { color:var(--gold-soft); font-size:21px; }
.chrono-gap { position:relative; margin:0; padding:6px 0 6px 218px; color:var(--line-strong); font-size:12px; font-variant-numeric:tabular-nums; }
.chrono-gap::before { content:""; position:absolute; top:0; bottom:0; left:193px; border-left:1px dashed var(--line-strong); }
.study-detail.is-inline { margin:10px 0 0; padding:0; border:0; border-radius:0; background:transparent; }
.study-detail.is-inline > .learning-kicker, .study-detail.is-inline > h2 { display:none; }
.study-detail.is-inline > p:first-of-type { margin-top:0; }
@media (max-width:760px) {
  .chrono-ruler { display:flex; overflow-x:auto; padding-bottom:4px; scrollbar-width:thin; }
  .chrono-ruler-era { flex:0 0 132px; }
  .chrono-toolbar .chrono-topic { width:100%; }
  .chrono-event { grid-template-columns:18px minmax(0,1fr); column-gap:12px; }
  .chrono-event::before, .chrono-gap::before { left:9px; }
  .chrono-dot { grid-column:1; grid-row:1 / span 2; margin-top:6px; }
  .chrono-date { grid-column:2; grid-row:1; padding:0; font-size:13px; text-align:left; }
  .chrono-copy { grid-column:2; grid-row:2; margin-top:3px; }
  .chrono-gap { padding-left:30px; }
}
.study-detail.is-inline > .learning-meta { margin:10px 0 0; }
.study-detail.is-inline .study-sources, .study-detail.is-inline .study-relations { margin-top:18px; gap:8px; }
.study-detail.is-inline .study-sources h3, .study-detail.is-inline .study-relations > h3 { font-size:18px; }
.study-detail.is-inline .study-source-list { display:flex; flex-wrap:wrap; gap:6px 20px; margin:0; padding:0; list-style:none; }

/* Reader (study_view=lesson), 28.10.2026: full-page book column with a sticky reading bar. */
.study-reader { width:100%; margin:0 auto 80px; }
.study-reader-bar { position:sticky; top:var(--header-height); z-index:8; display:grid; grid-template-columns:minmax(0,1fr) minmax(0,auto) minmax(0,1fr); align-items:center; gap:16px; margin:0 calc(-1 * var(--reader-gutter, 24px)); padding:10px var(--reader-gutter, 24px); border-bottom:1px solid var(--line); background:color-mix(in srgb,var(--ground) 94%,transparent); backdrop-filter:blur(8px); }
.study-reader-back { justify-self:start; max-width:100%; overflow:hidden; padding:6px 0; border:0; color:var(--muted); background:transparent; font-size:14px; text-overflow:ellipsis; white-space:nowrap; cursor:pointer; }
.study-reader-back:hover { color:var(--ink); }
.study-reader-bar-now { display:grid; justify-items:center; min-width:0; text-align:center; }
.study-reader-bar-section { max-width:46ch; overflow:hidden; color:var(--ink); font:400 17px/1.25 var(--serif); text-overflow:ellipsis; white-space:nowrap; }
.study-reader-bar-count { color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.study-reader-bar-actions { display:flex; justify-self:end; gap:6px; }
.study-reader-bar-action { min-height:34px; padding:0 12px; color:var(--muted); border:1px solid var(--line); border-radius:7px; background:transparent; font-size:13px; cursor:pointer; }
.study-reader-bar-action:hover, .study-reader-bar-action[aria-expanded="true"] { color:var(--ink); border-color:var(--line-strong); }
.study-reader-progress { position:absolute; left:0; right:0; bottom:-1px; height:2px; background:transparent; }
.study-reader-progress i { display:block; width:0; height:100%; background:var(--gold-soft); transition:width .2s ease-out; }
.study-reader-layout { display:grid; grid-template-columns:minmax(0,220px) minmax(0,700px) minmax(0,220px); justify-content:center; align-items:start; gap:56px; padding-top:56px; }
.study-reader-toc { position:sticky; top:calc(var(--header-height) + 80px); max-height:calc(calc(100vh / var(--ui-zoom, 1)) - var(--header-height) - 110px); overflow:auto; padding:0; }
.study-reader-toc > summary { display:none; }
.study-reader-toc-list { display:grid; gap:2px; padding:0; border:0; }
.study-reader-toc-item { display:grid; grid-template-columns:22px minmax(0,1fr); align-items:baseline; gap:8px; margin:0; padding:8px 10px; border:0; border-radius:7px; color:var(--muted); background:transparent; text-align:left; cursor:pointer; }
.study-reader-toc-item:hover { color:var(--ink); background:color-mix(in srgb,var(--ink) 4%,transparent); }
.study-reader-toc-item[aria-current="location"] { color:var(--ink); background:var(--panel); }
.study-reader-toc-index { color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.study-reader-toc-item[aria-current="location"] .study-reader-toc-index { color:var(--gold-soft); }
.study-reader-toc-title { font-size:14px; line-height:1.4; }
.study-reader-book { grid-column:2; min-width:0; }
.study-reader-book-title { margin:0 0 64px; padding-bottom:40px; border-bottom:1px solid var(--line); }
.study-reader-book-title .learning-kicker { margin:0 0 14px; }
.study-reader-book-title h1 { margin:0 0 18px; color:var(--ink); font:400 clamp(44px,5vw,64px)/1.05 var(--serif); text-wrap:balance; }
.study-reader-lede { max-width:60ch; margin:0 0 16px; color:var(--muted); font-size:18px; line-height:1.6; }
.study-reader-chapter { scroll-margin-top:calc(var(--header-height) + 76px); padding:0 0 56px; margin:0 0 56px; border-bottom:1px solid var(--line); }
.study-reader-date { margin:0 0 10px; color:var(--muted); font-size:14px; font-variant-numeric:tabular-nums; }
.study-reader-chapter h2 { margin:0 0 26px; color:var(--ink); font:400 clamp(30px,3.2vw,40px)/1.15 var(--serif); text-wrap:balance; }
.study-reader-paragraph { max-width:66ch; margin:0 0 1.1em; color:color-mix(in srgb,var(--ink) 94%,var(--muted)); font:400 21px/1.72 var(--serif); text-wrap:pretty; hanging-punctuation:first; }
.study-reader-sources, .study-reader-context { max-width:66ch; margin:32px 0 0; padding:0 0 0 16px; border-left:1px solid var(--line); }
.study-reader-sources a { font-size:14px; }
.study-reader-relation { font-size:19px; }
.study-reader-context > p { font-size:14px; }
.study-reader-chapter-footer { margin-top:36px; }
.study-reader-page-link { color:var(--muted); font-size:14px; cursor:pointer; }
.study-reader-page-link:hover { color:var(--ink); }
.study-reader-finish { display:grid; justify-items:start; gap:12px; padding:8px 0 24px; }
.study-reader-finish h2 { margin:0; font:400 32px/1.2 var(--serif); }
.study-reader-finish .learning-meta { margin:0 0 6px; }
@media (min-width:1280px) { .study-reader-toc-toggle { display:none; } }
@media (max-width:1279px) {
  .study-reader-layout { grid-template-columns:minmax(0,700px); gap:0; padding-top:36px; }
  .study-reader-book { grid-column:1; }
  .study-reader-toc { position:fixed; top:calc(var(--header-height) + 62px); right:var(--reader-gutter, 16px); z-index:9; width:min(320px,calc(100vw - 32px)); max-height:calc(60vh / var(--ui-zoom, 1)); padding:8px; border:1px solid var(--line); border-radius:10px; background:var(--panel-raised); box-shadow:0 16px 40px #000a; }
  .study-reader-toc:not([open]) { display:none; }
}
@media (max-width:760px) {
  .study-reader-bar { grid-template-columns:minmax(0,1fr) auto; padding-top:8px; padding-bottom:8px; gap:10px; }
  .study-reader-bar-now { display:none; }
  .study-reader-bar-action { padding:0 10px; }
  .study-reader-layout { padding-top:28px; }
  .study-reader-book-title { margin-bottom:40px; padding-bottom:28px; }
  .study-reader-paragraph { font-size:19px; line-height:1.68; }
  .study-reader-chapter { padding-bottom:40px; margin-bottom:40px; }
}
/* Reader as one continuous book: chapters flow without separators; sources once at the end. */
.study-reader-chapter { padding:0; margin:0 0 3.2em; border-bottom:0; }
.study-reader-chapter + .study-reader-chapter { padding-top:.4em; }
.study-reader-chapter h2 { margin:0 0 .7em; }
.study-reader-date { margin:0 0 6px; }
.study-reader-bibliography { margin:64px 0 40px; padding-top:32px; border-top:1px solid var(--line); }
.study-reader-bibliography h2 { margin:0 0 14px; color:var(--ink); font:400 22px/1.3 var(--serif); }
.study-reader-bibliography-list { display:grid; gap:10px; margin:0; padding-left:1.4em; color:var(--muted); font-size:14px; line-height:1.5; }
.study-reader-bibliography-list a { color:var(--muted); text-decoration:underline; text-decoration-color:color-mix(in srgb,var(--muted) 50%,transparent); text-underline-offset:3px; }
.study-reader-bibliography-list a:hover { color:var(--ink); }
.study-reader-bibliography-sections { margin-left:10px; color:color-mix(in srgb,var(--muted) 75%,transparent); font-size:12px; white-space:nowrap; }
.library-material-thumb.is-video { color:var(--ink); background:linear-gradient(145deg,var(--panel-raised),var(--panel)); }
.library-material-type.is-video { color:var(--ink); border-color:var(--line); background:var(--panel-raised); }
.material-video-source { margin:0 0 14px; color:var(--muted); font-size:14px; }
.material-video-source a { color:var(--ink); text-decoration:underline; text-decoration-color:color-mix(in srgb,var(--muted) 55%,transparent); text-underline-offset:3px; }

/* Study cover: the whole card opens reading; the continue button is visually hidden but focusable (28.10.2026). */
.study-page .study-feature.is-clickable { cursor:pointer; }
@media (hover:hover) and (pointer:fine) {
  .study-page .study-feature.is-clickable:hover .study-feature-art img { filter:saturate(.9) brightness(1); }
  .study-page .study-feature.is-clickable:hover .study-feature-copy h2 { color:var(--gold-soft); }
}
.study-page .study-feature-copy .study-feature-actions { margin:0; }
.study-page .study-feature-copy .study-feature-actions .study-feature-continue { position:absolute; width:1px; height:1px; min-height:0; margin:-1px; padding:0; overflow:hidden; clip-path:inset(50%); border:0; background:none; box-shadow:none; text-shadow:none; white-space:nowrap; }
.study-page .study-feature.is-clickable:has(.study-feature-continue:focus-visible) { outline:2px solid var(--gold-soft); outline-offset:3px; border-radius:11px; }
body.pref-high-contrast .study-page .study-feature-copy .study-feature-actions .study-feature-continue {
  background-color:#080c0f;
  background-image:none;
  border-color:#ffe2ba;
  color:#fffdf4;
  box-shadow:inset 0 0 0 1px #ffe2ba;
  text-shadow:none;
}

/* Study header: only the continue action, vertically centred against the title block (28.10.2026). */
@media (min-width:761px) {
  .study-page .study-dashboard-head { align-items:center; }
  .study-page .study-dashboard-tools { align-self:center; align-content:center; }
}

/* Expanded material: grouped head, AI card, disclosure list, footer (28.10.2026). */
.library-material-row.is-expanded .library-material-open svg { transform:rotate(180deg); }
.library-material-detail { gap:22px; padding:18px 14px 6px; }
.library-material-detail > * { min-width:0; }
.library-material-detail-head { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:10px 24px; }
.library-material-detail-head .material-video-source { margin:0; }
.library-material-detail-head .material-storage-actions { display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin:0 0 0 auto; }
.library-material-detail-head .material-storage-actions .material-help { font-size:13px; }
.library-material-detail .material-job-card { display:grid; gap:12px; padding:18px 20px; border:1px solid var(--line); border-radius:8px; background:var(--panel-raised); }
.library-material-detail .material-job-heading { align-items:baseline; }
.library-material-detail .material-job-heading strong { color:var(--ink); font:400 22px/1.2 var(--serif); }
.library-material-detail .material-job-progress { margin:2px 0; }
.material-job-foot { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:10px 20px; }
.material-job-foot .material-help { margin:0; }
.material-job-usage { margin:0; font-variant-numeric:tabular-nums; }
.library-material-detail .material-job-card .material-original { border-top:1px solid var(--line); }
.library-material-detail .material-job-card .material-original > summary { min-height:40px; padding:8px 0 0; }
.library-material-sections { display:grid; border-top:1px solid var(--line); }
.library-material-sections > .material-original { border-bottom:1px solid var(--line); }
.library-material-sections > .material-original > summary { min-height:52px; }
.library-material-sections > .material-original[open] { padding-bottom:16px; }
.library-material-sections > .material-help { margin:12px 0; }
.library-material-detail-foot { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:12px; }
.library-material-detail-foot-main { display:flex; flex-wrap:wrap; align-items:center; gap:10px; }
.library-material-delete { min-height:40px; padding:0 4px; border:0; color:var(--red); background:transparent; font:14px var(--sans); cursor:pointer; touch-action:manipulation; opacity:.85; }
.library-material-delete:hover { opacity:1; text-decoration:underline; text-underline-offset:3px; }
.library-material-delete:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; border-radius:3px; }
@media (max-width:760px) {
  .library-material-detail-head .material-storage-actions { margin-left:0; }
  .library-material-detail .material-job-card { padding:14px; }
}
/* Inside an expanded material, text uses the full card width (28.10.2026). */
.library-material-detail .material-markdown { max-width:none; }
/* Topic sections: air between rows, no bronze "in progress" highlight, quiet read mark (28.10.2026). */
.study-topic-section-list { gap:12px; }
.study-topic-section-row { grid-template-columns:28px 112px minmax(0,1fr) minmax(76px,auto) minmax(32px,auto); }
.study-topic-section-number { font-variant-numeric:lining-nums; }
.study-topic-section-state,.study-topic-section-state.is-done { width:auto; height:auto; min-width:0; justify-content:flex-end; gap:7px; border-radius:0; color:var(--muted); background:none; font:13px var(--sans); }
.study-topic-section-state.is-done { color:var(--green); }
.study-topic-section-row:hover .study-topic-section-state:not(.is-done) { color:var(--gold-soft); }
@media(max-width:900px) { .study-topic-section-row { grid-template-columns:26px 54px minmax(0,1fr) minmax(32px,auto); } }
@media(max-width:480px) { .study-topic-section-row { grid-template-columns:22px 42px minmax(0,1fr); } .study-topic-section-state,.study-topic-section-state.is-done { justify-content:flex-start; font-size:12px; } }
.library-material-detail .material-job-card p { margin:0; }
.library-material-detail .material-job-card .material-original > summary { padding-top:0; }
.library-material-detail .material-job-card > .material-original:first-of-type { margin-top:4px; }
.library-material-detail .material-job-card .material-original[open] { padding-bottom:6px; }
/* Study cover outline: started sections look like unread ones; only read sections are marked (29.10.2026). */
.study-feature-outline-row.is-current { background:transparent; }
.study-feature-outline-row:hover { background:var(--panel-raised); }
.study-feature-outline-row:focus-visible { outline-color:var(--gold-soft); background:var(--panel-raised); }
.study-feature-outline-state.is-current { border-color:var(--line-strong); background:transparent; color:transparent; }
/* Reader as a book: the text takes the space next to the contents instead of a narrow centre column (29.10.2026). */
.study-reader-paragraph { max-width:none; }
@media (min-width:1280px) {
  .study-reader-layout { grid-template-columns:minmax(0,240px) minmax(0,1100px); gap:64px; }
  .study-reader-paragraph { font-size:22px; line-height:1.7; }
}
@media (max-width:1279px) { .study-reader-layout { grid-template-columns:minmax(0,1000px); } }
/* Reader: shift the contents and text 30 px left so the wide text sits closer to the centre (29.10.2026). */
@media (min-width:1280px) { .study-reader-layout { margin-left:-30px; margin-right:30px; } }
/* Timeline event card: short — topic, title, text, related links, one quiet read action (29.10.2026). */
.chrono-detail-related { margin:0; color:var(--muted); font-size:14px; line-height:1.6; }
.chrono-detail-related-link { padding:0; border:0; color:var(--ink); background:none; font:inherit; text-decoration:underline; text-decoration-color:color-mix(in srgb,var(--muted) 50%,transparent); text-underline-offset:3px; cursor:pointer; }
.chrono-detail-related-link:hover { color:var(--gold-soft); }
.chrono-detail-related-link:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; border-radius:2px; }
.chrono-detail-read { justify-self:start; }
.chrono-detail-read { margin-top:10px; }
/* Reader side panel «Кратко» / «Конспект» (web/reader-notes.js, 30.10.2026). Closed by default;
   on wide screens it takes a third column, below 1280 px it slides over the text like the contents. */
.reader-notes { display:flex; flex-direction:column; min-width:0; min-height:0; }
.reader-notes[hidden] { display:none; }
.reader-notes-head { display:flex; align-items:center; justify-content:space-between; gap:12px; padding-bottom:12px; border-bottom:1px solid var(--line); }
.reader-notes-tabs { display:inline-flex; gap:4px; }
.reader-notes-tab { min-height:36px; padding:0 12px; border:0; border-radius:7px; color:var(--muted); background:transparent; font:14px var(--sans); cursor:pointer; }
.reader-notes-tab:hover { color:var(--ink); }
.reader-notes-tab[aria-selected="true"] { color:var(--ink); background:var(--panel-raised); }
.reader-notes-close { width:36px; height:36px; border:0; border-radius:7px; color:var(--muted); background:transparent; font:22px/1 var(--sans); cursor:pointer; }
.reader-notes-close:hover { color:var(--ink); background:var(--panel-raised); }
.reader-notes-tab:focus-visible, .reader-notes-close:focus-visible, .reader-notes-mode-button:focus-visible, .reader-notes-pane:focus-visible { outline:2px solid var(--gold-soft); outline-offset:2px; }
.reader-notes-pane { display:flex; flex:1 1 auto; flex-direction:column; gap:12px; min-height:0; padding-top:16px; overflow:auto; overscroll-behavior:contain; }
.reader-notes-pane[hidden] { display:none; }
.reader-notes-markdown { color:color-mix(in srgb,var(--ink) 94%,var(--muted)); font:400 15px/1.65 var(--sans); overflow-wrap:anywhere; }
.reader-notes-markdown > :first-child { margin-top:0; }
.reader-notes-markdown p, .reader-notes-markdown ul, .reader-notes-markdown ol, .reader-notes-markdown blockquote { margin:0 0 .8em; }
.reader-notes-markdown ul, .reader-notes-markdown ol { padding-left:1.2em; }
.reader-notes-markdown li { margin:0 0 .45em; }
.reader-notes-markdown h1, .reader-notes-markdown h2, .reader-notes-markdown h3 { margin:1em 0 .4em; color:var(--ink); font:400 20px/1.25 var(--serif); }
.reader-notes-markdown blockquote { padding-left:12px; border-left:2px solid var(--line-strong); color:var(--muted); }
.reader-notes-empty { margin:0; color:var(--muted); font-size:14px; line-height:1.55; }
.reader-notes-toolbar { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:8px 12px; }
.reader-notes-mode { display:inline-flex; overflow:hidden; border:1px solid var(--line); border-radius:8px; }
.reader-notes-mode-button { min-height:32px; padding:0 12px; border:0; color:var(--muted); background:transparent; font:13px var(--sans); cursor:pointer; }
.reader-notes-mode-button[aria-pressed="true"] { color:var(--gold-soft); background:var(--accent-surface, var(--panel-raised)); }
.reader-notes-status { margin:0; color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.reader-notes-status.is-error { color:var(--red); }
.reader-notes-text, .reader-notes-preview { flex:1 1 auto; width:100%; min-height:260px; padding:12px 14px; border:1px solid var(--line); border-radius:8px; background:var(--panel); color:var(--ink); font:400 15px/1.6 var(--sans); }
.reader-notes-text { resize:none; }
.reader-notes-text:focus-visible { outline:none; border-color:var(--gold-soft); }
.reader-notes-text::placeholder { color:var(--muted); }
.reader-notes-preview { overflow:auto; }
.reader-notes-preview[hidden], .reader-notes-text[hidden] { display:none; }
.reader-notes-count { margin:0; color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.reader-notes-toggle[aria-expanded="true"] { color:var(--ink); border-color:var(--line-strong); }
.reader-notes-toggle { display:inline-flex; align-items:center; gap:6px; }
.reader-notes-toggle svg { display:none; flex:none; }
@media (max-width:760px) {
  .reader-notes-toggle { width:44px; justify-content:center; padding:0; }
  .reader-notes-toggle svg { display:block; }
  .reader-notes-toggle-label { display:none; }
  .study-reader-back { min-width:72px; }
}
@media (min-width:1280px) {
  .study-reader-layout.has-notes { grid-template-columns:minmax(0,220px) minmax(0,1fr) minmax(320px,380px); gap:48px; }
  .study-reader-layout.has-notes .reader-notes { position:sticky; top:calc(var(--header-height) + 80px); height:calc(calc(100vh / var(--ui-zoom, 1)) - var(--header-height) - 110px); }
}
@media (max-width:1279px) {
  .reader-notes { position:fixed; top:calc(var(--header-height) + 62px); right:var(--reader-gutter, 16px); bottom:16px; z-index:9; width:min(400px,calc(100vw - 32px)); padding:12px 14px 14px; border:1px solid var(--line); border-radius:10px; background:var(--panel-raised); box-shadow:0 16px 40px #000a; }
  .reader-notes .reader-notes-text, .reader-notes .reader-notes-preview { background:var(--panel); }
  .reader-notes-tab[aria-selected="true"] { background:var(--panel); }
}
@media (max-width:600px) {
  .reader-notes { top:auto; right:0; bottom:0; left:0; z-index:30; width:auto; height:min(78vh, 640px); border-radius:12px 12px 0 0; padding-bottom:calc(14px + env(safe-area-inset-bottom)); }
}
@media (prefers-reduced-motion: no-preference) {
  .reader-notes-tab, .reader-notes-close, .reader-notes-mode-button { transition:color .15s ease, background-color .15s ease; }
}