@font-face {
  font-family: Inter;
  src: url("/font-inter") format("truetype");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
:root {
  --color-indigo: #6366f1;
  --color-mist: #f1f5f9;
  --color-cloud: #fff;
  --ground: var(--color-mist);
  --surface: var(--color-cloud);
  --raised: #e9eef5;
  --active: #eeedff;
  --text: #1f2937;
  --muted: #5e6c80;
  --faint: #68758a;
  /* White button labels need slightly more contrast than the reference Indigo. */
  --primary: #5b5fe5;
  --primary-hover: #4e51cf;
  --on-primary: #fff;
  --signal: #5653c9;
  --negative: #b43d53;
  --negative-bg: #fff0f2;
  --warning: #805b18;
  --warning-bg: #fff6e5;
  --border: transparent;
  --control: #b6c0cf;
  --shadow: 0 12px 32px rgb(148 163 184 / 18%);
  --shadow-hover: 0 24px 48px rgb(99 102 241 / 16%);
  --button-shadow: 0 10px 24px rgb(99 102 241 / 25%);
  --focus-ring: 0 0 0 4px rgb(99 102 241 / 20%);
  --radius: 16px;
  --mantine-color-text: var(--text);
  --mantine-color-body: var(--ground);
  --mantine-color-dimmed: var(--muted);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-synthesis: none;
  color: var(--text);
  background: var(--ground);
  color-scheme: light;
}
:root[data-theme="dark"] {
  --ground: #171717;
  --surface: #232323;
  --raised: #303030;
  --active: #353342;
  --text: #ececf1;
  --muted: #b6b5c0;
  --faint: #aaa9b5;
  --primary: #aaa8ff;
  --primary-hover: #bfbdff;
  --on-primary: #262248;
  --signal: #c1beff;
  --negative: #ffb1bf;
  --negative-bg: #39272c;
  --warning: #e8cc94;
  --warning-bg: #343026;
  --control: #696874;
  --shadow: 0 12px 32px rgb(8 8 18 / 20%);
  --shadow-hover: 0 24px 48px rgb(8 8 18 / 32%);
  --button-shadow: 0 8px 24px rgb(120 112 230 / 15%);
  --focus-ring: 0 0 0 4px rgb(170 168 255 / 24%);
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--ground); color: var(--text); font: 14px/1.65 Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: 28px; line-height: 1.3; letter-spacing: -.01em; font-weight: 600; }
h2 { font-size: 20px; font-weight: 600; line-height: 1.4; }
h3 { font-size: 16px; font-weight: 600; line-height: 1.65; }
button, a { touch-action: manipulation; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
svg { width: 20px; height: 20px; flex: none; }
.app-icon { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
a { color: inherit; text-decoration: none; }
.hint, .meta { font-size: 12px; line-height: 1.8; color: var(--muted); }
.form-error { color: var(--negative); font-size: 14px; line-height: 1.8; }
:is(button,a,input,select,textarea,[tabindex]):focus-visible { outline: 2px solid var(--signal); outline-offset: 4px; }
.skip-link { position: fixed; top: -100px; left: 16px; padding: 12px 20px; border-radius: 16px; background: var(--surface); box-shadow: var(--shadow); z-index: 999; }
.skip-link:focus { top: 8px; }
.lecture-app { display: grid; grid-template-columns: 248px minmax(0,1fr); min-height: 100dvh; }
.main-nav { position: sticky; top: 0; height: 100dvh; display: flex; flex-direction: column; padding: 40px 24px 32px; }
.wordmark { display: flex; align-items: center; gap: 12px; min-height: 48px; font-size: 28px; font-weight: 600; letter-spacing: -.01em; }
.wordmark svg { width: 36px; height: 36px; padding: 4px; color: var(--signal); stroke-width: 2; }
.main-nav nav { display: grid; gap: 8px; margin-top: 48px; }
.main-nav nav button, .nav-bottom > button { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 48px; padding: 12px 16px; text-align: left; border: 0; border-radius: 16px; color: var(--muted); background: transparent; transition: background .3s, color .3s, box-shadow .3s; }
.main-nav nav button.active, .nav-bottom > button.active { background: var(--surface); color: var(--signal); font-weight: 600; box-shadow: var(--shadow); }
.main-nav nav button:hover, .nav-bottom > button:hover { color: var(--signal); background: var(--surface); }
.nav-bottom { margin-top: auto; display: grid; gap: 16px; padding-top: 32px; }
.nav-bottom .mantine-NativeSelect-root { max-width: 200px; }
.nav-bottom p { padding: 0 16px; font-size: 12px; color: var(--muted); line-height: 1.9; }
.main-canvas { min-width: 0; padding: 48px 40px 64px; }
.mobile-app-header, .mobile-bottom-nav { display: none; }
.preparation-page, .library-page, .settings-page { max-width: 1200px; margin: 0 auto; }
.page-heading { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 8px 24px; margin-bottom: 32px; }
.page-heading > div { display: contents; }
.page-heading h1 { grid-column: 1; grid-row: 1; }
.page-heading p { grid-column: 1/-1; grid-row: 2; font-size: 14px; line-height: 1.8; color: var(--muted); }
.page-heading > .mantine-Button-root { grid-column: 2; grid-row: 1; }
.preparation-grid { display: grid; grid-template-columns: minmax(0,1.45fr) minmax(280px,1fr); align-items: start; gap: 32px; }
.session-setup, .resume-session, .recent-sessions, .setting-panel, .library-empty, .course-ledger-row, .history-ledger { background: var(--surface); border-radius: 24px; box-shadow: var(--shadow); }
.session-setup { padding: 32px; }
.selected-course { padding: 32px 0 24px; }
.selected-course h2 { font-size: 28px; font-weight: 600; line-height: 1.4; overflow-wrap: anywhere; }
.selected-course > p { color: var(--muted); margin-top: 12px; line-height: 1.8; }
.course-language { display: grid; gap: 8px; margin-top: 24px; font-size: 16px; }
.course-language > span:first-child { font-size: 12px; color: var(--muted); }
.preflight { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 20px; background: var(--ground); border-radius: 16px; color: var(--muted); font-size: 12px; }
.preflight > span { display: flex; align-items: center; gap: 8px; }
.preflight svg { width: 16px; height: 16px; }
.begin-class { width: 100%; margin-top: 24px; }
.billing-hint { margin-top: 16px; color: var(--muted); text-align: center; font-size: 12px; }
.preparation-utilities { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.preparation-side { display: grid; gap: 24px; }
.resume-session, .recent-sessions { padding: 24px; }
.section-caption { font-size: 12px; color: var(--signal); }
.resume-session h2 { margin-top: 12px; }
.resume-session p { margin: 12px 0 24px; color: var(--muted); line-height: 1.8; }
.section-heading { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.section-heading h2 { font-size: 16px; }
.recent-session { width: 100%; padding: 16px; margin-top: 16px; display: grid; gap: 8px; border: 0; border-radius: 16px; text-align: left; background: var(--ground); transition: background .3s, transform .3s; }
.recent-session strong { font-size: 16px; font-weight: 500; color: var(--text); overflow-wrap: anywhere; }
.recent-session > span { font-size: 12px; color: var(--muted); }
.recent-session:hover { background: var(--active); }
small { display: inline-block; font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 8px; white-space: nowrap; }
.empty-inline { margin-top: 24px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.first-course { padding: 32px 0 8px; }
.first-course p { margin: 16px 0 24px; color: var(--muted); line-height: 1.8; }
.language-arrow { padding: 0 4px; }
.course-ledger { display: grid; gap: 24px; }
.course-ledger-row { display: flex; align-items: center; gap: 32px; padding: 32px; transition: transform .5s, box-shadow .5s; }
.course-ledger-copy { flex: 1; min-width: 0; }
.course-ledger-copy h2 { overflow-wrap: anywhere; }
.course-ledger-copy p { margin-top: 12px; color: var(--muted); line-height: 1.8; }
.course-ledger-copy > span { display: block; color: var(--muted); font-size: 12px; line-height: 1.8; margin-top: 16px; }
.course-row-actions { display: flex; align-items: center; gap: 12px; flex: none; }
.library-empty { padding: 32px; max-width: 560px; }
.library-empty p { margin: 16px 0 24px; color: var(--muted); line-height: 1.9; }
.library-filters { display: flex; align-items: center; gap: 24px; margin-bottom: 24px; }
.library-filters .mantine-Select-root { width: 256px; }
.library-filters > span { font-size: 12px; color: var(--muted); }
.history-ledger { padding: 8px; }
.history-ledger:has(.library-empty) { padding: 0; }
.history-ledger .library-empty { box-shadow: none; }
.history-ledger-row { display: flex; align-items: center; gap: 16px; padding: 8px 16px; border-radius: 16px; }
.history-ledger-row + .history-ledger-row { margin-top: 8px; }
.history-ledger-row:hover { background: var(--ground); }
.history-open { display: grid; grid-template-columns: 132px minmax(0,1fr) 80px; align-items: center; gap: 24px; flex: 1; min-width: 0; min-height: 88px; padding: 12px 0; border: 0; background: transparent; text-align: left; }
.history-open > time { font-size: 12px; font-variant-numeric: tabular-nums; color: var(--muted); }
.history-open strong { display: block; font-size: 16px; font-weight: 500; line-height: 1.8; overflow-wrap: anywhere; }
.history-open > span > span { display: block; color: var(--muted); font-size: 12px; line-height: 1.8; margin-top: 8px; }
.history-state { font-size: 12px; color: var(--muted); text-align: right; white-space: nowrap; }
/* The continuous transcript remains still; only action surfaces use lift motion. */
.mode-reader { display: block; height: 100dvh; min-height: 0; padding: 16px 24px; }
.mode-reader .main-canvas { display: flex; flex-direction: column; height: 100%; min-height: 0; padding: 0; }
.lecture-reader { display: flex; flex-direction: column; flex: 1; min-height: 0; width: 100%; max-width: 1200px; margin: 0 auto; background: var(--surface); border-radius: 24px; box-shadow: var(--shadow); overflow: hidden; }
.lecture-header { display: flex; align-items: center; flex: none; gap: 16px; min-height: 96px; padding: 16px 24px; }
.lecture-heading { flex: 1; min-width: 0; }
.lecture-heading h1 { font-size: 20px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader-context { display: flex; align-items: center; gap: 16px; margin-top: 8px; color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader-context > span:last-child { overflow: hidden; text-overflow: ellipsis; }
.lecture-actions { display: flex; align-items: center; gap: 8px; }
.reading-surface { position: relative; display: flex; flex-direction: column; min-height: 0; flex: 1; }
.reading-toolbar { display: flex; justify-content: space-between; align-items: center; flex: none; gap: 16px; min-height: 56px; margin: 0 24px 8px; padding: 4px 16px; border-radius: 16px; background: var(--ground); color: var(--muted); font-size: 12px; }
.reader-count { margin-left: 12px; font-variant-numeric: tabular-nums; }
.reading-options { display: flex; gap: 8px; }
.reading-options svg { width: 16px; height: 16px; }
.transcript-feed { flex: 1; min-height: 0; overflow: auto; overflow-anchor: none; padding: 8px 40px 40px; overscroll-behavior: contain; scrollbar-width: thin; scrollbar-color: var(--control) transparent; scroll-padding: 24px; }
.transcript-feed::after { content: ""; display: block; height: 25%; min-height: 96px; pointer-events: none; }
.sentence { position: relative; display: grid; grid-template-columns: 72px minmax(0,1fr) 44px; gap: 24px; padding: 24px 0 32px; max-width: 1056px; margin: 0 auto; scroll-margin-top: 24px; }
.sentence-time { display: flex; flex-direction: column; gap: 8px; padding-top: 12px; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.sentence-copy { min-width: 0; max-width: 840px; }
.reading-pair + .reading-pair { margin-top: 28px; }
.reading-part-note { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 0 0 12px; }
.reading-pair + .reading-part-note { margin: 16px 0 0; }
.translation { font-size: var(--caption-size,28px); line-height: 1.8; font-weight: 400; color: var(--text); overflow-wrap: anywhere; }
.translation.pending { font-size: 18px; color: var(--muted); }
.translation-reveal { display: flex; flex-direction: column; justify-content: flex-end; }
.translation-ink { display: block; }
.translation-tail { visibility: hidden; user-select: none; }
.translation-tail::after { content: attr(data-text); }
.translation mark { padding-inline: 0; }
.source { margin-top: 12px; color: var(--muted); font-size: var(--source-size,17px); line-height: 1.85; overflow-wrap: anywhere; }
.sentence.is-current .sentence-time > time { color: var(--signal); font-weight: 600; }
.sentence.is-current .sentence-time > time::before { content: ""; display: inline-block; vertical-align: middle; width: 4px; height: 4px; margin-right: 5px; border-radius: 50%; background: currentColor; }
.sentence-mark { color: var(--muted); margin-top: 2px; }
.sentence-mark[aria-pressed="true"] { background: var(--active); color: var(--signal); }
.sentence-mark[aria-pressed="true"] svg { fill: var(--active); }
mark { background: var(--active); color: inherit; padding: 1px 3px; border-radius: 4px; }
.reading-empty { min-height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 32px 16px; }
.reading-empty p { margin-top: 16px; color: var(--muted); line-height: 1.9; }
.capture-bar { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 12px 24px; padding: 20px 32px 16px; flex: none; background: var(--ground); }
.capture-state { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 12px; flex-wrap: wrap; }
.session-state { display: flex; align-items: center; gap: 8px; }
.status-dot { display: inline-block; flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--muted); }
.status-dot.is-running { background: var(--signal); }
.capture-state > time { font-size: 20px; font-variant-numeric: tabular-nums; color: var(--text); }
.save-state { min-width: 7em; color: var(--muted); font-size: 12px; text-align: right; }
.save-state.failed { color: var(--negative); }
.capture-actions { display: flex; justify-content: center; align-items: center; gap: 12px; }
.capture-actions > .primary { min-width: 176px; }
.capture-footnote { grid-column: 1/-1; text-align: center; color: var(--muted); font-size: 12px; line-height: 1.8; }
.demo-notice { margin: 0 24px 16px; padding: 8px 16px; background: var(--warning-bg); color: var(--warning); border-radius: 16px; font-size: 12px; line-height: 1.8; }
.focus-reading .reader-context, .focus-reading .capture-footnote { display: none; }
.focus-reading .lecture-header { min-height: 64px; padding-top: 8px; padding-bottom: 8px; }
.settings-section { display: grid; grid-template-columns: minmax(220px,1fr) minmax(0,1.55fr); gap: 48px; align-items: start; padding: 8px 0 32px; }
.setting-description p { margin-top: 16px; color: var(--muted); line-height: 1.9; max-width: 340px; }
.setting-description .hint { margin-top: 24px; }
.setting-panel { padding: 32px; min-width: 0; }
.connection-state { display: flex; align-items: center; gap: 8px; margin-bottom: 24px; color: var(--muted); font-size: 12px; }
.privacy-note { padding: 16px; margin-top: 24px; background: var(--ground); border-radius: 16px; }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.message { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 16px 24px; margin-bottom: 24px; border-radius: 16px; background: var(--surface); box-shadow: var(--shadow); line-height: 1.8; }
.error-message { color: var(--negative); background: var(--negative-bg); }
.mode-reader .message { max-width: 1200px; width: 100%; margin: 0 auto 12px; flex: none; }
.file-label { position: relative; display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 24px; border-radius: 16px; background: var(--raised); cursor: pointer; overflow: hidden; }
.file-label input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.file-label:focus-within { outline: 2px solid var(--signal); outline-offset: 4px; }
.tools-content { display: grid; gap: 32px; }
.tools-content section + section { padding-top: 8px; }
.tools-content section > p { margin: 12px 0 16px; color: var(--muted); line-height: 1.8; }
.marked-link { display: block; width: 100%; padding: 16px; margin-top: 8px; border: 0; border-radius: 16px; background: var(--ground); text-align: left; line-height: 1.8; }
.dialog-form { display: grid; gap: 24px; }
.field { display: grid; gap: 8px; }
.field input { min-height: 48px; min-width: 0; padding: 12px 20px; border: 0; border-radius: 16px; background: var(--ground); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 16px; margin-top: 24px; }
.dialog-copy { padding: 8px 0; color: var(--muted); line-height: 1.9; }
.dialog-actions button { min-height: 48px; padding: 12px 24px; background: var(--ground); border: 0; border-radius: 16px; }
.dialog-actions .danger { color: var(--negative); background: var(--negative-bg); }
.loading, .boot { padding: 40px; color: var(--muted); }
.fatal { max-width: 560px; margin: 12vh auto; padding: 32px; }
.fatal p { margin: 16px 0; color: var(--muted); line-height: 1.8; }
.fatal button { padding: 12px 24px; border: 0; border-radius: 16px; background: var(--primary); color: var(--on-primary); }
/* Shared Soft UI styles keep library controls consistent across every view. */
.mantine-Button-root, .mantine-ActionIcon-root { height: 48px; min-height: 48px; border: 0; border-radius: 16px; font-weight: 500; transition: background .3s ease, box-shadow .3s ease, transform .3s ease; }
.mantine-Button-root { padding-inline: 20px; font-size: 14px; }
.mantine-ActionIcon-root { height: 44px; min-height: 44px; }
.mantine-Button-label { height: auto; gap: 8px; line-height: 1.4; text-box-trim: none; }
.mantine-Button-section { align-self: center; }
.mantine-Button-root.primary { font-size: 16px; }
.mantine-Input-wrapper { --input-height: 48px; }
.mantine-Input-input { padding-inline-start: var(--input-padding-inline-start); padding-inline-end: var(--input-padding-inline-end); }
.mantine-Input-wrapper[data-with-right-section] .mantine-Input-input { padding-inline-end: 48px; }
.mantine-Switch-body { min-height: 44px; align-items: center; }
.reading-options .mantine-Button-root { height: 44px; min-height: 44px; }
.lecture-actions .mantine-Button-root, .back-to-home { width: 44px; min-width: 44px; height: 44px; min-height: 44px; padding: 0; }
.lecture-actions #tools-toggle { width: auto; padding-inline: 16px; }
.mantine-Button-root[data-variant="filled"], .mantine-Button-root.primary { color: var(--on-primary); background: var(--primary); box-shadow: var(--button-shadow); }
.mantine-Button-root[data-variant="default"], .mantine-ActionIcon-root[data-variant="default"] { background: var(--raised); color: var(--text); }
.mantine-Button-root[data-variant="subtle"], .mantine-ActionIcon-root[data-variant="subtle"] { color: var(--muted); }
.mantine-Button-root[data-variant="subtle"][aria-pressed="true"] { background: var(--active); color: var(--signal); }
.mantine-Button-root:not(:disabled):active, .mantine-ActionIcon-root:not(:disabled):active { transform: scale(.96); box-shadow: inset 0 4px 10px rgb(67 56 202 / 16%); }
.mantine-Button-root:disabled, .mantine-ActionIcon-root:disabled { color: var(--muted); background: var(--raised); box-shadow: none; opacity: .65; }
.mantine-Button-root[data-loading] { opacity: .8; }
.mantine-Input-input { min-height: 48px; padding-inline: 20px; background: var(--ground); color: var(--text); border: 0; border-radius: 16px; font-size: 14px; transition: box-shadow .3s, background .3s; }
.mantine-Input-input::placeholder { color: var(--faint); }
.mantine-Input-input:focus, .mantine-Input-input:focus-within { background: var(--surface); box-shadow: var(--focus-ring), 0 10px 26px rgb(99 102 241 / 10%); }
.mantine-Input-input[aria-invalid="true"] { box-shadow: 0 0 0 2px var(--negative); }
.mantine-InputWrapper-label { font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 8px; }
.mantine-InputWrapper-description { color: var(--muted); font-size: 12px; line-height: 1.8; margin: 0 0 8px; }
.language-picker { min-width: 0; border: 0; padding: 0; margin: 0; }
.language-picker legend { font-size: 14px; font-weight: 500; }
.language-picker-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.language-picker-heading .hint { margin: 0; }
.language-picker-heading .mantine-Button-root { height: 44px; min-height: 44px; padding-inline: 12px; flex-shrink: 0; }
.language-grid, .choice-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.language-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
.language-grid .mantine-Chip-root { min-width: 0; position: relative; }
.language-grid .mantine-Chip-input { position: absolute; }
.language-grid .mantine-Chip-label { position: relative; display: flex; justify-content: center; width: 100%; height: auto; min-height: 48px; padding: 12px 24px; border: 0; border-radius: 16px; background: var(--ground); color: var(--text); font-size: 14px; line-height: 1.5; white-space: normal; overflow-wrap: anywhere; text-align: center; text-box-trim: none; }
.language-grid .mantine-Chip-label[data-checked] { background: var(--active); color: var(--signal); box-shadow: inset 0 0 0 1px var(--signal); }
.language-grid .mantine-Chip-iconWrapper { position: absolute; inset-inline-start: 8px; width: 12px; max-width: 12px; }
.language-grid .mantine-Chip-checkIcon { color: var(--signal); }
.language-grid .mantine-Chip-label[data-disabled] { background: var(--ground); color: var(--muted); opacity: .55; cursor: not-allowed; }
.language-grid .mantine-Chip-input:focus-visible + label { outline: 2px solid var(--signal); outline-offset: 2px; }
.choice-grid { margin-top: 8px; }
.choice-card { display: flex; align-items: center; gap: 12px; min-width: 0; min-height: 48px; padding: 16px; background: var(--ground); color: var(--text); border-radius: 16px; }
.choice-card > .mantine-RadioIndicator-indicator { flex-shrink: 0; }
.choice-title, .choice-description { display: block; line-height: 1.6; overflow-wrap: anywhere; }
.choice-title { font-size: 14px; font-weight: 500; }
.choice-description { margin-top: 4px; font-size: 12px; color: var(--muted); }
.choice-card[data-checked] { background: var(--active); box-shadow: inset 0 0 0 1px var(--signal); }
.choice-card[aria-invalid="true"] { outline: 2px solid var(--negative); }
.choice-card:disabled { opacity: .55; cursor: not-allowed; }
.theme-options .mantine-SegmentedControl-label { padding: 8px 4px; font-size: 14px; white-space: normal; }
.mantine-Pill-root { background: var(--active); color: var(--signal); border-radius: 16px; }
.mantine-Select-dropdown, .mantine-MultiSelect-dropdown, .mantine-Menu-dropdown, .mantine-Popover-dropdown { padding: 8px; border: 0; border-radius: 20px; background: var(--surface); color: var(--text); box-shadow: var(--shadow-hover); }
.mantine-Popover-dropdown:has(.mantine-Stack-root) { padding: 24px; }
.mantine-Select-option, .mantine-MultiSelect-option, .mantine-Menu-item { min-height: 44px; border-radius: 16px; padding: 12px 16px; }
.mantine-Select-option[data-checked], .mantine-MultiSelect-option[data-checked], .mantine-Select-option[data-combobox-selected], .mantine-MultiSelect-option[data-combobox-selected], .mantine-Menu-item[data-hovered] { background: var(--active); color: var(--signal); }
.mantine-Menu-item[data-danger] { color: var(--negative); }
.mantine-Switch-track { min-width: 44px; min-height: 24px; border-color: transparent; }
.mantine-Switch-input:checked + .mantine-Switch-track { background: var(--primary); border-color: transparent; }
.mantine-Tabs-list { width: fit-content; max-width: 100%; padding: 6px; gap: 4px; background: var(--raised); border-radius: 20px; margin-bottom: 32px; }
.mantine-Tabs-list::before { display: none; }
.mantine-Tabs-tab { min-height: 44px; border: 0; border-radius: 16px; padding: 10px 20px; font-size: 14px; color: var(--muted); }
.mantine-Tabs-tab[data-active] { background: var(--surface); color: var(--signal); box-shadow: var(--shadow); }
.mantine-Accordion-root { display: grid; gap: 16px; }
.mantine-Accordion-item { border: 0; border-radius: 16px; background: var(--ground); }
.mantine-Accordion-control { min-height: 48px; border-radius: 16px; font-size: 14px; }
.app-dialog { border-radius: 24px; background: var(--surface); color: var(--text); box-shadow: var(--shadow-hover); }
.app-dialog-header { padding: 24px 32px 16px; background: var(--surface); }
.app-dialog-header .mantine-Modal-title { font-size: 20px; font-weight: 600; }
.app-dialog-body { padding: 8px 32px 32px; }
.mantine-Modal-close, .mantine-Drawer-close { min-width: 44px; min-height: 44px; border-radius: 16px; color: var(--muted); }
.mantine-SegmentedControl-root { max-width: 100%; padding: 6px; border-radius: 20px; background: var(--raised); }
.mantine-SegmentedControl-label { min-height: 44px; display: flex; align-items: center; justify-content: center; color: var(--muted); }
.mantine-SegmentedControl-label[data-active] { color: var(--signal); }
.mantine-SegmentedControl-indicator { background: var(--surface); border-radius: 16px; box-shadow: var(--shadow); }
.mantine-Drawer-content, .mantine-Drawer-header { background: var(--ground); color: var(--text); }
@media (hover:hover) {
  .language-grid .mantine-Chip-label:not([data-disabled]):hover { background: var(--raised); }
  .language-grid .mantine-Chip-label[data-checked]:not([data-disabled]):hover { background: var(--active); }
  .mantine-Button-root:not(:disabled):hover { transform: translateY(-4px); }
  .mantine-Button-root[data-variant="filled"]:not(:disabled):hover, .mantine-Button-root.primary:not(:disabled):hover { background: var(--primary-hover); box-shadow: 0 18px 32px rgb(99 102 241 / 28%); }
  .mantine-Button-root[data-variant="subtle"]:not(:disabled):hover, .mantine-ActionIcon-root:not(:disabled):hover { background: var(--active); color: var(--signal); }
  .course-ledger-row:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
}
@media (max-width:1100px) {
  .lecture-app { grid-template-columns: 224px minmax(0,1fr); }
  .main-nav { padding: 32px 16px; }
  .main-canvas { padding: 40px 24px; }
  .preparation-grid { grid-template-columns: 1fr; }
  .preparation-side { grid-template-columns: 1fr 1fr; }
  .settings-section { grid-template-columns: 1fr; gap: 24px; }
  .setting-description p { max-width: 560px; }
  .history-open { grid-template-columns: 112px minmax(0,1fr) 72px; gap: 16px; }
  .mode-reader { display: block; }
  .capture-state { gap: 12px 24px; }
  .save-state { width: 100%; }
}
@media (max-width:860px) {
  :root { scroll-padding-block: 16px calc(88px + env(safe-area-inset-bottom)); }
  .lecture-app { display: block; }
  .main-nav { display: none; }
  .mobile-app-header { display: flex; justify-content: space-between; align-items: center; min-height: 56px; padding: 8px 24px 0; }
  .mobile-app-header .wordmark { font-size: 24px; }
  .main-canvas { padding: 24px 24px calc(104px + env(safe-area-inset-bottom)); }
  .preparation-grid { grid-template-columns: minmax(0,1fr) minmax(240px,.85fr); gap: 24px; }
  .preparation-side { grid-template-columns: 1fr; }
  .session-setup, .course-ledger-row { padding: 24px; }
  .course-ledger-row { gap: 24px; }
  .history-open { grid-template-columns: 100px minmax(0,1fr) 64px; }
  .mode-reader { padding: 12px; }
  .mode-reader .main-canvas { padding: 0; }
  .lecture-header { padding: 16px; gap: 8px; }
  .transcript-feed { padding-inline: 24px; }
  .sentence { gap: 16px; }
  .reading-toolbar { margin-inline: 16px; }
  .capture-bar { padding-inline: 24px; }
  .mobile-bottom-nav { position: fixed; inset: auto 0 0; z-index: 50; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); padding: 8px 12px calc(8px + env(safe-area-inset-bottom)); background: var(--surface); box-shadow: 0 -8px 32px rgb(148 163 184 / 14%); }
  .mobile-bottom-nav button { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; min-height: 52px; padding: 4px; border: 0; border-radius: 16px; background: transparent; color: var(--muted); font-size: 12px; line-height: 1.4; }
  .mobile-bottom-nav button[aria-current="page"] { color: var(--signal); background: var(--active); font-weight: 600; }
}
@media (max-width:640px) {
  h1 { font-size: 24px; }
  .mobile-app-header { padding: max(8px,env(safe-area-inset-top)) 16px 0; }
  .main-canvas { padding: 16px 16px calc(96px + env(safe-area-inset-bottom)); }
  .page-heading { gap: 8px 16px; margin-bottom: 24px; }
  .page-heading p { font-size: 14px; }
  .page-heading > .mantine-Button-root { padding-inline: 16px; }
  .preparation-grid, .preparation-side { grid-template-columns: 1fr; gap: 24px; }
  .session-setup, .resume-session, .recent-sessions, .setting-panel, .library-empty { padding: 20px; }
  .selected-course { padding: 16px 0; }
  .selected-course h2 { display: none; }
  .selected-course > p { margin-top: 0; font-size: 14px; }
  .course-language { margin-top: 16px; font-size: 14px; }
  .begin-class { margin-top: 20px; }
  .billing-hint { margin-top: 12px; }
  .first-course { padding-top: 24px; }
  .first-course > .mantine-Button-root { width: 100%; }
  .preflight { padding: 16px; gap: 12px; }
  .preparation-utilities { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
  .preparation-utilities .mantine-Button-root { padding-inline: 0; font-size: 14px; }
  .course-ledger-row { flex-wrap: wrap; gap: 24px; padding: 24px; }
  .course-ledger-copy { flex-basis: 100%; }
  .course-row-actions { width: 100%; justify-content: space-between; }
  .history-ledger-row { gap: 8px; padding: 8px 12px; }
  .history-open { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
  .history-open > span > span { margin-top: 4px; }
  .history-state { text-align: left; }
  .library-filters { gap: 16px; }
  .library-filters .mantine-Select-root { flex: 1; min-width: 0; width: auto; }
  .mode-reader { min-height: 0; height: 100dvh; padding: 0; }
  .lecture-reader { border-radius: 0; box-shadow: none; }
  .lecture-header { min-height: 68px; padding: max(8px,env(safe-area-inset-top)) 8px 8px; gap: 4px; }
  .lecture-heading h1 { font-size: 18px; }
  .reader-context { display: block; margin-top: 4px; }
  .reader-context > span:last-child { display: none; }
  .lecture-actions { gap: 0; }
  .lecture-actions #tools-toggle { width: 44px; padding-inline: 0; }
  .lecture-actions #tools-toggle .mantine-Button-label > span { display: none; }
  .reading-toolbar { min-height: 44px; margin: 0 12px 4px; padding: 0 8px; gap: 4px; }
  .reader-count { display: none; }
  .reading-options { gap: 0; }
  .reading-options .mantine-Button-root { padding-inline: 8px; font-size: 14px; }
  .reading-options .mantine-Button-section { margin-inline-end: 4px; }
  .transcript-feed { padding: 0 20px 24px; scroll-padding: 12px; }
  .sentence { grid-template-columns: minmax(0,1fr) 44px; gap: 0; padding: 8px 0 16px; scroll-margin-top: 12px; }
  .sentence-time { grid-column: 1; flex-direction: row; align-items: center; gap: 12px; min-height: 44px; padding-top: 0; }
  .sentence-copy { grid-column: 1/-1; grid-row: 2; }
  .sentence-mark { grid-column: 2; grid-row: 1; margin: 0; }
  .translation { line-height: 1.65; }
  .source { margin-top: 12px; line-height: 1.7; }
  .capture-bar { display: block; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); }
  .capture-state { justify-content: space-between; gap: 8px; }
  .capture-state > time { font-size: 16px; }
  .save-state { width: auto; }
  .capture-actions { gap: 12px; margin-top: 8px; }
  .capture-actions > .primary { min-width: 0; flex: 1; }
  .capture-actions > .mantine-Button-root:not(.primary) { min-width: 72px; }
  .capture-footnote { display: none; }
  .is-capturing .capture-footnote { display: block; margin-top: 8px; font-size: 12px; }
  .demo-notice { margin: 0 12px 12px; padding: 8px 12px; }
  .settings-section { gap: 16px; }
  .setting-description p { margin-top: 8px; }
  .setting-description h2 { font-size: 18px; }
  .setting-panel .mantine-Group-root > .mantine-Button-root { flex: 1; }
  .setting-panel .mantine-SegmentedControl-root { width: 100%; }
  .connection-state { margin-bottom: 16px; }
  .field-pair { grid-template-columns: 1fr; }
  .language-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .choice-grid { grid-template-columns: 1fr; }
  .mantine-Input-input { font-size: 16px; }
  .mantine-Tabs-tab { flex: 1; min-width: 0; padding-inline: 8px; }
  .mantine-Tabs-list { width: 100%; margin-bottom: 24px; flex-wrap: nowrap; }
  .app-dialog { border-radius: 0; scroll-padding-block: 80px 96px; }
  .app-dialog :is(input,button,label,textarea) { scroll-margin-block: 80px 96px; }
  .app-dialog-header { position: sticky; top: 0; z-index: 5; }
  .app-dialog-body { padding-bottom: calc(20px + env(safe-area-inset-bottom)); }
  .course-editor-actions { position: sticky; bottom: 0; z-index: 2; background: var(--surface); padding: 12px 0; }
  .course-editor-actions > .mantine-Button-root { flex: 1; }
  .app-dialog-header { padding: calc(16px + env(safe-area-inset-top)) 24px 12px; }
  .app-dialog-body { padding: 8px 24px calc(24px + env(safe-area-inset-bottom)); }
  .message { flex-wrap: wrap; padding: 16px; }
  .mode-reader .message { width: calc(100% - 24px); margin: 8px 12px; }
  .dialog-actions { gap: 12px; }
  .dialog-actions > button { flex: 1; }
}
@media (max-height:600px) and (orientation:landscape) {
  .mode-reader { padding: 0; }
  .lecture-reader { border-radius: 0; }
  .lecture-header { min-height: 60px; padding: 4px max(16px,env(safe-area-inset-right)) 4px max(16px,env(safe-area-inset-left)); }
  .reader-context { display: none; }
  .reading-toolbar { min-height: 44px; padding-block: 0; margin-bottom: 4px; }
  .capture-bar { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 8px 16px; padding: 8px 16px; }
  .capture-state { justify-content: flex-start; }
  .save-state { width: auto; }
  .capture-actions { margin-top: 0; }
  .capture-footnote, .is-capturing .capture-footnote { display: none; }
}
@media (prefers-reduced-motion:reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .mantine-Button-root, .mantine-ActionIcon-root, .course-ledger-row { transform: none !important; }
}