@font-face { font-family: 'Atkinson Hyperlegible'; font-weight: 400; font-display: swap; src: url('fonts/AtkinsonHyperlegible-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'Atkinson Hyperlegible'; font-weight: 700; font-display: swap; src: url('fonts/AtkinsonHyperlegible-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'Crimson Pro'; font-weight: 700; font-display: swap; src: url('fonts/CrimsonPro-700-normal.woff2') format('woff2'); }

/* ---------- Tokens (same palette as the notes PDFs) ---------- */
:root {
  color-scheme: light;
  --bg: #F1F5F9; --surface: #FFFFFF; --soft: #F8FAFC;
  --ink: #0F172A; --ink-2: #334155; --muted: #64748B; --line: #E2E8F0;
  --pri: #2563EB; --pri-ink: #1E40AF; --pri-soft: #EFF6FF; --on-pri: #FFFFFF;
  --ok: #047857; --ok-soft: #ECFDF5;
  --viewer: #CBD5E1;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0B1220; --surface: #111A2E; --soft: #17223A;
    --ink: #E2E8F0; --ink-2: #CBD5E1; --muted: #94A3B8; --line: #22304A;
    --pri: #60A5FA; --pri-ink: #93C5FD; --pri-soft: #172554; --on-pri: #0B1220;
    --ok: #34D399; --ok-soft: #052E26;
    --viewer: #1E293B;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: 'Atkinson Hyperlegible', system-ui, -apple-system, sans-serif; line-height: 1.45; }
a { color: inherit; }
button { font: inherit; color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid var(--pri); outline-offset: 2px; }
[hidden] { display: none !important; }
.serif { font-family: 'Crimson Pro', Georgia, serif; }
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.icon.solid { fill: currentColor; stroke: none; }

/* ---------- Home ---------- */
.home { max-width: 720px; margin: 0 auto; padding: 28px 16px 40px; }
.brand { font-weight: 700; font-size: 15px; color: var(--muted); margin: 0 0 4px; }
.home > header h1 { font-family: 'Crimson Pro', Georgia, serif; font-size: 36px; line-height: 1.05; margin: 0 0 6px; }
.home > header p { margin: 0; color: var(--ink-2); }
.note { margin: 16px 0 0; padding: 10px 12px; border-radius: 10px; background: var(--pri-soft); color: var(--pri-ink); font-size: 14px; }
.subjects { display: grid; gap: 12px; margin-top: 22px; }
.subject { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.subject h2 { margin: 0; font-size: 19px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.subject h2 small { font-size: 14px; font-weight: 400; color: var(--muted); }
.subject .soon-text { margin: 4px 0 0; color: var(--muted); font-size: 14px; }
.mods { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.mod { display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 0 14px; border-radius: 999px; border: 1.5px solid var(--pri); color: var(--pri-ink); background: var(--surface); font-weight: 700; font-size: 15px; text-decoration: none; }
a.mod:hover { background: var(--pri-soft); }
.mod.soon { border-color: var(--line); color: var(--muted); font-weight: 400; border-style: dashed; }
.mod .saved { color: var(--ok); display: inline-flex; }
.mod .saved .icon { width: 16px; height: 16px; stroke-width: 3; }
.home > footer { margin-top: 26px; color: var(--muted); font-size: 13.5px; }
.home > footer p { margin: 4px 0; }

/* ---------- Module page ---------- */
body.module { height: 100vh; height: 100dvh; overflow: hidden; display: grid;
  grid-template-columns: minmax(0, 1fr) 360px; grid-template-rows: auto minmax(0, 1fr) auto;
  grid-template-areas: "top top" "viewer panel" "viewer player"; }

.top { grid-area: top; display: flex; align-items: center; gap: 10px; padding: 8px 12px; padding-top: max(8px, env(safe-area-inset-top)); background: var(--surface); border-bottom: 1px solid var(--line); min-width: 0; }
.back, .icon-btn { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; border: 0; background: none; text-decoration: none; color: var(--ink-2); flex: none; cursor: pointer; }
.back:hover, .icon-btn:hover { background: var(--soft); }
.top .titles { min-width: 0; flex: 1; }
.top .kicker { font-size: 12px; color: var(--muted); font-weight: 700; letter-spacing: .04em; }
.top h1 { margin: 0; font-size: 17px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.pill { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 12px; border-radius: 999px; border: 1.5px solid var(--pri); background: var(--surface); color: var(--pri-ink); font-weight: 700; font-size: 13.5px; cursor: pointer; white-space: nowrap; flex: none; }
.pill .icon { width: 17px; height: 17px; }
.pill[data-state="saved"] { border-color: var(--ok); color: var(--ok); background: var(--ok-soft); }
.pill[data-state="saving"] { cursor: progress; }
.pill:disabled { opacity: .6; }

/* PDF viewer */
.viewer { grid-area: viewer; position: relative; min-height: 0; min-width: 0; background: var(--viewer); }
.scroller { position: absolute; inset: 0; overflow: auto; -webkit-overflow-scrolling: touch; touch-action: pan-x pan-y; overscroll-behavior: contain; }
.pages { padding: 10px; display: flex; flex-direction: column; align-items: center; gap: 10px; transform-origin: 0 0; }
.page { background: #fff; box-shadow: 0 1px 3px rgba(15, 23, 42, .25); position: relative; flex: none; }
.page canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.viewer-msg { position: absolute; inset: 0; display: grid; place-items: center; padding: 24px; text-align: center; color: var(--ink-2); }
.float { position: absolute; display: flex; gap: 6px; z-index: 2; opacity: 0; pointer-events: none; transition: opacity .25s; }
/* Zoom buttons and page number fade out like Chrome's PDF viewer; a tap, click or mouse move brings them back */
.viewer.show-zoom .float.zoom { opacity: 1; pointer-events: auto; }
.viewer.show-pageno .float.pageno { opacity: 1; }
/* --sbw / --sbh: scrollbar sizes, set from module.js, so the buttons never sit on a visible scrollbar */
.float.zoom { right: calc(12px + var(--sbw, 0px)); bottom: calc(12px + var(--sbh, 0px)); }
.float.pageno { left: 12px; bottom: calc(12px + var(--sbh, 0px)); pointer-events: none; }
.chip-btn { min-width: 40px; height: 40px; padding: 0 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); display: grid; place-items: center; cursor: pointer; box-shadow: 0 1px 4px rgba(15, 23, 42, .18); font-weight: 700; font-size: 13px; }
.chip-btn:disabled { opacity: .45; cursor: default; }
.pageno span { background: rgba(15, 23, 42, .72); color: #fff; font-size: 13px; font-weight: 700; padding: 5px 10px; border-radius: 999px; font-variant-numeric: tabular-nums; }

/* Parts panel: right column on wide screens, a sheet over the PDF on phones */
.panel { grid-area: panel; background: var(--surface); border-left: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.panel-head h2 { margin: 0; font-size: 15px; }
.close-sheet { display: none; }
.seg { display: inline-flex; background: var(--soft); border: 1px solid var(--line); border-radius: 10px; padding: 3px; gap: 3px; }
.seg button { border: 0; border-radius: 8px; padding: 0 12px; min-height: 32px; background: transparent; color: var(--ink-2); font-weight: 700; font-size: 13.5px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--pri); color: var(--on-pri); }
ol.tracks { list-style: none; margin: 0; padding: 10px; overflow-y: auto; flex: 1; min-height: 0; }
.tracks li + li { margin-top: 6px; }
.track { width: 100%; display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: start; text-align: left; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; cursor: pointer; }
.track:hover { background: var(--soft); }
.track[aria-current="true"] { background: var(--pri-soft); border-color: var(--pri); }
.track .n { width: 30px; height: 30px; border-radius: 50%; background: var(--ink-2); color: var(--surface); display: grid; place-items: center; font-weight: 700; font-size: 13px; }
.track[aria-current="true"] .n { background: var(--pri); color: var(--on-pri); }
.track.done .n { background: var(--ok); color: var(--surface); }
.track .t { font-weight: 700; font-size: 14.5px; line-height: 1.3; }
.track .m { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.offline-box { padding: 12px 14px 0; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.offline-box p { margin: 0 0 8px; }
.offline-box > :last-child { margin-bottom: 0; }
.credit { margin: 0; padding: 10px 14px 12px; font-size: 12px; line-height: 1.4; color: var(--muted); opacity: .85; }
.offline-box[hidden] + .credit { border-top: 1px solid var(--line); }
.link-btn { border: 0; background: none; padding: 0; color: var(--pri-ink); font-weight: 700; text-decoration: underline; cursor: pointer; font-size: 13px; }

/* Player */
.player { grid-area: player; background: var(--surface); border-left: 1px solid var(--line); border-top: 1px solid var(--line); padding: 10px 14px 12px; padding-bottom: max(12px, env(safe-area-inset-bottom)); }
.now { display: flex; align-items: center; gap: 10px; width: 100%; border: 0; background: none; padding: 0; text-align: left; cursor: default; }
.now .parts-icon { display: none; }
.now .nt { min-width: 0; flex: 1; }
.now b { display: block; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.now small { display: block; font-size: 12.5px; color: var(--muted); }
.seek { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 8px; margin-top: 8px; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.seek input { width: 100%; accent-color: var(--pri); margin: 0; height: 24px; }
.controls { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-top: 6px; }
.ctl { width: 44px; height: 44px; border-radius: 50%; border: 0; background: none; color: var(--ink-2); display: grid; place-items: center; cursor: pointer; }
.ctl:hover { background: var(--soft); }
.ctl:disabled { opacity: .35; cursor: default; background: none; }
.ctl.play { width: 52px; height: 52px; background: var(--pri); color: var(--on-pri); }
.ctl.play:hover { background: var(--pri-ink); }
.ctl.play .icon { width: 22px; height: 22px; }
.speed-btn { min-width: 54px; height: 36px; border-radius: 999px; border: 1px solid var(--line); background: var(--soft); font-weight: 700; font-size: 13.5px; color: var(--ink-2); cursor: pointer; font-variant-numeric: tabular-nums; }

@media (max-width: 860px) {
  body.module { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr) auto; grid-template-areas: "top" "viewer" "player"; }
  .top h1 { font-size: 15.5px; }
  .panel { grid-area: viewer; align-self: end; z-index: 5; max-height: 78%; border-left: 0; border-top: 1px solid var(--line); border-radius: 16px 16px 0 0; box-shadow: 0 -8px 30px rgba(15, 23, 42, .25); display: none; }
  body.sheet-open .panel { display: flex; }
  .close-sheet { display: grid; }
  .player { border-left: 0; padding: 8px 12px 10px; padding-bottom: max(10px, env(safe-area-inset-bottom)); }
  .now { cursor: pointer; }
  .now .parts-icon { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--soft); border: 1px solid var(--line); color: var(--ink-2); flex: none; }
  .ctl { width: 42px; height: 42px; }
}
@media (max-width: 360px) {
  .pill .label { display: none; }
  .pill { padding: 0 10px; }
}

.spin { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spin { animation: none; } .float { transition: none; } }

/* Speed slider, opened from the speed button */
.speed-pop { position: fixed; z-index: 20; width: 290px; max-width: calc(100vw - 16px); display: flex; align-items: center; gap: 8px; padding: 8px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 8px 30px rgba(15, 23, 42, .25); }
.speed-pop input { flex: 1; min-width: 0; accent-color: var(--pri); }
.speed-pop output { min-width: 46px; text-align: right; font-weight: 700; color: var(--pri-ink); font-variant-numeric: tabular-nums; }
.speed-pop .chip-btn { box-shadow: none; font-size: 18px; }

/* Focus mode: header hidden, player shrunk to a strip, audio keeps playing */
.badge { display: none; width: 32px; height: 32px; border-radius: 50%; background: var(--ink-2); color: var(--surface); place-items: center; font-weight: 700; font-size: 13px; flex: none; }
.player .expand { display: none; }
body.focus .top { display: none; }
body.focus .player .expand { display: grid; }

@media (min-width: 861px) {
  body.module.focus { grid-template-columns: minmax(0, 1fr) 64px; grid-template-rows: minmax(0, 1fr); grid-template-areas: "viewer player"; }
  body.focus .panel, body.focus .seek, body.focus .now .nt { display: none; }
  body.focus .player { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 12px 0; border-top: 0; }
  body.focus .now { width: auto; justify-content: center; }
  body.focus .badge { display: grid; }
  body.focus .controls { flex-direction: column; margin: 0; gap: 8px; }
  body.focus .ctl.play { order: -1; }
  body.focus .speed-btn { order: 9; min-width: 50px; padding: 0 4px; }
}
@media (max-width: 860px) {
  body.module.focus { grid-template-rows: minmax(0, 1fr) auto; grid-template-areas: "viewer" "player"; }
  body.focus .player { display: flex; align-items: center; gap: 6px; padding: 6px 10px; padding-bottom: max(6px, env(safe-area-inset-bottom)); }
  body.focus .now { flex: 1; min-width: 0; }
  body.focus .now .parts-icon, body.focus .now small, body.focus .seek, body.focus #fwd10, body.focus #next { display: none; }
  body.focus .badge { display: grid; }
  body.focus .controls { margin: 0; gap: 2px; }
  body.focus .ctl.play { width: 44px; height: 44px; }
}