/* ---------------------------------------------------------------- tokens */
:root {
  --bg: #faf8f4;
  --bg-soft: #f2eee7;
  --surface: #ffffff;
  --ink: #1b1a18;
  --ink-soft: #4a453f;
  --muted: #857c72;
  --line: #e6e0d6;
  --accent: #b45309;
  --accent-soft: #fdf3e7;
  --accent-ink: #8a3f06;
  --shadow: 0 1px 2px rgba(30, 25, 20, .05), 0 8px 24px -12px rgba(30, 25, 20, .18);
  --radius: 14px;
  --serif: "Charter", "Iowan Old Style", Georgia, "Noto Serif", "Songti SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a;
    --bg-soft: #1d1c22;
    --surface: #201f26;
    --ink: #f1ece4;
    --ink-soft: #cdc6bb;
    --muted: #948c81;
    --line: #322f39;
    --accent: #f0a04b;
    --accent-soft: #2a2018;
    --accent-ink: #f6c08a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px -16px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 820px; margin: 0 auto; padding: 0 18px; }

/* ---------------------------------------------------------------- header */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { display: flex; align-items: center; gap: 12px; height: 58px; }

.brand { display: flex; align-items: baseline; gap: 8px; font-weight: 650; letter-spacing: -.01em; white-space: nowrap; min-width: 0; }
.brand .mark { color: var(--accent); font-size: 20px; }
.brand small { color: var(--muted); font-weight: 450; font-size: 12px; letter-spacing: .04em; }

.iconbtn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface);
  cursor: pointer; color: var(--ink-soft);
  transition: background .15s, color .15s, border-color .15s;
}
.iconbtn:hover { color: var(--accent); border-color: var(--accent); }
.iconbtn svg { width: 18px; height: 18px; }
.spacer { flex: 1; }
.lang-sel {
  font: inherit; font-size: 12.5px; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 8px; cursor: pointer;
  max-width: 9.5em;
}
.lang-sel:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------- hero */
.hero { padding: 34px 0 18px; }
.hero h1 {
  font-family: var(--serif); font-weight: 600; letter-spacing: -.02em;
  font-size: clamp(28px, 6vw, 40px); line-height: 1.15; margin: 0 0 10px;
}
.hero p { color: var(--ink-soft); margin: 0; max-width: 56ch; font-size: 15px; }

/* ---------------------------------------------------------------- filters */
.filters {
  position: sticky; top: 58px; z-index: 20;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  padding: 14px 0 12px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
}
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  flex: none;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--ink-soft); border-radius: 999px;
  padding: 6px 13px; font-size: 13px; font-weight: 550; cursor: pointer;
  transition: all .15s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.chip[disabled] { opacity: .38; cursor: default; }
.chip[disabled]:hover { border-color: var(--line); color: var(--ink-soft); }

.search {
  flex: 1; min-width: 180px;
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line); background: var(--surface);
  border-radius: 999px; padding: 7px 14px; color: var(--muted);
}
.search:focus-within { border-color: var(--accent); }
.search input {
  border: 0; outline: 0; background: transparent; color: var(--ink);
  font: inherit; font-size: 14px; width: 100%;
}
.search svg { width: 16px; height: 16px; flex: none; }

/* ---------------------------------------------------------------- level block */
.levelblock { padding: 10px 0 4px; }
.levelhead { display: flex; align-items: center; gap: 10px; margin: 18px 0 12px; }
.levelhead h2 { font-size: 15px; margin: 0; letter-spacing: .02em; }
.levelhead .rule { flex: 1; height: 1px; background: var(--line); }
.levelhead .desc { color: var(--muted); font-size: 12.5px; }

.badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 34px; padding: 3px 8px; border-radius: 7px;
  font-size: 12px; font-weight: 700; letter-spacing: .03em;
  background: var(--accent-soft); color: var(--accent-ink);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}

/* ---------------------------------------------------------------- resource card */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px; margin-bottom: 18px;
}
.card-head { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; align-items: start; }
.card-head .badge { grid-row: 1 / span 2; margin-top: 3px; }
.card h3 {
  margin: 0; font-family: var(--serif); font-size: 21px; font-weight: 600;
  letter-spacing: -.01em; line-height: 1.25;
}
.card .sub { color: var(--muted); font-size: 13px; margin: 0; }
.card .desc { color: var(--ink-soft); font-size: 14px; margin: 12px 0 0; }
.card .meta {
  display: flex; flex-wrap: wrap; gap: 6px 14px;
  color: var(--muted); font-size: 12.5px; margin-top: 10px;
}
.card .meta b { color: var(--ink-soft); font-weight: 600; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag {
  font-size: 11.5px; color: var(--muted); background: var(--bg-soft);
  border-radius: 6px; padding: 2px 8px;
}

.lessonlist {
  margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line);
  display: grid; grid-template-columns: 1fr; gap: 4px;
}
.lesson {
  display: flex; align-items: baseline; gap: 9px; min-width: 0;
  padding: 9px 10px; border-radius: 9px; border: 1px solid transparent;
  transition: background .12s, border-color .12s;
}
.lesson:hover { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 20%, transparent); }
.lesson .num {
  font-family: var(--mono); font-size: 11.5px; color: var(--muted);
  min-width: 18px; font-variant-numeric: tabular-nums;
}
.lesson .lt {
  font-size: 14px; font-weight: 520; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.lesson .lm { margin-left: auto; font-size: 11px; color: var(--muted); white-space: nowrap; }
.lesson.done .num { color: var(--accent); }

.foot { color: var(--muted); font-size: 12.5px; padding: 30px 0 50px; }
.foot a { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; }

/* ---------------------------------------------------------------- lesson page */
.lessonbar { display: flex; align-items: center; gap: 10px; height: 58px; }
.lessonbar .title { font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lessonbar .title small { color: var(--muted); font-weight: 400; margin-left: 6px; }

.player {
  position: sticky; top: 58px; z-index: 25;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 14px 10px; margin: 12px 0 8px;
}
.player-row { display: flex; align-items: center; gap: 10px; }
.playbtn {
  width: 46px; height: 46px; flex: none; border-radius: 50%;
  border: 0; background: var(--accent); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; transition: transform .1s, filter .15s;
}
.playbtn:hover { filter: brightness(1.08); }
.playbtn:active { transform: scale(.96); }
.playbtn svg { width: 20px; height: 20px; }

.time { font-family: var(--mono); font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

.seek {
  -webkit-appearance: none; appearance: none;
  flex: 1; height: 22px; background: transparent; cursor: pointer; min-width: 60px;
}
.seek::-webkit-slider-runnable-track {
  height: 5px; border-radius: 3px;
  background: linear-gradient(to right, var(--accent) var(--p, 0%), var(--line) var(--p, 0%));
}
.seek::-moz-range-track { height: 5px; border-radius: 3px; background: var(--line); }
.seek::-moz-range-progress { height: 5px; border-radius: 3px; background: var(--accent); }
.seek::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; margin-top: -4.5px;
  border-radius: 50%; background: var(--surface); border: 2px solid var(--accent);
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
}

.player-row2 { display: flex; align-items: center; gap: 6px; margin-top: 6px; }
.pbtn {
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid transparent; background: transparent;
  border-radius: 8px; padding: 6px 8px; font-size: 12.5px; color: var(--ink-soft);
  white-space: nowrap;
  cursor: pointer; transition: background .12s, color .12s, border-color .12s;
}
.pbtn:hover { background: var(--bg-soft); }
.pbtn[aria-pressed="true"] { color: var(--accent-ink); background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 25%, transparent); }
.pbtn svg { width: 16px; height: 16px; }
.speed { margin-left: auto; display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 12px; }
select.speed-sel {
  font: inherit; font-size: 12.5px; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 8px; padding: 5px 6px;
}

/* ---------------------------------------------------------------- transcript */
.transcript { padding: 10px 0 80px; }

.seg {
  display: grid; grid-template-columns: 58px 1fr; gap: 0 12px;
  padding: 9px 12px; margin: 0 -12px; border-radius: 10px;
  cursor: pointer; border-left: 3px solid transparent;
  transition: background .12s;
}
.seg:hover { background: var(--bg-soft); }
.seg .ts {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  padding-top: 4px; font-variant-numeric: tabular-nums;
  user-select: none;
}
.seg .spk {
  font-size: 11px; font-weight: 650; letter-spacing: .03em;
  color: var(--spk, var(--accent)); margin-bottom: 1px;
}
.seg .src {
  font-family: var(--serif); font-size: 17.5px; line-height: 1.5;
  color: var(--ink); letter-spacing: .002em;
}
.seg.active {
  background: var(--accent-soft);
  border-left-color: var(--accent);
}
.seg.active .src { color: var(--accent-ink); font-weight: 600; }
.seg.active .ts { color: var(--accent); }

.empty { color: var(--muted); text-align: center; padding: 40px 0; }

/* ---------------------------------------------------------------- print page */
.sheet { padding-top: 20px; padding-bottom: 60px; }
.sheet-tools { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--line); background: var(--surface);
  border-radius: 10px; padding: 9px 14px; font-size: 13.5px; cursor: pointer;
  color: var(--ink-soft);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn svg { width: 16px; height: 16px; }

.doc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 32px; box-shadow: var(--shadow); margin-bottom: 22px; }
.doc h2 { font-family: var(--serif); font-size: 24px; margin: 0 0 4px; letter-spacing: -.01em; }
.doc .doc-meta { color: var(--muted); font-size: 12.5px; margin-bottom: 22px; }
.doc .line {
  display: grid; grid-template-columns: 6.6em 1fr;
  column-gap: 10px; padding: 5px 0; align-items: start;
}
.doc .line .spk {
  font-size: 12.5px; font-weight: 650; color: var(--accent-ink);
  letter-spacing: .01em; padding-top: 2px; white-space: nowrap;
}
.doc .line:not(.has-spk) { grid-template-columns: 0 1fr; column-gap: 0; }
.doc .line:not(.has-spk) .spk { display: none; }
.doc .line .body { min-width: 0; }
.doc .line .src {
  font-family: var(--serif); font-size: 15px; line-height: 1.5; display: block;
}

/* ---------------------------------------------------------------- toast */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px);
  background: var(--ink); color: var(--bg); font-size: 13px;
  padding: 9px 16px; border-radius: 999px; opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s; z-index: 60;
}
.toast.show { opacity: .95; transform: translate(-50%, 0); }

/* ---------------------------------------------------------------- print */
@media print {
  :root { --ink: #000; --muted: #555; --line: #ccc; }
  body { background: #fff; font-size: 10.5pt; }
  .no-print, .topbar, .sheet-tools, .toast { display: none !important; }
  .wrap { max-width: none; padding: 0; }
  .doc {
    border: 0; box-shadow: none; border-radius: 0; padding: 0;
    margin: 0; break-after: page; page-break-after: always;
  }
  .doc:last-child { break-after: auto; page-break-after: auto; }
  .doc h2 { font-size: 16pt; }
  .doc .doc-meta { font-size: 8.5pt; margin-bottom: 12pt; }
  .doc .line { padding: 3pt 0; grid-template-columns: 52pt 1fr; column-gap: 8pt; }
  .doc .line .src { font-size: 11pt; line-height: 1.45; }
  .doc .line .spk { font-size: 9.5pt; }
  @page { size: A4; margin: 18mm 16mm 16mm; }
}

@media (min-width: 640px) {
  .lessonlist { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 18px; }
}

@media (max-width: 520px) {
  .player { position: static; }
  .brand small { display: none; }
  .lang-sel { font-size: 12px; padding: 6px 6px; max-width: 7.5em; }
  .pbtn { padding: 6px 6px; font-size: 12px; gap: 4px; }
  .pbtn svg { width: 15px; height: 15px; }
  #counter { display: none; }
  .search { min-width: 100%; }
  .card { padding: 16px; }
  .seg { grid-template-columns: 44px 1fr; gap: 0 8px; padding: 8px 10px; margin: 0 -10px; }
  .seg .src { font-size: 16.5px; }
  .seg .ts { font-size: 10px; }
  .lessonlist { grid-template-columns: 1fr; }
  .doc { padding: 20px 18px; }
  .hero { padding: 22px 0 8px; }
}

@media (max-width: 640px) {
  #chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  #chips::-webkit-scrollbar { display: none; }
}