:root {
  --bg: #0f1220;
  --bg-2: #161a2e;
  --card: #1b2039;
  --card-2: #222847;
  --line: #2c3355;
  --text: #eef1fb;
  --muted: #9aa3c7;
  --accent: #7c9cff;
  --accent-2: #59d3b4;
  --warn: #ffcf6b;
  --bad: #ff8a8a;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background:
    radial-gradient(1200px 600px at 50% -10%, #23305e 0%, rgba(35,48,94,0) 60%),
    var(--bg);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100dvh;
}

#app {
  max-width: 560px;
  margin: 0 auto;
  padding: max(14px, env(safe-area-inset-top)) 16px calc(24px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 100dvh;
}

/* Top bar */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; color: inherit; text-decoration: none; }
.brand-mark { font-size: 26px; }
.brand-title { font-weight: 700; letter-spacing: .2px; }
.brand-sub { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 46vw; }
.status { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); background: var(--bg-2); border: 1px solid var(--line); padding: 5px 10px; border-radius: 999px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.dot.ok { background: var(--accent-2); box-shadow: 0 0 0 3px rgba(89,211,180,.15); }
.dot.warn { background: var(--warn); }
.dot.bad { background: var(--bad); }

/* Course picker */
.course-switch {
  display: flex; align-items: center; gap: 10px; padding: 8px 11px;
  background: rgba(22,26,46,.72); border: 1px solid var(--line); border-radius: 12px;
}
.course-switch label { color: var(--muted); font-size: 12px; font-weight: 650; }
.course-switch select {
  flex: 1; min-width: 0; color: var(--text); background: var(--card);
  border: 1px solid var(--line); border-radius: 9px; padding: 7px 30px 7px 10px;
  font: inherit; font-size: 13px;
}
.course-switch select:focus { outline: none; border-color: var(--accent); }
.podcast-link {
  color: #27171a; background: linear-gradient(180deg, #ffad79, #ff846f);
  border-radius: 9px; padding: 7px 10px; text-decoration: none;
  font-size: 12px; font-weight: 750; white-space: nowrap;
}

/* Progress */
.progress-row { display: flex; align-items: center; justify-content: space-between; }
.seg-count { font-size: 13px; color: var(--muted); }
.pips { display: flex; gap: 6px; }
.pips .pip { width: 26px; height: 5px; border-radius: 3px; background: var(--line); transition: background .25s; }
.pips .pip.done { background: var(--accent-2); }
.pips .pip.active { background: var(--accent); }

/* Card */
.card {
  background: linear-gradient(180deg, var(--card) 0%, var(--card-2) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.hidden { display: none !important; }

/* Player */
.seg-order { font-size: 12px; letter-spacing: 3px; color: var(--accent); font-weight: 700; }
.seg-title { font-size: 20px; line-height: 1.3; margin: 6px 0 18px; }

.scrubber { margin-bottom: 16px; }
.bar { height: 8px; border-radius: 999px; background: var(--bg-2); overflow: hidden; cursor: pointer; }
.fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); border-radius: 999px; transition: width .1s linear; }
.times { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: 6px; }

.controls { display: flex; align-items: center; justify-content: center; gap: 16px; }
.btn {
  font: inherit; color: var(--text); border: 1px solid var(--line);
  background: var(--bg-2); border-radius: 12px; padding: 10px 16px;
  cursor: pointer; transition: transform .08s ease, background .15s, border-color .15s, opacity .15s;
}
.btn:active { transform: scale(.96); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.play {
  width: 68px; height: 68px; border-radius: 50%; font-size: 24px;
  display: grid; place-items: center; border: none;
  background: linear-gradient(180deg, var(--accent), #5b7cf0);
  color: #0b0e1c; box-shadow: 0 8px 20px rgba(124,156,255,.4);
}
.btn.ghost { background: transparent; }
.btn.primary { background: linear-gradient(180deg, var(--accent-2), #3fb99a); color: #06231c; border: none; font-weight: 650; }
.btn.link { background: none; border: none; color: var(--muted); padding: 8px 4px; }
.btn.sm { padding: 6px 10px; font-size: 13px; }
.btn.wide { width: 100%; padding: 14px; font-size: 16px; }
.btn.mic { padding: 0; width: 46px; height: 46px; border-radius: 12px; font-size: 18px; flex: 0 0 auto; }
.btn.mic.listening { background: rgba(255,138,138,.18); border-color: var(--bad); }

/* Segment transport (car-style prev/next + press-and-hold scan) */
.transport { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 16px; }
.btn.nav {
  flex: 0 0 auto; min-width: 96px; font-weight: 600; letter-spacing: .2px;
  display: inline-flex; align-items: center; gap: 6px; justify-content: center;
  user-select: none; -webkit-user-select: none; touch-action: manipulation;
}
.btn.nav .nav-ic { font-size: 20px; line-height: 1; }
.btn.nav.holding { background: rgba(124,156,255,.20); border-color: var(--accent); color: var(--accent); }
.transport-hint { font-size: 11px; color: var(--muted); opacity: .8; text-align: center; flex: 1 1 auto; }

/* Transcript */
.transcript { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 10px; }
.transcript summary { cursor: pointer; color: var(--muted); font-size: 13px; list-style: none; }
.transcript summary::-webkit-details-marker { display: none; }
.transcript summary::before { content: "▸ "; }
.transcript[open] summary::before { content: "▾ "; }
.transcript p { color: var(--muted); font-size: 14px; margin: 10px 0 0; }

/* Karaoke transcript — dark-theme tokens for the shared SyncedTranscript core.
   The ID+class selector outranks both the core's `.st-transcript` defaults and
   the plain `.transcript p` rule, so upcoming/past/spoken words all read on the
   dark card. Per-word colors still come from .st-word / .st-past / .st-spoken. */
#transcriptText.st-transcript {
  color: var(--st-dim);
  --st-ink: var(--text);
  --st-past: var(--muted);
  --st-dim: #6b74a1;
  --st-highlight: rgba(124,156,255,.20);
  font-size: 15px; line-height: 1.75; margin-top: 10px;
}
#transcriptText .st-word { padding: 0 1px; }
#transcriptText .st-spoken { color: var(--st-ink); background: var(--st-highlight); }

/* Checkpoint */
.chk-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.chk-badge { font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: #06231c; background: var(--accent-2); padding: 3px 8px; border-radius: 6px; }
.chk-hint { font-size: 13px; color: var(--muted); }
.ask-row { display: flex; gap: 8px; align-items: flex-end; }
textarea#askInput {
  flex: 1; resize: none; font: inherit; color: var(--text);
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px; max-height: 140px; overflow-y: auto;
}
textarea#askInput:focus { outline: none; border-color: var(--accent); }
.chk-actions { display: flex; gap: 10px; margin-top: 12px; }
.chk-actions .btn { flex: 1; }

/* Reply */
.reply { margin-top: 16px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.reply-meta { font-size: 11px; color: var(--muted); margin-bottom: 8px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.tag { font-size: 10px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; padding: 2px 7px; border-radius: 6px; border: 1px solid var(--line); }
.tag.grounded { color: var(--accent-2); border-color: rgba(89,211,180,.4); }
.tag.abstain { color: var(--warn); border-color: rgba(255,207,107,.4); }
.tag.quiz { color: var(--accent); border-color: rgba(124,156,255,.4); }
.tag.fallback { color: var(--bad); border-color: rgba(255,138,138,.4); }
.reply-text { margin: 4px 0 10px; font-size: 15.5px; }
.reply-controls { display: flex; align-items: center; gap: 12px; }
.reply-spinner { font-size: 12px; color: var(--muted); }

.chk-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 18px; gap: 10px; }
#btnNext { min-width: 130px; }

/* Wrap-up */
.wrapup { text-align: center; }
.wrap-emoji { font-size: 44px; }
.wrapup h2 { margin: 8px 0 6px; }
.wrap-lead { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.wrap-list { text-align: left; color: var(--text); font-size: 14px; padding-left: 20px; margin: 0 0 20px; }
.wrap-list li { margin: 8px 0; }

/* Footer */
.foot { margin-top: auto; text-align: center; font-size: 11px; color: var(--muted); opacity: .8; padding-top: 6px; word-break: break-word; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translateX(-50%); background: #2a2140; color: var(--warn);
  border: 1px solid rgba(255,207,107,.4); padding: 10px 16px; border-radius: 10px;
  font-size: 13px; box-shadow: var(--shadow); z-index: 50; max-width: 90vw; text-align: center;
}

@media (min-width: 600px) {
  .seg-title { font-size: 22px; }
}