:root {
  color-scheme: dark;
  --bg: #07161b;
  --surface: #0d2228;
  --surface-2: #102d34;
  --line: #25474d;
  --text: #edf4ee;
  --muted: #9fb7b8;
  --mint: #8ddbc7;
  --mint-deep: #27685f;
  --gold: #f3bd60;
  --coral: #ea877b;
  --shadow: rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans SC", "PingFang SC", sans-serif;
}

button,
input,
select { font: inherit; }

button,
a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.companion-app { min-height: 100vh; }

.companion-topbar {
  min-height: 76px;
  display: grid;
  grid-template-columns: minmax(200px, 1fr) auto minmax(200px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 12px 22px;
  border-bottom: 1px solid var(--line);
  background: #08191f;
}

.companion-brand {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.companion-brand strong,
.companion-brand small { display: block; }
.companion-brand strong { font-size: 15px; letter-spacing: 0; }
.companion-brand small { margin-top: 2px; color: var(--muted); font-size: 11px; }

.companion-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid #8a7041;
  border-radius: 7px;
  background: #43382a;
  color: #ffe0a0;
  font-family: Georgia, serif;
  font-size: 20px;
}

.companion-title { text-align: center; }
.companion-title span,
.route-heading span,
.notes-heading span,
.dialogue-heading span,
.dialogue-context > span,
.transcript-note > span,
.checkpoint-summary > span,
.video-status-layer span {
  color: var(--mint);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.6px;
}

.companion-title h1 {
  margin: 3px 0 0;
  font-family: Georgia, "Songti SC", serif;
  font-size: 23px;
  font-weight: 600;
  letter-spacing: 0;
}

.companion-actions {
  justify-self: end;
  display: flex;
  gap: 8px;
}

.companion-actions a,
.companion-video-controls button,
.response-actions button,
.text-answer-form button {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
}

.companion-actions a {
  display: grid;
  place-items: center;
  padding: 0 12px;
  color: var(--mint);
  font-size: 12px;
  font-weight: 700;
}

.companion-workspace {
  width: 100%;
  min-height: calc(100vh - 76px);
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr) 250px;
  gap: 10px;
  padding: 10px;
}

.companion-route,
.companion-notes,
.companion-dialogue,
.companion-video-area {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
}

.companion-route,
.companion-notes { min-height: 0; }

.route-heading,
.notes-heading,
.dialogue-heading,
.video-stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px;
  border-bottom: 1px solid var(--line);
}

.route-heading strong,
.notes-heading strong { color: var(--gold); font-size: 14px; }

.segment-route {
  max-height: calc(100vh - 135px);
  margin: 0;
  padding: 8px;
  overflow: auto;
  list-style: none;
}

.segment-route button {
  width: 100%;
  min-height: 58px;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}

.segment-route button:hover { background: #102a30; }
.segment-route button.is-current { border-color: var(--mint-deep); color: var(--text); background: #12362f; }
.segment-route button.is-complete { color: var(--mint); }
.segment-route button span:first-child {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 11px;
}
.segment-route button strong { overflow: hidden; font-size: 12px; line-height: 1.25; text-overflow: ellipsis; white-space: nowrap; }
.segment-route button small { color: inherit; font-size: 13px; }

.companion-stage { min-width: 0; display: grid; grid-template-rows: minmax(370px, 1.5fr) minmax(290px, 0.85fr); gap: 10px; }

.companion-video-area { min-height: 0; overflow: hidden; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; }

.video-stage-head { min-height: 52px; padding: 11px 14px; }
.video-stage-head > span:first-child { color: var(--mint); font-size: 10px; font-weight: 800; letter-spacing: 1.4px; }
.video-stage-head strong { overflow: hidden; font-size: 14px; text-overflow: ellipsis; white-space: nowrap; }
.watch-state { color: var(--gold); font-size: 11px; white-space: nowrap; }

.companion-video-frame { position: relative; min-height: 0; overflow: hidden; background: #000; }
.companion-video-frame video { width: 100%; height: 100%; display: block; object-fit: contain; background: #000; }

.video-status-layer {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 12px;
  padding: 30px;
  background: rgba(4, 13, 16, 0.62);
  text-align: center;
  transition: opacity 160ms ease, visibility 160ms ease;
}

.video-status-layer.is-hidden { visibility: hidden; opacity: 0; pointer-events: none; }
.video-status-layer strong { max-width: 520px; font-family: Georgia, "Songti SC", serif; font-size: 26px; font-weight: 500; }

.video-start-button {
  min-width: 106px;
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  background: var(--gold);
  color: #162326;
  cursor: pointer;
  font-weight: 800;
}

.caption-bar {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  min-height: 52px;
  padding: 12px 18px;
  background: rgba(0, 0, 0, 0.74);
  color: #fff;
  font-family: Georgia, "Songti SC", serif;
  font-size: 19px;
  line-height: 1.25;
  text-align: center;
}

.companion-video-controls { min-height: 52px; display: grid; grid-template-columns: auto minmax(160px, 1fr) auto; align-items: center; gap: 14px; padding: 9px 14px; border-top: 1px solid var(--line); }
.companion-video-controls button { padding: 0 11px; font-size: 12px; }
.companion-video-controls button:hover { border-color: var(--mint-deep); color: var(--mint); }
.segment-timing { display: grid; grid-template-columns: 44px 1fr 44px; align-items: center; gap: 8px; color: var(--muted); font-size: 11px; }
.segment-timing input { accent-color: var(--mint); }
.speed-control { display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 11px; }
.speed-control select { height: 32px; border: 1px solid var(--line); border-radius: 5px; background: #102a30; color: var(--text); }

.companion-dialogue { min-height: 0; display: grid; grid-template-rows: auto auto minmax(54px, 1fr) auto; overflow: hidden; }
.dialogue-heading { padding: 12px 15px; }
.dialogue-heading h2 { margin: 2px 0 0; font-family: Georgia, "Songti SC", serif; font-size: 21px; font-weight: 500; }
.voice-state { padding: 5px 8px; border: 1px solid var(--mint-deep); border-radius: 999px; color: var(--mint) !important; font-size: 10px !important; letter-spacing: 0 !important; }
.voice-state.is-busy { border-color: #906441; color: var(--gold) !important; }
.voice-state.is-error { border-color: #824c4a; color: var(--coral) !important; }

.dialogue-context { padding: 13px 15px; border-bottom: 1px solid var(--line); background: #0b2025; }
.dialogue-context strong { display: block; margin-top: 5px; font-size: 16px; line-height: 1.35; }
.dialogue-context p { min-height: 16px; margin: 5px 0 0; color: var(--muted); font-size: 12px; }

.dialogue-turns { display: flex; flex-direction: column; gap: 8px; min-height: 54px; max-height: 180px; padding: 12px 15px; overflow: auto; }
.dialogue-turn { max-width: min(86%, 620px); padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: #102b32; }
.dialogue-turn.is-learner { align-self: flex-end; border-color: #4d716d; background: #173f3a; }
.dialogue-turn.is-system { border-style: dashed; color: var(--muted); background: transparent; }
.dialogue-turn span { display: block; margin-bottom: 3px; color: var(--mint); font-size: 10px; font-weight: 800; letter-spacing: 1px; }
.dialogue-turn p { margin: 0; font-size: 13px; line-height: 1.4; }

.companion-response { padding: 10px 15px 12px; border-top: 1px solid var(--line); background: #0a1c21; }
.response-actions { display: flex; flex-wrap: wrap; gap: 7px; }
.response-actions button { padding: 0 11px; font-size: 12px; }
.response-actions button:disabled,
.text-answer-form button:disabled { cursor: default; opacity: 0.4; }
.listen-button { border-color: var(--mint-deep) !important; color: var(--mint) !important; }
.listen-button.is-listening { border-color: var(--coral) !important; color: #ffd0ca !important; }
.listen-button:not(:disabled) { background: #123a37 !important; border-color: #5ba89c !important; }
.response-actions .listen-button.is-listening:disabled { opacity: 1; background: #382627 !important; }
.continue-button { border-color: #8a7041 !important; color: var(--gold) !important; }

.text-answer-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 7px; margin-top: 9px; }
.text-answer-form input { min-width: 0; height: 34px; padding: 0 10px; border: 1px solid var(--line); border-radius: 5px; background: #102a30; color: var(--text); font-size: 12px; }
.text-answer-form input::placeholder { color: #759193; }
.text-answer-form button { padding: 0 12px; font-size: 12px; }
.live-transcript { min-height: 16px; margin: 7px 0 0; color: var(--mint); font-size: 11px; line-height: 1.35; }
.response-status { min-height: 16px; margin: 7px 0 0; color: var(--muted); font-size: 11px; }
.response-status.is-good { color: var(--mint); }
.response-status.is-bad { color: var(--coral); }

.companion-notes { padding-bottom: 14px; }
.companion-notes > p { margin: 14px; color: var(--text); font-size: 13px; line-height: 1.5; }
.transcript-note { margin: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.transcript-note p { margin: 8px 0 0; color: var(--muted); font-family: Georgia, "Songti SC", serif; font-size: 15px; line-height: 1.5; }
.checkpoint-summary { display: flex; align-items: center; justify-content: space-between; margin: 18px 14px 0; padding: 11px 0; border-top: 1px solid var(--line); }
.checkpoint-summary strong { color: var(--gold); font-size: 18px; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 1160px) {
  .companion-workspace { grid-template-columns: 210px minmax(0, 1fr); }
  .companion-notes { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.3fr 1.6fr auto; gap: 0; align-items: start; }
  .companion-notes .notes-heading { grid-row: 1 / span 2; }
  .companion-notes > p,
  .companion-notes .transcript-note,
  .companion-notes .checkpoint-summary { margin: 14px; }
}

@media (max-width: 760px) {
  .companion-topbar { grid-template-columns: 1fr auto; min-height: 64px; padding: 10px 12px; }
  .companion-title { display: none; }
  .companion-actions { gap: 5px; }
  .companion-actions a { min-height: 31px; padding: 0 8px; font-size: 11px; }
  .companion-workspace { display: flex; flex-direction: column; gap: 8px; padding: 8px; }
  .companion-route { order: 2; }
  .companion-stage { order: 1; display: flex; flex-direction: column; }
  .companion-notes { order: 3; display: block; }
  .segment-route { max-height: 162px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
  .segment-route button { min-height: 48px; grid-template-columns: 23px minmax(0, 1fr); }
  .segment-route button small { display: none; }
  .companion-stage { grid-template-rows: none; }
  .companion-video-area { min-height: auto; }
  .companion-video-frame { aspect-ratio: 16 / 9; }
  .companion-video-controls { grid-template-columns: auto 1fr; }
  .speed-control { grid-column: 2; justify-self: end; }
  .segment-timing { grid-column: 1 / -1; grid-row: 2; }
  .caption-bar { min-height: 44px; padding: 8px 12px; font-size: 15px; }
  .video-status-layer strong { font-size: 21px; }
  .dialogue-turns { max-height: 150px; }
}