:root {
  --bg: #f7f4ec;
  --ink: #1f2a44;
  --blue: #2b3f8c;
  --blue-soft: #e8ecf8;
  --gold: #f5c518;
  --card: #ffffff;
  --muted: #6b7280;
  --line: #e5e0d3;
  --ok: #1a7f4b;
  --err: #b3261e;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}
#app { max-width: 760px; margin: 0 auto; padding: 16px 16px 60px; }
h1 { font-size: 26px; }
h2 { font-size: 20px; margin-bottom: 6px; }
h3 { font-size: 16px; margin-bottom: 6px; }
p.sub { color: var(--muted); font-size: 14px; margin-bottom: 14px; }

.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 0 16px;
}
.back-btn {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 10px; padding: 8px 14px; font-size: 14px; cursor: pointer;
}
.back-btn:hover { background: var(--blue-soft); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px; margin-bottom: 14px; box-shadow: 0 1px 3px rgba(31,42,68,.06);
}

.chapter-card { cursor: pointer; transition: transform .08s ease; }
.chapter-card:hover { transform: translateY(-2px); }
.chapter-card .cn { font-size: 20px; font-weight: 700; }
.chapter-card .en { color: var(--muted); font-size: 14px; margin-top: 2px; }

.badge-new {
  display: inline-block; background: var(--gold); color: #4a3a00;
  font-size: 11px; font-weight: 700; border-radius: 999px;
  padding: 2px 8px; margin-left: 8px; vertical-align: middle;
}
.extra-item {
  background: #fffbe6; border-color: var(--gold);
}

.word-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px;
  margin-bottom: 8px; background: var(--card);
}
.word-row .hanzi { font-size: 19px; font-weight: 700; min-width: 74px; }
.word-row .pinyin { color: var(--blue); font-size: 14px; min-width: 110px; }
.word-row .en { color: var(--muted); font-size: 14px; flex: 1; }

.spk {
  border: none; background: var(--blue-soft); color: var(--blue);
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 15px;
  flex-shrink: 0;
}
.spk.playing { background: var(--blue); color: #fff; }

.tabs { display: flex; gap: 8px; margin: 4px 0 14px; flex-wrap: wrap; }
.tab {
  border: 1px solid var(--line); background: var(--card); border-radius: 999px;
  padding: 7px 16px; font-size: 14px; cursor: pointer;
}
.tab.active { background: var(--blue); color: #fff; border-color: var(--blue); }

.btn {
  border: 1px solid var(--blue); background: var(--blue); color: #fff;
  border-radius: 10px; padding: 10px 18px; font-size: 15px; cursor: pointer;
}
.btn.ghost { background: var(--card); color: var(--blue); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }

.progress {
  height: 8px; background: var(--blue-soft); border-radius: 999px; overflow: hidden;
  margin: 10px 0 14px;
}
.progress > div { height: 100%; background: var(--blue); border-radius: 999px; }

.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.match-tile {
  border: 1px solid var(--line); background: var(--card); border-radius: 12px;
  padding: 14px 8px; text-align: center; font-size: 16px; cursor: pointer; min-height: 52px;
}
.match-tile.sel { border-color: var(--blue); background: var(--blue-soft); }
.match-tile.ok { border-color: var(--ok); background: #e8f5ee; color: var(--ok); }
.match-tile.err { border-color: var(--err); background: #fbeaea; }

.opt {
  display: block; width: 100%; text-align: left; margin-bottom: 8px;
  border: 1px solid var(--line); background: var(--card); border-radius: 12px;
  padding: 12px 14px; font-size: 16px; cursor: pointer;
}
.opt.ok { border-color: var(--ok); background: #e8f5ee; }
.opt.err { border-color: var(--err); background: #fbeaea; }

.flashcard {
  height: 260px; border-radius: 18px; border: 1px solid var(--line);
  background: var(--card); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px; cursor: pointer;
  box-shadow: 0 2px 8px rgba(31,42,68,.08); padding: 20px; text-align: center;
}
.flashcard .big { font-size: 34px; font-weight: 800; }
.flashcard .py { color: var(--blue); font-size: 18px; }
.flashcard .en { color: var(--muted); font-size: 16px; }
.flashcard .hint { color: var(--muted); font-size: 12px; margin-top: 10px; }

.coach-msg { margin-bottom: 10px; max-width: 85%; }
.coach-msg .bubble { border-radius: 14px; padding: 10px 14px; font-size: 15px; white-space: pre-wrap; line-height: 1.55; }
.coach-msg.user { margin-left: auto; }
.coach-msg.user .bubble { background: var(--blue); color: #fff; border-bottom-right-radius: 4px; }
.coach-msg.ai .bubble { background: var(--card); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.coach-msg .tools { margin-top: 4px; }
.coach-input { display: flex; gap: 8px; margin-top: 12px; }
.coach-input textarea {
  flex: 1; border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px;
  font-size: 15px; resize: vertical; min-height: 44px; font-family: inherit;
}
.mic-btn.rec { background: var(--err); color: #fff; }

input.field, select.field {
  width: 100%; border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; font-size: 15px; margin-bottom: 10px;
}
.notice { font-size: 13px; color: var(--muted); line-height: 1.6; }
.legend { font-size: 12px; color: var(--muted); margin: 8px 0 14px; }
.legend .dot { display: inline-block; width: 12px; height: 12px; background: var(--gold); border-radius: 3px; vertical-align: -1px; margin-right: 4px; }

/* ---------- Scene dialog animation ---------- */
.scene-stage { display: flex; justify-content: space-around; align-items: flex-end; gap: 8px; padding: 12px 4px 4px; background: linear-gradient(180deg, #fdfbf5 0%, #f2ecdd 100%); border: 2px solid var(--line); border-radius: 14px; margin-bottom: 10px; }
.scene-col { display: flex; flex-direction: column; align-items: center; width: 45%; }
.scene-bubble { position: relative; background: #fff; border: 2px solid #6b6b6b; border-radius: 14px; padding: 7px 9px; font-size: 15px; min-height: 38px; min-width: 80px; display: flex; align-items: center; justify-content: center; text-align: center; opacity: 0; transform: scale(.6) translateY(6px); transition: all .25s ease; margin-bottom: 14px; line-height: 1.3; }
.scene-bubble.show { opacity: 1; transform: scale(1) translateY(0); }
.scene-bubble::after { content: ""; position: absolute; bottom: -9px; left: 50%; margin-left: -7px; width: 12px; height: 12px; background: #fff; border-right: 2px solid #6b6b6b; border-bottom: 2px solid #6b6b6b; transform: rotate(45deg); border-radius: 0 0 4px 0; }
.scene-fig { width: 62px; }
.scene-fig svg { width: 100%; display: block; }
.scene-fig.talk { animation: sceneTalk .55s ease-in-out infinite; }
@keyframes sceneTalk { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
.scene-name { font-size: 12px; color: var(--muted); margin-top: 3px; }
.word-row.active { background: #fdf6e3; box-shadow: 0 0 0 2px #e8d9a8 inset; border-radius: 10px; }