:root {
  --bg: #0f1226;
  --bg2: #1a1f3c;
  --card: #232a4d;
  --line: #333c66;
  --fg: #eef1ff;
  --dim: #9aa3c7;
  --accent: #ffc93c;
  --good: #3ddc97;
  --bad: #ff6b6b;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 0%, #232a56 0%, var(--bg) 55%);
  color: var(--fg);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  display: flex;
  justify-content: center;
  padding: 28px 16px 60px;
}

#app { width: 100%; max-width: 760px; }

.screen { display: none; }
.screen.active { display: block; animation: fade .25s ease; }

@keyframes fade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* 首页 */
.hero { text-align: center; margin-bottom: 26px; }
.hero h1 {
  font-size: 40px;
  margin: 0 0 8px;
  letter-spacing: 6px;
  background: linear-gradient(100deg, #ffc93c, #ff9a3c 60%, #ff6b6b);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub { color: var(--dim); margin: 0; font-size: 14px; }

.dash {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.stat {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 8px;
  text-align: center;
}
.stat .num { display: block; font-size: 26px; font-weight: 700; color: var(--accent); }
.stat .label { font-size: 12px; color: var(--dim); }

h2 { font-size: 15px; color: var(--dim); font-weight: 600; margin: 0 0 12px; letter-spacing: 1px; }

.grade-card, .badges {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.grade-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 13px; }
.grade-row:last-child { margin-bottom: 0; }
.grade-name { width: 56px; color: var(--dim); flex: none; }
.bar { flex: 1; height: 10px; background: #141833; border-radius: 6px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, #3ddc97, #66e0ff); border-radius: 6px; transition: width .4s; }
.grade-num { width: 62px; text-align: right; color: var(--dim); font-variant-numeric: tabular-nums; }

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 22px 0; }

.btn {
  border: none;
  border-radius: 12px;
  padding: 12px 22px;
  font-size: 15px;
  cursor: pointer;
  font-family: inherit;
  transition: transform .12s, filter .2s;
}
.btn:active { transform: scale(.97); }
.btn.primary { background: linear-gradient(100deg, #ffc93c, #ff9a3c); color: #221a04; font-weight: 700; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--dim); border: 1px solid var(--line); }
.btn.ghost:hover { color: var(--fg); border-color: var(--dim); }
.btn.big { font-size: 17px; padding: 16px 34px; flex: 1; min-width: 220px; }
.btn.small { padding: 7px 14px; font-size: 13px; }

.badge-list { display: flex; flex-wrap: wrap; gap: 8px; }
.badge {
  font-size: 12px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px dashed var(--line);
  color: #555f88;
}
.badge.on {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: rgba(255, 201, 60, .1);
}

/* 答题 */
.play-top { display: flex; align-items: center; gap: 14px; margin-bottom: 26px; }
.progress { flex: 1; height: 8px; background: var(--bg2); border-radius: 999px; overflow: hidden; }
#progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, #ffc93c, #ff6b6b); transition: width .3s; }
.score { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }

.quiz {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 34px 26px 26px;
  text-align: center;
}
.quiz-hint { font-size: 13px; color: var(--dim); letter-spacing: 1px; }
.quiz-word { font-size: 62px; font-weight: 700; margin: 16px 0 4px; letter-spacing: 4px; }
.quiz-pinyin { color: var(--accent); font-size: 16px; margin-bottom: 26px; letter-spacing: 2px; }

.options { display: grid; gap: 10px; }
.opt {
  padding: 15px 18px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: border-color .15s, background .15s, transform .1s;
}
.opt:hover { border-color: var(--accent); }
.opt:active { transform: scale(.99); }
.opt.right { border-color: var(--good); background: rgba(61, 220, 151, .14); }
.opt.wrong { border-color: var(--bad); background: rgba(255, 107, 107, .14); }
.opt:disabled { cursor: default; }

.feedback { min-height: 30px; margin-top: 16px; font-size: 14px; color: var(--dim); }
.feedback.ok { color: var(--good); }
.feedback.no { color: var(--bad); }

.combo {
  text-align: center;
  margin-top: 18px;
  height: 24px;
  color: var(--accent);
  font-weight: 700;
  opacity: 0;
  transition: opacity .2s;
}
.combo.on { opacity: 1; }

/* 结算 */
.result-card {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 34px 26px;
  text-align: center;
}
.result-card h2 { font-size: 24px; color: var(--fg); margin-bottom: 22px; letter-spacing: 2px; }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 22px; }
.result-grid div { background: var(--card); border-radius: 14px; padding: 16px 8px; }
.result-grid span { display: block; font-size: 28px; font-weight: 700; color: var(--accent); }
.result-grid em { font-style: normal; font-size: 12px; color: var(--dim); }
.result-card .actions { justify-content: center; margin-bottom: 0; }
.new-badges { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.new-badge { color: var(--accent); font-size: 14px; }

@media (max-width: 560px) {
  .dash { grid-template-columns: repeat(2, 1fr); }
  .quiz-word { font-size: 46px; }
  .hero h1 { font-size: 32px; }
  .btn.big { min-width: 100%; }
}