:root {
  --bg: #0f1420;
  --bg-elev: #171e2e;
  --bg-elev-2: #1f2838;
  --border: #2a3346;
  --text: #e6ebf5;
  --text-dim: #8a94ab;
  --accent: #4fd1c5;
  --accent-2: #63b3ed;
  --good: #48bb78;
  --bad: #f56565;
  --warn: #ecc94b;
  --finger-index: #63b3ed;
  --finger-middle: #4fd1c5;
  --finger-ring: #f6ad55;
  --finger-thumb: #b794f4;
  --finger-other: #4a5568;
  --radius: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

.banner {
  padding: 10px 20px;
  text-align: center;
  font-size: 14px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.banner--warn { background: #3a2e12; color: var(--warn); border-bottom: 1px solid #5a4a1a; }
.banner--info { background: #16283a; color: var(--accent-2); border-bottom: 1px solid #234; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
}
.brand { font-size: 18px; font-weight: 700; cursor: pointer; }

.stats-bar { display: flex; gap: 24px; }
.stat { font-size: 13px; color: var(--text-dim); display: flex; gap: 6px; align-items: baseline; }
.stat label { }
.stat b { font-family: "SF Mono", Consolas, monospace; font-size: 16px; color: var(--text); }
.stat b.good { color: var(--good); }
.stat b.bad { color: var(--bad); }
.stat-target { font-size: 11px; color: var(--text-dim); }

#app { max-width: 960px; margin: 0 auto; padding: 24px; }

.hero { text-align: center; margin-bottom: 28px; }
.hero h1 { font-size: 26px; margin-bottom: 8px; }
.hero p { color: var(--text-dim); margin: 0; }

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}
.category-card {
  border-radius: 20px;
  padding: 32px 24px;
  cursor: pointer;
  text-align: center;
  transition: transform .15s;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
.category-card:hover { transform: translateY(-3px); }
.category-card.cat-practice { background: linear-gradient(135deg, var(--accent-2), var(--accent)); }
.category-card.cat-real { background: linear-gradient(135deg, var(--finger-thumb), var(--finger-ring)); }
.cat-emoji { font-size: 40px; margin-bottom: 10px; }
.cat-title { font-size: 22px; font-weight: 800; color: #0f1420; margin-bottom: 6px; }
.cat-subtitle { font-size: 13px; color: rgba(15,20,32,.75); font-weight: 600; }

.settings-row input[type="number"] {
  width: 90px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 14px;
}
.settings-row input[type="number"]:focus { outline: none; border-color: var(--accent); }
.settings-row input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--accent); cursor: pointer; }

.segmented { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-start; }
.segmented button {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: "SF Mono", Consolas, monospace;
}
.segmented button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0f1420;
  font-weight: 700;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 32px;
}

.level-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: transform .15s, border-color .15s;
}
.level-card:hover:not(.locked) { transform: translateY(-2px); border-color: var(--accent); }
.level-card.locked { opacity: .45; cursor: not-allowed; }
.level-card h3 { margin: 0 0 4px; font-size: 15px; }
.level-card .subtitle { color: var(--accent-2); font-size: 13px; margin-bottom: 8px; }
.level-card .desc { color: var(--text-dim); font-size: 12px; line-height: 1.5; min-height: 36px; }
.level-card .stars { margin-top: 10px; font-size: 14px; letter-spacing: 2px; }
.level-card .best { font-size: 11px; color: var(--text-dim); margin-top: 4px; }
.level-card .trend { font-size: 11px; margin-top: 2px; font-weight: 600; }
.level-card .trend.up { color: var(--good); }
.level-card .trend.down { color: var(--bad); }

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.panel h2 { margin: 0 0 12px; font-size: 16px; }
.muted { color: var(--text-dim); font-size: 13px; margin: 0; }

.weak-key-panel { display: flex; gap: 12px; flex-wrap: wrap; }
.weak-key-chip {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-elev-2);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
}
.weak-key-chip .key {
  font-family: "SF Mono", Consolas, monospace;
  background: var(--bad);
  color: #fff;
  border-radius: 4px;
  padding: 2px 8px;
  font-weight: 700;
}

.practice-head-right { display: flex; align-items: center; gap: 14px; }
.practice-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.practice-title { font-size: 15px; color: var(--text-dim); }
.task-progress { font-family: "SF Mono", Consolas, monospace; color: var(--text-dim); font-size: 13px; }

.progress-track {
  height: 6px;
  border-radius: 3px;
  background: var(--bg-elev-2);
  overflow: hidden;
  margin-bottom: 8px;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width .2s ease;
}

.ghost-row { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.ghost-label { font-size: 12px; font-weight: 700; color: var(--finger-thumb); white-space: nowrap; }
.ghost-track { flex: 1; height: 6px; border-radius: 3px; background: var(--bg-elev-2); overflow: hidden; }
.ghost-fill {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--finger-thumb), var(--accent-2));
  transition: width .35s linear;
}

.btn-link {
  background: none; border: none; color: var(--accent-2);
  cursor: pointer; font-size: 14px; padding: 6px 0;
}

.btn-back-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--bg-elev);
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .15s, color .15s;
  margin-bottom: 16px;
}
.btn-back-pill:hover { border-color: var(--accent); color: var(--accent); }

.target-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 30px 20px;
  margin-bottom: 28px;
  min-height: 100px;
}
.group-row {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 32px;
  letter-spacing: 3px;
  line-height: 1.3;
  word-break: break-all;
  overflow-wrap: anywhere;
  text-align: center;
}
.group-row.done-row { font-size: 22px; opacity: .5; }
.group-row.row-ok { color: var(--good); }
.group-row.row-error { color: var(--text-dim); }
.group-row .err { color: var(--bad); font-weight: 700; }
.group-row.active-row { position: relative; color: var(--text); }
.group-row .row-arrow { color: var(--accent); margin-right: 10px; }
.group-row.placeholder-row { visibility: hidden; }
.group-row.active-row span { border-bottom: 3px solid transparent; }
.target-display .done { color: var(--good); }
.target-display .pending { color: var(--text-dim); }
.target-display .cursor { border-bottom-color: var(--accent); }
.target-display.flash-error { animation: shake .25s; }
.target-display .error-char { color: var(--bad); }

.live-panel {
  position: fixed;
  left: 24px;
  top: 90px;
  width: 168px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  z-index: 20;
}
.live-stat { display: flex; flex-direction: column; gap: 2px; }
.live-stat label { font-size: 11px; color: var(--text-dim); }
.live-stat b { font-family: "SF Mono", Consolas, monospace; font-size: 18px; color: var(--text); }
.live-stat b.good { color: var(--good); }
.live-stat b.bad { color: var(--bad); }
.live-divider { height: 1px; background: var(--border); }

.race-chip {
  margin-top: 2px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}
.race-chip.ahead { background: rgba(72, 187, 120, .15); color: var(--good); }
.race-chip.behind { background: rgba(245, 101, 101, .15); color: var(--bad); }
.race-chip.neutral { background: var(--bg-elev-2); color: var(--text-dim); font-weight: 600; }

.result-race { margin: -8px 0 20px; font-size: 13px; font-weight: 700; }
.result-race.new-record { color: var(--good); }
.result-race.behind-best { color: var(--text-dim); font-weight: 400; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

.keypad {
  position: fixed;
  right: 24px;
  bottom: 24px;
  display: grid;
  grid-template-columns: repeat(4, 76px);
  grid-template-rows: repeat(5, 60px);
  gap: 8px;
  margin: 0;
  z-index: 20;
}

.key {
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 20px;
  font-weight: 600;
  color: #0f1420;
  user-select: none;
  transition: transform .06s, box-shadow .1s;
  box-shadow: 0 3px 0 rgba(0,0,0,.35);
}
.key.finger-index { background: var(--finger-index); }
.key.finger-middle { background: var(--finger-middle); }
.key.finger-ring { background: var(--finger-ring); }
.key.finger-thumb { background: var(--finger-thumb); }
.key.finger-other { background: var(--finger-other); color: #e6ebf5; font-size: 13px; }

.key.active {
  box-shadow: 0 0 0 3px #fff, 0 3px 0 rgba(0,0,0,.35);
  transform: scale(1.05);
}
.key.correct { background: var(--good) !important; color: #fff; transform: translateY(2px); box-shadow: none; }
.key.wrong { background: var(--bad) !important; color: #fff; transform: translateY(2px); box-shadow: none; }

.hint { text-align: center; color: var(--text-dim); font-size: 13px; }

.result-card {
  max-width: 460px;
  margin: 40px auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}
.result-stars { font-size: 36px; letter-spacing: 6px; margin-bottom: 8px; }
.result-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}
.metric { background: var(--bg-elev-2); border-radius: 8px; padding: 14px; }
.metric label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.metric b { font-size: 22px; font-family: "SF Mono", Consolas, monospace; }
.metric span { display: block; font-size: 11px; color: var(--text-dim); }

.result-weak { margin-bottom: 20px; font-size: 13px; color: var(--text-dim); }
.result-weak .key { color: var(--bad); font-weight: 700; font-family: "SF Mono", Consolas, monospace; }

.result-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.btn {
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 14px;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); color: #0f1420; border-color: var(--accent); font-weight: 700; }

@media (max-width: 480px) {
  .keypad { grid-template-columns: repeat(4, 64px); grid-template-rows: repeat(5, 50px); right: 8px; bottom: 8px; }
  .group-row { font-size: 22px; letter-spacing: 2px; }
  .group-row.done-row { font-size: 16px; }
  .stats-bar { gap: 12px; }
  .live-panel { position: static; width: auto; margin-bottom: 16px; }
}

/* ---------- 设置：右下角悬浮齿轮 + 弹窗 ---------- */
.settings-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 70;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0,0,0,.45);
  transition: transform .2s, border-color .2s;
}
.settings-fab:hover { transform: rotate(30deg); border-color: var(--accent); }
.settings-fab.hidden { display: none; }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 80;
  padding: 20px;
}
.settings-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.settings-card h2 { margin: 0 0 6px; font-size: 18px; }
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.settings-row:last-of-type { border-bottom: none; }
.settings-row:has(.segmented) { flex-direction: column; align-items: stretch; gap: 8px; }
.settings-card .btn { width: 100%; margin-top: 14px; }