:root {
  --bg: #05060f;
  --fg: #eaf0ff;
  --muted: #8f9cc0;
  --accent: #5b8cff;
  --accent2: #b56bff;
  --accent3: #22e6c8;
  --danger: #ff4d6d;
  --gold: #ffd15c;
  /* finger colors */
  --f-pinky: #ff6b8b;
  --f-ring: #ffb35c;
  --f-mid: #ffe45c;
  --f-index: #5cff9d;
  --f-rindex: #5cd8ff;
  --f-rmid: #5c8bff;
  --f-rring: #b56bff;
  --f-rpinky: #ff6bf0;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; color: var(--fg);
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: radial-gradient(1200px 700px at 50% -10%, #141c3a, #05060f 70%), #05060f;
  overflow: hidden;
  user-select: none;
}
.game-shell { display: flex; flex-direction: column; height: 100vh; padding: 10px clamp(8px, 3vw, 26px) 12px; }

/* top bar */
.g-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.g-back { color: var(--muted); text-decoration: none; font-size: 15px; }
.g-back:hover { color: var(--fg); }
.g-title { font-weight: 800; font-size: clamp(16px, 3vw, 22px); letter-spacing: 1px; }
.g-title span { background: linear-gradient(120deg, var(--accent3), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.g-sound { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); color: var(--fg); width: 40px; height: 34px; border-radius: 10px; cursor: pointer; font-size: 16px; }

/* HUD */
.hud { display: flex; gap: clamp(8px, 2vw, 20px); align-items: stretch; margin-bottom: 8px; flex-wrap: wrap; }
.hud-item { background: rgba(18,24,48,0.7); border: 1px solid rgba(255,255,255,0.08); border-radius: 12px; padding: 8px 14px; min-width: 84px; }
.hud-item label { display: block; font-size: 11px; color: var(--muted); letter-spacing: 1px; margin-bottom: 2px; }
.hud-item b { font-size: 22px; font-variant-numeric: tabular-nums; }
.hud-item .combo { color: var(--gold); transition: transform .1s; }
.hud-item.attack { flex: 1; min-width: 150px; }
.hud-item.hp { flex: 1; min-width: 150px; }
.attack-bar, .hp-bar { height: 12px; border-radius: 8px; background: rgba(255,255,255,0.08); overflow: hidden; margin-top: 6px; }
.attack-bar i { display: block; height: 100%; width: 0%; border-radius: 8px; background: linear-gradient(90deg, var(--accent3), var(--gold), var(--danger)); transition: width .12s; }
.hp-bar i { display: block; height: 100%; width: 100%; border-radius: 8px; background: linear-gradient(90deg, #ff4d6d, #ff9d5c); transition: width .25s; }

/* stage */
.stage-wrap { position: relative; flex: 1; border-radius: 16px; overflow: hidden; border: 1px solid rgba(255,255,255,0.08); background: linear-gradient(180deg, #070a1c, #05060f); box-shadow: inset 0 0 120px rgba(90,120,255,0.08); }
#stage { display: block; width: 100%; height: 100%; }
.stage-wrap.shake { animation: shake .28s; }
@keyframes shake {
  0%,100% { transform: translate(0,0); }
  20% { transform: translate(-8px, 4px); }
  40% { transform: translate(7px, -5px); }
  60% { transform: translate(-5px, 3px); }
  80% { transform: translate(4px, -2px); }
}

/* overlays */
.overlay { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(4,6,15,0.82); backdrop-filter: blur(6px); padding: 16px; z-index: 5; }
.overlay.hidden { display: none; }
.panel { max-width: 560px; text-align: center; background: rgba(16,22,44,0.9); border: 1px solid rgba(255,255,255,0.1); border-radius: 20px; padding: 30px 30px 26px; box-shadow: 0 30px 80px rgba(0,0,0,0.6); }
.big-emoji { font-size: 46px; margin-bottom: 6px; }
.panel h1 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 44px); background: linear-gradient(120deg, var(--accent3), var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--fg); line-height: 1.7; margin: 0 0 16px; }
.tips { text-align: left; color: var(--muted); font-size: 14px; line-height: 1.9; margin: 0 auto 20px; max-width: 440px; padding-left: 18px; }
.tips b { color: var(--fg); }
.g-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: 14px; border: none; cursor: pointer;
  font-size: 16px; font-weight: 800; color: #fff; text-decoration: none;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  box-shadow: 0 14px 36px rgba(120,90,255,0.45); margin: 4px;
  transition: transform .08s;
}
.g-btn:active { transform: translateY(2px); }
.g-btn.ghost { background: rgba(255,255,255,0.06); box-shadow: none; border: 1px solid rgba(255,255,255,0.14); }
.final { display: flex; justify-content: center; gap: 26px; margin: 14px 0 8px; flex-wrap: wrap; }
.final label { display: block; font-size: 12px; color: var(--muted); }
.final b { font-size: 30px; color: var(--gold); }
.rank { color: var(--accent3); font-weight: 700; font-size: 18px; min-height: 22px; }

/* keyboard */
.keyboard { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.kb-row { display: flex; gap: 6px; }
.key {
  width: clamp(26px, 4.6vw, 52px); height: clamp(30px, 5vw, 52px);
  display: grid; place-items: center; border-radius: 9px;
  font-weight: 800; font-size: clamp(12px, 2vw, 18px);
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12);
  color: var(--fg); position: relative; transition: transform .06s, background .1s, box-shadow .1s;
  border-bottom-width: 3px;
}
.key .finger-dot { position: absolute; bottom: 3px; width: 7px; height: 3px; border-radius: 2px; opacity: .85; }
.key.target { box-shadow: 0 0 0 2px currentColor, 0 0 18px currentColor; background: rgba(255,255,255,0.12); animation: pulseKey 0.9s infinite; }
@keyframes pulseKey { 0%,100% { filter: brightness(1); } 50% { filter: brightness(1.5); } }
.key.hit { transform: translateY(3px) scale(0.94); background: #fff; color: #1b2340; box-shadow: 0 0 24px #fff; }
.key.wrong { background: var(--danger); color: #fff; box-shadow: 0 0 20px var(--danger); }

/* finger colors */
.f-pinky { color: var(--f-pinky); } .f-ring { color: var(--f-ring); } .f-mid { color: var(--f-mid); } .f-index { color: var(--f-index); }
.rf-index { color: var(--f-rindex); } .rf-mid { color: var(--f-rmid); } .rf-ring { color: var(--f-rring); } .rf-pinky { color: var(--f-rpinky); }
.f-pinky .finger-dot { background: var(--f-pinky); } .f-ring .finger-dot { background: var(--f-ring); }
.f-mid .finger-dot { background: var(--f-mid); } .f-index .finger-dot { background: var(--f-index); }
.rf-index .finger-dot { background: var(--f-rindex); } .rf-mid .finger-dot { background: var(--f-rmid); }
.rf-ring .finger-dot { background: var(--f-rring); } .rf-pinky .finger-dot { background: var(--f-rpinky); }

.finger-legend { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin: 8px 0 0; font-size: 11px; color: var(--muted); }
.finger-legend .lg { padding: 2px 8px; border-radius: 6px; border: 1px solid currentColor; }
.finger-legend .lf-pinky { color: var(--f-pinky); } .finger-legend .lf-ring { color: var(--f-ring); }
.finger-legend .lf-mid { color: var(--f-mid); } .finger-legend .lf-index { color: var(--f-index); }
.finger-legend .rf-index { color: var(--f-rindex); } .finger-legend .rf-mid { color: var(--f-rmid); }
.finger-legend .rf-ring { color: var(--f-rring); } .finger-legend .rf-pinky { color: var(--f-rpinky); }
.g-beian { text-align: center; margin: 6px 0 0; font-size: 11px; display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; align-items: center; }
.g-beian a { color: var(--muted); text-decoration: none; }
.g-beian .beian-gongan { display: inline-flex; align-items: center; gap: 4px; }
.g-beian .beian-gongan img { width: 14px; height: 14px; }

@media (max-height: 720px) {
  .tips { display: none; }
  .finger-legend { display: none; }
}