:root {
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --glass: rgba(22, 26, 34, 0.52);
  --glass-border: rgba(255, 255, 255, 0.14);
  --text: #fdf6ea;
  --text-dim: rgba(253, 246, 234, 0.62);
  --accent: #ffb84d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  background: #0e1116;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

#app { position: fixed; inset: 0; }
#app canvas { display: block; touch-action: none; cursor: grab; }
#app canvas:active { cursor: grabbing; }

.hud {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
body.ready .hud { opacity: 1; transform: translateY(0); }
body.ready .hud-top { transition-delay: 0.05s; }
body.ready .hud-bottom { transition-delay: 0.14s; }
body.ready .hint { opacity: 1; transform: translateY(0); transition-delay: 0.26s; }

.hud-top {
  top: max(18px, env(safe-area-inset-top));
  left: 22px;
  right: 22px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.title-block {
  padding: 14px 18px;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.title-block h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.title-block .subtitle {
  margin-top: 3px;
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.meters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.meter {
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  min-width: 92px;
}
.meter dt {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}
.meter dd {
  margin-top: 2px;
  font-size: 19px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.meter dd em {
  font-style: normal;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 3px;
}

.hud-bottom {
  bottom: max(16px, env(safe-area-inset-bottom));
  left: 22px;
  right: 22px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  pointer-events: none;
}
.controls, .speed {
  pointer-events: auto;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 10px;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  align-items: center;
}

.ctrl {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: transform 0.16s var(--ease-out), background-color 0.16s var(--ease-out), border-color 0.16s var(--ease-out);
}
.ctrl svg { width: 17px; height: 17px; color: var(--accent); }
.ctrl kbd {
  font-size: 10px;
  font-family: inherit;
  color: var(--text-dim);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 5px;
  padding: 1px 5px;
}
.ctrl:active { transform: scale(0.95); }
.ctrl:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.ctrl.active {
  background: rgba(255, 184, 77, 0.22);
  border-color: rgba(255, 184, 77, 0.55);
}
@media (hover: hover) and (pointer: fine) {
  .ctrl:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-1px);
  }
  .ctrl:hover:active { transform: scale(0.95) translateY(0); }
}

.speed {
  gap: 12px;
  padding: 12px 16px;
  flex-direction: column;
  align-items: stretch;
}
.speed-label {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 150px;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 5px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.16);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -5.5px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.4);
  transition: transform 0.12s var(--ease-out);
}
input[type="range"]::-webkit-slider-thumb:active { transform: scale(1.25); }
input[type="range"]::-moz-range-track {
  height: 5px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.16);
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
}

.hint {
  position: fixed;
  z-index: 10;
  left: 50%;
  bottom: max(10px, env(safe-area-inset-bottom));
  transform: translate(-50%, 8px);
  font-size: 12px;
  color: var(--text-dim);
  background: rgba(22, 26, 34, 0.4);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 7px 14px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  pointer-events: none;
  white-space: nowrap;
}

#intro {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(120% 90% at 50% 0%, rgba(38, 42, 52, 0.42), rgba(16, 19, 25, 0.78));
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  transition: opacity 0.5s var(--ease-out), visibility 0.5s;
}
#intro.hidden { opacity: 0; visibility: hidden; }
.intro-inner { text-align: center; padding: 24px; }
.intro-kicker {
  font-size: 13px;
  letter-spacing: 0.35em;
  color: var(--accent);
  opacity: 0;
  animation: rise 0.6s var(--ease-out) 0.08s forwards;
}
.intro-inner h2 {
  font-size: clamp(38px, 8vw, 64px);
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-top: 10px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.35);
  opacity: 0;
  animation: rise 0.6s var(--ease-out) 0.16s forwards;
}
.intro-sub {
  margin-top: 8px;
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  opacity: 0;
  animation: rise 0.6s var(--ease-out) 0.24s forwards;
}
.start-btn {
  margin-top: 38px;
  padding: 13px 30px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(160deg, #ffc96b, #f59e3f);
  color: #3a2507;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 30px rgba(245, 158, 63, 0.35);
  transition: transform 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out);
  opacity: 0;
  animation: rise 0.6s var(--ease-out) 0.34s forwards;
}
.start-btn:active { transform: scale(0.96); }
@media (hover: hover) and (pointer: fine) {
  .start-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 38px rgba(245, 158, 63, 0.45); }
  .start-btn:hover:active { transform: scale(0.96); }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

#no-webgl {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: #0e1116;
  color: var(--text);
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.vignette {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background: radial-gradient(115% 85% at 50% 42%, transparent 55%, rgba(10, 12, 18, 0.38) 100%);
}
.grain {
  position: fixed;
  inset: 0;
  z-index: 6;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 140px 140px;
}

@media (max-width: 720px) {
  .title-block h1 { font-size: 18px; }
  .meter { min-width: 70px; padding: 8px 10px; }
  .meter dd { font-size: 16px; }
  .hint { display: none; }
  .hud-top { left: 12px; right: 12px; }
  .hud-bottom { left: 12px; right: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .hud { transition: opacity 0.4s var(--ease-out); transform: none; }
  .intro-kicker, .intro-inner h2, .intro-sub, .start-btn { animation: none; opacity: 1; transform: none; }
  #intro { transition: opacity 0.3s; }
}