:root {
  --bg: #f0efe9;
  --ink: #2a2d33;
  --ink-dim: #858a94;
  --accent: #c24a33;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  --bg: #0e0f12;
  --ink: #d9d4c8;
  --ink-dim: #7a776f;
  --accent: #e26a52;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 13px/1.6 var(--mono);
  -webkit-font-smoothing: antialiased;
}

p { margin: 0; }

#stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

#track { position: relative; width: 1px; pointer-events: none; }

.intro {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  padding: clamp(28px, 9vh, 96px) clamp(16px, 5vw, 56px) 0;
  pointer-events: none;
}

.intro-title {
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.intro-line { color: var(--ink-dim); }

.intro-hint {
  margin-left: 1.2ch;
  color: var(--ink);
  white-space: nowrap;
}

.cursor {
  display: inline-block;
  width: 0.6em;
  height: 1.05em;
  margin-left: 0.4em;
  vertical-align: -0.18em;
  background: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.hud {
  position: fixed;
  top: clamp(16px, 4vh, 40px);
  left: clamp(16px, 5vw, 56px);
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s ease;
  font-variant-numeric: tabular-nums;
}

.hud.on { opacity: 1; }

.hud-title {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--ink-dim);
  margin-bottom: 8px;
}

.hud-body {
  margin: 0;
  font: inherit;
  white-space: pre;
  color: var(--ink);
}

.hud-km {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.hud.final .hud-title { display: none; }

.corner {
  position: fixed;
  right: clamp(16px, 5vw, 56px);
  bottom: clamp(14px, 3vh, 28px);
  z-index: 3;
  display: flex;
  align-items: baseline;
  gap: 20px;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.home, .theme-toggle {
  color: var(--ink-dim);
  text-decoration: none;
  font: inherit;
  letter-spacing: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.theme-toggle::before { content: '['; }
.theme-toggle::after { content: ']'; }

.home:hover, .home:focus-visible,
.theme-toggle:hover, .theme-toggle:focus-visible { color: var(--ink); }

.home:focus-visible, .theme-toggle:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; }

.noscript {
  position: relative;
  z-index: 4;
  padding: 40vh 24px 0;
  text-align: center;
  color: var(--ink-dim);
}

@media (prefers-reduced-motion: reduce) {
  .cursor { animation: none; }
  .hud { transition: none; }
}