:root {
  color-scheme: dark;
  --ink: #e9fff7;
  --muted: rgba(233, 255, 247, 0.65);
  --neon: #55ffd2;
  --neon-strong: #b9fff1;
  --accent: #8fd1ff;
  --bg: #05070d;
  --panel: rgba(6, 12, 22, 0.74);
  --panel-strong: rgba(9, 18, 30, 0.92);
  --border: rgba(85, 255, 210, 0.35);
  --glow: rgba(85, 255, 210, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 15%, rgba(33, 74, 68, 0.45), transparent 45%),
    radial-gradient(circle at 80% 8%, rgba(32, 45, 90, 0.4), transparent 55%),
    radial-gradient(circle at 50% 85%, rgba(21, 45, 35, 0.35), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: "Manrope", "Helvetica Neue", Arial, sans-serif;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  touch-action: none;
}

.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(rgba(255, 255, 255, 0.05) 1px, rgba(0, 0, 0, 0) 1px);
  background-size: 100% 4px;
  mix-blend-mode: soft-light;
  opacity: 0.35;
}

.hud {
  position: fixed;
  top: 6vh;
  left: 6vw;
  max-width: min(420px, 88vw);
  z-index: 2;
  pointer-events: none;
}

.hud-inner {
  background: linear-gradient(140deg, rgba(8, 16, 32, 0.85), rgba(6, 10, 20, 0.4));
  border-radius: 18px;
  padding: 1.4rem 1.6rem 1.5rem;
  border: 1px solid rgba(85, 255, 210, 0.16);
  box-shadow: 0 24px 48px rgba(2, 4, 8, 0.45);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
  pointer-events: auto;
}

.hud-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(143, 209, 255, 0.35);
  background: var(--panel);
  color: var(--neon-strong);
  text-transform: uppercase;
  letter-spacing: 0.14rem;
  font-size: 0.6rem;
  cursor: pointer;
  pointer-events: auto;
}

.hud-toggle:focus-visible {
  outline: 2px solid var(--neon-strong);
  outline-offset: 3px;
}

.hud.is-collapsed .hud-content {
  display: none;
}

.hud.is-collapsed .hud-inner {
  padding: 0.85rem 1rem;
}

.hud.is-collapsed .hud-header {
  margin-bottom: 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(85, 255, 210, 0.35);
  background: var(--panel);
  color: var(--neon);
  text-transform: uppercase;
  letter-spacing: 0.18rem;
  font-size: 0.65rem;
  text-decoration: none;
  pointer-events: auto;
}

.back-link:focus-visible {
  outline: 2px solid var(--neon-strong);
  outline-offset: 3px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  font-size: 0.65rem;
  color: var(--neon);
  pointer-events: none;
}

.hud h1 {
  font-family: "Oxanium", "Manrope", sans-serif;
  font-size: clamp(1.7rem, 2.2vw + 1rem, 2.6rem);
  letter-spacing: 0.12rem;
  text-transform: uppercase;
  margin: 0.75rem 0 0.6rem;
}

.hud p {
  margin: 0 0 1.1rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.controls {
  display: grid;
  gap: 1rem;
  pointer-events: auto;
}

.label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.quality-button {
  border: 1px solid rgba(85, 255, 210, 0.35);
  background: var(--panel);
  color: var(--muted);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.2s ease, color 0.2s ease;
}

.quality-button:hover {
  transform: translateY(-1px);
  color: var(--ink);
  border-color: var(--neon-strong);
}

.quality-button.is-active {
  background: var(--panel-strong);
  color: var(--neon-strong);
  border-color: var(--neon-strong);
  box-shadow: 0 0 18px var(--glow);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.7rem;
}

.stat {
  background: rgba(6, 12, 22, 0.7);
  border-radius: 12px;
  border: 1px solid rgba(85, 255, 210, 0.12);
  padding: 0.55rem 0.7rem;
}

.stat .label {
  margin-bottom: 0.25rem;
}

.stat .value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--neon-strong);
}

.legend {
  position: fixed;
  left: 6vw;
  bottom: 6vh;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  z-index: 2;
  pointer-events: none;
}

.legend span {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(85, 255, 210, 0.2);
  background: rgba(6, 12, 22, 0.7);
  font-size: 0.8rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hud {
    left: 5vw;
    right: 5vw;
    max-width: none;
  }

  .legend {
    left: 5vw;
    right: 5vw;
  }
}

@media (max-width: 600px) {
  .hud {
    top: 4vh;
  }

  .hud-inner {
    padding: 1.1rem 1.2rem 1.2rem;
  }

  .hud.is-collapsed .hud-inner {
    padding: 0.75rem 0.9rem;
  }

  .legend {
    bottom: 4vh;
  }
}