:root {
  color-scheme: dark;
  --bg: #10212f;
  --panel: #172635;
  --text: #f6fbff;
  --muted: #b7c6d3;
  --line: rgba(255, 255, 255, 0.14);
  --accent: #ffd166;
  --sky: #54c6eb;
  --leaf: #45d483;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 209, 102, 0.18), transparent 24rem),
    linear-gradient(180deg, #10212f, #071018);
  color: var(--text);
}

a {
  color: inherit;
}

.game-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 1rem;
  width: min(1440px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0;
}

.stage,
.side-panel,
.camera-card,
.control-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(23, 38, 53, 0.88);
}

.stage {
  position: relative;
  display: grid;
  min-height: min(72vh, 720px);
  overflow: hidden;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 560px;
  background: var(--sky);
}

.ui-root {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.overlay-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(430px, calc(100% - 2rem));
  transform: translate(-50%, -50%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(9, 19, 30, 0.88);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  padding: 1.5rem;
  pointer-events: auto;
  text-align: center;
}

.overlay-card h1,
.overlay-card h2 {
  margin: 0 0 0.75rem;
}

.overlay-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  line-height: 1.55;
}

.overlay-button {
  min-height: 2.8rem;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #2a1900;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  padding: 0 1rem;
}

.hud {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  color: #ffffff;
  font-weight: 900;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}

.hud span {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.22);
  padding: 0.55rem 0.75rem;
}

.side-panel {
  align-self: start;
  padding: 1rem;
}

.home-link {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--accent);
  font-weight: 900;
  text-decoration: none;
}

.camera-card {
  overflow: hidden;
  margin-bottom: 1rem;
}

.camera-card__label {
  padding: 0.75rem 0.85rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 900;
  text-transform: uppercase;
}

.camera-card__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #08101a;
}

#debug-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#camera-status {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  max-width: calc(100% - 1.5rem);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.68);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.4rem 0.6rem;
}

#camera-status[data-tone="ready"] {
  color: #8fffd2;
}

#camera-status[data-tone="error"] {
  color: #ffd1d1;
}

.control-card {
  padding: 1rem;
}

.control-card h1 {
  margin: 0 0 0.65rem;
}

.control-card p,
.control-card li {
  color: var(--muted);
  line-height: 1.55;
}

.control-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.site-footer {
  width: min(1440px, calc(100% - 2rem));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding: 1rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 980px) {
  .game-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .game-shell {
    width: calc(100% - 1rem);
    padding-top: 0.5rem;
  }

  #game-canvas {
    min-height: 520px;
  }

  .hud {
    flex-wrap: wrap;
  }
}