:root {
  color-scheme: dark;

  /* Canvas / board theme */
  --canvas-bg: #020617;
  --grid-color: #1e293b;
  --grid-line-width: 1;
  --food-color: #ef4444;
  --food-radius-ratio: 0.3;
  --snake-head-color: #38bdf8;
  --snake-body-color: #22c55e;
  --snake-padding: 1;
  --cell-size: 24;

  /* Overlay theme */
  --overlay-bg: rgba(2, 6, 23, 0.8);
  --overlay-text-color: #e2e8f0;
  --overlay-hint-color: #a8b6cc;

  /* Shell theme */
  --shell-bg: #0b1120;
  --card-bg: #020617;
  --hairline: #1e293b;
  --text-color: #e2e8f0;
  --label-color: #94a3b8;
  --hint-color: #7d8ba1;
  --green: #22c55e;
  --green-deep: #04210f;
  --red: #ef4444;
  --step: steps(2, end);
  --step-duration: 90ms;
}

/* Hide elements until Alpine initializes */
[x-cloak] {
  display: none !important;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--shell-bg);
  color: var(--text-color);
  font-family: 'Segoe UI', system-ui, sans-serif;
}

::selection {
  background: rgba(34, 197, 94, 0.35);
  color: #f0fdf4;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.board-shell {
  display: flex;
  gap: 28px;
  align-items: stretch;
}

/* ---- Stat rail ---- */
.stat-rail {
  flex: 0 0 240px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--snake-head-color);
  margin: 0 0 4px;
}

.brand-accent {
  color: var(--green);
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 14px 16px;
  transition: border-color var(--step-duration) var(--step);
}

.stat-card--best {
  border-color: rgba(34, 197, 94, 0.5);
}

.stat-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--label-color);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 34px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.stat-card--best .stat-value {
  color: var(--green);
}

.stat-card--legend {
  font-size: 12px;
  color: var(--label-color);
}

.legend-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}

.legend-row span {
  margin-left: 4px;
}

kbd {
  background: var(--hairline);
  border-radius: 5px;
  padding: 1px 7px;
  font-family: Consolas, monospace;
  font-size: 11px;
  color: var(--text-color);
}

/* ---- Play column ---- */
.play-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.play-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
}

.play-toolbar button {
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  color: var(--text-color);
  border-radius: 10px;
  padding: 9px 22px;
  font-size: 14px;
  cursor: pointer;
  transition: border-color var(--step-duration) var(--step);
}

.play-toolbar button:hover {
  border-color: var(--snake-head-color);
}

.play-toolbar button.hidden {
  display: none;
}

.btn-play,
.overlay-cta {
  background: var(--green);
  border-color: var(--green);
  color: var(--green-deep);
  font-weight: 700;
}

.overlay-cta {
  margin-top: 0.75rem;
  border: none;
  border-radius: 12px;
  padding: 12px 38px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.status-chip {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 6px 14px;
  border: 1px solid var(--hairline);
  color: var(--label-color);
  transition: color var(--step-duration) var(--step), border-color var(--step-duration) var(--step);
}

.status-chip--running {
  color: var(--green);
  border-color: rgba(34, 197, 94, 0.3);
  background: rgba(34, 197, 94, 0.08);
}

.status-chip--paused {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.3);
  background: rgba(251, 191, 36, 0.08);
}

.status-chip--over {
  color: var(--red);
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.08);
}

/* ---- Board ---- */
.canvas-wrapper {
  position: relative;
  max-width: 640px;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--hairline);
  background: var(--canvas-bg);
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 16px;
  background: var(--overlay-bg);
  z-index: 1;
  opacity: 0;
  transition: opacity var(--step-duration) var(--step);
  pointer-events: none;
}

.overlay--visible {
  opacity: 1;
  pointer-events: auto;
}

.overlay-text {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--overlay-text-color);
  text-align: center;
}

.overlay small {
  color: var(--overlay-hint-color);
  text-align: center;
}

.overlay-score {
  font-variant-numeric: tabular-nums;
}

.overlay-alt {
  font-size: 12px;
  color: var(--hint-color);
}

.board-hint {
  font-size: 12px;
  color: var(--hint-color);
  margin: 0;
}

/* ---- Mobile ---- */
@media (max-width: 720px) {
  .board-shell {
    flex-direction: column;
    gap: 16px;
  }

  .stat-rail {
    flex-direction: row;
    flex-wrap: wrap;
    flex: none;
    gap: 10px;
  }

  .brand {
    width: 100%;
    margin: 0;
  }

  .stat-card {
    flex: 1 1 30%;
    padding: 10px 12px;
  }

  .stat-value {
    font-size: 22px;
  }

  .stat-card--legend {
    display: none;
  }

  .play-toolbar button {
    padding: 8px 16px;
  }

  .container {
    padding: 1rem;
  }
}