:root {
  --bg: #0d0f16;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-border: rgba(255, 255, 255, 0.12);
  --text: #e8ecff;
  --muted: #9aa3c4;
  --accent: #7cf6f0;
  color-scheme: dark;
}

[data-theme="light"] {
  --panel: rgba(255, 255, 255, 0.78);
  --panel-border: rgba(0, 0, 0, 0.1);
  --text: #1a1d2e;
  --muted: #5a6380;
  --accent: #0891b2;
  color-scheme: light;
}

[data-theme="light"] body {
  background: radial-gradient(circle at 20% 20%, #dde8f5, #f0f4f8 40%),
    radial-gradient(circle at 80% 10%, #e8e0f5, transparent 40%),
    radial-gradient(circle at 50% 80%, #d8eef0, transparent 45%), #f0f4f8;
}

[data-theme="light"] .snake-cell {
  border-color: rgba(0, 0, 0, 0.07);
  background: rgba(0, 0, 0, 0.025);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Space Grotesk', 'Segoe UI', sans-serif;
  background: radial-gradient(circle at 20% 20%, #182235, #0d0f16 40%), radial-gradient(circle at 80% 10%, #1c1232, transparent 40%), radial-gradient(circle at 50% 80%, #113034, transparent 45%), #0d0f16;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.shell {
  width: min(540px, 100%);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 20px;
  display: grid;
  gap: 12px;
}

.top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 30px;
}

.ghost-link {
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
}

.meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.06);
}

.snake-board {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  gap: 2px;
  width: min(460px, 100%);
  aspect-ratio: 1 / 1;
  direction: ltr;
}

.snake-cell {
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.03);
}

.snake-cell.snake {
  background: #7cf6f0;
}

.snake-cell.food {
  background: #ff7d7d;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 600;
  color: #081019;
  background: linear-gradient(135deg, #7cf6f0, #64c6ff);
  cursor: pointer;
}

button.ghost {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.controls {
  display: grid;
  gap: 8px;
  justify-items: center;
  width: min(220px, 100%);
}

.mid-controls {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
}

.snake-control {
  width: 100%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.kbd-guide {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.kbd-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

kbd {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 7px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.08);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

[data-theme="light"] kbd {
  background: rgba(0, 0, 0, 0.05);
}