/* === CSS Custom Properties === */
:root,
body.light {
  --bg-primary: #fef9ef;
  --bg-secondary: #faf3e0;
  --bg-card: #ffffff;
  --bg-card-hover: #fdf6ea;
  --text-primary: #5d4037;
  --text-secondary: #8d6e63;
  --text-muted: #bcaaa4;
  --border-color: #e8d5b0;
  --border-light: #f0e4cc;
  --accent: #c17f59;
  --accent-light: #d4a57a;
  --shadow-sm: 0 1px 3px rgba(93, 64, 55, 0.08);
  --shadow-md: 0 2px 8px rgba(93, 64, 55, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.2s ease;
}

body.dark {
  --bg-primary: #1e1814;
  --bg-secondary: #2a211c;
  --bg-card: #332a24;
  --bg-card-hover: #3d322b;
  --text-primary: #e8d5c8;
  --text-secondary: #c4a88c;
  --text-muted: #8a7565;
  --border-color: #4a3d33;
  --border-light: #3d322b;
  --accent: #d4a57a;
  --accent-light: #c17f59;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.35);
}

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  transition: background var(--transition), color var(--transition);
}

/* === Top Bar === */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.top-bar-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

.back-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 16px;
  text-decoration: none;
  transition: background var(--transition);
}

.back-btn:hover {
  background: var(--bg-card-hover);
}

/* === Theme Toggle === */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 18px;
  transition: background var(--transition), transform var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  transform: rotate(15deg);
}

/* === Game Cards === */
.game-category { padding: 0 16px; margin-bottom: 20px; }

.category-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  padding-left: 4px;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

.game-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.game-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-light);
}

.game-card:active { transform: scale(0.97); }

.game-card-icon { font-size: 36px; line-height: 1; }

.game-card-name { font-size: 14px; font-weight: 600; color: var(--text-primary); }

.game-card-desc { font-size: 11px; color: var(--text-muted); }

/* === Main Container === */
.container { max-width: 640px; margin: 0 auto; padding: 20px 0 40px; }

/* === Page Header === */
.page-header { text-align: center; padding: 28px 16px 8px; }

.page-header h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.page-header .subtitle { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* === Footer === */
.page-footer { text-align: center; padding: 24px 16px 32px; font-size: 12px; color: var(--text-muted); }

/* === Game Canvas Container === */
.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  gap: 12px;
}

.game-canvas {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
}

.game-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 15px;
  color: var(--text-secondary);
}

.game-btn {
  padding: 10px 24px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font-family);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.game-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.game-btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.game-btn.primary:hover { background: var(--accent-light); }

/* === Score Display === */
.score-display { font-size: 18px; font-weight: 700; color: var(--accent); }

/* === Responsive === */
@media (min-width: 640px) {
  .game-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 380px) {
  .game-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .game-card { padding: 16px 8px; }
  .game-card-icon { font-size: 30px; }
}