:root {
  --bg0: #0f172a;
  --bg1: #1e293b;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(148, 163, 184, 0.2);
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent-fish: #2dd4bf;
  --accent-flight: #f472b6;
  --accent-xq: #fbbf24;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 100% 80% at 50% -20%, rgba(45, 212, 191, 0.12), transparent 55%),
    radial-gradient(ellipse 80% 60% at 100% 50%, rgba(244, 114, 182, 0.08), transparent 45%),
    radial-gradient(ellipse 60% 50% at 0% 80%, rgba(251, 191, 36, 0.1), transparent 50%),
    linear-gradient(165deg, var(--bg0) 0%, var(--bg1) 50%, #0c1222 100%);
}

.shell {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.site-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.site-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.site-header p {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.6;
}

.game-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.game-card {
  display: flex;
  flex-direction: column;
  border-radius: 16px;
  padding: 1.35rem 1.25rem 1.25rem;
  text-decoration: none;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.2s ease;
}

.game-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.game-card:focus-visible {
  outline: 2px solid var(--accent-fish);
  outline-offset: 3px;
}

.game-card .icon {
  width: 3rem;
  height: 3rem;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 0.85rem;
}

.game-card.fish .icon {
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.35), rgba(14, 116, 144, 0.4));
  color: #99f6e4;
}

.game-card.flight .icon {
  background: linear-gradient(135deg, rgba(244, 114, 182, 0.35), rgba(168, 85, 247, 0.35));
  color: #fbcfe8;
}

.game-card.xiangqi .icon {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.35), rgba(234, 88, 12, 0.35));
  color: #fde68a;
}

.game-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.game-card p {
  margin: 0 0 1rem;
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
}

.game-card .cta {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-fish);
}

.game-card.flight .cta {
  color: #f9a8d4;
}

.game-card.xiangqi .cta {
  color: #fcd34d;
}

.site-footer {
  margin-top: 3rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}