:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --fg-soft: #6e6e73;
  --border: rgba(0, 0, 0, 0.09);
  --soft: #f5f5f7;
  --accent: #4a4fd4;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  --lift: 0 16px 36px rgba(0, 0, 0, 0.1);
  --radius: 20px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0d;
    --fg: #f5f5f7;
    --fg-soft: #a1a1a6;
    --border: rgba(255, 255, 255, 0.11);
    --soft: #151517;
    --accent: #a8abff;
    --on-accent: #0b0b0d;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    --lift: 0 18px 44px rgba(0, 0, 0, 0.5);
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-height: 2.4rem;
  padding: 0.3rem 0.85rem 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--soft);
  color: var(--fg);
  font-size: 0.88rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.1s ease;
}

.back:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.back:active {
  transform: scale(0.97);
}

.bar-title {
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

main {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.hero {
  padding: 3.5rem 0 2.5rem;
}

.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.lead {
  margin: 0;
  color: var(--fg-soft);
}

.games {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.1rem;
}

.games > li {
  display: flex;
}

.game {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  width: 100%;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--soft);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 0.3s ease,
    border-color 0.3s ease;
}

a.game:hover {
  transform: translateY(-4px);
  box-shadow: var(--lift);
  border-color: var(--accent);
}

a.game:hover .g-title {
  color: var(--accent);
}

.g-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 2.9rem;
  height: 2.9rem;
  border-radius: 15px;
  background: var(--accent);
  background: linear-gradient(
    140deg,
    var(--accent),
    color-mix(in srgb, var(--accent) 52%, var(--bg))
  );
  color: var(--on-accent);
  font-size: 1.15rem;
  font-weight: 600;
}

.g-mark svg {
  width: 62%;
  height: 62%;
  display: block;
}

/* 图标本身是浅色的，所以底色用深色，浅色和深色模式下都成立 */
.g-mark[data-game="gomoku"] {
  background: linear-gradient(150deg, #d9bb8c, #a48154);
}

.g-mark[data-game="snake"] {
  background: linear-gradient(150deg, #1f5c40, #0e2a1d);
}

.g-mark[data-game="tetris"] {
  background: linear-gradient(150deg, #3d4257, #1e2029);
}

.g-body {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.g-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}

.g-desc {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--fg-soft);
}

.badge {
  padding: 0.12rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg-soft);
  font-size: 0.68rem;
  font-weight: 500;
}

.badge.live {
  color: var(--accent);
}

.game.pending {
  opacity: 0.6;
  box-shadow: none;
}

.loading {
  color: var(--fg-soft);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }
  main {
    padding: 0 1.25rem 3rem;
  }
  .hero {
    padding: 2.5rem 0 2rem;
  }
  .games {
    grid-template-columns: 1fr;
  }
}