:root {
  --bg: #0f1117;
  --bg-elev: #171a23;
  --panel: #1e222e;
  --text: #e6e9f0;
  --muted: #9aa3b2;
  --accent: #4ade80;
  --accent-2: #38bdf8;
  --snake-body: #3fbf6f;
  --danger: #f87171;
  --border: #2a2f3d;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --maxw: 960px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }

/* Catalog */
.catalog { max-width: var(--maxw); margin: 0 auto; padding: 32px 20px 64px; }
.catalog__head h1 { margin: 0 0 4px; font-size: 2rem; letter-spacing: -0.02em; }
.catalog__head p { margin: 0 0 28px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
}
.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  color: var(--text);
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card__art {
  font-size: 2.4rem; height: 84px; display: flex; align-items: center; justify-content: center;
  background: var(--bg-elev); border-radius: 10px; margin-bottom: 12px;
}
.card h2 { margin: 0 0 4px; font-size: 1.15rem; }
.card p { margin: 0 0 10px; color: var(--muted); font-size: 0.92rem; }
.card__play { color: var(--accent); font-weight: 600; }
.catalog__foot { margin-top: 36px; font-size: 0.85rem; }

/* Game shell */
.game { max-width: 560px; margin: 0 auto; padding: 24px 16px 56px; }
.game__header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 8px;
}
.game__header h1 { margin: 0; font-size: 1.5rem; flex: 1; }
.back { font-size: 0.9rem; }
.hud { display: flex; align-items: center; gap: 14px; font-size: 0.9rem; color: var(--muted); }
.hud b { color: var(--text); }
.hint { color: var(--muted); font-size: 0.9rem; margin: 4px 0 16px; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.btn--primary { background: var(--accent); color: #06210f; border-color: var(--accent); font-weight: 600; }
.btn--ghost { background: transparent; padding: 8px 10px; }

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --bg-elev: #ffffff;
    --panel: #ffffff;
    --text: #14181f;
    --muted: #5b6472;
    --border: #d7dce5;
    --shadow: 0 8px 30px rgba(20, 24, 31, 0.12);
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}