:root {
  color-scheme: light dark;
  --bg: #0b1520;
  --panel: #101f2f;
  --card: #16283a;
  --text: #eff7ff;
  --muted: #a9bacb;
  --line: #2b4156;
  --accent: #42c7b9;
  --accent-text: #041310;
  --good: #78d89a;
  --bad: #ff8b8b;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, ui-sans-serif, system-ui, sans-serif; background: var(--bg); color: var(--text); }
main { width: min(900px, 100%); margin: 0 auto; padding: 24px; }
.game-shell { display: grid; gap: 18px; }
.game-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center; }
.stats { display: grid; grid-template-columns: repeat(4, minmax(90px, 1fr)); gap: 10px; }
.stat { border: 1px solid var(--line); background: var(--panel); border-radius: 12px; padding: 10px; }
.stat span { display: block; color: var(--muted); font-size: .8rem; }
.stat strong { font-size: 1.3rem; }
.card { border: 1px solid var(--line); background: var(--panel); border-radius: 16px; padding: 18px; }
.prompt { font-size: clamp(1.25rem, 3vw, 2rem); margin: 0 0 16px; }
.subprompt { color: var(--muted); margin: 0 0 16px; }
.controls { display: grid; gap: 10px; }
button, input, select { font: inherit; }
button { border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 12px; padding: 12px 14px; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: transparent; font-weight: 700; }
button:disabled { opacity: .5; cursor: not-allowed; }
input, select { width: 100%; border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 12px; padding: 12px; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; }
.feedback { min-height: 2.8em; color: var(--muted); }
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }
.progress { height: 10px; border-radius: 999px; background: var(--card); overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--accent); width: 100%; transform-origin: left; }
.hidden { display: none !important; }
.result-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; }
.small { color: var(--muted); font-size: .9rem; }
@media (max-width: 640px) {
  main { padding: 14px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .choice-grid, .result-grid { grid-template-columns: 1fr; }
}


.node-bank, .chain { display: grid; gap: 10px; }
.node-bank { grid-template-columns: repeat(2,minmax(0,1fr)); }
.node-button { text-align: left; }
.node-button strong, .chain-item strong { display:block; }
.node-button span, .chain-item span { color: var(--muted); font-size:.82rem; }
.chain { counter-reset: chain; }
.chain-item { border:1px solid var(--line); background:var(--card); border-radius:12px; padding:10px; display:flex; justify-content:space-between; gap:10px; align-items:center; }
.chain-item::before { counter-increment:chain; content:counter(chain); display:grid; place-items:center; min-width:28px; height:28px; border-radius:999px; background:var(--accent); color:var(--accent-text); }
.chain-actions { display:flex; gap:8px; flex-wrap:wrap; }
@media(max-width:640px){.node-bank{grid-template-columns:1fr;}}
.leaderboard{display:grid;gap:.65rem;margin:1rem 0 0;padding:0;list-style:none}.leaderboard li{display:flex;justify-content:space-between;gap:1rem;padding:.85rem 1rem;border:1px solid var(--line);border-radius:.8rem;background:var(--card)}.leaderboard li span{color:var(--muted)}.leaderboard-card h2{margin:.35rem 0}
.game-nav{display:flex;gap:1.2rem;align-items:center;padding:1rem max(1rem,calc((100% - 1100px)/2));border-bottom:1px solid var(--line)}.game-nav a{color:var(--muted);text-decoration:none}.game-nav a:first-child{margin-right:auto;color:var(--text)}.game-guide{max-width:1100px;margin:0 auto 4rem;padding:1.5rem;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.game-guide p{color:var(--muted);line-height:1.65}