:root{--bg: #07080c;--panel: #0f1118;--line: rgba(255, 255, 255, .08);--text: #f3f4f8;--muted: rgba(243, 244, 248, .6);--accent: #ffe14d;--accent-ink: #1a1400;--radius: 14px;color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Noto Sans JP,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}a{color:inherit}.app{min-height:100%;display:flex;flex-direction:column}.top{display:flex;align-items:baseline;gap:16px;padding:14px 20px;border-bottom:1px solid var(--line)}.brand{font-weight:800;letter-spacing:-.02em;text-decoration:none;font-size:18px}.rule-title{color:var(--muted);font-size:13px}.main{flex:1;display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;padding:20px}.stage-wrap{display:flex;flex-direction:column;gap:12px;min-width:0}.question{margin:0;font-size:clamp(18px,2.4vw,28px);font-weight:800;letter-spacing:-.02em}.stage{height:min(calc(100vh - 230px),100%);min-height:320px;display:grid;place-items:center;background:#05060a;border-radius:var(--radius);box-shadow:0 0 80px #78a0ff26 inset}.stage canvas{border-radius:6px}.hud{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}.step .num{font-size:44px;font-weight:900;color:var(--accent);font-variant-numeric:tabular-nums;letter-spacing:-.03em}.step .lab{margin-left:12px;font-weight:700;color:var(--muted);font-size:14px}.period{color:var(--muted);font-size:14px}.period b{color:var(--text)}.back{color:var(--accent);font-weight:900;font-size:24px}.panel{background:var(--panel);border:1px solid 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