*{box-sizing:border-box}:root{color-scheme:dark;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#0d1117}body{margin:0;min-height:100vh;background:radial-gradient(circle at 10% 10%,#1f2937 0%,transparent 40%),radial-gradient(circle at 90% 15%,#111827 0%,transparent 45%),linear-gradient(180deg,#0a0f1a,#05080f);color:#e5e7eb}#root{min-height:100vh}.app-shell{min-height:100vh;display:grid;place-items:center;padding:32px 16px}.app-layout{width:100%;display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px;align-items:start}.settings-panel{border:1px solid rgba(148,163,184,.25);border-radius:16px;background:#0f172ac7;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);box-shadow:0 20px 40px #00000073;padding:18px}.settings-panel h2{margin:0 0 14px;font-size:1rem}.speed-control{display:grid;gap:10px;color:#cbd5e1;font-size:.95rem}.speed-control input[type=range]{width:100%}.speed-control strong{font-size:1.2rem;color:#e2e8f0}.timer-block{margin-top:16px;display:grid;gap:6px;color:#cbd5e1;font-size:.95rem}.timer-block strong{font-size:1.5rem;letter-spacing:.08em;color:#f8fafc}.reset-button{margin-top:12px;width:100%;border:1px solid rgba(248,113,113,.6);border-radius:10px;background:#7f1d1d59;color:#fecaca;font-weight:700;padding:10px 12px;cursor:pointer}.reset-button:hover{background:#7f1d1d80}.distance-board{margin-top:16px}.distance-board h3{margin:0 0 10px;font-size:.95rem;color:#cbd5e1}.player-distance-card{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid rgba(148,163,184,.25);border-radius:10px;padding:8px 10px;background:#1e293b73}.player-distance-card+.player-distance-card{margin-top:8px}.player-label-wrap{display:flex;align-items:center;gap:8px;color:#e2e8f0;font-size:.9rem}.player-color-dot{width:10px;height:10px;border-radius:50%;border:1px solid rgba(255,255,255,.35)}.player-distance-card strong{color:#f8fafc;font-size:.95rem}.settings-help{margin:12px 0 0;color:#94a3b8;font-size:.84rem}.game-panel{width:100%;border:1px solid rgba(148,163,184,.25);border-radius:16px;background:#0f172ac7;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);box-shadow:0 20px 40px #00000073;padding:24px}.panel-header{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid rgba(148,163,184,.25)}.panel-header h1{margin:0;font-size:clamp(1.5rem,2vw,2rem);font-weight:700;letter-spacing:.02em}.panel-header p{margin:0;color:#94a3b8;font-size:.95rem}.canvas-frame{border-radius:12px;overflow:hidden;border:1px solid rgba(148,163,184,.3);background:#0f172a;padding:12px}.game-canvas{display:block;width:900px;aspect-ratio:2 / 1;height:500px;margin:0 auto;border-radius:8px}.arrow-keys{width:max-content;margin:12px auto 2px;display:grid;grid-template-columns:repeat(3,46px);gap:8px}.arrow-gap{width:46px;height:40px}.arrow-key{width:46px;height:40px;border-radius:8px;border:1px solid rgba(148,163,184,.4);background:#1e293bbf;color:#cbd5e1;display:grid;place-items:center;font-weight:700;-webkit-user-select:none;user-select:none}.arrow-key.is-active{background:#22c55e;border-color:#16a34a;color:#052e16;box-shadow:0 0 0 1px #22c55e73 inset}@media (max-width: 720px){.app-layout{grid-template-columns:1fr}.game-panel{padding:16px}.panel-header{flex-direction:column;align-items:flex-start;gap:6px}}