:root{--bg: #0f1419;--surface: #1a2332;--surface-2: #243044;--text: #e8eef7;--muted: #8b9cb3;--accent: #3dd68c;--accent-dim: #2a9d63;--danger: #ff6b6b;--snake: #3dd68c;--snake-head: #7cf0b8;--food: #ff6b6b;--border: #2f4058;--shadow: 0 12px 40px rgba(0, 0, 0, .35)}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Space Grotesk,system-ui,sans-serif;background:radial-gradient(circle at top,#1b2a3d 0%,var(--bg) 55%),var(--bg);color:var(--text)}.app{max-width:960px;margin:0 auto;padding:2rem 1.25rem 3rem}.header{text-align:center;margin-bottom:2rem}.header h1{margin:0;font-size:clamp(2rem,5vw,3rem);letter-spacing:.08em;text-transform:uppercase}.subtitle{margin:.5rem 0 0;color:var(--muted)}.main{display:grid;gap:1.5rem}@media(min-width:820px){.main{grid-template-columns:1fr 280px;align-items:start}}.game-panel,.leaderboard-panel{background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow)}.game-panel{position:relative;padding:1.25rem}.hud{display:flex;gap:1rem;margin-bottom:1rem}.stat{flex:1;background:var(--surface-2);border-radius:12px;padding:.75rem 1rem}.label{display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.value{display:block;margin-top:.25rem;font-family:JetBrains Mono,monospace;font-size:1.5rem;font-weight:700;color:var(--accent)}#game{display:block;width:100%;max-width:400px;margin:0 auto;border-radius:12px;background:#0b1017;border:2px solid var(--border);image-rendering:pixelated}.overlay{position:absolute;top:1.25rem;right:1.25rem;bottom:1.25rem;left:1.25rem;display:grid;place-items:center;background:#0b1017d1;border-radius:12px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.overlay.hidden{display:none}.overlay-card{text-align:center;padding:1.5rem;max-width:320px}.overlay-card h2{margin:0 0 .5rem}.overlay-card p{margin:0 0 1rem;color:var(--muted)}.score-form{display:grid;gap:.75rem;margin-bottom:1rem;text-align:left}.score-form.hidden{display:none}.score-form label{font-size:.85rem;color:var(--muted)}.score-form input{width:100%;padding:.65rem .75rem;border-radius:8px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font:inherit}.score-form .btn{width:100%;padding:.9rem 1.25rem;font-size:1.05rem}.btn{border:none;border-radius:999px;padding:.75rem 1.25rem;font:inherit;font-weight:600;cursor:pointer;transition:transform .15s ease,background .15s ease}.btn:hover{transform:translateY(-1px)}.btn.primary{background:var(--accent);color:#062015}.btn.primary:hover{background:var(--accent-dim)}.controls{margin:1rem 0 0;text-align:center;font-size:.85rem;color:var(--muted)}.leaderboard-panel{padding:1.25rem}.leaderboard-panel h2{margin:0 0 1rem;font-size:1.1rem}.leaderboard{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}.leaderboard li{display:grid;grid-template-columns:1.5rem 1fr auto;gap:.5rem;align-items:center;padding:.6rem .75rem;background:var(--surface-2);border-radius:10px;font-size:.95rem}.leaderboard li.loading,.leaderboard li.empty{grid-template-columns:1fr;text-align:center;color:var(--muted)}.leaderboard .rank{font-family:JetBrains Mono,monospace;color:var(--muted)}.leaderboard .name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.leaderboard .score{font-family:JetBrains Mono,monospace;font-weight:700;color:var(--accent)}.status{margin-top:.75rem;font-size:.85rem;color:var(--muted)}.status.hidden{display:none}.status.error{color:var(--danger)}