:root{--panel: rgba(16, 42, 67, .88);--panel-border: rgba(255, 255, 255, .12);--text: #f1f5f9;--muted: #9fb3c8;--accent: #ffd166;--good: #52b788;--bad: #e63946;font-family:system-ui,-apple-system,Segoe UI,sans-serif;font-size:14px;color:var(--text)}*{box-sizing:border-box}[hidden]{display:none!important}html,body{margin:0;height:100%;overflow:hidden;background:#123d5c;-webkit-user-select:none;user-select:none}#game{position:fixed;top:0;right:0;bottom:0;left:0}#game canvas{display:block}#ui{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none}#ui>*{pointer-events:auto}button{font:inherit;color:var(--text);background:#ffffff14;border:1px solid var(--panel-border);border-radius:6px;padding:6px 10px;cursor:pointer;min-height:32px}button:hover:not(:disabled){background:#ffffff2e}button.active,button.active:hover:not(:disabled){background:var(--accent);color:#102a43;border-color:var(--accent)}button:disabled{opacity:.4;cursor:not-allowed}.panel{position:absolute;background:var(--panel);border:1px solid var(--panel-border);border-radius:10px;padding:12px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.topbar{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--panel);border-bottom:1px solid var(--panel-border);flex-wrap:wrap}.topbar .title{display:flex;flex-direction:column}.topbar .title strong{font-size:18px;color:var(--accent)}.topbar .difficulty{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}.modal-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#06142199;display:grid;place-items:center}.modal{position:static;width:min(420px,calc(100% - 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