:root{--color-primary: #6366f1;--color-secondary: #8b5cf6;--color-active: #fbbf24;--color-success: #22c55e;--color-error: #ef4444;--color-bg: #0f172a;--color-tile: #1e293b;--color-tile-hover: #334155;--color-text: #f8fafc;--color-text-muted: #94a3b8}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;font-size:16px;line-height:1.5}body{min-height:100vh;background:var(--color-bg);color:var(--color-text);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem}h1,h2,h3{font-weight:700;line-height:1.2}button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none;color:inherit}button:disabled{cursor:not-allowed;opacity:.5}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:2px solid 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