:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#0a0a0a;color:#fafafa}.shell{min-height:100vh;display:grid;place-items:center;padding:2rem}.puzzle-container{display:flex;flex-direction:column;align-items:center;gap:1rem}.puzzle-title{margin:0;font-size:1.5rem;font-weight:600;letter-spacing:-.02em}.puzzle-grid{display:grid;grid-template-columns:repeat(4,60px);gap:4px}.puzzle-tile{width:60px;height:60px;border:none;border-radius:6px;background:#333;color:#fafafa;font-size:1.25rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s;padding:0}.puzzle-tile:hover:not(:disabled){background:#555}.puzzle-blank{background:#111;cursor:default}.puzzle-solved{background:#2d6a4f}.puzzle-win{margin:0;color:#52b788;font-weight:600;font-size:1.1rem}.puzzle-reset{border:1px solid rgba(255,255,255,.15);background:transparent;color:#fafafa;padding:.5rem 1.25rem;border-radius:6px;font-size:.9rem;cursor:pointer}.puzzle-reset:hover{background:#ffffff14}