:root{color-scheme:light;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:#f0f0f0;color:#333}.shell{min-height:100vh;display:grid;place-items:center;padding:2rem}.puzzle-container{display:flex;flex-direction:column;align-items:center}.puzzle-title{margin:0 0 1rem;font-size:1.75rem;font-weight:700;letter-spacing:-.02em}.grid{display:grid;grid-template-columns:repeat(5,60px);gap:4px;background:#333;padding:5px;border-radius:6px}.cell{width:60px;height:60px;background:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:2px;transition:background .15s}.cell.num{background:#bdc3c7;font-weight:700;cursor:default}.cell.bulb{color:#f1c40f;background:#fff}.cell.lit{background:#fff3bf}.bulb-icon{font-size:30px;line-height:1}.reset-btn{margin-top:15px;padding:8px 16px;font-size:1rem;border:1px solid #999;border-radius:4px;background:#fff;cursor:pointer}.reset-btn:hover{background:#e0e0e0}.win-message{margin-top:12px;font-size:1.25rem;font-weight:700;color:#27ae60}