.cell{width:28px;height:28px;border:1px solid #374151;background:var(--card);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;cursor:pointer;-webkit-user-select:none;user-select:none}.cell:hover{background:#4b5563}.cell.open{background:#1f2937}.cell.flagged{background:#374151;color:red}.cell.open.mine{background:#ef4444}.board{display:inline-block;background:var(--tile-bg);padding:10px;border-radius:10px;box-shadow:0 2px 8px #00000080}.board-row{display:flex}:root{--bg: #0f1724;--card: #0b1220;--accent: #06b6d4;--tile-bg: #1b2636}body{margin:0;font-family:Inter,Arial,sans-serif;background:linear-gradient(180deg,var(--bg),#071023 120%);color:#e6f4f1;min-height:100vh;display:flex;align-items:center;justify-content:center}.app{max-width:800px;padding:20px;background:#ffffff0d;border-radius:12px;box-shadow:0 8px 30px #00000080;text-align:center}.controls{margin-bottom:15px;display:flex;gap:20px;justify-content:center;align-items:center}.footer{margin-top:20px;padding:15px;font-size:14px;color:#ccc;text-align:center;border-top:1px solid #333}.footer h2{margin-bottom:8px;font-size:16px;color:#fc0}.footer p{margin:4px 0}:root{--bg: #0f1724;--card: #0b1220;--accent: #06b6d4;--safe: #e6f4f1;--danger: #ff6b6b;--tile-bg: #1b2636;--tile-border: #10151b}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,Arial,sans-serif;background:linear-gradient(180deg,var(--bg),#071023 120%);color:var(--safe);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}