body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(9, 40px);
    grid-template-rows: repeat(9, 40px);
    gap: 2px;
    padding: 10px;
    background-color: #e2e8f0;
}

.cell {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #cbd5e1;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    user-select: none;
    transition: all 0.2s;
}

.cell:hover {
    background-color: #94a3b8;
}

.cell.revealed {
    background-color: #f1f5f9;
}

.cell.flagged {
    background-color: #fecaca;
}

.cell.mine {
    background-color: #ef4444;
    color: white;
}

.number-1 { color: #2563eb; }
.number-2 { color: #16a34a; }
.number-3 { color: #dc2626; }
.number-4 { color: #7c3aed; }
.number-5 { color: #ea580c; }
.number-6 { color: #0891b2; }
.number-7 { color: #000000; }
.number-8 { color: #4b5563; }