body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f8f9fa;
}
#config-screen, #game-screen {
    text-align: center;
    width: 90%;
    max-width: 600px;
}
#game-grid {
    display: inline-grid;
    gap: 2px;
    background-color: #BDBDBD;
    padding: 2px;
    border-radius: 8px;
    margin: 1rem 0;
}
.grid-cell {
    background-color: white;
    border: 2px solid #BDBDBD;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s;
}
.grid-cell.empty { background-color: #E0E0E0; border-color: #BDBDBD; }
.grid-cell.selected { background-color: lightblue; transform: scale(1.1); }
.grid-cell.correct { border-color: #2E7D32; }
.grid-cell.wrong { border-color: #C62828; }
.base-1 { color: #D32F2F; } .base-2 { color: #1976D2; } .base-3 { color: #388E3C; }
.base-4 { color: #7B1FA2; } .base-5 { color: #F57C00; } .base-6 { color: #0097A7; }
.base-7 { color: #C2185B; } .base-8 { color: #6D4C41; } .base-9 { color: #455A64; }

.hidden {
    display: none;
}