.boxes-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    margin: 2rem 0;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.box {
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    position: relative;
}

.box:hover:not(.opened) {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.4);
}

.box-number {
    font-size: 1rem;
    position: absolute;
    top: 5px;
    left: 10px;
    opacity: 0.5;
}

.box.opened {
    background: rgba(255, 255, 255, 0.1);
    border: 2px dashed var(--primary-color);
    transform: scale(0.95);
    cursor: default;
    box-shadow: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.box.opened.bomb {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

@media (max-width: 600px) {
    .boxes-grid { grid-template-columns: repeat(4, 1fr); gap: 10px; }
    .box { font-size: 1.5rem; }
}