/* Custom Styles for Memory Game */

/* Safe Area Padding for Modern Mobile Devices */
.safe-padding {
    padding-top: calc(12px + env(safe-area-inset-top));
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    padding-left: calc(12px + env(safe-area-inset-left));
    padding-right: calc(12px + env(safe-area-inset-right));
}

/* 3D Card Flip Mechanics */
.perspective {
    perspective: 1000px;
}

.transform-style-3d {
    transform-style: preserve-3d;
}

.backface-hidden {
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.rotate-y-180 {
    transform: rotateY(180deg);
}

/* Active buttons styling */
.theme-btn, .diff-btn {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.1);
    color: #94a3b8;
}

.theme-btn:hover, .diff-btn:hover {
    background-color: rgba(255, 255, 255, 0.06);
    color: #f8fafc;
}

.theme-btn.active {
    background-color: rgba(245, 158, 11, 0.1);
    border-color: #f59e0b;
    color: #fbbf24;
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.15);
}

.diff-btn.active {
    background-color: rgba(245, 158, 11, 0.1);
    border-color: #f59e0b;
    color: #fbbf24;
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.15);
}

/* Card Flip Classes */
.game-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.game-card.matched .card-front {
    border-color: #10b981;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 95, 70, 0.2) 100%);
    color: #34d399;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
}

/* Smooth custom glassmorphism */
.glass-panel {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
}