/* ═══════════════════════════════════════════
   design.css — Design showcase & modal (OPTIMIZED)
   ═══════════════════════════════════════════ */

.design {
    background-color: var(--bg);
}

/* ── Grid ── */
.design-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

/* ── Card ── */
.design-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    /* Initial state - hidden */
    opacity: 0;
    transform: translateY(60px) scale(0.95);
    transition: all 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);  /* Bouncy easing */
    will-change: transform, opacity;  /* GPU acceleration hint */
}

/* When card becomes visible */
.design-card.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Hover state - only when visible */
.design-card.visible:hover {
    transform: translateY(-10px) scale(1);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;  /* Faster hover transition */
}

/* Staggered animation delays */
.design-card:nth-child(1).visible { transition-delay: 0s; }
.design-card:nth-child(2).visible { transition-delay: 0.15s; }
.design-card:nth-child(3).visible { transition-delay: 0.3s; }
.design-card:nth-child(4).visible { transition-delay: 0.45s; }
.design-card:nth-child(5).visible { transition-delay: 0.6s; }
.design-card:nth-child(6).visible { transition-delay: 0.75s; }

/* ── Image wrapper ── */
.design-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;  /* Reserve space - prevents layout shift */
    overflow: hidden;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
    border-radius: 12px;
}

/* Loading shimmer effect */
.design-image-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
    animation: shimmer 2s ease-in-out infinite;
    z-index: 2;
    pointer-events: none;
}

.design-image-wrapper.loaded::before {
    display: none;  /* Remove shimmer when loaded */
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

.design-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    backface-visibility: hidden;  /* Smoother transforms */
    transform: translateZ(0);     /* Force GPU acceleration */
}

.design-card.visible:hover .design-image {
    transform: scale(1.1) translateZ(0);
}

/* ── Overlay ── */
.design-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.1) 0%,
        rgba(0, 0, 0, 0.8) 100%
    );
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 1;
}

.design-card.visible:hover .design-overlay {
    opacity: 1;
}

.design-overlay-content {
    text-align: center;
    color: #fff;
    padding: 1.5rem;
    transform: translateY(20px);
    transition: transform 0.4s ease;
}

.design-card.visible:hover .design-overlay-content {
    transform: translateY(0);
}

.design-overlay-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.design-overlay-desc {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.btn-view {
    background-color: var(--primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-view:hover {
    background-color: var(--primary-dark);
    transform: scale(1.08);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

/* ── Card info ── */
.design-info {
    padding: 1.5rem;
}

.design-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-strong);
    margin-bottom: 1rem;
}

.design-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* ── Modal ── */
.design-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s ease;
}

.design-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.design-modal-content {
    position: relative;
    background-color: var(--card-bg);
    border-radius: 15px;
    width: 90%;
    max-width: 1200px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.design-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text);
    font-size: 2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--ease), transform var(--ease);
    z-index: 10;
}

.design-modal-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.design-modal-body {
    padding: 2rem;
}

.design-modal-header {
    text-align: center;
    margin-bottom: 2rem;
}

.design-modal-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-strong);
    margin-bottom: 0.5rem;
}

.design-modal-header p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.design-modal-images {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.design-modal-image {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

/* ═══════════════════════════════════════════
   Responsive Design
   ═══════════════════════════════════════════ */

@media (max-width: 768px) {
    .design-image-wrapper {
        aspect-ratio: 4 / 3;  /* Better for tablets */
    }
    
    .design-card {
        transform: translateY(40px) scale(0.96);
    }
    
    .design-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .design-image-wrapper {
        aspect-ratio: 1 / 1;  /* Square for mobile */
    }
    
    .design-grid {
        grid-template-columns: 1fr;  /* Single column */
        gap: 1.25rem;
    }
    
    .design-card {
        transform: translateY(30px) scale(0.97);
    }
    
    /* Faster stagger on mobile */
    .design-card:nth-child(1).visible { transition-delay: 0s; }
    .design-card:nth-child(2).visible { transition-delay: 0.1s; }
    .design-card:nth-child(3).visible { transition-delay: 0.2s; }
    .design-card:nth-child(4).visible { transition-delay: 0.3s; }
}

/* ═══════════════════════════════════════════
   Performance Optimizations
   ═══════════════════════════════════════════ */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .design-card {
        transition: opacity 0.3s ease;
        transform: none;
    }
    
    .design-card.visible {
        transform: none;
    }
    
    .design-image {
        transition: none;
    }
    
    .design-image-wrapper::before {
        animation: none;
    }
}