/* ============================================
   COLLECTION PREVIEW SECTION
   Design Philosophy: Opening gallery doors
                      into distinct visual worlds
   Aesthetic: Chanel boutique × Photography exhibition
   ============================================ */

/* Import shared design tokens from hero */
:root {
    /* Colors - Luxury Palette */
    --color-bg-primary: #0d0d0d;
    --color-bg-secondary: #1a1a1a;
    --color-bg-card: rgba(255, 255, 255, 0.03);

    --color-text-primary: #f5f5f5;
    --color-text-secondary: #c4c4c4;
    --color-text-muted: #8a8a8a;

    /* Accent Colors */
    --color-accent-gold: #d4af37;
    --color-accent-bronze: #cd7f32;
    --color-accent-warm: #e8d5b7;

    /* Collection-Specific Accents */
    --color-collection-color: #4a9eff; /* Cool blue for color collection */
    --color-collection-bw: #a8a8a8;    /* Elegant gray for B&W */

    /* Typography */
    --font-serif: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    /* Transitions */
    --ease-luxury: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-gentle: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --duration-fast: 300ms;
    --duration-medium: 600ms;
    --duration-slow: 900ms;

    /* Shadows */
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   SECTION STRUCTURE
   ============================================ */

.collection-preview {
    position: relative;
    width: 100%;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background-color: var(--color-bg-primary);
    overflow: hidden;
}

/* Section Header */
.collection-preview__header {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
    animation: fadeInUp 1s var(--ease-luxury) forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.collection-preview__subtitle {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent-gold);
    margin-bottom: var(--spacing-sm);
}

.collection-preview__title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.collection-preview__description {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.collection-preview__break {
    display: none;
}

@media (min-width: 768px) {
    .collection-preview__break {
        display: block;
    }
}

/* ============================================
   COLLECTION GRID
   ============================================ */

.collection-preview__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 1s var(--ease-luxury) 0.3s forwards;
    opacity: 0;
}

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

@media (min-width: 968px) {
    .collection-preview__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
}

/* ============================================
   COLLECTION CARD
   ============================================ */

.collection-card {
    position: relative;
    height: 600px;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--duration-medium) var(--ease-luxury);
    box-shadow: var(--shadow-lg);
}

.collection-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
}

/* Image Wrapper & Parallax Layers */
.collection-card__image-wrapper {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.collection-card__image {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: transform var(--duration-slow) var(--ease-luxury),
                opacity var(--duration-medium) var(--ease-luxury);
}

.collection-card__image--1 {
    z-index: 1;
    opacity: 1;
}

.collection-card__image--2 {
    z-index: 2;
    opacity: 0;
}

.collection-card:hover .collection-card__image--1 {
    transform: scale(1.08);
}

.collection-card:hover .collection-card__image--2 {
    opacity: 1;
    transform: scale(1.08);
}

/* Gradient Overlay */
.collection-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(13, 13, 13, 0.3) 0%,
        rgba(13, 13, 13, 0.6) 50%,
        rgba(13, 13, 13, 0.95) 100%
    );
    z-index: 3;
    transition: background var(--duration-medium) var(--ease-luxury);
}

.collection-card:hover .collection-card__overlay {
    background: linear-gradient(
        180deg,
        rgba(13, 13, 13, 0.2) 0%,
        rgba(13, 13, 13, 0.5) 50%,
        rgba(13, 13, 13, 0.9) 100%
    );
}

/* Content */
.collection-card__content {
    position: relative;
    z-index: 4;
    height: 100%;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

/* Badge */
.collection-card__badge {
    position: absolute;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    transition: all var(--duration-fast) var(--ease-luxury);
}

.collection-card:hover .collection-card__badge {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.collection-card__badge-icon {
    color: var(--color-accent-gold);
}

/* Title */
.collection-card__title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    transition: transform var(--duration-medium) var(--ease-luxury);
}

.collection-card:hover .collection-card__title {
    transform: translateY(-4px);
}

/* Color collection title accent */
.collection-card--color .collection-card__title {
    color: var(--color-collection-color);
}

/* B&W collection title accent */
.collection-card--bw .collection-card__title {
    color: var(--color-text-primary);
}

/* Description */
.collection-card__description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    max-width: 400px;
    transition: opacity var(--duration-fast) var(--ease-luxury);
}

.collection-card:hover .collection-card__description {
    opacity: 0.9;
}

/* Stats */
.collection-card__stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.collection-card__stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.collection-card__stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.collection-card__stat-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-accent-gold);
}

/* CTA Button */
.collection-card__cta {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-primary);
    text-decoration: none;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--duration-fast) var(--ease-luxury);
    align-self: flex-start;
}

.collection-card:hover .collection-card__cta {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(212, 175, 55, 0.4);
    transform: translateX(8px);
}

.collection-card__cta-icon {
    transition: transform var(--duration-fast) var(--ease-luxury);
}

.collection-card:hover .collection-card__cta-icon {
    transform: translateX(4px);
}

/* ============================================
   HOVER GALLERY REVEAL
   ============================================ */

.collection-card__gallery {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 5;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transform: translateX(20px);
    transition: all var(--duration-medium) var(--ease-luxury);
    pointer-events: none;
}

.collection-card:hover .collection-card__gallery {
    opacity: 1;
    transform: translateX(0);
}

.collection-card__gallery-item {
    width: 80px;
    height: 120px;
    background-size: cover;
    background-position: center;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: transform var(--duration-fast) var(--ease-luxury);
}

.collection-card__gallery-item:hover {
    transform: scale(1.05);
}

.collection-card__gallery-item:nth-child(1) {
    transition-delay: 0s;
}

.collection-card__gallery-item:nth-child(2) {
    transition-delay: 0.05s;
}

.collection-card__gallery-item:nth-child(3) {
    transition-delay: 0.1s;
}

/* ============================================
   FOOTER - VIEW ALL LINK
   ============================================ */

.collection-preview__footer {
    margin-top: var(--spacing-xl);
    text-align: center;
    animation: fadeIn 1s var(--ease-luxury) 0.6s forwards;
    opacity: 0;
}

.collection-preview__view-all {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 1rem 2rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all var(--duration-fast) var(--ease-luxury);
}

.collection-preview__view-all:hover {
    color: var(--color-accent-gold);
    border-color: rgba(212, 175, 55, 0.4);
    background: rgba(255, 255, 255, 0.03);
    transform: translateY(-2px);
}

.collection-preview__view-all svg {
    transition: transform var(--duration-fast) var(--ease-luxury);
}

.collection-preview__view-all:hover svg {
    transform: rotate(90deg);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 968px) {
    .collection-preview {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .collection-card {
        height: 500px;
    }

    .collection-card__gallery {
        display: none; /* Hide gallery thumbnails on mobile */
    }
}

@media (max-width: 640px) {
    .collection-card {
        height: 450px;
    }

    .collection-card__content {
        padding: var(--spacing-md);
    }

    .collection-card__badge {
        top: var(--spacing-md);
        left: var(--spacing-md);
    }

    .collection-card__title {
        font-size: 2rem;
    }

    .collection-card__description {
        font-size: 0.9375rem;
    }

    .collection-card__stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .collection-card__cta {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

.collection-card:focus-visible,
.collection-card__cta:focus-visible,
.collection-preview__view-all:focus-visible {
    outline: 2px solid var(--color-accent-gold);
    outline-offset: 4px;
}

/* Ensure cards are keyboard accessible */
.collection-card {
    -webkit-tap-highlight-color: transparent;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .collection-preview {
        background: white;
        color: black;
    }

    .collection-card__overlay {
        display: none;
    }
}