/* ============================================
   Project Page Styles
   ============================================ */

/* Project Header */
.project-header {
    padding: 140px 0 60px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-btn);
    margin-bottom: 32px;
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--color-btn-hover);
}

.project-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.project-category {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-btn);
}

.project-year {
    font-size: 0.875rem;
    color: var(--color-muted);
}

.project-year::before {
    content: '•';
    margin-right: 16px;
}

.project-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 24px;
}

.project-subtitle {
    font-size: 1.25rem;
    color: var(--color-muted);
    max-width: 700px;
    line-height: 1.6;
}

/* Project Hero Image */
.project-hero {
    padding: 0 0 80px;
}

.hero-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

.expand-btn {
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.6);
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

.hero-image:hover .expand-btn,
.gallery-item:hover .expand-btn {
    opacity: 1;
}

.expand-btn:hover {
    background-color: var(--color-btn);
}

/* Project Description */
.project-description {
    padding: 0 0 80px;
}

.description-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
}

@media (min-width: 1024px) {
    .description-grid {
        grid-template-columns: 2fr 1fr;
        gap: 80px;
    }
}

.description-main h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.description-main p {
    font-size: 1.0625rem;
    color: var(--color-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.description-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.detail-item:last-child {
    border-bottom: none;
}

.detail-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-muted);
}

.detail-value {
    font-size: 1rem;
    font-weight: 500;
}

/* Project Gallery */
.project-gallery {
    padding: 0 0 80px;
}

.gallery-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 32px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    grid-auto-rows: minmax(150px, auto);
    grid-auto-flow: dense;
}

/* Gallery Item Base */
.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    background: var(--color-surface);
}

/* Size Variants - Desktop */
.gallery-item.large {
    grid-column: span 4;
}

.gallery-item.wide {
    grid-column: span 4;
}

.gallery-item.medium {
    grid-column: span 3;
}

.gallery-item.portrait {
    grid-column: span 2;
    grid-row: span 2;
}

.gallery-item.square {
    grid-column: span 2;
    grid-row: span 1;
    aspect-ratio: 1/1;
}

.gallery-item.mobile {
    grid-column: span 2;
    grid-row: span 2;
}

.gallery-item.gdn-leaderboard {
    grid-column: span 6;
    aspect-ratio: 728/90;
}

.gallery-item.gdn-rectangle {
    grid-column: span 2;
    aspect-ratio: 300/250;
}

.gallery-item.gdn-skyscraper {
    grid-column: span 1;
    grid-row: span 3;
    aspect-ratio: 160/600;
}

/* Tablet breakpoint */
@media (max-width: 1024px) {
    .gallery-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .gallery-item.large,
    .gallery-item.wide {
        grid-column: span 4;
    }
    
    .gallery-item.medium {
        grid-column: span 2;
    }
    
    .gallery-item.portrait,
    .gallery-item.mobile {
        grid-column: span 2;
    }
    
    .gallery-item.gdn-leaderboard {
        grid-column: span 4;
    }
}

/* Mobile breakpoint */
@media (max-width: 639px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: auto;
    }
    
    .gallery-item.large,
    .gallery-item.wide,
    .gallery-item.gdn-leaderboard {
        grid-column: span 2;
    }
    
    .gallery-item.medium,
    .gallery-item.portrait,
    .gallery-item.square,
    .gallery-item.mobile,
    .gallery-item.gdn-rectangle {
        grid-column: span 1;
        grid-row: span 1;
    }
    
    .gallery-item.gdn-skyscraper {
        grid-column: span 1;
        grid-row: span 1;
    }
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

/* Preserve aspect ratio for specific formats */
.gallery-item[data-aspect] img {
    object-fit: contain;
    background: var(--color-bg);
}

.gallery-item:hover img {
    transform: scale(1.02);
}

/* Image dimension badge (optional, for admin reference) */
.gallery-item .size-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 4px 8px;
    font-size: 0.625rem;
    font-weight: 500;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    border-radius: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.gallery-item:hover .size-badge {
    opacity: 1;
}

/* Project Content */
.project-content {
    padding: 0 0 80px;
}

.content-block {
    max-width: 800px;
    margin-bottom: 48px;
}

.content-block:last-child {
    margin-bottom: 0;
}

.content-block h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.content-block p {
    font-size: 1.0625rem;
    color: var(--color-muted);
    line-height: 1.7;
}

/* Project Navigation */
.project-nav {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
}

.nav-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: center;
}

@media (max-width: 768px) {
    .nav-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .nav-item.all {
        grid-column: span 2;
        order: -1;
        margin-bottom: 16px;
    }
}

.nav-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px 0;
    transition: color var(--transition-fast);
}

.nav-item.prev {
    align-items: flex-start;
}

.nav-item.next {
    align-items: flex-end;
}

.nav-item .nav-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.nav-item .nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-item.next .nav-btn {
    flex-direction: row-reverse;
}

.nav-item .nav-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-btn);
    font-size: 1rem;
    color: var(--color-btn);
    transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
    flex-shrink: 0;
}

.nav-item.prev:hover .nav-arrow {
    background-color: var(--color-btn);
    border-color: var(--color-btn);
    color: #ffffff;
    transform: translateX(-4px);
}

.nav-item.next:hover .nav-arrow {
    background-color: var(--color-btn);
    border-color: var(--color-btn);
    color: #ffffff;
    transform: translateX(4px);
}

.nav-item.prev:hover .nav-title,
.nav-item.next:hover .nav-title {
    color: var(--color-btn);
}

.nav-item.prev:hover .nav-label,
.nav-item.next:hover .nav-label {
    color: var(--color-btn);
}

.nav-item.all {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-btn);
    padding: 12px 20px;
    border: 1px solid var(--color-btn);
    border-radius: var(--radius-full);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-item.all:hover {
    background-color: var(--color-btn);
    color: #ffffff;
}

.nav-label {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-muted);
    transition: color var(--transition-fast);
}

/* ============================================
   Lightbox
   ============================================ */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
    z-index: 10;
}

.lightbox-close:hover {
    opacity: 1;
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast), background-color var(--transition-fast);
    z-index: 10;
}

.lightbox-prev {
    left: 24px;
}

.lightbox-next {
    right: 24px;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .lightbox-prev,
    .lightbox-next {
        width: 44px;
        height: 44px;
    }
    
    .lightbox-prev {
        left: 12px;
    }
    
    .lightbox-next {
        right: 12px;
    }
}

.lightbox-content {
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.lightbox-counter {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    z-index: 10;
}

/* Prevent scroll when lightbox is open */
body.lightbox-open {
    overflow: hidden;
}