/* ========================================
   MarkMellon — Portfolio & Gallery SPA
   ======================================== */

:root {
    --bg: #FFFFFF;
    --bg-alt: #FAFAFA;
    --fg: #0A0A0A;
    --fg-secondary: #6B6B6B;
    --fg-muted: #999999;
    --accent: #0A0A0A;
    --border: #E8E8E8;
    --border-light: #F2F2F2;
    --skeleton: #F0F0F0;
    --skeleton-shine: #E4E4E4;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Space Grotesk', -apple-system, sans-serif;
    --header-height: 72px;
    --container-max: 1200px;
    --container-padding: 24px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-body); background: var(--bg); color: var(--fg); line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; color: inherit; }

/* --- Header --- */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: var(--header-height); background: rgba(255,255,255,0.92); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-light); }
.header-inner { max-width: var(--container-max); margin: 0 auto; height: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0 var(--container-padding); }
.logo-text { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; }
.header-nav { display: flex; gap: 32px; }
.nav-link { font-size: 0.85rem; font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; color: var(--fg-secondary); transition: color var(--transition-fast); position: relative; }
.nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1.5px; background: var(--fg); transition: width var(--transition-base); }
.nav-link:hover, .nav-link.active { color: var(--fg); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.mobile-menu-btn { display: none; }

/* --- Mobile Menu --- */
.mobile-menu { position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 16px var(--container-padding); z-index: 99; transform: translateY(-110%); transition: transform var(--transition-slow); }
.mobile-menu.open { transform: translateY(0); }
.mobile-nav-link { display: block; padding: 12px 0; font-size: 0.9rem; font-weight: 500; text-transform: uppercase; color: var(--fg-secondary); border-bottom: 1px solid var(--border-light); }

/* --- App Container --- */
.app-container { min-height: 60vh; padding-top: var(--header-height); }

/* --- View Transitions --- */
.view { animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* --- Home View --- */
.hero-section { padding: 80px var(--container-padding); max-width: var(--container-max); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-text h1 { font-family: var(--font-display); font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1.1; margin-bottom: 24px; }
.hero-text p { font-size: 1.1rem; color: var(--fg-secondary); margin-bottom: 32px; }
.btn-primary { display: inline-block; padding: 14px 32px; background: var(--fg); color: var(--bg); border-radius: 100px; font-weight: 500; transition: transform var(--transition-fast); }
.btn-primary:hover { transform: translateY(-2px); }
.hero-card { background: var(--bg-alt); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); aspect-ratio: 4/5; position: relative; }
.hero-card img { width: 100%; height: 100%; object-fit: cover; }

.section-preview { padding: 40px var(--container-padding); max-width: var(--container-max); margin: 0 auto; }
.section-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 40px; }
.section-title { font-family: var(--font-display); font-size: 2rem; font-weight: 700; }
.view-all-link { font-size: 0.85rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; color: var(--fg-secondary); transition: color var(--transition-fast); }
.view-all-link:hover { color: var(--fg); }

/* --- Category Bar --- */
.category-bar { padding-top: 16px; padding-bottom: 16px; position: sticky; top: var(--header-height); z-index: 50; background: rgba(255,255,255,0.9); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-light); }
.category-inner { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none; }
.category-inner::-webkit-scrollbar { display: none; }
.category-pill { flex-shrink: 0; padding: 8px 20px; border-radius: 100px; font-size: 0.8rem; font-weight: 500; letter-spacing: 0.03em; text-transform: uppercase; color: var(--fg-secondary); border: 1px solid var(--border); transition: all var(--transition-fast); white-space: nowrap; }
.category-pill:hover { border-color: var(--fg); color: var(--fg); }
.category-pill.active { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* --- Grids --- */
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.gallery-grid { column-count: 3; column-gap: 16px; }
.gallery-section { max-width: var(--container-max); margin: 0 auto; padding: 24px var(--container-padding) 60px; }

/* --- Project Card --- */
.project-card { background: var(--bg); border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-light); transition: transform var(--transition-base), box-shadow var(--transition-base); }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.project-img-wrap { aspect-ratio: 16/10; overflow: hidden; background: var(--skeleton); }
.project-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.project-card:hover .project-img-wrap img { transform: scale(1.05); }
.project-info { padding: 20px; }
.project-title { font-family: var(--font-display); font-size: 1.4rem; font-weight: 600; margin-bottom: 8px; }
.project-desc { font-size: 0.9rem; color: var(--fg-secondary); margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.project-actions { display: flex; gap: 8px; }
.btn-outline { padding: 8px 16px; border: 1px solid var(--border); border-radius: 100px; font-size: 0.8rem; font-weight: 500; transition: all var(--transition-fast); }
.btn-outline:hover { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* --- Gallery Item --- */
.gallery-item { break-inside: avoid; margin-bottom: 16px; position: relative; border-radius: var(--radius-md); overflow: hidden; cursor: pointer; background: var(--skeleton); }
.gallery-item__image-wrap { position: relative; overflow: hidden; }
.gallery-item__image { width: 100%; display: block; opacity: 0; transition: opacity 0.6s ease, transform var(--transition-slow); }
.gallery-item__image.loaded { opacity: 1; }
.gallery-item:hover .gallery-item__image.loaded { transform: scale(1.03); }
.gallery-item__overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.6), transparent 60%); opacity: 0; transition: opacity var(--transition-base); display: flex; align-items: flex-end; padding: 16px; }
.gallery-item:hover .gallery-item__overlay { opacity: 1; }
.gallery-item__name { color: #fff; font-weight: 500; font-size: 0.9rem; }

/* --- Gallery Skeleton & Loader --- */
.gallery-item__skeleton { width: 100%; background: linear-gradient(110deg, var(--skeleton) 30%, var(--skeleton-shine) 50%, var(--skeleton) 70%); background-size: 200% 100%; animation: skeleton-shimmer 1.5s ease-in-out infinite; }
@keyframes skeleton-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.gallery-loader, .gallery-end { text-align: center; padding: 48px 0; color: var(--fg-muted); font-size: 0.85rem; display: flex; align-items: center; justify-content: center; gap: 10px; }
.loader-spinner { width: 20px; height: 20px; border: 2px solid var(--border); border-top-color: var(--fg); border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.scroll-sentinel { height: 1px; width: 100%; }

/* --- Project Detail View --- */
.project-detail { max-width: 900px; margin: 0 auto; padding: 40px var(--container-padding); }
.project-detail h1 { font-family: var(--font-display); font-size: 3rem; margin-bottom: 16px; }
.project-detail-meta { display: flex; gap: 16px; margin-bottom: 32px; color: var(--fg-muted); font-size: 0.85rem; }
.project-detail-img { width: 100%; border-radius: var(--radius-lg); margin-bottom: 32px; }
.project-detail-content { font-size: 1.1rem; line-height: 1.8; color: var(--fg-secondary); margin-bottom: 40px; }
.project-detail-actions { margin-top: 40px; }

/* --- Contact Form --- */
.contact-container { max-width: 600px; margin: 0 auto; padding: 40px var(--container-padding); }
.contact-form { display: flex; flex-direction: column; gap: 20px; margin-top: 32px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-label { font-size: 0.85rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; color: var(--fg-secondary); }
.form-input, .form-textarea { padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-md); font-family: inherit; font-size: 1rem; background: var(--bg-alt); transition: border-color var(--transition-fast); }
.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--fg); }
.form-textarea { min-height: 150px; resize: vertical; }

/* --- About View --- */
.about-container { max-width: 800px; margin: 0 auto; padding: 40px var(--container-padding); }
.about-container h1 { font-family: var(--font-display); font-size: 3rem; margin-bottom: 24px; }
.about-container p { font-size: 1.1rem; line-height: 1.8; color: var(--fg-secondary); margin-bottom: 20px; }

/* --- Lightbox --- */
.lightbox { position: fixed; inset: 0; z-index: 300; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity var(--transition-base); }
.lightbox.open { opacity: 1; pointer-events: all; }
.lightbox-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.95); }
.lightbox-close, .lightbox-nav { position: absolute; z-index: 310; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; color: #fff; border-radius: 50%; transition: background var(--transition-fast); }
.lightbox-close { top: 20px; right: 20px; }
.lightbox-nav { top: 50%; transform: translateY(-50%); }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }
.lightbox-close:hover, .lightbox-nav:hover { background: rgba(255,255,255,0.1); }
.lightbox-body { position: relative; z-index: 305; display: flex; flex-direction: column; align-items: center; max-width: 90vw; max-height: 90vh; overflow: hidden; }
.lightbox-image-wrap { flex: 1; display: flex; align-items: center; justify-content: center; overflow: hidden; max-height: 70vh; }
.lightbox-image { max-width: 90vw; max-height: 70vh; object-fit: contain; border-radius: var(--radius-sm); transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease; cursor: zoom-in; user-select: none; }
.lightbox-image.zoomed { transform: scale(2); cursor: zoom-out; }
.lightbox-info { width: 100%; max-width: 600px; text-align: center; padding: 20px 0 0; color: #fff; flex-shrink: 0; }
.lightbox-title { font-family: var(--font-display); font-size: 1.4rem; font-weight: 600; margin-bottom: 4px; }
.lightbox-desc { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-bottom: 6px; }
.lightbox-category { display: inline-block; font-size: 0.7rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,0.45); border: 1px solid rgba(255,255,255,0.15); padding: 3px 10px; border-radius: 100px; margin-bottom: 14px; }
.lightbox-actions { display: flex; justify-content: center; gap: 8px; margin-bottom: 16px; }
.lightbox-action-btn { display: flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 100px; font-size: 0.78rem; font-weight: 500; color: rgba(255,255,255,0.7); border: 1px solid rgba(255,255,255,0.15); transition: all var(--transition-fast); }
.lightbox-action-btn:hover { color: #fff; border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.06); }
.lightbox-related { width: 100%; }
.lightbox-related h3 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,0.35); margin-bottom: 10px; }
.related-grid { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; padding-bottom: 4px; }
.related-grid::-webkit-scrollbar { display: none; }
.related-thumb { flex-shrink: 0; width: 64px; height: 64px; border-radius: var(--radius-sm); overflow: hidden; cursor: pointer; opacity: 0.6; transition: opacity var(--transition-fast); }
.related-thumb:hover { opacity: 1; }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; }
.lightbox-counter { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 310; font-size: 0.75rem; color: rgba(255,255,255,0.3); letter-spacing: 0.06em; }

/* --- Share Modal --- */
.share-modal { position: fixed; inset: 0; z-index: 400; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity var(--transition-base); }
.share-modal.open { opacity: 1; pointer-events: all; }
.share-modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(6px); }
.share-modal-content { position: relative; z-index: 405; background: var(--bg); border-radius: var(--radius-lg); padding: 28px; width: 90%; max-width: 420px; box-shadow: var(--shadow-lg); transform: translateY(20px) scale(0.96); transition: transform var(--transition-slow); }
.share-modal.open .share-modal-content { transform: translateY(0) scale(1); }
.share-modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.share-modal-header h3 { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; }
.share-buttons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.share-btn { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 500; transition: all var(--transition-fast); border: 1px solid var(--border); }
.share-btn i { width: 20px; text-align: center; font-size: 1rem; }
.share-fb:hover { background: #1877F2; color: #fff; border-color: #1877F2; }
.share-wa:hover { background: #25D366; color: #fff; border-color: #25D366; }
.share-tg:hover { background: #0088CC; color: #fff; border-color: #0088CC; }
.share-x:hover { background: #000; color: #fff; border-color: #000; }
.share-li:hover { background: #0A66C2; color: #fff; border-color: #0A66C2; }
.share-ig:hover { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); color: #fff; border-color: transparent; }
.share-copy:hover { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.share-copy { grid-column: span 2; justify-content: center; }

/* --- Toast & Back to Top --- */
.toast { position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(80px); z-index: 500; background: var(--fg); color: var(--bg); padding: 12px 24px; border-radius: 100px; font-size: 0.85rem; font-weight: 500; box-shadow: var(--shadow-lg); opacity: 0; transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.back-to-top { position: fixed; bottom: 28px; right: 28px; z-index: 90; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: var(--fg); color: var(--bg); border-radius: 50%; box-shadow: var(--shadow-md); opacity: 0; pointer-events: none; transition: all var(--transition-base); }
.back-to-top.visible { opacity: 1; pointer-events: all; }

/* --- Footer --- */
.site-footer { border-top: 1px solid var(--border); padding: 40px var(--container-padding); background: var(--bg-alt); margin-top: 80px; }
.footer-inner { max-width: var(--container-max); margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; align-items: center; }

/* --- Skeleton Loader --- */
.skeleton-card { background: var(--skeleton); border-radius: var(--radius-md); height: 300px; background-size: 200% 100%; animation: shimmer 1.5s infinite; }
.skeleton-img { height: 200px; border-radius: var(--radius-md); margin-bottom: 16px; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* --- Responsive --- */
@media (max-width: 1200px) {
    .gallery-grid { column-count: 3; }
}
@media (max-width: 900px) {
    .hero-section { grid-template-columns: 1fr; gap: 40px; padding-top: 40px; }
    .gallery-grid { column-count: 2; }
}
@media (max-width: 640px) {
    :root { --header-height: 60px; --container-padding: 16px; }
    .header-nav { display: none; }
    .mobile-menu-btn { display: flex; }
    .gallery-grid { column-count: 1; }
    .portfolio-grid { grid-template-columns: 1fr; }
    .lightbox-nav { width: 40px; height: 40px; }
    .lightbox-prev { left: 8px; }
    .lightbox-next { right: 8px; }
    .lightbox-action-btn span { display: none; }
    .share-buttons { grid-template-columns: 1fr; }
    .share-copy { grid-column: span 1; }
    .footer-inner { flex-direction: column; text-align: center; }
}