:root {
    --bg: #0d0d0d;
    --bg-card: #141414;
    --bg-overlay: rgba(13, 13, 13, 0.98);
    --text-main: #ffffff;
    --text-muted: #888888;
    --text-dim: #555555;
    --accent: #ff4500;
    --accent-hover: #ff631a;
    --border: #222222;
    --transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: #333333;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Hero Header */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 60px 80px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.hero-left {
    display: flex;
    align-items: center;
    gap: 30px;
}

.profile-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
    background-color: #ffffff;
}

.logo {
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: -1.5px;
    text-transform: uppercase;
    background: linear-gradient(135deg, #ffffff 0%, #a3a3a3 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 400;
    border-left: 2px solid var(--accent);
    padding-left: 24px;
    letter-spacing: 0.5px;
}

.socials {
    display: flex;
    gap: 24px;
    align-items: center;
}

.socials a {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.socials a:hover {
    color: var(--accent);
    transform: translateY(-3px);
}

/* Sticky Filters */
.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px;
    position: sticky;
    top: 0;
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.filter-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 8px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--text-main);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: var(--text-main);
    border-color: var(--text-main);
    color: var(--bg);
}

/* Gallery Grid (Edge-to-Edge Mosaic Layout) */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: 150px; /* Base row unit is 150px, span 2 unit = 300px height */
    gap: 6px;
    padding: 6px;
    max-width: 100%;
    margin: 0;
    background: var(--bg);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    opacity: 0;
    animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    background: #000000;
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 0;
    transition: var(--transition);
}

.gallery-item:hover {
    border-color: var(--accent);
}

/* Hierarchy Grid Layout Structure */
/* Row 1: 1 project, spans full width (12 columns) */
.gallery-grid .gallery-item:nth-child(1) {
    grid-column: span 12;
    grid-row: span 4;
}

/* Row 2: 2 projects (each spans 6 columns) */
.gallery-grid .gallery-item:nth-child(2),
.gallery-grid .gallery-item:nth-child(3) {
    grid-column: span 6;
    grid-row: span 3;
}

/* Row 3: 3 projects (each spans 4 columns) */
.gallery-grid .gallery-item:nth-child(4),
.gallery-grid .gallery-item:nth-child(5),
.gallery-grid .gallery-item:nth-child(6) {
    grid-column: span 4;
    grid-row: span 2;
}

/* Row 4+: 4 projects per row (each spans 3 columns) */
.gallery-grid .gallery-item:nth-child(n+7) {
    grid-column: span 3;
    grid-row: span 2;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.8s ease;
}

.gallery-item:hover img {
    transform: scale(1.04);
    opacity: 0.4;
}

/* Overlay matching site brand */
.gallery-item .overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    color: #ffffff;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
    padding: 30px;
    text-align: center;
}

.gallery-item:hover .overlay {
    opacity: 1;
}

.overlay h3 {
    font-size: 1.8rem;
    font-weight: 800;
    text-transform: uppercase;
    margin-bottom: 6px;
    transform: translateY(15px);
    transition: var(--transition);
    letter-spacing: 1px;
}

.overlay span {
    font-size: 0.85rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
    transform: translateY(15px);
    transition: var(--transition);
    transition-delay: 0.05s;
}

.gallery-item:hover .overlay h3,
.gallery-item:hover .overlay span {
    transform: translateY(0);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.98);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Project Detail View (SPA) */
.project-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-overlay);
    z-index: 500;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    display: block;
}

.project-overlay.show {
    transform: translateY(0);
}

.project-overlay-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 40px 60px;
    position: relative;
}

/* Close & Back Button */
.project-close {
    position: absolute;
    top: 50px;
    left: 40px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-close:hover {
    color: var(--accent);
    transform: translateX(-4px);
}

/* Back to Top Button */
.back-to-top {
    position: fixed !important;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(16px);
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(255, 69, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.back-to-top:active {
    transform: translateY(-1px);
}

/* Project Info & Media Columns */
.project-details {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 60px;
    align-items: start;
}

.project-info {
    position: sticky;
    top: 50px;
}

.project-info h2 {
    font-size: 2.8rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 12px;
    line-height: 1.1;
    background: linear-gradient(135deg, #ffffff 0%, #d6d6d6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.project-category-badge {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 6px 16px;
    border-radius: 4px;
    margin-bottom: 30px;
}

.project-info p {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 40px;
    line-height: 1.7;
}

/* PDF Download buttons */
.project-downloads {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-download {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 14px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    cursor: pointer;
}

.btn-download:hover {
    border-color: var(--accent);
    background: rgba(255, 69, 0, 0.05);
    color: var(--accent);
}

.project-media {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* Video Embedding & Player */
.project-video-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.video-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.video-block:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.video-caption {
    padding: 14px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    background: #111111;
    border-bottom: 1px solid var(--border);
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.video-player-frame {
    background: #000000;
    position: relative;
    width: 100%;
}

.video-player-frame video {
    width: 100%;
    display: block;
    background: #000;
    outline: none;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Gallery Grid inside Project Details */
.project-gallery-grid {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.project-gallery-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.project-gallery-item:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 69, 0, 0.4);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.project-gallery-item img {
    width: 100%;
    display: block;
    height: auto;
    transition: opacity 0.3s;
}

.project-gallery-item:hover img {
    opacity: 0.95;
}

.asset-caption {
    padding: 16px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    background: #111111;
    border-top: 1px solid var(--border);
    letter-spacing: 0.5px;
}

.asset-caption:empty {
    display: none;
}

/* Lightbox Modal styling */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(7, 7, 7, 0.99);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
}

.lightbox.show {
    opacity: 1;
    pointer-events: all;
}

.lightbox img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 6px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transform: scale(0.97);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox.show img {
    transform: scale(1);
}

.lightbox-caption {
    margin-top: 24px;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    text-align: center;
    padding: 0 40px;
}

.lightbox-close {
    position: absolute;
    top: 30px;
    right: 40px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 3.5rem;
    font-weight: 300;
    cursor: pointer;
    transition: var(--transition);
}

.lightbox-close:hover {
    color: var(--accent);
    transform: rotate(90deg);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 3.5rem;
    font-weight: 300;
    cursor: pointer;
    padding: 20px 30px;
    transition: var(--transition);
    user-select: none;
}

.lightbox-nav:hover {
    color: var(--accent);
}

.lightbox-nav.prev {
    left: 20px;
}

.lightbox-nav.next {
    right: 20px;
}

.lightbox-nav.prev:hover {
    transform: translateY(-50%) translateX(-4px);
}

.lightbox-nav.next:hover {
    transform: translateY(-50%) translateX(4px);
}

/* Media Queries for Responsiveness */
@media (max-width: 1024px) {
    .project-overlay-content {
        padding: 100px 30px 40px;
    }

    .project-details {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .project-info {
        position: static;
    }

    .project-info h2 {
        font-size: 2.2rem;
    }

    .project-close {
        top: 40px;
        left: 30px;
    }
}

@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        align-items: flex-start;
        gap: 30px;
        padding: 40px 30px;
    }

    .hero-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .subtitle {
        border-left: none;
        padding-left: 0;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        grid-auto-rows: 240px !important;
        gap: 6px;
        padding: 6px;
    }

    .gallery-grid .gallery-item:nth-child(n) {
        grid-column: span 1 !important;
        grid-row: span 1 !important;
        margin-top: 0 !important;
    }

    .socials {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 30px 20px;
    }

    .logo {
        font-size: 1.8rem;
    }

    .gallery-grid {
        grid-template-columns: 1fr !important;
        grid-auto-rows: 220px !important;
        gap: 6px;
        padding: 6px;
    }

    .gallery-grid .gallery-item:nth-child(n) {
        grid-column: span 1 !important;
        grid-row: span 1 !important;
        margin-top: 0 !important;
    }

    .project-overlay-content {
        padding: 90px 20px 30px;
    }

    .project-close {
        left: 20px;
    }

    .lightbox-close {
        top: 20px;
        right: 20px;
        font-size: 2.5rem;
    }

    .lightbox-nav {
        font-size: 2.5rem;
        padding: 10px 15px;
    }

    .lightbox-nav.prev {
        left: 5px;
    }

    .lightbox-nav.next {
        right: 5px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}