/* ═══════════════════════════════════════════
   JIHOON CHUNG — PHOTOGRAPHY PORTFOLIO
   ═══════════════════════════════════════════ */

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

:root {
    --bg: #0a0a0a;
    --bg-elevated: #111;
    --text: #e8e8e8;
    --text-muted: #777;
    --accent: #fff;
    --border: #1a1a1a;
    --transition: 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-fast: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 300;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-family: inherit;
}

img {
    display: block;
    max-width: 100%;
}

/* ── Navigation ─────────────────────────── */

#nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    background: linear-gradient(to bottom, rgba(10,10,10,0.95) 0%, rgba(10,10,10,0) 100%);
    pointer-events: none;
}

#nav > * {
    pointer-events: auto;
}

.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    transition: opacity var(--transition-fast);
}

.nav-logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-link.active::after {
    width: 100%;
}

/* ── Views ──────────────────────────────── */

.view {
    display: none;
    min-height: 100vh;
    padding-top: 6rem;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.view.active {
    display: block;
}

.view.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Home: Projects Grid ────────────────── */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2px;
    padding: 0 2px 2px;
}

.project-card {
    position: relative;
    aspect-ratio: 3 / 2;
    overflow: hidden;
    cursor: pointer;
}

.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.25, 0.1, 0.25, 1), filter 0.5s ease;
    filter: brightness(0.85);
}

.project-card:hover img {
    transform: scale(1.04);
    filter: brightness(0.6);
}

.project-card-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2.5rem;
    opacity: 0;
    transition: opacity var(--transition);
}

.project-card:hover .project-card-overlay {
    opacity: 1;
}

.project-card-title {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.project-card-meta {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* Stagger animation for cards */
.project-card {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInCard 0.6s ease forwards;
}

.project-card:nth-child(1) { animation-delay: 0.05s; }
.project-card:nth-child(2) { animation-delay: 0.15s; }
.project-card:nth-child(3) { animation-delay: 0.25s; }
.project-card:nth-child(4) { animation-delay: 0.35s; }
.project-card:nth-child(5) { animation-delay: 0.45s; }
.project-card:nth-child(6) { animation-delay: 0.55s; }

@keyframes fadeInCard {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Project Detail ─────────────────────── */

.project-header {
    padding: 0 3rem 3rem;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    transition: color var(--transition-fast);
}

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

.project-title {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.project-description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.project-count {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* Gallery layout — masonry-like with CSS columns */
.project-gallery {
    column-count: 3;
    column-gap: 2px;
    padding: 0 2px;
}

.gallery-item {
    break-inside: avoid;
    margin-bottom: 2px;
    cursor: pointer;
    overflow: hidden;
    position: relative;
}

.gallery-item img {
    width: 100%;
    display: block;
    transition: transform 0.6s cubic-bezier(0.25, 0.1, 0.25, 1), filter 0.4s ease;
    filter: brightness(0.9);
}

.gallery-item:hover img {
    transform: scale(1.03);
    filter: brightness(1);
}

/* Stagger animation for gallery items */
.gallery-item {
    opacity: 0;
    animation: fadeInGallery 0.5s ease forwards;
}

@keyframes fadeInGallery {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── About ──────────────────────────────── */

.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding: 4rem 3rem;
    min-height: calc(100vh - 6rem);
    align-items: center;
}

.about-image-placeholder {
    width: 100%;
    aspect-ratio: 3/4;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}

.about-text h1 {
    font-family: 'Playfair Display', serif;
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    max-width: 480px;
}

.about-contact {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.about-contact p {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.about-contact a {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    transition: opacity var(--transition-fast);
}

.about-contact a:hover {
    opacity: 0.6;
}

/* ── Lightbox ───────────────────────────── */

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.96);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    font-size: 2rem;
    color: var(--text-muted);
    transition: color var(--transition-fast);
    z-index: 10;
}

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

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    padding: 1rem;
    transition: color var(--transition-fast);
    z-index: 10;
}

.lightbox-prev { left: 1rem; }
.lightbox-next { right: 1rem; }

.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--accent);
}

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

.lightbox-img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox-img.loaded {
    opacity: 1;
}

.lightbox-caption {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* ── Footer ─────────────────────────────── */

#footer {
    padding: 3rem;
    text-align: center;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* ── Responsive ─────────────────────────── */

@media (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .project-gallery {
        column-count: 2;
    }

    .project-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    #nav {
        padding: 1.25rem 1.5rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-header {
        padding: 0 1.5rem 2rem;
    }

    .project-gallery {
        column-count: 2;
    }

    .project-title {
        font-size: 2rem;
    }

    .project-card-title {
        font-size: 1.5rem;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem 1.5rem;
    }

    .about-text h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .project-gallery {
        column-count: 1;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .project-card-overlay {
        opacity: 1;
    }

    .project-card img {
        filter: brightness(0.65);
    }
}