/* ============================================
   光影集 - 摄影作品展示站
   深色主题 · 瀑布流 · 极简风格
   ============================================ */

:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-card: #161618;
    --bg-hover: #1c1c1f;
    --text-primary: #e8e6e3;
    --text-secondary: #8a8785;
    --text-muted: #5a5856;
    --accent: #c8a96e;
    --accent-dim: rgba(200, 169, 110, 0.15);
    --border: rgba(255, 255, 255, 0.06);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font-serif: 'Noto Serif SC', 'Georgia', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--bg-primary);
}

/* ---- 导航 ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 2rem;
    transition: background var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.375rem 0.875rem;
    border-radius: 100px;
    transition: all var(--transition);
    letter-spacing: 0.02em;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--bg-primary);
    background: var(--accent);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(200, 169, 110, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(200, 169, 110, 0.04), transparent),
        var(--bg-primary);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.015'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 300;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s 0.3s forwards;
}

.hero-desc {
    font-size: clamp(0.875rem, 2vw, 1.0625rem);
    font-weight: 300;
    color: var(--text-secondary);
    margin-top: 1.25rem;
    letter-spacing: 0.2em;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 1s 0.6s forwards;
}

.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    opacity: 0;
    animation: fadeUp 1s 1s forwards;
}

.hero-scroll svg {
    animation: float 2s ease-in-out infinite;
}

/* ---- Gallery Section ---- */
.gallery-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem 6rem;
}

/* 瀑布流网格 */
.gallery-grid {
    columns: 4;
    column-gap: 16px;
}

.gallery-item {
    break-inside: avoid;
    margin-bottom: 16px;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    background: var(--bg-card);
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.gallery-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.gallery-item img {
    width: 100%;
    display: block;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), filter 0.6s ease;
}

.gallery-item:hover img {
    transform: scale(1.04);
    filter: brightness(0.75);
}

.gallery-item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem 1.25rem 1.25rem;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 100%);
    opacity: 0;
    transform: translateY(8px);
    transition: all var(--transition);
}

.gallery-item:hover .gallery-item-overlay {
    opacity: 1;
    transform: translateY(0);
}

.gallery-item-title {
    font-family: var(--font-serif);
    font-size: 0.9375rem;
    font-weight: 500;
    color: #fff;
    margin-bottom: 0.375rem;
}

.gallery-item-location {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.65);
    letter-spacing: 0.03em;
}

/* ---- Lightbox ---- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

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

.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    -webkit-backdrop-filter: blur(30px);
    backdrop-filter: blur(30px);
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    z-index: 10;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    outline: none;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.15);
}

.lightbox-close {
    top: 1.5rem;
    right: 1.5rem;
}

.lightbox-prev {
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-content {
    position: relative;
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-img {
    max-width: 100%;
    max-height: 72vh;
    object-fit: contain;
    border-radius: var(--radius-lg);
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.4s ease 0.1s, transform 0.4s ease 0.1s;
}

.lightbox.open .lightbox-img {
    opacity: 1;
    transform: scale(1);
}

.lightbox-info {
    margin-top: 1.5rem;
    text-align: center;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease 0.2s, transform 0.4s ease 0.2s;
}

.lightbox.open .lightbox-info {
    opacity: 1;
    transform: translateY(0);
}

.lightbox-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.lightbox-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.meta-item svg {
    opacity: 0.5;
    flex-shrink: 0;
}

/* ---- Footer ---- */
.footer {
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8125rem;
    letter-spacing: 0.05em;
}

/* ---- Animations ---- */
@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ---- Responsive ---- */
@media (max-width: 1200px) {
    .gallery-grid { columns: 3; }
}

@media (max-width: 768px) {
    .gallery-grid { columns: 2; column-gap: 10px; }
    .gallery-item { margin-bottom: 10px; }

    .nav { padding: 0 1rem; }
    .nav-links { gap: 0; }
    .nav-link { font-size: 0.75rem; padding: 0.25rem 0.625rem; }

    .gallery-section { padding: 2rem 1rem 4rem; }

    .lightbox-prev { left: 0.75rem; }
    .lightbox-next { right: 0.75rem; }

    .lightbox-title { font-size: 1.0625rem; }
    .lightbox-meta { gap: 1rem; }
    .meta-item { font-size: 0.75rem; }
}

@media (max-width: 480px) {
    .gallery-grid { columns: 1; column-gap: 0; }
    .gallery-item { margin-bottom: 12px; border-radius: var(--radius-lg); }

    .nav-links { display: none; }

    .hero-title { letter-spacing: 0.08em; }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }