/* ============================================
   PhotoShow - 个人素材图文分享站
   设计：简洁干净、响应式、亮暗主题
   ============================================ */

/* --- CSS Reset & Variables --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f0f1f3;
    --text-primary: #1a1a2e;
    --text-secondary: #555770;
    --text-muted: #8e90a6;
    --border-color: #e2e4e9;
    --accent: #4f6ef7;
    --accent-hover: #3b5de7;
    --accent-light: #eef1ff;
    --success: #22c55e;
    --danger: #ef4444;
    --card-bg: #ffffff;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --card-shadow-hover: 0 10px 25px rgba(0,0,0,0.1);
    --header-bg: rgba(255,255,255,0.85);
    --header-blur: blur(12px);
    --footer-bg: #f8f9fa;
    --gradient-hero: linear-gradient(135deg, #f0f4ff 0%, #f8f9fa 50%, #f0f1f3 100%);
    --tag-bg: #f0f1f3;
    --tag-text: #555770;
    --input-bg: #ffffff;
    --input-border: #d1d5db;
}

[data-theme="dark"] {
    --bg-primary: #111118;
    --bg-secondary: #1a1a24;
    --bg-tertiary: #22222e;
    --text-primary: #e8e8ed;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --border-color: #2a2a3a;
    --accent: #6b8aff;
    --accent-hover: #8aa4ff;
    --accent-light: #1e2040;
    --card-bg: #1a1a24;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --card-shadow-hover: 0 10px 25px rgba(0,0,0,0.5);
    --header-bg: rgba(17,17,24,0.85);
    --header-blur: blur(12px);
    --footer-bg: #1a1a24;
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #111118 50%, #1a1a24 100%);
    --tag-bg: #2a2a3a;
    --tag-text: #a0a0b8;
    --input-bg: #1a1a24;
    --input-border: #3a3a4e;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.3s, color 0.3s;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* --- Header --- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: var(--header-bg);
    backdrop-filter: var(--header-blur);
    -webkit-backdrop-filter: var(--header-blur);
    border-bottom: 1px solid var(--border-color);
}
.site-header .container {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex; align-items: center; gap: 8px;
    font-size: 1.25rem; font-weight: 700; color: var(--text-primary);
    text-decoration: none;
}
.logo:hover { color: var(--accent); }
.logo-icon { font-size: 1.5rem; }

.main-nav { display: flex; gap: 8px; }
.nav-link {
    padding: 8px 16px; border-radius: 8px;
    font-size: 0.9rem; color: var(--text-secondary);
    transition: all 0.2s;
}
.nav-link:hover, .nav-link.active {
    background: var(--accent-light); color: var(--accent);
}

.header-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
    width: 40px; height: 40px; border: 1px solid var(--border-color);
    border-radius: 8px; background: var(--bg-secondary);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); background: var(--accent-light); }
[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }

.mobile-menu-btn {
    display: none; flex-direction: column; gap: 5px;
    padding: 8px; background: none; border: none; cursor: pointer;
}
.mobile-menu-btn span {
    display: block; width: 24px; height: 2px;
    background: var(--text-primary); border-radius: 2px; transition: 0.3s;
}

/* --- Hero --- */
.hero {
    background: var(--gradient-hero);
    padding: 80px 0 60px; text-align: center;
}
.hero-title {
    font-size: 2.8rem; font-weight: 800; color: var(--text-primary);
    margin-bottom: 16px; letter-spacing: -0.02em;
}
.hero-title .dot { color: var(--accent); }
.hero-subtitle {
    font-size: 1.15rem; color: var(--text-secondary);
    margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; }

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 24px; border-radius: 8px; border: none;
    font-size: 0.95rem; font-weight: 500; cursor: pointer;
    transition: all 0.2s; text-decoration: none;
}
.btn-primary {
    background: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,110,247,0.3); }
.btn-outline {
    background: transparent; color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-block { width: 100%; justify-content: center; }

/* --- Sections --- */
.section { padding: 64px 0; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 32px; }
.section-title { font-size: 1.6rem; font-weight: 700; color: var(--text-primary); }
.section-more { font-size: 0.9rem; color: var(--accent); }

/* --- Materials Grid --- */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.material-card {
    background: var(--card-bg); border-radius: 12px;
    overflow: hidden; border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none; color: inherit;
}
.material-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}
.card-image {
    position: relative; overflow: hidden;
    aspect-ratio: 4/3; background: var(--bg-tertiary);
}
.card-image img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.4s;
}
.material-card:hover .card-image img { transform: scale(1.05); }
.card-overlay {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.45); display: flex;
    align-items: center; justify-content: center;
    opacity: 0; transition: opacity 0.3s;
}
.material-card:hover .card-overlay { opacity: 1; }
.card-view-icon { font-size: 2rem; color: #fff; }
.card-info { padding: 16px; }
.card-title {
    font-size: 0.95rem; font-weight: 600; color: var(--text-primary);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    margin-bottom: 8px;
}
.card-meta { display: flex; align-items: center; gap: 12px; font-size: 0.82rem; color: var(--text-muted); }
.card-category {
    background: var(--tag-bg); color: var(--tag-text);
    padding: 2px 8px; border-radius: 4px; font-size: 0.78rem;
}

/* --- Categories --- */
.category-section { background: var(--bg-secondary); }
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}
.category-card {
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    padding: 20px 12px; background: var(--card-bg);
    border: 1px solid var(--border-color); border-radius: 12px;
    text-decoration: none; color: var(--text-primary);
    transition: all 0.2s;
}
.category-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--card-shadow-hover); }
.category-icon { font-size: 1.8rem; }
.category-name { font-size: 0.88rem; font-weight: 500; }

/* --- Intro Section --- */
.intro-section { background: var(--bg-secondary); }
.intro-card {
    max-width: 700px; margin: 0 auto; text-align: center;
    padding: 48px 32px; background: var(--card-bg);
    border-radius: 16px; border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}
.intro-card h2 { font-size: 1.5rem; margin-bottom: 16px; color: var(--text-primary); }
.intro-card p { color: var(--text-secondary); margin-bottom: 12px; font-size: 0.95rem; line-height: 1.7; }
.intro-note { font-style: italic; color: var(--accent) !important; margin-bottom: 24px !important; }

/* --- Gallery Page --- */
.gallery-page .gallery-header { display: flex; align-items: baseline; gap: 16px; margin-bottom: 32px; }
.gallery-count { font-size: 0.9rem; color: var(--text-muted); }
.gallery-categories {
    display: flex; flex-wrap: wrap; gap: 8px;
    margin-bottom: 32px; padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}
.cat-tag {
    padding: 6px 16px; border-radius: 20px;
    font-size: 0.88rem; color: var(--text-secondary);
    background: var(--bg-tertiary); transition: all 0.2s;
    text-decoration: none;
}
.cat-tag:hover { background: var(--accent-light); color: var(--accent); }
.cat-tag.active { background: var(--accent); color: #fff; }

/* --- Pagination --- */
.pagination { display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 48px; flex-wrap: wrap; }
.page-btn {
    padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border-color);
    font-size: 0.88rem; color: var(--text-secondary); background: var(--bg-primary);
    transition: all 0.2s; text-decoration: none;
}
.page-btn:hover { border-color: var(--accent); color: var(--accent); }
.page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.page-dots { padding: 8px 4px; color: var(--text-muted); }

/* --- Detail Page --- */
.detail-page .breadcrumb {
    font-size: 0.88rem; color: var(--text-muted); margin-bottom: 32px;
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent); }
.detail-layout { display: grid; grid-template-columns: 1fr 400px; gap: 40px; }
.detail-image-wrap {
    background: var(--bg-tertiary); border-radius: 16px;
    overflow: hidden; border: 1px solid var(--border-color);
}
.detail-image { width: 100%; display: block; }
.detail-info { display: flex; flex-direction: column; gap: 24px; }
.detail-title { font-size: 1.6rem; font-weight: 700; }
.detail-meta { display: flex; flex-direction: column; gap: 12px; }
.meta-item { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; }
.meta-label { color: var(--text-muted); min-width: 70px; }
.meta-value { color: var(--text-primary); }
.meta-value.link { color: var(--accent); }
.detail-desc { padding-top: 16px; border-top: 1px solid var(--border-color); }
.detail-desc h3 { font-size: 0.95rem; margin-bottom: 8px; color: var(--text-primary); }
.detail-desc p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }
.detail-download { padding-top: 16px; border-top: 1px solid var(--border-color); }
.download-btn { width: 100%; justify-content: center; padding: 14px 24px; font-size: 1rem; }
.download-note { font-size: 0.8rem; color: var(--text-muted); text-align: center; margin-top: 8px; }
.detail-nav { display: flex; align-items: center; justify-content: space-between; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border-color); }
.nav-prev, .nav-next {
    max-width: 35%; font-size: 0.88rem; color: var(--text-secondary);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nav-back { color: var(--accent); font-size: 0.88rem; }

/* --- Page Card (About, Contact) --- */
.page-card {
    max-width: 800px; margin: 0 auto;
    background: var(--card-bg); border-radius: 16px;
    padding: 48px; border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}
.page-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 32px; }

/* --- About Page --- */
.about-section { margin-bottom: 36px; }
.about-section h2 { font-size: 1.15rem; font-weight: 600; margin-bottom: 14px; color: var(--text-primary); }
.about-section p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 10px; }
.statement-box {
    background: var(--bg-secondary); border-radius: 12px;
    padding: 24px; border: 1px solid var(--border-color);
}
.statement-box ul { list-style: none; margin-top: 16px; }
.statement-box li { padding: 6px 0; color: var(--text-secondary); font-size: 0.93rem; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat-item {
    text-align: center; padding: 24px 16px;
    background: var(--bg-secondary); border-radius: 12px;
    border: 1px solid var(--border-color);
}
.stat-number { display: block; font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* --- Contact Page --- */
.contact-intro { margin-bottom: 32px; }
.contact-intro p { color: var(--text-secondary); }
.contact-methods { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }
.contact-method {
    display: flex; align-items: flex-start; gap: 16px;
    padding: 20px; background: var(--bg-secondary);
    border-radius: 12px; border: 1px solid var(--border-color);
}
.contact-icon { font-size: 1.6rem; min-width: 44px; text-align: center; }
.contact-detail h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.contact-detail p { color: var(--text-secondary); font-size: 0.92rem; }
.contact-note {
    padding: 16px; background: var(--accent-light);
    border-radius: 8px; border-left: 3px solid var(--accent);
}
.contact-note p { font-size: 0.88rem; color: var(--text-secondary); }

/* --- Error Pages --- */
.error-page .error-card { text-align: center; padding: 80px 24px; }
.error-code { font-size: 6rem; font-weight: 800; color: var(--accent-light); line-height: 1; margin-bottom: 16px; }
.error-card h1 { font-size: 1.5rem; margin-bottom: 12px; }
.error-card p { color: var(--text-secondary); margin-bottom: 24px; }

/* --- Empty State --- */
.empty-state {
    text-align: center; padding: 64px 24px;
}
.empty-icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text-primary); }
.empty-state p { color: var(--text-secondary); font-size: 0.9rem; }
.empty-state.small { padding: 32px 24px; }

/* --- Login Page --- */
.admin-login-page { min-height: 70vh; display: flex; align-items: center; }
.login-card {
    max-width: 400px; margin: 0 auto;
    background: var(--card-bg); border-radius: 16px;
    padding: 40px; border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}
.login-title { font-size: 1.4rem; font-weight: 700; text-align: center; margin-bottom: 28px; }
.login-form { display: flex; flex-direction: column; gap: 16px; }
.login-back { text-align: center; margin-top: 20px; font-size: 0.88rem; }

/* --- Forms --- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.88rem; font-weight: 500; color: var(--text-secondary); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 14px;
    background: var(--input-bg); border: 1px solid var(--input-border);
    border-radius: 8px; font-size: 0.92rem; color: var(--text-primary);
    transition: border-color 0.2s; font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light);
}
.form-row { display: flex; gap: 16px; }
.flex-1 { flex: 1; }
.flex-2 { flex: 2; }
.form-submit { display: flex; align-items: flex-end; }
.form-submit .btn { margin-bottom: 16px; }

/* --- Flash Messages --- */
.flash-message {
    padding: 12px 16px; border-radius: 8px; margin-bottom: 16px;
    font-size: 0.9rem;
}
.flash-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.flash-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* --- Footer --- */
.site-footer {
    margin-top: auto; background: var(--footer-bg);
    border-top: 1px solid var(--border-color); padding: 40px 0 24px;
}
.footer-content {
    display: flex; justify-content: space-between; gap: 32px;
    margin-bottom: 24px; padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}
.footer-name { font-weight: 600; margin-bottom: 6px; }
.footer-desc { font-size: 0.85rem; color: var(--text-muted); max-width: 400px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 0.88rem; color: var(--text-secondary); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); }
.icp-info { font-size: 0.78rem; }

/* --- Responsive --- */
@media (max-width: 900px) {
    .detail-layout { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 768px) {
    .main-nav { display: none; }
    .main-nav.open {
        display: flex; flex-direction: column;
        position: absolute; top: 64px; left: 0; right: 0;
        background: var(--header-bg); backdrop-filter: var(--header-blur);
        padding: 16px; border-bottom: 1px solid var(--border-color);
        gap: 4px;
    }
    .mobile-menu-btn { display: flex; }
    .hero-title { font-size: 2rem; }
    .hero { padding: 48px 0 40px; }
    .page-card { padding: 24px; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
    .stat-item { padding: 16px 8px; }
    .stat-number { font-size: 1.5rem; }
    .footer-content { flex-direction: column; }
    .form-row { flex-direction: column; gap: 0; }
    .category-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
    .masonry-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 1.6rem; }
    .masonry-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .card-info { padding: 10px; }
    .card-title { font-size: 0.82rem; }
    .pagination { gap: 4px; }
    .page-btn { padding: 6px 10px; font-size: 0.82rem; }
    .detail-nav { flex-direction: column; gap: 12px; align-items: center; }
}