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

:root {
    --primary-color: #e11d48;
    --primary-hover: #be123c;
    --primary-light: #fce7f3;
    --accent-color: #0ea5e9;
    --bg-primary: #fafbfc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #fafbfc 0%, #f1f5f9 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.no-select {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.no-drag {
    -webkit-user-drag: none;
    user-select: none;
}

.desktop-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 30px;
    max-width: 1440px;
    margin: 0 auto;
    padding: 30px;
    min-height: calc(100vh - 200px);
}

@media (max-width: 1024px) {
    .desktop-layout {
        grid-template-columns: 1fr;
        padding: 20px;
        gap: 20px;
    }
}

.sidebar {
    position: sticky;
    top: 30px;
    height: fit-content;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 24px 20px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.sidebar-icon {
    font-size: 24px;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.cat-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    transition: all var(--transition-normal);
}

.cat-item:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    transform: translateX(4px);
}

.cat-item.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    border-color: var(--primary-hover);
}

.cat-icon {
    font-size: 20px;
}

.cat-text {
    flex: 1;
}

.sidebar-footer {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-md);
}

.stat-num {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.mobile-cats {
    display: none;
    padding: 0 16px 16px;
}

.mobile-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.mobile-cat {
    padding: 12px 8px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.mobile-cat:active {
    transform: scale(0.98);
}

.mobile-cat.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border-color: var(--primary-color);
}

@media (max-width: 1024px) {
    .sidebar {
        display: none;
    }
    .mobile-cats {
        display: block;
    }
}

@media (max-width: 480px) {
    .mobile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.main-content {
    min-height: calc(100vh - 200px);
}

.content-header {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.content-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.content-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.meta-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    color: var(--accent-color);
    font-size: 13px;
    font-weight: 500;
    border-radius: 20px;
}

.wall-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.wall-grid.single {
    grid-template-columns: 1fr;
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .wall-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}

@media (max-width: 400px) {
    .wall-grid {
        grid-template-columns: 1fr;
    }
}

.wall-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    break-inside: avoid;
}

.wall-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.wall-card:hover .card-img {
    transform: scale(1.05);
}

.card-img {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    background: linear-gradient(135deg, #e2e8f0 0%, #f1f5f9 100%);
    pointer-events: none;
}

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

.card-bottom {
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.tag {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.tag-icon {
    font-size: 14px;
}

.down-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    font-size: 13px;
    font-weight: 600;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(225, 29, 72, 0.3);
}

.down-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(225, 29, 72, 0.4);
}

.down-btn:active {
    transform: scale(0.98);
}

.loading {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    gap: 16px;
}

.loading.show {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.load-more-hint {
    display: none;
    text-align: center;
    padding: 30px;
    color: var(--text-muted);
    font-size: 13px;
}

.load-more-hint::before,
.load-more-hint::after {
    content: '';
    display: inline-block;
    width: 60px;
    height: 1px;
    background: var(--border-color);
    vertical-align: middle;
    margin: 0 16px;
}

.preview-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 20px;
    backdrop-filter: blur(8px);
}

.preview-overlay.show {
    display: flex;
}

.preview-close {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 28px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.preview-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    max-width: 90vw;
    max-height: 90vh;
}

.preview-container img {
    max-width: 100%;
    max-height: calc(90vh - 80px);
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.preview-actions {
    display: flex;
    gap: 16px;
}

.preview-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(225, 29, 72, 0.4);
}

.preview-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(225, 29, 72, 0.5);
}

.site-footer {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: #94a3b8;
    padding: 50px 0 40px;
    text-align: center;
    font-size: 14px;
    margin-top: 80px;
}

.site-footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-footer p {
    margin: 10px 0;
    line-height: 1.8;
}

.site-footer a {
    color: #38bdf8;
    text-decoration: none;
    transition: all 0.3s ease;
}

.site-footer a:hover {
    color: #fff;
    text-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}

.cr-protected {
    display: inline-block;
    padding: 10px 24px;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: 25px;
    color: #e2e8f0;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.5px;
    margin: 12px 0;
}

.footer-brand {
    font-size: 20px;
    color: #f1f5f9;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 16px !important;
}

@media (max-width: 768px) {
    .content-title {
        font-size: 22px;
    }
    
    .preview-close {
        top: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
        font-size: 24px;
    }
    
    .preview-download {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .card-bottom {
        padding: 12px;
    }
    
    .down-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.4s ease forwards;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 16px;
    text-align: center;
}