/* ============================================
   平平的小破站 - 下载站专属样式
   版本: 1.0
   特性: 卡片式资源展示、分类过滤、搜索交互
   ============================================ */

/* === CSS 变量 === */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 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: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

[data-theme="dark"] {
    --primary: #818cf8;
    --primary-light: #a5b4fc;
    --primary-dark: #6366f1;
    --secondary: #f472b6;
    --accent: #22d3ee;
    --accent-light: #67e8f9;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-glass: rgba(15, 23, 42, 0.85);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --border-light: #1e293b;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

/* === 全局重置 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* === 加载进度条 === */
.loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    background: transparent;
}
.loading-progress {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
    transition: width 0.3s ease;
}

/* === 页头 === */
.dl-header {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
}
.dl-header.scrolled {
    box-shadow: var(--shadow-md);
}
.header-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.header-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
}
.header-logo img {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    object-fit: cover;
}
.header-logo .logo-badge {
    font-size: 0.6rem;
    font-weight: 500;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    margin-left: -0.2rem;
    vertical-align: super;
}
.header-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.header-nav a {
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}
.header-nav a:hover,
.header-nav a.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}
.header-nav a.active {
    font-weight: 600;
}

/* === 主题切换 & 移动菜单 === */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition-fast);
}
.theme-toggle:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.06);
}
.mobile-toggle {
    display: none;
    width: 38px;
    height: 38px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.3rem;
    align-items: center;
    justify-content: center;
}

/* === Hero 区域 === */
.dl-hero {
    position: relative;
    padding: 4rem 1rem 3.5rem;
    text-align: center;
    overflow: hidden;
    background:
        radial-gradient(ellipse 900px 500px at 50% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 600px 400px at 80% 100%, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
}
.dl-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 30%, transparent 80%);
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}
.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.8rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* === 搜索框 === */
.search-wrapper {
    position: relative;
    max-width: 560px;
    margin: 0 auto;
}
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.5rem 0.5rem 0.5rem 1.2rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12), var(--shadow-md);
}
.search-box .search-icon {
    color: var(--text-muted);
    font-size: 1rem;
    flex-shrink: 0;
}
.search-box input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
}
.search-box input::placeholder {
    color: var(--text-muted);
}
.search-box .search-clear {
    display: none;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 0.85rem;
    margin-right: 0.25rem;
}
.search-box .search-clear.visible {
    display: block;
}
.search-box .search-btn {
    padding: 0.5rem 1.4rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.search-box .search-btn:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

/* === 统计条 === */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-top: 2.5rem;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}
.stat-item {
    text-align: center;
}
.stat-item .stat-num {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-item .stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

/* === 主要内容区 === */
.dl-main {
    flex: 1;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding) 3rem;
    width: 100%;
}

/* === 分类标签 === */
.category-tabs {
    display: flex;
    gap: 0.5rem;
    margin: 2rem 0 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}
.category-tab {
    padding: 0.55rem 1.2rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.category-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}
.category-tab.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}
.category-tab i {
    font-size: 0.8rem;
}

/* === 资源信息提示 === */
.result-info {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.2rem;
}
.result-info strong {
    color: var(--text-secondary);
}

/* === 资源网格 === */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.2rem;
}

/* === 资源卡片 === */
.resource-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 1.4rem 1.4rem 1.2rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    animation: cardFadeIn 0.5s ease-out both;
}
.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.resource-card:hover::before {
    opacity: 1;
}
.resource-card.hidden {
    display: none;
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 卡片头部 */
.card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.8rem;
}
.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}
.card-icon.blue {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(99, 102, 241, 0.06));
    color: var(--primary);
}
.card-icon.teal {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(6, 182, 212, 0.06));
    color: var(--accent);
}
.card-icon.pink {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.12), rgba(236, 72, 153, 0.06));
    color: var(--secondary);
}
.card-icon.green {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.06));
    color: #10b981;
}
.card-icon.amber {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.06));
    color: #f59e0b;
}
.card-icon.purple {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(139, 92, 246, 0.06));
    color: #8b5cf6;
}

.card-meta {
    flex: 1;
    min-width: 0;
}
.card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
    line-height: 1.4;
}
.card-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 卡片标签 */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.8rem;
}
.card-tag {
    font-size: 0.72rem;
    padding: 0.15rem 0.55rem;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-weight: 500;
}
.card-tag.cat {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

/* 卡片底部 */
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.8rem;
    border-top: 1px solid var(--border-light);
}
.card-info {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.78rem;
    color: var(--text-muted);
}
.card-info span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.card-info i {
    font-size: 0.75rem;
}
.download-link {
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    font-size: 0.82rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    white-space: nowrap;
}
.download-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
    color: #fff;
}
.download-link i {
    font-size: 0.78rem;
}

/* === 空状态 === */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    grid-column: 1 / -1;
}
.empty-state i {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    opacity: 0.5;
}
.empty-state h3 {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}
.empty-state p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* === 页脚 === */
.dl-footer {
    background: var(--bg-primary);
    border-top: 3px solid transparent;
    border-image: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary)) 1;
    padding: 2.5rem 1rem 1.5rem;
    margin-top: auto;
}
.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}
.footer-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}
.footer-brand span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.footer-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}
.footer-social {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 1.2rem;
}
.footer-social a {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}
.footer-social a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.06);
    transform: translateY(-2px);
}
.footer-tech {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.tech-badge {
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-muted);
}
.footer-sep {
    color: var(--border-color);
}
.footer-copyright {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.8;
}
.footer-copyright a {
    color: var(--text-muted);
}
.footer-copyright a:hover {
    color: var(--primary);
}
.footer-icp {
    color: var(--text-muted) !important;
    font-size: 0.78rem;
}
.footer-icp:hover {
    color: var(--primary) !important;
}

/* === 返回顶部 === */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* === 响应式 === */
@media (max-width: 900px) {
    .resources-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .header-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-glass);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 0.5rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
    }
    .header-nav.open {
        display: flex;
    }
    .header-inner {
        position: relative;
    }
    .mobile-toggle {
        display: flex;
    }
    .dl-hero {
        padding: 3rem 1rem 2.5rem;
    }
    .hero-title {
        font-size: 1.8rem;
    }
    .stats-bar {
        gap: 1.5rem;
    }
    .stat-item .stat-num {
        font-size: 1.3rem;
    }
    .resources-grid {
        grid-template-columns: 1fr;
    }
    .category-tabs {
        gap: 0.4rem;
    }
    .category-tab {
        font-size: 0.82rem;
        padding: 0.45rem 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }
    .search-box {
        padding: 0.4rem 0.4rem 0.4rem 1rem;
    }
    .search-box input {
        font-size: 0.85rem;
    }
    .search-box .search-btn {
        padding: 0.4rem 1rem;
        font-size: 0.82rem;
    }
    .resource-card {
        padding: 1rem;
    }
    .card-footer {
        flex-direction: column;
        gap: 0.6rem;
        align-items: stretch;
    }
    .download-link {
        justify-content: center;
    }
}