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

/* 关键渲染路径优化 - 减少首屏渲染阻塞 */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* 确保页面至少占满整个视口高度 */
}

/* 性能优化：使用 will-change 提示浏览器优化动画 */
.animate-on-scroll {
    will-change: opacity, transform;
}

/* 性能优化：使用 contain 优化布局性能 */
.container {
    contain: layout style;
}

/* 性能优化：减少重绘区域 */
.header {
    contain: strict;
}

/* 性能优化：GPU加速 */
.nav-card,
.category-btn,
.sort-btn {
    backface-visibility: hidden;
    perspective: 1000px;
}

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #475569;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] {
    --bg-primary: #f7fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: 60px 0 40px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInDown 0.8s ease;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease;
}

/* 搜索框样式 */
.search-container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    animation: fadeInUp 1s ease;
}

.search-box {
    width: 100%;
    padding: 18px 60px 18px 25px;
    font-size: 1.1rem;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: 50px;
    color: var(--text-primary);
    outline: none;
    transition: all 0.3s ease;
}

.search-box:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.search-icon {
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: var(--text-secondary);
    pointer-events: none;
}

/* 统计信息 */
.stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    animation: fadeInUp 1.4s ease;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 分类导航 */
.category-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin: 30px 0;
    animation: fadeInUp 1.2s ease;
}

.category-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 25px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    text-decoration: none;
    display: inline-block;
}

.category-btn:hover,
.category-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* 排序栏 */
.sort-bar {
    display: flex;
    justify-content: center;
    gap: 15px;
    align-items: center;
    margin: 20px 0;
    flex-wrap: wrap;
    color: var(--text-secondary);
}

.sort-btn {
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 15px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    text-decoration: none;
}

.sort-btn:hover,
.sort-btn.active {
    background: var(--accent);
    border-color: var(--accent);
}

/* 主内容区域 */
main {
    padding: 40px 0;
    flex: 1; /* 确保main占满剩余空间，将footer推到底部 */
}

.category-section {
    margin-bottom: 50px;
    animation: fadeInUp 0.6s ease;
}

.category-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    border-radius: 2px;
}

/* 网格布局 - 四栏布局 */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* 响应式调整 - 中等屏幕三栏 */
@media (max-width: 1200px) {
    .nav-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 响应式调整 - 平板两栏 */
@media (max-width: 900px) {
    .nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 卡片样式 */
.nav-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    display: block;
    text-decoration: none;
    color: inherit;
    will-change: transform;
}

.nav-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #a855f7);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}

.nav-card:hover::before {
    transform: scaleX(1);
}

.content-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    position: relative;
    overflow: hidden;
    color: inherit;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    will-change: transform;
}

.content-card::before {
    display: none;
}

.content-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 12px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-url {
    color: var(--accent);
    font-size: 0.85rem;
    text-decoration: none;
    word-break: break-all;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-stats {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-left: 10px;
}

/* 底部 */
footer {
    background: var(--bg-secondary);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: 60px;
    flex-shrink: 0; /* 防止footer被压缩 */
}

footer .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    text-align: left;
}

footer .footer-main {
    text-align: left;
}

footer .footer-links {
    text-align: right;
    padding-top: 60px;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

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

.footer-team p {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.footer-team strong {
    color: var(--text-primary);
    margin-right: 8px;
}

@media (max-width: 768px) {
    footer .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    footer .footer-main,
    footer .footer-links {
        text-align: center;
    }
    
    footer .footer-links {
        padding-top: 20px;
    }
}

/* 响应式 */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .search-box {
        padding: 15px 50px 15px 20px;
        font-size: 1rem;
    }

    .category-nav {
        gap: 8px;
    }

    .category-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .nav-grid {
        grid-template-columns: repeat(2, 1fr); /* 移动端保持两栏 */
    }

    .stats {
        gap: 20px;
    }

    .stat-number {
        font-size: 1.5rem;
    }
}

/* 动画 - 使用 transform 和 opacity 优化性能 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 图片懒加载样式 */
img[data-src] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[data-src]:not([data-src=""]) {
    background: var(--bg-card);
}

img:not([data-src]) {
    opacity: 1;
}

/* 主题切换按钮 */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    cursor: pointer;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
}

.theme-toggle:hover {
    background: var(--accent);
    transform: rotate(180deg);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 1.5rem;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
    color: white;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.back-to-top.show {
    display: flex;
}

/* 无结果提示 */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

/* 表单样式 */
.form-container {
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn {
    padding: 12px 24px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* 表格样式 */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
}

table th,
table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

table th {
    background: var(--bg-card);
    font-weight: 600;
    color: var(--text-primary);
}

table tr:hover {
    background: var(--bg-card);
}

/* 提示信息 */
.alert {
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 20px;
}

/* 友情链接区域 - 新版样式 */
.friend-links-section-full {
    padding: 60px 0 80px 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-top: 1px solid var(--border);
}

.friend-links-section-full .section-header {
    text-align: center;
    margin-bottom: 40px;
}

.friend-links-section-full .section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.friend-links-section-full .section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.friend-links-section-full .friend-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.friend-link-card-v2 {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.friend-link-card-v2::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.friend-link-card-v2:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -10px rgba(99, 102, 241, 0.3);
}

.friend-link-card-v2:hover::before {
    opacity: 1;
}

.friend-link-card-v2 .friend-link-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent) 0%, #a855f7 100%);
    border-radius: 14px;
    flex-shrink: 0;
    font-size: 24px;
    position: relative;
    z-index: 1;
}

.friend-link-card-v2 .friend-link-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 14px;
}

.friend-link-card-v2 .friend-link-content {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.friend-link-card-v2 .friend-link-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 6px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.3s ease;
}

.friend-link-card-v2:hover .friend-link-title {
    color: var(--accent);
}

.friend-link-card-v2 .friend-link-desc-v2 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.3s ease;
}

.friend-link-card-v2:hover .friend-link-desc-v2 {
    color: var(--text-primary);
}

.friend-link-card-v2 .friend-link-arrow {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1rem;
    transition: all 0.3s ease;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.friend-link-card-v2:hover .friend-link-arrow {
    background: var(--accent);
    color: white;
    transform: translateX(4px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .friend-links-section-full {
        padding: 40px 0 60px 0;
    }

    .friend-links-section-full .section-title {
        font-size: 1.5rem;
    }

    .friend-links-section-full .friend-links-grid {
        grid-template-columns: 1fr;
    }

    .friend-link-card-v2 {
        padding: 16px;
    }

    .friend-link-card-v2 .friend-link-icon {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
}

.alert-success {
    background: rgba(34, 197, 94, 0.2);
    border: 1px solid #22c55e;
    color: #22c55e;
}

.alert-error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid #ef4444;
    color: #ef4444;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.pagination a,
.pagination span {
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
}

.pagination a:hover,
.pagination .active {
    background: var(--accent);
    border-color: var(--accent);
}