/* ========================================
   资源导航网站 - 主样式文件
   ======================================== */

/* CSS变量 - 主题配置 */
:root {
    /* 主色调 */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    
    /* 辅助色 */
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* 中性色 */
    --bg-color: #f8fafc;
    --bg-secondary: #ffffff;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 间距 */
    --header-height: 70px;
    --container-width: 1280px;
}

/* 暗色主题 */
[data-theme="dark"] {
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
}

/* 基础重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select {
    font-family: inherit;
    font-size: inherit;
}

/* 容器 */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ========================================
   头部导航
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.9);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: var(--primary-light);
}

.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.25rem;
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-box input {
    width: 200px;
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-color);
    outline: none;
}

.search-box button {
    padding: 0.5rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.search-box button:hover {
    background: var(--primary-hover);
}

.theme-toggle,
.mobile-menu-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.theme-toggle:hover,
.mobile-menu-btn:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
}

/* ========================================
   Hero区域
   ======================================== */
.hero {
    position: relative;
    padding: calc(var(--header-height) + 4rem) 0 4rem;
    background: linear-gradient(135deg, var(--primary-light) 0%, #c7d2fe 50%, #ddd6fe 100%);
    overflow: hidden;
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #3730a3 100%);
}

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

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-search {
    max-width: 600px;
    margin: 0 auto;
}

.search-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 0.5rem;
    box-shadow: var(--shadow-xl);
}

.search-wrapper i {
    padding: 0 1rem;
    color: var(--text-muted);
    font-size: 1.25rem;
}

.search-wrapper input {
    flex: 1;
    padding: 1rem 0;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-color);
    outline: none;
}

.search-wrapper button {
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.search-wrapper button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.hot-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.hot-tags span {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.hot-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.hot-tag:hover {
    background: var(--primary-color);
    color: white;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-color), #fb923c);
    bottom: -50px;
    left: 10%;
    animation-delay: 2s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--success-color), #34d399);
    top: 50%;
    left: -50px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

/* ========================================
   分类标签
   ======================================== */
.categories-section {
    padding: calc(var(--header-height) + 2rem) 0 2rem;
    background: var(--bg-color);
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.category-tabs {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.5rem 0;
    scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.category-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.category-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.category-tab i {
    font-size: 1.125rem;
}

/* ========================================
   网站列表
   ======================================== */
.sites-section {
    padding: 3rem 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title i {
    color: var(--primary-color);
}

.sort-select {
    padding: 0.5rem 2rem 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* 网站卡片 */
.site-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.site-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

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

.site-card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.site-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.site-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.site-info {
    flex: 1;
    min-width: 0;
}

.site-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.site-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.site-tag {
    padding: 0.125rem 0.5rem;
    background: var(--bg-color);
    color: var(--text-muted);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

.site-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.site-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.site-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.site-stats span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.visit-btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.visit-btn:hover {
    background: var(--primary-hover);
    transform: translateX(4px);
}

/* 加载更多 */
.load-more {
    text-align: center;
    margin-top: 3rem;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    color: var(--text-color);
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.load-more-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.load-more-btn i {
    transition: transform var(--transition-normal);
}

.load-more-btn:hover i {
    transform: rotate(180deg);
}

.load-more-btn.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   最新收录
   ======================================== */
.latest-section {
    padding: 3rem 0;
    background: var(--bg-secondary);
}

.latest-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.latest-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.latest-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.latest-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary-color);
    font-weight: 700;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.latest-info {
    flex: 1;
    min-width: 0;
}

.latest-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.latest-category {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.view-all {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--primary-color);
    font-weight: 500;
}

.view-all:hover {
    text-decoration: underline;
}

/* ========================================
   统计信息
   ======================================== */
.stats-section {
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-light) 0%, #ddd6fe 100%);
}

[data-theme="dark"] .stats-section {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 1.5rem;
    border-radius: var(--radius-lg);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 0.25rem 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-bottom p {
    margin: 0.25rem 0;
}

/* ========================================
   返回顶部
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    font-size: 1.25rem;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-hover);
    transform: translateY(-4px);
}

/* ========================================
   搜索弹窗
   ======================================== */
.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 5rem 1rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 2000;
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-content {
    width: 100%;
    max-width: 600px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
}

.search-modal.active .search-modal-content {
    transform: translateY(0);
}

.search-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.search-modal-header h3 {
    font-weight: 600;
}

.close-modal {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: var(--bg-color);
    color: var(--text-color);
}

.search-modal-body {
    max-height: 60vh;
    overflow-y: auto;
    padding: 1rem;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--radius-lg);
    transition: background var(--transition-fast);
}

.search-result-item:hover {
    background: var(--bg-color);
}

/* ========================================
   提示消息
   ======================================== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: var(--text-color);
    color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 3000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .search-box {
        display: none;
    }
    
    .hero {
        padding: calc(var(--header-height) + 2rem) 0 2rem;
    }
    
    .search-wrapper {
        flex-direction: column;
        padding: 1rem;
    }
    
    .search-wrapper i {
        display: none;
    }
    
    .search-wrapper input {
        width: 100%;
        text-align: center;
    }
    
    .search-wrapper button {
        width: 100%;
        margin-top: 1rem;
    }
    
    .categories-section {
        position: relative;
        top: 0;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .sites-grid {
        grid-template-columns: 1fr;
    }
    
    .latest-list {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   加载动画
   ======================================== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-color) 25%, var(--border-color) 50%, var(--bg-color) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 无结果提示 */
.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.no-results i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.no-results p {
    font-size: 1.125rem;
}

/* ========================================
   关于我们
   ======================================== */
.about-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    margin-bottom: 1.5rem;
}

.about-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.about-contact {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.about-contact p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.about-contact i {
    color: var(--primary-color);
}

/* ========================================
   关于我们页面
   ======================================== */
.about-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0 4rem;
}

.about-page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.about-page-header h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.about-page-header h1 i {
    color: var(--primary-color);
}

.about-page-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.about-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.about-card h2 {
    font-size: 1.25rem;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary-light);
}

.about-card h2 i {
    color: var(--primary-color);
}

.about-text-content {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.contact-info {
    color: var(--text-secondary);
    line-height: 2;
}

.contact-info strong {
    color: var(--text-color);
}

.disclaimer {
    color: var(--text-secondary);
    line-height: 1.8;
}

.disclaimer p {
    margin-bottom: 0.75rem;
}

.header-actions .btn {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 0.875rem;
    transition: background var(--transition-fast);
}

.header-actions .btn:hover {
    background: var(--primary-hover);
}

@media (max-width: 768px) {
    .about-page-header h1 {
        font-size: 1.75rem;
    }
    
    .about-card {
        padding: 1.5rem;
    }
    
    .header-actions .btn {
        display: none;
    }
}