/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --text-color: #334155;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    background-color: #f1f5f9;
    line-height: 1.6;
}

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

/* 导航栏样式 */
.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    flex-direction: column;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.tagline {
    font-size: 0.85rem;
    color: #64748b;
    margin-top: 3px;
}

.nav-links {
    display: flex;
    gap: 25px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 6px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--primary-color);
    color: white;
}

.search-container {
    display: flex;
    align-items: center;
    gap: 0;
}

#searchInput {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px 0 0 6px;
    width: 250px;
    font-size: 1rem;
    transition: var(--transition);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

#searchBtn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    transition: var(--transition);
}

#searchBtn:hover {
    background-color: var(--secondary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
}

/* 快捷访问区域 */
.quick-access {
    padding: 40px 0;
    background-color: white;
    margin-bottom: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-top: 20px;
}

.quick-access h2 {
    margin-bottom: 25px;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

.quick-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: var(--light-color);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.quick-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.quick-item i {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.quick-item:nth-child(1) i { color: #4285f4; }
.quick-item:nth-child(2) i { color: #ff0000; }
.quick-item:nth-child(3) i { color: #333; }
.quick-item:nth-child(4) i { color: #10a37f; }
.quick-item:nth-child(5) i { color: #2319dc; }
.quick-item:nth-child(6) i { color: #0084ff; }

.quick-item span {
    font-weight: 600;
    font-size: 1.1rem;
}

/* 分类区域 */
.category-section {
    margin-bottom: 50px;
}

.category-header {
    margin-bottom: 30px;
}

.category-header h2 {
    font-size: 1.8rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.category-desc {
    color: #64748b;
    font-size: 1rem;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.site-card {
    background-color: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.site-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.site-header {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    background-color: var(--light-color);
}

.site-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    flex-shrink: 0;
}

.site-info h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.site-info p {
    color: #64748b;
    font-size: 0.9rem;
}

.site-desc {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
    line-height: 1.5;
}

.site-stats {
    padding: 10px 20px;
    background-color: #f8fafc;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #64748b;
}

.site-link {
    display: block;
    text-align: center;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.site-link:hover {
    background-color: var(--secondary-color);
}

/* 统计数据区域 */
.stats-section {
    background-color: white;
    padding: 50px 0;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 50px;
}

.stats-section h2 {
    text-align: center;
    margin-bottom: 40px;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
}

.stat-card {
    background-color: var(--light-color);
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.stat-card h3 {
    color: var(--dark-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-desc {
    color: #64748b;
    font-size: 0.95rem;
}

/* 页脚样式 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-section p {
    margin-bottom: 15px;
    color: #cbd5e1;
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: white;
    padding-left: 5px;
}

.social-icons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #334155;
    border-radius: 50%;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #475569;
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 10px;
}

/* 回到顶部按钮 */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    z-index: 100;
}

#backToTop:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .search-container {
        width: 100%;
        margin-top: 15px;
    }
    
    #searchInput {
        width: 100%;
    }
    
    .nav-container {
        flex-wrap: wrap;
    }
    
    .sites-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .quick-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .site-header {
        flex-direction: column;
        text-align: center;
    }
    
    .site-info h3 {
        font-size: 1.1rem;
    }
}