:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #10b981;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #94a3b8;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    --gradient: linear-gradient(135deg, #2563eb, #10b981);
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeIn 1s ease-in-out;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.logo i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-right: 0.8rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 1.2rem;
    color: var(--gray);
}

.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto 3rem;
    box-shadow: var(--card-shadow);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.search-box:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

#search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    font-size: 1rem;
    outline: none;
}

#search-btn {
    background: var(--gradient);
    color: white;
    border: none;
    padding: 0 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#search-btn:hover {
    background: var(--primary-dark);
}

.category {
    margin-bottom: 3rem;
    animation: slideUp 0.6s ease-out;
}

.category h2 {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid var(--gray);
    padding-bottom: 0.5rem;
}

.category h2 i {
    margin-right: 0.8rem;
    color: var(--primary);
}

.sites {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.site-card {
    display: flex;
    align-items: center;
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--dark);
    overflow: hidden;
    position: relative;
}

.site-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient);
    transition: all 0.3s ease;
}

.site-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

.site-card:hover::before {
    width: 8px;
}

.site-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light);
    border-radius: 12px;
    margin-right: 1rem;
    font-size: 1.5rem;
    color: var(--primary);
}

.site-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
    font-weight: 500;
}

.site-info p {
    font-size: 0.9rem;
    color: var(--gray);
}

footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--gray);
    padding-top: 2rem;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.social-links {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.social-link {
    margin: 0 0.5rem;
    color: var(--gray);
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--primary);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .sites {
        grid-template-columns: 1fr;
    }
    
    .site-card {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
}


/* 添加暗黑模式支持 */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s ease;
}

.dark-mode-toggle:hover {
    transform: rotate(15deg);
}

.dark-mode-toggle i {
    font-size: 1.2rem;
    color: var(--dark);
}

.dark-mode {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #10b981;
    --dark: #f8fafc;
    --light: #0f172a;
    --gray: #64748b;
    --card-bg: #1e293b;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.4);
}

/* 滚动动画 */
.category {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.category.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 卡片悬停特效 */
.site-card:hover .site-icon {
    transform: scale(1.1);
}

.site-icon {
    transition: transform 0.3s ease;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 添加顶部导航栏 */
.nav-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.nav-tab {
    padding: 0.5rem 1rem;
    margin: 0 0.5rem 0.5rem;
    background-color: var(--card-bg);
    color: var(--dark);
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

.nav-tab:hover {
    background: var(--gradient);
    color: white;
}

/* 添加返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--gradient);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 100;
    box-shadow: var(--card-shadow);
}

.back-to-top.visible {
    opacity: 1;
}

.back-to-top:hover {
    transform: translateY(-3px);
}




/* ICP备案样式 */
.icp-info {
    margin: 0.8rem 0;
    font-size: 0.85rem;
}

.icp-link {
    display: inline-flex;
    align-items: center;
    color: var(--gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.icp-link:hover {
    color: var(--primary);
}

.icp-icon {
    width: 14px;
    height: 14px;
    margin-right: 5px;
}


.icp-icon-fa {
    font-size: 0.85rem;
    margin-right: 5px;
    color: var(--gray);
}