/* 青金石蓝暗黑主题 */
:root {
    --primary: #1a237e;  /* 青金石蓝 */
    --primary-light: #534bae;
    --primary-dark: #000051;
    --secondary: #5c6bc0;
    --dark-bg: #121212;
    --dark-surface: #1e1e1e;
    --dark-text: #e0e0e0;
    --dark-muted: #9e9e9e;
    --accent: #ffab00;
    --success: #66bb6a;
    --error: #ef5350;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--dark-bg);
    color: var(--dark-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部 */
.header {
    background-color: var(--dark-surface);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--dark-text);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: rgba(92, 107, 192, 0.2);
    color: var(--secondary);
}

/* 主要内容 */
.main {
    flex: 1;
    padding: 2rem 0;
}

.section {
    background-color: var(--dark-surface);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary);
    position: relative;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
}

/* 卡片布局 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: rgba(30, 30, 30, 0.8);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
}

.card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--dark-muted);
    margin-top: 1rem;
}

/* 文章详情 */
.article-header {
    text-align: center;
    margin-bottom: 2rem;
}

.article-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    color: var(--dark-muted);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.article-img {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.article-content {
    line-height: 1.8;
}

.article-content p {
    margin-bottom: 1.5rem;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.pagination-link {
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius);
    background-color: rgba(26, 35, 126, 0.3);
    border: 1px solid var(--primary);
    transition: all 0.3s ease;
}

.pagination-link:hover {
    background-color: var(--primary);
    color: white;
}

/* 友情链接 */
.friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.friend-link {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    background-color: rgba(92, 107, 192, 0.1);
    border: 1px solid var(--secondary);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

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

/* 页脚 */
.footer {
    background-color: var(--dark-surface);
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.copyright {
    color: var(--dark-muted);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 1.5rem;
    }
}