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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #555;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* 头部导航 */
header {
    background: rgba(0, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #667eea;
}

/* 主要内容区 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 2rem 2rem;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
}

/* 阳光 */
.article-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.article-card h2 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.article-meta {
    color: #999;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-excerpt {
    color: #666;
    line-height: 1.8;
}

.read-more {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.5rem 1.5rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: transform 0.3s;
}

.read-more:hover {
    transform: scale(1.05);
}

/* 侧边栏 */
.sidebar {
    position: sticky;
    top: 100px;
}

.sidebar-card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.sidebar-card h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.5rem;
}

.profile-img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.profile-name {
    text-align: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.profile-bio {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

.category-list {
    list-style: none;
}

.category-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

.category-list li:last-child {
    border-bottom: none;
}

.category-list a {
    text-decoration: none;
    color: #666;
    display: flex;
    justify-content: space-between;
}

.category-list a:hover {
    color: #667eea;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.3rem 0.8rem;
    background: linear-gradient(135deg, #667eea20, #764ba220);
    color: #667eea;
    border-radius: 15px;
    font-size: 0.85rem;
    text-decoration: none;
    transition: all 0.3s;
}

.tag:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

/* 页脚 */
footer {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.social-links a {
    font-size: 1.5rem;
    text-decoration: none;
    transition: transform 0.3s;
}

.social-links a:hover {
    transform: scale(1.2);
}

.copyright {
    color: #999;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
    
    .sidebar {
        position: static;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-card {
    animation: fadeInUp 0.6s ease-out;
}

.article-card:nth-child(2) {
    animation-delay: 0.1s;
}

.article-card:nth-child(3) {
    animation-delay: 0.2s;
}