/* CSS 变量定义 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f8f9fa;
    --white: #fff;
    --border-color: #e1e4e8;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --container-width: 1200px;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: var(--transition);
}

.logo:hover {
    color: var(--secondary-color);
}

.nav-list {
    display: flex;
    gap: 30px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-color);
    padding: 8px 0;
    position: relative;
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--secondary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--white);
    color: var(--primary-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.3);
}

/* 主要内容区域 */
.main-content {
    padding: 40px 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
}

/* 文章列表区域 */
.posts-section {
    min-width: 0;
}

.section-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--secondary-color);
}

/* 文章卡片 */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.post-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.post-image {
    position: relative;
    height: 200px;
}

.post-thumbnail {
    width: 100%;
    height: 100%;
}

.post-category {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--secondary-color);
    color: var(--white);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.post-content {
    padding: 20px;
}

.post-meta {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 12px;
}

.post-title {
    font-size: 1.2rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.post-title a:hover {
    color: var(--secondary-color);
}

.post-excerpt {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    color: var(--secondary-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.read-more:hover {
    color: var(--primary-color);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
    padding: 20px 0;
}

.page-link {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    transition: var(--transition);
}

.page-link:hover,
.page-link.active {
    background: var(--secondary-color);
    color: var(--white);
    border-color: var(--secondary-color);
}

.page-link.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.page-ellipsis {
    display: flex;
    align-items: center;
    padding: 0 10px;
}

/* 侧边栏 */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar-widget {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
}

.widget-title {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

/* 关于我 */
.about-me {
    text-align: center;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--secondary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 auto 15px;
}

.about-me h4 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.about-me p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.social-link {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    transition: var(--transition);
}

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

/* 分类目录 */
.category-list li {
    border-bottom: 1px solid var(--border-color);
}

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

.category-list a {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    color: var(--text-color);
    transition: var(--transition);
}

.category-list a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.category-list span {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 6px 12px;
    background: var(--bg-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-color);
    transition: var(--transition);
}

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

/* 最新文章 */
.recent-posts li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.recent-posts li:last-child {
    border-bottom: none;
}

.recent-posts a {
    display: block;
    font-weight: 500;
    margin-bottom: 5px;
    transition: var(--transition);
}

.recent-posts a:hover {
    color: var(--secondary-color);
}

.recent-posts .post-date {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 50px 0 0;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    padding-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.8;
}

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

.footer-section ul a {
    opacity: 0.8;
    transition: var(--transition);
}

.footer-section ul a:hover {
    opacity: 1;
    color: var(--secondary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .sidebar-widget {
        flex: 1;
        min-width: 250px;
    }
}

@media (max-width: 768px) {
    .nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow);
    }

    .nav-list.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .posts-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        flex-direction: column;
    }

    .sidebar-widget {
        min-width: 100%;
    }
}

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

.post-card {
    animation: fadeIn 0.5s ease forwards;
}

.post-card:nth-child(1) { animation-delay: 0.1s; }
.post-card:nth-child(2) { animation-delay: 0.2s; }
.post-card:nth-child(3) { animation-delay: 0.3s; }
.post-card:nth-child(4) { animation-delay: 0.4s; }
.post-card:nth-child(5) { animation-delay: 0.5s; }
.post-card:nth-child(6) { animation-delay: 0.6s; }