/* ==================== 基础样式 ==================== */
:root {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --text-color: #333;
    --text-light: #666;
    --border-color: #e0e0e0;
    --bg-color: #f5f5f5;
    --card-bg: #fff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

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

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

a:hover {
    color: var(--primary-hover);
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 35px;
    width: auto;
}

.site-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: normal;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s;
}

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

/* ==================== 主内容 ==================== */
.main-content {
    padding: 30px 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 30px;
}

.content-area {
    min-width: 0;
}

/* ==================== 文章卡片 ==================== */
.page-header {
    margin-bottom: 25px;
}

.page-header h1 {
    font-size: 1.8rem;
    color: var(--text-color);
}

.article-card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-2px);
}

.article-cover {
    width: 200px;
    flex-shrink: 0;
}

.article-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-body {
    padding: 20px;
    flex: 1;
}

.article-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.article-title a {
    color: var(--text-color);
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 10px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.article-meta .category {
    color: var(--primary-color);
}

.article-meta .author {
    display: flex;
    align-items: center;
    gap: 5px;
}

.author-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
}

.author-avatar-lg {
    width: 60px;
    height: 60px;
    border-radius: 50%;
}

.article-summary {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    color: var(--text-light);
}

.author-card {
    display: flex;
    gap: 20px;
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin: 30px 0;
}

.author-info h4 {
    margin-bottom: 5px;
}

.author-info p {
    color: var(--text-light);
    margin-bottom: 10px;
}

.references-section, .attachments-section {
    margin: 30px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}

.references-section h3, .attachments-section h3 {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.references-section ul, .attachments-section ul {
    list-style: none;
}

.references-section li, .attachments-section li {
    padding: 8px 0;
    border-bottom: 1px solid #e0e0e0;
}

.ref-desc, .att-desc {
    color: var(--text-light);
    font-size: 0.9em;
    margin-left: 10px;
}

.filesize {
    color: var(--text-light);
    font-size: 0.85em;
    margin-left: 10px;
}

.article-summary {
    color: var(--text-light);
    margin-bottom: 15px;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* ==================== 文章详情 ==================== */
.article-detail {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 40px;
    box-shadow: var(--shadow);
}

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

.article-header .article-title {
    font-size: 2rem;
    margin-bottom: 15px;
}

.article-header .article-meta {
    margin-bottom: 15px;
}

.article-cover {
    margin-bottom: 30px;
    border-radius: 8px;
    overflow: hidden;
}

.article-cover img {
    width: 100%;
    display: block;
}

.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-content h1, .article-content h2, .article-content h3 {
    margin: 1.5em 0 0.8em;
}

.article-content p {
    margin-bottom: 1em;
}

.article-content pre {
    background: #f4f4f4;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

.article-content code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Consolas', monospace;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.sidebar-section {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.sidebar-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.search-form {
    display: flex;
    gap: 5px;
}

.search-form input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.search-form button {
    padding: 8px 12px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.recent-list, .hot-list {
    list-style: none;
}

.recent-list li, .hot-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.recent-list li:last-child, .hot-list li:last-child {
    border-bottom: none;
}

.hot-list a {
    display: flex;
    align-items: center;
    gap: 10px;
}

.rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    font-size: 0.8rem;
}

/* ==================== 标签 ==================== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 15px;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.tag:hover {
    opacity: 0.8;
    color: #fff;
}

.tag.active {
    background: var(--tag-color, var(--primary-color));
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 30px;
}

.page-link {
    display: inline-block;
    padding: 8px 15px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
}

.page-link:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.page-link.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.page-link.ellipsis {
    border: none;
}

/* ==================== 按钮 ==================== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    color: #fff;
}

.btn-secondary {
    background: var(--secondary-color);
    color: #fff;
}

.btn-secondary:hover {
    opacity: 0.9;
    color: #fff;
}

.btn-danger {
    background: var(--danger-color);
    color: #fff;
}

.btn-danger:hover {
    opacity: 0.9;
    color: #fff;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.85rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ==================== 提示框 ==================== */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-success { background: #d4edda; color: #155724; }
.alert-danger { background: #f8d7da; color: #721c24; }
.alert-warning { background: #fff3cd; color: #856404; }
.alert-info { background: #d1ecf1; color: #0c5460; }

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.empty-state p {
    color: var(--text-light);
    margin-bottom: 20px;
}

/* ==================== 错误页面 ==================== */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

.error-page h1 {
    font-size: 6rem;
    color: var(--primary-color);
}

.error-page p {
    font-size: 1.5rem;
    margin: 20px 0 30px;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--card-bg);
    padding: 0;
    margin-top: 50px;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    height: 150px;
}

.footer-main {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 15px 20px;
}

.footer-main p {
    margin: 5px 0;
}

.footer-main .copyright {
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-main .technology {
    color: var(--text-light);
    font-size: 0.85rem;
}

.contact-links {
    margin-top: 15px;
    display: flex;
    gap: 20px;
}

.contact-links a {
    color: var(--text-light);
    font-size: 0.9rem;
}

.contact-links a:hover {
    color: var(--primary-color);
}

.footer-promo {
    display: flex;
    gap: 5px;
    height: 150px;
    align-items: stretch;
}

.promo-item {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 100px;
    height: 150px;
}

.promo-link {
    position: relative;
    display: block;
    height: 150px;
    overflow: hidden;
}

.promo-link img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s;
}

.promo-link:hover img {
    transform: scale(1.02);
}

.promo-title-overlay {
    display: none;
}

/* ==================== 响应式 ==================== */
@media (max-width: 992px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .article-card {
        flex-direction: column;
    }
    
    .article-cover {
        width: 100%;
        height: 200px;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
    
    .article-detail {
        padding: 20px;
    }
}