/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --max-width: 1200px;
}

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-light);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #1d4ed8;
}

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

/* 头部样式 */
.site-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
}

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

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

.site-nav a {
    color: var(--text-light);
    font-weight: 500;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--primary-color);
}

/* 主内容区域 */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* 首页样式 */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--radius);
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.25rem;
    opacity: 0.9;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

/* 分类网格 */
.categories-section {
    margin-bottom: 3rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.category-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.category-card-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.category-card-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.category-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-light);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 分类页面 */
.category-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.category-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.category-description {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 内容列表 */
.latest-section {
    margin-bottom: 3rem;
}

.content-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.content-item {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s;
}

.content-item:hover {
    box-shadow: var(--shadow-lg);
}

.content-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.content-summary {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.content-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.content-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.content-category {
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 4px;
    font-size: 0.85rem;
}

.content-date {
    color: var(--text-light);
}

.no-content {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
    font-size: 1.1rem;
}

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

.pagination-link {
    padding: 0.5rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: background 0.2s;
}

.pagination-link:hover {
    background: var(--bg-light);
}

.pagination-info {
    color: var(--text-light);
}

/* 内容详情页 */
.content-detail {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.content-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.content-detail .content-title {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.content-updated {
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border-color);
}

.content-cover {
    margin-bottom: 2rem;
}

.content-cover img {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
}

.content-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.content-body h2 {
    font-size: 1.75rem;
    margin: 2rem 0 1rem;
}

.content-body h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 0.75rem;
}

.content-body p {
    margin-bottom: 1rem;
}

.content-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 1rem 0;
}

.content-body ul,
.content-body ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-body blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-light);
    font-style: italic;
}

.content-body code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.content-body pre {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1rem 0;
}

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

.content-footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.back-link {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border-radius: var(--radius);
    transition: background 0.2s;
}

.back-link:hover {
    background: var(--border-color);
}

/* 搜索页面 */
.search-page {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.page-title {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.search-form {
    margin-bottom: 2rem;
}

.search-input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-button {
    padding: 0.75rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

.search-button:hover {
    background: #1d4ed8;
}

.search-filters {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.filter-label {
    font-weight: 500;
    min-width: 100px;
}

.filter-select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.95rem;
}

.tags-filter {
    flex-direction: column;
    align-items: flex-start;
}

.tags-filter-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.tag-filter-group {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.tag-filter-label {
    font-weight: 500;
    min-width: 80px;
    padding-top: 0.25rem;
}

.tag-filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag-filter-option {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
}

.tag-filter-option input[type="checkbox"] {
    cursor: pointer;
}

.search-results {
    min-height: 200px;
}

.search-hint {
    text-align: center;
    color: var(--text-light);
    padding: 3rem;
}

.search-result-count {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.loading-indicator {
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
}

.load-more-container {
    text-align: center;
    margin-top: 2rem;
}

.load-more-button {
    padding: 0.75rem 2rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.2s;
}

.load-more-button:hover {
    background: var(--border-color);
}

/* 页脚 */
.site-footer {
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
    color: var(--text-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

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

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

    .content-detail {
        padding: 1.5rem;
    }

    .content-detail .content-title {
        font-size: 1.75rem;
    }

    .search-input-group {
        flex-direction: column;
    }

    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }

    .tag-filter-group {
        flex-direction: column;
    }
}