/* ========== 全局变量 ========== */
:root {
    --primary-color: #0366d6;
    --primary-dark: #0056b3;
    --text-color: #24292e;
    --text-light: #586069;
    --bg-color: #fafafa;
    --bg-white: #ffffff;
    --border-color: #eaecef;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.15);
}

* {
    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);
}

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

/* 头部导航 */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo h1 {
    font-size: 1.5rem;
}

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

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

.nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 1rem;
}

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

.user-info {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.github-link {
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.github-link:hover {
    color: var(--primary-color);
}

/* 分类标签栏 */
.category-bar {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 2rem;
    overflow-x: auto;
}

.category-list {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    gap: 1rem;
    list-style: none;
}

.category-tag {
    padding: 0.5rem 1.5rem;
    background-color: #f1f3f5;
    color: var(--text-light);
    text-decoration: none;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.category-tag:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 卡片网格 */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.post-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: block;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.card-image {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.card-content {
    padding: 1.2rem;
}

.card-category {
    display: inline-block;
    padding: 0.2rem 0.8rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 500;
    margin-bottom: 0.8rem;
}

.card-category.tutorial {
    background-color: #e3f2fd;
    color: #1976d2;
}

.card-category.app {
    background-color: #e8f5e9;
    color: #388e3c;
}

.card-category.other {
    background-color: #fff3e0;
    color: #f57c00;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    line-height: 1.4;
}

.card-desc {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    padding-top: 0.8rem;
}

/* 文章详情页 */
.article-container {
    max-width: 900px;
    margin: 2rem auto;
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

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

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

.article-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.5rem;
    margin: 1.5em 0 0.75em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
    font-size: 1.25rem;
    margin: 1.25em 0 0.5em;
}

.article-content p {
    margin-bottom: 1.2em;
}

.article-content ul, .article-content ol {
    margin: 1em 0 1em 2em;
}

.article-content code {
    background-color: #f6f8fa;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: monospace;
    font-size: 0.9em;
}

.article-content pre {
    background-color: #f6f8fa;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1em 0;
}

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

.article-content a:hover {
    text-decoration: underline;
}

/* 下载链接按钮 */
.download-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.download-btn.baidu {
    background-color: #2c6e9e;
    color: white;
}

.download-btn.quark {
    background-color: #1a8c3e;
    color: white;
}

.download-btn.github {
    background-color: #24292e;
    color: white;
}

.download-btn.qq {
    background-color: #12b7f5;
    color: white;
}

.download-btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

/* 评论区 */
.comments-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* 关于页面卡片 */
.about-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 3rem auto;
}

.about-card h1 {
    margin-bottom: 1rem;
}

.about-card h2 {
    margin: 1.5rem 0 0.5rem;
    font-size: 1.3rem;
}

.about-card ul {
    margin-left: 1.5rem;
}

.about-card .contact-info {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
}

/* 页脚 */
.footer {
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1.2rem;
        justify-content: center;
    }
    
    .nav-menu a {
        font-size: 0.9rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .article-container {
        padding: 1rem;
        margin: 1rem;
    }
    
    .article-title {
        font-size: 1.5rem;
    }
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0d1117;
        --bg-white: #161b22;
        --text-color: #c9d1d9;
        --text-light: #8b949e;
        --border-color: #30363d;
    }
    
    .card-category.tutorial {
        background-color: #1e3a5f;
        color: #90caf9;
    }
    
    .card-category.app {
        background-color: #1e4620;
        color: #a5d6a7;
    }
    
    .card-category.other {
        background-color: #4e3a1f;
        color: #ffb74d;
    }
    
    .category-tag {
        background-color: #2d333b;
        color: var(--text-light);
    }
    
    .article-content code,
    .article-content pre {
        background-color: #2d333b;
    }
    
    .about-card .contact-info {
        background-color: #2d333b;
    }
}