/* ===== 基础变量定义 ===== */
:root {
    --primary-color: #409EFF;
    --primary-color-hover: #66b1ff;
    --primary-gradient: linear-gradient(45deg, #409EFF 0%, #79bbff 50%, #409EFF 100%);
    --bg-color: #f0f2f5;
    --card-bg-color: #ffffff;
    --text-primary: #303133;
    --text-regular: #606266;
    --text-secondary: #909399;
    --border-color-lighter: #ebeef5;
    --border-color-base: #dcdfe6;
    --font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
    --border-radius: 8px;
    --box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.05);
    --box-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* ===== 重置与基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 容器限制内容最大宽度，居中对齐 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 头部导航 ===== */
.site-header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color-lighter);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    /* 渐变边框效果（类似主站） */
    padding: 2px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--primary-gradient);
    background-size: 200% auto;
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: 0.5px;
}

.main-nav ul {
    display: flex;
    gap: 8px;
}

.main-nav a {
    padding: 8px 16px;
    color: var(--text-regular);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.main-nav a:hover {
    color: var(--primary-color);
    background-color: var(--bg-color);
}

.main-nav a.active {
    color: var(--primary-color);
    background-color: var(--bg-color);
}

/* ===== 博客主视觉 (Hero Section) ===== */
.hero-section {
    background-color: #ffffff;
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color-lighter);
}

.hero-title {
    font-size: 36px;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-regular);
    max-width: 800px;
    margin: 0 auto;
}

/* ===== 博客列表区 ===== */
.main-content {
    padding: 40px 24px 60px;
}

.section-title-wrapper {
    margin-bottom: 32px;
    text-align: left;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    position: relative;
    padding-left: 12px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 15px;
}

.blog-grid {
    display: grid;
    /* 响应式网格布局 */
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* 博客卡片设计 */
.blog-card {
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.blog-card-link {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.blog-cover {
    height: 180px;
    background-position: center;
    background-size: cover;
    background-color: var(--border-color-lighter); /* 回退颜色 */
    transition: transform 0.5s ease;
}

/* 鼠标悬停时放大一点图片特效 */
.blog-card:hover .blog-cover {
    transform: scale(1.05);
}

.blog-info {
    padding: 20px;
    flex: 1; /* 让info区域撑开高度 */
    display: flex;
    flex-direction: column;
    background-color: #fff;
    z-index: 2; /* 盖住图片放大溢出 */
}

.blog-category {
    align-self: flex-start;
    font-size: 12px;
    color: var(--primary-color);
    background-color: rgba(64, 158, 255, 0.1);
    padding: 4px 10px;
    border-radius: 12px;
    margin-bottom: 12px;
    font-weight: 500;
}

.blog-title {
    font-size: 18px;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2; /* 限制2行 */
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-weight: 600;
}

.blog-excerpt {
    font-size: 14px;
    color: var(--text-regular);
    line-height: 1.6;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3; /* 限制3行 */
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color-lighter);
}

/* ===== 分页 ===== */
.pagination {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    gap: 8px;
}

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 10px;
    background-color: #fff;
    border: 1px solid var(--border-color-base);
    color: var(--text-regular);
    border-radius: 4px;
    font-size: 14px;
    transition: var(--transition);
}

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

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

/* ===== 底部 Footer ===== */
.site-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color-lighter);
    padding: 24px 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-regular);
    font-size: 14px;
}

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

.divider {
    color: var(--border-color-base);
}

.copyright {
    color: var(--text-secondary);
    font-size: 13px;
}

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

.author-link:hover {
    text-decoration: underline;
}

/* ===== 博客文章页样式 ===== */
.post-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.post-article {
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--box-shadow);
}

.post-header {
    margin-bottom: 30px;
    text-align: center;
}

.post-meta-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.post-category {
    font-size: 13px;
    color: var(--primary-color);
    background-color: rgba(64, 158, 255, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
}

.post-date {
    font-size: 14px;
    color: var(--text-secondary);
}

.post-title {
    font-size: 32px;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 20px;
    font-weight: 700;
}

.post-meta-bottom {
    font-size: 14px;
    color: var(--text-secondary);
}

.post-cover {
    margin: 0 -40px 40px;
}

.cover-img {
    width: 100%;
    height: auto;
    max-height: 480px;
    object-fit: cover;
    display: block;
}

.post-content {
    font-size: 16px;
    color: var(--text-regular);
    line-height: 1.8;
}

.post-content h2 {
    font-size: 24px;
    color: var(--text-primary);
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color-lighter);
}

.post-content h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin: 30px 0 16px;
}

.post-content p {
    margin-bottom: 20px;
}

.post-content ul, .post-content ol {
    margin-bottom: 20px;
    padding-left: 24px;
}

.post-content li {
    margin-bottom: 8px;
}

.post-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.post-content blockquote {
    margin: 24px 0;
    padding: 16px 24px;
    background-color: rgba(64, 158, 255, 0.05);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 8px 8px 0;
    color: var(--text-regular);
}

.post-content blockquote p {
    margin-bottom: 0;
}

.post-content a {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 4px;
}

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

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 24px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.cta-box {
    margin-top: 60px;
    padding: 40px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
    text-align: center;
    color: #fff;
    box-shadow: 0 8px 24px rgba(64, 158, 255, 0.3);
}

.cta-box h3 {
    color: #fff;
    margin-top: 0;
    border: none;
    font-size: 24px;
}

.cta-box p {
    margin-bottom: 24px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none !important;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #f0f2f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ===== 悬浮固定推广按钮 ===== */
.fixed-cta-wrapper {
    position: fixed;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
}

.fixed-cta-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--card-bg-color);
    color: var(--primary-color);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color-lighter);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    text-decoration: none;
    writing-mode: vertical-lr;
    letter-spacing: 4px;
}

.fixed-cta-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(64, 158, 255, 0.2);
    border-color: var(--primary-color-light-5);
    color: var(--primary-color-hover);
}

.fixed-cta-icon {
    writing-mode: horizontal-tb;
    width: 24px;
    height: 24px;
    margin-bottom: 8px;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
    .post-container {
        padding: 20px 16px 60px;
    }

    .post-article {
        padding: 24px;
        border-radius: 12px;
    }

    .post-title {
        font-size: 24px;
    }

    .post-cover {
        margin: 0 -24px 24px;
    }

    .cta-box {
        padding: 30px 20px;
    }

    .fixed-cta-wrapper {
        top: auto;
        bottom: 24px;
        right: 16px;
        transform: none;
    }

    .fixed-cta-btn {
        flex-direction: row;
        writing-mode: horizontal-tb;
        padding: 12px 20px;
        border-radius: 30px;
        letter-spacing: normal;
        background: var(--primary-gradient);
        color: #fff;
    }

    .fixed-cta-btn:hover {
        transform: translateY(-2px);
        color: #fff;
    }

    .fixed-cta-icon {
        margin-bottom: 0;
        margin-right: 6px;
    }
    
    .header-container {
        flex-direction: column;
        height: auto;
        padding: 16px;
        gap: 16px;
    }

    .main-nav {
        width: 100%;
        overflow-x: auto;
    }

    .main-nav ul {
        width: max-content;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

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