/**
 * blog.css - 博客页面专属样式
 * 注意：此样式表假设导航栏使用 position: fixed
 * 已通过 padding-top 解决内容重叠问题
 */

/* ===== 基础重置与全局设置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f8ff;
    color: #333;
    line-height: 1.6;
    /* 确保 body 从顶部开始，无额外间距 */
    padding-top: 0 !important;
    margin-top: 0 !important;
}

/* ===== 主容器 - 解决导航栏重叠问题的关键 ===== */
/* 使用 body .container 提高选择器特异性 */
body .container {
    max-width: 800px;
    margin: 0 auto;
    /* 关键：顶部内边距必须足够大以避开固定导航栏 */
    /* 7rem ≈ 112px，根据导航栏实际高度调整 */
    padding: 7rem 2rem 3rem;
    /* 确保容器在导航栏下方 */
    position: relative;
    z-index: 1;
}

/* ===== 博客内容卡片 ===== */
.blog-content {
    margin-top: 0;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 119, 255, 0.08);
    padding: 3rem;
    /* 确保卡片在容器内正确显示 */
    overflow: hidden;
}

/* ===== 文章标题区域 ===== */
.article-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 3px solid #e9f0fe;
}

.article-title {
    font-size: 2.2rem;
    color: #0077ff;
    margin-bottom: 1rem;
    line-height: 1.3;
    font-weight: 700;
}

.publish-date {
    background-color: #e9f5ff;
    color: #0077ff;
    padding: 0.5rem 1.5rem;
    border-radius: 25px;
    font-weight: 600;
    display: inline-block;
    font-size: 0.95rem;
}

/* ===== 文章正文样式 ===== */
.article-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #444;
}

.article-body p {
    margin-bottom: 1.2rem;
}

.article-body h2 {
    font-size: 1.8rem;
    color: #333;
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e9f0fe;
    font-weight: 600;
}

.article-body h3 {
    font-size: 1.4rem;
    color: #0077ff;
    margin: 1.5rem 0 0.8rem;
    font-weight: 600;
}

.article-body ul,
.article-body ol {
    margin-left: 2rem;
    margin-bottom: 1.2rem;
}

.article-body li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.article-body strong {
    color: #0077ff;
    font-weight: 600;
}

.article-body em {
    font-style: italic;
    color: #555;
}

.article-body code {
    background-color: #f0f5ff;
    color: #0077ff;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.95em;
}

.article-body pre {
    background-color: #f0f5ff;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
    overflow-x: auto;
    border-left: 4px solid #0077ff;
}

.article-body pre code {
    background-color: transparent;
    padding: 0;
    color: #333;
    font-size: 0.95rem;
    line-height: 1.5;
}

.article-body blockquote {
    border-left: 4px solid #0077ff;
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: #555;
    font-style: italic;
    background-color: #f9fbff;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    padding-right: 1rem;
    border-radius: 0 8px 8px 0;
}

.article-body a {
    color: #0077ff;
    text-decoration: none;
    transition: color 0.2s;
}

.article-body a:hover {
    color: #0055cc;
    text-decoration: underline;
}

/* ===== 文章导航按钮 ===== */
.article-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9f0fe;
}

.nav-button {
    color: #0077ff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    background-color: rgba(0, 119, 255, 0.1);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-button:hover {
    background-color: rgba(0, 119, 255, 0.2);
    transform: translateY(-1px);
}

/* ===== 博客页脚 ===== */
.blog-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9f0fe;
    color: #666;
    font-size: 0.9rem;
}

.blog-footer p {
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: #666;
    font-size: 1.2rem;
    transition: color 0.2s, transform 0.2s;
}

.social-links a:hover {
    color: #0077ff;
    transform: translateY(-2px);
}

/* ===== 响应式设计 - 解决不同设备上的重叠问题 ===== */

/* 平板设备 (768px及以下) */
@media (max-width: 768px) {
    body .container {
        /* 稍微减少顶部内边距，平板导航栏可能更紧凑 */
        padding: 6rem 1.5rem 2rem;
    }

    .blog-content {
        padding: 2rem;
        margin-top: 0;
    }

    .article-title {
        font-size: 1.8rem;
    }

    .article-header {
        padding-bottom: 1rem;
        margin-bottom: 1.5rem;
    }

    .article-navigation {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .nav-button {
        display: inline-block;
        width: 100%;
        text-align: center;
        box-sizing: border-box;
    }

    .article-body {
        font-size: 1.05rem;
    }

    .article-body h2 {
        font-size: 1.6rem;
    }

    .article-body h3 {
        font-size: 1.3rem;
    }
}

/* 手机设备 (480px及以下) */
@media (max-width: 480px) {
    body .container {
        /* 进一步减少顶部内边距，手机导航栏通常更薄 */
        padding: 5.5rem 1rem 2rem;
    }

    .blog-content {
        padding: 1.5rem;
        border-radius: 10px; /* 稍小的圆角适应小屏幕 */
    }

    .article-title {
        font-size: 1.6rem;
    }

    .publish-date {
        padding: 0.4rem 1.2rem;
        font-size: 0.9rem;
    }

    .article-body pre {
        padding: 1rem;
        font-size: 0.9rem;
    }

    .social-links {
        gap: 0.8rem;
    }

    .social-links a {
        font-size: 1.1rem;
    }
}

/* 大屏幕设备 (1200px及以上) */
@media (min-width: 1200px) {
    body .container {
        max-width: 850px; /* 稍宽一些，适应大屏幕 */
    }
}

/* ===== 辅助类与工具样式 ===== */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* 代码高亮增强 */
.code-block {
    position: relative;
    margin: 1.5rem 0;
}

.code-block::before {
    content: attr(data-language);
    position: absolute;
    top: 0;
    right: 0;
    background-color: #0077ff;
    color: white;
    padding: 0.2rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 0 0 0 5px;
    font-family: 'Segoe UI', sans-serif;
}

/* 图片响应式处理 */
.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
    display: block;
}

.img-caption {
    text-align: center;
    font-style: italic;
    color: #666;
    margin-top: -1rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* ===== 打印样式 ===== */
@media print {
    body .container {
        padding-top: 2rem !important;
        max-width: 100%;
    }

    .blog-content {
        box-shadow: none;
        border-radius: 0;
        padding: 0;
    }

    .nav-button,
    .social-links,
    .blog-footer {
        display: none;
    }
}