/* ===== 文章页面专用样式 ===== */

/* 基础字体调整 */
:root {
    --article-font-size: 16px;
    --article-line-height: 1.8;
    --article-heading-1: 2rem;
    --article-heading-2: 1.5rem;
    --article-heading-3: 1.25rem;
    --article-heading-4: 1.125rem;
}

/* 文章容器 */
.article-container {
    padding: 2rem 0 4rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

/* ✅ 移动端容器占满全宽 */
@media (max-width: 1024px) {
    .article-container {
        max-width: 100%;
        padding: 1rem 0 2rem;
    }
}

/* 文章容器布局 */
.article-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    position: relative;
    transition: grid-template-columns 0.3s ease;
}

/* 桌面端目录收起时的布局调整 */
@media (min-width: 1025px) {
    .article-layout:has(.article-toc.collapsed) {
        grid-template-columns: 0 1fr;
        gap: 0;
    }
    
    .article-layout:has(.article-toc.collapsed) .article-main {
        max-width: 100%;
        width: 100%;
    }
}

.article-main {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

/* 文章头部 */
.article-header {
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
}

.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.article-meta .category {
    color: var(--primary-color);
    font-weight: 500;
    background-color: rgba(var(--primary-color-rgb), 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

.article-meta .divider {
    opacity: 0.5;
}

.article-meta .difficulty {
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    background-color: rgba(76, 175, 80, 0.1);
    color: #4caf50;
}

.article-meta .difficulty.进阶 {
    background-color: rgba(255, 152, 0, 0.1);
    color: #ff9800;
}

.article-meta .difficulty.专家 {
    background-color: rgba(244, 67, 54, 0.1);
    color: #f44336;
}

.article-title {
    font-size: 2rem;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-summary {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-light);
    margin-bottom: 2rem;
    padding-left: 1rem;
    border-left: 3px solid var(--primary-color);
}

/* 作者卡片 */
.author-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 600;
    color: var(--text-color);
    font-size: 1rem;
}

.author-bio {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* 文章封面 */
.article-cover {
    margin: 2rem 0;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.article-cover img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.article-cover img:hover {
    transform: scale(1.02);
}

/* 文章目录 - 左侧固定 */
.article-toc {
    position: sticky;
    top: 100px;
    height: fit-content;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    z-index: 100;
    width: 280px;
    flex-shrink: 0;
    /* ✅ 性能优化：使用 will-change 提前告知浏览器 */
    will-change: width;
    /* ✅ 使用 transform 代替部分布局属性 */
    transform: translateZ(0);
}

/* 桌面端收起状态：保留展开按钮区域 */
@media (min-width: 1025px) {
    .article-toc.collapsed {
        width: 48px !important; /* 保留按钮宽度 */
        min-width: 48px !important;
        max-width: 48px !important;
        padding: 0 !important;
        margin: 0 !important;
        border: 1px solid var(--border-color) !important;
        overflow: hidden !important;
        cursor: pointer;
    }
    
    .article-toc.collapsed .toc-header {
        display: flex !important;
        align-items: center;
        justify-content: center;
        padding: 1rem 0 !important;
        border-bottom: none !important;
    }
    
    .article-toc.collapsed .toc-header h3 {
        display: none !important; /* 隐藏标题文字 */
    }
    
    
    .article-toc.collapsed .toc-content {
        display: none !important; /* 隐藏目录内容 */
    }
    
    /* 目录收起时，主内容区域扩展 */
    .article-layout:has(.article-toc.collapsed) {
        grid-template-columns: 48px 1fr; /* 第一列保留 48px */
        gap: 0;
        /* ✅ 优化 Grid 布局过渡 */
        transition: grid-template-columns 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .article-layout:has(.article-toc.collapsed) .article-main {
        max-width: calc(100% - 1rem);
        width: 100%;
    }
}

/* 目录标题 */
.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.toc-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
}

.toc-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.toc-toggle {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.25rem;
    /* ✅ 优化：使用更精确的 transition，只控制 transform */
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* ✅ GPU 加速 */
    will-change: transform;
    backface-visibility: hidden;
}

/* 确保 Font Awesome 图标继承父元素的过渡效果 */
.toc-toggle i {
    transition: inherit;
    /* ✅ GPU 加速 */
    will-change: transform;
    backface-visibility: hidden;
}

.toc-content {
    padding: 1rem 1.5rem;
    display: block;
    max-height: 400px;
    overflow-y: auto;
}

.toc-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-content li {
    margin-bottom: 0.5rem;
    position: relative;
}

.toc-content a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.25rem 0;
    display: block;
    transition: var(--transition);
    position: relative;
    padding-left: 1rem;
    line-height: 1.4;
}

.toc-content a:hover {
    color: var(--primary-color);
    padding-left: 1.25rem;
}

.toc-content a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.toc-content a:hover::before {
    opacity: 1;
}

/* 当前活动标题 */
.toc-content a.active {
    color: var(--primary-color);
    font-weight: 500;
    padding-left: 1.25rem;
}

.toc-content a.active::before {
    opacity: 1;
    background-color: var(--primary-color);
}

/* 嵌套目录 */
.toc-content ul ul {
    margin-left: 0.75rem;
    margin-top: 0.5rem;
    border-left: 1px solid var(--border-color);
    padding-left: 0.5rem;
}

/* 文章内容 */
.article-content {
    font-size: var(--article-font-size);
    line-height: var(--article-line-height);
    margin-bottom: 3rem;
    color: var(--text-color);
}

.article-content > * {
    margin-bottom: 1.5rem;
}

/* 文章正文主标题（来自文件名） */
.article-content .article-main-title {
    font-size: 2rem;
    line-height: 1.3;
    margin-top: 0;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-color);
    font-weight: 600;
    text-align: left; /* 改为左对齐 */
}

/* 标题样式 - 全部左对齐 */
.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    text-align: left;
    color: var(--text-color);
    font-weight: 600;
}

.article-content h1 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.article-content h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    position: relative;
    padding-left: 0.75rem;
}

.article-content h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    bottom: 0.5em;
    width: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.article-content h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.article-content h4 {
    font-size: 1.125rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.article-content h5 {
    font-size: 1rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.article-content h6 {
    font-size: 0.9375rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

/* 段落样式 - 左对齐 */
.article-content p {
    text-align: left;
    margin-bottom: 1.5rem;
}

/* 列表样式 - 左对齐 */
.article-content ul,
.article-content ol {
    text-align: left;
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.article-content li {
    text-align: left;
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

/* 嵌套列表 */
.article-content li > ul,
.article-content li > ol {
    margin-top: 0.5rem;
    margin-bottom: 0;
    padding-left: 1.5rem;
}

/* 引用块 - 左对齐 */
.article-content blockquote {
    text-align: left;
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-light);
    font-style: italic;
    background-color: rgba(74, 108, 247, 0.05);
    padding: 1rem 1.5rem;
    border-radius: 0 4px 4px 0;
}

/* 代码块样式 - 修复 */
.article-content pre {
    background-color: #1a1a1a;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.article-content pre code {
    background: none;
    color: #e0e0e0;
    padding: 0;
    border-radius: 0;
    font-size: 0.9375em;
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    display: block;
}

/* 行内代码 */
.article-content :not(pre) > code {
    background-color: #f0f0f0;
    color: #d63384;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'Courier New', Courier, monospace;
}

[data-theme="dark"] .article-content :not(pre) > code {
    background-color: #2d2d2d;
    color: #f78c6c;
}

/* 代码高亮主题 */
.hljs {
    color: #e0e0e0;
    background: #1a1a1a;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-link {
    color: #569cd6;
}

.hljs-function .hljs-keyword {
    color: #dcdcaa;
}

.hljs-number {
    color: #b5cea8;
}

.hljs-string {
    color: #ce9178;
}

.hljs-title,
.hljs-name,
.hljs-type,
.hljs-attribute,
.hljs-symbol,
.hljs-bullet,
.hljs-addition,
.hljs-variable,
.hljs-template-tag,
.hljs-template-variable {
    color: #4ec9b0;
}

.hljs-comment,
.hljs-quote,
.hljs-deletion,
.hljs-meta {
    color: #6a9955;
}

.hljs-emphasis {
    font-style: italic;
}

.hljs-strong {
    font-weight: bold;
}

/* 文章尾部 */
.article-footer {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

/* 标签 */
.article-tags {
    margin-bottom: 2rem;
}

.article-tags h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tags-list .tag {
    background-color: var(--bg-secondary);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

/* 元信息网格 */
.article-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.meta-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
}

.meta-card h4 {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.meta-card p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

/* 参考文献 */
.article-bibliography {
    margin-bottom: 3rem;
}

.article-bibliography h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-bibliography ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.article-bibliography li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9375rem;
}

.article-bibliography li:last-child {
    border-bottom: none;
}

/* 分享按钮 */
.article-share {
    margin-bottom: 3rem;
}

.article-share h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.share-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.25rem;
}

/* 复制链接按钮特殊样式 - 显示文字 */
.share-btn.copy-link {
    width: auto;
    padding: 0 1.5rem;
    border-radius: 2rem;
    gap: 0.5rem;
    font-size: 0.9375rem;
}

.share-btn.copy-link span {
    display: inline-block;
}

.share-btn.copy-link i {
    font-size: 1.125rem;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    animation: toastSlideIn 0.3s ease-out;
    max-width: 90%;
    text-align: center;
    font-size: 0.9375rem;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, 2rem);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

/* 导航按钮 */
.article-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.article-navigation .nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background-color: var(--bg-secondary);
    color: var(--text-color);
    border-radius: var(--radius);
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    flex: 1;
    min-width: 200px;
    justify-content: center;
    font-size: 0.9375rem;
}

.article-navigation .nav-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .article-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .article-toc {
        position: static;
        max-height: none;
        margin-bottom: 2rem;
        width: 100%;
    }
    
    /* ✅ 移动端主内容区占满全宽 */
    .article-main {
        max-width: 100%;
        width: 100%;
        padding: 0 1rem;
    }
    
    /* 移动端收起状态：上下收起 */
    .article-toc.collapsed .toc-content {
        display: none;
    }
    
    .article-toc.collapsed {
        margin-bottom: 1rem;
    }
    
    .toc-content {
        max-height: 300px;
    }
}

@media (max-width: 768px) {
    .article-title {
        font-size: 1.75rem;
    }
    
    .article-summary {
        font-size: 1rem;
    }
    
    .article-content {
        font-size: 0.9375rem;
    }
    
    /* ✅ 移动端内容区增加内边距 */
    .article-main {
        padding: 0 1rem;
    }
    
    .article-content h1 {
        font-size: 1.5rem;
    }
    
    .article-content h2 {
        font-size: 1.25rem;
    }
    
    .article-content h3 {
        font-size: 1.125rem;
    }
    
    .article-content h4 {
        font-size: 1rem;
    }
    
    .article-meta-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .article-navigation {
        flex-direction: column;
    }
    
    .article-navigation .nav-btn {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .article-title {
        font-size: 1.5rem;
    }
    
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .article-meta .divider {
        display: none;
    }
    
    .article-meta-grid {
        grid-template-columns: 1fr;
    }
    
    .toc-content {
        max-height: 200px;
    }
}