:root {
    --bg-color: #f5f5f5;
    --text-color: #333333;
    --border-color: #e8e8e8;
    --card-bg: #ffffff;
    --card-header-bg: #fafafa;
    --link-color: #1890ff;
    --muted-color: #999999;
    --search-bg: #ffffff;
    --search-border: #e8e8e8;
    --scroll-btn-bg: rgba(42, 122, 226, 0.7);
    --scroll-btn-bg-hover: rgba(42, 122, 226, 1);
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --border-color: #333;
    --card-bg: #2a2a2a;
    --card-header-bg: #333;
    --link-color: #4a9eff;
    --muted-color: #999;
    --search-bg: #2a2a2a;
    --search-border: #333;
    --scroll-btn-bg: rgba(129, 182, 250, 0.7);
    --scroll-btn-bg-hover: rgb(129, 182, 250,1);
}

/* 禁用页面加载时的过渡效果，避免主题切换闪烁 */
html.page-loading,
html.page-loading *,
html.page-loading *::before,
html.page-loading *::after {
    transition: none !important;
    animation-duration: 0s !important;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 16px;
    line-height: 1.8;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background: var(--card-bg);
    margin-top: 20px;
    margin-bottom: 20px;
    transition: background-color 0.3s ease;
}

.header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    transition: border-color 0.3s ease;
}

.back-link {
    display: inline-block;
    background: var(--card-header-bg);
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--link-color);
    text-decoration: none;
    margin-bottom: 15px;
    font-size: 0.9em;
    transition: color 0.3s ease;
}

.back-link:hover {
    background: var(--border-color);
    color:var(--link-color);
    text-decoration: none;
}

.article-title {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}

.article-meta {
    color: var(--muted-color);
    font-size: 0.9em;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.article-meta .separator {
    color: var(--muted-color);
    opacity: 0.6;
    margin: 0 4px;
}

.article-meta span {
    white-space: nowrap;
}

.labels {
    margin-top: 10px;
}

.label {
    display: inline-block;
    background: var(--card-header-bg);
    color: var(--text-color);
    padding: 4px 8px;
    font-size: 0.8em;
    margin-right: 5px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.article-content {
    font-size: 1em;
    line-height: 1.6;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    color: var(--text-color);
    margin-top: 30px;
    margin-bottom: 15px;
}

.article-content h1 {
    font-size: 1.6em;
    font-weight: 700;
}

.article-content h2 {
    font-size: 1.4em;
    font-weight: 700;
}

.article-content h3 {
    font-size: 1.2em;
    font-weight: 700;
}

.article-content p {
    margin-bottom: 15px;
}

.article-content img {
    max-width: 100%;
    height: auto;
    margin: 15px 0;
}

.article-content pre {
    background: var(--card-header-bg);
    padding: 15px;
    overflow-x: auto;
    margin: 15px 0;
    transition: background-color 0.3s ease;
}

.article-content code {
    background: var(--card-header-bg);
    padding: 2px 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    transition: background-color 0.3s ease;
}

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

.article-content blockquote {
    border-left: 4px solid var(--link-color);
    margin: 15px 0;
    padding: 10px 20px;
    background: var(--card-header-bg);
    transition: background-color 0.3s ease;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.article-content th,
.article-content td {
    padding: 10px;
    text-align: left;
}

.article-content th {
    background: var(--card-header-bg);
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.article-content ul,
.article-content ol {
    margin: 15px 0;
    padding-left: 30px;
}

.article-content li {
    margin-bottom: 5px;
}

.footer {
    margin-top: 40px;
    padding-top: 20px;
    text-align: center;
    color: var(--muted-color);
    font-size: 0.9em;
    transition: color 0.3s ease;
}

.github-link {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* 响应式设计 */
@media (max-width: 767px) {
    .container {
        margin: 10px;
        padding: 15px;
    }
    
    .article-title {
        font-size: 1.5em;
    }
    
    .article-content {
        font-size: 0.9em;
    }
    
    .article-meta {
        font-size: 0.85em;
        gap: 6px;
    }
    
    .article-meta .separator {
        margin: 0 2px;
    }
}

/* 代码块复制按钮样式 */
.code-block-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--card-header-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 4px 8px;
    font-size: 0.8em;
    cursor: pointer;
    border-radius: 3px;
    opacity: 0.7;
    transition: all 0.3s ease;
    z-index: 10;
}

.copy-btn:hover {
    opacity: 1;
    background: var(--border-color);
}

.copy-btn.copied {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.article-content pre:hover .copy-btn {
    opacity: 1;
}

/* 有目录时，限制内容宽度以提高可读性 */
@media (min-width: 1024px) {
    .article-layout:has(.toc-sidebar) .article-content {
        max-width: 700px;
        margin: 0 auto;
    }
}

/* 滚动悬浮按钮样式 */
.scroll-buttons {
    position: fixed;
    right: -20px;
    bottom: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* 首页定位 - 基于 .container */
body.page-home .scroll-buttons {
    right: calc(50% - 400px - 60px); 
}

/* 无目录文章页定位 - 基于 .article-layout 但没有 .toc-sidebar */
body.page-article-no-toc .scroll-buttons {
    right: calc(50% - 400px - 30px); 
}

/* 有目录文章页定位 - 基于 .article-layout 且有 .toc-sidebar */
body.page-article-with-toc .scroll-buttons {
    right: calc(50% - 400px + 140px - 20px); /* 基于 容器：(800/2) + 目录 (280/2) + 20 */
}

.scroll-btn {
    width: 40px;
    height: 40px;
    border-radius: 2%;
    background: var(--scroll-btn-bg);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.scroll-btn:hover {
    background: var(--scroll-btn-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.scroll-btn.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-btn:active {
    transform: translateY(0);
}


/* 移动端适配 */
@media (max-width: 767px) {
    .scroll-buttons {
        right: 15px;
        bottom: 15px;
    }
    
    .scroll-btn {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
}

/* 中等屏幕适配 */
@media (max-width: 1023px) {
    .scroll-buttons {
        right: 20px;
        bottom: 20px;
    }
}

/* 主题切换按钮样式 */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    margin-left: 8px;
    vertical-align: middle;
}

.theme-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
    transition: all 0.3s ease;
}

.theme-icon.moon-icon {
    display: none;
}

body.dark-mode .theme-icon.sun-icon {
    display: none;
}

body.dark-mode .theme-icon.moon-icon {
    display: block;
}

/* 移动端适配主题按钮 */
@media (max-width: 767px) {
    .theme-toggle {
        width: 20px;
        height: 20px;
        margin-left: 6px;
    }
    
    .theme-icon {
        width: 14px;
        height: 14px;
    }
}

/* 文章布局样式 */
.article-layout {
    display: flex;
    gap: 30px;
    max-width: 1100px; /* 有目录时的宽度 */
    margin: 0 auto;
    padding: 30px;
}

/* 当没有目录侧边栏时，使用与首页一致的宽度 */
.article-layout:not(.has-toc) {
    max-width: 800px;
}

.article-main {
    flex: 1;
    min-width: 0;
    background: var(--card-bg);
    padding: 30px;
    transition: background-color 0.3s ease;
}

/* 没有目录时，主内容区占满整个容器 */
.article-layout:not(:has(.toc-sidebar)) .article-main {
    max-width: 100%;
}

.toc-sidebar {
    width: 280px;
    position: sticky;
    top: 30px;
    height: fit-content;
    background: var(--card-bg);
    padding: 20px;
    transition: background-color 0.3s ease;
}

.toc-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
    padding-bottom: 8px;
}

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

.toc-item {
    margin: 0;
}

.toc-item a {
    display: block;
    color: var(--muted-color);
    text-decoration: none;
    padding: 4px 0;
    font-size: 13px;
    line-height: 1.4;
    transition: color 0.3s ease;
    border-left: 2px solid transparent;
    padding-left: 8px;
    margin-left: 0;
}

.toc-item a:hover {
    color: var(--link-color);
}

.toc-item.active a {
    color: var(--link-color);
    border-left-color: var(--link-color);
}

.toc-item.level-2 a {
    margin-left: 12px;
}

.toc-item.level-3 a {
    margin-left: 24px;
}

.toc-item.level-4 a {
    margin-left: 36px;
}

/* 响应式设计 */
@media (max-width: 1023px) {
    .article-layout {
        flex-direction: column;
        padding: 20px;
    }
    
    .toc-sidebar {
        width: 100%;
        position: static;
        order: -1;
        margin-bottom: 20px;
    }
    
    .article-main {
        padding: 20px;
    }
    
    /* 移动端目录折叠功能 */
    .toc-title {
        cursor: pointer;
        user-select: none;
        display: flex;
        align-items: center;
        justify-content: space-between;
        position: relative;
    }
    
    .toc-toggle {
        font-size: 14px;
        color: var(--muted-color);
        transition: transform 0.3s ease;
        margin-left: 8px;
    }
    
    .toc-list {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .toc-sidebar.expanded .toc-list {
        max-height: 500px;
    }
    
    .toc-sidebar.expanded .toc-toggle {
        transform: rotate(180deg);
    }
}

@media (max-width: 767px) {
    .toc-sidebar {
        padding: 15px;
    }
    
    .article-main {
        padding: 15px;
    }
    
    .toc-item a {
        font-size: 12px;
    }
}