/**
 * 步子哥的博客 - 增强样式表
 * 淡黄色亚麻布纹理背景，支持暗色模式和丰富的交互效果
 */

:root {
    --bg-primary: #faf8f0;
    --bg-secondary: #fdfcf7;
    --bg-tertiary: #f5f2e8;
    --text-primary: #333333;
    --text-secondary: #444444;
    --text-muted: #7a6f5d;
    --border-color: #e8e4d9;
    --border-light: #e0dcd2;
    --accent-primary: #8b6914;
    --accent-secondary: #5c4d3c;
    --accent-hover: #6b5010;
    --shadow-soft: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --code-bg: #2d2d2d;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Source Code Pro", Consolas, Monaco, monospace;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --border-radius-sm: 4px;
    --border-radius-md: 6px;
    --border-radius-lg: 8px;
    --border-radius-xl: 10px;
}

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

html {
    min-height: 100%;
    scroll-behavior: smooth;
}

::selection {
    background-color: rgba(139, 105, 20, 0.2);
    color: inherit;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(139, 129, 107, 0.03) 2px,
            rgba(139, 129, 107, 0.03) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(139, 129, 107, 0.03) 2px,
            rgba(139, 129, 107, 0.03) 4px
        );
    min-height: 100vh;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
    background-color: rgba(255, 255, 253, 0.95);
    min-height: 100vh;
    box-shadow: 0 0 60px rgba(0, 0, 0, 0.04);
}

/* 文章页面使用更宽的容器以容纳侧边目录 */
.container.has-toc {
    max-width: 1200px;
}

.header {
    text-align: center;
    padding-bottom: 32px;
    margin-bottom: 44px;
    border-bottom: 2px solid var(--border-color);
}

.site-title {
    font-size: 2.4em;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.site-title a {
    color: var(--accent-secondary);
    text-decoration: none;
    background: linear-gradient(135deg, var(--accent-secondary) 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all var(--transition-medium);
}

.site-title a:hover {
    transform: scale(1.02);
}

.site-description {
    color: var(--text-muted);
    font-size: 1.1em;
    font-style: italic;
    opacity: 0.9;
}

.breadcrumb {
    margin-top: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9em;
    padding: 4px 8px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--accent-primary);
    background-color: var(--bg-tertiary);
}

.breadcrumb span {
    color: var(--text-muted);
    font-size: 0.9em;
}

.main-content {
    padding: 20px 0;
}

.page-title {
    font-size: 2em;
    color: var(--accent-secondary);
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.parent-link {
    margin-bottom: 28px;
}

.parent-link a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95em;
    padding: 10px 18px;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-medium);
}

.parent-link a:hover {
    background-color: var(--border-color);
    color: var(--accent-secondary);
    transform: translateX(-3px);
}

.directory-list,
.article-list {
    margin-bottom: 44px;
}

.directory-list h2,
.article-list h2 {
    font-size: 1.25em;
    color: var(--accent-secondary);
    margin-bottom: 20px;
    padding-left: 8px;
    font-weight: 600;
}

.directory-list ul,
.article-list ul {
    list-style: none;
    display: grid;
    gap: 12px;
}

.directory-list li,
.article-list li {
    margin: 0;
}

.directory-list a,
.article-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.05em;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.directory-list a::before,
.article-list a::before {
    font-size: 1.2em;
    flex-shrink: 0;
}

.directory-list a::after,
.article-list a::after {
    content: "→";
    position: absolute;
    right: 20px;
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--transition-medium);
    color: var(--accent-primary);
}

.directory-list a:hover,
.article-list a:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-light);
    color: var(--accent-secondary);
    transform: translateX(4px);
    box-shadow: 0 4px 12px var(--shadow-soft);
}

.directory-list a:hover::after,
.article-list a:hover::after {
    opacity: 1;
    transform: translateX(0);
}

.article {
    background-color: var(--bg-secondary);
    padding: 44px;
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px var(--shadow-soft);
}

.article-title {
    font-size: 2.2em;
    color: var(--text-primary);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.article-content {
    color: var(--text-secondary);
    line-height: 1.85;
    overflow-wrap: break-word;
    word-wrap: break-word;
    min-width: 0; /* 防止内容溢出 flex/grid 容器 */
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    color: var(--accent-secondary);
    margin-top: 2.5em;
    margin-bottom: 1em;
    line-height: 1.4;
    font-weight: 600;
}

.article-content h1 { font-size: 1.9em; letter-spacing: -0.02em; }
.article-content h2 { font-size: 1.6em; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5em; }
.article-content h3 { font-size: 1.35em; }
.article-content h4 { font-size: 1.15em; }

.article-content p {
    margin-bottom: 1.6em;
    text-align: justify;
    orphans: 3;
    widows: 3;
}

.article-content a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px dotted var(--accent-primary);
    padding-bottom: 1px;
    transition: all var(--transition-fast);
}

.article-content a:hover {
    color: var(--accent-hover);
    border-bottom-style: solid;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    margin: 2em 0;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    display: block;
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.article-content img:hover {
    transform: scale(1.01);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.6em;
    padding-left: 2em;
}

.article-content li {
    margin-bottom: 0.6em;
}

.article-content li::marker {
    color: var(--accent-primary);
}

.article-content blockquote {
    margin: 1.8em 0;
    padding: 1.2em 1.6em;
    background-color: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    color: var(--text-muted);
    font-style: italic;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content pre {
    margin: 1.8em 0;
    padding: 0;
    background-color: #1e1e1e;
    border-radius: var(--border-radius-lg);
    overflow-x: auto;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    position: relative;
    max-width: 100%;
    border: 1px solid #333;
}

.article-content pre code {
    display: block;
    background: transparent;
    color: #d4d4d4;
    padding: 1.2em 1.4em;
    padding-top: 2.4em; /* 为语言标签留出空间 */
    font-size: 0.9em;
    line-height: 1.7;
    overflow-x: auto;
    tab-size: 4;
    -moz-tab-size: 4;
}

.article-content code {
    font-family: var(--font-mono);
    background-color: var(--bg-tertiary);
    padding: 0.2em 0.5em;
    border-radius: var(--border-radius-sm);
    font-size: 0.88em;
    color: var(--accent-primary);
}

.article-content pre code {
    background: transparent;
    padding: 1.2em 1.4em;
    padding-top: 2.4em;
    color: #d4d4d4;
    font-size: 0.9em;
    line-height: 1.7;
}

.article-content table {
    width: 100%;
    margin: 1.8em 0;
    border-collapse: separate;
    border-spacing: 0;
    background-color: #fff;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow-soft);
    display: block;
    overflow-x: auto;
}

.article-content th,
.article-content td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.article-content th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--accent-secondary);
    text-transform: uppercase;
    font-size: 0.85em;
    letter-spacing: 0.05em;
}

.article-content tr:first-child td {
    border-top: none;
}

.article-content tr td:first-child {
    border-left: none;
}

.article-content tr td:last-child {
    border-right: none;
}

.article-content tr:last-child td {
    border-bottom: none;
}

.article-content tr:hover td {
    background-color: var(--bg-tertiary);
}

.article-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 3em 0;
}

.article-content .code-copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 12px;
    font-size: 12px;
    font-family: var(--font-sans);
    opacity: 0;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    background: rgba(255, 255, 255, 0.1);
    color: #ccc;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast);
}

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

.article-content .code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.article-content .code-copy-btn.copied {
    background: rgba(76, 175, 80, 0.3);
    border-color: rgba(76, 175, 80, 0.5);
    color: #4caf50;
}

/* 代码块语言标签 */
.article-content .code-lang-label {
    position: absolute;
    top: 0;
    left: 0;
    padding: 4px 12px;
    font-size: 11px;
    font-family: var(--font-sans);
    font-weight: 600;
    color: #888;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid #333;
    border-right: 1px solid #333;
    border-radius: var(--border-radius-lg) 0 var(--border-radius-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-nav {
    margin-top: 44px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-start;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95em;
    padding: 12px 20px;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-medium);
}

.back-link:hover {
    background-color: var(--border-color);
    color: var(--accent-secondary);
    transform: translateX(-3px);
}

.footer {
    text-align: center;
    padding-top: 48px;
    margin-top: 48px;
    border-top: 2px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9em;
}

.footer p {
    margin: 0;
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
}

@media (max-width: 960px) {
    .container {
        max-width: 100%;
        padding: 32px 20px;
    }

    .article {
        padding: 32px 24px;
    }
}

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }

    .container {
        padding: 24px 16px;
    }

    .header {
        padding-bottom: 24px;
        margin-bottom: 32px;
    }

    .site-title {
        font-size: 2em;
    }

    .article {
        padding: 24px 20px;
        border-radius: var(--border-radius-lg);
    }

    .article-title {
        font-size: 1.7em;
    }

    .page-title {
        font-size: 1.6em;
    }

    .directory-list a,
    .article-list a {
        padding: 14px 16px;
        font-size: 1em;
    }

    .article-content pre {
        margin: 1.4em 0;
        border-radius: var(--border-radius-md);
    }

    .article-content pre code {
        padding: 1.2em;
        font-size: 0.85em;
    }

    .article-content h1 { font-size: 1.6em; }
    .article-content h2 { font-size: 1.35em; }
    .article-content h3 { font-size: 1.15em; }

    .breadcrumb {
        gap: 4px;
    }

    .breadcrumb a {
        font-size: 0.85em;
        padding: 3px 6px;
    }
}

@media print {
    body {
        background: white;
        font-size: 12pt;
    }

    .container {
        box-shadow: none;
        max-width: 100%;
        padding: 0;
    }

    .header,
    .footer,
    .article-nav,
    .parent-link,
    .code-copy-btn {
        display: none !important;
    }

    .article {
        border: none;
        padding: 0;
        box-shadow: none;
    }

    .article-content a {
        border-bottom: none;
        color: inherit;
    }

    .article-content img {
        box-shadow: none;
    }
}

.article-content .mermaid {
    text-align: center;
    margin: 2em 0;
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius-lg);
}

.article-content katex {
    font-size: 1.1em;
}

.article-content .katex-display {
    margin: 1.5em 0;
    padding: 1em;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    overflow-x: auto;
}

.article-content .footnote-ref {
    font-size: 0.8em;
    vertical-align: super;
    color: var(--accent-primary);
}

.article-content sup,
.article-content sub {
    font-size: 0.75em;
}

.article-content var {
    font-family: "Cambria Math", "Times New Roman", serif;
    font-style: italic;
}

.article-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    position: relative;
}

.article-toc {
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 16px;
    box-shadow: 0 2px 8px var(--shadow-soft);
    flex-shrink: 0;
    align-self: flex-start;
}

.toc-toggle {
    display: none;
    font-weight: 600;
    color: var(--accent-secondary);
    cursor: pointer;
    padding: 10px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 15px;
    transition: all var(--transition-fast);
}

.toc-toggle:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toc-content {
    display: block;
}

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

.toc-item {
    margin: 8px 0;
}

.toc-link {
    display: block;
    padding: 6px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.9em;
    line-height: 1.5;
}

.toc-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
    transform: translateX(3px);
}

.toc-link.active {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
    font-weight: 600;
    border-left: 3px solid var(--accent-primary);
}

.toc-text {
    display: inline-block;
}

@media (min-width: 1024px) {
    .article-wrapper {
        grid-template-columns: 240px 1fr;
        gap: 40px;
    }

    .article-toc {
        grid-column: 1;
        grid-row: 1;
        order: 1;
    }

    .article-content {
        grid-column: 2;
        grid-row: 1;
        order: 2;
        min-width: 0; /* 防止内容溢出 grid */
        max-width: 100%;
    }
}

/* 标签云样式 */
.tag-cloud {
    margin: 30px 0;
    padding: 20px;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    text-align: center;
    line-height: 2.5;
}

.tag-cloud-item {
    display: inline-block;
    margin: 5px 10px;
    padding: 5px 12px;
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.tag-cloud-item:hover {
    background-color: var(--accent-primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-medium);
}

/* 评论区域样式 */
.comments-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px solid var(--border-color);
}

.comments-section h2 {
    margin-bottom: 30px;
    color: var(--text-primary);
    font-size: 1.5em;
}

@media (max-width: 1023px) {
    .article-wrapper {
        grid-template-columns: 1fr;
    }

    .article-toc {
        grid-column: 1;
        position: relative;
        top: 0;
        max-height: none;
        margin-bottom: 30px;
    }

    .article-content {
        grid-column: 1;
    }

    .toc-toggle {
        display: block;
    }

    .toc-content {
        display: none;
    }

    .toc-content.show {
        display: block;
    }
}

@media (max-width: 640px) {
    .article-toc {
        padding: 15px;
    }

    .toc-link {
        padding: 5px 10px;
        font-size: 0.85em;
    }
}

@media print {
    .article-toc {
        display: none !important;
    }

    .article-wrapper {
        grid-template-columns: 1fr !important;
    }
}