/* ==========================================
   r0f2 / 技术札记 - 全站统一样式
   ========================================== */

/* CSS Variables */
:root {
    --primary: #1a1a2e;
    --secondary: #4a4a6a;
    --accent: #2563eb;
    --bg: #fafbfc;
    --card-bg: #ffffff;
    --code-bg: #f8fafc;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
}

/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", 
                -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.8;
    background: var(--bg);
    color: var(--text-primary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 全站背景层 - 图片背景系统 */
body.bg-home::before {
    background:
        linear-gradient(rgba(15, 23, 42, .55), rgba(15, 23, 42, .75)),
        url("/images/bg-home.jpg") center / cover no-repeat fixed;
}

body.bg-article::before {
    background:
        linear-gradient(rgba(15, 23, 42, .60), rgba(15, 23, 42, .82)),
        url("/images/bg-article.jpg") center / cover no-repeat fixed;
}

body.bg-projects::before {
    background:
        linear-gradient(rgba(15, 23, 42, .58), rgba(15, 23, 42, .78)),
        url("/images/bg-projects.jpg") center / cover no-repeat fixed;
}

body.bg-soft::before {
    background:
        linear-gradient(rgba(15, 23, 42, .45), rgba(15, 23, 42, .65)),
        url("/images/bg-soft.jpg") center / cover no-repeat fixed;
}

/* 噪点纹理叠加 - 高级感 */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    opacity: 0.35;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 页面容器 */
.page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 24px 80px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(250, 251, 252, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 a {
    color: var(--primary);
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.3px;
}

.logo-mark {
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
    font-size: 14px;
    font-weight: 600;
}

.nav { display: flex; gap: 24px; }

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    padding: 6px 0;
    transition: color 0.2s ease;
}

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

/* ==========================================
   三列布局系统
   ========================================== */
.layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr) 260px;
    gap: 32px;
    align-items: start;
}

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar h3 {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

/* 目录样式 */
.toc {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.toc h3 {
    margin: 0 0 12px 0;
    font-size: 12px;
}

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

.toc li { margin-bottom: 4px; }

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 13px;
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
}

.toc a:hover {
    background: var(--code-bg);
    color: var(--primary);
    border-left-color: var(--accent);
}

/* 文章头部 */
.article-header {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.article-header h1 {
    font-size: 32px;
    margin-bottom: 16px;
    line-height: 1.4;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--primary);
}

.meta {
    display: flex;
    gap: 20px;
    color: var(--text-tertiary);
    font-size: 14px;
}

.tags {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.tag {
    background: var(--code-bg);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* 侧边卡片 */
.sidebar-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.article-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.related-links { list-style: none; }

.related-links li { margin-bottom: 8px; }

.related-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    display: block;
    padding: 8px 12px;
    background: var(--code-bg);
    border-radius: 4px;
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
}

.related-links a:hover {
    color: var(--accent);
    border-left-color: var(--accent);
    background: var(--card-bg);
}

/* ==========================================
   正文内容样式
   ========================================== */
.content { font-size: 16px; color: var(--text-primary); }

.content > * { margin-bottom: 24px; }

.content h2 {
    font-size: 24px;
    margin: 40px 0 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--primary);
}

.content h3 {
    font-size: 18px;
    margin: 28px 0 14px;
    font-weight: 600;
    letter-spacing: -0.2px;
    color: var(--primary);
}

.content p {
    text-align: justify;
    color: var(--text-secondary);
    line-height: 1.85;
}

.content ul, .content ol { margin: 20px 0 20px 24px; }

.content li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    padding-left: 8px;
}

.content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

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

/* ==========================================
   亮色代码块 + 语法高亮
   ========================================== */
.content pre {
    background: #f8f9fa !important;
    color: #24292e !important;
    padding: 24px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 24px 0;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
    font-size: 13px;
    line-height: 1.7;
    border: 1px solid #e1e4e8;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.05);
}

.content code {
    font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
}

.content p code, .content li code {
    background: var(--code-bg) !important;
    color: #d63384 !important;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* 语法高亮 - GitHub Light 风格 */
code .keyword { color: #d73a49; font-weight: 600; }
code .function { color: #6f42c1; }
code .string { color: #032f62; }
code .comment { color: #6a737d; font-style: italic; }
code .number { color: #005cc5; }
code .operator { color: #d73a49; }
code .variable { color: #e36209; }
code .builtin { color: #005cc5; }
code .type { color: #6f42c1; }
code .property { color: #005cc5; }
code .tag { color: #22863a; }
code .attr-name { color: #6f42c1; }

/* 命令行块 */
.command {
    background: #f1f8ff !important;
    color: #24292e !important;
    padding: 20px 24px;
    border-radius: 8px;
    margin: 24px 0;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
    font-size: 13px;
    line-height: 1.7;
    border: 1px solid #c8e1ff;
}

.command::before {
    content: "$";
    color: #d73a49;
    font-weight: 600;
    margin-right: 10px;
}

/* ==========================================
   信息卡片
   ========================================== */
.info-box {
    padding: 20px 24px;
    border-radius: 8px;
    margin: 24px 0;
    border-left: 4px solid;
    background: var(--card-bg);
}

.info-box.tip { 
    border-color: #2da44e; 
    background: #f6fff8;
}

.info-box.warning { 
    border-color: #bf8700; 
    background: #fffbeb;
}

.info-box.info { 
    border-color: #0969da; 
    background: #f6f8fa;
}

.info-box strong {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--primary);
}

.info-box ul { margin: 12px 0 0 !important; }
.info-box li { margin-bottom: 6px !important; }

/* ==========================================
   功能卡片网格
   ========================================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.feature-card {
    background: var(--card-bg);
    padding: 24px 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.feature-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.feature-card h4 { margin: 12px 0 8px; font-size: 15px; }

.feature-card p { 
    font-size: 13px; 
    color: var(--text-secondary); 
    margin: 0; 
}

/* ==========================================
   项目树结构
   ========================================== */
.project-tree {
    background: #f6f8fa !important;
    color: #24292e !important;
    padding: 24px;
    border-radius: 8px;
    margin: 24px 0;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
    font-size: 13px;
    line-height: 1.9;
    border: 1px solid #e1e4e8;
    overflow-x: auto;
}

.project-tree .folder { color: #116329; }
.project-tree .file { color: #0550ae; }
.project-tree .comment { color: #6a737d; font-style: italic; }

/* ==========================================
   数据表格
   ========================================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.data-table th, .data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--code-bg);
    font-weight: 600;
    color: var(--primary);
}

.data-table tr:hover { background: var(--code-bg); }
.data-table tr:last-child td { border-bottom: none; }

/* ==========================================
   图表卡片
   ========================================== */
.chart-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.chart-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.chart-card h4 { margin: 12px 0 8px; font-size: 14px; }
.chart-card p { font-size: 12px; color: var(--text-secondary); margin: 0; }

/* ==========================================
   Footer
   ========================================== */
footer {
    text-align: center;
    padding: 48px 24px 32px;
    margin-top: 56px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

footer p { font-size: 14px; color: var(--text-tertiary); }

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .layout {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .sidebar h3 { display: none; }
    .toc { order: 1; }
    .sidebar-card:last-child { order: 2; }
}

@media (max-width: 640px) {
    header { 
        flex-direction: column; 
        gap: 16px; 
        text-align: center; 
    }
    
    .nav { 
        gap: 16px; 
        flex-wrap: wrap; 
        justify-content: center; 
    }
    
    .article-header { padding: 28px 20px; }
    .article-header h1 { font-size: 24px; }
    
    .sidebar { grid-template-columns: 1fr; }
    .meta { flex-direction: column; gap: 4px; }
    
    .feature-grid,
    .chart-gallery {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   动画效果
   ========================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.article-header,
.sidebar-card,
.toc {
    animation: fadeIn 0.4s ease-out;
}

/* 链接悬停 */
a {
    transition: color 0.2s ease;
}

/* 选中文本 */
::selection {
    background: rgba(37, 99, 235, 0.2);
    color: var(--primary);
}