/* ============================================
   静态博客 — 全局样式
   ============================================ */

/* ---- CSS 变量 ---- */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-code: #f1f5f9;
    --color-border: #e2e8f0;
    --color-code-bg: #1e293b;
    --color-code-text: #e2e8f0;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-danger: #dc2626;
    --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --color-card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial,
        sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "SF Mono",
        Consolas, "Liberation Mono", Menlo, monospace;
    --max-width: 720px;
    --max-width-wide: 960px;
    --radius: 8px;
    --radius-sm: 4px;
}

/* ---- 重置 ---- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.15s;
}
a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
}

/* ---- 布局 ---- */
.container {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---- 导航栏 ---- */
.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.92);
}

.header-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}
.site-title:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: 8px;
    align-items: center;
}

.site-nav a {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
}
.site-nav a:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    text-decoration: none;
}
.site-nav a.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* ---- 首页主区域 ---- */
.hero {
    text-align: center;
    padding: 48px 20px 32px;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.hero p {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
    max-width: 480px;
    margin: 0 auto;
}

/* ---- 分类筛选 ---- */
.filter-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0 0 32px;
}

.filter-btn {
    padding: 7px 18px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-bg);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 500;
}
.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* ---- 文章列表 ---- */
.post-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding-bottom: 60px;
}

.post-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    background: var(--color-bg);
    transition: box-shadow 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
}
.post-card:hover {
    box-shadow: var(--color-card-hover-shadow);
    transform: translateY(-2px);
}

.post-card-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.post-card h2 {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 8px;
}
.post-card h2 a {
    color: var(--color-text);
}
.post-card h2 a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.post-card-summary {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    flex: 1;
    margin-bottom: 16px;
}

.post-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding-top: 12px;
}

.post-card-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.post-card-tags span {
    background: var(--color-bg-secondary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.post-card-date {
    white-space: nowrap;
}

/* ---- 空状态 ---- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
    grid-column: 1 / -1;
}
.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.3;
}
.empty-state p {
    font-size: 1rem;
}

/* ---- 文章详情页 ---- */
.article-header {
    padding: 40px 0 24px;
}

.article-header .breadcrumb {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}
.article-header .breadcrumb a {
    color: var(--color-text-secondary);
}
.article-header .breadcrumb span {
    margin: 0 6px;
}

.article-header h1 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.35;
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.article-meta .category-badge {
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.article-meta .tags {
    display: flex;
    gap: 6px;
}
.article-meta .tags span {
    background: var(--color-bg-secondary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* ---- HTML 程序展示 ---- */
.html-program-wrapper {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 24px 0;
}

.html-program-wrapper iframe {
    width: 100%;
    border: none;
    display: block;
}

.html-program-actions {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
}

.html-program-actions a {
    color: var(--color-primary);
    font-weight: 500;
}

/* ---- 文章正文排版 ---- */
.article-body {
    font-size: 1.05rem;
    line-height: 1.8;
    padding-bottom: 48px;
}

.article-body h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 40px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 32px 0 12px;
}

.article-body h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 24px 0 8px;
}

.article-body p {
    margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
    margin: 0 0 16px 24px;
}

.article-body li {
    margin-bottom: 6px;
}

.article-body blockquote {
    border-left: 4px solid var(--color-primary);
    margin: 20px 0;
    padding: 12px 20px;
    background: var(--color-bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-secondary);
}

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

.article-body hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 32px 0;
}

/* ---- 代码块 ---- */
.article-body code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-bg-code);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--color-primary-dark);
}

.article-body pre {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 20px 24px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 20px 0;
    line-height: 1.6;
    font-size: 0.875rem;
}

.article-body pre code {
    background: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

/* ---- 图片展示（gallery） ---- */
.article-body .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.article-body .gallery img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    transition: transform 0.2s;
}
.article-body .gallery img:hover {
    transform: scale(1.02);
}

/* ---- 评论区 ---- */
.comments-section {
    border-top: 1px solid var(--color-border);
    padding-top: 32px;
    margin-bottom: 60px;
}

.comments-section h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.giscus {
    min-height: 300px;
}

/* ---- 页脚 ---- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 28px 20px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---- 404 ---- */
.not-found {
    text-align: center;
    padding: 80px 20px;
}

.not-found h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.not-found p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

/* ---- 响应式 ---- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .post-list {
        grid-template-columns: 1fr;
    }

    .article-header h1 {
        font-size: 1.4rem;
    }

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

    .article-body pre {
        padding: 16px;
        font-size: 0.8rem;
    }

    .header-inner {
        height: 52px;
    }

    .site-title {
        font-size: 1.1rem;
    }

    .site-nav a {
        padding: 4px 10px;
        font-size: 0.825rem;
    }
}

@media (max-width: 480px) {
    .filter-bar {
        gap: 6px;
    }
    .filter-btn {
        padding: 6px 14px;
        font-size: 0.8rem;
    }
}