/* ===== 动态生成的主题样式 ===== */
:root {
    --primary: #f472b6;
    --primary-dark: #f472b6dd;
    --secondary: #4a5568;
    --bg: #fff5f7;
    --card-bg: #ffffff;
    --text: #1a202c;
    --text-light: #1a202caa;
    --link: #f472b6;
    --gray-light: #fff5f7dd;
    --gray-border: #1a202c22;
    --shadow: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: calc(var(--radius) / 2);
    --transition: 0.25s ease;
    --body-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --heading-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --site-width: 1200px;
}

* { margin:0; padding:0; box-sizing:border-box; }
body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--body-font);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); text-decoration: none; }
.container { max-width: var(--site-width); margin: 0 auto; padding: 0 24px; }

/* 页眉 */
.site-header {
    background: var(--secondary);
    color: #fff;
    padding: 20px 0;
    border-bottom: 4px solid var(--primary);
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.site-brand { display: flex; align-items: center; gap: 14px; }
.site-logo { max-height: 48px; width: auto; border-radius: var(--radius-sm); }
.site-title { font-size: 1.6rem; font-weight: 700; font-family: var(--heading-font); }
.site-title a { color: #fff; }
.site-title a:hover { opacity: 0.8; }
.site-desc { font-size: 0.9rem; opacity: 0.75; }
.header-nav { display: flex; gap: 28px; flex-wrap: wrap; align-items: center; }
.header-nav a { color: #e2e8f0; font-weight: 500; padding: 4px 0; border-bottom: 2px solid transparent; transition: all var(--transition); }
.header-nav a:hover { color: #fff; border-bottom-color: var(--primary); text-decoration: none; }

/* 首页布局 */
.index-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
    margin: 40px 0;
}
.post-grid { display: grid; gap: 28px; }

/* 文章卡片 */
.post-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--gray-border); }
.post-card-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; line-height: 1.4; font-family: var(--heading-font); }
.post-card-title a { color: var(--text); }
.post-card-title a:hover { color: var(--primary); }
.post-card-meta { font-size: 0.8rem; color: #a0aec0; display: flex; gap: 16px; margin-bottom: 10px; }
.post-card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.post-card-tags .tag { background: var(--gray-light); padding: 0 12px; border-radius: 20px; font-size: 0.7rem; font-weight: 500; color: var(--text-light); }
.post-card-summary { font-size: 0.9rem; color: var(--text-light); margin-bottom: 16px; flex: 1; }
.read-more { font-weight: 600; font-size: 0.9rem; color: var(--primary); align-self: flex-start; padding: 6px 16px; border-radius: 20px; background: var(--gray-light); transition: all var(--transition); }
.read-more:hover { background: var(--primary); color: #fff; }

/* 侧边栏 */
.sidebar { position: sticky; top: 100px; }
.sidebar-widget { background: var(--card-bg); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border: 1px solid var(--gray-border); }
.sidebar-widget h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); }
.sidebar-article-list { list-style: none; padding: 0; margin: 0; max-height: 70vh; overflow-y: auto; }
.sidebar-article-list li { padding: 10px 0; border-bottom: 1px solid var(--gray-light); display: flex; justify-content: space-between; align-items: center; }
.sidebar-article-list a { color: var(--text); font-size: 0.9rem; flex: 1; }
.sidebar-article-list a:hover { color: var(--primary); }
.sidebar-date { font-size: 0.7rem; color: #a0aec0; }

/* 文章详情 */
.article-detail-wrapper { max-width: 820px; margin: 40px auto; }
.article-detail { background: var(--card-bg); border-radius: var(--radius); padding: 40px 48px; box-shadow: var(--shadow); }
.article-detail .article-title { font-size: 2.4rem; font-weight: 800; line-height: 1.2; margin-bottom: 12px; font-family: var(--heading-font); }
.article-meta { font-size: 0.9rem; color: #a0aec0; display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--gray-light); }
.article-tags .tag { background: var(--gray-light); padding: 2px 14px; border-radius: 20px; font-size: 0.75rem; }
.article-body { font-size: 1.1rem; line-height: 1.8; }
.article-body h1, .article-body h2, .article-body h3, .article-body h4 {
    margin: 2em 0 0.6em;
    font-weight: 700;
    scroll-margin-top: 100px;
    font-family: var(--heading-font);
}
.article-body h1 { font-size: 2rem; }
.article-body h2 { font-size: 1.6rem; }
.article-body h3 { font-size: 1.3rem; }
.article-body h4 { font-size: 1.1rem; }
.article-body p { margin-bottom: 1.4em; }
.article-body ul, .article-body ol { padding-left: 1.8em; margin-bottom: 1.4em; }
.article-body code { background: var(--gray-light); padding: 2px 8px; border-radius: 4px; font-size: 0.9em; }
.article-body pre { background: #1a202c; color: #e2e8f0; padding: 20px; border-radius: var(--radius-sm); overflow-x: auto; }
.article-body pre code { background: none; color: inherit; padding: 0; }
.article-body img { max-width: 100%; border-radius: var(--radius-sm); margin: 1.5em 0; box-shadow: var(--shadow); }
.article-body blockquote { border-left: 4px solid var(--primary); padding-left: 20px; margin: 1.5em 0; color: var(--text-light); font-style: italic; }

/* 目录 */
/* 目录容器 - 默认折叠（只显示按钮） */
.toc-container {
    position: fixed;
    top: 130px;
    right: 20px;
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}
.toc-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 2;
}
.toc-toggle-btn:hover {
    transform: scale(1.05);
    background: var(--primary-dark);
}
.toc-arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}
/* 展开时箭头旋转 */
.toc-container:not(.collapsed) .toc-arrow {
    transform: rotate(90deg);
}
/* 目录内容 - 默认隐藏 */
.toc-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--gray-border);
    max-height: 70vh;
    overflow-y: auto;
    width: 260px;
    margin-top: 8px;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all 0.3s ease;
}
/* 展开时显示内容 */
.toc-container:not(.collapsed) .toc-content {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.toc-content h4 {
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--secondary);
    font-size: 0.95rem;
}
.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.toc-list li {
    padding: 6px 0;
    border-bottom: 1px solid var(--gray-light);
}
.toc-list li:last-child {
    border-bottom: none;
}
.toc-list a {
    color: var(--text-light);
    display: block;
    padding: 2px 0;
    transition: all var(--transition);
    font-size: 0.85rem;
}
.toc-list a:hover {
    color: var(--primary);
}
.toc-list .toc-h2 { padding-left: 0; font-weight: 500; }
.toc-list .toc-h3 { padding-left: 18px; }
.toc-list .toc-h4 { padding-left: 36px; }

/* 移动端调整 */
@media (max-width: 768px) {
    .toc-container {
        top: auto;
        bottom: 30px;
        right: 20px;
    }
    .toc-toggle-btn {
        width: 48px;
        height: 48px;
        font-size: 1.4rem;
    }
    .toc-content {
        width: 220px;
        max-height: 60vh;
        padding: 14px 16px;
    }
    /* 移动端首页网格强制单列（已经在之前的修复中加入，这里再次确认） */
    .post-grid {
        grid-template-columns: 1fr !important;
    }
}

/* 页脚 */
.site-footer {
    background: var(--secondary);
    color: #cbd5e1;
    padding: 30px 0;
    margin-top: 40px;
    border-top: 4px solid var(--primary);
}
.footer-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.footer-social { display: flex; gap: 18px; }
.footer-social a { color: #cbd5e1; font-size: 1.3rem; transition: all var(--transition); }
.footer-social a:hover { color: #fff; transform: scale(1.1); }

/* 响应式 */
@media (max-width: 1024px) {
    .index-layout { grid-template-columns: 1fr; }
    .post-grid { grid-template-columns: repeat(2, 1fr); }
    .sidebar { position: static; margin-top: 30px; }
    .toc-container { display: none; }
}
@media (max-width: 768px) {
    .post-grid {
        grid-template-columns: 1fr !important;
    }
    .post-grid { grid-template-columns: 1fr; }
    .article-detail { padding: 24px 20px; }
    .article-detail .article-title { font-size: 1.8rem; }
    .footer-inner { grid-template-columns: 1fr; text-align: center; }
    .site-header { position: relative; }
}
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .post-card { padding: 16px; }
    .article-detail { padding: 16px; }
    .article-body { font-size: 1rem; }
}