/* 通用中性主题（default）—— 干净、克制、不绑定品牌色 */
:root {
    --df-text: #1f2328;
    --df-muted: #6b7280;
    --df-line: #e6e8eb;
    --df-bg: #ffffff;
    --df-soft: #f7f8fa;
    --df-accent: #1f6feb;
    --df-radius: 10px;
    --df-wrap: 1080px;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--df-bg);
    color: var(--df-text);
    font: 15px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}
a { color: var(--df-text); text-decoration: none; }
a:hover { color: var(--df-accent); }
img { max-width: 100%; height: auto; display: block; }
.df-wrap { width: 100%; max-width: var(--df-wrap); margin: 0 auto; padding: 0 20px; }
.df-muted { color: var(--df-muted); }

/* 头部 */
.df-header { border-bottom: 1px solid var(--df-line); background: #fff; position: sticky; top: 0; z-index: 10; }
.df-header-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.df-brand { font-size: 18px; font-weight: 700; letter-spacing: .5px; }
.df-nav { display: flex; gap: 22px; font-size: 14px; }
.df-nav a { color: var(--df-muted); }
.df-nav a:hover { color: var(--df-accent); }

/* 主体 */
.df-main { padding: 34px 0 10px; min-height: 60vh; }
.df-hero { padding: 26px 0 30px; border-bottom: 1px solid var(--df-line); margin-bottom: 26px; }
.df-hero h1 { margin: 0 0 10px; font-size: 30px; line-height: 1.35; letter-spacing: -.3px; }
.df-hero p { margin: 0; color: var(--df-muted); }

/* 列表 */
.df-list { display: grid; gap: 18px; }
.df-card { border: 1px solid var(--df-line); border-radius: var(--df-radius); padding: 20px 22px; transition: box-shadow .18s, border-color .18s; }
.df-card:hover { border-color: #d7dbe0; box-shadow: 0 6px 20px rgba(15, 23, 42, .06); }
.df-card h2 { margin: 0 0 8px; font-size: 18px; line-height: 1.5; }
.df-card h2 a { color: var(--df-text); }
.df-card p { margin: 0; color: var(--df-muted); font-size: 14px; }
.df-meta { display: flex; gap: 14px; margin-top: 12px; font-size: 12.5px; color: var(--df-muted); }

/* 文章详情 */
.df-article { max-width: 760px; }
.df-article h1 { font-size: 27px; line-height: 1.45; margin: 0 0 14px; }
.df-article .df-art-meta { color: var(--df-muted); font-size: 13px; padding-bottom: 18px; border-bottom: 1px solid var(--df-line); margin-bottom: 24px; }
.df-content { font-size: 15.5px; line-height: 1.9; }
.df-content h2 { font-size: 20px; margin: 30px 0 12px; }
.df-content h3 { font-size: 17px; margin: 24px 0 10px; }
.df-content p { margin: 0 0 16px; }
.df-content img { border-radius: var(--df-radius); margin: 18px 0; }
.df-content ul, .df-content ol { padding-left: 22px; margin: 0 0 16px; }
.df-content blockquote { margin: 18px 0; padding: 10px 16px; border-left: 3px solid var(--df-line); background: var(--df-soft); color: var(--df-muted); }
.df-content table { width: 100%; border-collapse: collapse; margin: 18px 0; }
.df-content td, .df-content th { border: 1px solid var(--df-line); padding: 8px 10px; font-size: 14px; }
.df-content code { background: var(--df-soft); padding: 2px 6px; border-radius: 5px; font-size: 13.5px; }

/* 上一篇 / 下一篇 */
.df-nav2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 34px 0 0; }
.df-nav2 a { border: 1px solid var(--df-line); border-radius: var(--df-radius); padding: 14px 16px; font-size: 14px; }
.df-nav2 span { display: block; color: var(--df-muted); font-size: 12.5px; margin-bottom: 5px; }

/* 标签 */
.df-tags { margin: 26px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.df-tags a { font-size: 12.5px; color: var(--df-muted); border: 1px solid var(--df-line); border-radius: 999px; padding: 4px 12px; }
.df-tags a:hover { border-color: var(--df-accent); color: var(--df-accent); }

/* 搜索 */
.df-search { display: flex; gap: 10px; margin: 0 0 26px; }
.df-search input { flex: 1; height: 42px; padding: 0 14px; font-size: 15px; border: 1px solid var(--df-line); border-radius: var(--df-radius); outline: none; }
.df-search input:focus { border-color: var(--df-accent); }
.df-search button { height: 42px; padding: 0 22px; border: 0; border-radius: var(--df-radius); background: var(--df-text); color: #fff; font-size: 15px; cursor: pointer; }
.df-search button:hover { background: var(--df-accent); }

/* 分页 */
.df-pager { display: flex; justify-content: center; gap: 8px; margin: 30px 0 10px; }
.df-pager a, .df-pager span { min-width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--df-line); border-radius: 8px; font-size: 14px; color: var(--df-muted); padding: 0 10px; }
.df-pager .on { background: var(--df-text); border-color: var(--df-text); color: #fff; }

/* 页脚 */
.df-footer { border-top: 1px solid var(--df-line); margin-top: 50px; padding: 26px 0; font-size: 13px; color: var(--df-muted); }
.df-footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

@media (max-width: 720px) {
    .df-hero h1 { font-size: 24px; }
    .df-nav { gap: 14px; font-size: 13px; }
    .df-nav2 { grid-template-columns: 1fr; }
    .df-footer-inner { justify-content: flex-start; }
}