:root{--bg:#f7f7f9;--card:#ffffff;--accent:#0f62fe;--text:#111827}
*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial;line-height:1.6;color:var(--text);background:var(--bg);margin:0}
.container{max-width:900px;margin:0 auto;padding:20px}
.site-header{background:linear-gradient(90deg,#628ac359,#3d7fdb61);padding:28px 0}
.site-title{margin:0;font-size:1.6rem}
.site-desc{margin:6px 0 0;color:#374151}
main.container{display:grid;grid-template-columns:1fr 280px;gap:24px;padding-top:20px}
.post-list{list-style:none;padding:0;margin:0}
.post-tree{list-style:none;padding-left:0;margin:0}
.post-tree .post-tree{padding-left:20px;margin-top:10px}
.post-item{background:var(--card);padding:16px;border-radius:8px;margin-bottom:12px;box-shadow:0 1px 2px rgba(0,0,0,0.04)}
.post-item a{color:var(--accent);text-decoration:none;font-weight:600}
.post-meta{color:#6b7280;margin-top:6px;font-size:.9rem}
.post-excerpt{margin-top:8px;color:#374151}
.folder-item{margin-bottom:16px}
.folder-name{display:inline-block;margin-bottom:10px;font-weight:700;color:#1f2937}
.post-article ul,.post-article ol{padding-left:24px}
.post-article li+li{margin-top:6px}
.sidebar{background:var(--card);padding:16px;border-radius:8px}
.site-footer{padding:18px 0;text-align:center;color:#6b7280}
@media (max-width:820px){main.container{grid-template-columns:1fr;padding:16px} .sidebar{order:2}}