html[data-theme="dark"]{
 --bg:#151214;--surface:#201b1e;--text:#ffffff;--muted:rgba(255,255,255,.72);--border:rgba(255,255,255,.16);--shadow:0 18px 50px rgba(0,0,0,.28);
}
html[data-theme="dark"] .site-header{background:rgba(21,18,20,.92)}
html[data-theme="dark"] .cardx img,html[data-theme="dark"] .blog-card img{filter:brightness(.9)}