:root { --space:16px; --maxw:960px; }
*{box-sizing:border-box}
html,body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Arial,Helvetica,sans-serif;color:#222;background:#fff}
.container{max-width:var(--maxw);margin:0 auto;padding:0 var(--space)}
a{text-decoration:none} a:hover{text-decoration:underline}
.card{border-radius:14px}
.nav-scroller{position:sticky;top:56px;z-index:1020;background:#fff;border-bottom:1px solid #eee}
.nav-scroller .nav{display:flex;gap:.5rem;overflow:auto;white-space:nowrap;padding:.5rem 1rem}
.bb-cit{border-left:4px solid #e5e5e5;padding:.5rem .75rem;background:#fafafa;border-radius:8px}
.bb-code{background:#0f172a0d;border:1px solid #e5e7eb;border-radius:10px;padding:.75rem;overflow:auto;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,'Liberation Mono','Courier New',monospace;font-size:0.9rem}
.bb-u{text-decoration:underline}
.bb-img{max-height:420px;border-radius:8px}