/* ✅ 09 — Header Container (.top) */
.top{ display:flex; align-items:center; gap:12px; padding:18px 16px; position:sticky; top:0; z-index:20;
    background:rgba(10,25,47,.97); border-bottom:1px solid var(--border); box-shadow: 0 4px 16px rgba(0,0,0,.3); }