assets/styles/header.css

/* header.css, tab-panel show/hide toggles driven by .active.
   The CARBON title, tagline and tab strip used to live here; they're now
   part of the editorial hero in banner.css. This file only retains the
   class that gates panel visibility based on the active tab. */

/* --- Tab panels --- */
.tab-panel { display: none; }
.tab-panel.active { display: block; }