.header-mega { justify-content: space-between; align-items: center; }
.mega-wrap { position: relative; }
.mega-trigger { min-width: 280px; text-align: left; }
.mega-menu { position: absolute; right: 0; top: calc(100% + 8px); width: 640px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 16px 40px rgba(15,23,42,.12); padding: 12px; z-index: 50; }
.mega-menu.hidden { display: none; }
.mega-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.mega-col-title { font-size: 11px; font-weight: 700; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; }
.mega-col .mode-btn { width: 100%; font-size: 11px; padding: 6px 8px; }
.layout-mega { display: grid; grid-template-columns: 260px 1fr 240px; }
.editor-mock { min-height: 420px; margin: 16px; flex: 1; }