.site-header nav{flex:1;justify-content:flex-end}
.admin-icon{flex:0 0 auto;display:grid;place-items:center;width:40px;height:40px;margin-left:8px;border:1px solid #c9bda9;border-radius:10px;background:linear-gradient(145deg,#fffdf8,#e9e2d5);box-shadow:0 5px 12px rgba(37,63,57,.12);color:var(--green);transition:transform .18s,box-shadow .18s}
.admin-icon svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.admin-icon:hover{transform:translateY(-2px);box-shadow:0 9px 18px rgba(37,63,57,.19)}
.subtabs{padding-top:18px}
.content-panel{margin-top:16px;background:transparent;border:0;box-shadow:none}
.level-picker-panel,.topic-list-panel{padding-top:14px;padding-bottom:40px}
@media(max-width:900px){.site-header{display:grid;grid-template-columns:minmax(0,1fr) auto}.site-header nav{grid-column:1 / -1;grid-row:2;min-width:0;width:100%;justify-content:flex-start;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;scrollbar-width:thin}.site-header nav a{flex:0 0 auto;white-space:nowrap}.admin-icon{grid-column:2;grid-row:1;margin-left:12px}}