.dns-hierarchy-app{padding:20px}
.dns-title,.dns-drag-title{margin-bottom:14px}
.dns-title h3,.dns-drag-title h3{margin:0 0 6px 0}
.dns-title p,.dns-drag-title p{margin:0;color:var(--text-secondary,#94a3b8)}
.dns-visual-with-labels{display:block}
.dns-side-labels{display:grid;gap:16px;align-content:start}
.dns-side-labels .side-label{color:var(--text-primary,#e2e8f0);padding:10px 12px;border-radius:8px;font-weight:600;background:rgba(15,23,42,.35);backdrop-filter:blur(2px);border:1px solid rgba(148,163,184,.18)}
.dns-side-labels .dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:8px;vertical-align:middle}
.dns-side-labels .dot.child{background:#60a5fa}
.dns-side-labels .dot.parent{background:#38bdf8}
.dns-side-labels .dot.tld{background:#22d3ee}
.dns-visual{--row-offset-tld:-133px;--row-offset-parent:-133px;--row-offset-child:-133px;--row-gap:18px;text-align:center;background:var(--bg-secondary,#0b1220);border:1px solid var(--border-color,rgba(148,163,184,.18));border-radius:14px;padding:18px;width:100%}
.dns-visual-inner{display:flex;flex-direction:column;gap:0}
.root-row{display:flex;justify-content:center}
.dns-row-block{display:grid;grid-template-columns:260px 1fr;gap:16px;align-items:center}
.dns-visual-inner .dns-row-block:not(:first-of-type){border-top:1px solid rgba(148,163,184,.22);padding-top:6px;margin-top:6px}
.row-tld .nodes-tld{transform:translateX(var(--row-offset-tld))}
.row-parent .nodes-parent{transform:translateX(var(--row-offset-parent))}
.row-child .nodes-child{transform:translateX(var(--row-offset-child))}
.dns-visual-with-labels{margin-bottom:28px}
.dns-node{display:inline-block;background:#1e3a8a;color:#fff;padding:10px 14px;border-radius:8px;margin:8px;min-width:120px;font-weight:600}
.dns-node.root{background:#0ea5e9}
.dns-node.tld{background:#0284c7}
.dns-node.parent{background:#2563eb}
.dns-node.child{background:#3b82f6}
.dns-branch{height:18px;border-left:2px dashed rgba(148,163,184,.4);width:2px;margin:0 auto}
.dns-branch.center{margin:0 auto 8px auto}
/* .center-line removed per user request */
.dns-row{display:flex;justify-content:center;flex-wrap:wrap}
.dns-drag-grid{display:grid;grid-template-columns:300px 1fr;gap:14px;margin-top:20px;margin-bottom:36px}
.drag-terms{background:var(--bg-secondary,#0f172a);padding:14px;border-radius:14px;border:1px solid rgba(148,163,184,.15);width:1144px}
#drag-terms{height:470px;overflow:auto}
.drag-term{background:#0ea5e9;color:#fff;padding:10px 12px;border-radius:10px;margin:10px 0;cursor:grab;text-align:center;font-weight:700;box-shadow:0 1px 2px rgba(0,0,0,.15);width:200px}
.drag-term:hover{filter:brightness(.95)}
.drag-actions{display:flex;gap:12px;margin-top:16px}
.drop-defs{display:flex;flex-direction:column;row-gap:0}
.drop-defs .drop-zone{margin-top:6px}
.drop-defs .drop-zone:first-child{margin-top:20px}
.drop-zone{background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:var(--radius-md);padding:0.9rem;transition:all .3s ease;max-height:50px;min-height:50px;margin:0;width:70%}
.drop-zone .assigned{display:inline-block;background:#16a34a;color:#fff;padding:4px 8px;border-radius:6px;margin-left:8px;font-weight:700}
.drop-zone.over{border-color:#38bdf8;background:rgba(56,189,248,.06)}
.drop-zone.correct{border-color:#22c55e}
.drop-zone.wrong{border-color:#ef4444}
.dns-feedback{margin-top:10px;font-weight:700}

/* Buttons inside DNS app (reusing control-btn semantics) */
.dns-hierarchy-app .control-btn{background:var(--primary-color,#2563eb);color:#fff;border:1px solid var(--primary-color,#2563eb);border-radius:10px;padding:.55rem .9rem;font-weight:600;cursor:pointer}
.dns-hierarchy-app .control-btn:hover{filter:brightness(.95)}
.dns-hierarchy-app .control-btn:active{transform:translateY(1px)}

/* Extra spacing for Lerninhalte */
.dns-hierarchy-app .learning-content{margin-top:26px}
.dns-hierarchy-app .learning-sections{gap:18px}

/* DNS Drag section styled like OSI module */
.dns-drag-container{max-width:100%;margin:0 auto}
.dns-drag-panel{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:1.2rem 1.4rem;border:1px solid var(--border-color);margin-top: 20px;}
.dns-drag-drop{display:grid;grid-template-columns:300px 1fr;gap:18px}
.dns-controls{display:flex;flex-direction:column;gap:14px;margin-top:14px}
.dns-controls-buttons{display:flex;gap:10px;justify-content:flex-start;flex-wrap:wrap}
.dns-controls .exercise-statistics{margin-top:0;width:100%}
.dns-drag-title h3{margin:0 0 .5rem 0}
.dns-drag-title p{margin:.25rem 0 1rem 0;color:var(--text-secondary)}

/* DNS hierarchy-specific overrides */
.dns-hierarchy-app .drop-zone{padding:.8rem !important}

@media (max-width: 920px){
  .dns-visual-with-labels{grid-template-columns:1fr}
  .dns-drag-grid{grid-template-columns:1fr;gap:16px}
}