@keyframes _si{from{opacity:0}to{opacity:1}}

.legacy-content .qa-answer {
  background: linear-gradient(135deg, rgba(8,145,178,0.06), rgba(0,102,255,0.05));
  border: 1.5px solid rgba(8,145,178,0.3);
  border-radius: var(--radius); padding: 22px 26px; margin: 4px 0 8px;
}.legacy-content .qa-answer .qa-tag { font-size: 11px; font-weight: 800; letter-spacing: 1px; color: #0891b2; margin-bottom: 8px; }.legacy-content .qa-answer p { font-size: 16.5px; font-weight: 700; color: var(--text); line-height: 1.85; }.legacy-content .qa-answer p b { color: #0891b2; }.legacy-content .layer-stack { display: flex; flex-direction: column; gap: 12px; }.legacy-content .layer-card {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow-card);
  position: relative;
}.legacy-content .layer-card .ly-icon {
  width: 48px; height: 48px; border-radius: 14px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 24px;
}.legacy-content .layer-card.l-model .ly-icon { background: rgba(0,102,255,0.08); }.legacy-content .layer-card.l-agent .ly-icon { background: rgba(124,58,237,0.08); }.legacy-content .layer-card.l-app .ly-icon { background: rgba(22,163,74,0.08); }.legacy-content .layer-card .ly-tag { font-size: 11px; font-weight: 800; letter-spacing: 0.5px; margin-bottom: 4px; }.legacy-content .layer-card.l-model .ly-tag { color: var(--accent); }.legacy-content .layer-card.l-agent .ly-tag { color: #7c3aed; }.legacy-content .layer-card.l-app .ly-tag { color: var(--success); }.legacy-content .layer-card h4 { font-size: 16.5px; font-weight: 800; color: var(--text); margin-bottom: 5px; }.legacy-content .layer-card p { font-size: 13.5px; color: var(--sub); line-height: 1.9; }.legacy-content .layer-card p b { color: var(--text); }.legacy-content .layer-arrow { text-align: center; font-size: 18px; color: var(--sub); line-height: 1; margin: -2px 0; }.legacy-content .sort-game {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  padding: 22px 24px;
}.legacy-content .sg-item { margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px dashed var(--border); }.legacy-content .sg-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }.legacy-content .sg-q { font-size: 15px; font-weight: 800; color: var(--text); margin-bottom: 10px; line-height: 1.6; }.legacy-content .sg-btns { display: flex; gap: 8px; flex-wrap: wrap; }.legacy-content .sg-btn {
  border: 1.5px solid var(--border); background: var(--card);
  border-radius: 999px; padding: 7px 18px; font-size: 13px; font-weight: 700;
  color: var(--sub); cursor: pointer; font-family: inherit; transition: all 0.15s;
}.legacy-content .sg-btn:hover:not(:disabled) { border-color: rgba(0,102,255,0.45); color: var(--accent); }.legacy-content .sg-btn:disabled { cursor: default; opacity: 0.55; }.legacy-content .sg-btn.right { background: rgba(22,163,74,0.1); border-color: var(--success); color: var(--success); opacity: 1; }.legacy-content .sg-btn.wrong { background: rgba(220,38,38,0.06); border-color: var(--danger); color: var(--danger); opacity: 1; }.legacy-content .sg-fb {
  margin-top: 10px; font-size: 13px; line-height: 1.8; color: var(--sub);
  display: none; animation: sgIn 0.3s ease;
}.legacy-content .sg-fb.show { display: block; }.legacy-content .sg-fb b { color: var(--accent); }@keyframes sgIn{ from { opacity: 0; transform: translateY(4px); } }.legacy-content .takeaway-box {
  background: linear-gradient(135deg, #eff6ff, #eef2ff);
  border: 1.5px solid #bfdbfe; border-radius: var(--radius);
  padding: 24px 28px; margin-top: 36px;
}.legacy-content .takeaway-box h3 { font-size: 17px; font-weight: 800; color: #1e40af; margin-bottom: 10px; }.legacy-content .takeaway-box ul { list-style: none; padding: 0; margin: 0; }.legacy-content .takeaway-box li {
  font-size: 14.5px; color: #1e3a5f; line-height: 1.8;
  padding: 4px 0 4px 22px; position: relative;
}.legacy-content .takeaway-box li::before {
  content: ''; position: absolute; left: 0; top: 13px;
  width: 8px; height: 8px; border-radius: 50%; background: #3b82f6;
}@media (max-width: 768px){.legacy-content .qa-answer p { font-size: 15px; }.legacy-content .layer-card { flex-direction: column; gap: 10px; }}