@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 .vid-box {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  padding: 24px 26px;
}.legacy-content .vid-label { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }.legacy-content .vid-label span { font-size: 13px; font-weight: 700; color: var(--sub); }.legacy-content .vid-label b { font-size: 17px; color: var(--accent); font-variant-numeric: tabular-nums; }.legacy-content .vid-box input[type="range"] { width: 100%; accent-color: var(--accent); cursor: pointer; }.legacy-content .frame-strip {
  margin-top: 18px; display: flex; flex-wrap: wrap; gap: 3px;
  min-height: 40px;
}.legacy-content .frame-cell {
  width: 16px; height: 22px; border-radius: 3px;
  background: rgba(0,102,255,0.25); border: 1px solid rgba(0,102,255,0.35);
  animation: fIn 0.25s ease;
}@keyframes fIn{ from { opacity: 0; transform: scale(0.6); } }.legacy-content .vid-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; }.legacy-content .vid-cell {
  background: rgba(0,102,255,0.04); border: 1px solid rgba(0,102,255,0.12);
  border-radius: var(--radius-sm); padding: 13px 14px; text-align: center;
}.legacy-content .vid-cell .vc-num { font-size: 22px; font-weight: 900; color: var(--accent); font-variant-numeric: tabular-nums; }.legacy-content .vid-cell .vc-desc { font-size: 11.5px; color: var(--sub); margin-top: 3px; line-height: 1.5; }.legacy-content .vid-note { margin-top: 14px; font-size: 12.5px; color: var(--sub); line-height: 1.8; }.legacy-content .vid-note b { color: var(--text); }.legacy-content .hard-list { display: flex; flex-direction: column; gap: 12px; }.legacy-content .hard-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow-card);
}.legacy-content .hard-item .hd-icon { font-size: 24px; flex-shrink: 0; margin-top: 2px; }.legacy-content .hard-item h4 { font-size: 15px; font-weight: 800; color: var(--text); margin-bottom: 4px; }.legacy-content .hard-item p { font-size: 13px; color: var(--sub); line-height: 1.85; }.legacy-content .hard-item p b { color: var(--text); }.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 .vid-stats { grid-template-columns: 1fr; }.legacy-content .frame-cell { width: 12px; height: 17px; }}