.legacy-content .lesson-header h1 .em { color: var(--accent); }.legacy-content .divider {
  border: none; height: 1px;
  background: var(--border);
  margin: 36px 0;
}.legacy-content .step-card {
  border-radius: var(--radius-sm); padding: 18px 20px;
  border: 1px solid var(--border);
  background: var(--card);
  margin-bottom: 20px;
}.legacy-content .step-card .num {
  font-size: 11px; font-weight: 800; color: var(--accent);
  letter-spacing: 0.4px; margin-bottom: 6px;
}.legacy-content .step-card .content {
  font-size: 15px; color: var(--text); line-height: 1.75;
}.legacy-content .demo-section {
  margin-top: 8px;
  margin-bottom: 20px;
}.legacy-content .section-label {
  font-size: 12px; font-weight: 700; color: var(--sub);
  letter-spacing: 0.4px; text-transform: uppercase;
  margin-bottom: 14px;
}.legacy-content .chat-demo {
  background: var(--card); border-radius: var(--radius); padding: 22px 24px;
  border: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}.legacy-content .btn-replay {
  position: absolute; top: 10px; right: 12px;
  background: var(--card); color: var(--sub); border: 1px solid rgba(0,0,0,0.12);
  padding: 4px 12px; border-radius: 999px;
  font-size: 12px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; font-family: inherit; z-index: 2;
}.legacy-content .btn-replay:hover { background: rgba(0,0,0,0.05); color: var(--text); }.legacy-content .raw-text-box {
  background: rgba(0,0,0,0.03); border-radius: var(--radius-sm); padding: 16px 18px;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 14px; line-height: 1.85; color: var(--text);
  opacity: 0; transform: translateY(4px);
  transition: all 0.4s;
}.legacy-content .raw-text-box.show { opacity: 1; transform: translateY(0); }.legacy-content .rt-user { color: var(--accent); font-weight: 700; }.legacy-content .rt-ai { color: var(--success); font-weight: 700; }.legacy-content .arrow-label {
  text-align: center; font-size: 13px; font-weight: 700; color: var(--sub);
  opacity: 0; transition: opacity 0.4s;
}.legacy-content .arrow-label.show { opacity: 1; }.legacy-content .typing-output {
  background: rgba(22,163,74,0.05); border: 1px solid rgba(22,163,74,0.15);
  border-radius: var(--radius-sm); padding: 16px 18px;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 14px; line-height: 1.85;
  opacity: 0; transition: opacity 0.4s;
  min-height: 52px;
}.legacy-content .typing-output.show { opacity: 1; }.legacy-content .cursor-blink {
  display: inline-block; width: 2px; height: 1em;
  background: var(--success); vertical-align: text-bottom;
  animation: blink 0.9s step-start infinite;
}@keyframes blink{ 50% { opacity: 0; } }.legacy-content .round2-label {
  font-size: 12px; font-weight: 700; color: var(--sub);
  letter-spacing: 0.3px; margin-top: 4px;
  opacity: 0; transition: opacity 0.4s;
}.legacy-content .round2-label.show { opacity: 1; }.legacy-content .next-prompt-box {
  background: rgba(0,0,0,0.03); border-radius: var(--radius-sm); padding: 16px 18px;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 14px; line-height: 1.85;
  opacity: 0; transform: translateY(4px);
  transition: all 0.4s;
}.legacy-content .next-prompt-box.show { opacity: 1; transform: translateY(0); }.legacy-content .next-prompt-box .rt-ai { color: var(--success); font-weight: 700; }.legacy-content .next-prompt-box .rt-user { color: var(--accent); font-weight: 700; }.legacy-content .next-prompt-box .incomplete { color: var(--danger); font-style: italic; }.legacy-content .wow-badge {
  background: rgba(217,119,6,0.08); border: 1px solid rgba(217,119,6,0.2);
  border-radius: var(--radius); padding: 20px 24px;
  font-size: 19px; font-weight: 800; color: var(--amber);
  text-align: center;
  opacity: 0; transition: opacity 0.5s;
  margin-top: 12px;
}.legacy-content .wow-badge.show { opacity: 1; }.legacy-content .caveat {
  background: rgba(220,38,38,0.04); border: 1px solid rgba(220,38,38,0.18);
  border-radius: var(--radius); padding: 18px 22px; margin-top: 14px;
}.legacy-content .caveat-t {
  font-size: 15px; font-weight: 800; color: var(--danger);
  margin-bottom: 8px;
}.legacy-content .caveat p { margin: 0 0 8px; font-size: 14px; line-height: 1.85; color: var(--text); }.legacy-content .caveat p:last-child { margin-bottom: 0; }@media (max-width: 768px){.legacy-content .step-card { padding: 14px 16px; }.legacy-content .step-card .content { font-size: 14px; }.legacy-content .chat-demo { padding: 16px 14px; gap: 12px; }.legacy-content .raw-text-box, .legacy-content .typing-output, .legacy-content .next-prompt-box { padding: 12px 14px; font-size: 13px; line-height: 1.75; }.legacy-content .wow-badge { font-size: 16px; padding: 16px 18px; }.legacy-content .divider { margin: 28px 0; }}

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

.legacy-content .xa-tldr {margin:18px 0 4px;padding:14px 18px;background:rgba(0,102,255,0.04);border:1px solid rgba(0,102,255,0.16);border-radius:10px}.legacy-content .xa-tldr .xa-tldr-tag {display:block;font-size:11px;font-weight:800;letter-spacing:1px;color:var(--accent,#0066ff);margin-bottom:6px}.legacy-content .xa-tldr p {margin:0;font-size:15px;line-height:1.8;color:var(--text,#1f2937)}