@keyframes _si{to{opacity:1}}.legacy-content .lesson-header h1 em {font-style:normal;color:var(--cyan)}.legacy-content .scene-row {display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.legacy-content .scene-chip {padding:9px 16px;border-radius:20px;border:1.5px solid var(--border);background:var(--surface);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;color:var(--sub);font-family:inherit}.legacy-content .scene-chip.active {background:var(--tips-accent);border-color:var(--tips-accent);color:white}.legacy-content .scene-chip:hover:not(.active) {border-color:var(--tips-accent);color:var(--tips-accent)}.legacy-content .compare {display:grid;grid-template-columns:1fr 1fr;gap:14px}.legacy-content .cmp-col {border-radius:14px;padding:14px 16px;display:flex;flex-direction:column;gap:8px;border:2px solid}.legacy-content .cmp-bad {background:rgba(220,38,38,.03);border-color:rgba(220,38,38,.2)}.legacy-content .cmp-good {background:rgba(22,163,74,.03);border-color:rgba(22,163,74,.2)}.legacy-content .cmp-label {font-size:12px;font-weight:800;letter-spacing:.4px}.legacy-content .cmp-bad .cmp-label {color:var(--red)}.legacy-content .cmp-good .cmp-label {color:var(--green)}.legacy-content .msg-bubble {border-radius:10px;padding:11px 13px;font-size:14px;line-height:1.65}.legacy-content .msg-user-bad {background:rgba(220,38,38,.08);color:#7c2d12}.legacy-content .msg-user-good {background:rgba(22,163,74,.08);color:#14532d}.legacy-content .msg-ai {background:var(--surface);border:1px solid var(--border);color:var(--text)}.legacy-content .msg-lbl {font-size:10px;font-weight:800;opacity:.6;margin-bottom:4px;letter-spacing:.3px}.legacy-content .msg-ai .highlight {background:rgba(8,145,178,.1);padding:1px 4px;border-radius:3px;font-weight:700;color:#0e7490}.legacy-content .diff-tag {display:inline-flex;align-items:center;gap:4px;padding:4px 10px;border-radius:6px;font-size:11px;font-weight:700;width:fit-content}.legacy-content .diff-bad {background:rgba(220,38,38,.1);color:var(--red)}.legacy-content .diff-good {background:rgba(22,163,74,.1);color:var(--green)}.legacy-content .insight {background:rgba(8,145,178,.06);border:1.5px solid rgba(8,145,178,.2);border-radius:12px;padding:14px 16px;display:flex;gap:10px;align-items:flex-start;margin-top:16px}.legacy-content .insight-icon {font-size:18px;flex-shrink:0}.legacy-content .insight-text {font-size:14px;color:var(--sub);line-height:1.7}.legacy-content .insight-text strong {color:var(--text)}.legacy-content .insight-text em {font-style:normal;color:var(--tips-accent);font-weight:700}@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.legacy-content .fade-in {animation:fadeIn .3s ease forwards}@media (max-width:768px){.legacy-content .compare {grid-template-columns:1fr}}

.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)}