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

.legacy-content .lesson-header .kicker {color:var(--ct)}.legacy-content .chips {display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.legacy-content .chip {padding:6px 14px;border-radius:999px;background:var(--ct-soft);color:var(--ct-deep);font-size:13px;font-weight:700}.legacy-content .desc {font-size:15px;color:var(--sub);line-height:1.8}.legacy-content .desc b, .legacy-content .quote-card b {color:var(--ct-deep)}.legacy-content .quote-card {background:var(--ct-soft);border:1.5px solid var(--ct-line);border-radius:14px;padding:18px 22px;font-size:16px;line-height:1.8}.legacy-content .sim {background:var(--card);border:1.5px solid var(--border);border-radius:14px;padding:20px 22px;margin-top:14px;box-shadow:var(--shadow-card)}.legacy-content .sim-row {display:flex;align-items:center;gap:14px;margin-bottom:10px;flex-wrap:wrap}.legacy-content .sim-row label {font-size:14px;font-weight:700;color:var(--text);min-width:150px}.legacy-content .sim-row input[type=range] {flex:1;min-width:160px;accent-color:var(--ct)}.legacy-content .sim-row .val {font-size:14px;font-weight:800;color:var(--ct-deep);min-width:90px;text-align:right;font-variant-numeric:tabular-nums}.legacy-content .sim-bars {display:flex;flex-direction:column;gap:12px;margin-top:16px}.legacy-content .sb {display:flex;align-items:center;gap:12px}.legacy-content .sb .sb-name {font-size:13px;font-weight:700;color:var(--sub);width:90px;flex-shrink:0}.legacy-content .sb .sb-track {flex:1;height:26px;background:rgba(0,0,0,.045);border-radius:8px;overflow:hidden;position:relative}.legacy-content .sb .sb-fill {height:100%;border-radius:8px;transition:width .25s ease;display:flex;align-items:center;justify-content:flex-end;padding-right:8px;font-size:12px;font-weight:800;color:#fff;min-width:36px}.legacy-content .sb.rev .sb-fill {background:#2563eb}.legacy-content .sb.cost .sb-fill {background:var(--warn)}.legacy-content .sb.profit .sb-fill {background:var(--ct)}.legacy-content .sb.profit.neg .sb-fill {background:#7f1d1d}.legacy-content .sim-verdict {margin-top:14px;font-size:14.5px;line-height:1.8;color:var(--text);background:rgba(0,0,0,.03);border-radius:10px;padding:12px 16px}.legacy-content .sim-verdict b {color:var(--ct-deep)}.legacy-content .sim-verdict.bad b {color:var(--warn)}.legacy-content .id-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}.legacy-content .idc {background:var(--card);border:1.5px solid var(--border);border-radius:13px;padding:16px 17px;box-shadow:var(--shadow-card)}.legacy-content .idc h4 {font-size:15px;font-weight:800;color:var(--ct-deep);margin-bottom:7px;display:flex;align-items:center;gap:8px}.legacy-content .idc h4 .ic {width:26px;height:26px;border-radius:8px;background:var(--ct-soft);display:inline-flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}.legacy-content .idc p {font-size:13.5px;color:var(--sub);line-height:1.72}.legacy-content .idc p b {color:var(--ct-deep)}.legacy-content .fig-wrap {margin-top:14px;background:var(--card);border:1.5px solid var(--border);border-radius:14px;padding:10px;box-shadow:var(--shadow-card)}.legacy-content .fig-wrap img {width:100%;border-radius:8px;display:block}.legacy-content .fig-cap {font-size:12.5px;color:var(--sub);padding:8px 6px 4px;line-height:1.6}.legacy-content .map {display:flex;flex-direction:column;gap:10px;margin-top:14px}.legacy-content .map-item {display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1.5px solid var(--border);border-radius:12px;padding:14px 17px;box-shadow:var(--shadow-card)}.legacy-content .map-num {width:30px;height:30px;border-radius:9px;background:var(--ct-soft);color:var(--ct-deep);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex-shrink:0;margin-top:2px}.legacy-content .map-item h5 {font-size:14.5px;font-weight:800;color:var(--text);margin-bottom:4px}.legacy-content .map-item p {font-size:13.5px;color:var(--sub);line-height:1.7;margin:0}.legacy-content .map-item p b {color:var(--ct-deep)}.legacy-content .takeaways {display:flex;flex-direction:column;gap:10px;margin-top:12px}.legacy-content .tk-item {display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1.5px solid var(--border);border-radius:12px;padding:14px 16px;box-shadow:var(--shadow-card)}.legacy-content .tk-ic {width:22px;height:22px;border-radius:7px;background:var(--ct-soft);color:var(--ct);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-weight:800;font-size:13px;margin-top:1px}.legacy-content .tk-item p {font-size:14px;line-height:1.75;color:var(--text);margin:0}.legacy-content .tk-item p b {color:var(--ct-deep)}.legacy-content .src-note {margin-top:28px;font-size:13px;color:var(--sub);line-height:1.85}.legacy-content .src-note b {color:var(--text)}@media (max-width:768px){.legacy-content .id-grid {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)}