@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 .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 .tbl {width:100%;border-collapse:collapse;margin-top:14px;font-size:13.5px;background:var(--card);border-radius:12px;overflow:hidden;box-shadow:var(--shadow-card)}.legacy-content .tbl th {background:var(--ct-soft);color:var(--ct-deep);font-weight:800;text-align:left;padding:11px 14px;font-size:13px}.legacy-content .tbl td {padding:11px 14px;border-top:1px solid var(--border);color:var(--sub);line-height:1.65;vertical-align:top}.legacy-content .tbl td b {color:var(--ct-deep)}.legacy-content .tbl td.hi {color:var(--warn);font-weight:800}.legacy-content .tbl-wrap {overflow-x:auto}.legacy-content .lad {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 .lad-row {display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:6px}.legacy-content .lad-row label {font-size:14px;font-weight:700;color:var(--text);min-width:120px}.legacy-content .lad-row input[type=range] {flex:1;min-width:180px;accent-color:var(--ct)}.legacy-content .lad-row .val {font-size:15px;font-weight:800;min-width:110px;text-align:right;font-variant-numeric:tabular-nums;color:var(--ct-deep)}.legacy-content .lad-row .val.hot {color:var(--warn)}.legacy-content .lad-scale {position:relative;height:8px;border-radius:4px;margin:6px 2px 4px;opacity:.3;background:linear-gradient(to right,var(--ct) 0 16%,#f59e0b 16% 51%,var(--warn) 51% 100%)}.legacy-content .lad-mark {display:flex;font-size:11.5px;color:var(--sub);margin-bottom:12px;position:relative;height:16px}.legacy-content .lad-mark span {position:absolute;transform:translateX(-50%)}.legacy-content .lad-out {display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:12px}.legacy-content .lo {background:rgba(0,0,0,.03);border-radius:10px;padding:12px 14px;text-align:center}.legacy-content .lo .k {font-size:12px;color:var(--sub);margin-bottom:4px}.legacy-content .lo .v {font-size:17px;font-weight:800;color:var(--ct-deep);font-variant-numeric:tabular-nums}.legacy-content .lo.hot .v {color:var(--warn)}.legacy-content .lad-note {margin-top:12px;font-size:14px;line-height:1.78;color:var(--text);background:rgba(0,0,0,.03);border-radius:10px;padding:12px 16px}.legacy-content .lad-note b {color:var(--ct-deep)}.legacy-content .lad-note.bad b {color:var(--warn)}.legacy-content .codebox {margin-top:12px;background:#eef3e9;color:#52685d;border:1px solid #d9e0d3;border-radius:12px;padding:16px 18px;font-size:13px;line-height:1.7;overflow-x:auto;white-space:pre;font-family:"SF Mono","Fira Code",Menlo,monospace}.legacy-content .codebox .c {color:#64748b}.legacy-content .codebox .g {color:#4ade80}.legacy-content .codebox .r {color:#f87171}.legacy-content .code-tag {display:inline-block;margin-top:14px;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:800}.legacy-content .code-tag.bad {background:var(--warn-soft);color:var(--warn)}.legacy-content .code-tag.good {background:var(--ct-soft);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 .lad-out {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)}