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

.legacy-content .lesson-header .kicker {color:var(--vibe)}.legacy-content .desc {font-size:16px;color:var(--sub);line-height:1.8}.legacy-content .ent-wrap {background:var(--card);border:1.5px solid var(--border);border-radius:14px;overflow:hidden;margin-top:12px}.legacy-content .ent-stage {padding:18px 20px;min-height:150px;background:repeating-conic-gradient(rgba(0,0,0,.025) 0% 25%, transparent 0% 50%) 0 0 / 22px 22px}.legacy-content .ent-row {display:flex;flex-wrap:wrap;gap:12px;align-items:flex-start}.legacy-content .ent-item {animation:entIn .28s ease}@keyframes entIn{from{opacity:0;transform:translateY(6px) scale(.96)}to{opacity:1;transform:none}}.legacy-content .ent-item button {border:none;color:#fff;font-family:inherit;font-weight:700;cursor:default;display:block}.legacy-content .ent-cls {display:block;margin-top:5px;font-family:"SF Mono",Menlo,monospace;font-size:11.5px;color:var(--sub);text-align:center}.legacy-content .ent-empty {font-size:14px;color:var(--sub);line-height:1.7}.legacy-content .ent-log {border-top:1px solid var(--border);padding:12px 20px;background:rgba(0,0,0,.02);font-size:13.5px;color:var(--sub);line-height:1.7;min-height:44px}.legacy-content .ent-log b {color:var(--text)}.legacy-content .ent-stats {display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--border)}.legacy-content .ent-stat {padding:12px 8px;text-align:center;border-right:1px solid var(--border)}.legacy-content .ent-stat:last-child {border-right:none}.legacy-content .ent-stat .n {display:block;font-size:24px;font-weight:800;color:var(--vibe);font-variant-numeric:tabular-nums;transition:color .2s}.legacy-content .ent-stat.hot .n {color:var(--danger)}.legacy-content .ent-stat .k {font-size:12px;color:var(--sub)}.legacy-content .ent-btns {display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.legacy-content .ent-btns button {padding:12px 22px;border-radius:10px;border:1.5px solid var(--border);background:var(--card);font-size:14.5px;font-weight:700;color:var(--text);cursor:pointer;font-family:inherit;min-height:44px;transition:all .15s}.legacy-content .ent-btns button.pri {background:var(--vibe);border-color:var(--vibe);color:#fff}.legacy-content .ent-btns button.pri:hover {filter:brightness(1.08)}.legacy-content .ent-btns button:disabled {opacity:.42;cursor:default}.legacy-content .ent-token {margin-top:14px;padding:14px 18px;border-radius:12px;background:var(--surface-soft);color:var(--muted);font-family:"SF Mono",Menlo,monospace;font-size:12.5px;line-height:1.75;white-space:pre;overflow-x:auto;display:none}.legacy-content .ent-token.on {display:block}.legacy-content .why-grid {display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-top:12px}.legacy-content .why-grid .l-card h3 {font-size:16px;margin-bottom:4px}.legacy-content .why-grid .l-card p {font-size:14px;color:var(--sub);line-height:1.7}.legacy-content .why-tag {display:inline-block;font-size:12px;font-weight:800;letter-spacing:.5px;color:var(--vibe);background:rgba(13,148,136,.1);border-radius:6px;padding:3px 10px;margin-bottom:8px}.legacy-content .jd-card {background:var(--card);border:1.5px solid var(--border);border-radius:14px;padding:16px 20px;margin-top:12px}.legacy-content .jd-pair {display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}.legacy-content .jd-side {border:1.5px solid var(--border);border-radius:11px;padding:12px 14px;background:rgba(0,0,0,.015)}.legacy-content .jd-side .nm {font-family:"SF Mono",Menlo,monospace;font-size:12.5px;font-weight:700;color:var(--vibe-deep);display:block;margin-bottom:5px}.legacy-content .jd-side .vl {font-size:13.5px;color:var(--sub);line-height:1.65}.legacy-content .jd-ask {font-size:15px;font-weight:700;color:var(--text);line-height:1.6;margin-bottom:10px}.legacy-content .jd-opts {display:flex;gap:8px;flex-wrap:wrap}.legacy-content .jd-opts button {flex:1;min-width:150px;padding:12px 16px;border-radius:10px;border:1.5px solid var(--border);background:var(--card);font-size:14.5px;font-weight:700;color:var(--text);cursor:pointer;font-family:inherit;min-height:44px;transition:all .15s}.legacy-content .jd-opts button:hover:not(:disabled) {border-color:rgba(0,0,0,.2)}.legacy-content .jd-opts button.right {border-color:rgba(22,163,74,.5);background:rgba(22,163,74,.07);color:var(--success)}.legacy-content .jd-opts button.wrong {border-color:rgba(220,38,38,.4);background:rgba(220,38,38,.05);color:var(--danger)}.legacy-content .jd-opts button:disabled {cursor:default}.legacy-content .jd-fb {margin-top:11px;border-radius:10px;padding:12px 15px;font-size:14px;line-height:1.7;display:none}.legacy-content .jd-fb.on {display:block}.legacy-content .jd-fb.ok {background:rgba(22,163,74,.06);border:1.5px solid rgba(22,163,74,.3);color:var(--text)}.legacy-content .jd-fb.no {background:rgba(220,38,38,.05);border:1.5px solid rgba(220,38,38,.28);color:var(--text)}.legacy-content .jd-fb b.y {color:var(--success)}.legacy-content .jd-fb b.n {color:var(--danger)}.legacy-content .step-list {margin-top:12px;display:flex;flex-direction:column;gap:11px}.legacy-content .step-item {display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1.5px solid var(--border);border-radius:12px;padding:14px 18px}.legacy-content .step-n {flex-shrink:0;width:30px;height:30px;border-radius:9px;background:rgba(13,148,136,.1);color:var(--vibe);font-weight:800;font-size:15px;display:flex;align-items:center;justify-content:center}.legacy-content .step-item h3 {font-size:15.5px;margin:0 0 3px}.legacy-content .step-item p {font-size:14px;color:var(--sub);line-height:1.72;margin:0}.legacy-content code {color:var(--vibe-deep);background:rgba(13,148,136,.08)}.legacy-content .vibe-callout {background:rgba(13,148,136,.05);border:1.5px solid rgba(13,148,136,.25);border-radius:14px;padding:18px 22px}.legacy-content .vibe-callout b {color:var(--vibe)}.legacy-content .vibe-callout p {line-height:1.8}.legacy-content .src-note {margin-top:28px;font-size:13px;color:var(--sub)}.legacy-content .src-note a {color:var(--vibe-deep)}.legacy-content .ctrl-hint {font-size:13px;color:var(--sub);margin-top:10px}.legacy-content .xref {margin-top:14px;font-size:14.5px;color:var(--sub);line-height:1.8}.legacy-content .xref a {color:var(--vibe-deep);font-weight:700}@media (max-width:768px){.legacy-content .why-grid, .legacy-content .jd-pair {grid-template-columns:1fr}.legacy-content .ent-stats {grid-template-columns:1fr 1fr}.legacy-content .ent-stat:nth-child(2) {border-right:none}}

.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)}