@keyframes _si{to{opacity:1}}

.legacy-content .lesson-header {position:relative;overflow:hidden}.legacy-content .lesson-header:after {content:"";position:absolute;right:-70px;top:-70px;width:220px;height:220px;border:1px solid rgba(217,149,22,.22);border-radius:50%;box-shadow:0 0 0 26px rgba(217,149,22,.04),0 0 0 52px rgba(217,149,22,.025)}.legacy-content .objective {display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center;background:linear-gradient(135deg,var(--amber-soft),rgba(255,255,255,.75));border:1px solid rgba(217,149,22,.28);border-radius:var(--radius);padding:18px 20px;margin:18px 0 28px}.legacy-content .objective svg {color:var(--accent)}.legacy-content .objective b {display:block;color:var(--accent);margin-bottom:4px}.legacy-content .objective span {font-size:14px;line-height:1.7;color:var(--text)}.legacy-content .registry-visual {background:var(--surface-soft);border:1px solid #5d4317;border-radius:18px;padding:24px;box-shadow:0 18px 50px rgba(77,50,7,.18);color:var(--muted)}.legacy-content .registry-visual svg {width:100%;height:auto;display:block}.legacy-content .visual-caption {font-size:12px;color:var(--muted);text-align:center;margin-top:10px}.legacy-content .facts {display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:14px}.legacy-content .fact {background:var(--card);border:1px solid var(--border);border-radius:12px;padding:17px;box-shadow:var(--shadow-card)}.legacy-content .fact code {color:var(--accent);font-weight:800}.legacy-content .fact p {font-size:13px;line-height:1.7;color:var(--sub);margin:7px 0 0}.legacy-content .timing {display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:stretch}.legacy-content .time-card {background:var(--card);border:1px solid var(--border);border-radius:14px;padding:19px}.legacy-content .time-card strong {color:var(--accent)}.legacy-content .time-card p {font-size:13px;line-height:1.7;color:var(--sub);margin:7px 0 0}.legacy-content .time-arrow {display:flex;align-items:center;color:var(--accent)}.legacy-content .source {background:var(--surface-soft);border:1px solid #4d3816;border-radius:14px;overflow:hidden;margin-top:12px}.legacy-content .source-head {display:flex;justify-content:space-between;gap:12px;padding:10px 16px;background:var(--surface-soft);color:var(--muted);font:12px ui-monospace,SFMono-Regular,Menlo,monospace}.legacy-content .source pre {margin:0;padding:18px;overflow:auto}.legacy-content .source code {color:var(--muted);font:12.5px/1.68 ui-monospace,SFMono-Regular,Menlo,monospace}.legacy-content .kw {color:#f4b942}.legacy-content .ty {color:var(--muted)}.legacy-content .fn {color:#e8a92f}.legacy-content .cm {color:#968970}.legacy-content .exercise {display:grid;grid-template-columns:52px 1fr;gap:16px;background:linear-gradient(135deg,#fff8e9,var(--card));border:1px solid rgba(217,149,22,.3);border-radius:14px;padding:20px}.legacy-content .exercise-num {width:46px;height:46px;border-radius:12px;background:var(--accent);color:white;display:grid;place-items:center;font-weight:900}.legacy-content .exercise h3 {margin:0 0 7px;color:var(--text);font-size:16px}.legacy-content .exercise p {margin:0;color:var(--sub);font-size:13px;line-height:1.75}.legacy-content .snapshot {margin-top:14px;padding:13px 16px;border:1px solid var(--border);border-radius:8px;background:var(--bg);font-size:12px;line-height:1.7;color:var(--sub)}.legacy-content .snapshot code {color:var(--text)}.legacy-content .takeaway {margin-top:22px;padding:19px 22px;border-radius:14px;background:var(--surface-soft);color:var(--muted);display:flex;gap:13px;line-height:1.75}.legacy-content .takeaway svg {flex:0 0 auto;color:var(--gold)}.legacy-content .takeaway b {color:var(--gold)}@media(max-width:760px){.legacy-content .facts {grid-template-columns:1fr}.legacy-content .timing {grid-template-columns:1fr}.legacy-content .time-arrow {justify-content:center;transform:rotate(90deg)}.legacy-content .source-head {flex-direction:column}.legacy-content .registry-visual {padding:12px}.legacy-content .objective {grid-template-columns:1fr}.legacy-content .lesson-header:after {display: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)}