@keyframes _si{to{opacity:1}}

.legacy-content .lesson-header {position:relative;overflow:hidden;padding:42px 38px;border:1px solid rgba(217,149,24,.24);border-radius:24px;background:radial-gradient(circle at 87% 8%,rgba(244,185,66,.26),transparent 34%),linear-gradient(145deg,#fffaf0,var(--card));box-shadow:0 18px 50px rgba(100,64,7,.09)}.legacy-content .lesson-header:after {content:"CTX";position:absolute;right:25px;bottom:-20px;font:900 130px/1 ui-monospace,monospace;color:rgba(217,149,24,.07)}.legacy-content .subtitle {max-width:770px;position:relative;z-index:1}.legacy-content .goal, .legacy-content .snapshot, .legacy-content .takeaway {margin-top:18px;border:1px solid rgba(217,149,24,.22);background:var(--soft);border-radius:16px;padding:16px 20px;line-height:1.7}.legacy-content .goal b, .legacy-content .snapshot b, .legacy-content .takeaway b {color:var(--accent)}.legacy-content .section-title {margin:34px 0 14px;font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--accent)}.legacy-content .flow {padding:24px;border:1px solid var(--border);border-radius:20px;background:var(--card);box-shadow:var(--shadow-card);overflow:auto}.legacy-content .flow svg {display:block;min-width:780px;width:100%;height:auto}.legacy-content .groups {display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.legacy-content .group, .legacy-content .code-card, .legacy-content .override {padding:19px;border:1px solid var(--border);border-radius:16px;background:var(--card);box-shadow:var(--shadow-card)}.legacy-content .group h3 {font-size:14px;margin:0 0 10px;color:var(--accent)}.legacy-content .chips {display:flex;flex-wrap:wrap;gap:7px}.legacy-content .chips code {padding:5px 8px;border-radius:7px;background:var(--soft);color:#76500d;font-size:10px}.legacy-content .overrides {display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.legacy-content .override span {font:800 12px ui-monospace,monospace;color:var(--accent)}.legacy-content .override h3 {font-size:16px;margin:9px 0 5px}.legacy-content .override p {font-size:12px;line-height:1.6;color:var(--sub);margin:0}.legacy-content .source-grid {display:grid;grid-template-columns:1.15fr .85fr;gap:16px}.legacy-content .path {font:700 11px/1.5 ui-monospace,monospace;color:var(--accent);overflow-wrap:anywhere}.legacy-content .code {margin-top:9px;padding:15px;border-radius:12px;background:var(--surface-soft);color:var(--muted);overflow:auto;font:12px/1.65 ui-monospace,monospace}.legacy-content .cm {color:#aa9570}.legacy-content .kw {color:#ffc85a}.legacy-content .ty {color:var(--muted)}.legacy-content .truth {padding:18px;border-radius:10px;background:var(--soft);font-size:13px;line-height:1.7}.legacy-content .truth code {color:#805307}.legacy-content .exercise {padding:20px;border:1px dashed rgba(217,149,24,.48);border-radius:18px;background:linear-gradient(120deg,var(--soft),transparent)}.legacy-content .exercise h3 {margin:0 0 6px}.legacy-content .exercise p {margin:0;color:var(--sub);line-height:1.7}.legacy-content .takeaway {display:flex;gap:12px}.legacy-content .takeaway svg {width:26px;flex:none;color:var(--accent)}@media(max-width:760px){.legacy-content .lesson-header {padding:30px 22px}.legacy-content .lesson-header:after {font-size:82px}.legacy-content .groups, .legacy-content .overrides, .legacy-content .source-grid {grid-template-columns:1fr}.legacy-content .flow {padding:10px}}

.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)}