@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,.24),transparent 34%),linear-gradient(145deg,#fffaf0,var(--card));box-shadow:0 18px 50px rgba(100,64,7,.09)}.legacy-content .lesson-header:after {content:"ACTOR";position:absolute;right:25px;bottom:-12px;font-size:90px;font-weight:900;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 .stack {padding:25px;border:1px solid var(--border);border-radius:20px;background:var(--card);box-shadow:var(--shadow-card)}.legacy-content .stack svg {display:block;width:100%;height:auto;min-height:270px}.legacy-content .loop-grid {display:grid;grid-template-columns:1fr 1fr;gap:16px}.legacy-content .panel, .legacy-content .code-card {padding:20px;border:1px solid var(--border);border-radius:16px;background:var(--card);box-shadow:var(--shadow-card)}.legacy-content .panel h3 {margin:0 0 10px;font-size:16px;color:var(--accent)}.legacy-content .panel ul {margin:0;padding-left:19px}.legacy-content .panel li {margin:8px 0;font-size:13px;line-height:1.6;color:var(--text)}.legacy-content .agent-fields {display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.legacy-content .field {padding:15px;border-radius:14px;background:linear-gradient(145deg,#fffaf0,var(--card));border:1px solid rgba(217,149,24,.22)}.legacy-content .field code {font-weight:800;color:var(--accent);font-size:11px}.legacy-content .field p {margin:7px 0 0;color:var(--sub);font-size:12px;line-height:1.55}.legacy-content .note {margin-top:12px;padding:14px 17px;border-radius:10px;background:var(--soft);font-size:13px;line-height:1.7}.legacy-content .source-grid {display:grid;grid-template-columns:1fr 1fr;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 .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:54px}.legacy-content .loop-grid, .legacy-content .source-grid {grid-template-columns:1fr}.legacy-content .agent-fields {grid-template-columns:1fr 1fr}.legacy-content .stack {padding:10px;overflow:auto}.legacy-content .stack svg {min-width:700px}}@media(max-width:430px){.legacy-content .agent-fields {grid-template-columns:1fr}}