@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(77,107,254,.22);border-radius:50%;box-shadow:0 0 0 26px rgba(77,107,254,.04),0 0 0 52px rgba(77,107,254,.025)}.legacy-content .sec-label {margin:56px 0 20px}.legacy-content .objective {display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center;background:linear-gradient(135deg,var(--accent-soft),rgba(255,255,255,.75));border:1px solid rgba(77,107,254,.28);border-radius:var(--radius);padding:24px;margin:24px 0 32px}.legacy-content .objective svg {color:var(--accent)}.legacy-content .objective b {display:block;color:var(--accent);margin-bottom:6px}.legacy-content .objective span {font-size:14px;line-height:1.9;color:var(--text)}.legacy-content .facts {display:grid;grid-template-columns:1fr;gap:20px;margin-top:20px}.legacy-content .fact {background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px;box-shadow:var(--shadow-card)}.legacy-content .fact code {color:var(--accent);font-weight:800}.legacy-content .fact p {font-size:14px;line-height:1.9;color:var(--sub);margin:10px 0 0}.legacy-content .struct {background:var(--card);border:1px solid rgba(77,107,254,.25);border-radius:16px;padding:24px;box-shadow:var(--shadow-card)}.legacy-content .struct svg {width:100%;height:auto;display:block}.legacy-content .struct-caption {font-size:12px;color:var(--sub);text-align:center;margin-top:10px}.legacy-content .source {background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;margin-top:12px;box-shadow:var(--shadow-card)}.legacy-content .source-head {display:flex;justify-content:space-between;gap:12px;padding:10px 16px;background:var(--accent-soft);color:var(--accent-deep);font:12px ui-monospace,SFMono-Regular,Menlo,monospace}.legacy-content .source pre {margin:0;padding:18px;overflow:auto}.legacy-content .source code {color:var(--text);font:12.5px/1.68 ui-monospace,SFMono-Regular,Menlo,monospace;background:none;padding:0}.legacy-content .kw {color:#3450d4}.legacy-content .ty {color:#7c3aed}.legacy-content .fn {color:#0891b2}.legacy-content .cm {color:#9ca3af}.legacy-content .str {color:#16a34a}.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 .exercise {display:grid;grid-template-columns:52px 1fr;gap:18px;background:linear-gradient(135deg,#f0f3ff,var(--card));border:1px solid rgba(77,107,254,.3);border-radius:14px;padding:24px;margin-top:16px}.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 10px;color:var(--text);font-size:16px}.legacy-content .exercise p {margin:0;color:var(--sub);font-size:14px;line-height:1.9}.legacy-content .takeaway {margin-top:32px;padding:24px;border-radius:14px;background:var(--accent-soft);border:1px solid rgba(77,107,254,.28);color:var(--text);display:flex;gap:14px;line-height:1.9}.legacy-content .takeaway svg {flex:0 0 auto;color:var(--accent)}.legacy-content .takeaway b {color:var(--accent-deep)}.legacy-content p.body {font-size:15px;line-height:2;color:var(--text);margin:0 0 20px}.legacy-content .src-note {font-size:12.5px;color:var(--sub);line-height:1.8;margin:-8px 0 20px}.legacy-content .src-note code {font-size:11.5px}.legacy-content .brand-i {flex:none;line-height:1;vertical-align:-2px;margin-right:6px}.legacy-content #demo-subagent {background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);margin-top:16px}.legacy-content .sa-bar {display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:16px}.legacy-content .sa-btn {display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:8px 14px;border-radius:10px;border:1px solid rgba(77,107,254,.35);background:var(--accent-soft);color:var(--accent-deep);font:600 13px/1.2 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;cursor:pointer;transition:background .2s,border-color .2s}.legacy-content .sa-btn.active {background:var(--accent);border-color:var(--accent);color:#fff}.legacy-content .sa-btn.primary {background:var(--accent);border-color:var(--accent);color:#fff}.legacy-content .sa-btn svg {flex:none}.legacy-content .sa-ctrl {display:flex;gap:12px;margin-left:auto}.legacy-content .sa-cap {display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 14px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--sub);font:600 12.5px/1.3 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;cursor:pointer}.legacy-content .sa-cap .dot {width:16px;height:16px;border-radius:5px;border:1.5px solid rgba(77,107,254,.5);display:grid;place-items:center;color:#fff;background:transparent;transition:background .2s}.legacy-content .sa-cap.on {color:var(--accent-deep);border-color:rgba(77,107,254,.4)}.legacy-content .sa-cap.on .dot {background:var(--accent)}.legacy-content .sa-stage {display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:stretch}.legacy-content .sa-pane {background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:12px;min-width:0;display:flex;flex-direction:column}.legacy-content .sa-pane-title {font-size:12px;font-weight:800;letter-spacing:.5px;color:var(--sub);margin-bottom:8px;display:flex;align-items:center;gap:6px}.legacy-content .sa-pane-title svg {color:var(--accent)}.legacy-content .sa-log {display:flex;flex-direction:column;gap:5px}.legacy-content .sa-blk {background:var(--card);border:1px solid var(--border);border-radius:8px;padding:6px 10px;font:11.5px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--text);transition:border-color .25s,box-shadow .25s,opacity .3s}.legacy-content .sa-blk b {color:var(--accent);font-weight:800;margin-right:6px}.legacy-content .sa-blk.on {border-color:var(--accent);box-shadow:0 0 0 2px rgba(77,107,254,.16)}.legacy-content .sa-blk.dim {opacity:.45}.legacy-content .sa-blk.result {border-color:rgba(22,163,74,.5);background:rgba(22,163,74,.06)}.legacy-content .sa-blk.hidden {display:none}.legacy-content .sa-seam {margin-top:10px;border:1.5px dashed rgba(77,107,254,.45);border-radius:10px;padding:8px 10px;background:var(--card);transition:box-shadow .25s,border-color .25s}.legacy-content .sa-seam.on {border-color:var(--accent);box-shadow:0 0 0 3px rgba(77,107,254,.14)}.legacy-content .sa-seam .seam-name {font:800 11px/1.4 ui-monospace,Menlo,monospace;color:var(--accent-deep)}.legacy-content .sa-provs {display:flex;flex-wrap:wrap;gap:5px;margin-top:6px}.legacy-content .sa-prov {font:700 10.5px/1 ui-monospace,Menlo,monospace;color:var(--sub);border:1px solid var(--border);border-radius:6px;padding:4px 7px;background:var(--bg);display:inline-flex;align-items:center;gap:4px;transition:all .25s}.legacy-content .sa-prov.pick {color:#fff;background:var(--accent);border-color:var(--accent)}.legacy-content .sa-caps {margin-bottom:10px;border:1px solid var(--border);border-radius:10px;background:var(--card);overflow:hidden}.legacy-content .sa-caps table {width:100%;border-collapse:collapse;font:11px/1.5 ui-monospace,Menlo,monospace}.legacy-content .sa-caps th, .legacy-content .sa-caps td {padding:5px 10px;text-align:left;border-bottom:1px solid var(--border)}.legacy-content .sa-caps tr:last-child td {border-bottom:none}.legacy-content .sa-caps th {background:var(--accent-soft);color:var(--accent-deep);font-weight:800}.legacy-content .sa-caps td.yes {color:var(--success);font-weight:800}.legacy-content .sa-caps td.no {color:var(--danger);font-weight:800}.legacy-content .sa-caps tr.hot td {background:rgba(77,107,254,.1)}.legacy-content .sa-caps tr.bad td {background:rgba(220,38,38,.07)}.legacy-content .sa-child-wrap {flex:1;display:flex;flex-direction:column;gap:8px}.legacy-content .sa-child {border:1.5px solid rgba(77,107,254,.35);border-radius:12px;background:var(--card);padding:10px;opacity:0;transform:translateY(8px);transition:opacity .35s,transform .35s,border-color .3s}.legacy-content .sa-child.in {opacity:1;transform:translateY(0)}.legacy-content .sa-child.outside {border-style:dashed;border-color:rgba(124,58,237,.45)}.legacy-content .sa-child-head {display:flex;align-items:center;gap:6px;font:800 12px/1.4 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:var(--text);margin-bottom:6px}.legacy-content .sa-child-head .tag {font:700 10px/1 ui-monospace,Menlo,monospace;color:var(--accent-deep);background:var(--accent-soft);border-radius:5px;padding:3px 6px;margin-left:auto}.legacy-content .sa-ctx {display:flex;flex-direction:column;gap:4px;min-height:56px}.legacy-content .sa-ctx .sa-blk {opacity:0;transform:translateX(-8px);transition:opacity .3s,transform .3s}.legacy-content .sa-ctx .sa-blk.in {opacity:1;transform:translateX(0)}.legacy-content .sa-ctx-empty {font-size:11px;color:var(--sub);padding:4px 2px}.legacy-content .sa-working {display:none;align-items:center;gap:7px;font-size:12px;color:var(--sub);margin-top:6px}.legacy-content .sa-working.show {display:flex}.legacy-content .sa-working .wdot {width:6px;height:6px;border-radius:50%;background:var(--accent);animation:saPulse 1s ease infinite}.legacy-content .sa-working .wdot:nth-child(2) {animation-delay:.2s}.legacy-content .sa-working .wdot:nth-child(3) {animation-delay:.4s}@keyframes saPulse{0%,100%{opacity:.25}50%{opacity:1}}.legacy-content .sa-err {display:none;border:1px solid rgba(220,38,38,.45);background:rgba(220,38,38,.07);color:var(--danger);border-radius:10px;padding:9px 12px;font:700 11.5px/1.6 ui-monospace,Menlo,monospace;word-break:break-all}.legacy-content .sa-err.show {display:block}.legacy-content .sa-caption {margin-top:16px;min-height:56px;padding:16px 18px;border-radius:10px;background:var(--accent-soft);border:1px solid rgba(77,107,254,.22);font-size:14px;line-height:1.8;color:var(--text)}.legacy-content .sa-note {font-size:12px;color:var(--sub);margin-top:10px;line-height:1.7}@media(max-width:760px){.legacy-content .facts {grid-template-columns:1fr}.legacy-content .sa-stage {grid-template-columns:1fr}.legacy-content .objective {grid-template-columns:1fr}.legacy-content .lesson-header:after {display:none}.legacy-content .sa-ctrl {margin-left:0;width:100%}.legacy-content .sa-ctrl .sa-btn {flex:1}.legacy-content .source-head {flex-direction:column}}

.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)}