@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,.25);border-radius:50%;box-shadow:0 0 0 26px rgba(77,107,254,.05),0 0 0 52px rgba(77,107,254,.03)}.legacy-content .lesson p {font-size:15px;line-height:2;margin:0 0 20px}.legacy-content .lesson .sec-label {margin:56px 0 20px}.legacy-content .q {color:var(--accent-deep)}.legacy-content .src {display:block;font-size:12px;line-height:1.7;color:var(--sub);margin:-8px 0 20px}.legacy-content .punch {margin:32px auto;padding:24px 28px;max-width:640px;text-align:center;font-size:18px;font-weight:800;color:var(--accent-deep);background:var(--accent-soft);border:1px solid rgba(77,107,254,.25);border-radius:16px;line-height:1.8}.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 26px;margin:18px 0 28px}.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 .arch {background:var(--bg);border:1px solid rgba(77,107,254,.25);border-radius:18px;padding:28px;margin:0 0 20px;box-shadow:var(--shadow-card)}.legacy-content .arch svg {width:100%;height:auto;display:block}.legacy-content .visual-caption {font-size:12px;color:var(--sub);text-align:center;margin-top:14px;line-height:1.7}.legacy-content .docquote {background:var(--card);border:1px solid rgba(77,107,254,.24);border-radius:14px;padding:24px 26px;margin:0 0 20px;box-shadow:var(--shadow-card)}.legacy-content .docquote p {margin:0 0 10px;font-size:14px;line-height:1.9;color:var(--text)}.legacy-content .docquote p:last-of-type {margin-bottom:0}.legacy-content .docquote .dq-src {display:block;margin-top:12px;font:11.5px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--sub)}.legacy-content .modes {display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:0 0 20px}.legacy-content .mode-card {background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px;box-shadow:var(--shadow-card)}.legacy-content .mode-card h3 {margin:0 0 6px;font-size:16px;color:var(--text)}.legacy-content .mode-card .dir {display:block;font:12px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--sub);margin-bottom:16px}.legacy-content .mode-card dl {margin:0}.legacy-content .mode-card dt {font-size:12.5px;font-weight:800;color:var(--accent-deep);margin:14px 0 4px}.legacy-content .mode-card dt:first-of-type {margin-top:0}.legacy-content .mode-card dd {margin:0;font-size:14px;line-height:1.9;color:var(--sub)}.legacy-content .mode-card .m-src {display:block;margin-top:16px;font-size:11.5px;line-height:1.7;color:var(--sub)}.legacy-content .exercise {display:grid;grid-template-columns:52px 1fr;gap:18px;background:linear-gradient(135deg,var(--accent-soft),var(--card));border:1px solid rgba(77,107,254,.3);border-radius:16px;padding:26px;margin-top:12px}.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 28px;border-radius:16px;background:var(--accent-soft);border:1px solid rgba(77,107,254,.25);color:var(--text);display:flex;gap:14px;font-size: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 .compare {display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:0 0 20px}.legacy-content .compare-card {background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px;box-shadow:var(--shadow-card)}.legacy-content .compare-card:first-child {grid-column:1/-1}.legacy-content .compare-card h3 {margin:0 0 10px;font-size:15px;color:var(--text);display:flex;align-items:center;gap:8px}.legacy-content .compare-card h3 svg {color:var(--accent)}.legacy-content .compare-card p {font-size:14px;line-height:1.9;color:var(--sub);margin:0 0 10px}.legacy-content .compare-card p:last-child {margin-bottom:0}.legacy-content .compare-card .verdict {display:inline-block;font-size:12px;font-weight:800;padding:4px 12px;border-radius:999px;margin-bottom:12px}.legacy-content .v-no {background:rgba(22,163,74,.12);color:var(--success)}.legacy-content .v-yes {background:rgba(220,38,38,.10);color:var(--danger)}.legacy-content .v-mid {background:rgba(217,119,6,.12);color:var(--amber)}.legacy-content .demo {background:var(--card);border:1px solid rgba(77,107,254,.25);border-radius:18px;padding:28px;box-shadow:var(--shadow-card)}.legacy-content .demo-controls {display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:16px}.legacy-content .mode-btn {border:1px solid rgba(77,107,254,.3);background:var(--bg);color:var(--accent-deep);border-radius:12px;padding:10px 18px;font-family:inherit;font-weight:700;font-size:14px;cursor:pointer;min-height:48px;transition:all .2s}.legacy-content .mode-btn:hover {border-color:var(--accent)}.legacy-content .mode-btn.active {background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(77,107,254,.35)}.legacy-content .mode-btn small {display:block;font-weight:400;font-size:10.5px;opacity:.75;margin-top:1px;font-family:ui-monospace,Menlo,monospace}.legacy-content .demo-aux {margin-left:auto;display:flex;gap:12px}.legacy-content .aux-btn {display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--card);color:var(--sub);border-radius:12px;padding:10px 16px;font-family:inherit;font-size:13px;font-weight:700;cursor:pointer;min-height:48px;transition:all .2s}.legacy-content .aux-btn:hover {color:var(--accent-deep);border-color:rgba(77,107,254,.4)}.legacy-content .demo-status {font-size:12.5px;color:var(--sub);margin-bottom:16px;min-height:20px;font-family:ui-monospace,Menlo,monospace}.legacy-content .plugin-grid {display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px}.legacy-content .pcard {border:1px solid var(--border);background:var(--bg);border-radius:12px;padding:12px 14px;transition:all .45s;position:relative;overflow:hidden}.legacy-content .pcard .pid {font:700 13px ui-monospace,Menlo,monospace;color:var(--text);display:block;word-break:break-all}.legacy-content .pcard .ppkg {font:11px ui-monospace,Menlo,monospace;color:var(--sub);display:block;margin-top:4px;word-break:break-all}.legacy-content .pcard.off {opacity:.3;filter:grayscale(1)}.legacy-content .pcard.on {border-color:rgba(77,107,254,.4);background:var(--accent-soft)}.legacy-content .pcard.added {border-color:rgba(22,163,74,.5);background:rgba(22,163,74,.10);box-shadow:0 0 0 1px rgba(22,163,74,.35)}.legacy-content .pcard.added .pid {color:var(--success)}.legacy-content .pcard.removed {border-color:rgba(220,38,38,.4);background:rgba(220,38,38,.06);opacity:.6}.legacy-content .pcard.removed .pid {color:var(--danger);text-decoration:line-through}.legacy-content .pcard.changed {border-color:rgba(217,119,6,.5);box-shadow:0 0 0 1px rgba(217,119,6,.35);background:rgba(217,119,6,.08)}.legacy-content .pcard.changed .pid {color:var(--amber)}.legacy-content .pbadge {position:absolute;top:8px;right:9px;font-family:inherit;font-weight:800;font-size:10px;padding:1px 7px;border-radius:999px;letter-spacing:.5px}.legacy-content .pbadge.b-add {background:var(--success);color:#fff}.legacy-content .pbadge.b-del {background:var(--danger);color:#fff}.legacy-content .pbadge.b-chg {background:var(--amber);color:#fff}.legacy-content .demo-caption {margin-top:18px;padding:16px 20px;border-radius:12px;background:var(--accent-soft);border:1px solid rgba(77,107,254,.2);font-size:14px;line-height:1.9;color:var(--text);display:flex;gap:10px;align-items:flex-start;min-height:56px}.legacy-content .demo-caption svg {flex:0 0 auto;color:var(--accent);margin-top:5px}.legacy-content .demo-legend {display:flex;flex-wrap:wrap;gap:16px;margin-top:14px;font-size:12px;color:var(--sub)}.legacy-content .demo-legend i {display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}.legacy-content .demo-note {font-size:12px;color:var(--sub);margin-top:12px;line-height:1.8}@media(max-width:760px){.legacy-content .modes {grid-template-columns:1fr}.legacy-content .compare {grid-template-columns:1fr}.legacy-content .plugin-grid {grid-template-columns:1fr 1fr}.legacy-content .demo-aux {margin-left:0;width:100%}.legacy-content .objective {grid-template-columns:1fr}.legacy-content .exercise {grid-template-columns:1fr}.legacy-content .punch {padding:20px;font-size:16px}.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)}