@keyframes _si{to{opacity:1}}

.legacy-content .chain-wrap {display:flex;flex-direction:column;align-items:center;gap:0;margin-top:8px;position:relative}.legacy-content .chain-node {width:100%;max-width:520px;padding:16px 22px;border-radius:var(--radius);border:1.5px solid var(--border);background:var(--card);box-shadow:var(--shadow-card);display:flex;align-items:center;gap:14px;opacity:0;transform:translateX(-20px);transition:all .5s ease}.legacy-content .chain-node.active {opacity:1;transform:translateX(0)}.legacy-content .chain-node.fail {border-color:rgba(220,38,38,.4)}.legacy-content .chain-node.success {border-color:rgba(22,163,74,.4)}.legacy-content .chain-node.fallback {border-color:rgba(217,119,6,.4)}.legacy-content .chain-node.final {border-color:rgba(124,58,237,.4)}.legacy-content .chain-node .node-icon {width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden}.legacy-content .chain-node .node-icon img {width:100%;height:100%;object-fit:cover;border-radius:12px}.legacy-content .chain-node.fail .node-icon {background:rgba(220,38,38,.08)}.legacy-content .chain-node.success .node-icon {background:rgba(22,163,74,.08)}.legacy-content .chain-node.fallback .node-icon {background:rgba(217,119,6,.08)}.legacy-content .chain-node.final .node-icon {background:rgba(124,58,237,.08)}.legacy-content .chain-node .node-text {flex:1}.legacy-content .chain-node .node-title {font-size:14px;font-weight:700;color:var(--text)}.legacy-content .chain-node .node-desc {font-size:12px;color:var(--sub);margin-top:2px}.legacy-content .chain-connector {width:2px;height:24px;background:var(--border);position:relative}.legacy-content .chain-connector::after {content:'↓';position:absolute;bottom:-4px;left:50%;transform:translateX(-50%);color:var(--sub);font-size:11px;background:var(--bg);padding:0 4px}.legacy-content .replay-btn {display:block;margin:20px auto 0;background:var(--accent);color:#fff;border:none;padding:10px 24px;border-radius:999px;font-size:14px;font-weight:700;cursor:pointer;font-family:inherit;box-shadow:0 4px 14px rgba(0,102,255,.25);transition:transform .15s,box-shadow .15s}.legacy-content .replay-btn:hover {transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,102,255,.35)}.legacy-content .replay-btn:active {transform:translateY(0)}.legacy-content .state-imgs {display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}@media(max-width:768px){.legacy-content .state-imgs {grid-template-columns:1fr}}.legacy-content .state-item {text-align:center;background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow-card)}.legacy-content .state-item img {max-width:120px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.06);margin-bottom:10px}.legacy-content .state-item .s-label {font-size:13px;font-weight:700;color:var(--text)}.legacy-content .state-item .s-desc {font-size:12px;color:var(--sub);margin-top:4px;line-height:1.5}.legacy-content .concept-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:8px}@media(max-width:768px){.legacy-content .concept-grid {grid-template-columns:1fr}}.legacy-content .concept-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow-card)}.legacy-content .concept-card .c-icon {width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:10px}.legacy-content .concept-card .c-title {font-size:15px;font-weight:800;color:var(--text);margin-bottom:6px}.legacy-content .concept-card .c-desc {font-size:13px;color:var(--sub);line-height:1.6}.legacy-content .result-demo {display:flex;align-items:center;gap:16px;margin-top:20px;padding:20px;background:var(--card);border:1.5px solid rgba(22,163,74,.3);border-radius:var(--radius);box-shadow:var(--shadow-card)}@media(max-width:768px){.legacy-content .result-demo {flex-direction:column}}.legacy-content .result-demo img {max-width:200px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.08);flex-shrink:0}.legacy-content .result-demo .result-text {flex:1}.legacy-content .result-demo .result-text h4 {font-size:16px;font-weight:800;color:var(--success);margin:0 0 8px}.legacy-content .result-demo .result-text p {font-size:14px;color:var(--sub);line-height:1.7;margin:0}.legacy-content .takeaway {background:rgba(217,119,6,.04);border:1.5px solid rgba(217,119,6,.18);border-radius:var(--radius);padding:16px 20px;font-size:15px;color:var(--text);display:flex;gap:10px;line-height:1.7;margin-top:24px}.legacy-content .takeaway b {color:var(--amber)}

.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)}