@keyframes _si{to{opacity:1}}

.legacy-content .desc {font-size:16px;color:var(--sub);line-height:1.8;margin-bottom:8px}.legacy-content .vs-panel {display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:8px}@media(max-width:768px){.legacy-content .vs-panel {grid-template-columns:1fr}}.legacy-content .vs-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:14px}.legacy-content .vs-box h3 {font-size:17px;font-weight:800;margin:0;display:flex;align-items:center;gap:8px}.legacy-content .vs-box.hci h3 {color:var(--sub)}.legacy-content .vs-box.aci h3 {color:var(--accent)}.legacy-content .vs-tag {font-size:11px;font-weight:700;padding:3px 10px;border-radius:6px;letter-spacing:.5px}.legacy-content .vs-tag.old {background:rgba(107,114,128,.1);color:var(--sub)}.legacy-content .vs-tag.new {background:rgba(0,102,255,.1);color:var(--accent)}.legacy-content .vs-code {background:rgba(0,0,0,.03);border-radius:var(--radius-sm);padding:14px 16px;font-family:"SF Mono","Fira Code",Menlo,monospace;font-size:13.5px;line-height:1.6;color:var(--text);border:1px dashed var(--border);white-space:pre-wrap}.legacy-content .vs-desc {font-size:14px;color:var(--sub);line-height:1.7}.legacy-content .vs-arrow {text-align:center;font-size:13px;color:var(--sub);padding:2px 0;font-weight:600}.legacy-content .quote-block {background:rgba(0,102,255,.04);border-radius:var(--radius);padding:20px 24px;font-size:15px;line-height:1.8;color:var(--text);margin-top:12px}.legacy-content .quote-block .attr {font-size:13px;color:var(--sub);margin-top:10px;font-style:italic}.legacy-content .decision-flow {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);margin-top:8px}.legacy-content .flow-title {font-size:15px;font-weight:800;color:var(--text);margin-bottom:16px;display:flex;align-items:center;gap:8px}.legacy-content .flow-steps {display:flex;flex-direction:column;gap:12px}.legacy-content .flow-step {display:flex;align-items:flex-start;gap:14px;padding:14px 16px;border-radius:var(--radius-sm);background:var(--bg)}.legacy-content .flow-step .step-num {width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0}.legacy-content .flow-step .step-body {flex:1}.legacy-content .flow-step .step-q {font-size:14px;font-weight:700;color:var(--text);margin-bottom:4px}.legacy-content .flow-step .step-a {font-size:13px;color:var(--sub);line-height:1.6}.legacy-content .principle-grid {display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:8px}@media(max-width:768px){.legacy-content .principle-grid {grid-template-columns:1fr}}.legacy-content .p-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:10px}.legacy-content .p-card .p-num {font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.5px}.legacy-content .p-card h4 {font-size:15px;font-weight:800;color:var(--text);margin:0;line-height:1.4}.legacy-content .p-card .p-detail {font-size:13.5px;color:var(--sub);line-height:1.7}.legacy-content .p-card .p-example {background:rgba(0,0,0,.03);border-radius:var(--radius-sm);padding:10px 14px;font-size:13px;line-height:1.6;color:var(--text);border:1px dashed var(--border)}.legacy-content .p-card .p-example b {color:var(--accent)}.legacy-content .case-panel {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);margin-top:8px}.legacy-content .case-panel h4 {font-size:16px;font-weight:800;color:var(--text);margin:0 0 14px;display:flex;align-items:center;gap:8px}.legacy-content .case-before-after {display:grid;grid-template-columns:1fr 1fr;gap:16px}@media(max-width:768px){.legacy-content .case-before-after {grid-template-columns:1fr}}.legacy-content .case-side {border-radius:var(--radius-sm);padding:16px 18px}.legacy-content .case-side.before {background:rgba(220,38,38,.04);border:1px solid rgba(220,38,38,.15)}.legacy-content .case-side.after {background:rgba(22,163,74,.04);border:1px solid rgba(22,163,74,.15)}.legacy-content .case-side .case-label {font-size:12px;font-weight:800;letter-spacing:.5px;margin-bottom:8px}.legacy-content .case-side.before .case-label {color:var(--danger)}.legacy-content .case-side.after .case-label {color:var(--success)}.legacy-content .case-side .case-code {font-family:"SF Mono","Fira Code",Menlo,monospace;font-size:13px;line-height:1.6;color:var(--text);white-space:pre-wrap}.legacy-content .case-side .case-result {font-size:13px;color:var(--sub);margin-top:10px;line-height:1.6}.legacy-content .doc-tips {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-card);margin-top:8px}.legacy-content .doc-tips h4 {font-size:16px;font-weight:800;color:var(--text);margin:0 0 14px}.legacy-content .tip-list {display:flex;flex-direction:column;gap:10px}.legacy-content .tip-item {display:flex;align-items:flex-start;gap:12px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--bg);font-size:14px;color:var(--text);line-height:1.6}.legacy-content .tip-item svg {flex-shrink:0;margin-top:2px;color:var(--accent)}.legacy-content .takeaway {background:rgba(0,102,255,.04);border:1.5px solid rgba(0,102,255,.18);border-radius:var(--radius);padding:16px 20px;font-size:15px;color:var(--text);display:flex;gap:10px;line-height:1.7;margin-top:20px}.legacy-content .takeaway b {color:var(--accent)}

.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)}