@keyframes _si{from{opacity:0}to{opacity:1}}

.legacy-content .lesson-header .kicker {color:var(--ds)}.legacy-content .l-callout b {color:var(--ds)}.legacy-content .chatarr-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden}.legacy-content .chatarr-legend {display:flex;gap:16px;flex-wrap:wrap;padding:11px 16px;border-bottom:1px solid var(--border);background:rgba(0,0,0,.015);font-size:12px;font-weight:700;color:var(--sub)}.legacy-content .lg-dot {display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}.legacy-content .chatarr-strip {display:flex;gap:10px;padding:18px 16px 16px;overflow-x:auto;align-items:stretch;scroll-behavior:smooth}.legacy-content .arr-cell {flex:0 0 112px;display:flex;flex-direction:column;gap:5px;transition:opacity .5s,filter .5s}.legacy-content .arr-idx {font-family:"SF Mono","Fira Code",Menlo,monospace;font-size:11.5px;font-weight:800;color:var(--sub);text-align:center}.legacy-content .arr-bubble {flex:1;border-radius:10px;padding:8px 10px;font-size:11.5px;line-height:1.55;border:1.5px solid transparent;min-height:66px;font-weight:600}.legacy-content .arr-cell.system .arr-bubble {background:rgba(100,116,139,.12);color:#475569;border-color:rgba(100,116,139,.3)}.legacy-content .arr-cell.user .arr-bubble {background:rgba(2,132,199,.1);color:var(--ds-deep);border-color:rgba(2,132,199,.28)}.legacy-content .arr-cell.assistant .arr-bubble {background:rgba(22,163,74,.09);color:#166534;border-color:rgba(22,163,74,.26)}.legacy-content .arr-role {font-size:10px;font-weight:800;text-align:center;color:var(--sub);letter-spacing:.4px}.legacy-content .arr-winbar {height:4px;border-radius:2px;background:transparent;transition:background .4s}.legacy-content .arr-cell.inwin .arr-winbar {background:var(--ds)}.legacy-content .arr-cell.evicted {opacity:.32;filter:grayscale(.9)}@keyframes cellIn{from{opacity:0;transform:translateY(14px) scale(.85)}to{opacity:1;transform:none}}.legacy-content .arr-cell.fresh {animation:cellIn .45s cubic-bezier(.25,1,.5,1)}.legacy-content .chatarr-foot {padding:14px 16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:12px}.legacy-content .chatarr-controls {display:flex;align-items:center;gap:16px;flex-wrap:wrap}.legacy-content .btn-ds {background:var(--ds);color:#fff;border:none;padding:10px 26px;border-radius:999px;font-size:14px;font-weight:800;cursor:pointer;font-family:inherit;transition:filter .15s,transform .15s}.legacy-content .btn-ds:hover:not(:disabled) {filter:brightness(1.08);transform:translateY(-1px)}.legacy-content .btn-ds:disabled {background:#c4c8cf;cursor:not-allowed}.legacy-content .btn-ghost {background:var(--card);color:var(--sub);border:1.5px solid var(--border);padding:9px 22px;border-radius:999px;font-size:13.5px;font-weight:800;cursor:pointer;font-family:inherit;transition:border-color .15s,color .15s}.legacy-content .btn-ghost:hover {border-color:var(--ds-line);color:var(--ds-deep)}.legacy-content .win-slider {display:flex;align-items:center;gap:10px;flex:1;min-width:220px}.legacy-content .win-slider label {font-size:13px;font-weight:800;color:var(--text);flex-shrink:0}.legacy-content .win-slider input[type=range] {flex:1;min-width:100px;accent-color:var(--ds)}.legacy-content .win-k {font-size:15px;font-weight:900;color:var(--ds);font-variant-numeric:tabular-nums;min-width:56px}.legacy-content .chat-status {font-size:12.5px;color:var(--sub);font-weight:600;line-height:1.7}.legacy-content .chat-status b {color:var(--ds-deep);font-variant-numeric:tabular-nums}.legacy-content .ins-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:18px 20px}.legacy-content .ins-head {display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:14px}.legacy-content .ins-hint {font-size:13px;color:var(--sub);font-weight:600}.legacy-content .ins-counter {font-size:12.5px;font-weight:700;color:var(--sub)}.legacy-content .ins-counter b {font-size:22px;font-weight:900;color:var(--amber);font-variant-numeric:tabular-nums;margin:0 3px}.legacy-content .ins-strip {display:flex;gap:8px;flex-wrap:wrap;min-height:84px}.legacy-content .ins-cell {width:54px;cursor:pointer}.legacy-content .ins-val {height:52px;border-radius:10px;background:rgba(0,0,0,.045);display:flex;align-items:center;justify-content:center;font-weight:900;font-size:17px;color:var(--text);border:1.5px solid transparent;transition:transform .16s,background .16s,border-color .16s}.legacy-content .ins-cell:hover .ins-val {border-color:var(--ds-line);background:var(--ds-soft)}.legacy-content .ins-cell.shifting .ins-val {transform:translateX(26px);background:rgba(217,119,6,.16);border-color:rgba(217,119,6,.5)}.legacy-content .ins-cell.fresh .ins-val {animation:cellIn .4s cubic-bezier(.25,1,.5,1);background:var(--ds-soft);border-color:var(--ds-line);color:var(--ds-deep)}.legacy-content .ins-idx {font-family:"SF Mono","Fira Code",Menlo,monospace;font-size:10.5px;font-weight:800;color:var(--sub);text-align:center;margin-top:4px}.legacy-content .ins-foot {display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:14px;border-top:1px dashed var(--border);padding-top:14px}.legacy-content .ins-log {font-size:13px;color:var(--sub);font-weight:600;line-height:1.7}.legacy-content .ins-log b {color:var(--amber)}.legacy-content .ins-log .ok {color:var(--success);font-weight:800}.legacy-content .know-grid {display:grid;grid-template-columns:1fr 1fr;gap:14px}.legacy-content .know-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow-card)}.legacy-content .know-card .kc-icon {font-size:24px;margin-bottom:8px}.legacy-content .know-card h4 {font-size:15px;font-weight:800;color:var(--text);margin-bottom:6px}.legacy-content .know-card p {font-size:13px;color:var(--sub);line-height:1.75}.legacy-content .know-card p b {color:var(--text)}.legacy-content .know-card code {color:var(--ds-deep)}.legacy-content .takeaway-box {background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border:1.5px solid #bae6fd;border-radius:var(--radius);padding:24px 28px;margin-top:36px}.legacy-content .takeaway-box h3 {font-size:17px;font-weight:800;color:var(--ds-deep);margin-bottom:10px}.legacy-content .takeaway-box ul {list-style:none;padding:0;margin:0}.legacy-content .takeaway-box li {font-size:14.5px;color:#0c4a6e;line-height:1.8;padding:4px 0 4px 22px;position:relative}.legacy-content .takeaway-box li::before {content:'';position:absolute;left:0;top:13px;width:8px;height:8px;border-radius:50%;background:var(--ds)}@media (max-width:768px){.legacy-content .arr-cell {flex:0 0 96px}.legacy-content .ins-cell {width:46px}.legacy-content .ins-val {height:46px;font-size:15px}.legacy-content .know-grid {grid-template-columns:1fr}}

.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)}