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

.legacy-content .lesson-header .kicker {color:var(--al)}.legacy-content .l-callout b {color:var(--al)}.legacy-content .btn-al {background:var(--al);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-al:hover:not(:disabled) {filter:brightness(1.08);transform:translateY(-1px)}.legacy-content .btn-al:disabled {background:#c4c8cf;cursor:not-allowed}.legacy-content .race-controls {display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}.legacy-content .race-controls .rc-label {font-size:13px;font-weight:800;color:var(--sub)}.legacy-content .size-btn {border:1.5px solid var(--border);background:var(--card);border-radius:999px;padding:7px 18px;font-size:13px;font-weight:800;color:var(--text);cursor:pointer;font-family:inherit;transition:all .15s}.legacy-content .size-btn:hover:not(:disabled) {border-color:var(--al-line)}.legacy-content .size-btn.active {background:var(--al);border-color:var(--al);color:#fff}.legacy-content .size-btn:disabled {opacity:.5;cursor:not-allowed}.legacy-content .race-status {font-size:12.5px;color:var(--sub);font-weight:600}.legacy-content .lane {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden;margin-bottom:14px}.legacy-content .lane-head {display:flex;align-items:center;gap:12px;padding:12px 18px;border-bottom:1px solid var(--border);background:rgba(0,0,0,.015);flex-wrap:wrap}.legacy-content .lane-head h4 {font-size:14.5px;font-weight:800;color:var(--text)}.legacy-content .lane-head .lh-sub {font-size:11.5px;font-weight:700;color:var(--sub)}.legacy-content .lane-cmp {margin-left:auto;font-size:12px;font-weight:700;color:var(--sub);font-variant-numeric:tabular-nums}.legacy-content .lane-cmp b {font-size:17px;font-weight:900;color:var(--text);margin-right:2px}.legacy-content .lane-medal {font-size:11.5px;font-weight:800;padding:3px 12px;border-radius:99px;background:rgba(22,163,74,.12);color:var(--success);display:none;white-space:nowrap}.legacy-content .lane-medal.show {display:inline-block}.legacy-content .lane-stage {height:150px;display:flex;align-items:flex-end;gap:2px;padding:14px 18px 12px}.legacy-content .bar {flex:1;min-width:2px;background:var(--al);opacity:.55;border-radius:3px 3px 0 0;transition:height .12s ease}.legacy-content .bar.cmp {background:var(--amber);opacity:1}.legacy-content .bar.piv {background:var(--purple);opacity:1}.legacy-content .bar.done {background:var(--success);opacity:.85}.legacy-content .race-note {margin-top:4px;padding:13px 16px;background:var(--al-soft);border:1.5px dashed var(--al-line);border-radius:var(--radius-sm);font-size:13.5px;line-height:1.8;color:var(--sub)}.legacy-content .race-note b {color:var(--al-deep)}.legacy-content .idea-grid {display:grid;grid-template-columns:1fr 1fr;gap:14px}.legacy-content .idea-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:18px 20px}.legacy-content .idea-card h4 {font-size:14.5px;font-weight:800;color:var(--text);display:flex;align-items:center;gap:8px;margin-bottom:7px}.legacy-content .idea-badge {font-size:10.5px;font-weight:800;padding:2px 10px;border-radius:99px;font-family:"SF Mono","Fira Code",Menlo,monospace}.legacy-content .idea-card.slow .idea-badge {background:rgba(220,38,38,.1);color:var(--danger)}.legacy-content .idea-card.fast .idea-badge {background:rgba(22,163,74,.1);color:var(--success)}.legacy-content .idea-card p {font-size:13px;color:var(--sub);line-height:1.8}.legacy-content .idea-card p b {color:var(--text)}.legacy-content .honest-card {background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1.5px solid #fde68a;border-radius:var(--radius);padding:20px 24px;margin-top:24px}.legacy-content .honest-card h4 {font-size:15px;font-weight:800;color:#92400e;margin-bottom:8px}.legacy-content .honest-card p {font-size:13.5px;color:#78350f;line-height:1.85}.legacy-content .honest-card p b {color:#b45309}.legacy-content .honest-card code {background:rgba(180,83,9,.1);color:#b45309}.legacy-content .takeaway-box {background:linear-gradient(135deg,#fdf2f8,#fce7f3);border:1.5px solid #fbcfe8;border-radius:var(--radius);padding:24px 28px;margin-top:36px}.legacy-content .takeaway-box h3 {font-size:17px;font-weight:800;color:#9d174d;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:#831843;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:#db2777}@media (max-width:768px){.legacy-content .idea-grid {grid-template-columns:1fr}.legacy-content .lane-stage {height:110px;padding:10px 12px 8px}.legacy-content .lane-head {padding:10px 12px}}

.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)}