@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 .btn-ghost {background:var(--card);color:var(--sub);border:1.5px solid var(--border);padding:9px 20px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;transition:border-color .15s,color .15s}.legacy-content .btn-ghost:hover {border-color:var(--al-line);color:var(--al)}.legacy-content .curve-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:20px 24px}.legacy-content .curve-slider-row {display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:14px}.legacy-content .curve-slider-row label {font-size:13.5px;font-weight:800;color:var(--text);flex-shrink:0}.legacy-content .curve-slider-row input[type=range] {flex:1;min-width:160px;accent-color:var(--al)}.legacy-content .curve-n {font-size:16px;font-weight:900;color:var(--al);font-variant-numeric:tabular-nums;min-width:96px}.legacy-content .curve-layout {display:grid;grid-template-columns:1fr 210px;gap:16px;align-items:stretch}.legacy-content .curve-svg-wrap {min-width:0}.legacy-content .curve-svg-wrap svg {width:100%;height:auto;display:block}.legacy-content .curve-legend {display:flex;flex-direction:column;gap:9px;justify-content:center}.legacy-content .cl-item {border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:9px 13px;display:flex;flex-direction:column;gap:2px}.legacy-content .cl-top {display:flex;align-items:center;gap:8px}.legacy-content .cl-dot {width:10px;height:10px;border-radius:50%;flex-shrink:0}.legacy-content .cl-name {font-size:13px;font-weight:800;color:var(--text);font-family:"SF Mono","Fira Code",Menlo,monospace}.legacy-content .cl-time {font-size:15px;font-weight:800;color:var(--sub);font-variant-numeric:tabular-nums;transition:color .2s}.legacy-content .cl-item.hot .cl-time {color:var(--danger);font-weight:900}.legacy-content .cl-item.hot {border-color:rgba(220,38,38,.35);background:rgba(220,38,38,.04)}.legacy-content .curve-hint {margin-top:14px;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 .curve-hint b {color:var(--al-deep)}.legacy-content .x10-box {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden}.legacy-content .x10-head {padding:14px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;background:rgba(0,0,0,.015)}.legacy-content .x10-n {font-size:13.5px;font-weight:700;color:var(--sub)}.legacy-content .x10-n b {font-size:19px;font-weight:900;color:var(--al);font-variant-numeric:tabular-nums;margin:0 3px}.legacy-content .x10-btns {display:flex;gap:10px;align-items:center}.legacy-content .x10-table {width:100%;border-collapse:collapse}.legacy-content .x10-table td {padding:13px 20px;border-top:1px solid var(--border);font-size:14px;vertical-align:middle}.legacy-content .x10-name {font-family:"SF Mono","Fira Code",Menlo,monospace;font-weight:800;color:var(--text);width:110px}.legacy-content .x10-name .xd {display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:8px;vertical-align:1px}.legacy-content .x10-time {font-weight:900;font-variant-numeric:tabular-nums;font-size:16px;color:var(--text);min-width:130px;display:inline-block;transition:transform .18s,color .18s}.legacy-content .x10-time.roll {transform:translateY(-5px);opacity:0}.legacy-content .x10-time.boom {color:var(--danger)}.legacy-content .x10-tag {text-align:right;width:110px}.legacy-content .x10-tag span {font-size:11.5px;font-weight:800;padding:3px 11px;border-radius:99px;white-space:nowrap}.legacy-content .tag-flat {background:rgba(107,114,128,.1);color:var(--sub)}.legacy-content .tag-tiny {background:rgba(22,163,74,.1);color:var(--success)}.legacy-content .tag-x10 {background:rgba(217,119,6,.12);color:var(--amber)}.legacy-content .tag-x100 {background:rgba(220,38,38,.12);color:var(--danger)}.legacy-content .x10-note {padding:13px 20px;border-top:1px dashed var(--border);font-size:13px;color:var(--sub);line-height:1.8}.legacy-content .x10-note b {color:var(--al-deep)}.legacy-content .quiz-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.legacy-content .quiz-card {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:16px 18px;display:flex;flex-direction:column;gap:12px}.legacy-content .quiz-card h5 {font-size:14px;font-weight:800;color:var(--text)}.legacy-content .quiz-code {font-family:"SF Mono","Fira Code",Menlo,monospace;font-size:12px;line-height:1.75;color:var(--sub);background:rgba(0,0,0,.035);border-radius:8px;padding:11px 13px;white-space:pre;overflow-x:auto;flex:1}.legacy-content .quiz-opts {display:grid;grid-template-columns:1fr 1fr;gap:7px}.legacy-content .quiz-opt {border:1.5px solid var(--border);background:var(--card);border-radius:8px;padding:7px 0;font-size:13px;font-weight:800;font-family:"SF Mono","Fira Code",Menlo,monospace;color:var(--text);cursor:pointer;transition:border-color .15s,background .15s,color .15s}.legacy-content .quiz-opt:hover:not(:disabled) {border-color:var(--al-line)}.legacy-content .quiz-opt:disabled {cursor:default}.legacy-content .quiz-opt.right {background:rgba(22,163,74,.12);border-color:rgba(22,163,74,.5);color:var(--success)}.legacy-content .quiz-opt.wrong {background:rgba(220,38,38,.1);border-color:rgba(220,38,38,.4);color:var(--danger)}.legacy-content .quiz-fb {font-size:12.5px;line-height:1.7;color:var(--sub);min-height:0;opacity:0;transition:opacity .3s}.legacy-content .quiz-fb.show {opacity:1}.legacy-content .quiz-fb b {color:var(--al-deep)}.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 .curve-layout {grid-template-columns:1fr}.legacy-content .curve-legend {flex-direction:row;flex-wrap:wrap}.legacy-content .cl-item {flex:1 1 40%}.legacy-content .quiz-grid {grid-template-columns:1fr}.legacy-content .x10-table td {padding:11px 12px}.legacy-content .x10-tag {width:auto}}

.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)}