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

.legacy-content .lesson-header .kicker {color:var(--vibe)}.legacy-content .desc {font-size:15px;color:var(--sub);line-height:1.8}.legacy-content .bug-box {background:rgba(220,38,38,.05);border:1.5px solid rgba(220,38,38,.22);border-radius:10px;padding:13px 16px;font-size:14.5px;line-height:1.75;color:var(--text);margin-top:12px}.legacy-content .bug-box b {color:var(--danger)}.legacy-content .path-row {display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.legacy-content .path-btn {display:flex;align-items:center;gap:12px;padding:13px 16px;border-radius:12px;border:1.5px solid var(--border);background:var(--card);cursor:pointer;transition:all .2s;font-family:inherit;text-align:left;width:100%;min-height:44px;box-shadow:var(--shadow-card)}.legacy-content .path-btn:hover {border-color:rgba(0,0,0,.15)}.legacy-content .path-btn h4 {font-size:15px;font-weight:800;color:var(--text);margin-bottom:2px}.legacy-content .path-btn p {font-size:13px;color:var(--sub)}.legacy-content .path-icon {width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:19px;flex-shrink:0}.legacy-content .path-btn.p0 .path-icon {background:rgba(220,38,38,.1)}.legacy-content .path-btn.p1 .path-icon {background:var(--vibe-soft)}.legacy-content .path-btn.p0.active {border-color:var(--danger);background:rgba(220,38,38,.04)}.legacy-content .path-btn.p0.active h4 {color:var(--danger)}.legacy-content .path-btn.p1.active {border-color:var(--vibe);background:rgba(13,148,136,.05)}.legacy-content .path-btn.p1.active h4 {color:var(--vibe-deep)}.legacy-content .stat-row {display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:14px}.legacy-content .stat {background:var(--card);border:1.5px solid var(--border);border-radius:12px;padding:12px 14px;text-align:center}.legacy-content .stat .sv {font-size:26px;font-weight:800;color:var(--text);font-family:"SF Mono",Menlo,monospace;line-height:1.3}.legacy-content .stat .sv.hot {color:var(--danger)}.legacy-content .stat .sv.cool {color:var(--vibe-deep)}.legacy-content .stat .sl {font-size:12px;color:var(--sub);font-weight:700;letter-spacing:.4px}.legacy-content .vis-wrap {background:var(--card);border:1.5px solid var(--border);border-radius:14px;display:flex;flex-direction:column;overflow:hidden;margin-top:14px}.legacy-content .vis-bar {padding:10px 16px;border-bottom:1px solid var(--border);background:rgba(0,0,0,.02);display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.legacy-content .vis-bar-title {font-size:14px;font-weight:700;color:var(--sub)}.legacy-content .vis-body {min-height:240px;max-height:400px;padding:16px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.legacy-content .msg {padding:10px 14px;border-radius:10px;font-size:14.5px;line-height:1.65;opacity:0;transform:translateY(8px);transition:all .35s ease;flex-shrink:0}.legacy-content .msg.show {opacity:1;transform:translateY(0)}.legacy-content .msg.ai {background:rgba(0,0,0,.045);color:var(--text)}.legacy-content .msg.log {background:var(--surface-soft);color:#5eead4;font-family:"SF Mono",Menlo,monospace;font-size:13px}.legacy-content .msg.warning {background:rgba(220,38,38,.07);color:var(--danger);font-weight:600}.legacy-content .msg.ok {background:rgba(22,163,74,.08);color:var(--success);font-weight:600}.legacy-content .msg.fix {background:var(--vibe-soft);color:var(--vibe-deep);font-family:"SF Mono",Menlo,monospace;font-size:13px}.legacy-content .ctrl-row {display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:12px}.legacy-content .btn {padding:11px 22px;border-radius:9px;font-size:15px;font-weight:700;border:none;cursor:pointer;font-family:inherit;transition:all .2s;min-height:44px}.legacy-content .btn-p {background:var(--vibe);color:#fff}.legacy-content .btn-p:hover {filter:brightness(1.1)}.legacy-content .btn-p:disabled {opacity:.35;cursor:not-allowed}.legacy-content .btn-r {background:rgba(0,0,0,.05);color:var(--sub);border:1px solid var(--border)}.legacy-content .hint {font-size:13px;color:var(--sub)}.legacy-content .score-grid {display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}.legacy-content .score-box {border-radius:12px;padding:14px 16px;border:1.5px solid var(--border);background:var(--card)}.legacy-content .score-box h4 {font-size:14px;font-weight:800;margin-bottom:6px}.legacy-content .score-box.s0 h4 {color:var(--danger)}.legacy-content .score-box.s1 h4 {color:var(--vibe-deep)}.legacy-content .score-box .sd {font-size:13.5px;color:var(--sub);line-height:1.7;font-family:"SF Mono",Menlo,monospace}.legacy-content .score-box.done.s0 {border-color:rgba(220,38,38,.3);background:rgba(220,38,38,.03)}.legacy-content .score-box.done.s1 {border-color:rgba(13,148,136,.35);background:rgba(13,148,136,.04)}.legacy-content .qcheck {margin-top:14px;display:flex;flex-direction:column;gap:10px}.legacy-content .qc-item {border:1.5px solid var(--border);border-radius:12px;background:var(--card);overflow:hidden;box-shadow:var(--shadow-card)}.legacy-content .qc-head {display:flex;align-items:center;gap:12px;width:100%;padding:14px 16px;background:none;border:none;cursor:pointer;font-family:inherit;text-align:left;min-height:44px}.legacy-content .qc-badge {width:30px;height:30px;border-radius:8px;background:rgba(0,0,0,.05);color:var(--sub);font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .2s}.legacy-content .qc-item.open .qc-badge {background:var(--vibe);color:#fff}.legacy-content .qc-head h4 {font-size:15px;font-weight:700;color:var(--text);flex:1}.legacy-content .qc-arrow {font-size:13px;color:var(--sub);transition:transform .2s}.legacy-content .qc-item.open .qc-arrow {transform:rotate(90deg)}.legacy-content .qc-body {display:none;padding:0 16px 14px 58px;font-size:13.5px;color:var(--sub);line-height:1.75}.legacy-content .qc-item.open .qc-body {display:block}.legacy-content .qc-body b {color:var(--vibe-deep)}.legacy-content .unlock-area {margin-top:14px}.legacy-content .fix-result {display:none;margin-top:12px}.legacy-content .fix-result.show {display:block}.legacy-content .imp-line {font-family:"SF Mono",Menlo,monospace;font-size:13.5px;background:rgba(0,0,0,.04);border-radius:8px;padding:10px 14px;margin-top:10px;color:var(--text)}.legacy-content .src-note {margin-top:24px;font-size:12.5px;color:var(--sub)}.legacy-content .src-note a {color:var(--vibe-deep)}@media (max-width:768px){.legacy-content .path-row {grid-template-columns:1fr}.legacy-content .stat-row {grid-template-columns:1fr 1fr 1fr}.legacy-content .score-grid {grid-template-columns:1fr}.legacy-content .qc-body {padding-left:16px}}

.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)}