@keyframes _si{to{opacity:1}}

.legacy-content .hero-dark {background:linear-gradient(135deg, #e9f0e6 0%, #fffefa 100%);border-radius:var(--radius);padding:52px 40px;margin-bottom:36px;color:#fff;position:relative;overflow:hidden}.legacy-content .hero-dark::before {content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0v60M0 30h60' stroke='%23ffffff' stroke-width='.3' opacity='.06'/%3E%3C/svg%3E");pointer-events:none}.legacy-content .hero-dark::after {content:'⚠';position:absolute;right:32px;bottom:-20px;font-size:140px;opacity:.04;pointer-events:none}.legacy-content .hero-dark .hd-kicker {font-size:12px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:rgba(251,191,36,.7);margin-bottom:14px;position:relative}.legacy-content .hero-dark h2 {font-size:28px;font-weight:900;line-height:1.4;margin-bottom:14px;position:relative}.legacy-content .hero-dark h2 em {font-style:normal;color:#fbbf24}.legacy-content .hero-dark .hd-sub {font-size:15px;color:rgba(255,255,255,.6);line-height:1.75;max-width:640px;position:relative}@media(max-width:768px){.legacy-content .hero-dark {padding:36px 24px}.legacy-content .hero-dark h2 {font-size:22px}}.legacy-content .reality-box {background:linear-gradient(135deg,#fef2f2,#fff7ed);border:1.5px solid #fecaca;border-radius:var(--radius);padding:28px 28px 24px;margin-bottom:12px}.legacy-content .reality-box h3 {font-size:18px;font-weight:800;color:#dc2626;margin-bottom:10px;display:flex;align-items:center;gap:10px}.legacy-content .reality-box p {font-size:14.5px;color:#7f1d1d;line-height:1.8}.legacy-content .reality-box b {color:#b91c1c}.legacy-content .fail-grid {display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0}.legacy-content .fail-item {background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;display:flex;gap:12px;align-items:flex-start;transition:border-color .2s,box-shadow .2s}.legacy-content .fail-item:hover {border-color:var(--danger);box-shadow:0 4px 16px rgba(220,38,38,.06)}.legacy-content .fail-num {width:28px;height:28px;border-radius:8px;background:rgba(220,38,38,.08);color:#dc2626;font-size:13px;font-weight:900;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}.legacy-content .fail-body {flex:1}.legacy-content .fail-body strong {font-size:14px;color:var(--text);display:block;margin-bottom:3px}.legacy-content .fail-body span {font-size:12.5px;color:var(--sub);line-height:1.6}@media(max-width:600px){.legacy-content .fail-grid {grid-template-columns:1fr}.legacy-content .fail-item {padding:14px 14px}}.legacy-content .challenge-card {background:var(--card);border-radius:var(--radius);padding:28px 28px 24px;margin-bottom:20px;position:relative;overflow:hidden;border:1.5px solid var(--border);box-shadow:var(--shadow-card);transition:border-color .2s,box-shadow .2s}.legacy-content .challenge-card:hover {box-shadow:var(--shadow-pop)}.legacy-content .challenge-card .ch-stripe {position:absolute;left:0;top:0;bottom:0;width:5px}.legacy-content .challenge-card .ch-num {position:absolute;top:20px;right:22px;font-size:56px;font-weight:900;line-height:1;pointer-events:none}.legacy-content .challenge-card .ch-head {display:flex;align-items:center;gap:14px;margin-bottom:14px}.legacy-content .challenge-card .ch-icon {width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.legacy-content .challenge-card .ch-tag {font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:3px 8px;border-radius:6px;display:inline-block;margin-bottom:6px}.legacy-content .challenge-card .ch-title {font-size:17px;font-weight:800;color:var(--text)}.legacy-content .challenge-card .ch-body {font-size:14.5px;color:var(--sub);line-height:1.8;position:relative}.legacy-content .challenge-card .ch-body b {color:var(--text)}@media(max-width:600px){.legacy-content .challenge-card {padding:22px 18px 20px}.legacy-content .challenge-card .ch-num {font-size:40px;right:14px;top:14px}}.legacy-content .cat-eval {--cat:#dc2626;--cat-bg:rgba(220,38,38,.06);--cat-border:rgba(220,38,38,.18);--cat-tag-bg:rgba(220,38,38,.08)}.legacy-content .cat-data {--cat:#7c3aed;--cat-bg:rgba(124,58,237,.06);--cat-border:rgba(124,58,237,.18);--cat-tag-bg:rgba(124,58,237,.08)}.legacy-content .cat-safety {--cat:#d97706;--cat-bg:rgba(217,119,6,.06);--cat-border:rgba(217,119,6,.18);--cat-tag-bg:rgba(217,119,6,.08)}.legacy-content .cat-human {--cat:#0066ff;--cat-bg:rgba(0,102,255,.06);--cat-border:rgba(0,102,255,.18);--cat-tag-bg:rgba(0,102,255,.08)}.legacy-content .cat-eval .ch-stripe {background:var(--cat)}.legacy-content .cat-data .ch-stripe {background:var(--cat)}.legacy-content .cat-safety .ch-stripe {background:var(--cat)}.legacy-content .cat-human .ch-stripe {background:var(--cat)}.legacy-content .cat-eval .ch-num, .legacy-content .cat-data .ch-num, .legacy-content .cat-safety .ch-num, .legacy-content .cat-human .ch-num {color:var(--cat-bg)}.legacy-content .cat-eval .ch-icon {background:var(--cat-bg);color:var(--cat)}.legacy-content .cat-data .ch-icon {background:var(--cat-bg);color:var(--cat)}.legacy-content .cat-safety .ch-icon {background:var(--cat-bg);color:var(--cat)}.legacy-content .cat-human .ch-icon {background:var(--cat-bg);color:var(--cat)}.legacy-content .cat-eval .ch-tag {background:var(--cat-tag-bg);color:var(--cat)}.legacy-content .cat-data .ch-tag {background:var(--cat-tag-bg);color:var(--cat)}.legacy-content .cat-safety .ch-tag {background:var(--cat-tag-bg);color:var(--cat)}.legacy-content .cat-human .ch-tag {background:var(--cat-tag-bg);color:var(--cat)}.legacy-content .cat-eval:hover {border-color:var(--cat-border)}.legacy-content .cat-data:hover {border-color:var(--cat-border)}.legacy-content .cat-safety:hover {border-color:var(--cat-border)}.legacy-content .cat-human:hover {border-color:var(--cat-border)}.legacy-content .final-takeaway {background:linear-gradient(135deg,#eff6ff,#eef2ff);border:1.5px solid #bfdbfe;border-radius:var(--radius);padding:28px 28px 24px;margin-top:36px}.legacy-content .final-takeaway h3 {font-size:18px;font-weight:800;color:#1e40af;margin-bottom:14px;display:flex;align-items:center;gap:10px}.legacy-content .final-takeaway p {font-size:15px;color:#1e3a5f;line-height:1.85}.legacy-content .final-takeaway p b {color:#1e40af}.legacy-content .final-takeaway .ft-divider {border:none;border-top:1px solid rgba(59,130,246,.15);margin:16px 0}.legacy-content .final-takeaway .ft-closing {font-size:16px;font-weight:700;color:#1e40af;margin-top:4px;line-height:1.7}.legacy-content .cat-legend {display:flex;flex-wrap:wrap;gap:16px;margin:20px 0 8px;font-size:12px;font-weight:600}.legacy-content .cat-legend span {display:flex;align-items:center;gap:6px}.legacy-content .cat-legend .dot {width:10px;height:10px;border-radius:3px;flex-shrink:0}.legacy-content .plain-talk {background:linear-gradient(135deg,#fffbeb,#fef9c3);border:1.5px dashed #fbbf24;border-radius:var(--radius);padding:16px 20px;margin:14px 0 28px;font-size:14px;color:#713f12;line-height:1.85;display:flex;gap:12px;align-items:flex-start}.legacy-content .plain-talk .pt-icon {flex-shrink:0;font-size:18px;line-height:1.5}.legacy-content .plain-talk b {color:#92400e}.legacy-content .plain-talk .pt-tag {font-weight:800;color:#b45309}

.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)}