.challenge-shell{--challenge-ink:#171a20;--challenge-muted:#656b76;--challenge-line:#e3e5e9;--challenge-soft:#f6f6f3;--challenge-accent:#d9ff57;max-width:1180px;margin:0 auto;padding:0 24px 88px;color:var(--challenge-ink)}
.challenge-hero{padding:78px 0 44px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);gap:44px;align-items:end;border-bottom:1px solid var(--challenge-line)}
.challenge-kicker{font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#545a65;margin-bottom:18px}.challenge-hero h1{font-size:clamp(42px,6vw,78px);line-height:.97;letter-spacing:-.055em;margin:0 0 24px;max-width:820px}.challenge-hero h1 span{display:block;color:#5b616d}.challenge-hero p{font-size:18px;line-height:1.72;color:var(--challenge-muted);max-width:760px;margin:0}.challenge-hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.challenge-primary,.challenge-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border-radius:999px;font-weight:800;text-decoration:none;border:1px solid #1f232b;transition:transform .18s ease,box-shadow .18s ease}.challenge-primary{background:#20242c;color:#fff}.challenge-primary:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(0,0,0,.12)}.challenge-secondary{background:#fff;color:#1f232b}.challenge-hero-note{background:var(--challenge-soft);padding:24px;border-radius:22px}.challenge-hero-note strong{display:block;font-size:15px;margin-bottom:9px}.challenge-hero-note p{font-size:14px;line-height:1.65}.challenge-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--challenge-line);margin:34px 0 0;border:1px solid var(--challenge-line);border-radius:18px;overflow:hidden}.challenge-stat{background:#fff;padding:18px 20px}.challenge-stat strong{display:block;font-size:26px;letter-spacing:-.04em}.challenge-stat span{display:block;color:var(--challenge-muted);font-size:13px;margin-top:4px}.challenge-section{padding:54px 0 0}.challenge-section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:24px}.challenge-section-head span{font-size:12px;font-weight:800;letter-spacing:.14em;color:#707682}.challenge-section-head h2{font-size:32px;letter-spacing:-.035em;margin:7px 0 0}.challenge-section-head p{max-width:520px;color:var(--challenge-muted);line-height:1.65;margin:0}.challenge-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.challenge-card{position:relative;border:1px solid var(--challenge-line);border-radius:24px;padding:26px;background:#fff;min-height:300px;display:flex;flex-direction:column;overflow:hidden}.challenge-card::after{content:"";position:absolute;width:140px;height:140px;border-radius:50%;background:var(--challenge-accent);right:-72px;top:-76px;opacity:.7}.challenge-card-top,.challenge-detail-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.challenge-pill{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--challenge-soft);font-size:12px;font-weight:800;color:#545a65}.challenge-pill.live{background:#ecffd1;color:#345000}.challenge-card h3{font-size:28px;line-height:1.08;letter-spacing:-.035em;margin:24px 0 12px;max-width:90%}.challenge-card p{font-size:15px;line-height:1.7;color:var(--challenge-muted);margin:0 0 24px}.challenge-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:auto}.challenge-tags span{font-size:12px;border:1px solid var(--challenge-line);border-radius:999px;padding:6px 9px;color:#555c68}.challenge-card-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--challenge-line);padding-top:18px;margin-top:20px}.challenge-card-foot strong{font-size:13px}.challenge-card-foot a{font-size:13px;font-weight:800;color:#171a20;text-decoration:none}.challenge-explainer{margin-top:54px;background:#20242c;color:#fff;border-radius:26px;padding:34px;display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.challenge-explainer article span{font-size:12px;color:#aeb5c2}.challenge-explainer h3{font-size:19px;margin:10px 0 8px}.challenge-explainer p{font-size:14px;line-height:1.65;color:#c6ccd6;margin:0}.challenge-breadcrumbs{padding:34px 0 18px;font-size:13px;color:var(--challenge-muted)}.challenge-breadcrumbs a{color:inherit}.challenge-detail-hero{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px;padding:38px 0 44px;border-bottom:1px solid var(--challenge-line)}.challenge-detail-hero h1{font-size:clamp(38px,5vw,64px);line-height:1.02;letter-spacing:-.05em;margin:20px 0 20px}.challenge-detail-hero .lead{font-size:18px;line-height:1.72;color:var(--challenge-muted);max-width:800px}.challenge-side-card{background:var(--challenge-soft);border-radius:22px;padding:24px;align-self:start}.challenge-side-card small{display:block;color:var(--challenge-muted);margin-bottom:6px}.challenge-side-card strong{display:block;font-size:24px;margin-bottom:18px}.challenge-side-card .challenge-primary{width:100%;box-sizing:border-box}.challenge-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;padding-top:42px}.challenge-block{padding-bottom:36px;margin-bottom:36px;border-bottom:1px solid var(--challenge-line)}.challenge-block h2{font-size:28px;letter-spacing:-.03em;margin:0 0 16px}.challenge-block p{font-size:16px;line-height:1.8;color:#4f5662}.challenge-checklist{display:grid;gap:10px;margin:18px 0 0;padding:0;list-style:none}.challenge-checklist li{padding:14px 16px;background:var(--challenge-soft);border-radius:14px;line-height:1.5}.challenge-sidebar{align-self:start;position:sticky;top:94px}.challenge-facts{border:1px solid var(--challenge-line);border-radius:20px;overflow:hidden}.challenge-fact{padding:16px 18px;border-bottom:1px solid var(--challenge-line)}.challenge-fact:last-child{border-bottom:0}.challenge-fact small{display:block;color:var(--challenge-muted);margin-bottom:5px}.challenge-fact strong{font-size:14px}.challenge-ip-note{font-size:12px;line-height:1.65;color:var(--challenge-muted);padding:16px;margin-top:14px;background:#fff8df;border-radius:14px}.challenge-build-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.challenge-build{border:1px solid var(--challenge-line);border-radius:18px;padding:20px}.challenge-build h3{margin:8px 0}.challenge-empty{border:1px dashed #c8ccd3;border-radius:20px;padding:36px;text-align:center;background:var(--challenge-soft)}.challenge-empty h3{font-size:22px;margin:0 0 8px}.challenge-empty p{color:var(--challenge-muted);margin:0 0 20px}.challenge-form-shell{max-width:860px;margin:0 auto;padding:54px 24px 90px}.challenge-form-head span{font-size:12px;font-weight:800;letter-spacing:.14em;color:#707682}.challenge-form-head h1{font-size:clamp(38px,5vw,62px);letter-spacing:-.045em;margin:12px 0 16px}.challenge-form-head p{font-size:17px;line-height:1.7;color:var(--challenge-muted)}.challenge-form{margin-top:34px;display:grid;gap:20px}.challenge-form label{display:grid;gap:8px;font-weight:800;font-size:14px}.challenge-form input,.challenge-form textarea,.challenge-form select{width:100%;box-sizing:border-box;border:1px solid #d6d9df;border-radius:14px;background:#fff;padding:14px 15px;font:inherit;color:#1f232b}.challenge-form textarea{min-height:150px;resize:vertical;line-height:1.6}.challenge-form .idea-input{font-size:21px;min-height:190px}.challenge-form small{font-weight:400;color:var(--challenge-muted);line-height:1.55}.challenge-form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.challenge-options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.challenge-option{display:flex!important;grid-template-columns:none!important;align-items:center;gap:10px!important;padding:14px 16px;border:1px solid var(--challenge-line);border-radius:14px;font-weight:600!important}.challenge-option input{width:auto}.challenge-form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px}.challenge-form-notice{padding:18px;border-radius:16px;background:#fff8df;font-size:13px;line-height:1.7;color:#5c5434}.challenge-beta-banner{margin-top:30px;padding:20px 22px;border:1px solid #dce1e6;border-radius:18px;background:#f8f9fa;font-size:13px;line-height:1.7;color:#535a66}.challenge-language-note{font-size:12px;color:var(--challenge-muted);margin-top:10px}
@media(max-width:820px){.challenge-shell{padding:0 16px 64px}.challenge-hero{grid-template-columns:1fr;padding-top:48px}.challenge-hero h1{font-size:46px}.challenge-grid,.challenge-build-grid{grid-template-columns:1fr}.challenge-explainer{grid-template-columns:1fr}.challenge-detail-hero,.challenge-detail-layout{grid-template-columns:1fr}.challenge-sidebar{position:static}.challenge-section-head{display:block}.challenge-section-head p{margin-top:10px}.challenge-form-row,.challenge-options{grid-template-columns:1fr}.challenge-stats{grid-template-columns:1fr}.challenge-card{min-height:0}.challenge-form-shell{padding:38px 16px 64px}}