.challenge-page .arena-back{display:inline-flex;align-items:center;min-height:38px;margin-bottom:14px;padding:0 12px;border:1px solid rgba(136,177,155,.15);border-radius:9px;background:rgba(8,21,14,.62)}
.arena-v2 .challenge-detail-v2>.challenge-hero-compact{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:20px;padding:28px}
.challenge-hero-copy>span{color:var(--ar-green);font-size:.66rem;font-weight:850;letter-spacing:.09em}
.challenge-hero-copy h1{margin:8px 0 0;font-size:clamp(2rem,4vw,3.55rem);line-height:1.03;letter-spacing:-.05em}
.challenge-hero-stats{display:grid;grid-template-columns:repeat(3,minmax(74px,1fr));gap:8px;grid-column:1/-1}
.challenge-hero-stats>div{display:grid;gap:4px;padding:12px 14px;border:1px solid rgba(136,177,155,.16);border-radius:12px;background:rgba(3,13,8,.34)}
.challenge-hero-stats strong{margin:0!important;color:#f1faf5;font-size:1.2rem;line-height:1}
.challenge-hero-stats small{color:#718a7d;font-size:.54rem;font-weight:850;letter-spacing:.1em}
.challenge-hero-compact .ctf-bookmark-action{align-self:start;margin:0!important}
.challenge-hero-compact .ctf-bookmark-action button{min-height:42px;margin:0;padding:0 15px;border-radius:10px}
.challenge-hero-compact .ctf-bookmark-action button span{color:#f2cc76;font-size:1rem;letter-spacing:0}
.challenge-hero-compact .ctf-bookmark-action button b{font:inherit}
.arena-v2 .challenge-learning-goal{margin:0 18px 18px;padding:20px;border-radius:14px;background:linear-gradient(145deg,rgba(49,233,129,.065),rgba(5,18,11,.38))}
.arena-v2 .challenge-learning-goal p{max-width:760px}

@media(max-width:620px){
  .challenge-page{width:calc(100% - 18px);padding-top:18px}
  .challenge-page .arena-back{margin:0 0 12px;font-size:.67rem}
  .arena-v2 .challenge-detail-v2>.challenge-hero-compact{grid-template-columns:minmax(0,1fr) auto;gap:14px;padding:20px 16px 16px}
  .challenge-hero-copy h1{font-size:clamp(1.85rem,9vw,2.55rem)}
  .challenge-hero-compact .ctf-bookmark-action button{width:42px;overflow:hidden;padding:0}
  .challenge-hero-compact .ctf-bookmark-action button b{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
  .challenge-hero-stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}
  .challenge-hero-stats>div{align-content:center;min-height:65px;padding:10px;text-align:center}
  .challenge-hero-stats strong{font-size:1.05rem}
  .challenge-hero-stats small{font-size:.48rem;letter-spacing:.06em}
  .arena-v2 .challenge-learning-goal{margin:0 10px 10px;padding:16px}
  .arena-v2 .challenge-learning-goal strong{font-size:1rem}
  .arena-v2 .challenge-learning-goal p{margin-bottom:0;font-size:.75rem;line-height:1.58}
  .arena-v2 .challenge-description{padding:22px 16px}
  .arena-v2 .challenge-description h2{font-size:1.35rem}
}