.challenge-body{min-height:100vh}.challenge-header .nav-wrap{min-height:86px}.challenge-shell{padding:58px 0 100px}.challenge-wrap{max-width:940px}.challenge-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px}.challenge-top .eyebrow{margin:0}.run-counter{color:#8f9cad;font-size:14px;border:1px solid var(--line);border-radius:999px;padding:8px 13px}.challenge-card{padding:38px}.challenge-card h1,.challenge-card h2{font-size:clamp(38px,5vw,66px);line-height:1.05;margin:16px 0 20px;letter-spacing:-.035em}.challenge-card .prompt{font-size:clamp(22px,2.4vw,31px);line-height:1.45;margin:28px 0;color:#f3f6fb}.choice-grid{display:grid;gap:12px;margin-top:28px}.choice{width:100%;border:1px solid var(--line);background:#111925;color:#eaf0f7;border-radius:18px;padding:18px 20px;text-align:left;font:inherit;cursor:pointer;display:flex;gap:15px;align-items:flex-start;transition:.18s}.choice:hover{border-color:rgba(83,200,223,.55);transform:translateY(-1px)}.choice .letter{width:30px;height:30px;border-radius:9px;background:#202b3d;display:grid;place-items:center;font-size:13px;font-weight:850;flex:0 0 auto}.choice.selected{border-color:rgba(155,124,255,.75);background:rgba(155,124,255,.10)}.choice.correct{border-color:rgba(98,213,148,.75);background:rgba(98,213,148,.10)}.choice.wrong{border-color:rgba(255,120,120,.6);background:rgba(255,120,120,.08)}.commit-row{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-top:24px}.commit-row .button{min-width:190px}.commit-note{color:#8491a4;font-size:13px}.explanation{margin-top:24px;padding:22px;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.025);color:#b5c0cf}.explanation strong{display:block;color:#fff;margin-bottom:7px}.progress-track{height:5px;background:#182130;border-radius:999px;overflow:hidden;margin:0 0 26px}.progress-track span{display:block;height:100%;background:linear-gradient(90deg,var(--violet),var(--cyan));transition:width .25s}.result-hero{text-align:center;padding:48px 34px}.result-hero .big-score{font-size:clamp(74px,12vw,130px);font-weight:900;line-height:.9;letter-spacing:-.06em;margin:20px 0}.result-hero p{color:#aab6c6;max-width:650px;margin:18px auto}.result-cells{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px 0}.result-cells div{border:1px solid var(--line);border-radius:18px;padding:18px}.result-cells span{display:block;color:#8491a4;font-size:12px;text-transform:uppercase;letter-spacing:.12em}.result-cells strong{display:block;font-size:25px;margin-top:4px}.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.timerline{display:flex;justify-content:space-between;align-items:center;color:#8f9cad;font-size:13px;margin-bottom:10px}.timerline b{color:#fff}.difficulty{color:var(--violet);font-weight:800}@media(max-width:700px){.challenge-shell{padding:34px 0 70px}.challenge-card{padding:24px}.challenge-top{align-items:flex-start}.commit-row{display:grid}.commit-row .button{width:100%}.result-cells{grid-template-columns:1fr}.result-actions{display:grid}.result-actions .button{width:100%}}