[hidden]{display:none!important}.challenge-main{background:#f5f6fa;padding:52px 0 80px;min-height:75vh}.challenge-shell{max-width:1080px;margin:auto}.challenge-main h1{font-size:clamp(40px,5vw,64px);line-height:1.08;margin:18px 0 24px}.challenge-main h2{font-size:clamp(30px,3.5vw,42px)}.challenge-main h1:focus,.challenge-main h2:focus{outline:none}.challenge-kicker{color:#7450b2;font-size:11px;font-weight:800;letter-spacing:.17em}.challenge-intro{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}.challenge-intro .lede{font-size:18px;max-width:530px}.challenge-meta{display:flex;gap:20px;margin:30px 0;color:#536079;font-size:13px}.challenge-card{background:white;border:1px solid #dde2ee;border-radius:20px;padding:32px;box-shadow:0 16px 60px #15233d08}.challenge-art{background:#141f37;color:white;border-radius:24px;padding:38px;position:relative;overflow:hidden}.challenge-art:after{content:'';position:absolute;border:1px solid #7b69b841;border-radius:50%;width:380px;height:380px;right:-200px;top:-190px}.sample-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:28px 0}.sample-grid span{display:grid;place-items:center;aspect-ratio:1;border:1px solid #7485a75c;border-radius:50%;font-size:27px;background:#ffffff08}.sample-grid span:nth-child(3n+1){color:#d5afff}.challenge-art p{color:#bfc9de;margin-bottom:0}.challenge-art .challenge-kicker{color:#cfb5fb}.challenge-small{font-size:12px!important;color:#68758c;line-height:1.65}.challenge-rule{display:flex;gap:14px;padding:15px 0;border-top:1px solid #e4e8f0}.challenge-rule b{color:#7143ba}.challenge-rule p{margin:0;font-size:14px}.play-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.play-head h2{margin:8px 0 0}.text-button{background:transparent;border:0;color:#654096;text-decoration:underline;min-height:44px;padding:8px}.game-layout{display:grid;grid-template-columns:minmax(0,620px) 1fr;gap:28px;align-items:start}.game-board{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;padding:22px;background:#fff;border:1px solid #dce2ed;border-radius:18px;position:relative}.number{aspect-ratio:1;min-height:44px;min-width:0;border:1px solid #c4ccdd;border-radius:50%;background:#fff;color:#24314e;font-weight:650;font-size:20px;touch-action:manipulation;position:relative;z-index:1}.number:hover{background:#f2ebff;border-color:#8657c9}.number.found{background:#eef2f5;color:#65748b;border-style:dashed}.structured{background:linear-gradient(to right,transparent calc(50% - 1px),#a48ac9 calc(50% - 1px),#a48ac9 calc(50% + 1px),transparent calc(50% + 1px)),linear-gradient(to bottom,#faf7ff calc(50% - 1px),#a48ac9 calc(50% - 1px),#a48ac9 calc(50% + 1px),#f4f7ff calc(50% + 1px))}.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0}.stat{padding:15px;background:#f4f6fa;border-radius:12px}.stat span{display:block;font-size:11px;color:#627087}.stat strong{font-size:29px;font-variant-numeric:tabular-nums}.next-number{font-size:64px;font-weight:600;line-height:1.2;color:#6941a6}.game-side progress{width:100%;accent-color:#7649ba;height:8px}.game-feedback{font-size:13px;min-height:42px;margin:12px 0}.guide{font-size:13px;color:#604c83;background:#f3edfb;padding:14px;border-radius:10px}.reveal-layout{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:center}.quadrant-demo{display:grid;grid-template-columns:1fr 1fr;gap:2px;background:#bbaad4;border:2px solid #bbaad4;border-radius:16px;overflow:hidden;margin:28px 0}.quadrant-demo div{background:#f9f6fe;padding:24px 18px;min-height:140px}.quadrant-demo b{font-size:28px;color:#7446ae;display:block}.quadrant-demo span{font-size:12px;color:#536079}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0}.result-score{font-size:64px;color:#7046b1;font-weight:600;line-height:1.2}.result-score small{font-size:20px;color:#758198}.debrief{margin-top:28px;padding-top:24px;border-top:1px solid #dfe4ed}.debrief-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:24px 0}.debrief-grid h3{font-size:16px}.debrief-grid p{font-size:14px}.challenge-actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.noscript{padding:30px;background:#fff}.challenge-note{margin-top:28px}
@media(max-width:850px){.challenge-intro,.reveal-layout{grid-template-columns:1fr}.game-layout{grid-template-columns:1fr}.game-side{order:-1;padding:18px;display:grid;grid-template-columns:1fr 2fr;gap:8px 16px}.stats{margin:0;grid-template-columns:repeat(3,1fr)}.stat{padding:10px}.stat strong{font-size:24px}.next-number{font-size:40px}.game-side .progress-wrap,.game-feedback,.guide{grid-column:1/-1}.game-feedback{min-height:20px;margin:0}.guide{margin:0}.challenge-art{max-width:520px}.challenge-main{padding-top:28px}.debrief-grid{grid-template-columns:1fr;gap:8px}}
@media(max-width:500px){.challenge-main .container{width:calc(100% - 28px)}.challenge-card{padding:22px}.game-board{gap:7px;padding:12px}.number{font-size:17px}.challenge-meta{gap:13px;font-size:12px}.play-head{align-items:start}.play-head h2{font-size:29px}.game-side{padding:14px}.game-side .stats{gap:5px}.stat{padding:7px}.stat span{font-size:10px}.result-grid{gap:10px}.result-grid .challenge-card{padding:15px}.result-score{font-size:48px}.challenge-art{padding:26px}.quadrant-demo div{padding:18px 12px}.challenge-main .site-header{position:static}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.challenge-main *{transition:none!important;animation:none!important}}
@media(max-width:360px){.challenge-main .container{width:calc(100% - 16px)}.game-board{gap:4px;padding:6px}.number{min-width:44px}}