:root{
  --ivory:#eeeff1;--ivory-2:#e4e5e8;--paper:#ffffff;--ink:#1d1f22;--ink-soft:#484a4f;--muted:#6b6d72;
  --line:#d6d8db;--line-2:#e3e4e7;--gold:#3a3d44;--gold-d:#25272c;--bronze:#565961;--gold-l:#b9bcc2;
  --cream:#edeef1;--dark:#191b1f;
  --sans:"Pretendard",-apple-system,"Apple SD Gothic Neo",sans-serif;
  --rad:22px;--rad-s:16px;
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='150' height='150'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--ivory);color:var(--ink);-webkit-font-smoothing:antialiased;overflow-x:hidden;word-break:keep-all;line-height:1.65;letter-spacing:-.005em}
a{color:inherit;text-decoration:none;pointer-events:none;cursor:default} /* 디자인 시안 — 기본 비클릭 */
a.live{pointer-events:auto;cursor:pointer} /* 시안 내 이동(메인↔챌린지안내)만 클릭 */
em,i{font-style:normal}
.wrap{max-width:1240px;margin:0 auto;padding:0 40px}
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:linear-gradient(90deg,var(--gold),var(--gold-l));z-index:190}

/* HEADER */
.util{border-bottom:1px solid rgba(255,255,255,.14);transition:border-color .4s}
.util-in{max-width:1240px;margin:0 auto;display:flex;justify-content:flex-end;align-items:center;gap:18px;height:38px;padding:0 40px;font-size:12.5px;font-weight:600;color:rgba(244,239,227,.72)}
.nav{max-width:1240px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:70px;padding:0 40px}
.brand img{height:54px;width:auto;display:block;filter:drop-shadow(0 3px 10px rgba(0,0,0,.22))}
header.solid{background:rgba(255,255,255,.95);backdrop-filter:saturate(160%) blur(14px);box-shadow:0 1px 0 var(--line-2),0 10px 28px -22px rgba(30,30,30,.22)}

/* HERO */
.hero{position:relative;min-height:clamp(480px,62svh,620px);margin:122px 22px 22px;border-radius:34px;display:flex;flex-direction:column;justify-content:flex-end;overflow:hidden;background:var(--dark)}
.hero-media{position:absolute;inset:0;z-index:0;overflow:hidden}
.hero-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 55%}
.hero-scrim{position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(15,17,14,.5) 0%,rgba(15,17,14,.14) 32%,rgba(15,17,14,.34) 62%,rgba(15,17,14,.88) 100%)}
.hero .wrap{position:relative;z-index:4;padding-top:56px;padding-bottom:56px;width:100%}
.hero .eyebrow{font-weight:800;font-size:clamp(28px,3.4vw,44px);line-height:1.12;letter-spacing:-.035em;color:var(--cream)}
.hero h1{margin-top:14px;color:var(--cream);font-weight:500;font-size:clamp(18px,2.1vw,28px);line-height:1.35;letter-spacing:-.02em;text-shadow:0 10px 50px rgba(0,0,0,.45)}
.hero h1 b{font-weight:600;color:var(--gold-l)}
.hero .sub{margin-top:20px;max-width:600px;font-size:clamp(15px,1.6vw,18px);color:rgba(244,239,227,.9);line-height:1.75}
.btn-pri{display:inline-flex;align-items:center;gap:9px;background:var(--gold-l);color:#241a06;font-weight:700;font-size:15.5px;padding:15px 32px;border-radius:100px;transition:.28s cubic-bezier(.2,.8,.2,1)}
.btn-pri:hover{background:#cfd2d8;transform:translateY(-2px)}

/* REVEAL + kline */
.js [data-rv]{opacity:0;transform:translateY(40px);transition:opacity 1.05s cubic-bezier(.16,1,.3,1),transform 1.05s cubic-bezier(.16,1,.3,1)}
.kline i{display:inline-block;width:30px;height:1px;background:var(--gold);margin-right:13px;transition:width .9s cubic-bezier(.16,1,.3,1) .15s}
.js [data-rv] .kline i{width:0}
.js [data-rv].in .kline i{width:30px}

/* SECTION */
.section{position:relative;padding:clamp(48px,7vh,60px) 0;scroll-margin-top:120px}
.section.alt{background:var(--ivory-2)}
.shead{max-width:760px}
.shead.center{margin:0 auto;text-align:center}
.shead h2{margin-top:20px;font-weight:700;font-size:clamp(28px,4vw,50px);line-height:1.14;letter-spacing:-.035em;color:var(--ink)}
.shead p{margin-top:18px;font-size:clamp(15px,1.5vw,17px);color:var(--ink-soft);line-height:1.85}
/* 소개 (비대칭 스플릿) */
.intro{display:grid;grid-template-columns:1.04fr .96fr;gap:clamp(40px,6vw,96px);align-items:center}
.intro .lead .kline{margin-bottom:20px}
.intro .lead h2{font-weight:700;font-size:clamp(28px,3.6vw,46px);line-height:1.18;letter-spacing:-.035em;color:var(--ink)}
.intro .lead h2 em{font-weight:700;color:var(--gold-d)}
.intro .lead p{margin-top:22px;font-size:clamp(15px,1.5vw,17px);color:var(--ink-soft);line-height:1.9;max-width:520px}
.intro .lead p b{color:var(--bronze);font-weight:600}
.intro .figure{position:relative}
.intro .figure .fr{position:relative;overflow:hidden;border-radius:var(--rad);box-shadow:0 40px 70px -40px rgba(40,40,45,.5)}
.intro .figure img{width:100%;aspect-ratio:4/5;object-fit:cover;will-change:transform}
.intro .figure .tag{position:absolute;left:20px;bottom:20px;z-index:2;background:rgba(255,255,255,.94);color:var(--ink);font-size:12px;font-weight:700;letter-spacing:.04em;padding:10px 18px;border-radius:100px;box-shadow:0 8px 20px -10px rgba(0,0,0,.4)}
.intro .figure .tag span{color:var(--gold-d)}

/* 핵심 정보 — 헤어라인 스펙 스트립 (박스 아님) */
.spec{margin-top:60px;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.spec .c{padding:42px 30px;border-left:1px solid var(--line-2)}
.spec .c:first-child{border-left:0;padding-left:4px}
.spec .l{font-size:11.5px;font-weight:700;letter-spacing:.14em;color:var(--gold);text-transform:uppercase}
.spec .v{margin-top:14px;font-weight:700;font-size:clamp(26px,3vw,38px);letter-spacing:-.03em;color:var(--gold-d);line-height:1.05}
.spec .v.compact{font-size:clamp(16px,2.4vw,30px);letter-spacing:-.05em;white-space:nowrap}
.spec .v b{font-weight:800}
.spec .d{margin-top:10px;font-size:13.5px;color:var(--muted);line-height:1.6}
.spec .d small{display:block;margin-top:4px;font-size:inherit;color:inherit}
.brief-grid{margin-top:34px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.brief{background:var(--paper);border:1px solid var(--line-2);border-radius:var(--rad-s);padding:30px 32px}
.brief h3{font-size:19px;font-weight:800;letter-spacing:-.02em}
.brief ul{margin:18px 0 0;padding-left:20px;color:var(--ink-soft);font-size:14.5px;line-height:1.8}
.brief li+li{margin-top:8px}
.course-groups{margin-top:28px;color:var(--ink-soft);font-size:15px;line-height:1.9}
.course-groups p+p{margin-top:6px}
.course-groups+.btn-pri{margin-top:24px}

/* 참여·인증 — 고스트 넘버 에디토리얼 (박스 아님) */
.flow{margin-top:56px;display:grid;grid-template-columns:repeat(3,1fr)}
.flow .fstep{padding:8px 38px;border-left:1px solid var(--line)}
.flow .fstep:first-child{padding-left:0;border-left:0}
.flow .fstep:last-child{padding-right:0}
.flow .fstep .no{font-weight:800;font-size:clamp(44px,5.4vw,72px);letter-spacing:-.05em;color:var(--line);line-height:.9}
.method-icon{width:76px;height:76px;margin-top:22px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:rgba(255,255,255,.62);color:#56675d;box-shadow:0 18px 36px -30px rgba(29,31,34,.55)}
.method-icon svg{width:38px;height:38px;stroke:currentColor}
.flow .fstep h3{margin-top:18px;font-size:21px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.flow .fstep p{margin-top:14px;font-size:15px;color:var(--ink-soft);line-height:1.9}
.flow .fstep p b{color:var(--bronze);font-weight:600}
/* 경품 — 메달 엠블럼 스플릿 (박스 아님) */
.reward{margin-top:8px;display:grid;grid-template-columns:150px minmax(0,440px);gap:clamp(40px,4vw,54px);align-items:center;justify-content:center}
.medal{position:relative;width:min(150px,100%);margin:0 auto;aspect-ratio:124/262}
.medal svg{width:100%;height:100%;overflow:visible}
.medal .bar{fill:url(#agGrad)}
.medal .ring{stroke:var(--gold);stroke-width:2;stroke-dasharray:660;stroke-dashoffset:660}
.js [data-rv].in .medal .ring{transition:stroke-dashoffset 2s cubic-bezier(.4,0,.2,1) .3s;stroke-dashoffset:0}
.medal .inbd{fill:none;stroke:var(--gold-l);stroke-width:1;opacity:.55}
.medal .shadow{fill:rgba(29,31,34,.08)}
.medal .yr{font-family:var(--sans);font-weight:700;font-size:30px;letter-spacing:.02em;fill:var(--gold-d);opacity:.85}
.reward .body h3{font-weight:700;font-size:clamp(24px,3vw,36px);letter-spacing:-.03em;color:var(--ink)}
.reward .body p{margin-top:20px;font-size:15.5px;line-height:1.9;color:var(--ink-soft)}
.reward .body p b{color:var(--bronze);font-weight:600}
.reward .body .pill{margin-top:22px;font-size:12.5px;color:var(--muted)}
.sponsor-prizes{margin-top:56px;background:var(--paper);border:1px solid var(--line-2);border-radius:22px;padding:40px 44px}
.sp-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.sp-head h3{font-weight:800;font-size:clamp(20px,2.2vw,26px);letter-spacing:-.02em;color:var(--ink)}
.sp-head p{font-size:14px;color:var(--ink-soft)}
.sp-grid{margin:28px 0 0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.sp-grid li{display:flex;align-items:center;gap:14px;background:var(--ivory);border:1px solid var(--line-2);border-radius:14px;padding:16px 18px}
.sp-grid svg{width:32px;height:32px;flex:none;fill:none;stroke:var(--bronze);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.sp-grid b{font-size:14.5px;font-weight:700;color:var(--ink)}
.sp-grid small{display:block;margin-top:2px;font-size:12px;font-weight:500;color:var(--muted)}
.sponsor-prizes>.pill{display:block;margin-top:22px;font-size:12.5px;color:var(--muted)}

/* CTA */
.cta{position:relative;text-align:center;padding:72px 40px;overflow:hidden;background:var(--dark);margin:22px;border-radius:34px}
.cta-media{position:absolute;inset:0;z-index:0}
.cta-media img{width:100%;height:100%;object-fit:cover;object-position:center 55%;opacity:.42}
.cta::before{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(20,22,19,.72),rgba(15,17,14,.86))}
.cta .glow{position:absolute;top:-30%;left:50%;transform:translateX(-50%);width:min(640px,96vw);height:640px;z-index:1;background:radial-gradient(circle,rgba(185,188,194,.16),transparent 62%);pointer-events:none;animation:breathe 5s ease-in-out infinite}
@keyframes breathe{0%,100%{opacity:.6;transform:translateX(-50%) scale(1)}50%{opacity:1;transform:translateX(-50%) scale(1.08)}}
.cta .inner{position:relative;z-index:2;max-width:640px;margin:0 auto}
.cta .eyebrow{font-weight:600;font-size:13.5px;color:var(--gold-l);letter-spacing:.24em;text-transform:uppercase}
.cta h2{margin-top:16px;font-weight:700;color:var(--cream);font-size:clamp(28px,4.2vw,52px);line-height:1.1;letter-spacing:-.035em}
.cta h2 em{font-weight:700;color:var(--gold-l)}
.cta p{margin:16px auto 0;max-width:500px;color:rgba(244,239,227,.78);font-size:16px;line-height:1.75}
.cta .btn-pri{margin-top:32px;font-size:16px;padding:16px 38px}

/* PARTNERS (시안1 이식 · 색감 시안3) */
.tiers{margin-top:52px;display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--rad-s);overflow:hidden}
.tier{background:var(--paper);display:grid;grid-template-columns:200px 1fr;align-items:center;gap:30px;padding:38px 44px}
.tier .lbl{font-size:12.5px;font-weight:700;letter-spacing:.16em;color:var(--gold-d);text-transform:uppercase}
.tier .lbl small{display:block;margin-top:6px;font-size:12px;font-weight:500;letter-spacing:0;color:var(--muted);text-transform:none}
.tier .logos{display:flex;flex-wrap:wrap;align-items:center;gap:16px 18px}
.tier .logos img{height:41px;width:auto;max-width:170px;object-fit:contain}
.tier.host .logos img{height:47px}
.tiers .logos{flex-wrap:nowrap;gap:10px}
.tiers .tier:last-child .logos img{height:28px;max-width:120px}

/* FOOTER */

.m-cta{display:none}

@media(max-width:960px){.chat-fab{bottom:90px}}
@media(max-width:960px){
  .sp-grid{grid-template-columns:repeat(2,1fr)}
  .gnb,.util-in .ext,.util-in .sep{display:none}
  .burger{display:block}
  .intro{grid-template-columns:1fr;gap:40px}.intro .figure{order:-1;max-width:480px}
  .spec{grid-template-columns:1fr 1fr}
  .brief-grid{grid-template-columns:1fr}
  .spec .c:nth-child(3){border-left:0;padding-left:4px}
  .spec .c:nth-child(-n+2){border-bottom:1px solid var(--line-2)}
  .flow{grid-template-columns:1fr;gap:36px}
  .flow .fstep{padding:0 0 36px;border-left:0;border-bottom:1px solid var(--line)}.flow .fstep:last-child{padding-bottom:0;border-bottom:0}
  .reward{grid-template-columns:1fr;gap:40px}
  .tier{grid-template-columns:1fr;gap:16px;padding:30px 30px}
  .tiers .tier:last-child .logos{flex-wrap:wrap}
  .m-cta{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:160;background:rgba(238,239,241,.96);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:11px 16px}
  .m-cta a{flex:1;text-align:center;background:#3f6b4f;color:#fff;font-size:15px;font-weight:700;padding:14px;border-radius:100px}
  body{padding-bottom:70px}
}
@media(max-width:560px){
  .section{padding:36px 0}
  .sp-grid{grid-template-columns:1fr}
  .sponsor-prizes{padding:28px 24px;margin-top:40px}
  .wrap{padding:0 22px}.util-in{padding:0 22px}.nav{padding:0 22px}
  .hero{margin:112px 10px 10px;border-radius:20px;min-height:clamp(420px,58svh,560px)}.cta{margin:10px;border-radius:20px}
  .spec{grid-template-columns:1fr 1fr}
  footer .ft,footer .copy{padding-left:22px;padding-right:22px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .cta .glow{animation:none}
  .js [data-rv]{opacity:1!important;transform:none!important;transition:none!important}
  .medal .ring{stroke-dashoffset:0!important}
}