/* QuantumTronix — 협력(Partnership). home.css + about.css 위에 협력 페이지 전용 */
.pt h3{margin:0 0 8px;font:400 clamp(19px,1.5vw,22px)/1.35 var(--f-display);color:var(--fg);letter-spacing:-.01em;word-break:keep-all}
html[lang^="en"] .pt h3{font-weight:500}

/* ---------- 첫 화면: 두 궤적 ---------- */
.pt-hero{background:radial-gradient(ellipse 55% 50% at 66% 46%,rgba(94,242,214,.05),transparent 70%),radial-gradient(ellipse 45% 45% at 40% 60%,rgba(255,180,94,.05),transparent 70%),var(--bg)}
.pt-orbit{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:pan-y}
.pt-hero-fade{background:linear-gradient(to bottom,rgba(3,4,9,0) 55%,rgba(3,4,9,.65) 85%,#030409 100%),linear-gradient(to right,rgba(3,4,9,.7) 0%,rgba(3,4,9,0) 42%)}
.pt-legend{position:absolute;z-index:2;right:var(--gx);bottom:calc(30px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;align-items:flex-end;gap:8px;font:400 10.5px var(--f-mono);letter-spacing:.2em;text-transform:uppercase;color:var(--fg60)}
.pt-legend span{display:flex;align-items:center;gap:10px}
.pt-legend i{width:26px;height:2px;border-radius:2px}
.pt-legend .a i{background:linear-gradient(90deg,transparent,#ffb45e)}
.pt-legend .b i{background:linear-gradient(90deg,transparent,#5ef2d6)}
.pt-legend em{font-style:normal!important;color:var(--fg40)!important;margin-top:6px}

/* ---------- 공통 섹션 ---------- */
.pt-sec{position:relative;max-width:1280px;margin:0 auto;padding:clamp(90px,16vh,170px) var(--gx);border-top:1px solid rgba(238,243,246,.06)}
.pt-head{margin-bottom:clamp(40px,7vh,80px)}

/* 스미어로 들어오기: 진행 방향으로 늘어났다가 제자리에 착 */
.ab-js .pt-sm{opacity:0;transform:translate3d(-90px,0,0) scaleX(1.32) skewX(-14deg);transform-origin:100% 50%;transition:opacity .5s ease,transform .9s cubic-bezier(.16,1.24,.3,1);transition-delay:calc(var(--k,0) * .16s)}
.ab-js .pt-sm.on{opacity:1;transform:none}

/* ---------- 01 협력 방식 ---------- */
.pt-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,1.8vw,24px)}
.pt-step{position:relative;padding:26px 22px 28px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,rgba(238,243,246,.03),rgba(238,243,246,0))}
.pt-step p{font-size:14.5px!important;margin:0!important}
.pt-sn{display:block;margin-bottom:22px;font:400 11px var(--f-mono);letter-spacing:.16em;color:var(--warm)}
.pt-step:last-child .pt-sn{color:var(--accent)}
/* 스크롤 속도만큼 뒤로 늘어나는 꼬리 */
.pt-tail{position:absolute;right:100%;top:30px;width:min(16vw,180px);height:2px;border-radius:2px;background:linear-gradient(90deg,transparent,rgba(255,190,110,.75));transform-origin:100% 50%;transform:scaleX(var(--sva,0));opacity:calc(var(--sva,0) * 1.4);pointer-events:none}
.pt-step:last-child .pt-tail{background:linear-gradient(90deg,transparent,rgba(94,242,214,.75))}
.ab-js .pt-step.pt-sm .pt-tail{animation:none}
.ab-js .pt-step.pt-sm.on .pt-tail{animation:ptTail .9s ease-out both;animation-delay:calc(var(--k,0) * .16s)}
@keyframes ptTail{0%{transform:scaleX(1);opacity:1}100%{transform:scaleX(var(--sva,0));opacity:calc(var(--sva,0) * 1.4)}}

/* ---------- 02 적용 분야: 흐르는 띠 ---------- */
.pt-apps{overflow:hidden;max-width:none;padding-left:0;padding-right:0}
.pt-apps .pt-head{max-width:1280px;margin-left:auto;margin-right:auto;padding:0 var(--gx)}
.pt-rows{display:flex;flex-direction:column;gap:clamp(10px,2vh,22px)}
.pt-row{overflow:hidden;white-space:nowrap}
.pt-track{display:inline-flex;gap:0;will-change:transform;transform:translate3d(var(--tx,0px),0,0)}
.pt-track span{display:inline-flex;align-items:center;gap:clamp(18px,2.4vw,40px);padding-right:clamp(18px,2.4vw,40px);font:400 clamp(34px,6vw,92px)/1.15 var(--f-display);letter-spacing:-.02em;color:var(--fg);transform:skewX(calc(var(--sv,0) * -16deg)) scaleX(calc(1 + var(--sva,0) * .3));transform-origin:50% 50%}
html[lang^="en"] .pt-track span{font-weight:500}
.pt-row.r2 .pt-track span{font:400 clamp(18px,2.4vw,34px)/1.4 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--fg40)}
.pt-row.r1 .pt-track span:nth-child(5n+1){color:var(--warm)}
.pt-track i{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 14px rgba(94,242,214,.7)}
.pt-row.r2 .pt-track i{width:6px;height:6px;background:var(--warm);box-shadow:none}

/* ---------- 03 협력 사례 ---------- */
.pt-case{grid-template-columns:minmax(0,6fr) minmax(0,6fr);border-top:1px solid rgba(238,243,246,.06)}
.pt-ph{margin:0;display:flex;flex-direction:column;gap:10px}
.pt-ph img{display:block;width:100%;height:auto;aspect-ratio:1600/1144;object-fit:cover;border-radius:8px;box-shadow:0 40px 70px rgba(0,0,0,.6),0 0 0 1px rgba(238,243,246,.08);filter:saturate(.92) brightness(.9)}
.pt-ph figcaption{font-size:12.5px;color:var(--fg40)}
.pt-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px}

/* ---------- 04 기술 적용 지원 ---------- */
.pt-panel{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(32px,5vw,80px);align-items:start;padding:clamp(28px,4vw,56px);border:1px solid rgba(255,190,110,.28);border-radius:20px;background:radial-gradient(ellipse 70% 80% at 0% 0%,rgba(255,180,94,.08),transparent 60%),radial-gradient(ellipse 60% 70% at 100% 100%,rgba(94,242,214,.06),transparent 60%),rgba(238,243,246,.015)}
.pt-panel h2{margin-bottom:22px}
.pt-need{font-size:13.5px!important;color:var(--fg40)!important;padding-left:14px;border-left:1px solid rgba(255,190,110,.4)}
.pt-incl{list-style:none;margin:0;padding:0}
.pt-incl li{display:grid;grid-template-columns:44px 1fr;gap:10px;padding:20px 0;border-top:1px solid var(--line)}
.pt-incl li:last-child{border-bottom:1px solid var(--line)}
.pt-incl b{font:400 11px/2 var(--f-mono);letter-spacing:.14em;color:var(--warm)}
.pt-incl p{margin:0!important;font-size:15px!important}

/* ---------- 휴대폰·태블릿 ---------- */
@media (max-width:1000px){
  .pt-steps{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
}
@media (max-width:900px){
  .pt-case,.pt-panel{grid-template-columns:minmax(0,1fr)}
  .pt-legend{display:none}
  .pt-tail{display:none}
}
@media (max-width:560px){
  .pt-steps{grid-template-columns:minmax(0,1fr)}
  .pt .ab-k{display:block;white-space:normal;line-height:1.8}
  .pt .ab-k b{margin-right:12px}
  .qth-part .grain{display:none}
}
@media (prefers-reduced-motion:reduce){
  .ab-js .pt-sm{opacity:1;transform:none;transition:none}
  .pt-track span{transform:none}
}