:root{
  --navy:#1B2D5E; --deep:#0A1128; --blue:#4BBDE0; --blue-lt:#8ce0f9;
  --violet:#8b5cf6; --violet-lt:#c4b5fd; --gray:#8A9BAB;
  --on-deep:#F2F6FA; --on-muted:rgba(242,246,250,.62);
  --line:rgba(255,255,255,.12);
  --shell:min(1560px, calc(100% - 9vw));
  --nav-h:5.25rem;
  --font-display:"Outfit","Pretendard Variable",sans-serif;
  --font-body:"Pretendard Variable","Outfit",sans-serif;
  --font-mono:"Fira Code",ui-monospace,monospace;
  --ease:cubic-bezier(.22,1,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--deep);color:var(--on-deep);
  font-family:var(--font-body);font-weight:400;line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;word-break:keep-all;
}
h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.18;letter-spacing:-.02em;margin:0}
a{color:inherit;text-decoration:none}
.shell{width:var(--shell);margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 계측 라벨 — 관측 기기의 눈금자 같은 모노 캡션 */
.tag{
  font-family:var(--font-mono);font-size:.72rem;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--blue);
  display:inline-flex;align-items:center;gap:.65rem;
}
.tag::before{content:"";width:1.75rem;height:1px;background:currentColor;opacity:.65}

/* ── NAV ── */
.nav{
  position:fixed;inset:0 0 auto;z-index:60;height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(10,17,40,0);border-bottom:1px solid transparent;
  transition:background .4s var(--ease),border-color .4s var(--ease),backdrop-filter .4s;
}
.nav[data-stuck]{background:rgba(10,17,40,.82);backdrop-filter:blur(18px) saturate(140%);border-bottom-color:var(--line)}
.nav .shell{display:flex;align-items:center;justify-content:space-between;gap:2rem}
.brand{display:flex;align-items:center;gap:.75rem}
.brand img{height:2rem;width:auto;display:block}
.nav-links{display:flex;gap:2.25rem;font-size:.9rem;letter-spacing:.01em}
.nav-links a{color:var(--on-muted);transition:color .25s}
.nav-links a:hover{color:var(--on-deep)}
.nav-cta{
  display:inline-flex;align-items:center;height:2.75rem;padding-inline:1.5rem;
  border:1px solid rgba(255,255,255,.45);border-radius:999px;font-size:.9rem;
  transition:background .3s var(--ease),color .3s var(--ease),border-color .3s;
}
.nav-cta:hover{background:var(--on-deep);color:var(--deep);border-color:var(--on-deep)}
.nav-burger{display:none;background:none;border:0;color:inherit;padding:.5rem;cursor:pointer}

/* ── HERO ── */
.hero{
  position:relative;isolation:isolate;min-height:100svh;padding-top:var(--nav-h);
  display:flex;flex-direction:column;overflow:hidden;
  background-image:radial-gradient(ellipse 120% 90% at 50% 28%, var(--navy), var(--deep) 68%);
}
.hero-media{position:absolute;inset:0;z-index:-20;opacity:.68}
.hero-media video{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity 1s ease-in-out;
}
.hero-scrim{
  position:absolute;inset:0;z-index:-10;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,10,20,.58) 0%,rgba(5,10,20,.32) 42%,rgba(10,17,40,.88) 100%);
}
/* 관측 격자 — 배경 위에 얇게 깔리는 좌표계 */
.hero-grid{
  position:absolute;inset:0;z-index:-10;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:min(14vw,180px) min(14vw,180px);
  mask-image:radial-gradient(ellipse 75% 60% at 50% 40%,#000 30%,transparent 78%);
}
.hero-body{flex:1;display:flex;flex-direction:column;justify-content:center;padding-block:clamp(3rem,7vh,7rem)}
@media (max-height:820px){.hero-body{padding-block:2.25rem}}

.hero-copy{display:grid}
.hero-slide{
  grid-area:1/1;transition:opacity .8s ease-in-out,transform .8s var(--ease);
  opacity:0;transform:translateY(14px);
}
.hero-slide[data-on]{opacity:1;transform:none}
.hero-slide .kicker{
  font-family:var(--font-mono);font-size:clamp(.72rem,1.1vw,.82rem);
  letter-spacing:.24em;text-transform:uppercase;color:var(--blue-lt);margin:0 0 1.35rem;
}
.hero-slide .headline{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2.1rem,6.2vw,4.6rem);line-height:1.1;letter-spacing:-.03em;
  max-width:22ch;margin:0;
}
.hero-slide .headline em{
  font-style:normal;
  background:linear-gradient(100deg,var(--blue) 0%,var(--violet-lt) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-slide .sub{
  margin:1.75rem 0 0;max-width:44ch;color:var(--on-muted);
  font-size:clamp(1rem,1.6vw,1.19rem);line-height:1.85;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:2.75rem}
.btn{
  display:inline-flex;align-items:center;gap:.7rem;height:3.5rem;padding-inline:2rem;
  border-radius:999px;font-size:1rem;font-weight:500;
  transition:transform .3s var(--ease),background .3s,color .3s,border-color .3s,box-shadow .3s;
}
.btn svg{width:1em;height:1em;fill:currentColor;transition:transform .3s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn-solid{background:var(--blue);color:#04121b;box-shadow:0 12px 40px -14px rgba(75,189,224,.85)}
.btn-solid:hover{background:var(--blue-lt);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.42);color:var(--on-deep)}
.btn-ghost:hover{background:var(--on-deep);color:var(--deep);border-color:var(--on-deep)}

/* 히어로 하단 — 3개 연구 클러스터 스트립 */
.hero-strip{border-top:1px solid var(--line)}
.hero-strip ul{
  list-style:none;margin:0;padding:1.5rem 0;
  display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;
}
.hero-strip a{display:block;transition:transform .35s var(--ease),opacity .35s}
.hero-strip a:hover{transform:translateY(-3px)}
.hero-strip .no{font-family:var(--font-mono);font-size:.72rem;color:var(--blue);letter-spacing:.16em}
.hero-strip .nm{font-family:var(--font-display);font-weight:500;font-size:clamp(.95rem,1.9vw,1.3rem);margin-top:.35rem}
.hero-strip .ds{font-size:.82rem;color:var(--on-muted);margin-top:.15rem}
@media (max-width:720px){
  .hero-strip .ds{display:none}
  .hero-strip ul{gap:.5rem}
}

/* ── SECTION 공통 ── */
.section{padding-block:clamp(6rem,13vh,11rem);position:relative}
.section-head{max-width:60ch}
.section-head h2{font-size:clamp(1.9rem,4vw,3.2rem);margin-top:1.5rem;letter-spacing:-.03em}
.section-head p{color:var(--on-muted);margin:1.5rem 0 0;font-size:clamp(1rem,1.5vw,1.13rem)}

/* 철학 — 인용 */
.creed{
  border-left:1px solid var(--blue);padding-left:clamp(1.5rem,4vw,3.5rem);
  margin-top:clamp(3rem,6vw,5rem);max-width:34ch;
}
.creed blockquote{
  margin:0;font-family:var(--font-display);font-weight:300;
  font-size:clamp(1.6rem,3.6vw,2.9rem);line-height:1.32;letter-spacing:-.02em;
}
.creed blockquote strong{font-weight:700;color:var(--blue-lt)}
.creed-note{margin-top:2rem;color:var(--on-muted);max-width:52ch}

/* 지표 */
.metrics{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:1.25rem;overflow:hidden;
  margin-top:clamp(3rem,6vw,5rem);
}
.metric{background:rgba(10,17,40,.72);padding:2.25rem 1.75rem}
.metric .v{font-family:var(--font-display);font-weight:700;font-size:clamp(2rem,4.4vw,3.1rem);line-height:1;letter-spacing:-.03em}
.metric .v span{color:var(--blue)}
.metric .l{margin-top:.9rem;font-size:.92rem;color:var(--on-muted)}
.metric .s{margin-top:.35rem;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--gray);text-transform:uppercase}

/* 연구 분야 */
.cluster{margin-top:clamp(3.5rem,7vw,6rem)}
.cluster-head{display:flex;align-items:baseline;gap:1.25rem;flex-wrap:wrap;padding-bottom:1.25rem;border-bottom:1px solid var(--line)}
.cluster-head h3{font-size:clamp(1.2rem,2.4vw,1.7rem);font-weight:500}
.cluster-head .cap{color:var(--gray);font-size:.92rem}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(272px,1fr));gap:1px;background:var(--line);margin-top:1px}
.card{
  background:var(--deep);padding:2.5rem 2rem 2.75rem;
  transition:background .45s var(--ease),transform .45s var(--ease);position:relative;
}
.card::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--blue),var(--violet));transition:width .55s var(--ease);
}
.card:hover{background:rgba(27,45,94,.42)}
.card:hover::after{width:100%}
.card .no{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;color:var(--gray)}
.card h4{font-family:var(--font-display);font-weight:500;font-size:1.24rem;margin:1.1rem 0 .9rem;letter-spacing:-.01em}
.card p{margin:0;color:var(--on-muted);font-size:.95rem;line-height:1.75}

/* 이네이블먼트 강조 블록 */
.enable{
  margin-top:clamp(3.5rem,7vw,6rem);border:1px solid var(--line);border-radius:1.5rem;
  padding:clamp(2.25rem,5vw,4rem);
  background:linear-gradient(135deg,rgba(27,45,94,.62),rgba(10,17,40,.4));
}
.enable h3{font-size:clamp(1.5rem,3.2vw,2.3rem);margin:1.25rem 0 0;letter-spacing:-.025em}
.enable p{color:var(--on-muted);margin:1.5rem 0 0;max-width:66ch}
.enable-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.5rem;margin-top:2.75rem}
.enable-steps li{list-style:none;padding-top:1.1rem;border-top:1px solid rgba(255,255,255,.18)}
.enable-steps .n{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;color:var(--blue)}
.enable-steps .t{margin-top:.6rem;font-family:var(--font-display);font-weight:500}
.enable-steps .d{font-size:.88rem;color:var(--on-muted);margin-top:.3rem}

/* 원칙 */
.principles{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:2.5rem;margin-top:clamp(3rem,6vw,5rem)}
.principle .n{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.2em;color:var(--blue)}
.principle h4{font-family:var(--font-display);font-weight:500;font-size:1.22rem;margin:1rem 0 .75rem}
.principle p{margin:0;color:var(--on-muted);font-size:.95rem;line-height:1.78}

/* CTA */
.cta{
  border-top:1px solid var(--line);
  background:radial-gradient(ellipse 90% 130% at 50% 100%,rgba(27,45,94,.85),transparent 70%);
}
.cta-inner{padding-block:clamp(5rem,11vh,8.5rem);text-align:center}
.cta-inner h2{font-size:clamp(2rem,5vw,3.6rem);margin-top:1.5rem;letter-spacing:-.03em}
.cta-inner p{color:var(--on-muted);margin:1.5rem auto 2.75rem;max-width:46ch}
.cta-actions{display:flex;gap:.85rem;justify-content:center;flex-wrap:wrap}

/* FOOTER */
footer{border-top:1px solid var(--line);padding-block:3.5rem;font-size:.88rem;color:var(--on-muted)}
.foot-top{display:flex;justify-content:space-between;gap:2rem;flex-wrap:wrap;align-items:flex-start}
.foot-corp{line-height:1.9}
.foot-corp strong{color:var(--on-deep);font-weight:600}
.foot-bottom{
  margin-top:2.5rem;padding-top:1.75rem;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gray);
}

/* 등장 애니메이션 */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0ms)}
[data-reveal][data-on]{opacity:1;transform:none}

@media (max-width:900px){
  .nav-links,.nav-cta{display:none}
  .nav-burger{display:block}
  .hero-strip ul{grid-template-columns:repeat(3,1fr)}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1;transform:none;transition:none}
  .hero-slide{transition:opacity .3s linear}
  *{animation-duration:.01ms!important}
}

/* ── CHAT WIDGET ── */
.chat-fab{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:70;
  width:3.6rem;height:3.6rem;border-radius:999px;border:0;cursor:pointer;
  background:linear-gradient(135deg,var(--blue),var(--violet));color:#04121b;
  display:grid;place-items:center;box-shadow:0 14px 40px -12px rgba(75,189,224,.8);
  transition:transform .3s var(--ease);
}
.chat-fab:hover{transform:translateY(-3px) scale(1.04)}
.chat-fab svg{width:1.5rem;height:1.5rem;stroke:#04121b;fill:none;stroke-width:2}
.chat-panel{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:calc(clamp(1rem,3vw,2rem) + 4.4rem);z-index:70;
  width:min(380px,calc(100vw - 2rem));height:min(540px,70vh);
  display:none;flex-direction:column;overflow:hidden;
  background:rgba(10,17,40,.96);backdrop-filter:blur(20px);
  border:1px solid var(--line);border-radius:1.1rem;box-shadow:0 30px 80px -20px rgba(0,0,0,.7);
}
.chat-panel[data-open]{display:flex}
.chat-head{display:flex;align-items:center;gap:.7rem;padding:1rem 1.1rem;border-bottom:1px solid var(--line)}
.chat-head .nm{font-weight:600;font-size:.95rem}
.chat-head .st{font-size:.75rem;color:var(--on-muted)}
.chat-head button{margin-left:auto;background:none;border:0;color:var(--on-muted);cursor:pointer;padding:.25rem}
.chat-log{flex:1;overflow-y:auto;padding:1.1rem;display:flex;flex-direction:column;gap:.85rem}
.msg{max-width:85%;padding:.7rem .95rem;border-radius:.9rem;font-size:.9rem;line-height:1.65;white-space:pre-wrap}
.msg.ai{background:rgba(255,255,255,.06);border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:.25rem}
.msg.me{background:var(--blue);color:#04121b;align-self:flex-end;border-bottom-right-radius:.25rem}
.chat-form{display:flex;gap:.5rem;padding:.85rem;border-top:1px solid var(--line)}
.chat-form input{
  flex:1;background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:.7rem;
  padding:.7rem .9rem;color:inherit;font-family:inherit;font-size:.9rem;
}
.chat-form input:focus{outline:none;border-color:var(--blue)}
.chat-form button{
  background:var(--blue);color:#04121b;border:0;border-radius:.7rem;padding:0 1.1rem;
  font-weight:600;cursor:pointer;font-family:inherit;
}
@media (prefers-reduced-motion:reduce){.chat-fab{transition:none}}

/* ── 서브페이지 헤더 (빌드 추가) ── */
.page-hero{
  position:relative;isolation:isolate;padding-top:var(--nav-h);overflow:hidden;
  background-image:radial-gradient(ellipse 120% 100% at 50% 0%, var(--navy), var(--deep) 72%);
  border-bottom:1px solid var(--line);
}
.page-hero video{
  position:absolute;inset:0;z-index:-20;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity 1s ease-in-out;
}
.page-hero .scrim{
  position:absolute;inset:0;z-index:-10;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,10,20,.62) 0%,rgba(5,10,20,.44) 55%,rgba(10,17,40,.9) 100%);
}

.page-hero .shell{padding-block:clamp(4.5rem,10vh,7.5rem)}
.page-hero h1{font-size:clamp(2.1rem,5vw,3.6rem);margin-top:1.4rem;letter-spacing:-.03em}
.page-hero p{color:var(--on-muted);margin:1.4rem 0 0;max-width:56ch;font-size:clamp(1rem,1.5vw,1.13rem)}
.nav-links a[aria-current="page"]{color:var(--on-deep)}
button.btn{border:0;background:none;cursor:pointer;font-family:inherit}
button.btn.btn-solid{background:var(--blue)}
button.btn.btn-ghost{border:1px solid rgba(255,255,255,.42)}
.plink{color:var(--blue-lt);font-size:.9rem;border-bottom:1px solid rgba(140,224,249,.35)}
.plink:hover{color:var(--on-deep);border-color:var(--on-deep)}
/* 제품 소개 페이지 */
.shot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:1.5rem;margin-top:clamp(2.5rem,5vw,4rem)}
.shot{border:1px solid var(--line);border-radius:1rem;overflow:hidden;background:#0d1530}
.shot img{width:100%;display:block}
.shot figcaption{padding:.85rem 1.1rem;font-size:.85rem;color:var(--on-muted);border-top:1px solid var(--line)}
.flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem;margin-top:clamp(2.5rem,5vw,4rem);padding:0}
.flow li{list-style:none;border-top:1px solid rgba(255,255,255,.18);padding-top:1.1rem}
.flow .n{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;color:var(--blue)}
.flow .t{margin-top:.6rem;font-family:var(--font-display);font-weight:500;font-size:1.1rem}
.flow .d{font-size:.9rem;color:var(--on-muted);margin-top:.4rem;line-height:1.7}
.prose{max-width:70ch;color:var(--on-muted);font-size:clamp(1rem,1.4vw,1.1rem);line-height:1.9;margin-top:clamp(2rem,4vw,3rem)}
.prose b{color:var(--on-deep)}
/* 문의 폼 */
.contact-form{margin-top:clamp(2.5rem,5vw,4rem);max-width:760px}
.contact-form label{display:block;font-size:.88rem;color:var(--on-muted);margin-top:1.4rem}
.contact-form input,.contact-form textarea{
  display:block;width:100%;margin-top:.5rem;box-sizing:border-box;
  background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:.7rem;
  padding:.85rem 1rem;color:var(--on-deep);font-family:inherit;font-size:.95rem;
}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--blue)}
.cf-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 1.5rem}
@media (max-width:640px){.cf-grid{grid-template-columns:1fr}}
.cf-hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.cf-actions{display:flex;align-items:center;gap:1.25rem;margin-top:2rem;flex-wrap:wrap}
.cf-status{margin:0;font-size:.9rem;color:var(--on-muted)}
.cf-status[data-ok]{color:#38d39f}
.cf-status[data-err]{color:#ff8296}
/* 홈 티저 그리드 */
.map-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:1.25rem;overflow:hidden;margin-top:clamp(3rem,6vw,5rem)}
@media (max-width:960px){.map-cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.map-cards{grid-template-columns:1fr}}
.map-cards a{background:var(--deep);padding:2.4rem 2rem;transition:background .4s var(--ease)}
.map-cards a:hover{background:rgba(27,45,94,.42)}
.map-cards .no{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;color:var(--blue)}
.map-cards h3{font-family:var(--font-display);font-weight:500;font-size:1.22rem;margin:1rem 0 .7rem}
.map-cards p{margin:0;color:var(--on-muted);font-size:.92rem;line-height:1.7}
/* ── 모바일 내비 드로어 ── */
@media (max-width:900px){
  .nav[data-menu-open] .nav-links{
    display:flex;flex-direction:column;gap:0;
    position:fixed;inset:var(--nav-h) 0 auto 0;padding:1rem 0 1.5rem;
    background:rgba(10,17,40,.97);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
  }
  .nav[data-menu-open] .nav-links a{padding:.95rem calc((100% - var(--shell))/2 + 4.5vw);font-size:1.05rem}
  .nav[data-menu-open]{background:rgba(10,17,40,.97)}
}
/* ── 카드 모바일 밀도 ── */
@media (max-width:640px){
  .card{padding:1.9rem 1.4rem 2.1rem}
  .map-cards a{padding:1.9rem 1.5rem}
  .enable{padding:1.8rem 1.4rem}
  .metrics,.map-cards{border-radius:1rem}
  .section{padding-block:4.5rem}
  .page-hero .shell{padding-block:3.5rem}
}