:root{
  --navy:#17263f; --navy-deep:#14223b; --cream:#f6f0e2; --white:#ffffff;
  --amber:#d99318; --amber-bright:#e9b54a; --muted:#6f6650; --line:#e6dcc6; --ink-soft:#33405a;
  --r1:#e23b2e; --r2:#ef7d22; --r3:#f0a92b; --r4:#43a546; --r5:#14a3a0; --r6:#2f6fed; --r7:#7a4fd0;
  --display:'Montserrat',sans-serif; --body:'Source Serif 4',Georgia,serif; --kr:'Noto Sans KR',sans-serif;
  --maxw:1080px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:var(--body);color:var(--navy);background:var(--white);line-height:1.65;font-size:18px;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:var(--display);line-height:1.15;}
a{color:inherit;}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
.kr{font-family:var(--kr);}

/* wordmark */
.wm{display:inline-flex;align-items:center;font-family:var(--display);font-weight:700;letter-spacing:.01em;line-height:1;text-decoration:none;color:inherit;}
.wm .o{height:.80em;width:.80em;margin:0 .045em;}
.wm .lab{font-weight:500;margin-left:.34em;font-size:.64em;align-self:flex-end;padding-bottom:.06em;}

/* nav */
header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;}
.nav-brand{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:inherit;}
.nav .wm{font-size:23px;color:var(--navy);}
.nav-pi{font-family:var(--display);font-size:.72rem;font-weight:500;color:var(--muted);letter-spacing:.01em;white-space:nowrap;}
.nav-links{display:flex;gap:28px;list-style:none;margin:0;padding:0;}
.nav-links a{font-family:var(--display);font-weight:600;font-size:.82rem;text-decoration:none;color:var(--navy);letter-spacing:.02em;padding:6px 0;position:relative;}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--amber);transition:right .25s ease;}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{right:0;}
.nav-links a[aria-current="page"]{color:var(--amber);}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--navy);margin:5px 0;transition:.25s;}

/* page header band (for inner pages) */
.page-head{background:var(--navy-deep);color:var(--cream);padding:130px 0 60px;}
.page-head .eyebrow{margin-bottom:14px;}
.page-head h1{font-size:clamp(34px,5vw,52px);font-weight:700;margin:0;}
.page-head p{color:#c9c2b2;max-width:60ch;margin:16px 0 0;font-size:1.08rem;}

/* hero */
.hero{position:relative;background:var(--navy-deep);color:var(--cream);overflow:hidden;padding:150px 0 96px;}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.7;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,var(--navy-deep) 28%,rgba(20,34,59,.78) 55%,rgba(20,34,59,.42) 100%);}
.hero-watermark{position:absolute;right:-90px;top:50%;transform:translateY(-50%);width:560px;max-width:70%;opacity:.07;pointer-events:none;z-index:1;}
.hero-inner{position:relative;max-width:760px;z-index:1;}
.hero .wm{font-size:clamp(54px,11vw,104px);color:var(--cream);}
.eyebrow{font-family:var(--display);font-weight:600;font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:var(--amber-bright);display:inline-flex;align-items:center;gap:12px;margin:0 0 26px;}
.eyebrow .dots{display:inline-flex;gap:5px;}
.eyebrow .dots i{width:8px;height:8px;border-radius:50%;display:inline-block;}
.hero-logo{width:min(780px,90vw);height:auto;display:block;margin-bottom:20px;margin-left:-12%;}
.hero-lead{font-size:clamp(20px,2.4vw,25px);max-width:620px;margin:30px 0 10px;color:#e9e2d2;}
.hero-kr{font-family:var(--kr);font-weight:400;color:#a9b0c0;letter-spacing:.01em;margin:0 0 36px;font-size:1rem;}
.hero-kr b{color:var(--amber-bright);font-weight:700;}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;}
.btn{font-family:var(--display);font-weight:600;font-size:.92rem;text-decoration:none;padding:13px 26px;border-radius:8px;transition:transform .15s ease,background .2s ease;display:inline-block;cursor:pointer;}
.btn-primary{background:var(--amber);color:var(--navy);}
.btn-primary:hover{background:var(--amber-bright);transform:translateY(-2px);}
.btn-ghost{border:1.5px solid rgba(246,240,226,.55);color:var(--cream);}
.btn-ghost:hover{border-color:var(--cream);transform:translateY(-2px);}

/* sections */
.section{padding:clamp(60px,8vw,100px) 0;}
.bg-cream{background:var(--cream);}
.bg-white{background:var(--white);}
.bg-navy{background:var(--navy-deep);color:var(--cream);}
section[id]{scroll-margin-top:80px;}
.sec-eyebrow{font-family:var(--display);font-weight:600;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--amber);display:flex;align-items:center;gap:11px;margin:0 0 18px;}
.sec-eyebrow i{width:9px;height:9px;border-radius:50%;background:var(--amber);display:inline-block;}
h2.sec-title{font-size:clamp(28px,4.2vw,42px);font-weight:700;margin:0 0 26px;max-width:20ch;}
.lead-text{font-size:clamp(18px,2vw,21px);max-width:64ch;color:var(--ink-soft);}
.section-link{display:inline-block;margin-top:30px;font-family:var(--display);font-weight:600;font-size:.92rem;color:var(--navy);text-decoration:none;border-bottom:2px solid var(--amber);padding-bottom:2px;}
.bg-navy .section-link{color:var(--cream);}

/* measure model make */
.mmm{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-top:50px;}
.mmm-step{position:relative;}
.mmm-step .tag{font-family:var(--display);font-weight:700;font-size:1.4rem;display:flex;align-items:center;gap:11px;margin:0 0 12px;}
.mmm-step .tag .dot{width:14px;height:14px;border-radius:50%;flex:none;}
.mmm-step p{margin:0;font-size:1rem;color:var(--ink-soft);}
.mmm-step .q{font-style:italic;color:var(--amber);display:block;margin-bottom:6px;}
.mmm-step:not(:last-child)::after{content:"\2192";position:absolute;top:2px;right:-22px;font-family:var(--display);color:var(--line);font-size:1.5rem;}

/* research pillars */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:46px;}
.pillars-2col{grid-template-columns:1fr 1fr;}
.pillar{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:transform .2s ease,box-shadow .2s ease;}
.pillar:hover{transform:translateY(-4px);box-shadow:0 14px 34px -18px rgba(23,38,63,.32);}
.pillar-wide{grid-column:1 / -1;}
.pillar-img{width:100%;display:block;height:auto;}
.pillar-body{padding:26px 26px 28px;}
.pillar-tag{font-family:var(--display);font-weight:700;font-size:1rem;letter-spacing:.06em;text-transform:uppercase;margin:0 0 12px;}
.pillars-2col .pillar-tag{font-size:1.2rem;}
.pillar .bar{width:42px;height:5px;border-radius:3px;margin-bottom:18px;}
.pillar h3{font-size:1.18rem;font-weight:700;margin:0 0 16px;line-height:1.25;}
.pillar ul{margin:0;padding-left:0;list-style:none;}
.pillar li{font-size:.97rem;color:var(--ink-soft);padding-left:20px;position:relative;margin-bottom:11px;line-height:1.5;}
.pillar li::before{content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;border-radius:50%;background:var(--amber);}

/* people */
.pi-card{display:flex;gap:34px;align-items:flex-start;background:var(--white);border:1px solid var(--line);border-radius:16px;padding:34px;margin-top:8px;flex-wrap:wrap;}
.avatar{width:200px;height:200px;border-radius:20%;background:var(--cream);border:1px solid var(--line);flex:none;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.avatar svg{width:62px;height:62px;opacity:.7;}
.avatar img{width:100%;height:100%;object-fit:cover;}
.pi-info{flex:1;min-width:260px;}
.pi-info .role{font-family:var(--display);font-weight:600;color:var(--amber);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 6px;}
.pi-info h3{font-size:1.6rem;margin:0 0 4px;}
.pi-info .han{font-family:var(--kr);color:var(--muted);margin:0 0 14px;font-size:1rem;}
.pi-info p.bio{margin:0 0 18px;font-size:1.02rem;color:var(--ink-soft);max-width:64ch;}
.pi-cv{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.pi-cv h4{font-family:var(--display);font-size:.74rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin:0 0 8px;}
.pi-cv ul{margin:0;padding-left:0;list-style:none;}
.pi-cv li{font-size:.92rem;color:var(--ink-soft);margin-bottom:6px;line-height:1.4;}
.pi-cv a{color:var(--navy);border-bottom:2px solid var(--amber);text-decoration:none;font-family:var(--display);font-weight:600;font-size:.88rem;}

.subhead{font-family:var(--display);font-weight:700;font-size:1.4rem;margin:54px 0 26px;}
.members{display:grid;grid-template-columns:repeat(4,1fr);gap:26px 22px;}
.member{text-align:center;}
.member .avatar{width:150px;height:150px;margin:0 auto 14px;}
.member .avatar svg{width:44px;height:44px;}
.member .mname{font-family:var(--display);font-weight:600;font-size:1rem;margin:0;}
.member .mrole{font-size:.88rem;color:var(--amber);margin:3px 0 0;font-family:var(--display);font-weight:500;}
.member .medu{font-size:.86rem;color:var(--muted);margin:5px 0 0;line-height:1.4;}
.alumni-list{display:flex;flex-wrap:wrap;gap:10px 14px;margin-top:8px;}
.alumni-list span{font-size:.98rem;color:var(--ink-soft);}
.alumni-list span:not(:last-child)::after{content:"·";margin-left:14px;color:var(--line);}

/* publications */
.pub-legend{font-size:.9rem;color:var(--muted);margin:0 0 8px;}
.pub-year{font-family:var(--display);font-weight:700;font-size:1.3rem;color:var(--amber);margin:36px 0 6px;}
.pub{padding:18px 0;border-top:1px solid var(--line);}
.pub .ptitle{font-weight:600;font-size:1.08rem;margin:0 0 5px;line-height:1.4;}
.pub .pauthors{font-size:.97rem;color:var(--ink-soft);margin:0 0 4px;}
.pub .pauthors strong{color:var(--navy);}
.pub .pvenue{font-size:.96rem;color:var(--muted);font-style:italic;margin:0 0 8px;}
.pub .plinks a{font-family:var(--display);font-weight:600;font-size:.82rem;text-decoration:none;color:var(--navy);border:1px solid var(--line);border-radius:6px;padding:4px 12px;margin-right:8px;transition:.15s;display:inline-block;}
.pub .plinks a:hover{background:var(--amber);border-color:var(--amber);}
.pub .pnote{font-size:.86rem;color:var(--amber);margin:10px 0 0;}

/* news */
.news-item{display:flex;gap:24px;padding:20px 0;border-top:1px solid var(--line);}
.news-item .date{font-family:var(--display);font-weight:600;color:var(--amber);font-size:.86rem;min-width:78px;flex:none;padding-top:2px;letter-spacing:.01em;}
.news-item .what{margin:0;font-size:1rem;color:var(--ink-soft);}
.news-item .what p{margin:0 0 6px;}
.news-item .what a{color:var(--navy);border-bottom:1px solid var(--amber);text-decoration:none;}
/* news media */
.news-media{margin-top:12px;}
.news-yt{position:relative;display:block;width:100%;max-width:480px;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:#000;text-decoration:none;}
.news-yt img{width:100%;height:100%;object-fit:cover;display:block;transition:opacity .2s;}
.news-yt:hover img{opacity:.75;}
.yt-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:3rem;color:#fff;text-shadow:0 2px 12px rgba(0,0,0,.6);pointer-events:none;}
.news-photos{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}
.news-photos img{width:calc(50% - 4px);max-width:240px;border-radius:8px;object-fit:cover;aspect-ratio:4/3;cursor:pointer;transition:opacity .2s;}
.news-photos img:only-child{width:100%;max-width:480px;aspect-ratio:16/9;}
.news-photos img:hover{opacity:.88;}
/* lightbox */
.lbx{display:none;position:fixed;inset:0;z-index:200;background:rgba(10,18,30,.88);align-items:center;justify-content:center;padding:20px;}
.lbx.open{display:flex;}
.lbx img{max-width:min(92vw,900px);max-height:88vh;border-radius:10px;box-shadow:0 8px 48px rgba(0,0,0,.6);}
.lbx-close{position:fixed;top:18px;right:22px;background:none;border:none;color:#fff;font-size:2rem;cursor:pointer;line-height:1;opacity:.8;}
.lbx-close:hover{opacity:1;}
.lbx-prev,.lbx-next{position:fixed;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.15);border:none;color:#fff;font-size:1.6rem;padding:10px 14px;border-radius:6px;cursor:pointer;line-height:1;}
.lbx-prev{left:14px;} .lbx-next{right:14px;}
.lbx-prev:hover,.lbx-next:hover{background:rgba(255,255,255,.28);}

/* join */
.join-inner{text-align:center;max-width:680px;margin:0 auto;}
.bg-navy .sec-eyebrow{color:var(--amber-bright);}
.bg-navy .sec-eyebrow i{background:var(--amber-bright);}
.bg-navy h2.sec-title{color:var(--cream);margin-left:auto;margin-right:auto;}
.join-inner p{color:#d8d2c4;font-size:1.1rem;margin:0 auto 30px;max-width:56ch;}

/* footer */
footer{background:#0f1a2e;color:#aeb6c6;padding:54px 0 32px;font-size:.92rem;}
.foot-top{display:flex;justify-content:space-between;gap:34px;flex-wrap:wrap;align-items:flex-start;}
footer .wm{font-size:30px;color:var(--cream);margin-bottom:14px;}
.foot-col h4{font-family:var(--display);font-size:.78rem;letter-spacing:.13em;text-transform:uppercase;color:#7f8aa3;margin:0 0 10px;font-weight:600;}
.foot-col p,.foot-col a,.foot-col span{margin:0 0 5px;color:#aeb6c6;text-decoration:none;display:block;}
.foot-col a:hover{color:var(--cream);}
.foot-bottom{border-top:1px solid #24314a;margin-top:36px;padding-top:20px;font-size:.82rem;color:#6f7a92;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;}
.foot-kaist-logo{height:28px;width:auto;opacity:1;}

/* reveal */
.reveal{opacity:1;transform:none;}
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease;}
.js .reveal.in{opacity:1;transform:none;}

/* responsive */
@media(max-width:860px){
  .mmm{grid-template-columns:1fr;gap:32px;}
  .mmm-step:not(:last-child)::after{display:none;}
  .pillars{grid-template-columns:1fr;}
  .pillar-wide{grid-column:auto;}
  .members{grid-template-columns:repeat(3,1fr);}
  .pi-cv{grid-template-columns:1fr;}
}
@media(max-width:680px){
  body{font-size:17px;}
  .nav-links{position:fixed;inset:64px 0 auto 0;background:var(--white);border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px 0;transform:translateY(-130%);transition:transform .3s ease;box-shadow:0 18px 30px -22px rgba(0,0,0,.3);}
  .nav-links.open{transform:none;}
  .nav-links li{padding:0 28px;}
  .nav-links a{display:block;padding:14px 0;border-bottom:1px solid var(--line);}
  .nav-links li:last-child a{border-bottom:0;}
  .nav-toggle{display:block;}
  .pi-card{flex-direction:column;align-items:center;text-align:center;}
  .pi-info p.bio{margin-left:auto;margin-right:auto;}
  .members{grid-template-columns:repeat(2,1fr);}
  .news-item{flex-direction:column;gap:4px;}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .js .reveal{transition:none;opacity:1;transform:none;}
}