@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');
:root{--ink:#141b14;--muted:#687268;--line:#dce0d8;--lime:#c9ff33;--lime2:#e1ff7d;--warm:#f8f9f5;--forest:#243c2c;--max:1160px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Pretendard,-apple-system,BlinkMacSystemFont,'Noto Sans KR',sans-serif;background:#fff;color:var(--ink);line-height:1.6}a{text-decoration:none;color:inherit}button{font:inherit}a:focus-visible,button:focus-visible{outline:2px solid #366c2a;outline-offset:4px} .container{width:min(calc(100% - 64px),var(--max));margin:auto}.topbar{max-width:calc(var(--max) + 64px);margin:auto;padding:26px 32px;display:flex;align-items:center;justify-content:space-between;gap:28px}.logo{display:flex;flex-direction:column;line-height:1.2;white-space:nowrap}.logo strong{font-size:27px;letter-spacing:-1.4px;font-weight:850}.logo small{font-size:10px;letter-spacing:1.5px;font-weight:650;margin-top:5px}.nav{display:flex;align-items:center;gap:23px;font-size:14px;font-weight:640}.nav a:hover{color:#4e7a16}.nav-card{border:1px solid #162516;border-radius:40px;padding:8px 16px}.menu-button{display:none;background:none;border:0;font-weight:650;cursor:pointer}.hero-shell{width:min(calc(100% - 32px),1280px);margin:auto;background:var(--lime);border-radius:24px;overflow:hidden;position:relative;box-shadow:0 12px 25px rgba(63,83,0,.04)}.hero-fold{height:22px;background:var(--lime2);border-bottom:1px solid rgba(38,70,0,.1);border-radius:0 0 50% 50%;box-shadow:0 8px 12px -10px rgba(0,0,0,.25)}.hero-content{min-height:420px;padding:72px clamp(32px,6vw,90px) 48px;display:flex;justify-content:space-between;gap:30px;align-items:center}.eyebrow,.section-n{font-size:12px;font-weight:790;letter-spacing:2.2px}.hero-content h1{font-size:clamp(39px,5.35vw,74px);letter-spacing:-.056em;line-height:1.17;margin:20px 0 20px;font-weight:790}.hero-content h1 em{font-style:normal}.hero-description{font-size:clamp(17px,2vw,22px);line-height:1.65;letter-spacing:-.03em;margin:0}.hero-links{display:flex;gap:28px;margin-top:30px;flex-wrap:wrap}.hero-links a{border-bottom:1.5px solid #1b301c;padding-bottom:7px;font-size:15px;font-weight:720}.hero-links a span{margin-left:10px}.hero-right{align-self:stretch;min-width:23%;display:flex;flex-direction:column;align-items:flex-end;justify-content:space-between}.hero-right .glyph{font-size:clamp(100px,13vw,200px);line-height:1;color:rgba(255,255,255,.73);font-weight:200}.hero-right p{text-align:right;line-height:1.3;font-weight:650;font-size:14px}.hero-foot{padding:17px 65px;border-top:1px solid rgba(23,39,0,.2);display:flex;justify-content:space-between;gap:10px;font-size:11px;letter-spacing:1px;font-weight:650}.intro,.content-section{padding-top:108px;padding-bottom:108px}.section-head{display:flex;align-items:baseline;gap:28px;flex-wrap:wrap;margin-bottom:42px}.section-head h2{font-size:38px;letter-spacing:-.055em;margin:0;line-height:1.2}.section-head p{color:var(--muted);margin:0;font-size:16px}.section-n{color:#53832f}.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:100px}.body-big{font-size:clamp(21px,2.6vw,28px);letter-spacing:-.04em;line-height:1.56;margin:0 0 28px}.body-muted{font-size:16px;color:var(--muted);max-width:470px;line-height:1.9}.about-profile{border-top:2px solid var(--ink)}.about-profile h3{font-size:24px;margin:20px 0;letter-spacing:-.025em}.about-profile h3 small{display:block;margin-top:2px;font-size:12px;font-weight:500;color:var(--muted);letter-spacing:0}.about-profile dl{margin:0}.about-profile dl div{display:grid;grid-template-columns:90px 1fr;padding:15px 0;border-top:1px solid var(--line);gap:12px}.about-profile dt{font-size:13px;font-weight:730}.about-profile dd{font-size:14px;margin:0}.section-tint{background:var(--warm);padding:95px 0}.research-grid,.teaching-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.research-item{padding:31px;background:white;min-height:316px;display:flex;flex-direction:column;border:1px solid #e8ece4}.research-item>span,.research-item small{font-size:12px;letter-spacing:.7px;color:#507a32}.research-item h3{font-size:27px;line-height:1.26;letter-spacing:-.045em;margin:31px 0 18px}.research-item p{font-size:15px;line-height:1.9;color:#495349;margin:0 0 24px}.research-item small{margin-top:auto}.project-list{border-top:2px solid var(--ink)}.project-list article{display:grid;grid-template-columns:75px 1fr auto;gap:22px;align-items:center;border-bottom:1px solid var(--line);padding:25px 6px}.project-no{font-size:14px;color:#56834b;font-weight:750}.project-list h3{font-size:20px;letter-spacing:-.03em;margin:0 0 7px}.project-list p{font-size:14px;line-height:1.7;color:var(--muted);margin:0}.project-tag{border:1px solid var(--line);padding:6px 12px;border-radius:50px;color:#5d6d5d;font-size:12px;white-space:nowrap}.teaching-grid article{background:#fff;padding:30px;min-height:185px;border-left:3px solid #abdf5a}.teaching-grid p{color:#51764b;font-size:13px;margin:0 0 18px;font-weight:750}.teaching-grid h3{font-size:21px;letter-spacing:-.04em;margin:0 0 9px}.teaching-grid span{color:var(--muted);font-size:13px}.pub-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px}.pub-grid h3{font-size:21px;padding-bottom:17px;border-bottom:2px solid var(--ink);margin:0 0 8px}.pub-line,.book-entry{display:grid;grid-template-columns:65px 1fr;gap:15px;padding:18px 0;border-bottom:1px solid var(--line)}.pub-line>span,.book-entry>span{font-size:12px;color:#4c7849;font-weight:760}.pub-line p,.book-entry p{font-size:15px;margin:0}.pub-line small{display:block;color:var(--muted);margin-top:3px}.contact-section{background:var(--forest);color:#fff;padding:100px 0}.contact-inner{display:grid;grid-template-columns:1fr 1fr;gap:130px}.contact-inner h2{font-size:clamp(34px,4.8vw,59px);line-height:1.16;letter-spacing:-.05em;margin:24px 0}.contact-inner p{color:#c8d7c8;font-size:17px}.contact-links a{display:flex;gap:18px;align-items:baseline;border-bottom:1px solid #617362;padding:17px 0;font-size:18px;word-break:break-word}.contact-links small{width:94px;font-size:11px;letter-spacing:1.2px;color:#aee35e;flex-shrink:0}.footer{padding:24px 0 34px;display:flex;gap:30px;justify-content:space-between;align-items:center;font-size:12px;color:#5d685d}.footer a{font-size:17px;font-weight:850;color:var(--ink)}.footer a span{font-size:14px;margin-left:8px}.desktop-only{display:block}
@media (max-width:880px){.topbar{padding:22px 24px}.menu-button{display:block}.nav{display:none;position:absolute;z-index:10;left:15px;right:15px;top:84px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 30px rgba(20,25,20,.12);padding:18px;flex-direction:column;align-items:stretch;gap:0}.nav.open{display:flex}.nav a{padding:10px;border-bottom:1px solid var(--line)}.nav-card{border:0;border-radius:0}.container{width:min(calc(100% - 36px),var(--max))}.about-grid,.pub-grid,.contact-inner{grid-template-columns:1fr;gap:34px}.research-grid,.teaching-grid{grid-template-columns:1fr;gap:10px}.research-item{min-height:initial}.hero-content{min-height:350px;padding:64px 35px 42px}.hero-right{display:none}.hero-foot{padding:15px 32px}.intro,.content-section{padding:75px 0}.section-tint{padding:74px 0}.section-head{gap:14px;margin-bottom:30px}.contact-section{padding:75px 0}.contact-links a{font-size:16px}}
@media (max-width:540px){.hero-shell{width:calc(100% - 16px);border-radius:18px}.hero-content{padding:48px 24px 42px;min-height:365px}.hero-content h1{font-size:42px}.hero-description{font-size:17px}.hero-links{gap:18px}.hero-foot{font-size:9px;padding:13px 24px}.hero-foot span:last-child{display:none}.logo strong{font-size:23px}.project-list article{grid-template-columns:35px 1fr;gap:12px}.project-tag{grid-column:2;justify-self:start}.section-head{display:block}.section-head h2{margin:9px 0 13px}.desktop-only{display:none}.contact-inner h2{font-size:42px}.contact-links a{display:block}.contact-links small{display:block;margin-bottom:6px}.footer{flex-wrap:wrap}.about-profile dl div{grid-template-columns:67px 1fr}}

/* 2026 CHAE LAB unified site: clean folded envelope motif, no dark fasteners */
.topbar{position:relative;z-index:10;background:#fff}
.hero-shell{background:#ccff32}
.hero-fold{height:35px;background:#e6ff90;border-bottom:1px solid #c0e96c;border-radius:0 0 50% 50%;box-shadow:0 9px 19px -17px rgba(21,45,0,.9)}
.hero-content{padding-top:66px}
.hero-right .glyph{color:rgba(255,255,255,.63);line-height:0;opacity:.68}
.hero-signature{font-weight:790;font-size:18px;letter-spacing:-.01em;margin:26px 0 0}
.hero-signature span{font-weight:500;opacity:.73;font-size:12px;margin-left:8px}
.principles{margin-top:70px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid #cbd7ca;border-bottom:1px solid #cbd7ca}
.principles article{padding:28px 27px 30px;border-right:1px solid #dce4d7}
.principles article:first-child{padding-left:0}
.principles article:last-child{border:0;padding-right:0}
.principles span{font-size:11px;font-weight:800;letter-spacing:1.8px;color:#528037}
.principles h3{font-size:19px;letter-spacing:-.04em;margin:13px 0 12px}
.principles p{font-size:14px;color:#606d60;line-height:1.9;margin:0}
.research-grid{grid-template-columns:repeat(3,1fr)}
.research-item{min-height:290px}
.innovation-section{background:#f8fbeF;padding:100px 0}
.innovation-lead{border-block:2px solid #243b27;display:flex;gap:22px;align-items:center;flex-wrap:wrap;padding:28px 0;font-weight:850;letter-spacing:.045em;font-size:clamp(13px,2.3vw,25px)}
.innovation-lead b{color:#78b739}
.innovation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:38px}
.innovation-grid article{border-left:3px solid #a9d55d;padding:0 0 0 21px}
.innovation-grid h3{font-size:18px;margin:0 0 14px}
.innovation-grid p{font-size:14px;color:#5a6a56;line-height:1.9;margin:0}
.disclaimer{font-size:11px;color:#6b7568;margin-top:36px}
@media (max-width:1020px){.topbar{flex-wrap:wrap}.nav{gap:13px;font-size:12px}.nav-card{padding:7px 11px}}
@media (max-width:880px){.principles,.innovation-grid{grid-template-columns:1fr}.principles{margin-top:40px}.principles article,.principles article:first-child,.principles article:last-child{padding:20px 0;border-right:0;border-bottom:1px solid #dce4d7}.principles article:last-child{border-bottom:0}.research-grid{grid-template-columns:1fr}.innovation-section{padding:75px 0}}
@media (max-width:540px){.hero-signature span{display:block;margin-left:0;margin-top:2px}.hero-fold{height:25px}.innovation-lead{gap:10px;letter-spacing:0}.hero-content{padding-top:43px}}

/* Final confirmed envelope header: clear CHAE LAB wordmark ON the flap. No black fastener. */
.hero-shell{background:#cdff37;isolation:isolate}
.hero-fold{
  position:relative;z-index:1;height:142px;
  background:linear-gradient(178deg,#eaffad 0%,#e3ff87 70%,#d7f972 100%);
  border:0;border-radius:0;
  box-shadow:none;clip-path:polygon(0 0,100% 0,100% 45%,50% 100%,0 45%);
  display:flex;flex-direction:column;align-items:center;justify-content:flex-start;
  padding-top:19px;color:#151d0e;text-align:center;
}
.flap-brand{font-size:clamp(27px,3.6vw,46px);font-weight:850;letter-spacing:-.06em;line-height:1.05}
.flap-tagline{display:block;font-size:clamp(10px,1.1vw,13px);letter-spacing:.16em;font-weight:650;margin-top:9px}
.hero-content{padding-top:24px}
.hero-content .eyebrow{letter-spacing:1.5px;max-width:620px}
@media (max-width:880px){.hero-fold{height:119px;padding-top:17px}.hero-content{padding-top:13px}}
@media (max-width:540px){
  .hero-fold{height:106px;padding-top:15px;clip-path:polygon(0 0,100% 0,100% 55%,50% 100%,0 55%)}
  .flap-brand{font-size:30px}
  .flap-tagline{font-size:10px;letter-spacing:.08em;margin-top:5px}
  .hero-content{padding-top:10px}
  .hero-content .eyebrow{font-size:9px;letter-spacing:.65px}
}