/* ===== Tokens ===== */
:root{
  --bg: #F5F6F7;
  --bg-warm: #ECEEF1;
  --ink: #1B1E24;
  --ink-soft: #5A616B;
  --line: #DEE1E6;
  --navy: #1F3A5F;
  --navy-deep: #122A44;
  --navy-pale: #E4EAF1;
  --max: 880px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:'Inter', sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;}
.wrap{max-width:var(--max); margin:0 auto; padding:0 28px;}

/* ===== Nav ===== */
header.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(245,246,247,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--max); margin:0 auto; padding:16px 28px;
  display:flex; align-items:center; justify-content:space-between;
}
.nav-name{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:18px;
  letter-spacing:-0.01em;
  text-decoration:none;
}
.nav-links{display:flex; gap:28px; list-style:none; margin:0; padding:0;}
.nav-links a{
  text-decoration:none;
  font-size:14px;
  font-weight:500;
  color:var(--ink-soft);
  position:relative;
  padding-bottom:3px;
}
.nav-links a:hover{color:var(--ink);}
.nav-links a.active{color:var(--ink);}
.nav-links a::after{
  content:"";
  position:absolute; left:0; bottom:-2px;
  width:0; height:2px; background:var(--navy);
  transition:width .2s ease;
}
.nav-links a:hover::after, .nav-links a.active::after{width:100%;}

/* ===== Hero (home) ===== */
section.hero{
  padding:88px 0 64px;
  border-bottom:1px solid var(--line);
}
.hero-grid{
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:56px;
  align-items:center;
}
h1.name{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:clamp(38px, 5vw, 56px);
  line-height:1.05;
  letter-spacing:-0.01em;
  margin:0 0 14px;
}
h1.name .kr-name{
  font-family:'Inter', sans-serif;
  font-weight:400;
  font-size:0.5em;
  color:var(--ink-soft);
  letter-spacing:0;
}
.role{
  font-size:17px;
  color:var(--ink-soft);
  margin:0 0 22px;
}
.role strong{color:var(--ink); font-weight:600;}
.hero-desc{
  font-size:15.5px;
  color:var(--ink-soft);
  max-width:46ch;
  margin:0 0 28px;
}
.pronounce-link{
  margin:-16px 0 28px;
}
.pronounce-link a{
  font-size:13.5px;
  font-weight:500;
  color:var(--navy);
  text-decoration:underline;
  text-decoration-color:var(--navy-pale);
}
.hero-links{display:flex; flex-wrap:wrap; gap:12px;}
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 18px;
  border-radius:2px;
  font-size:14px; font-weight:600;
  text-decoration:none;
  border:1px solid var(--ink);
  transition:all .15s ease;
  cursor:pointer;
  background:transparent;
}
.btn-primary{
  background:var(--navy); border-color:var(--navy-deep); color:#fff;
}
.btn-primary:hover{background:var(--navy-deep);}
.btn-ghost{
  background:transparent; color:var(--ink);
}
.btn-ghost:hover{background:var(--bg-warm);}

.hero-photo{
  position:relative;
  aspect-ratio:4/5;
  background:var(--bg-warm);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  overflow:hidden;
}
.hero-photo img{width:100%; height:100%; object-fit:cover; display:block;}
.hero-photo .tag{
  position:absolute; bottom:14px; left:14px;
  background:var(--navy);
  font-family:'IBM Plex Mono', monospace;
  font-size:11px; padding:4px 9px;
  border-radius:2px;
  color:#fff;
}

/* Two photos side by side (used on Bio hero) */
.hero-photo-duo{
  display:flex;
  gap:12px;
}
.hero-photo-duo .half{
  flex:1 1 0;
  aspect-ratio:4/5;
  border:1px solid var(--line);
  overflow:hidden;
  position:relative;
  background:var(--bg-warm);
}
.hero-photo-duo img{
  width:100%; height:100%; object-fit:cover; display:block;
}

/* ===== Page header (non-home pages) ===== */
section.page-hero{
  padding:64px 0 40px;
  border-bottom:1px solid var(--line);
}
h1.page-title{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:clamp(32px, 4vw, 44px);
  margin:0 0 12px;
  letter-spacing:-0.01em;
}
.page-sub{
  font-size:15.5px;
  color:var(--ink-soft);
  max-width:60ch;
  margin:0;
}

/* ===== Section shared ===== */
section{padding:64px 0;}
section + section{border-top:1px solid var(--line);}
.section-head{margin-bottom:32px;}
.section-num{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px; color:var(--navy); letter-spacing:.05em;
  display:block; margin-bottom:6px;
}
h2.section-title{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:30px;
  margin:0;
  letter-spacing:-0.01em;
}

/* ===== Bio text ===== */
.bio-text p{
  font-size:15.5px;
  color:#3a3d42;
  max-width:68ch;
  margin:0 0 16px;
}
.bio-text a{color:var(--navy); text-decoration:underline; text-decoration-color:var(--navy-pale);}

.interest-list{
  list-style:none; margin:24px 0 0; padding:0;
  display:grid; gap:10px; max-width:68ch;
}
.interest-list li{
  font-size:14.5px; color:#3a3d42;
  padding:12px 16px;
  background:var(--bg-warm);
  border:1px solid var(--line);
  border-left:3px solid var(--navy);
}

/* ===== CV page ===== */
.cv-box{
  display:flex; align-items:center; justify-content:space-between;
  gap:20px; flex-wrap:wrap;
  padding:24px 28px;
  background:var(--bg-warm);
  border:1px solid var(--line);
  margin-bottom:32px;
}
.cv-box .cv-info{font-size:14px; color:var(--ink-soft);}
.cv-box .cv-info strong{display:block; color:var(--ink); font-size:16px; font-family:'Fraunces', serif; margin-bottom:4px;}
.cv-actions{display:flex; gap:10px; flex-wrap:wrap;}

.mobile-cv-note{
  display:none;
  font-size:13.5px;
  color:var(--ink-soft);
  margin:-16px 0 20px;
}

.cv-viewer{
  width:100%;
  height:80vh;
  border:1px solid var(--line);
  background:var(--bg-warm);
}

.cv-snapshot{
  margin-top:40px;
  display:grid;
  gap:24px;
}
.cv-block h3{
  font-family:'Fraunces', serif;
  font-size:16px;
  margin:0 0 12px;
  font-weight:600;
}
.cv-row{
  display:grid;
  grid-template-columns:110px 1fr;
  gap:16px;
  font-size:14px;
  color:#3a3d42;
  padding:10px 0;
  border-bottom:1px solid var(--line);
}
.cv-row:last-child{border-bottom:none;}
.cv-row .yr{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px; color:var(--navy);
}
.cv-row .what strong{display:block; color:var(--ink); font-weight:600; margin-bottom:2px;}
.cv-row .what span{color:var(--ink-soft); font-size:13px;}
.cv-courses{
  list-style:disc;
  margin:8px 0 0;
  padding-left:18px;
  display:grid;
  gap:3px;
}
.cv-courses li{
  color:var(--ink-soft);
  font-size:12.5px;
}

/* ===== Publications ===== */
.pub-list{list-style:none; margin:0; padding:0;}
.pub-item{
  display:grid;
  grid-template-columns:64px 1fr;
  gap:18px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.pub-item:first-child{padding-top:0;}
.pub-year{
  font-family:'IBM Plex Mono', monospace;
  font-size:14px; color:var(--navy); font-weight:500;
  padding-top:2px;
}
.pub-title{font-size:15.5px; font-weight:600; margin:0 0 5px; line-height:1.4;}
.pub-authors{font-size:13.5px; color:var(--ink-soft); margin:0 0 4px;}
.pub-authors strong{color:var(--ink);}
.pub-venue{font-size:13px; color:var(--ink-soft); font-style:italic; margin:0 0 8px;}
.pub-actions a{
  font-size:12.5px; font-weight:600; color:var(--navy);
  text-decoration:none; margin-right:16px;
}
.pub-actions a:hover{text-decoration:underline;}

/* ===== Contact ===== */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  max-width:68ch;
}
.contact-card{
  padding:24px;
  background:var(--bg-warm);
  border:1px solid var(--line);
}
.contact-card .label{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px; color:var(--ink-soft); text-transform:uppercase; letter-spacing:.05em;
  margin-bottom:10px; display:block;
}
.contact-card .value{
  font-size:16px; font-weight:600;
}
.contact-card a.value{text-decoration:none;}
.contact-card a.value:hover{color:var(--navy);}
.contact-addr{
  margin-top:28px;
  font-size:14px;
  color:var(--ink-soft);
  max-width:60ch;
  line-height:1.7;
}

/* ===== Footer ===== */
footer{
  padding:40px 0 56px;
}
.footer-row{
  display:flex; justify-content:space-between; align-items:center;
  flex-wrap:wrap; gap:16px;
  font-size:13px; color:var(--ink-soft);
}
.footer-links a{text-decoration:none; margin-left:18px; color:var(--ink-soft); font-weight:500;}
.footer-links a:hover{color:var(--navy);}

@media (max-width:720px){
  .hero-grid{grid-template-columns:1fr; gap:36px;}
  .hero-photo, .hero-photo-duo{order:-1; max-width:280px; margin:0 auto;}
  .pub-item{grid-template-columns:1fr;}
  .pub-year{padding-top:0;}
  .contact-grid{grid-template-columns:1fr;}
  .cv-row{grid-template-columns:1fr;}
  .nav-links{gap:16px;}
  .cv-viewer{display:none;}
  .mobile-cv-note{display:block;}
  .cv-box{flex-direction:column; align-items:flex-start;}
}

@media (max-width:480px){
  .nav-inner{flex-direction:column; align-items:flex-start; gap:10px;}
  .nav-links{flex-wrap:wrap; gap:6px 14px;}
  section.hero{padding:56px 0 40px;}
  section{padding:44px 0;}
  .wrap{padding:0 20px;}
}