:root{
  --ink:#222;
  --muted:#666;
  --paper:#fff;
  --bg:#efefef;
  --coral:#ff6f61;
  --yellow:#f6d155;
  --line:#ededed;
  --sidebar:300px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--muted);
  background:var(--bg);
  font-family:Inter,"Noto Sans KR",sans-serif;
  line-height:1.65;
}
a{color:inherit}
.page{min-height:100vh}
.sidebar{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--sidebar);
  overflow:auto;
  background:#222;
  z-index:20;
}
.profile-art{padding:24px 22px 10px;background:#222}
.profile-art img{
  display:block;
  width:100%;
  aspect-ratio:4/5;
  object-fit:cover;
  object-position:45% 34%;
  border-radius:2px
}
.nav{padding:18px 0 90px}
.nav a{
  display:flex;align-items:center;justify-content:space-between;
  padding:9px 30px;color:#bdbdbd;text-decoration:none;
  font-weight:500;transition:.2s;
}
.nav a:hover,.nav a.active{color:var(--coral);padding-left:36px}
.nav a span{color:var(--coral)}
.social{
  position:fixed;left:0;bottom:0;width:var(--sidebar);
  padding:14px;text-align:center;background:#222;
}
.social a{
  display:inline-grid;place-items:center;width:40px;height:40px;
  margin:0 5px;background:var(--coral);color:#222;text-decoration:none;
  font-weight:700;
}
.menu-button{display:none}
.content{
  width:calc(100% - var(--sidebar));
  margin-left:var(--sidebar);
  padding:30px;
  max-width:1100px;
}
.panel{
  padding:60px 30px;
  background:var(--paper);
  border-bottom:30px solid var(--yellow);
}
.hero{
  min-height:430px;
  display:grid;grid-template-columns:1.25fr 1fr;align-items:center;
  position:relative;overflow:hidden;
}
.eyebrow{color:var(--coral);font-size:22px;font-weight:700;margin:0 0 8px}
.hero h1{font-size:clamp(44px,6vw,72px);line-height:1.06;color:var(--ink);margin:0 0 14px;letter-spacing:-2px}
.roles{margin:0;color:var(--ink);font-size:clamp(17px,1.8vw,24px);font-weight:500;line-height:1.6;max-width:720px;min-height:2.2em}
.hero-figure{
  align-self:center;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:32px 18px
}
.hero-figure img{
  display:block;
  width:88%;
  max-width:430px;
  height:auto;
  max-height:320px;
  object-fit:contain;
  object-position:center;
  border:0
}
.action-row{display:grid;grid-template-columns:1fr 1fr;border-bottom:30px solid var(--yellow)}
.action{
  display:block;padding:16px 20px;text-align:center;text-decoration:none;
  font-size:19px;font-weight:700;transition:.2s
}
.action.dark{background:#222;color:var(--coral)}
.action.coral{background:var(--coral);color:#222}
.action:hover{filter:brightness(1.05)}
.section-title{position:relative;margin-bottom:34px;padding-bottom:10px}
.section-title h2{margin:0;color:var(--ink);font-size:35px;letter-spacing:2px}
.section-title:after{content:"";position:absolute;left:0;bottom:0;width:50px;height:3px;background:var(--coral)}
.about-grid{display:grid;grid-template-columns:minmax(220px, .8fr) 1.2fr;gap:30px;align-items:center}
.about-image{width:100%;aspect-ratio:4/5;object-fit:cover;background:#eee}
.about-grid-text-only{grid-template-columns:1fr;max-width:760px}
.button{
  display:inline-block;border:0;border-radius:0;padding:9px 17px;
  color:#222;background:var(--coral);text-decoration:none;font:inherit;font-weight:600;cursor:pointer
}
.button:hover{background:#222;color:var(--coral)}
.skills-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 28px}
.skill-head{display:flex;justify-content:space-between;color:#333;margin-bottom:6px}
.track{height:7px;border:1px solid var(--coral);background:#fff}
.fill{height:100%;background:var(--coral);width:0;transition:width 1s ease}
.timeline-grid{display:grid;grid-template-columns:1fr 1fr}
.timeline-item{padding:22px 20px;border-left:1px solid var(--coral)}
.timeline-date{font-size:13px;letter-spacing:.5px}
.timeline-item h3{margin:7px 0 3px;color:var(--ink);font-size:20px;letter-spacing:.5px}
.timeline-title-link{color:inherit;text-decoration:none}
.timeline-title-link:hover{color:var(--coral)}
.timeline-item h4{margin:0 0 7px;font-size:14px;font-weight:500;font-style:italic}
.timeline-meta{display:flex;justify-content:space-between;align-items:baseline;gap:20px;margin:0 0 7px;font-size:14px;font-weight:500;font-style:normal}
.timeline-meta span:last-child{text-align:right}
.timeline-item p{margin:0}
.filters{display:flex;flex-wrap:wrap;gap:0;margin:-10px 0 30px}
.filter{
  padding:10px 12px;border:1px solid var(--coral);background:#fff;
  color:#666;text-transform:uppercase;font-size:12px;cursor:pointer;margin-right:-1px
}
.filter.active,.filter:hover{background:var(--coral);color:#222}
.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.project{
  position:relative;min-height:245px;background:#f4f4f4;overflow:hidden;
  display:flex;flex-direction:column;justify-content:flex-end
}
.project img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.project:after{content:"";position:absolute;inset:0;background:linear-gradient(transparent 35%,rgba(255,111,97,.87));opacity:.18;transition:.25s}
.project:hover:after{opacity:1}
.project-body{position:relative;z-index:2;padding:22px;color:#222;transform:translateY(10px);opacity:0;transition:.25s}
.project:hover .project-body{transform:none;opacity:1}
.project-body h3{margin:0 0 6px}
.project-body p{margin:0 0 12px;font-size:13px}
.project-body a{font-weight:700;text-decoration:none}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:30px}
.contact-line{margin:0 0 12px}
.contact-line strong{color:var(--coral);display:inline-block;min-width:74px}
.contact-form{display:grid;gap:12px}
.contact-form input,.contact-form textarea{
  width:100%;border:1px solid #d8d8d8;border-radius:0;padding:11px 12px;font:inherit
}
.contact-form input:focus,.contact-form textarea:focus{outline:1px solid var(--coral);border-color:var(--coral)}
footer{
  display:flex;justify-content:space-between;gap:20px;padding:25px 30px;
  background:var(--yellow);color:#222;font-size:13px
}
footer p{margin:0}.credit{opacity:.72}
.back-top{
  position:fixed;right:28px;bottom:28px;width:40px;height:40px;
  display:grid;place-items:center;background:#222;color:var(--coral);text-decoration:none;z-index:30
}
@media(max-width:991px){
  :root{--sidebar:0px}
  .sidebar{position:relative;width:100%;height:auto;overflow:visible}
  .profile-art{display:none}
  .menu-button{
    display:block;position:absolute;right:15px;top:12px;z-index:4;
    background:var(--coral);border:0;padding:8px 12px;font-size:20px
  }
  .nav{padding:12px 60px 12px 15px;display:none}
  .nav.open{display:block}
  .nav a{padding:7px 10px}
  .nav a:hover,.nav a.active{padding-left:16px}
  .social{display:none}
  .content{width:100%;margin-left:0;max-width:none;padding:20px}
}
@media(max-width:720px){
  .featured-collab-grid{grid-template-columns:1fr}
  .content{padding:12px}
  .panel{padding:42px 20px;border-bottom-width:18px}
  .action-row{border-bottom-width:18px}
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-figure{max-width:420px;margin:8px auto 0;padding:22px 12px}
  .about-grid,.contact-grid,.skills-grid,.timeline-grid{grid-template-columns:1fr}
  .project-grid{grid-template-columns:1fr 1fr}
  footer{display:block}footer p+ p{margin-top:5px}
}
@media(max-width:480px){
  .project-grid{grid-template-columns:1fr}
  .action{font-size:16px}
}

.featured-panel{background:#fff}
.featured-collab-grid{display:grid;grid-template-columns:1fr 1fr}
.featured-collab-card{
  background:#fff;
  color:var(--muted);
  padding:26px 24px;
  min-height:230px;
  border-left:1px solid var(--coral)
}
.featured-collab-top{
  display:flex;
  justify-content:space-between;
  gap:18px;
  align-items:flex-start;
  margin-bottom:18px;
  font-size:13px
}
.featured-date{color:var(--muted);font-weight:500}
.featured-org{text-align:right;color:var(--muted);font-weight:500}
.featured-collab-card h3{
  margin:0 0 14px;
  color:var(--ink);
  font-size:22px;
  line-height:1.45
}
.featured-collab-card p{margin:0;color:var(--muted)}
.featured-role{
  color:var(--muted)!important;
  font-weight:500;
  margin-bottom:10px!important
}

/* v11 refinements: cleaner hero copy and profile photo moved to Contact */
.nav{padding-top:28px}
.roles{
  font-size:clamp(16px,1.45vw,20px);
  line-height:1.75;
  max-width:650px;
  word-break:keep-all;
  overflow-wrap:normal;
  text-wrap:pretty;
}
.contact-grid{
  grid-template-columns:minmax(170px,.72fr) minmax(170px,.72fr) minmax(280px,1.35fr);
  align-items:start;
  gap:28px;
}
.contact-photo-wrap{width:100%;max-width:230px}
.contact-photo{
  display:block;
  width:100%;
  aspect-ratio:4/5;
  object-fit:cover;
  object-position:45% 34%;
  border-radius:2px;
}
@media(max-width:900px){
  .contact-grid{grid-template-columns:minmax(180px,.75fr) 1.25fr}
  .contact-photo-wrap{grid-row:1 / span 2}
}
@media(max-width:720px){
  .contact-grid{grid-template-columns:1fr}
  .contact-photo-wrap{grid-row:auto;max-width:320px;margin:0 auto 8px}
  .roles{font-size:16px;line-height:1.7}
}

/* v12: experience organization first; role stays on the opposite side when present */
.timeline-meta span:first-child{text-align:left}
.timeline-meta span:last-child{text-align:right}
.timeline-meta span:only-child{text-align:left}

/* v13: intentional hero break + circular right-side logo accents without moving desktop text */
.roles{white-space:pre-line}
.timeline-item,.featured-collab-card{position:relative}
.item-logo-group{
  position:absolute;
  right:24px;
  bottom:24px;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:8px;
  pointer-events:none;
}
.item-logo-badge{
  position:relative;
  width:72px;
  height:72px;
  flex:0 0 72px;
  overflow:hidden;
  border-radius:50%;
  background:#fff;
  border:1px solid #e8e8e8;
  box-shadow:0 3px 12px rgba(0,0,0,.07);
  display:grid;
  place-items:center;
}
.item-logo-badge img{
  position:relative;
  z-index:2;
  display:block;
  width:100%;
  height:100%;
  object-fit:contain;
}
.logo-fallback{
  position:absolute;
  inset:0;
  z-index:1;
  display:grid;
  place-items:center;
  padding:8px;
  color:#666;
  font-size:11px;
  font-weight:800;
  text-align:center;
  line-height:1.1;
}
.logo-fit-contain img{padding:8px;object-fit:contain}
.logo-skax img{padding:14px 8px}
.logo-zoom-hira img{
  width:138%;height:138%;max-width:none;object-fit:cover;
}
.logo-crop-kdata img{
  position:absolute;
  z-index:2;
  left:0;top:0;
  height:100%;width:auto;max-width:none;
  object-fit:initial;
}
.logo-crop-uos img{
  position:absolute;
  z-index:2;
  width:320%;height:auto;max-width:none;
  left:-102%;top:-1%;
}
.logo-mark-text{
  position:relative;
  z-index:2;
  color:#222;
  font-weight:800;
  letter-spacing:-.8px;
}
.logo-mark-opic .logo-mark-text{font-size:20px;color:#222;padding-top:7px}
.logo-mark-opic:before{
  content:"";
  position:absolute;
  width:46px;height:24px;
  top:13px;left:12px;
  border:5px solid #326aa7;
  border-color:#326aa7 transparent transparent transparent;
  border-radius:50%;
  transform:rotate(-7deg);
}
.logo-mark-run{
  background:#222;
  border-color:#222;
}
.logo-mark-run .logo-mark-text{color:#fff;font-size:21px;letter-spacing:.5px}
#education-list .timeline-item:first-child .item-logo-group{top:34px;bottom:auto}
#collaboration .item-logo-group{right:24px;bottom:22px}
#certifications .item-logo-group{right:24px;top:50%;bottom:auto;transform:translateY(-50%)}

@media(max-width:720px){
  .item-logo-group,
  #education-list .timeline-item:first-child .item-logo-group,
  #collaboration .item-logo-group,
  #certifications .item-logo-group{
    position:static;
    transform:none;
    margin-top:16px;
    justify-content:flex-end;
  }
  .item-logo-badge{width:58px;height:58px;flex-basis:58px}
  .logo-mark-opic:before{width:38px;height:20px;top:10px;left:9px}
  .logo-mark-opic .logo-mark-text{font-size:17px}
  .logo-mark-run .logo-mark-text{font-size:18px}
}

/* v14: logo-only badges; preserve all content geometry */
.logo-fallback{display:none!important}
.logo-hira img{padding:9px;object-fit:contain}
.logo-coss img{padding:8px;object-fit:contain}
.logo-lg-ai img{padding:13px 8px;object-fit:contain}
.logo-kma img{padding:7px;object-fit:contain}

/* Show the complete UOS emblem from the official guideline sheet instead of clipping it. */
.logo-crop-uos img{
  position:absolute;
  z-index:2;
  width:240%;
  height:auto;
  max-width:none;
  left:-59%;
  top:6%;
}

/* Education logos remain an overlay on the right so text coordinates do not shift. */
#education-list .timeline-item .item-logo-group{
  right:20px;
  top:50%;
  bottom:auto;
  transform:translateY(-50%);
}
#education-list .timeline-item:first-child .item-logo-group{
  right:20px;
  top:50%;
  bottom:auto;
  transform:translateY(-50%);
}

@media(max-width:720px){
  #education-list .timeline-item .item-logo-group,
  #education-list .timeline-item:first-child .item-logo-group{
    position:static;
    transform:none;
    margin-top:16px;
    justify-content:flex-end;
  }
}

/* v15: curated portfolio categories + project detail pages */
#portfolio .filters{
  gap:8px;
  margin:-6px 0 28px;
}
#portfolio .filter{
  margin:0;
  padding:10px 14px;
  border:1px solid #dedede;
  background:#fff;
  color:#666;
  text-transform:none;
  font-size:13px;
  font-weight:600;
  letter-spacing:.1px;
  transition:.2s;
}
#portfolio .filter.active,
#portfolio .filter:hover{
  border-color:var(--coral);
  background:var(--coral);
  color:#222;
}
#portfolio .project-grid{
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
}
#portfolio .project{
  min-height:250px;
  background:#fff;
  border:1px solid #e6e6e6;
  border-left:4px solid var(--coral);
  overflow:hidden;
  display:block;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
#portfolio .project:after{display:none}
#portfolio .project:hover{
  transform:translateY(-4px);
  border-color:#d9d9d9;
  border-left-color:var(--coral);
  box-shadow:0 12px 30px rgba(0,0,0,.07);
}
.project-card-link{
  display:flex;
  flex-direction:column;
  min-height:250px;
  height:100%;
  padding:24px;
  color:inherit;
  text-decoration:none;
}
.project-topline{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:18px;
  margin-bottom:30px;
  font-size:12px;
}
.project-category{
  color:var(--coral);
  font-weight:700;
  letter-spacing:.35px;
}
.project-date{color:#777;white-space:nowrap}
#portfolio .project-body{
  position:static;
  z-index:auto;
  padding:0;
  color:inherit;
  transform:none;
  opacity:1;
  transition:none;
  display:flex;
  flex:1;
  flex-direction:column;
}
#portfolio .project-body h3{
  margin:0 0 10px;
  color:var(--ink);
  font-size:21px;
  line-height:1.45;
  word-break:keep-all;
}
.project-organization{
  margin:0 0 14px!important;
  color:#555;
  font-size:13px!important;
  font-weight:600;
}
.project-description{
  margin:0 0 24px!important;
  color:var(--muted);
  font-size:14px!important;
  line-height:1.7;
  word-break:keep-all;
}
.project-more{
  margin-top:auto;
  color:var(--ink);
  font-size:13px;
  font-weight:700;
}
.project-more span{color:var(--coral);padding-left:3px}

.project-detail-page{
  min-height:100vh;
  background:#efefef;
}
.detail-shell{padding:42px 20px 70px}
.detail-container{width:min(980px,100%);margin:0 auto}
.detail-back{
  display:inline-block;
  margin:0 0 18px;
  color:#555;
  text-decoration:none;
  font-size:14px;
  font-weight:600;
}
.detail-back:hover{color:var(--coral)}
.detail-card{
  background:#fff;
  border-top:6px solid var(--coral);
  box-shadow:0 16px 45px rgba(0,0,0,.06);
}
.detail-hero{padding:58px 64px 52px;border-bottom:1px solid var(--line)}
.detail-kicker{
  display:flex;
  justify-content:space-between;
  gap:20px;
  margin-bottom:24px;
  color:var(--coral);
  font-size:13px;
  font-weight:700;
  letter-spacing:.35px;
}
.detail-kicker span:last-child{color:#777;font-weight:500}
.detail-hero h1{
  max-width:820px;
  margin:0 0 16px;
  color:var(--ink);
  font-size:clamp(34px,5vw,54px);
  line-height:1.28;
  letter-spacing:-1.6px;
  word-break:keep-all;
}
.detail-organization{margin:0 0 4px;color:#444;font-size:17px;font-weight:600}
.detail-role{margin:0 0 20px;color:var(--coral);font-size:14px;font-weight:700}
.detail-lead{
  max-width:760px;
  margin:24px 0 0;
  color:#666;
  font-size:18px;
  line-height:1.8;
  word-break:keep-all;
}
.detail-actions{margin-top:28px}
.detail-content{padding:12px 64px 64px}
.detail-section{padding:40px 0;border-bottom:1px solid var(--line)}
.detail-section:last-child{border-bottom:0;padding-bottom:0}
.detail-section-label{
  margin:0 0 4px;
  color:var(--coral);
  font-size:12px;
  font-weight:800;
  letter-spacing:1.1px;
  text-transform:uppercase;
}
.detail-section h2{margin:0 0 18px;color:var(--ink);font-size:25px}
.detail-section > p:not(.detail-section-label){margin:0;max-width:780px;line-height:1.9;word-break:keep-all}
.detail-prose{display:grid;gap:18px;max-width:800px}
.detail-prose p{margin:0;color:#555;line-height:1.95;word-break:keep-all}
.detail-highlight-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
.detail-highlight-list li{
  position:relative;
  padding:14px 18px 14px 38px;
  background:#fafafa;
  border-left:2px solid var(--coral);
  color:#555;
}
.detail-highlight-list li:before{
  content:"";
  position:absolute;
  left:18px;
  top:25px;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--coral);
}
.detail-keywords{display:flex;flex-wrap:wrap;gap:9px}
.detail-keywords span{
  padding:7px 11px;
  border:1px solid #e4e4e4;
  background:#fff;
  color:#555;
  font-size:12px;
  font-weight:600;
}
.detail-empty{padding:64px}
.detail-empty h1{margin:5px 0 12px;color:var(--ink)}
.detail-empty .button{margin-top:16px}

@media(max-width:720px){
  #portfolio .project-grid{grid-template-columns:1fr}
  .detail-shell{padding:18px 12px 40px}
  .detail-hero{padding:38px 24px 34px}
  .detail-content{padding:4px 24px 36px}
  .detail-kicker{display:block}
  .detail-kicker span{display:block}
  .detail-kicker span+span{margin-top:5px}
  .detail-lead{font-size:16px}
  .detail-empty{padding:38px 24px}
}

/* v16: make timeline/collaboration entries that exist in Portfolio clickable */
.section-project-link{
  display:block;
  color:inherit;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.timeline-item.section-project-link:hover,
.timeline-item.section-project-link:focus-visible,
.featured-collab-card.section-project-link:hover,
.featured-collab-card.section-project-link:focus-visible{
  background:#fffafa;
  box-shadow:0 10px 24px rgba(0,0,0,.055);
  transform:translateY(-2px);
  outline:none;
}
.timeline-item.section-project-link:hover h3,
.timeline-item.section-project-link:focus-visible h3,
.featured-collab-card.section-project-link:hover h3,
.featured-collab-card.section-project-link:focus-visible h3{
  color:var(--coral);
}

/* v17: project detail image galleries */
.detail-media-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
}
.detail-media-item{
  margin:0;
  min-width:0;
  overflow:hidden;
  border:1px solid #e7e7e7;
  background:#fafafa;
}
.detail-media-item a{
  display:block;
  background:#f3f3f3;
  line-height:0;
}
.detail-media-item img{
  display:block;
  width:100%;
  height:auto;
  max-height:560px;
  object-fit:contain;
  background:#fff;
  transition:transform .2s ease;
}
.detail-media-item a:hover img{transform:scale(1.01)}
.detail-media-item figcaption{
  padding:12px 14px 14px;
  color:#666;
  font-size:12px;
  line-height:1.65;
  word-break:keep-all;
}
@media(max-width:720px){
  .detail-media-grid{grid-template-columns:1fr;gap:14px}
  .detail-media-item img{max-height:none}
}