/* ==========================================================================
   Sungyeon Kim — Academic homepage
   Styled after the Academic Pages / Minimal Mistakes visual system
   ========================================================================== */

:root{
  --global-font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --header-font-family: "Saira Extra Condensed", "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --text-color:#494e52;
  --muted-text-color:#6f777d;
  --border-color:#f2f3f3;
  --link-color:#52adc8;
  --link-hover:#2f7f95;
  --masthead-height:64px;
  --max-width:1280px;
  --content-width:880px;
  --logo-border-color:#d8dde3;
  --logo-bg-color:#ffffff;
  --logo-shadow:0 1px 2px rgba(0,0,0,.06);
  --venue-color:#1e3a5f;
  --venue-bg:#f5f9ff;
  --venue-border:#cbdff5;
  --pub-note-color:#a14912;
  --pub-note-bg:#fff4e8;
  --pub-note-border:#ffd7aa;
  --archive-color:#626b73;
  --archive-bg:#f3f4f6;
  --archive-border:#d9dee4;
  --pub-chip-color:#4f5b66;
  --pub-chip-bg:#f8fafc;
  --pub-chip-border:#d9e0e7;
  --pub-chip-hover-color:#2f7f95;
  --pub-chip-hover-bg:#eef8fb;
  --pub-chip-hover-border:#b9dde7;
  --author-link-color:#3f464d;
  --author-link-hover:#2f7f95;
  --pub-title-color:#1b66b1;
  --pub-title-hover:#124f8a;
  --transition-speed:.38s;
}

body.dark-mode{
  --text-color:#d8dee9;
  --muted-text-color:#a9b1bd;
  --border-color:#2f3640;
  --link-color:#78c7df;
  --link-hover:#a7e2f0;
  --logo-bg-color:#151a20;
  --logo-border-color:#2f3640;
  --venue-color:#b9d7f2;
  --venue-bg:#182430;
  --venue-border:#2b3f52;
  --pub-note-color:#e3a26c;
  --pub-note-bg:#2a2013;
  --pub-note-border:#4a361c;
  --archive-color:#a9b1bd;
  --archive-bg:#1a1e23;
  --archive-border:#2a2f36;
  --pub-title-color:#7fd6f5;
  --pub-title-hover:#a7e2f0;
  --pub-chip-color:#c3cbd4;
  --pub-chip-bg:#181c21;
  --pub-chip-border:#2a2f36;
  --pub-chip-hover-color:#a7e2f0;
  --pub-chip-hover-bg:#18262d;
  --pub-chip-hover-border:#2e4a54;
  --author-link-color:#d8dee9;
  --author-link-hover:#a7e2f0;
  background:#111418;
}

@media (prefers-reduced-motion: reduce){
  *{ transition: none !important; scroll-behavior: auto !important; }
}

*, *::before, *::after{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin:0;
  color:var(--text-color);
  font-family:var(--global-font-family);
  font-size:18px;
  line-height:1.5;
  background:#fff;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1,h2,h3,h4,h5{ font-family:var(--header-font-family); color:#34383b; }
body.dark-mode h1, body.dark-mode h2, body.dark-mode h3,
body.dark-mode h4, body.dark-mode h5{ color:#e8ecf1; }

a{ color:var(--link-color); text-decoration:none; }
a:hover{ color:var(--link-hover); text-decoration:underline; }
strong{ font-weight:700; color:#3b3f42; }
body.dark-mode strong{ color:#e8ecf1; }
p{ margin:0 0 1.25em; }

ul{ padding-left:20px; margin:0 0 1rem; }
li{ margin-bottom:6px; }

hr{ border:none; border-top:1px solid var(--border-color); margin:0; }

/* ---------- Masthead ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:20;
  background:#fff;
  border-bottom:1px solid var(--border-color);
  box-shadow:0 1px 3px rgba(0,0,0,.04);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
body.dark-mode .masthead{ background:#111418; }

.masthead__inner-wrap{
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 1.2rem;
  min-height:var(--masthead-height);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:2rem;
}

.site-title{
  color:#34383b;
  font-family:var(--header-font-family);
  font-size:1.5rem;
  font-weight:700;
  letter-spacing:.01em;
  white-space:nowrap;
}
body.dark-mode .site-title{ color:#e8ecf1; }
.site-title:hover{ color:var(--link-hover); text-decoration:none; }

.masthead__menu{
  display:flex;
  align-items:center;
  gap:1.6rem;
}

.visible-links{
  list-style:none;
  display:flex;
  align-items:center;
  gap:1.4rem;
  margin:0;
  padding:0;
  font-family:var(--header-font-family);
  font-weight:700;
  font-size:1.05rem;
  text-transform:uppercase;
  letter-spacing:.045em;
}
.visible-links li{ margin:0; }
.visible-links a{ color:var(--muted-text-color); }
.visible-links a:hover{ color:var(--link-hover); text-decoration:none; }

.theme-toggle{
  border:1px solid var(--border-color);
  background:none;
  color:var(--text-color);
  width:36px;
  height:36px;
  border-radius:50%;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:.95rem;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}
.theme-toggle:hover{ background:var(--pub-chip-hover-bg); }

/* ---------- Page layout ---------- */
.page{
  max-width:var(--max-width);
  margin:0 auto;
  padding:2.8rem 1.2rem 3rem;
  display:grid;
  grid-template-columns:260px minmax(0, var(--content-width));
  column-gap:4.5rem;
  align-items:start;
}

.sidebar{
  position:sticky;
  top:calc(var(--masthead-height) + 2rem);
  font-size:.92rem;
  color:var(--muted-text-color);
}

.author__avatar img{
  width:175px;
  height:175px;
  object-fit:cover;
  border-radius:50%;
  display:block;
  margin:0 0 1rem;
  border:1px solid #e6e6e6;
}
body.dark-mode .author__avatar img{ border-color:#2f3640; }

.author__content h3{
  margin:0 0 .15rem;
  font-family:var(--header-font-family);
  font-size:2.15rem;
  line-height:1.02;
  color:#3a3f42;
}
body.dark-mode .author__content h3{ color:#e8ecf1; }

.author__content .tagline{
  margin:0 0 1rem;
  font-size:.98rem;
  color:var(--muted-text-color);
  line-height:1.4;
}

.author__urls{
  list-style:none;
  padding:0;
  margin:0;
}
.author__urls li{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-bottom:.55rem;
}
.author__urls a{ color:var(--author-link-color); }
.author__urls a:hover{ color:var(--author-link-hover); text-decoration:none; }
.author__urls i{ width:16px; text-align:center; }
.author__urls li:nth-child(1) i{ color:#4285f4; }
.author__urls li:nth-child(2) i{ color:#0a66c2; }
.author__urls li:nth-child(3) i{ color:var(--author-link-color); }
.author__urls li:nth-child(4) i{ color:#ff9900; }

/* ---------- Section headings ---------- */
.page__content h2{
  margin:2.1rem 0 1rem;
  padding-bottom:.3rem;
  font-family:var(--header-font-family);
  font-size:2rem;
  letter-spacing:.01em;
  color:#34383b;
  border-bottom:1px solid var(--border-color);
}
body.dark-mode .page__content h2{ color:#e8ecf1; }

.page__content section:first-of-type h2{ margin-top:0; }

#about p{ font-size:.95rem; line-height:1.55; }

.page__content h3{
  margin:1.25rem 0 .25rem;
  font-family:var(--header-font-family);
  font-size:1.45rem;
  color:#34383b;
}
body.dark-mode .page__content h3{ color:#e8ecf1; }

section{ scroll-margin-top: calc(var(--masthead-height) + 16px); }

/* ---------- News ---------- */
.news-list{ list-style:none; padding:0; margin:0; font-size:.95rem; }
.news-list li{
  display:flex;
  gap:1rem;
  padding:.35rem 0;
  border-bottom:1px dashed var(--border-color);
}
.news-list li:last-child{ border-bottom:none; }
.news-date{
  flex:0 0 auto;
  width:88px;
  color:var(--muted-text-color);
  font-weight:700;
  font-size:.85rem;
  font-family:var(--header-font-family);
}

/* ---------- Experience / Education ---------- */
.experience-list, .education-list{
  list-style:none;
  padding:0;
  margin:0;
}
.experience-list > li, .education-list > li{
  display:grid;
  grid-template-columns:65px minmax(0,1fr);
  gap:1.1rem;
  align-items:start;
  margin:0 0 1.15rem;
  padding-bottom:1.05rem;
  border-bottom:1px solid var(--border-color);
}
.experience-list li:last-child, .education-list li:last-child{
  border-bottom:none; margin-bottom:0; padding-bottom:0;
}

.logo-placeholder{
  width:65px;
  height:65px;
  border:1px solid var(--logo-border-color);
  background:var(--logo-bg-color);
  border-radius:8px;
  box-shadow:var(--logo-shadow);
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:var(--header-font-family);
  font-weight:700;
  font-size:.78rem;
  letter-spacing:.01em;
  color:var(--muted-text-color);
  text-align:center;
  line-height:1.1;
  object-fit:contain;
  padding:10px;
}

.role-header{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  flex-wrap:wrap;
  gap:.2rem 1rem;
}
.role-header > div:first-child{ flex:1 1 320px; min-width:0; }
.role-meta{ flex:0 0 auto; text-align:right; }
.role-title{ font-weight:700; color:#34383b; font-size:1.05rem; }
body.dark-mode .role-title{ color:#e8ecf1; }
.role-org{ color:var(--muted-text-color); font-size:.92rem; }
.role-meta{
  display:block;
  color:var(--muted-text-color);
  font-size:.88rem;
  white-space:nowrap;
}
.role-meta .place{ color:var(--pub-title-color); font-weight:600; }
.entry-body ul{ margin:.5rem 0 0; }
.entry-body li{ font-size:.96rem; }

/* ---------- Publications ---------- */
.pub-group-title{
  font-family:var(--header-font-family);
  font-weight:700;
  font-size:1.05rem;
  color:var(--muted-text-color);
  text-transform:uppercase;
  letter-spacing:.04em;
  margin:1.6rem 0 1rem;
}
.pub-group-title:first-child{ margin-top:0; }

.publication-list{
  list-style:none;
  padding:0;
  margin:0;
}
.publication{
  display:grid;
  grid-template-columns:104px minmax(0,1fr);
  gap:1.1rem;
  align-items:start;
  margin:0 0 .5rem;
  padding-bottom:1rem;
  border-bottom:1px solid var(--border-color);
  line-height:1.38;
}
.publication:last-child{ border-bottom:none; }
.pub-thumb{
  width:104px;
  height:72px;
  object-fit:cover;
  border:1px solid var(--logo-border-color);
  border-radius:6px;
  background:var(--logo-bg-color);
  box-shadow:var(--logo-shadow);
}
.pub-thumb--empty{
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--muted-text-color);
  font-size:1.4rem;
}
.pub-body{ min-width:0; }

.pub-title{
  display:block;
  font-size:1.05rem;
  line-height:1.3;
  font-weight:700;
  color:var(--pub-title-color);
  margin-bottom:.25rem;
}
.pub-title a{ color:var(--pub-title-color); }
.pub-title a:hover{ color:var(--pub-title-hover); }

.pub-authors{
  font-size:.95rem;
  color:var(--text-color);
  margin-bottom:.4rem;
}
.pub-authors .me{ font-weight:700; }
.pub-authors a{ color:var(--author-link-color); }
.pub-authors a:hover{ color:var(--author-link-hover); }

.pub-badges{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.32rem .38rem;
  margin:0 0 .5rem;
}
.pub-venue{
  display:inline-flex;
  align-items:center;
  padding:.08rem .42rem .11rem;
  border:1px solid var(--venue-border);
  border-radius:5px;
  background:var(--venue-bg);
  color:var(--venue-color);
  font-size:.87rem;
  font-weight:800;
  letter-spacing:.025em;
  line-height:1.15;
  white-space:nowrap;
}
.pub-note{
  display:inline-flex;
  align-items:center;
  padding:.08rem .40rem .11rem;
  border:1px solid var(--pub-note-border);
  border-radius:5px;
  background:var(--pub-note-bg);
  color:var(--pub-note-color);
  font-size:.76rem;
  font-weight:800;
  letter-spacing:.01em;
}
.pub-archive{
  display:inline-flex;
  align-items:center;
  padding:.08rem .40rem .11rem;
  border:1px solid var(--archive-border);
  border-radius:5px;
  background:var(--archive-bg);
  color:var(--archive-color);
  font-size:.76rem;
  font-weight:800;
  letter-spacing:.01em;
}

.pub-links{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
}
.pub-links a{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.22rem .6rem .26rem;
  border:1px solid var(--pub-chip-border);
  border-radius:999px;
  background:var(--pub-chip-bg);
  color:var(--pub-chip-color);
  font-weight:700;
  font-size:.82rem;
  letter-spacing:.005em;
  white-space:nowrap;
  transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}
.pub-links a:hover{
  color:var(--pub-chip-hover-color);
  background:var(--pub-chip-hover-bg);
  border-color:var(--pub-chip-hover-border);
  text-decoration:none;
}

/* ---------- Awards ---------- */
.award-list{ list-style:none; padding:0; margin:0; }
.award-list li{
  position:relative;
  padding:.32rem 0 .32rem 1.1rem;
  border-bottom:1px dashed var(--border-color);
  font-size:.95rem;
  line-height:1.4;
}
.award-list li::before{
  content:"";
  position:absolute;
  left:.1rem;
  top:.68rem;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--pub-title-color);
}
.award-list li:last-child{ border-bottom:none; }
.award-name{ font-weight:700; color:#34383b; }
body.dark-mode .award-name{ color:#e8ecf1; }
.award-year{ color:var(--muted-text-color); }
.award-org{ color:var(--muted-text-color); }
.award-win{ color:var(--text-color); }

/* ---------- Service / Patents ---------- */
.service-list{ list-style:none; padding:0; margin:0; }
.service-list li{
  padding:.4rem 0;
  border-bottom:1px dashed var(--border-color);
}
.service-list li:last-child{ border-bottom:none; }
.service-label{
  font-weight:700;
  color:#34383b;
  font-size:1.02rem;
  margin-bottom:.05rem;
}
body.dark-mode .service-label{ color:#e8ecf1; }

/* ---------- Footer ---------- */
.page__footer{
  max-width:var(--max-width);
  margin:2.5rem auto 0;
  padding:1rem 1.2rem 3rem;
  border-top:1px solid var(--border-color);
  color:#8b9297;
  font-size:.85rem;
  text-align:center;
}
.page__footer a{ color:#8b9297; }

/* ---------- Responsive ---------- */
@media (max-width:900px){
  body{ font-size:17px; }

  .masthead__inner-wrap{
    align-items:flex-start;
    flex-direction:column;
    gap:.4rem;
    padding-top:.8rem;
    padding-bottom:.8rem;
  }
  .masthead__menu{ width:100%; justify-content:space-between; }
  .visible-links{ flex-wrap:wrap; gap:.75rem 1rem; font-size:.9rem; }

  .page{
    grid-template-columns:1fr;
    row-gap:1.5rem;
    padding-top:1.5rem;
  }
  .sidebar{
    position:static;
    display:grid;
    grid-template-columns:100px 1fr;
    column-gap:1rem;
    align-items:start;
    border-bottom:1px solid var(--border-color);
    padding-bottom:1.2rem;
  }
  .author__avatar img{ width:100px; height:100px; margin:0; }
  .author__urls{ grid-column:1 / -1; margin-top:.8rem; }

  .experience-list > li, .education-list > li{ grid-template-columns:48px minmax(0,1fr); }
  .logo-placeholder{ width:48px; height:48px; font-size:.62rem; }
  .role-header{ flex-direction:column; align-items:flex-start; }

  .publication{ grid-template-columns:76px minmax(0,1fr); gap:.85rem; }
  .pub-thumb{ width:76px; height:54px; }

  .award-list li, .service-list li{ grid-template-columns:1fr; gap:.15rem; }
}