/* ==========================================================================
   Seokju Cho — academic homepage
   Warm-paper minimal style: cream background, serif display, sage accent.
   Two-column layout: sticky sidebar (photo, name, links) + wide content.
   ========================================================================== */

:root {
  --bg: #fbfaf7;
  --ink: #211f1a;
  --muted: #6d6a5f;
  --faint: #767369;
  --line: #e5e2d8;
  --accent: #3b654a;
  --accent-dark: #294a35;
  /* pi.website pairing: Source Sans 3 (same font) + STIX Two Text
     (free stand-in for their licensed serif, Signifier by Klim) */
  --serif: "STIX Two Text", "Iowan Old Style", Georgia, serif;
  --sans: "Source Sans 3", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.25px;
  line-height: 1.67;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

::selection { background: #dce8df; }

section { scroll-margin-top: 2rem; }

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 140ms ease, text-decoration-color 140ms ease;
}
a:hover { color: var(--accent-dark); text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
a.quiet { color: inherit; }
a.quiet:hover { color: var(--accent-dark); }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.25;
  margin: 0;
}

h2 {
  font-size: 1.55rem;
  letter-spacing: -0.012em;
  margin: 3.5rem 0 1.1rem;
}

main > section:first-child h2:first-child { margin-top: 0; }

/* ------------------------------------------------------------- layout --- */

.layout {
  max-width: 71rem;
  margin: 0 auto;
  padding: 3.75rem 2rem 3.25rem;
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: 4.25rem;
  align-items: start;
}

main { min-width: 0; }

/* ------------------------------------------------------------ sidebar --- */

.sidebar {
  position: sticky;
  top: 2.5rem;
}

.portrait {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #edeae0;
  box-shadow: 0 12px 32px rgb(33 31 26 / 6%);
}

.sidebar h1 {
  font-size: 2rem;
  letter-spacing: -0.022em;
  margin-top: 1.2rem;
}

.tagline {
  margin: 0.45rem 0 1.1rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.5;
}

.contact-links {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
  font-weight: 500;
}

.contact-links li { padding: 0.16rem 0; }

.side-nav {
  margin-top: 1.3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.side-nav a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}
.side-nav a:hover { color: var(--ink); text-decoration: none; }

/* on short viewports a sticky sidebar could get clipped — let it scroll */
@media (max-height: 700px) {
  .sidebar { position: static; }
}

/* ---------------------------------------------------------------- bio --- */

.bio {
  max-width: 47rem;
}
.bio p { margin: 0 0 1.05rem; }
.bio p:first-child { margin-top: 0.35rem; }
.bio em { font-style: italic; }

/* --------------------------------------------------------------- news --- */

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-list li {
  display: grid;
  grid-template-columns: 5.4rem 1fr;
  gap: 1rem;
  padding: 0.38rem 0;
}

.news-list .date {
  color: var(--faint);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  padding-top: 0.15em;
}

/* ------------------------------------------------------- publications --- */

.section-note {
  margin: -0.5rem 0 0.5rem;
  color: var(--faint);
  font-size: 0.85rem;
}

.selected-key {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  margin-left: 1rem;
  white-space: nowrap;
}

.selected-dot {
  display: inline-block;
  width: 0.4rem;
  height: 0.4rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
}

h3.year {
  font-size: 1.1rem;
  font-style: italic;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.35rem;
  margin: 2.4rem 0 0.4rem;
}

.pub {
  margin: 0 -0.55rem;
  padding: 0.9rem 0.55rem;
  border-radius: 6px;
  transition: background-color 140ms ease;
}

.pub:hover { background: rgb(59 101 74 / 3.5%); }
.pub p { margin: 0; }

.pub-title {
  font-family: var(--serif);
  font-size: 1.13rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.006em;
}
.pub-title > .selected-dot {
  margin-right: 0.52rem;
  transform: translateY(-0.1rem);
}
.pub-title a { color: var(--ink); }
.pub-title a:hover { color: var(--accent-dark); }

.pub .pub-authors {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.15rem;
}
.pub-authors .me { color: var(--ink); font-weight: 600; }

.pub .pub-venue {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.15rem;
}
.pub-venue .venue { font-weight: 600; color: var(--ink); }
.pub-venue .award { color: var(--accent); font-weight: 600; }
.pub-venue .detail { color: var(--faint); }

.pub .pub-note {
  font-size: 0.85rem;
  color: var(--faint);
  font-style: italic;
  margin-top: 0.2rem;
}

.pub .pub-links {
  font-size: 0.85rem;
  font-weight: 500;
  margin-top: 0.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0 1rem;
}

/* ------------------------------------------- experience / education ----- */

.entry { padding: 0.75rem 0; }
.entry p { margin: 0; }

.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 1rem;
}

.entry-title {
  font-weight: 600;
  font-size: 0.98rem;
}

.entry-sub {
  display: block;
  font-weight: 400;
  color: var(--muted);
  font-size: 0.9rem;
}

.entry-when {
  color: var(--faint);
  font-size: 0.88rem;
  white-space: nowrap;
}

.entry .entry-detail {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

/* ------------------------------------------------------------- footer --- */

footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}

footer p {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.4rem 2rem 2.2rem;
  color: var(--faint);
  font-size: 0.85rem;
}

/* ------------------------------------------------------------- mobile --- */

@media (max-width: 900px) {
  .layout {
    display: block;
    padding: 1.8rem 1.1rem 2.5rem;
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns:
      minmax(0, 1fr)
      minmax(0, 10.75rem)
      1.35rem
      104px
      minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    align-items: start;
  }

  .portrait {
    grid-column: 4;
    grid-row: 1 / 3;
    justify-self: end;
    width: 104px;
    border-radius: 12px;
  }

  .sidebar h1 {
    grid-column: 2;
    grid-row: 1;
    align-self: end;
    font-size: 2.05rem;
    margin-top: 0;
  }

  .tagline {
    grid-column: 2;
    grid-row: 2;
    align-self: start;
    margin: 0.5rem 0 0;
    font-size: 0.95rem;
  }
  /* links flow inline with dot separators, like a compact header */
  .contact-links {
    grid-column: 1 / -1;
    grid-row: 3;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem 0.75rem;
    margin-top: 0.8rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--line);
  }
  .contact-links li { padding: 0; }

  .side-nav {
    display: none;
  }

  .bio { padding-top: 1.45rem; }

  body { font-size: 16px; }

  h2 { font-size: 1.4rem; margin-top: 2.6rem; }

  .news-list li {
    grid-template-columns: 4.6rem 1fr;
    gap: 0.7rem;
  }

  .entry-head { flex-direction: column; }

  footer p { padding-left: 1.1rem; padding-right: 1.1rem; }
}

@media (max-width: 360px) {
  .sidebar {
    grid-template-columns:
      minmax(0, 1fr)
      minmax(0, 10.4rem)
      1rem
      88px
      minmax(0, 1fr);
  }

  .portrait { width: 88px; }
  .sidebar h1 { font-size: 1.8rem; }
  .tagline { font-size: 0.86rem; }
  .contact-links {
    display: grid;
    grid-template-columns: repeat(3, max-content);
    justify-content: center;
    column-gap: 0.7rem;
  }
  .bio { padding-top: 1.2rem; }

  .selected-key {
    display: flex;
    width: max-content;
    margin: 0.2rem 0 0;
  }

  .news-list li {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0.45rem 0;
  }
}