/* ===============================================================
   Youngsam Chun — academic homepage
   Minimal, print-friendly, no build step required.
   =============================================================== */

:root {
  --ink:        #1a1a1a;
  --ink-soft:   #4a4a4a;
  --ink-faint:  #767676;
  --rule:       #e3e3e3;
  --accent:     #1f497d;
  --accent-dim: #eef2f7;
  --bg:         #ffffff;
  --sidebar-w:  260px;
  --maxw:       760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
               Helvetica, Arial, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.62;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- top navigation ------------------------------------ */
.topbar {
  border-bottom: 1px solid var(--rule);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  max-width: calc(var(--sidebar-w) + var(--maxw) + 120px);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: baseline;
  gap: 26px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .2px;
  color: var(--ink);
  margin-right: auto;
}
.topbar a.nav {
  font-size: 14.5px;
  color: var(--ink-soft);
}
.topbar a.nav:hover { color: var(--accent); text-decoration: none; }
.topbar a.nav.active { color: var(--accent); font-weight: 600; }

/* ---------- layout -------------------------------------------- */
.wrap {
  max-width: calc(var(--sidebar-w) + var(--maxw) + 120px);
  margin: 0 auto;
  padding: 42px 28px 80px;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 60px;
  align-items: start;
}

/* ---------- sidebar ------------------------------------------- */
.sidebar { position: sticky; top: 84px; }

.avatar {
  width: 168px; height: 168px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin-bottom: 18px;
  background: var(--accent-dim);
  border: 1px solid var(--rule);
}
.avatar-fallback {
  width: 168px; height: 168px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 46px; font-weight: 700; letter-spacing: 1px;
  margin-bottom: 18px;
  border: 1px solid var(--rule);
}

.sidebar h1 {
  font-size: 20px;
  line-height: 1.3;
  margin: 0 0 6px;
  letter-spacing: -.2px;
}
.sidebar .role {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 4px;
}
.sidebar .org { font-size: 14px; color: var(--ink-faint); margin: 0 0 20px; }

.side-h {
  font-size: 11.5px;
  letter-spacing: 1.1px;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 22px 0 8px;
  font-weight: 700;
}
.side-list { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.side-list li { margin-bottom: 5px; color: var(--ink-soft); }

/* ---------- content ------------------------------------------- */
.content { min-width: 0; max-width: var(--maxw); }

.content h2 {
  font-size: 25px;
  margin: 0 0 18px;
  letter-spacing: -.3px;
}
.content h3 {
  font-size: 15.5px;
  margin: 30px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
  letter-spacing: .1px;
}
.content p { margin: 0 0 15px; }
.lead { font-size: 17px; }

.muted { color: var(--ink-faint); font-size: 14px; }
.small { font-size: 14px; }

/* entry blocks (projects, publications) */
.entry {
  padding: 15px 0;
  border-bottom: 1px solid var(--rule);
}
.entry:last-child { border-bottom: none; }
.entry-title { font-weight: 650; margin: 0 0 3px; }
.entry-meta {
  font-size: 13.5px;
  color: var(--ink-faint);
  margin: 0 0 7px;
}
.entry p { margin: 0 0 7px; font-size: 15px; }
.entry .links { font-size: 13.5px; }
.entry .links a { margin-right: 4px; }

/* nested sub-items within an entry (e.g. two outputs of one project) */
.sub-title {
  margin: 14px 0 4px !important;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  font-weight: 650;
  font-size: 14.5px;
}
.sub-body {
  margin: 0 0 5px !important;
  padding-left: 12px;
  border-left: 2px solid var(--rule);
  font-size: 14.5px;
}
.sub-links {
  padding-left: 12px;
  border-left: 2px solid var(--rule);
  margin: 0 0 4px !important;
}

.tag {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .4px;
  text-transform: uppercase;
  background: var(--accent-dim);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: 2px;
  font-weight: 600;
}
.tag.grey { background: #f1f1f1; color: var(--ink-faint); }

ul.plain { margin: 0 0 15px; padding-left: 20px; }
ul.plain li { margin-bottom: 6px; }

.cta {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 8px 18px;
  border-radius: 4px;
  font-size: 14.5px;
  font-weight: 600;
  margin-top: 6px;
}
.cta:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* ---------- footer -------------------------------------------- */
footer {
  border-top: 1px solid var(--rule);
  margin-top: 46px;
  padding-top: 18px;
  font-size: 13px;
  color: var(--ink-faint);
}

/* ---------- responsive ---------------------------------------- */
@media (max-width: 820px) {
  .wrap {
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 30px 22px 60px;
  }
  .sidebar { position: static; }
  .avatar, .avatar-fallback { width: 120px; height: 120px; font-size: 34px; }
  .content h2 { font-size: 22px; }
  .topbar-inner { padding: 12px 22px; gap: 18px; }
  .brand { width: 100%; margin-bottom: 4px; }
}

/* Nature-style figure — fills the text column */
figure.fig { margin: 18px 0 22px; padding: 0; max-width: 100%; }
figure.fig img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--rule); border-radius: 2px; background: #fff;
}
figure.fig figcaption {
  font-size: 12px; line-height: 1.5; color: var(--ink-faint); margin-top: 6px;
}
figure.fig figcaption b { color: var(--ink-soft); font-weight: 700; }

@media (max-width: 820px) {
  figure.fig { max-width: 100%; }
}