/* ===== Sungho Lee — academic homepage styles ===== */
:root {
  --bg:       #ffffff;
  --bg-soft:  #f6f8fb;
  --text:     #1f2733;
  --muted:    #5b6675;
  --border:   #e4e8ee;
  --accent:   #2457d6;   /* scholarly blue */
  --accent-dk:#1b3fa0;
  --radius:   14px;
  --maxw:     1120px;
  --serif:    Georgia, "Times New Roman", serif;
  --sans:     "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dk); text-decoration: underline; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.25; font-weight: 700; }

/* ---------- Layout: sticky sidebar + content ---------- */
.layout {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 290px 1fr; gap: 56px;
  padding: 56px 28px 80px;
}
.sidebar { position: sticky; top: 40px; align-self: start; text-align: center; }
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; gap: 36px; padding: 36px 22px 60px; }
  .sidebar { position: static; }
}

/* ---------- Profile card ---------- */
.avatar {
  width: 180px; height: 180px; border-radius: 50%; margin: 0 auto 20px;
  object-fit: cover; border: 4px solid var(--bg); box-shadow: 0 6px 24px rgba(16,24,40,.12);
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent), #4f7ce8); color: #fff;
  font-family: var(--serif); font-size: 3.4rem; font-weight: 700; letter-spacing: .02em;
}
.profile-name { font-size: 1.6rem; margin-bottom: 4px; }
.profile-title { color: var(--text); font-weight: 600; font-size: .98rem; }
.profile-affil { color: var(--muted); font-size: .9rem; margin-bottom: 10px; }
.profile-affil a { color: var(--muted); }
.profile-tagline { color: var(--accent); font-size: .8rem; font-weight: 700; letter-spacing: .03em; margin-bottom: 18px; }

.links { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 24px; }
.links a {
  font-size: .82rem; color: var(--text); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; background: var(--bg-soft); text-decoration: none;
}
.links a:hover { border-color: var(--accent); color: var(--accent); }

.sidenav { border-top: 1px solid var(--border); padding-top: 18px; }
.sidenav a {
  display: block; color: var(--muted); font-size: .92rem; padding: 6px 0;
  text-decoration: none; letter-spacing: .02em;
}
.sidenav a:hover { color: var(--accent); }
@media (max-width: 880px) { .sidenav { display: none; } }

/* ---------- Content ---------- */
.content { min-width: 0; }
.section { margin-bottom: 48px; }
.section h2 {
  font-size: 1.5rem; color: var(--text); margin-bottom: 18px;
  padding-bottom: 8px; border-bottom: 2px solid var(--border);
}
.section h2 .tag { font-family: var(--sans); font-size: .7rem; color: var(--accent);
  font-weight: 700; letter-spacing: .12em; text-transform: uppercase; vertical-align: middle; margin-left: 10px; }
.section p { margin-bottom: 14px; }
.section p:last-child { margin-bottom: 0; }

.lead { color: var(--muted); }

ul.clean { list-style: none; }
ul.clean li { position: relative; padding-left: 20px; margin-bottom: 8px; }
ul.clean li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
ul.clean li b { color: var(--text); }

/* cards (research directions) */
.cards { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 6px; }
.card { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; }
.card h3 { font-size: 1.12rem; margin-bottom: 10px; }
.card p { color: var(--muted); line-height: 1.85; }

/* timeline (education / appointments) */
.entry { margin-bottom: 16px; }
.entry .row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.entry .role { font-weight: 700; }
.entry .date { color: var(--muted); font-size: .88rem; white-space: nowrap; }
.entry .org { color: var(--muted); font-size: .94rem; }
.entry .org a { color: var(--muted); }
.entry .meta { color: var(--muted); font-size: .9rem; font-style: italic; }

/* publication / talk lists */
ol.pubs, ol.talks { list-style: none; counter-reset: item; }
ol.pubs > li, ol.talks > li {
  position: relative; padding-left: 38px; margin-bottom: 16px; font-size: .95rem;
}
ol.pubs > li::before, ol.talks > li::before {
  counter-increment: item; content: "[" counter(item) "]";
  position: absolute; left: 0; top: 0; color: var(--accent); font-size: .82rem; font-weight: 700;
}
.pubs .me, .talks .me { font-weight: 700; color: var(--text); }
.pubs .jt { font-style: italic; }
.pubs .topic { display: block; color: var(--muted); font-size: .84rem; margin-top: 2px; }

.note { color: var(--muted); font-size: .9rem; }

/* news */
ul.news { list-style: none; }
ul.news li { padding: 12px 0; border-bottom: 1px solid var(--border); }
ul.news li:last-child { border-bottom: none; }
ul.news .date { display: inline-block; color: var(--accent); font-weight: 700; font-size: .82rem; margin-right: 10px; }

/* media (videos / figures) — one per row so they're large */
.media-grid { display: grid; grid-template-columns: 1fr; gap: 22px; margin-top: 24px; }
figure.media { margin: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg); }
figure.media video, figure.media img { width: 100%; display: block; }
figure.media figcaption { padding: 12px 16px; color: var(--muted); font-size: .88rem; background: var(--bg); }

/* CV page specifics */
.cv-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.btn {
  display: inline-block; font-size: .88rem; font-weight: 600; padding: 9px 16px;
  border-radius: 10px; text-decoration: none; border: 1px solid var(--border);
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dk); color: #fff; text-decoration: none; }
.btn-ghost { background: var(--bg-soft); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

footer {
  border-top: 1px solid var(--border); padding: 28px;
  text-align: center; color: var(--muted); font-size: .85rem;
}