/* ----------------------------------------------------------------
   Léo Jean — personal site
   Inter throughout, 900px max-width, restrained palette
   ---------------------------------------------------------------- */

:root {
  --text:        #1c1c1e;
  --text-soft:   #4a4a4f;
  --text-faint:  #8a8a90;
  --link:        #1c1c1e;
  --link-accent: #2c5282;   /* muted steel blue, for hover only */
  --rule:        #e6e6e6;
  --bg:          #ffffff;
  --max-width:   1100px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11"; /* nicer Inter alternates */
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 2rem 5rem;
}

/* ---------- header / nav ---------- */
header {
  margin-bottom: 3.5rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.005em;
  margin: 0;
}
.site-title a {
  color: var(--text);
  text-decoration: none;
  border: none;
}

nav { font-size: 0.95rem; }

nav a {
  color: var(--text-soft);
  text-decoration: none;
  margin-left: 1.75rem;
  font-weight: 400;
  transition: color 0.15s;
}
nav a:first-child { margin-left: 0; }
nav a:hover { color: var(--link-accent); }
nav a.active { color: var(--text); font-weight: 500; }

/* ---------- headings ---------- */
h1 {
  font-weight: 600;
  font-size: 1.75rem;
  letter-spacing: -0.015em;
  margin: 0 0 2rem;
}

h2 {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
  color: var(--text);
  margin: 2.75rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

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

/* ---------- text & links ---------- */
p { margin: 0 0 1.1rem; }

a {
  color: var(--link-accent);
  text-decoration: underline;
  text-decoration-color: rgba(44, 82, 130, 0.25);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s, text-decoration-color 0.15s;
}
a:hover {
  color: #1a365d;
  text-decoration-color: #1a365d;
}

strong, b { font-weight: 600; }

/* ---------- home: photo + bio side by side ---------- */
.intro {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-bottom: 2rem;
}

.photo {
  width: 300px;
  height: 375px;
  background: #f3f3f3;
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-size: 0.85rem;
}
.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.bio p:first-child { margin-top: -0.3rem; }

/* ---------- contact / affiliation blocks ---------- */
.meta-block {
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.meta-block .label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-faint);
  display: block;
  margin-bottom: 0.4rem;
}
.meta-block ul { list-style: none; padding: 0; margin: 0; }
.meta-block li {
  margin-bottom: 0.2rem;
  color: var(--text-soft);
}
.meta-block a { color: var(--text); }

.social {
  margin-top: 2rem;
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

/* ---------- research papers ---------- */
.paper { margin-bottom: 2rem; }

.paper > summary {
  cursor: pointer;
  padding: 0;
  margin: 0;
  outline: none;
}

.paper-title {
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--text);
  margin: 0 0 0.3rem;
  line-height: 1.4;
  display: inline;
}

.paper-meta {
  font-size: 0.88rem;
  color: var(--text-faint);
  margin: 0.2rem 0 0 1.1rem;
}
.paper-meta a { color: var(--text-soft); }

.paper-body {
  margin: 0.75rem 0 0 1.1rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--rule);
}

.paper-abstract {
  font-size: 0.95rem;
  color: var(--text-soft);
  margin-bottom: 0.5rem;
}

.paper-abstract.empty::before {
  content: "Abstract coming soon.";
  font-style: italic;
  color: var(--text-faint);
}

.paper-links {
  font-size: 0.88rem;
  margin-top: 0.5rem;
}
.paper-links a {
  margin-right: 1.25rem;
  color: var(--text-soft);
}

.paper-note {
  font-size: 0.88rem;
  color: var(--text-faint);
  margin: 0.5rem 0 0;
  font-style: italic;
}

/* ---------- teaching ---------- */
.course {
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}
.course-info {
  flex: 1;
  min-width: 0;
}
.course-title {
  font-weight: 500;
  font-size: 1rem;
  margin: 0;
  color: var(--text);
}
.course-inst {
  font-size: 0.88rem;
  color: var(--text-faint);
  margin: 0.1rem 0 0;
}
.course-when {
  font-size: 0.88rem;
  color: var(--text-faint);
  white-space: nowrap;
}

/* ---------- cv page ---------- */
.cv-note {
  font-size: 0.95rem;
  color: var(--text-soft);
  margin-bottom: 1.5rem;
}
.cv-embed {
  width: 100%;
  height: 88vh;
  border: 1px solid var(--rule);
}

/* ---------- footer ---------- */
footer {
  margin-top: 5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.82rem;
  color: var(--text-faint);
}

/* ---------- mobile ---------- */
@media (max-width: 640px) {
  .container { padding: 2.5rem 1.25rem 3rem; }
  body { font-size: 16px; }
  header { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  nav a { margin-left: 0; margin-right: 1.25rem; }
  .intro { grid-template-columns: 1fr; gap: 1.5rem; }
  .photo { width: 220px; height: 275px; }
  h1 { font-size: 1.5rem; }
  .course { flex-direction: column; gap: 0.1rem; }
}