/* ---------- Colours & fonts ---------- */
:root {
  --bg: #fbfaf8;
  --panel: #f3f1ec;
  --text: #22201c;
  --muted: #6b665d;
  --rule: #e2ded5;
  --accent: #9e1b32;        /* deep UPF-style red */
  --accent-soft: #f5e6e8;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17161a;
    --panel: #1f1e23;
    --text: #e9e6e0;
    --muted: #a39e94;
    --rule: #34323a;
    --accent: #e07a8a;
    --accent-soft: #3a2328;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Two-column layout ---------- */
.page-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  max-width: 1180px;
  margin: 0 auto;
  min-height: 100vh;
}

.profile {
  background: var(--panel);
  border-right: 1px solid var(--rule);
}

.profile-inner {
  position: sticky;
  top: 0;
  padding: 48px 32px;
  max-height: 100vh;
  overflow-y: auto;
}

.portrait {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  margin: 0 auto 24px;
  border: 4px solid var(--bg);
  box-shadow: 0 2px 14px rgba(0, 0, 0, 0.08);
}

.profile h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.9rem;
  line-height: 1.2;
  margin: 0 0 6px;
  text-align: center;
}

.role {
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 24px;
}

/* Page navigation buttons (Research / Teaching) */
.site-nav {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 28px;
}

.site-nav a {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
  transition: background 0.15s, color 0.15s;
}

.site-nav a:hover { background: var(--accent-soft); text-decoration: none; }
.site-nav a[aria-current="page"] { background: var(--accent); color: var(--bg); }

.profile-section { margin-bottom: 22px; font-size: 0.93rem; }

.profile-section-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 4px;
}

.profile-section p { margin: 0; }

address { font-style: normal; }

.social-links { display: flex; flex-direction: column; gap: 4px; }
.social-links a { display: inline-flex; align-items: center; gap: 8px; }
.social-icon { width: 18px; height: 18px; fill: currentColor; flex-shrink: 0; }

.cv-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

/* ---------- Main content ---------- */
.content { padding: 56px 56px 80px; }

.section { margin-bottom: 56px; scroll-margin-top: 24px; }

.section h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.6rem;
  margin: 0 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.welcome-section p {
  max-width: 68ch;
  margin: 0 0 12px;
  text-align: justify;
  hyphens: auto;
}


/* In-page section jump links */
.jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 0.9rem;
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
}
.jump-links a { color: var(--muted); }
.jump-links a:hover { color: var(--accent); }

/* ---------- Paper entries ---------- */
.paper {
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}
.paper:last-child { border-bottom: none; }

.paper-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.paper h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.35;
  margin: 0;
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.paper-actions a,
.paper-actions button {
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 11px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}

.paper-actions a:hover,
.paper-actions button:hover,
.paper-actions button[aria-expanded="true"] {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.paper p { margin: 4px 0 0; }

.authors { color: var(--muted); font-size: 0.95rem; }

.status { font-size: 0.95rem; }
.status em { font-style: italic; }

.extra { font-size: 0.88rem; color: var(--muted); }

.abstract {
  margin-top: 10px;
  padding: 12px 16px;
  background: var(--panel);
  border-radius: 6px;
  font-size: 0.93rem;
  line-height: 1.6;
}
.abstract p { margin: 0; }

/* ---------- Teaching page ---------- */
.course {
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}
.course:last-child { border-bottom: none; }
.course h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.12rem;
  margin: 0;
}
.course .meta { color: var(--muted); font-size: 0.93rem; margin: 2px 0 6px; }
.course p { margin: 6px 0 0; max-width: 72ch; }

footer {
  margin-top: 40px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---------- Mobile ---------- */
@media (max-width: 860px) {
  .page-shell { grid-template-columns: 1fr; }
  .profile { border-right: none; border-bottom: 1px solid var(--rule); }
  .profile-inner { position: static; max-height: none; padding: 32px 16px 20px; }
  .portrait { max-width: 150px; margin-bottom: 16px; }
  .profile h1 { font-size: 1.6rem; }
  .role { margin-bottom: 16px; }
  .site-nav { margin-bottom: 18px; }
  .profile-details { text-align: center; }
  .profile-section { margin-bottom: 12px; }
  .profile-section.address { display: none; }
  .social-links { flex-direction: row; justify-content: center; gap: 18px; }
  .content { padding: 32px 16px 56px; }
  .paper-head { flex-direction: column; gap: 8px; }
  .paper-actions { justify-content: flex-start; }
}