/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --text-primary: #1d1d1f;
  --text-secondary: #48484a;
  --text-tertiary: #636366;
  --link: #0071e3;
  --link-hover: #0077ED;
  --border: #d2d2d7;
  --bg: #ffffff;
  --transition: 0.2s ease;
}

/* ── Page Content Width ────────────────────────────────────── */
#quarto-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Global ───────────────────────────────────────────────── */
body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.022em;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  padding-bottom: 0;
  border-bottom: none;
}

/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
  background: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: none;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.navbar .navbar-brand {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary) !important;
  letter-spacing: -0.01em;
}

.navbar .nav-link {
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--text-secondary) !important;
  text-transform: none;
  letter-spacing: 0;
  padding-left: 0.9rem !important;
  padding-right: 0.9rem !important;
  transition: color var(--transition);
}

.navbar .nav-link:hover {
  color: var(--text-primary) !important;
  opacity: 1;
}

.navbar .nav-link.active {
  font-weight: 500;
  color: var(--text-primary) !important;
}

/* ── Two-Column Layout ────────────────────────────────────── */
.columns {
  gap: 5rem;
}

.columns .column:first-child {
  padding-right: 1rem;
}

.columns .column:last-child {
  padding-left: 1rem;
}

/* ── Profile ──────────────────────────────────────────────── */
.profile-card {
  text-align: center;
  margin-bottom: 2rem;
  padding: 0;
}

.profile-img {
  width: 100%;
  max-width: 210px;
  border-radius: 50%;
  margin: 0 auto 1.25rem auto;
  display: block;
}

.profile-name {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.5rem;
  margin-bottom: 0.35rem;
  letter-spacing: -0.022em;
}

.profile-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  margin-top: 0;
  text-align: left;
}

.profile-desc a {
  color: var(--link);
  text-decoration: none;
  transition: text-decoration-color var(--transition);
}

.profile-desc a:hover {
  text-decoration: underline;
}

/* ── Profile Links ────────────────────────────────────────── */
.profile-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.profile-links p {
  display: contents;
}

.profile-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--transition);
}

.profile-links a:hover {
  color: var(--link);
}

.profile-links a iconify-icon {
  font-size: 1.1em;
}

/* ── News Section ─────────────────────────────────────────── */
#news {
  margin-top: 2rem;
  padding-top: 0;
  border-top: none;
}

#news h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  margin-top: 0;
  margin-bottom: 0.75rem;
  border-bottom: none;
  padding-bottom: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

#news ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

#news li {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.news-date {
  color: var(--text-tertiary);
}

/* ── Research Section ─────────────────────────────────────── */
.right-panel > h2:first-of-type {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.022em;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.right-panel > p:first-of-type {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* ── Paper Items ──────────────────────────────────────────── */
.paper-card {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.paper-card:last-child {
  border-bottom: none;
}

.paper-card p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.paper-card a {
  color: var(--link);
  text-decoration: none;
  transition: color var(--transition);
}

.paper-card a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

/* ── Details Elements ─────────────────────────────────────── */
.paper-card details {
  margin-top: 0.5rem;
  margin-bottom: 0.25rem;
}

.paper-card details summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--link);
  padding: 0.25rem 0;
  transition: color var(--transition);
  user-select: none;
  list-style: none;
}

.paper-card details summary::-webkit-details-marker {
  display: none;
}

.paper-card details summary::before {
  content: "\25B6";
  display: inline-block;
  font-size: 0.55em;
  margin-right: 0.4rem;
  transition: transform var(--transition);
  transform-origin: center;
}

.paper-card details[open] summary::before {
  transform: rotate(90deg);
}

.paper-card details summary:hover {
  color: var(--link-hover);
}

.paper-card details[open] summary {
  margin-bottom: 0.25rem;
}

.paper-card details > p,
.paper-card details > ul {
  padding: 0.4rem 0 0.4rem 1.2rem;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-primary);
  text-align: justify;
}

.paper-card details > ul {
  padding-left: 2.2rem;
}

.paper-card details > ul li {
  margin-bottom: 0.2rem;
}

.paper-card details > ul li p {
  margin-bottom: 0;
  font-size: 0.88rem;
}

/* ── Footer ───────────────────────────────────────────────── */
.nav-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.nav-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-footer a:hover {
  color: var(--text-primary);
}

.nav-footer-center {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  #quarto-content {
    padding: 0 1rem;
  }

  .columns {
    display: block !important;
    gap: 0 !important;
  }

  .columns .column {
    width: 100% !important;
    padding: 0 !important;
  }

  .profile-card {
    margin-bottom: 1.5rem;
  }

  .profile-img {
    max-width: 170px;
  }

  .profile-name {
    font-size: 1.5rem;
  }

  .profile-desc {
    font-size: 0.9rem;
  }

  .profile-links a {
    font-size: 0.82rem;
  }

  h3 {
    font-size: 1.1rem;
  }
}