/* =============================================
   Academic Website – style.css
   Color palette:
     Navy:  #012169 (Duke blue)
     Gold:  #B5820A (link color)
   ============================================= */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --navy:       #012169;
  --navy-light: #e8ecf5;
  --gold:       #B5820A;
  --gold-hover: #8a6008;
  --text:       #1a1a1a;
  --text-muted: #5a5a5a;
  --border:     #e0e0e0;
  --bg:         #ffffff;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ─────────────────────────────────── */

.site-header {
  background: var(--navy);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 830px;
  width: 100%;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-title {
  color: #ffffff;
  font-size: 16px;
  font-weight: normal;
  font-family: 'Cambria', 'Georgia', serif;
  letter-spacing: 0.02em;
}

.nav-tabs {
  display: flex;
  height: 100%;
}

.nav-tab {
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
  font-family: 'Cambria', 'Georgia', serif;
  padding: 0 16px;
  height: 100%;
  display: flex;
  align-items: center;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav-tab:hover {
  color: #ffffff;
}

.nav-tab.active {
  color: #ffffff;
  border-bottom: 3px solid #C9A227;
}

/* ── Main layout ─────────────────────────────── */

main.page {
  max-width: 830px;
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
  flex: 1;
  width: 100%;
}

/* ── Profile section ─────────────────────────── */

.profile-section {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.avatar-img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--navy);
  flex-shrink: 0;
}

.avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--navy-light);
  border: 3px solid var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  font-weight: normal;
  color: var(--navy);
  flex-shrink: 0;
  font-family: 'Cambria', 'Georgia', serif;
  letter-spacing: 0.05em;
}

.profile-info h1 {
  font-size: 26px;
  font-weight: normal;
  color: var(--text);
  margin-bottom: 4px;
  font-family: 'Cambria', 'Georgia', serif;
}

.profile-info .subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 14px;
  font-family: 'Cambria', 'Georgia', serif;
  font-style: italic;
}

/* ── Hiring Notice ─────────────────────────────── */

.hiring-notice {
  margin: 28px 0 36px;
  padding: 14px 18px;
  border: 1.5px solid #b42318;
  border-radius: 4px;
  background: #fff8f7;
  color: #333;
  font-size: 0.95rem;
  line-height: 1.6;
}

.hiring-notice strong {
  color: #b42318;
  font-weight: 600;
}

.hiring-notice a {
  margin-left: 4px;
  color: #b42318;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.hiring-notice a:hover {
  text-decoration: underline;
}

/* ── Social links ────────────────────────────── */

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--gold);
  text-decoration: none;
  border: 1px solid var(--gold);
  border-radius: 4px;
  padding: 3px 10px;
  transition: background 0.12s, color 0.12s;
  background: transparent;
  cursor: pointer;
}

.social-link:hover {
  background: #fdf6e3;
  color: var(--gold-hover);
  border-color: var(--gold-hover);
}

/* Email copy button */
.email-btn {
  position: relative;
  overflow: hidden;
}

.email-label,
.copied-label {
  transition: opacity 0.2s, transform 0.2s;
}

.copied-label {
  position: absolute;
  left: 50%;
  transform: translateX(-50%) translateY(100%);
  opacity: 0;
  white-space: nowrap;
  color: #2a7a2a;
}

.email-btn.copied .email-label {
  opacity: 0;
  transform: translateY(-100%);
}

.email-btn.copied .copied-label {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.email-btn.copied {
  border-color: #2a7a2a;
  color: #2a7a2a;
}

/* ── Section ─────────────────────────────────── */

.section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 18px;
  font-weight: bold;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
  padding-bottom: 7px;
  border-bottom: 2px solid var(--navy);
}

.pub-legend {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: -8px;
  margin-bottom: 16px;
}

.legend-pill {
  font-size: 11px;
  padding: 1px 9px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.legend-pill:hover {
  opacity: 0.8;
}

.filter-active {
  outline: 2px solid #fff;
  outline-offset: 1px;
}

.filter-dimmed {
  opacity: 0.3;
  filter: saturate(0);
}

.legend-sep {
  color: var(--text-muted);
  font-size: 14px;
}

.legend-note {
  font-size: 12px;
  font-style: italic;
  color: var(--text-muted);
  font-family: 'Cambria', 'Georgia', serif;
}

.filter-first-btn {
  font-size: 11px;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--navy);
  background: transparent;
  border: 1.5px solid var(--navy);
  border-radius: 4px;
  padding: 2px 10px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  line-height: normal;
  user-select: none;
}

.filter-first-btn.active {
  background: var(--navy);
  color: #fff;
}

.bio-text {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
}

.inline-link {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(181, 130, 10, 0.35);
  transition: border-color 0.12s;
}

.inline-link:hover {
  border-color: var(--gold);
}

/* ── CV entries ──────────────────────────────── */

.cv-entry {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 14px;
}

.cv-year {
  color: var(--text-muted);
  font-size: 14px;
  font-family: 'Cambria', 'Georgia', serif;
  min-width: 120px;
  padding-top: 2px;
  flex-shrink: 0;
}

.cv-title {
  font-size: 16px;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--text);
}

.cv-place {
  font-size: 14px;
  font-style: italic;
  color: var(--text-muted);
  margin-top: 1px;
}

.cv-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.5;
}

.service-subsection {
  font-size: 13px;
  font-weight: bold;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 16px 0 10px;
}

/* ── Publications ────────────────────────────── */

.pub-entry {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.pub-entry:first-of-type {
  border-top: 1px solid var(--border);
}

.pub-title {
  font-size: 16px;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.45;
}

.pub-authors {
  font-size: 14px;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.pub-authors strong {
  font-style: normal;
  color: var(--text);
}

.pub-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
}

/* Pill badges */
.pill {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-family: 'Cambria', 'Georgia', serif;
  padding: 2px 11px;
  border-radius: 999px;
  background: var(--navy);
  color: #e8ecf5;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.pill.workshop {
  background: #1a6b3a;
  color: #e4f5ec;
}

.pill.preprint {
  background: #555555;
  color: #f2f2f2;
}

.pill.journal {
  background: #d4a017;
  color: #3a2800;
}

.pill.demo {
  background: #b5460a;
  color: #fdeee8;
}

/* Publication links */
.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-family: 'Cambria', 'Georgia', serif;
  color: var(--gold);
  text-decoration: none;
  transition: color 0.12s;
}

.pub-link:hover {
  color: var(--gold-hover);
  text-decoration: underline;
}

/* ── Footer ──────────────────────────────────── */

.site-footer {
  background: var(--navy-light);
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.25rem;
  font-size: 13px;
  color: var(--text-muted);
  font-family: 'Cambria', 'Georgia', serif;
}

/* ── Responsive ──────────────────────────────── */

@media (max-width: 600px) {
  main.page {
    padding: 1.5rem 1.25rem 3rem;
  }

  .profile-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.25rem;
  }

  .social-links {
    justify-content: center;
  }

  .site-header {
    padding: 0 1rem;
  }

  .nav-tab {
    padding: 0 12px;
  }
}