/* ============================================================
   VARIABLES
   ============================================================ */
:root {
  --accent:       #1d4ed8;
  --accent-light: #dbeafe;
  --text:         #1f2937;
  --muted:        #6b7280;
  --bg:           #ffffff;
  --bg-alt:       #f9fafb;
  --border:       #e5e7eb;
  --nav-h:        60px;
  --max-w:        860px;
  --radius:       6px;
}

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

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1 { font-size: 2.25rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

h3 { font-size: 1rem; font-weight: 600; }

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

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

sup { font-size: 0.7em; vertical-align: super; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4rem 0;
  scroll-margin-top: var(--nav-h);
}

.alt-bg { background: var(--bg-alt); }

/* ============================================================
   NAV
   ============================================================ */
#navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-name {
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-name:hover { text-decoration: none; }

#nav-links {
  display: flex;
  list-style: none;
  gap: 0.1rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  margin-left: auto;
}
#nav-links::-webkit-scrollbar { display: none; }

#nav-links a {
  display: block;
  padding: 0.3rem 0.6rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
#nav-links a:hover,
#nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

#menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  font-size: 1.05rem;
  padding: 0.4rem 0.5rem;
  margin-left: auto;
  border-radius: var(--radius);
}
#menu-toggle:hover { background: var(--bg-alt); }

/* ============================================================
   HERO / PROFILE
   ============================================================ */
#about {
  padding-top: calc(var(--nav-h) + 3rem);
  padding-bottom: 3rem;
}

.profile {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.profile-photo { flex-shrink: 0; }

.profile-photo img {
  width: 148px;
  height: 148px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--border);
  display: block;
}

.profile-info h1 { margin-bottom: 0.2rem; }

.profile-title {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.profile-affiliation {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.profile-supervisors {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  background: white;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.btn-link:hover {
  background: var(--accent);
  color: white;
  text-decoration: none;
}

.bio {
  border-left: 3px solid var(--accent-light);
  padding-left: 1.25rem;
  font-size: 0.95rem;
}
.bio a { font-weight: 500; }

/* ============================================================
   SHARED: ITEM LIST (news, talks, awards)
   ============================================================ */
.item-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.item-list li {
  display: flex;
  gap: 1.25rem;
  align-items: baseline;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 0;
}
.item-list li:first-child { padding-top: 0; }
.item-list li:last-child  { border-bottom: none; padding-bottom: 0; }

.date, .date-range {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 4.5rem;
}

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.section-note {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1.75rem;
  margin-top: -0.75rem;
}

.pub-year-group { margin-bottom: 2rem; }
.pub-year-group:last-child { margin-bottom: 0; }

.year-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.pub-item {
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: white;
  transition: box-shadow 0.15s;
}
.pub-item:hover { box-shadow: 0 2px 10px rgba(0,0,0,0.07); }

.featured-pub { border-left: 3px solid var(--accent); }

.pub-badges {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 0.45rem;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.badge-venue { background: var(--accent); color: white; }
.badge-oral  { background: #dc2626;       color: white; }

.pub-title {
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.25rem;
  line-height: 1.45;
}
.pub-title a            { color: var(--text); }
.pub-title a:hover      { color: var(--accent); text-decoration: none; }

.pub-authors {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 0.15rem;
}
.pub-venue {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
  margin: 0;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  background: white;
  overflow: hidden;
  transition: box-shadow 0.15s;
  display: flex;
  flex-direction: column;
}
.project-card:hover { box-shadow: 0 2px 10px rgba(0,0,0,0.07); }

.project-img {
  width: calc(100% + 2.4rem);
  margin: -1.2rem -1.2rem 1rem;
  height: 159px;
  flex-shrink: 0;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius) var(--radius) 0 0;
  display: block;
}

.project-card h3 { margin-bottom: 0.5rem; }

.project-card p {
  font-size: 0.865rem;
  color: var(--muted);
  flex-grow: 1;
  margin-bottom: 0.85rem;
}

.btn-link-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
}
.btn-link-sm:hover { text-decoration: underline; }

/* Inline figure below a talks/tutorials list entry */
.entry-img {
  display: block;
  margin-top: 0.65rem;
  width: 80%;
  max-width: 500px;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ============================================================
   TALKS SUBSECTION HEADINGS
   ============================================================ */
.subsection-heading {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2rem;
  margin-bottom: 0.25rem;
}

/* ============================================================
   EXPERIENCE & EDUCATION
   ============================================================ */
.exp-edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.timeline {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.timeline li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.timeline .date-range { min-width: 8rem; padding-top: 0.05rem; }

.timeline li > div {
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
footer p { font-size: 0.83rem; color: var(--muted); }
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); text-decoration: underline; }

/* ============================================================
   RESPONSIVE — tablet
   ============================================================ */
@media (max-width: 720px) {
  h1 { font-size: 1.8rem; }

  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }
  .profile-links { justify-content: center; }
  .bio { border-left: none; border-top: 3px solid var(--accent-light); padding-left: 0; padding-top: 1rem; }

  .exp-edu-grid { grid-template-columns: 1fr; gap: 2rem; }

  section { padding: 2.75rem 0; }
  #about  { padding-top: calc(var(--nav-h) + 1.75rem); }
}

/* ============================================================
   RESPONSIVE — mobile
   ============================================================ */
@media (max-width: 540px) {
  #menu-toggle { display: block; }

  #nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 0.6rem 1.25rem 0.9rem;
    gap: 0.1rem;
    z-index: 999;
    margin-left: 0;
  }
  #nav-links.open { display: flex; }

  .nav-inner { position: relative; }

  /* In mobile nav, name takes all space; button pushed to right */
  .nav-name { flex: 1; }

  .item-list li { flex-direction: column; gap: 0.2rem; }
  .timeline li  { flex-direction: column; gap: 0.2rem; }

  .project-grid { grid-template-columns: 1fr; }

  .pub-item { padding: 0.75rem 0.9rem; }
}