:root {
  --bg: #0b1120;
  --bg-alt: #0f172a;
  --surface: #131c31;
  --text: #e6edf5;
  --text-dim: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #34d399;
  --border: #1e293b;
  --max-width: 1080px;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 1000;
  transition: width 0.1s ease-out;
}

/* Navbar */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  background: rgba(11, 17, 32, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
}

.logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
}

.logo span { color: var(--accent); }

#nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

#nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

#nav-links a:hover { color: var(--accent); }

#nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

#nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  display: block;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 2rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.15), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(52, 211, 153, 0.12), transparent 45%),
    var(--bg);
  z-index: -1;
}

.hero-content { max-width: 720px; }

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-2);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.tagline {
  color: var(--accent);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
}

.tagline-sub {
  color: var(--text-dim);
  font-size: 0.98rem;
  font-weight: 500;
  margin: -0.6rem 0 1.25rem;
}

.hero-desc {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 2rem;
}

.hero-desc strong { color: var(--text); }

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.btn {
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #071018;
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(56,189,248,0.18);
}

/* Hero profile icons */
.hero-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 22px;
  margin: 0 0 2.5rem;
}

.icon-btn {
  position: relative;
  display: inline-flex;
  width: 48px;
  height: 48px;
  background: none;
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
}

.icon-btn img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.icon-btn:hover img,
.icon-btn:focus-visible img {
  transform: translateY(-3px) scale(1.08);
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
}

.icon-btn:focus-visible { outline: none; }

.icon-btn::after {
  content: attr(aria-label);
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: 5px 10px;
  border-radius: 6px;
  background: rgba(10, 20, 30, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 0.8rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
}

.icon-btn:hover::after,
.icon-btn:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.quote {
  font-style: italic;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.scroll-cue {
  position: absolute;
  bottom: 1.75rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 1.3rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* Sections */
.section { padding: 5.5rem 1.5rem; }

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

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 800;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.section-title .idx {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 600;
}

.section-lead {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 620px;
}

/* Section heading with an action next to the title */
.section-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.section-head .section-title { margin-bottom: 0; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.about-text strong { color: var(--text); }

/* Climate and Glacier Modelling Lab link */
.lab-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted var(--text-dim);
  transition: border-color 0.2s ease;
}

.lab-link:hover,
.lab-link:focus-visible {
  color: inherit;
  border-bottom-color: var(--text-dim);
  outline: none;
}

.timeline {
  border-left: 2px solid var(--border);
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline-item {
  position: relative;
  display: flex;
  flex-direction: column;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.6rem;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
}

.tl-year {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-2);
  font-size: 0.82rem;
}

.tl-title {
  font-weight: 600;
  margin-top: 0.15rem;
}

.tl-sub {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* Publications */
.pub-group { margin-bottom: 2.5rem; }

.pub-group-title {
  font-size: 1.05rem;
  color: var(--accent);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Reverse numbering: last item is 1, first item has the highest number */
.pub-list { counter-reset: pub var(--pub-start, 1); }

.pub-list > li {
  counter-increment: pub -1;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
}

.pub-list > li::before {
  content: counter(pub);
  flex: 0 0 auto;
  min-width: 1.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-2);
}

.pub-text {
  color: var(--text-dim);
  font-size: 0.92rem;
  flex: 1;
}

.pub-text em {
  color: var(--text);
  font-style: italic;
}

.pub-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.pub-link:hover { text-decoration: underline; }

/* Citation copy menu */
.cite-menu {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  margin-left: 0.45rem;
}

.cite-menu-all { margin-left: 0; }

.bib-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  width: 24px;
  height: 24px;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.bib-btn svg {
  width: 14px;
  height: 14px;
  display: block;
}

.bib-btn .ic-check { display: none; }

.cite-menu:hover .bib-btn,
.cite-menu.open .bib-btn,
.bib-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.bib-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.bib-btn.copied {
  color: var(--accent-2);
  border-color: var(--accent-2);
}

.bib-btn.copied .ic-copy { display: none; }
.bib-btn.copied .ic-check { display: block; }

/* "Copy all" pill button */
.cite-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.cite-all-btn svg {
  width: 15px;
  height: 15px;
  display: block;
}

.cite-all-btn .ic-check { display: none; }

.cite-menu:hover .cite-all-btn,
.cite-menu.open .cite-all-btn,
.cite-all-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.cite-all-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cite-all-btn.copied {
  color: var(--accent-2);
  border-color: var(--accent-2);
}

.cite-all-btn.copied .ic-copy { display: none; }
.cite-all-btn.copied .ic-check { display: block; }

/* Dropdown */
.cite-pop {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 50;
  min-width: 12.5rem;
  padding: 0.35rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
}

/* Invisible bridge so the menu stays open while the pointer crosses the gap */
.cite-pop::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: -8px;
  height: 8px;
}

.cite-menu-all .cite-pop { min-width: 17rem; }

.cite-menu.align-right .cite-pop {
  left: auto;
  right: 0;
}

.cite-menu:hover .cite-pop,
.cite-menu:has(:focus-visible) .cite-pop,
.cite-menu.open .cite-pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.cite-pop button {
  display: block;
  width: 100%;
  padding: 0.45rem 0.7rem;
  background: none;
  border: 0;
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.4;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.cite-pop button:hover,
.cite-pop button:focus-visible {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  outline: none;
}

.cite-pop button.done { color: var(--accent-2); }

.journal-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted var(--text-dim);
  transition: color 0.2s, border-color 0.2s;
}

.journal-link:hover,
.journal-link:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
  outline: none;
}

/* Awards */
.award-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.award-list li {
  display: flex;
  gap: 1.25rem;
  align-items: baseline;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.9rem;
  color: var(--text-dim);
}

.award-year {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-2);
  font-weight: 600;
  min-width: 3.5rem;
}

/* Contact */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.contact-item {
  flex: 0 1 calc((100% - 2rem) / 3);
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 84px;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.contact-item:hover,
.contact-item:focus-visible {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(56, 189, 248, 0.12);
  outline: none;
}

.contact-icon {
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.contact-icon img,
.contact-icon svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.contact-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.contact-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-value {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 900px) {
  .contact-item { flex-basis: calc((100% - 1rem) / 2); }
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }

  #nav-toggle { display: flex; }

  #nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-alt);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    border-bottom: 1px solid var(--border);
  }

  #nav-links.open { max-height: 320px; }

  #nav-links li { border-top: 1px solid var(--border); }

  #nav-links a { display: block; padding: 1rem 1.5rem; }
}

@media (max-width: 560px) {
  .contact-item { flex-basis: 100%; }
}