:root {
  --ink: #1f2933;
  --muted: #53616d;
  --soft: #f7f8f6;
  --paper: #ffffff;
  --navy: #152033;
  --navy-soft: #22304a;
  --line: #d9dee5;
  --accent: #2f6f73;
  --accent-dark: #24585b;
  --focus: #f0c75e;
  --shadow: 0 18px 45px rgba(21, 32, 51, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.65;
}

body.nav-open {
  overflow: hidden;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--navy);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

h1,
h2,
h3,
.brand,
.button,
.site-nav,
.eyebrow {
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 1.04;
  font-weight: 760;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.7rem, 2.5vw, 2.25rem);
  line-height: 1.2;
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.08rem;
  line-height: 1.35;
}

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

.container {
  width: min(100% - 2rem, 1120px);
  margin-inline: auto;
}

.narrow {
  max-width: 820px;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 30;
  transform: translateY(-150%);
  border-radius: var(--radius);
  background: var(--focus);
  color: var(--navy);
  padding: 0.55rem 0.8rem;
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--navy);
  color: #fff;
  box-shadow: 0 2px 18px rgba(9, 15, 27, 0.16);
}

.nav-shell {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  color: #fff;
  text-decoration: none;
}

.brand span {
  font-weight: 760;
  line-height: 1.1;
}

.brand small {
  margin-top: 0.12rem;
  color: #cbd5df;
  font-size: 0.78rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.92rem;
}

.site-nav a {
  border-radius: 999px;
  color: #edf2f7;
  padding: 0.45rem 0.68rem;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.site-nav .nav-muted {
  color: #bbc7d4;
}

.nav-muted span {
  display: block;
  font-size: 0.66rem;
  line-height: 1.1;
  opacity: 0.82;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero,
.page-hero {
  background: linear-gradient(180deg, #fff 0%, var(--soft) 100%);
}

.hero {
  padding: clamp(4rem, 8vw, 7.5rem) 0 clamp(3.5rem, 7vw, 6rem);
}

.page-hero {
  border-bottom: 1px solid var(--line);
  padding: clamp(3.5rem, 7vw, 5.6rem) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero-copy p {
  max-width: 760px;
}

.eyebrow {
  margin-bottom: 0.7rem;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: uppercase;
}

.lead {
  color: var(--navy);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(1.12rem, 2vw, 1.38rem);
  line-height: 1.45;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--navy);
  padding: 0.62rem 0.95rem;
  font-size: 0.95rem;
  font-weight: 760;
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.button:hover {
  border-color: var(--accent);
  color: var(--navy);
  transform: translateY(-1px);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.primary:hover {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: #fff;
}

.profile-panel,
.side-panel,
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.profile-panel {
  padding: 1rem;
}

.profile-photo {
  display: block;
  width: min(100%, 220px);
  height: auto;
  margin-inline: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  object-position: center top;
  box-shadow: 0 14px 32px rgba(21, 32, 51, 0.12);
}

.profile-placeholder {
  display: grid;
  min-height: 290px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #eef5f3;
  color: var(--accent-dark);
}

.profile-placeholder span {
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 2.4rem;
  font-weight: 780;
}

.quick-facts,
.contact-list {
  display: grid;
  gap: 0.95rem;
  margin: 1.1rem 0 0;
}

.quick-facts div,
.contact-list div {
  display: grid;
  gap: 0.15rem;
}

dt {
  color: var(--muted);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.76rem;
  font-weight: 760;
  text-transform: uppercase;
}

dd {
  margin: 0;
}

.section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.muted-section {
  border-block: 1px solid var(--line);
  background: #fff;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.6rem;
}

.section-heading p {
  max-width: 580px;
  color: var(--muted);
}

.section-heading.compact {
  display: block;
  margin-bottom: 1rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card,
.publication-card,
.course-card,
.cv-section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.topic-card {
  padding: 1.15rem;
}

.topic-card p,
.course-card p,
.pub-meta,
.pub-status,
.theme-note,
.institution-heading p,
.footer-meta {
  color: var(--muted);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.side-panel {
  align-self: start;
  padding: 1.4rem;
}

.text-link {
  display: inline-flex;
  margin-top: 1rem;
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-weight: 760;
}

.research-stack,
.publication-sections,
.teaching-stack,
.cv-layout {
  display: grid;
  gap: 1.4rem;
}

.research-theme {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  padding-top: 1.8rem;
}

.theme-number {
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-weight: 760;
}

.theme-note {
  border-left: 3px solid var(--accent);
  margin-top: 1rem;
  padding-left: 1rem;
}

.publication-section {
  scroll-margin-top: 96px;
}

.publication-list {
  display: grid;
  gap: 0.9rem;
}

.compact-list {
  gap: 0.75rem;
}

.publication-card {
  padding: 1.1rem 1.2rem;
}

.publication-card h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.08rem;
}

.pub-meta,
.pub-status,
.pub-links {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.pub-links {
  margin-top: 0.3rem;
}

.institution-block {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.institution-heading {
  display: grid;
  gap: 0.1rem;
  margin-bottom: 1rem;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.course-grid.single {
  grid-template-columns: minmax(0, 1fr);
}

.course-card {
  padding: 1rem;
}

.cv-section {
  padding: clamp(1.1rem, 3vw, 1.5rem);
}

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline article {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

.timeline-date {
  margin-bottom: 0.2rem;
  color: var(--accent-dark);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.86rem;
  font-weight: 760;
}

.clean-list {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

.detail-grid,
.contact-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.contact-card {
  padding: 1.4rem;
}

.contact-actions {
  margin-top: 1.3rem;
}

.minimal-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 2rem;
}

.minimal-page p {
  color: var(--ink);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.05rem;
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--navy);
  color: #e8eef6;
  padding: 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) auto auto;
  align-items: center;
  gap: 1.5rem;
}

.site-footer a {
  color: #e8eef6;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.9rem;
}

.footer-meta {
  justify-self: end;
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    inset: 76px 0 auto 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    background: var(--navy);
    padding: 0.75rem 1rem 1rem;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    border-radius: var(--radius);
    padding: 0.7rem 0.75rem;
  }

  .nav-muted span {
    display: inline;
    margin-left: 0.35rem;
  }


  .profile-photo {
    width: min(100%, 200px);
  }

  .hero-grid,
  .split-layout,
  .research-theme,
  .detail-grid,
  .contact-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .card-grid.four,
  .course-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-meta {
    justify-self: start;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .container {
    width: min(100% - 1.25rem, 1120px);
  }

  .nav-shell {
    min-height: 68px;
  }

  .site-nav {
    inset: 68px 0 auto 0;
  }

  .hero,
  .page-hero,
  .section {
    padding-block: 2.7rem;
  }

  .button-row,
  .button {
    width: 100%;
  }

  .button {
    justify-content: center;
  }

  .card-grid.four,
  .course-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    display: block;
  }


  .profile-photo {
    width: min(100%, 165px);
  }

  .profile-placeholder {
    min-height: 220px;
  }
}