:root {
  --ink: #172036;
  --muted: #5f6778;
  --accent: #8d2f3c;
  --accent-dark: #68212b;
  --paper: #ffffff;
  --soft: #f4f1ec;
  --line: #dcd8d1;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Libre Franklin", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

img {
  max-width: 100%;
}

.container {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.site-name {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.45rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
}

.menu-button {
  display: none;
  padding: 8px 12px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  font: inherit;
}

.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  align-items: center;
  gap: 90px;
  padding-block: 90px;
}

.eyebrow,
.section-label,
.course-level {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.77rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.14;
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(3.1rem, 7vw, 5.9rem);
  font-weight: 600;
  letter-spacing: -0.045em;
}

h2 {
  margin-top: 0;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  font-weight: 600;
}

.lead {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.6;
}

.narrow {
  max-width: 760px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-block;
  padding: 12px 20px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

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

.button.primary:hover {
  background: var(--accent-dark);
}

.button.secondary {
  color: var(--accent);
}

.portrait-wrap {
  position: relative;
}

.portrait-wrap::before {
  content: "";
  position: absolute;
  inset: 22px -22px -22px 22px;
  background: var(--soft);
  z-index: -1;
}

.portrait {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid var(--line);
}

.section {
  padding-block: 92px;
}

.muted-section {
  background: var(--soft);
}

.two-column {
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  gap: 80px;
}

.prose {
  max-width: 760px;
  color: #343b4a;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.16rem;
}

.prose p:first-child {
  margin-top: 0;
}

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

.cv-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 34px;
}

.cv-card p {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--muted);
}

.text-link,
.paper-links a {
  color: var(--accent);
  font-weight: 700;
  white-space: nowrap;
}

.page-main {
  padding-block: 74px 110px;
}

.page-header {
  padding-bottom: 65px;
  border-bottom: 1px solid var(--line);
}

.page-header h1 {
  max-width: 900px;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
}

.research-section,
.section-block {
  padding-top: 70px;
}

.paper {
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

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

.featured-paper {
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--soft);
}

.paper-heading {
  display: flex;
  justify-content: space-between;
  gap: 30px;
}

.paper h2 {
  margin-bottom: 8px;
  font-size: 1.62rem;
}

.paper-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 16px;
}

.paper-links a {
  font-size: 0.9rem;
}

.compact-paper .paper-links {
  margin-top: 16px;
}

.project-list,
.resource-list,
.profile-links {
  padding-left: 1.2rem;
}

.project-list li,
.resource-list li,
.profile-links li {
  margin-bottom: 12px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.course-card {
  padding: 28px;
}

.course-card h2 {
  min-height: 2.4em;
  font-size: 1.45rem;
}

.course-card > p:not(.course-level) {
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0;
}

.tag-row span {
  padding: 4px 9px;
  color: var(--muted);
  background: var(--soft);
  border-radius: 2px;
  font-size: 0.76rem;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.8fr;
  gap: 22px;
  padding-top: 70px;
}

.contact-card {
  min-height: 250px;
  padding: 30px;
}

.contact-card h2 {
  font-size: 1.4rem;
  overflow-wrap: anywhere;
}

.contact-card p,
.contact-card li {
  color: var(--muted);
}

.profile-links {
  list-style: none;
  padding: 0;
}

.availability {
  max-width: 780px;
  margin-top: 70px;
  padding-top: 45px;
  border-top: 1px solid var(--line);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.15rem;
}

.site-footer {
  padding-block: 30px;
  color: var(--muted);
  background: var(--soft);
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 25px;
}

.footer-wrap p {
  margin: 0;
}

@media (max-width: 820px) {
  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px 20px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
  }

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

  .site-nav a {
    width: 100%;
    padding: 12px 0;
  }

  .hero,
  .two-column,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 55px;
    padding-block: 65px;
  }

  .portrait-wrap {
    max-width: 460px;
  }

  .two-column {
    gap: 22px;
  }

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

  .paper-heading,
  .cv-card {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero,
  .section,
  .page-main {
    padding-block: 52px;
  }

  h1 {
    font-size: 3rem;
  }

  .featured-paper,
  .course-card,
  .contact-card,
  .cv-card {
    padding: 22px;
  }

  .footer-wrap {
    flex-direction: column;
  }
}