:root {
  --ink: #161616;
  --ink-soft: #525252;
  --muted: #525252;
  --paper: #f4f4f4;
  --paper-light: #ffffff;
  --teal: #1a4480;
  --teal-dark: #162e51;
  --teal-pale: #d4e5ff;
  --seafoam: #98afd2;
  --copper: #7a591a;
  --copper-bright: #ffbe2e;
  --line: rgba(22, 46, 81, 0.22);
  --line-light: rgba(255, 255, 255, 0.28);
  --sans: Inter, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --content: 1240px;
  --text-size: 1rem;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 17px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: var(--text-size);
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  color: #fff;
  background: var(--teal);
}

a {
  color: var(--teal);
  text-decoration-color: rgba(26, 68, 128, 0.42);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--copper);
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 4px;
}

img {
  display: block;
  max-width: 100%;
}

p {
  text-wrap: pretty;
}

.container {
  width: min(calc(100% - 4rem), var(--content));
  margin-inline: auto;
}

nav {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  display: flex;
  min-height: var(--nav-height);
  align-items: center;
  justify-content: flex-end;
  gap: clamp(1.1rem, 2.6vw, 2.5rem);
  padding-inline: max(2rem, calc((100vw - var(--content)) / 2));
  border-bottom: 1px solid var(--line-light);
  background: rgba(22, 22, 22, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

nav a {
  position: relative;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

nav a::after {
  position: absolute;
  right: 0;
  bottom: 7px;
  left: 0;
  height: 1px;
  background: var(--copper-bright);
  content: "";
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 160ms ease, transform 160ms ease;
}

nav a:hover,
nav a[aria-current="true"] {
  color: #fff;
}

nav a:hover::after,
nav a[aria-current="true"]::after {
  opacity: 1;
  transform: scaleX(1);
}

header {
  position: relative;
  isolation: isolate;
  min-height: max(100svh, 760px);
  overflow: hidden;
  color: var(--paper);
  background:
    linear-gradient(90deg, rgba(22, 22, 22, 0.96) 0%, rgba(22, 46, 81, 0.82) 50%, rgba(22, 46, 81, 0.18) 100%),
    linear-gradient(180deg, rgba(22, 22, 22, 0.02) 38%, rgba(22, 22, 22, 0.74) 100%),
    url("assets/fluid-vorticity-hero-4k.webp") center / cover no-repeat,
    var(--teal-dark);
}

header::after {
  position: absolute;
  z-index: -1;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.3);
  content: "";
}

.hero {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: 1fr auto;
  column-gap: 1.5rem;
  min-height: max(100svh, 760px);
  align-items: end;
  padding-top: calc(var(--nav-height) + 6rem);
  padding-bottom: clamp(3rem, 6vw, 5.5rem);
}

.hero > div {
  grid-column: 1 / span 8;
  grid-row: 2;
}

.hero img {
  grid-column: 10 / span 3;
  grid-row: 2;
  width: 100%;
  height: clamp(250px, 23vw, 360px);
  aspect-ratio: 1 / 1;
  border: 1px solid rgba(255, 255, 255, 0.42);
  object-fit: cover;
  object-position: center 25%;
}

.position {
  max-width: 48ch;
  margin: 0 0 1.1rem;
  color: var(--copper-bright);
  font-size: var(--text-size);
  font-weight: 600;
  line-height: 1.45;
}

.hero h1 {
  max-width: 11ch;
  margin: 0;
  color: var(--paper-light);
  font-size: clamp(3.4rem, 5.4vw, 5.8rem);
  font-weight: 450;
  letter-spacing: -0.065em;
  line-height: 0.9;
}

.hero .hero-intro {
  max-width: 66ch;
  margin: 2rem 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: var(--text-size);
  line-height: inherit;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.4rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.28);
}

.hero-link {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  border-bottom: 1px solid transparent;
  color: var(--paper);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.025em;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease;
}

.hero-link:hover {
  border-bottom-color: var(--copper-bright);
  color: var(--copper-bright);
}

main {
  overflow: clip;
}

section {
  padding-block: clamp(5.5rem, 9vw, 9rem);
  border-bottom: 1px solid var(--line);
}

section:nth-of-type(even) {
  background: var(--paper-light);
}

#contact {
  min-height: calc(100svh - var(--nav-height));
}

h2,
h3,
h4 {
  margin-top: 0;
  color: var(--ink);
}

h2 {
  margin-bottom: clamp(3.5rem, 7vw, 7rem);
  font-size: clamp(2.6rem, 4.4vw, 4.5rem);
  font-weight: 450;
  letter-spacing: -0.05em;
  line-height: 0.95;
}

h3,
h4 {
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.section-intro,
.direction-body p,
.software-card p,
.course-card p,
.contact-item p,
.publication-list li {
  font-size: var(--text-size);
}

.section-intro {
  max-width: 70ch;
  margin: 0 0 clamp(4rem, 7vw, 6.5rem) calc(33.333% + 0.5rem);
  color: var(--ink-soft);
}

.content-group,
.publication-group {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.subsection-title,
.publication-group > h3 {
  grid-column: 1 / span 3;
  max-width: 13ch;
  margin: 0;
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
  text-transform: none;
}

.research-list,
.publication-list {
  grid-column: 5 / span 8;
}

.research-direction {
  padding: 0 0 clamp(3.25rem, 5vw, 4.5rem);
}

.research-direction + .research-direction {
  padding-top: clamp(3.25rem, 5vw, 4.5rem);
  border-top: 1px solid var(--line);
}

.direction-label h4 {
  max-width: 30ch;
  margin-bottom: 1.25rem;
  font-size: clamp(1.25rem, 1.5vw, 1.45rem);
}

.direction-body > p {
  margin-top: 0;
  color: var(--ink-soft);
}

.direction-body > p:last-child {
  margin-bottom: 0;
}

.representative-work {
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
  color: var(--muted) !important;
}

.representative-work strong {
  color: var(--ink);
}

.software-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(3rem, 7vw, 7rem);
}

.software-card {
  display: flex;
  min-height: 180px;
  flex-direction: column;
  padding: 1.75rem 0 2.75rem;
  border-top: 1px solid var(--line);
}

.software-card h3,
.course-card h3,
.contact-item h3 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.25rem, 1.5vw, 1.45rem);
}

.software-card h3 a {
  color: var(--ink);
  text-decoration-color: rgba(22, 46, 81, 0.28);
}

.software-card p {
  max-width: 48ch;
  margin: 0;
  color: var(--ink-soft);
}

.software-links {
  display: flex;
  gap: 1.4rem;
  margin-top: auto;
  padding-top: 1.5rem;
}

.software-links a {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.teaching-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(3rem, 7vw, 7rem);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  column-gap: clamp(2rem, 5vw, 5rem);
}

.course-card,
.contact-item {
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}

.course-card h3 {
  max-width: 27ch;
}

.course-meta {
  margin: 0 0 1.25rem;
  color: var(--ink-soft);
}

.course-card p:last-child {
  max-width: 52ch;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.contact-item p {
  max-width: 34ch;
  margin: 0;
  color: var(--ink-soft);
}

.publication-group + .publication-group {
  margin-top: clamp(4.5rem, 8vw, 8rem);
}

.publication-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.publication-list li {
  margin: 0;
  padding: 0 0 1.35rem;
  color: var(--muted);
}

.publication-list li + li {
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.publication-list strong,
.publication-list em,
.publication-title {
  color: var(--ink);
  font-family: inherit;
  font-size: inherit;
}

footer {
  padding: 2rem max(2rem, calc((100vw - var(--content)) / 2));
  color: rgba(255, 255, 255, 0.66);
  background: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
}

footer p {
  margin: 0;
}

@media (max-width: 960px) {
  .hero > div {
    grid-column: 1 / span 9;
  }

  .hero img {
    grid-column: 10 / span 3;
  }
}

@media (max-width: 700px) {
  :root {
    --nav-height: 58px;
  }

  html {
    font-size: 16px;
  }

  .container {
    width: min(calc(100% - 2rem), var(--content));
  }

  nav {
    justify-content: flex-start;
    gap: 1.25rem;
    overflow-x: auto;
    padding-inline: 1rem;
    scrollbar-width: none;
  }

  nav::-webkit-scrollbar {
    display: none;
  }

  nav a {
    flex: 0 0 auto;
    font-size: 0.67rem;
  }

  header {
    min-height: auto;
    background:
      linear-gradient(180deg, rgba(22, 22, 22, 0.42) 0%, rgba(22, 46, 81, 0.78) 42%, rgba(22, 22, 22, 0.96) 100%),
      url("assets/fluid-vorticity-hero-mobile.webp") 58% center / cover no-repeat,
      var(--teal-dark);
  }

  .hero {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    row-gap: 2.75rem;
    min-height: auto;
    padding-top: calc(var(--nav-height) + 3.5rem);
    padding-bottom: 3.5rem;
  }

  .hero img {
    grid-column: 1;
    grid-row: 1;
    width: min(42vw, 170px);
    height: min(42vw, 170px);
    justify-self: end;
  }

  .hero > div {
    grid-column: 1;
    grid-row: 2;
  }

  .hero h1 {
    max-width: 9ch;
    font-size: clamp(3.15rem, 15vw, 5.1rem);
  }

  .hero .hero-intro {
    margin-top: 1.6rem;
  }

  .hero-links {
    gap: 0 1.1rem;
  }

  section {
    padding-block: 4.75rem;
  }

  h2 {
    margin-bottom: 3.5rem;
    font-size: clamp(2.5rem, 12vw, 3.6rem);
  }

  .section-intro {
    margin: 0 0 4rem;
  }

  .content-group,
  .publication-group {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .subsection-title,
  .research-list,
  .publication-group > h3,
  .publication-list {
    grid-column: 1;
  }

  .subsection-title,
  .publication-group > h3 {
    max-width: none;
  }

  .research-direction {
    padding-bottom: 3.25rem;
  }

  .research-direction + .research-direction {
    padding-top: 3.25rem;
  }

  .software-grid,
  .teaching-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .software-card {
    min-height: 0;
  }

  .course-card + .course-card,
  .contact-item + .contact-item {
    margin-top: 3.5rem;
  }

  footer {
    padding-inline: 1rem;
  }
}

@media (max-width: 390px) {
  .hero h1 {
    font-size: 3.2rem;
  }

  .hero-link {
    min-height: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  nav,
  .hero-links {
    display: none;
  }

  html,
  body {
    color: #000;
    background: #fff;
    font-size: 10.5pt;
  }

  header,
  section {
    min-height: 0;
    padding-block: 2rem;
    color: #000;
    background: #fff !important;
  }

  .hero {
    min-height: 0;
    padding-block: 2rem;
  }

  .hero h1,
  .hero .hero-intro,
  .position {
    color: #000;
  }

  .hero img {
    width: 140px;
  }
}