:root {
  --accent: #a51c30;
  --accent-dark: #7d1524;
  --ink: #17191d;
  --muted: #68707c;
  --background: #ffffff;
  --surface: #f6f8fa;
  --line: rgba(23, 25, 29, 0.12);
  --line-strong: rgba(23, 25, 29, 0.2);
  --footer: #f6f8fa;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body > .container,
.navbar > .container,
.footer > .container,
.site-container,
.publications-page {
  max-width: 840px;
}

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1100;
  padding: 0.55rem 0.8rem;
  color: #fff;
  background: var(--ink);
  border-radius: 0.25rem;
}

.skip-link:focus {
  color: #fff;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
  transition: color 150ms ease;
}

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 0.12rem;
}

p,
ul,
ol {
  margin-bottom: 1rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--ink);
  font-weight: 600;
  line-height: 1.25;
}

strong,
b {
  color: inherit;
  font-weight: 650;
}

em,
i {
  color: inherit;
}

code {
  padding: 0.12rem 0.3rem;
  color: var(--accent-dark);
  background: rgba(165, 28, 48, 0.07);
  border-radius: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

/* Header */
.site-header {
  z-index: 1020;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.navbar {
  min-height: 4.15rem;
  padding: 0.55rem 0;
  background: transparent !important;
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  margin-right: 1.25rem;
  color: var(--ink) !important;
}

.seas-logo {
  display: block;
  width: auto;
  height: 2.8rem;
}

.navbar-nav {
  align-items: center;
  gap: 0.05rem;
}

.nav-link {
  position: relative;
  padding: 0.45rem 0.55rem !important;
  color: var(--ink) !important;
  font-size: 0.86rem;
  font-weight: 450;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
  color: var(--accent) !important;
  text-decoration: none;
}

.nav-link.active {
  font-weight: 650;
}

.navbar-toggler {
  padding: 0.35rem;
  border: 0;
  border-radius: 0.2rem;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 2px rgba(165, 28, 48, 0.28);
}

/* Main layout */
main.mt-5 {
  margin-top: 2.7rem !important;
}

.content-sections {
  margin-top: 0;
}

.section {
  display: block;
  margin-bottom: 2.55rem;
}

.section-title {
  margin: 0 0 1.05rem;
  padding: 0 0 0.55rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  font-size: 1.48rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.section-title::after {
  display: none;
}

.section-title small {
  margin-left: 0.35rem;
  font-size: 0.76rem;
  font-weight: 400;
}

.section-content {
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.65;
}

.section-content p:last-child,
.section-content ul:last-child,
.section-content ol:last-child {
  margin-bottom: 0;
}

.section-content li {
  margin-bottom: 0.36rem;
}

.section-content ul ul,
.section-content ol ol,
.section-content ul ol,
.section-content ol ul {
  margin-top: 0.45rem;
  margin-bottom: 0.7rem;
}

/* Home profile */
.hero-section {
  margin-bottom: 2.7rem !important;
  padding: 0 0 2.6rem;
  border-bottom: 1px solid var(--line);
}

.hero-section .row {
  align-items: flex-start !important;
}

.hero-photo {
  order: 2;
}

.hero-section .col-lg-8 {
  order: 1;
}

.profile-image-container {
  text-align: right;
}

.profile-image-container img {
  width: 100%;
  max-width: 235px;
  height: auto;
  border: 0;
  border-radius: 0.22rem;
  box-shadow: 0 2px 8px rgba(23, 25, 29, 0.2) !important;
}

.photo-credit {
  max-width: 235px;
  margin: 0.45rem 0 0 auto;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.35;
  text-align: right;
}

.hero-content {
  padding-top: 0.1rem;
}

.hero-content .eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-content h1,
.hero-content .display-4 {
  margin-bottom: 0.3rem !important;
  color: var(--ink);
  font-size: clamp(2.2rem, 6vw, 3rem);
  font-weight: 550 !important;
  letter-spacing: -0.045em;
}

.hero-content h2 {
  margin-bottom: 0.2rem !important;
  color: var(--muted) !important;
  font-size: 1.18rem;
  font-weight: 400;
}

.hero-content h3 {
  max-width: 31rem;
  margin-bottom: 1.25rem !important;
  color: var(--ink);
  font-size: 0.96rem;
  font-weight: 450;
  line-height: 1.5;
}

.contact-info {
  margin-bottom: 1.1rem !important;
  color: var(--muted);
  font-size: 0.88rem;
}

.contact-info p {
  margin-bottom: 0.28rem !important;
}

.contact-info i {
  width: 1.15rem;
  color: var(--ink);
  text-align: center;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.social-links .btn,
.scholar-link {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  margin: 0 !important;
  padding: 0.28rem 0.62rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0.2rem;
  font-size: 0.78rem;
  font-weight: 500;
}

.social-links .btn:hover,
.social-links .btn:focus,
.scholar-link:hover,
.scholar-link:focus {
  color: var(--accent);
  background: transparent;
  border-color: var(--accent);
  box-shadow: none;
  text-decoration: none;
  transform: none;
}

/* News */
.news-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  display: grid;
  grid-template-columns: 7.2rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.75rem 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
}

.news-item:first-child {
  padding-top: 0;
}

.news-item:last-child {
  border-bottom: 0;
}

.news-date {
  min-width: 0;
  color: var(--accent);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  white-space: nowrap;
}

.news-content {
  color: var(--ink);
  line-height: 1.55;
}

.news-content a {
  padding: 0;
  color: var(--accent);
  background: transparent;
  font-weight: 400;
}

.news-content a:hover {
  color: var(--accent-dark);
  background: transparent;
}

.news-timeline--compact .news-item {
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 0.55rem 0;
}

/* Calls to action */
.alert {
  margin-bottom: 1.5rem;
  padding: 0.9rem 1rem;
  color: var(--ink);
  background: rgba(165, 28, 48, 0.055);
  border: 0;
  border-left: 3px solid var(--accent);
  border-radius: 0.15rem;
}

.alert-primary,
.alert-warning {
  color: var(--ink);
  background: rgba(165, 28, 48, 0.055);
  border-color: var(--accent);
}

.alert a,
.alert .alert-link {
  color: var(--accent-dark);
}

/* Research and people */
.research-areas {
  padding-left: 1.25rem;
}

.research-areas > li {
  margin-bottom: 0.9rem;
}

#researchHigh .section-content > ul,
#artifacts .section-content > ul {
  padding-left: 1.25rem;
}

.research-highlights,
.research-highlights-compact {
  margin-top: 1rem;
}

.research-highlights li,
.highlight-item {
  margin-bottom: 0.8rem;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
}

.student-categories,
.service-categories,
.talks-list {
  margin-top: 1rem;
}

.student-category,
.service-category,
.talk-item {
  margin-bottom: 2rem;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
}

.student-category h3,
.service-category h3,
.talk-item h4 {
  margin: 1.7rem 0 0.8rem;
  padding-bottom: 0.4rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  font-size: 1.05rem;
  font-weight: 600;
}

.student-category h4 {
  margin: 1.4rem 0 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.awards-list {
  padding-left: 1.15rem;
  list-style: disc;
}

.awards-list li {
  margin-bottom: 0.45rem;
  padding: 0;
  background: transparent;
  border: 0;
}

/* Publications */
.publications-page {
  margin-top: 2.7rem !important;
}

.publications-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.3rem;
  border-bottom: 1px solid var(--line);
}

.publications-header .section-title {
  margin: 0;
  border: 0;
}

.publications-list {
  margin-top: 0;
}

.year-group {
  margin-bottom: 2.4rem;
}

.year-label {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0 0 1.15rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  line-height: 1;
  text-transform: uppercase;
}

.year-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.paper-li {
  position: relative;
  margin: 0;
  padding: 0 0 1.2rem;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
  transition: none;
}

.paper-li + .paper-li {
  padding-top: 1.2rem;
}

.paper-li::before {
  display: none;
}

.paper-li:hover {
  border-color: var(--line);
  box-shadow: none;
  transform: none;
}

.paper-li p {
  margin: 0;
  color: #3f454e;
  font-size: 0.9rem;
  line-height: 1.55;
}

.paper-name {
  display: inline;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.38;
}

.paper-name:hover,
.paper-name:focus {
  color: var(--accent);
  background: transparent;
}

.paper-li strong {
  display: inline-block;
  margin-top: 0.3rem;
  padding: 0.08rem 0.45rem;
  color: #fff;
  background: var(--accent);
  border-radius: 0.15rem;
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.045em;
  line-height: 1.55;
  text-transform: uppercase;
}

.paper-li em {
  color: #4e5661;
  background: transparent;
  font-style: italic;
}

.paper-link {
  display: inline-flex;
  align-items: center;
  margin: 0.35rem 0.14rem 0 0;
  padding: 0.08rem 0.48rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0.15rem;
  font-size: 0.7rem;
  font-weight: 550;
  line-height: 1.55;
  text-transform: lowercase;
}

.paper-link:hover,
.paper-link:focus {
  color: var(--accent);
  background: transparent;
  border-color: var(--accent);
  text-decoration: none;
  transform: none;
}

.paper-emphasis {
  display: block;
  margin-top: 0.55rem;
  padding: 0;
  color: #8a5c00;
  background: transparent;
  border: 0;
  font-size: 0.82rem;
  font-weight: 500;
}

.paper-emphasis::before {
  color: #c58900;
  content: "★";
  margin-right: 0.35rem;
}

.paper-emphasis.award::before {
  content: "★";
}

/* Open source and teaching */
#open-source .open-source-lead,
#teaching .course-lead {
  margin-bottom: 1.3rem;
  color: var(--muted);
}

#open-source .section-content > h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 2rem 0 1rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

#open-source .section-content > h3::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

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

.open-source-item,
#open-source .open-source-item,
#teaching .course-item {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 1.1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.2rem;
  box-shadow: none;
  transition: border-color 150ms ease;
}

.open-source-item:hover,
#open-source .open-source-item:hover,
#teaching .course-item:hover {
  border-color: var(--line-strong);
  box-shadow: none;
  transform: none;
}

.open-source-header,
#open-source .open-source-header,
#teaching .course-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.7rem;
  row-gap: 0.08rem;
  align-items: start;
  margin-bottom: 0.65rem;
}

.open-source-header i,
#open-source .open-source-header i,
#teaching .course-header i {
  grid-row: 1 / span 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin: 0 !important;
  padding: 0;
  color: var(--accent);
  background: rgba(165, 28, 48, 0.08);
  border-radius: 0.18rem;
  font-size: 0.9rem;
}

.open-source-title,
#open-source .open-source-title,
#teaching .course-title {
  margin: 0;
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 650;
  line-height: 1.35;
}

.open-source-title:hover,
#open-source .open-source-title:hover,
#teaching .course-title:hover {
  color: var(--accent);
}

.open-source-subtitle,
#open-source .open-source-subtitle,
#teaching .course-subtitle {
  min-width: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-style: normal;
  line-height: 1.4;
}

.open-source-description,
#open-source .open-source-description,
#teaching .course-description {
  margin: 0;
  color: #444b55;
  font-size: 0.86rem;
  line-height: 1.55;
}

#teaching .course-facts {
  margin-top: auto;
  padding-top: 0.75rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

#teaching .course-fact-label {
  color: var(--ink);
  font-weight: 600;
}

/* FAQ */
.faq-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.faq-item:first-child {
  padding-top: 0;
}

.faq-question {
  margin: 0 0 0.55rem;
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 650;
}

.faq-answer {
  color: #444b55;
  font-size: 0.93rem;
}

.faq-answer p:last-child,
.faq-answer ul:last-child {
  margin-bottom: 0;
}

/* Media */
.section-content iframe {
  width: 100%;
  max-width: 700px;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 0.18rem;
}

/* Footer */
.footer {
  margin-top: 4rem;
  color: #4f5661;
  background: var(--footer);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

.footer .row {
  align-items: center;
  row-gap: 0.75rem;
}

.footer-identity {
  color: #4f5661;
}

.footer-link {
  color: var(--accent-dark);
  font-weight: 500;
}

.footer-link:hover {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 991.98px) {
  .navbar-nav {
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 0 0.25rem;
    border-top: 1px solid var(--line);
  }

  .nav-link {
    padding: 0.55rem 0 !important;
  }
}

@media (max-width: 767.98px) {
  body {
    font-size: 0.97rem;
  }

  main.mt-5,
  .publications-page {
    margin-top: 2rem !important;
  }

  .hero-photo,
  .hero-section .col-lg-8 {
    order: initial;
  }

  .hero-photo {
    margin-bottom: 1.5rem !important;
  }

  .profile-image-container,
  .photo-credit {
    text-align: left;
  }

  .profile-image-container img {
    max-width: 205px;
  }

  .photo-credit {
    margin-right: auto;
    margin-left: 0;
  }

  .hero-section .row {
    display: flex;
    flex-direction: column-reverse;
  }

  .hero-section {
    padding-bottom: 2rem;
  }

  .section {
    margin-bottom: 2.15rem;
  }

  .open-source-grid,
  #open-source .open-source-grid,
  #teaching .course-grid {
    grid-template-columns: 1fr;
  }

  .publications-header {
    flex-direction: column;
    gap: 0.6rem;
    padding-bottom: 0.75rem;
  }

  .publications-header .section-title {
    padding-bottom: 0;
  }

  .footer .ms-auto {
    margin-left: 0 !important;
  }

  .footer ul {
    flex-wrap: wrap;
    gap: 0.5rem 1rem !important;
  }
}

@media (max-width: 575.98px) {
  .navbar > .container,
  main.container,
  .footer > .container {
    padding-right: 1.2rem;
    padding-left: 1.2rem;
  }

  .hero-content h1,
  .hero-content .display-4 {
    font-size: 2.25rem;
  }

  .section-title {
    font-size: 1.32rem;
  }

  .seas-logo {
    height: 2.45rem;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .news-date {
    display: block;
    margin-bottom: 0.1rem;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .site-header,
  .footer,
  .social-links,
  .skip-link {
    display: none !important;
  }

  body,
  a {
    color: #000 !important;
  }

  main.container {
    max-width: none;
    margin-top: 0 !important;
  }
}