:root {
  --ink: #102927;
  --muted: #50605b;
  --paper: #fbfaf5;
  --panel: #ffffff;
  --teal: #0a6868;
  --deep-teal: #063f42;
  --coral: #bf5b45;
  --gold: #c79a3a;
  --line: #d8ddd6;
  --shadow: 0 20px 60px rgba(16, 41, 39, 0.12);
  --heading: #061f1e;
  --hero-text: #243a37;
  --header-bg: rgba(251, 250, 245, 0.92);
  --button-primary-bg: #102927;
  --button-primary-text: #ffffff;
  --button-secondary-bg: rgba(255, 255, 255, 0.55);
  --button-secondary-text: #102927;
  --hero-gradient: linear-gradient(90deg, rgba(251, 250, 245, 1) 0%, rgba(251, 250, 245, 0.99) 46%, rgba(251, 250, 245, 0.76) 62%, rgba(251, 250, 245, 0.08) 100%);
  color-scheme: light;
}

html[data-theme="dark"] {
  --ink: #eaf3ef;
  --muted: #b4c4be;
  --paper: #071311;
  --panel: #10201d;
  --teal: #6bd2c9;
  --deep-teal: #0c2b28;
  --coral: #ff9d80;
  --gold: #e7be64;
  --line: rgba(233, 244, 238, 0.16);
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.38);
  --heading: #f5fbf7;
  --hero-text: #d5e4df;
  --header-bg: rgba(7, 19, 17, 0.9);
  --button-primary-bg: #f5fbf7;
  --button-primary-text: #071311;
  --button-secondary-bg: rgba(255, 255, 255, 0.08);
  --button-secondary-text: #f5fbf7;
  --hero-gradient: linear-gradient(90deg, rgba(7, 19, 17, 0.98) 0%, rgba(7, 19, 17, 0.92) 47%, rgba(7, 19, 17, 0.6) 68%, rgba(7, 19, 17, 0.18) 100%);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
}

body::before {
  background:
    linear-gradient(color-mix(in srgb, var(--ink) 5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ink) 5%, transparent) 1px, transparent 1px);
  background-size: 42px 42px;
  content: "";
  inset: 0;
  pointer-events: none;
  position: fixed;
  z-index: -1;
}

a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 20;
  background: var(--ink);
  color: #fff;
  padding: 0.75rem 1rem;
}

.skip-link:focus {
  top: 1rem;
}

.icon-sprite {
  display: none;
}

.scroll-progress {
  background: linear-gradient(90deg, var(--teal), var(--coral), var(--gold));
  height: 4px;
  left: 0;
  position: fixed;
  top: 0;
  transform: scaleX(0);
  transform-origin: left;
  width: 100%;
  z-index: 30;
}

svg {
  display: inline-block;
  fill: none;
  flex: 0 0 auto;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.site-header {
  align-items: center;
  background: var(--header-bg);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(16, 41, 39, 0.1);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  left: 0;
  min-height: 72px;
  padding: 0.8rem clamp(1rem, 4vw, 3.5rem);
  position: fixed;
  right: 0;
  top: 0;
  z-index: 10;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: inline-flex;
  gap: 0.8rem;
  min-width: 220px;
  text-decoration: none;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.brand-mark {
  align-items: center;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--deep-teal), var(--teal));
  border-radius: 8px;
  color: #fff;
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  width: 42px;
}

.nav-links {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.25rem 0;
  position: relative;
  text-decoration: none;
}

.nav-links a::after {
  background: var(--coral);
  bottom: -0.25rem;
  content: "";
  height: 2px;
  left: 0;
  position: absolute;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
  width: 100%;
}

.nav-links a.is-active::after,
.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-links a:hover {
  color: var(--teal);
}

.theme-toggle {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  gap: 0.45rem;
  min-height: 42px;
  padding: 0.55rem 0.75rem;
  transition: border-color 180ms ease, box-shadow 180ms ease, color 180ms ease, transform 180ms ease;
}

.theme-toggle:hover {
  border-color: var(--coral);
  box-shadow: 0 10px 30px rgba(16, 41, 39, 0.1);
  color: var(--coral);
  transform: translateY(-1px);
}

.theme-icon {
  height: 18px;
  width: 18px;
}

html[data-theme="dark"] .theme-icon-moon,
html[data-theme="light"] .theme-icon-sun {
  display: none;
}

.hero {
  align-items: center;
  background-image: var(--hero-gradient), url("assets/hero-research.png");
  background-position: 68% center;
  background-size: cover;
  display: flex;
  min-height: 86vh;
  overflow: hidden;
  padding: 8rem clamp(1.25rem, 6vw, 5rem) 4rem;
  position: relative;
}

.hero::after {
  background:
    linear-gradient(90deg, rgba(10, 104, 104, 0.1), transparent 34%),
    repeating-linear-gradient(90deg, rgba(16, 41, 39, 0.05) 0, rgba(16, 41, 39, 0.05) 1px, transparent 1px, transparent 28px);
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.eyebrow,
.status {
  color: var(--coral);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 0.8rem;
  text-transform: uppercase;
}

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

h1 {
  color: var(--heading);
  font-size: clamp(3rem, 8vw, 6.4rem);
  letter-spacing: 0;
  line-height: 0.94;
  margin-bottom: 1.4rem;
  max-width: 780px;
  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.7);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: 0;
  line-height: 1.05;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.15rem;
  line-height: 1.25;
  margin-bottom: 0.65rem;
}

.hero-lede {
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  border: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  border-radius: 8px;
  box-shadow: 0 14px 42px rgba(16, 41, 39, 0.08);
  color: var(--heading);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  max-width: 710px;
  padding: 1rem 1.1rem;
}

html[data-theme="dark"] .hero-lede {
  background: rgba(7, 19, 17, 0.72);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.28);
  color: var(--heading);
}

.hero-socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.35rem 0 0;
}

.icon-button {
  align-items: center;
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  border: 1px solid rgba(16, 41, 39, 0.16);
  border-radius: 8px;
  color: var(--ink);
  display: inline-flex;
  height: 44px;
  justify-content: center;
  text-decoration: none;
  transition: border-color 180ms ease, color 180ms ease, transform 180ms ease, background 180ms ease;
  width: 44px;
}

.icon-button svg {
  height: 22px;
  width: 22px;
}

.icon-button:hover {
  background: #fff;
  border-color: var(--coral);
  color: var(--coral);
  transform: translateY(-2px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  align-items: center;
  border: 1px solid var(--ink);
  border-radius: 8px;
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  min-height: 46px;
  padding: 0.75rem 1rem;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button svg {
  height: 18px;
  margin-left: 0.45rem;
  width: 18px;
}

.button.primary {
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
}

.button.secondary {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-text);
}

.button:hover {
  transform: translateY(-2px);
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.35rem;
}

.research-tags span {
  background: rgba(10, 104, 104, 0.09);
  border: 1px solid rgba(10, 104, 104, 0.16);
  border-radius: 999px;
  color: var(--deep-teal);
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.4rem 0.7rem;
}

html[data-theme="dark"] .research-tags span {
  background: rgba(107, 210, 201, 0.12);
  border-color: rgba(107, 210, 201, 0.22);
  color: var(--teal);
}

.section {
  padding: clamp(4rem, 8vw, 7rem) clamp(1.25rem, 6vw, 5rem);
}

.section-heading {
  max-width: 900px;
}

.intro-section {
  display: grid;
  gap: clamp(2rem, 5vw, 5rem);
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1fr);
}

.intro-copy {
  color: var(--muted);
  font-size: 1.06rem;
}

.pillars {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding-top: 0;
}

.pillar,
.project-card,
.publication-list article,
.timeline article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(16, 41, 39, 0.04);
}

.pillar {
  min-height: 260px;
  overflow: hidden;
  padding: 1.4rem;
  position: relative;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.pillar::after {
  background: var(--teal);
  bottom: 0;
  content: "";
  height: 4px;
  left: 0;
  position: absolute;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
  width: 100%;
}

.pillar:hover,
.project-card:hover {
  border-color: rgba(10, 104, 104, 0.38);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.pillar:hover::after {
  transform: scaleX(1);
}

.card-icon {
  color: var(--teal);
  height: 30px;
  margin-bottom: 1.5rem;
  width: 30px;
}

.pillar-index {
  color: var(--gold);
  display: block;
  font-weight: 800;
  margin-bottom: 1rem;
}

.pillar p,
.project-card p,
.publication-list p,
.timeline p {
  color: var(--muted);
}

.project-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  min-height: 250px;
  overflow: hidden;
  padding: 1.4rem;
  position: relative;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.project-card::before {
  background: linear-gradient(90deg, var(--teal), var(--coral));
  content: "";
  height: 4px;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

.project-icon {
  background: color-mix(in srgb, var(--teal) 12%, var(--panel));
  border: 1px solid rgba(10, 104, 104, 0.14);
  border-radius: 8px;
  color: var(--teal);
  height: 42px;
  margin-bottom: 1.2rem;
  padding: 0.6rem;
  width: 42px;
}

.project-card a {
  font-weight: 700;
  margin-top: auto;
}

.inline-link {
  align-items: center;
  display: inline-flex;
  gap: 0.35rem;
  text-decoration: none;
}

.inline-link svg {
  height: 16px;
  width: 16px;
}

.repo-showcase {
  border-top: 1px solid var(--line);
  margin-top: clamp(2rem, 5vw, 4rem);
  padding-top: clamp(2rem, 4vw, 3rem);
}

.repo-heading {
  align-items: end;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.repo-heading h3 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin: 0;
}

.repo-grid,
.service-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.repo-card {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  display: flex;
  gap: 0.9rem;
  min-height: 96px;
  padding: 1rem;
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.repo-card svg {
  background: color-mix(in srgb, var(--teal) 12%, var(--panel));
  border: 1px solid rgba(10, 104, 104, 0.14);
  border-radius: 8px;
  color: var(--teal);
  height: 42px;
  padding: 0.55rem;
  width: 42px;
}

.repo-card strong,
.repo-card small {
  display: block;
}

.repo-card small {
  color: var(--muted);
  font-weight: 500;
}

.repo-card:hover {
  border-color: rgba(10, 104, 104, 0.34);
  box-shadow: 0 12px 35px rgba(16, 41, 39, 0.08);
  color: var(--ink);
  transform: translateY(-2px);
}

.publication-section {
  background: color-mix(in srgb, var(--teal) 8%, var(--paper));
}

.publication-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 2rem;
}

.publication-list article {
  align-items: center;
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) minmax(170px, 0.32fr);
  padding: 1rem 1.2rem;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.publication-list article:hover {
  border-color: rgba(191, 91, 69, 0.32);
  box-shadow: 0 12px 35px rgba(16, 41, 39, 0.08);
  transform: translateX(4px);
}

.publication-list h3 {
  font-size: 1rem;
  margin: 0;
}

.publication-list h3 a {
  color: var(--ink);
  text-decoration: none;
}

.publication-list h3 a:hover {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.publication-list p {
  margin: 0;
  justify-self: end;
  text-align: right;
}

.experience-section {
  background: var(--paper);
}

.timeline {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.timeline article {
  display: grid;
  gap: 1rem;
  grid-template-columns: 160px minmax(0, 0.8fr) minmax(0, 1fr);
  padding: 1.2rem;
  position: relative;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.timeline article::before {
  background: var(--gold);
  border-radius: 999px;
  content: "";
  height: 10px;
  left: -5px;
  position: absolute;
  top: 1.55rem;
  width: 10px;
}

.timeline article:hover {
  border-color: rgba(199, 154, 58, 0.38);
  box-shadow: 0 12px 35px rgba(16, 41, 39, 0.08);
}

.timeline span {
  color: var(--coral);
  font-weight: 800;
}

.timeline h3,
.timeline p {
  margin-bottom: 0;
}

.service-section {
  background: color-mix(in srgb, var(--gold) 12%, var(--paper));
}

.independent-section {
  background: color-mix(in srgb, var(--coral) 8%, var(--paper));
}

.independent-panel {
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 1rem;
  grid-template-columns: auto minmax(0, 1fr);
  margin-top: 2rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.independent-panel:hover {
  border-color: rgba(191, 91, 69, 0.34);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.independent-panel p:last-child {
  color: var(--muted);
  margin-bottom: 0;
}

.service-grid {
  margin-top: 2rem;
}

.service-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.4rem;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.service-card:hover {
  border-color: rgba(10, 104, 104, 0.34);
  box-shadow: 0 12px 35px rgba(16, 41, 39, 0.08);
  transform: translateY(-3px);
}

.service-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.service-card h3 a:hover {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.service-card p:last-child {
  color: var(--muted);
  margin-bottom: 0;
}

.contact-section {
  align-items: center;
  background: color-mix(in srgb, var(--coral) 10%, var(--paper));
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.65fr);
}

.contact-links {
  display: grid;
  gap: 0.8rem;
}

.contact-links a {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  display: flex;
  font-weight: 700;
  gap: 0.8rem;
  padding: 1rem;
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, color 180ms ease, transform 180ms ease;
}

.contact-links svg {
  color: var(--teal);
  height: 24px;
  width: 24px;
}

.contact-links a:hover {
  border-color: var(--coral);
  box-shadow: 0 12px 35px rgba(16, 41, 39, 0.08);
  color: var(--coral);
  transform: translateX(4px);
}

.contact-links a:hover svg {
  color: var(--coral);
}

.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.75);
  padding: 1.3rem clamp(1.25rem, 6vw, 5rem);
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
    position: static;
  }

  .hero {
    min-height: 76vh;
    padding-top: 4rem;
  }

  .intro-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .pillars,
  .project-grid,
  .repo-grid,
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .publication-list article,
  .timeline article {
    grid-template-columns: 1fr;
  }

  .publication-list p {
    justify-self: start;
    text-align: left;
  }
}

@media (max-width: 640px) {
  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    background-image: var(--hero-gradient), url("assets/hero-research.png");
    min-height: auto;
    padding-bottom: 3rem;
  }

  h1 {
    font-size: clamp(2.8rem, 16vw, 4.2rem);
  }

  .pillars,
  .project-grid,
  .repo-grid,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .independent-panel {
    grid-template-columns: 1fr;
  }

  .publication-list article:hover,
  .repo-card:hover,
  .service-card:hover,
  .contact-links a:hover {
    transform: none;
  }
}

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

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

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}