:root {
  color-scheme: light;
  --bg: #f7f4ef;
  --surface: #ffffff;
  --surface-2: #eee9e0;
  --text: #181716;
  --muted: #68615a;
  --border: #ded7cc;
  --accent: #ef4631;
  --accent-ink: #ffffff;
  --green: #1f7a4d;
  --blue: #2563a7;
  --shadow: 0 18px 50px rgba(40, 33, 26, 0.08);
  --max: 1120px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --radius: 8px;
  --font: "Aptos", "Segoe UI", system-ui, sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #080b0d;
  --surface: #111518;
  --surface-2: #1a2024;
  --text: #f4f1eb;
  --muted: #ada69f;
  --border: #2b3338;
  --accent: #ff523d;
  --accent-ink: #160503;
  --green: #52b77c;
  --blue: #69a7df;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
}

body.nav-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--accent), transparent 35%);
  text-underline-offset: 0.22em;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent), white 18%);
  outline-offset: 3px;
}

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

.skip-link:focus {
  top: 1rem;
  left: 1rem;
  z-index: 20;
  width: auto;
  height: auto;
  padding: 0.6rem 0.8rem;
  clip: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--border), transparent 35%);
  background: color-mix(in srgb, var(--bg), transparent 5%);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--max));
  min-height: 68px;
  margin: 0 auto;
  gap: var(--space-3);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: var(--space-2);
  font-weight: 760;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.78rem;
  font-weight: 800;
}

.nav-links {
  gap: var(--space-1);
}

.nav-links a,
.theme-toggle,
.filter,
.button {
  min-height: 40px;
  border-radius: var(--radius);
  font: inherit;
}

.nav-links a,
.theme-toggle {
  padding: 0.48rem 0.7rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
}

.nav-links a.active,
.nav-links a:hover,
.theme-toggle:hover {
  color: var(--text);
  background: var(--surface-2);
}

.theme-toggle,
.nav-toggle,
.filter {
  cursor: pointer;
  background: none;
  color: var(--text);
  border: 1px solid var(--border);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  place-items: center;
  gap: 4px;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
}

.section {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: var(--space-6) 0;
}

.hero {
  min-height: calc(100svh - 68px);
  display: grid;
  align-items: center;
  padding-top: var(--space-5);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  align-items: center;
  gap: var(--space-6);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 780;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  max-width: 12ch;
  margin-bottom: var(--space-4);
  font-size: 6rem;
}

h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 3.6rem;
}

h3 {
  margin-bottom: var(--space-2);
  font-size: 1.15rem;
}

.hero-text {
  max-width: 680px;
  color: var(--muted);
  font-size: 1.22rem;
}

.hero-actions,
.contact-actions,
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  font-weight: 720;
  text-decoration: none;
  border: 1px solid var(--border);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover,
.project-card:hover,
.publication:hover {
  transform: translateY(-2px);
}

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

.button.secondary {
  background: var(--surface);
}

.profile-panel,
.project-card,
.publication,
.proof,
.contact {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.profile-panel {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
}

.avatar-wrap {
  width: 180px;
  height: 180px;
  padding: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.avatar {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface-2);
  border: 10px solid var(--surface);
}

.profile-name {
  margin-bottom: 0.1rem;
  font-size: 1.45rem;
  font-weight: 800;
}

.profile-role {
  margin-bottom: 0;
  color: var(--muted);
}

.profile-facts {
  display: grid;
  gap: var(--space-3);
  margin: 0;
}

.profile-facts div {
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

dt {
  color: var(--muted);
  font-size: 0.82rem;
}

dd {
  margin: 0;
  font-weight: 700;
}

.proof {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  padding: 0;
  overflow: hidden;
  background: var(--border);
}

.proof-item {
  display: grid;
  gap: 0.1rem;
  padding: var(--space-4);
  background: var(--surface);
}

.proof-value {
  font-size: 1.35rem;
  font-weight: 850;
}

.proof-label {
  color: var(--muted);
  font-size: 0.92rem;
}

.section-heading {
  margin-bottom: var(--space-5);
}

.filters {
  margin-bottom: var(--space-4);
}

.filter {
  padding: 0.55rem 0.85rem;
  color: var(--muted);
}

.filter.active,
.filter:hover {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.project-card {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  padding: var(--space-4);
  transition: transform 180ms ease, border-color 180ms ease;
}

.project-card.is-hidden {
  display: none;
}

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

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.card-top a,
.text-link {
  color: var(--accent);
  font-weight: 740;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 730;
}

.stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0;
  margin: auto 0 0;
  list-style: none;
}

.stack-list li {
  color: var(--muted);
  font-size: 0.86rem;
}

.stack-list li::before {
  content: "";
  display: inline-block;
  width: 0.48rem;
  height: 0.48rem;
  margin-right: 0.35rem;
  border-radius: 50%;
  background: var(--green);
}

.stack-list li:nth-child(2)::before {
  background: var(--blue);
}

.stack-list li:nth-child(3)::before {
  background: var(--accent);
}

.split-section {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-5);
  align-items: start;
}

.publication {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  transition: transform 180ms ease;
}

.timeline {
  display: grid;
  gap: var(--space-3);
}

.timeline-item {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}

.timeline-date {
  color: var(--accent);
  font-weight: 820;
}

.contact {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
}

.contact h2 {
  max-width: 720px;
  font-size: 2.8rem;
}

.contact-actions {
  justify-content: flex-end;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: var(--space-5) 0;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

@media (max-width: 900px) {
  .hero-grid,
  .split-section,
  .contact {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 13ch;
    font-size: 4.6rem;
  }

  h2 {
    font-size: 3rem;
  }

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

  .contact-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    inset: 68px 1rem auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

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

  .section {
    width: min(100% - 1.25rem, var(--max));
    padding: var(--space-5) 0;
  }

  .hero {
    min-height: auto;
    padding-top: var(--space-5);
  }

  .hero-grid {
    gap: var(--space-4);
  }

  h1 {
    max-width: 100%;
    font-size: 3rem;
  }

  h2 {
    font-size: 2rem;
  }

  .profile-panel,
  .project-card,
  .publication,
  .contact {
    padding: var(--space-3);
  }

  .project-grid,
  .proof {
    grid-template-columns: 1fr;
  }

  .proof-item {
    padding: var(--space-3);
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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