:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f6f6f4;
  --text: #18181b;
  --muted: #65656b;
  --line: rgba(24, 24, 27, 0.14);
  --button-bg: #18181b;
  --button-text: #ffffff;
  --header-bg: rgba(255, 255, 255, 0.76);
  --focus: #2563eb;
}

html.dark {
  color-scheme: dark;
  --bg: #09090b;
  --surface: #111114;
  --text: #f4f4f5;
  --muted: #a1a1aa;
  --line: rgba(244, 244, 245, 0.16);
  --button-bg: #f4f4f5;
  --button-text: #09090b;
  --header-bg: rgba(9, 9, 11, 0.76);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 220ms ease, color 220ms ease;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  transform: translateY(-180%);
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 68px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.brand {
  justify-self: start;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: clamp(1rem, 2.5vw, 2rem);
  font-size: 0.84rem;
}

.nav a,
.site-footer a {
  text-underline-offset: 0.35em;
  text-decoration-thickness: 1px;
  text-decoration-color: transparent;
  transition: text-decoration-color 160ms ease;
}

.nav a:hover,
.site-footer a:hover {
  text-decoration-color: currentColor;
}

.theme-toggle {
  justify-self: end;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.5rem 0.8rem;
  background: color-mix(in srgb, var(--bg) 65%, transparent);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 7rem 6vw 5rem;
  isolation: isolate;
}

.rays {
  --stripes-light: repeating-linear-gradient(100deg, #fff 0%, #fff 7%, transparent 10%, transparent 12%, #fff 16%);
  --stripes-dark: repeating-linear-gradient(100deg, #000 0%, #000 7%, transparent 10%, transparent 12%, #000 16%);
  --rainbow: repeating-linear-gradient(100deg, #60a5fa 10%, #e879f9 15%, #60a5fa 20%, #5eead4 25%, #60a5fa 30%);
  position: absolute;
  inset: -10px;
  z-index: -1;
  opacity: 0.5;
  background-image: var(--stripes-light), var(--rainbow);
  background-size: 300%, 200%;
  background-position: 50% 50%;
  filter: blur(10px) invert(100%);
  -webkit-mask-image: radial-gradient(ellipse at 100% 0%, #000 40%, transparent 70%);
  mask-image: radial-gradient(ellipse at 100% 0%, #000 40%, transparent 70%);
  pointer-events: none;
}

.rays::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--stripes-light), var(--rainbow);
  background-size: 200%, 100%;
  background-attachment: fixed;
  mix-blend-mode: difference;
  animation: jumbo 60s linear infinite;
}

.dark .rays {
  background-image: var(--stripes-dark), var(--rainbow);
  filter: blur(10px) opacity(50%) saturate(200%);
}

.dark .rays::after {
  background-image: var(--stripes-dark), var(--rainbow);
}

@keyframes jumbo {
  from { background-position: 50% 50%; }
  to { background-position: 350% 50%; }
}

.hero-inner {
  width: min(960px, 100%);
  text-align: center;
}

.eyebrow {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: clamp(0.78rem, 1.3vw, 0.95rem);
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1,
h2,
p {
  text-wrap: pretty;
}

h1 {
  margin: 0;
  font-size: clamp(4.5rem, 17vw, 13rem);
  line-height: 0.82;
  letter-spacing: -0.065em;
  text-transform: uppercase;
}

.hero-copy {
  width: min(660px, 100%);
  margin: 2rem auto 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.25rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
}

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

.button-secondary {
  background: color-mix(in srgb, var(--bg) 55%, transparent);
}

.scroll-cue {
  position: absolute;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.content-section {
  padding: clamp(5rem, 10vw, 9rem) 6vw;
  border-top: 1px solid var(--line);
}

.content-section-alt {
  background: var(--surface);
}

.section-heading,
.intro-grid {
  width: min(1200px, 100%);
  margin-inline: auto;
}

.section-heading {
  display: grid;
  grid-template-columns: 5rem 1fr;
  align-items: baseline;
  gap: 1rem;
}

.section-number {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}

h2 {
  margin: 0;
  font-size: clamp(2.8rem, 7vw, 7rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(240px, 0.6fr);
  gap: clamp(2rem, 8vw, 8rem);
  margin-top: clamp(2rem, 6vw, 5rem);
  padding-left: 6rem;
}

.lead {
  max-width: 760px;
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2.7rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.discipline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.discipline-list li {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
}

.discipline-list span {
  min-width: 2rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.microcopy {
  align-self: end;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 6vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.site-footer p {
  margin: 0;
}

.noscript {
  margin: 0;
  padding: 1rem 6vw;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 720px) {
  .site-header {
    grid-template-columns: 1fr auto;
    min-height: 62px;
  }

  .nav {
    display: none;
  }

  h1 {
    font-size: clamp(4rem, 24vw, 7rem);
  }

  .hero-copy {
    max-width: 33rem;
  }

  .section-heading {
    grid-template-columns: 2.5rem 1fr;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    padding-left: 3.5rem;
  }

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

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

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