:root {
  color-scheme: light;
  --bg: #d8dcdd;
  --bg-elevated: #e4e8e9;
  --ink: #141816;
  --muted: #4d5652;
  --line: rgba(20, 24, 22, 0.14);
  --accent: #0f5c45;
  --accent-soft: rgba(15, 92, 69, 0.12);
  --page-x: clamp(1.25rem, 4vw, 4rem);
  --max: 1120px;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(1100px 420px at 78% -8%, rgba(15, 92, 69, 0.07), transparent 58%),
    var(--bg);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  padding: 0.65rem 0.9rem;
  background: var(--ink);
  color: #fff;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform 160ms var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 4rem;
  padding: 0 var(--page-x);
  border-bottom: 1px solid var(--line);
  background: rgba(216, 220, 221, 0.9);
  backdrop-filter: blur(10px);
}

.brand,
.footer-brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
  font-size: 0.95rem;
}

.nav a,
.nav-cta,
.footer-links a {
  text-decoration: none;
}

.nav a:hover,
.nav-cta:hover,
.footer-links a:hover {
  text-decoration: underline;
}

.nav-cta {
  font-size: 0.95rem;
  font-weight: 600;
}

.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: min(100vh, 52rem);
  padding: clamp(5rem, 12vh, 8rem) var(--page-x) clamp(3rem, 8vh, 5rem);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(216, 220, 221, 0.97) 0%,
    rgba(216, 220, 221, 0.9) 36%,
    rgba(216, 220, 221, 0.35) 66%,
    rgba(216, 220, 221, 0.1) 100%
  );
  pointer-events: none;
}

.hero-plane {
  position: absolute;
  inset: 0;
  color: rgba(20, 24, 22, 0.55);
  pointer-events: none;
}

.hero-diagram {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: right center;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 40rem;
}

.brand-lockup {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.35rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.lede,
.section-intro > p,
.section-close > p,
.capability-list dd,
.path-list p,
.principle-list p,
.site-footer p {
  color: var(--muted);
}

.lede {
  margin: 0 0 1.75rem;
  max-width: 38ch;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.button:hover {
  text-decoration: none;
}

.button-primary {
  background: var(--ink);
  color: #fff;
}

.button-primary:hover {
  background: var(--accent);
  color: #fff;
}

.button-secondary {
  border-color: var(--line);
  background: transparent;
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  width: min(100% - (var(--page-x) * 2), var(--max));
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-intro {
  max-width: 40rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-intro h2,
.section-close h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section-intro p,
.section-close p {
  margin: 0;
  max-width: 52ch;
}

.capability-list,
.principle-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.capability-list div,
.principle-list li {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.capability-list dt,
.principle-list h3,
.path-list h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.capability-list dd,
.principle-list p,
.path-list p {
  margin: 0;
  font-size: 0.98rem;
}

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

.path-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.step {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.section-close {
  text-align: left;
}

.section-close .button {
  margin-top: 1.5rem;
}

.site-footer {
  display: grid;
  gap: 0.65rem;
  padding: 2rem var(--page-x) 2.75rem;
  border-top: 1px solid var(--line);
  background: var(--bg-elevated);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.95rem;
}

@media (max-width: 800px) {
  .site-header {
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    padding-top: 0.85rem;
    padding-bottom: 0.85rem;
  }

  .nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
  }

  .nav-cta {
    margin-left: auto;
  }

  .hero {
    min-height: auto;
    align-items: start;
    padding-top: 6rem;
  }

  .hero-plane {
    opacity: 0.55;
  }

  .capability-list,
  .principle-list {
    grid-template-columns: 1fr;
  }

  .path-list li {
    grid-template-columns: 3.25rem 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}