@font-face {
  font-family: 'Atkinson NavOSS';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/AtkinsonHyperlegibleNext-Regular.ttf') format('truetype');
}

@font-face {
  font-family: 'Atkinson NavOSS';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/AtkinsonHyperlegibleNext-Bold.ttf') format('truetype');
}

:root {
  --asphalt: #1b2526;
  --asphalt-soft: #243536;
  --border: #cbd3ce;
  --coral: #e65342;
  --fog: #e9eeea;
  --green: #18796f;
  --muted: #596463;
  --paper: #f7f7f2;
  --sky: #d8ecea;
  --sun: #f5c84c;
  --white: #ffffff;
  --content: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--asphalt);
  font-family: 'Atkinson NavOSS', sans-serif;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  align-items: center;
  background: var(--asphalt);
  color: var(--white);
  display: flex;
  gap: 28px;
  min-height: 68px;
  padding: 10px max(22px, calc((100% - var(--content)) / 2));
  position: relative;
  z-index: 10;
}

.brand {
  align-items: center;
  display: inline-flex;
  font-size: 21px;
  font-weight: 700;
  gap: 10px;
  text-decoration: none;
}

.brand img {
  height: 36px;
  width: 36px;
}

.site-nav {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-left: auto;
}

.site-nav a {
  color: #dce3df;
  font-size: 15px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--sun);
}

.source-link {
  border: 1px solid #607170;
  border-radius: 6px;
  padding: 9px 13px;
}

.hero {
  background-color: var(--asphalt);
  background-image: url('/assets/app-navigation.jpg');
  background-position: center 43%;
  background-size: cover;
  color: var(--white);
  display: grid;
  height: min(82svh, 820px);
  min-height: 610px;
  overflow: hidden;
  position: relative;
}

.hero::after {
  background: rgba(18, 30, 31, 0.72);
  content: '';
  inset: 0;
  position: absolute;
}

.hero__content {
  align-self: end;
  margin: 0 auto;
  max-width: var(--content);
  padding: 60px 22px 72px;
  position: relative;
  width: 100%;
  z-index: 1;
}

.eyebrow {
  color: var(--sun);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 14px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 76px;
  letter-spacing: 0;
  line-height: 0.98;
  margin: 0;
}

.hero__lead {
  color: #edf2ef;
  font-size: 25px;
  line-height: 1.35;
  margin: 22px 0 0;
  max-width: 620px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  align-items: center;
  border-radius: 6px;
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  text-decoration: none;
}

.button--primary {
  background: var(--sun);
  color: var(--asphalt);
}

.button--secondary {
  border: 1px solid #81918f;
  color: var(--white);
}

.hero__status {
  border-top: 1px solid rgba(255, 255, 255, 0.24);
  color: #d6dfdb;
  font-size: 15px;
  margin-top: 38px;
  max-width: 720px;
  padding-top: 18px;
}

.section {
  padding: 78px 22px;
}

.section__inner {
  margin: 0 auto;
  max-width: var(--content);
}

.section h2,
.document h1 {
  font-size: 42px;
  letter-spacing: 0;
  line-height: 1.08;
  margin: 0;
}

.section__intro {
  color: var(--muted);
  font-size: 20px;
  line-height: 1.5;
  margin: 18px 0 0;
  max-width: 680px;
}

.principles {
  border-bottom: 1px solid var(--border);
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 46px;
}

.principle {
  min-height: 210px;
  padding: 30px;
}

.principle + .principle {
  border-left: 1px solid var(--border);
}

.principle__number {
  color: var(--green);
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 28px;
}

.principle h3 {
  font-size: 24px;
  letter-spacing: 0;
  margin: 0 0 12px;
}

.principle p {
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}

.evidence-band {
  background: var(--sky);
  border-bottom: 1px solid #b9d4d0;
  border-top: 1px solid #b9d4d0;
}

.metrics {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 42px;
}

.metric {
  border-left: 1px solid #a7c8c3;
  padding: 8px 24px 8px 26px;
}

.metric:first-child {
  border-left: 0;
  padding-left: 0;
}

.metric strong {
  display: block;
  font-size: 36px;
  letter-spacing: 0;
}

.metric span {
  color: #405957;
  display: block;
  line-height: 1.35;
  margin-top: 8px;
}

.status-list {
  border-top: 1px solid var(--border);
  margin: 42px 0 0;
}

.status-row {
  align-items: start;
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 24px;
  grid-template-columns: 180px 1fr;
  padding: 22px 0;
}

.status-row dt {
  font-weight: 700;
}

.status-row dd {
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

.notice-band {
  background: var(--sun);
  color: var(--asphalt);
}

.notice-band .section__inner {
  align-items: center;
  display: grid;
  gap: 34px;
  grid-template-columns: 1fr auto;
}

.notice-band p {
  font-size: 19px;
  line-height: 1.5;
  margin: 10px 0 0;
  max-width: 720px;
}

.site-footer {
  background: var(--asphalt);
  color: #d9e0dd;
  padding: 48px 22px;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin: 0 auto;
  max-width: var(--content);
}

.footer__inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-left: auto;
}

.footer__inner a {
  color: #d9e0dd;
}

.document-shell {
  background: var(--fog);
  min-height: calc(100svh - 68px);
  padding: 68px 22px 96px;
}

.document {
  background: var(--white);
  border-left: 6px solid var(--green);
  margin: 0 auto;
  max-width: 920px;
  padding: 58px 64px 70px;
}

.document__meta {
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 16px;
  text-transform: uppercase;
}

.document h2 {
  border-top: 1px solid var(--border);
  font-size: 25px;
  letter-spacing: 0;
  margin: 42px 0 14px;
  padding-top: 28px;
}

.document h3 {
  font-size: 19px;
  letter-spacing: 0;
  margin: 28px 0 10px;
}

.document p,
.document li {
  color: #344241;
  font-size: 17px;
  line-height: 1.65;
}

.document ul {
  padding-left: 24px;
}

.callout {
  background: var(--sky);
  border-left: 4px solid var(--green);
  margin: 28px 0;
  padding: 18px 20px;
}

.callout--warning {
  background: #fbe5df;
  border-left-color: var(--coral);
}

.reveal {
  animation: rise 560ms ease both;
}

.reveal--2 {
  animation-delay: 100ms;
}

.reveal--3 {
  animation-delay: 180ms;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    gap: 14px;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a:not(.source-link) {
    display: none;
  }

  .hero {
    background-position: center top;
    height: 78svh;
    min-height: 590px;
  }

  .hero__content {
    padding-bottom: 50px;
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero__lead {
    font-size: 21px;
  }

  .section {
    padding: 58px 20px;
  }

  .section h2,
  .document h1 {
    font-size: 34px;
  }

  .principles,
  .metrics {
    grid-template-columns: 1fr;
  }

  .principle + .principle,
  .metric {
    border-left: 0;
    border-top: 1px solid var(--border);
  }

  .metric,
  .metric:first-child {
    padding: 22px 0;
  }

  .status-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .notice-band .section__inner {
    grid-template-columns: 1fr;
  }

  .footer__inner nav {
    margin-left: 0;
    width: 100%;
  }

  .document-shell {
    padding: 24px 0 64px;
  }

  .document {
    border-left-width: 4px;
    padding: 42px 22px 56px;
  }
}

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

  .reveal {
    animation: none;
  }
}