:root {
  --bg: #F0F3F5;
  --surface: #FFFFFF;
  --text: #000000;
  --muted: #1C1C1E;
  --border: #C0C4C7;
  --accent: #2B8AD4;
  --accent-dark: #0A5590;
  --accent-soft: #ECF7FF;
  --accent-secondary: #99D2FF;
  --accent-tertiary: #ECF7FF;
  --shadow: 0 16px 40px rgba(11, 85, 144, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

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

.container {
  width: min(100% - 32px, 1080px);
  margin: 0 auto;
}

.narrow {
  max-width: 820px;
}

.site-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 18px 0;
}

.brand {
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: 0;
  text-decoration: none;
}

.site-nav,
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.site-nav {
  flex: 0 0 100%;
  margin-left: auto;
  order: 2;
  justify-content: flex-end;
}

@media (max-width: 719px) {
  .site-nav {
    margin-left: 0;
    justify-content: flex-start;
  }
}

.site-nav a,
.site-footer a {
  color: var(--muted);
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-footer a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent-dark);
}

.theme-toggle {
  display: inline-grid;
  flex: 0 0 auto;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  cursor: pointer;
  margin-left: auto;
  order: 1;
}

.theme-toggle:hover {
  color: var(--accent-dark);
}

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

.theme-icon {
  font-size: 1.25rem;
  line-height: 1;
}

.theme-icon-moon {
  display: none;
}

.theme-toggle[data-current-theme="dark"] .theme-icon-sun {
  display: none;
}

.theme-toggle[data-current-theme="dark"] .theme-icon-moon {
  display: inline;
}

.hero {
  padding: 56px 0 40px;
  background:
    linear-gradient(135deg, rgba(153, 210, 255, 0.42), rgba(255, 255, 255, 0) 52%),
    var(--bg);
}

.hero-inner {
  max-width: 920px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 750;
  text-transform: uppercase;
}

h1,
h2 {
  line-height: 1.2;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.3rem, 9vw, 4.8rem);
}

h2 {
  margin: 0 0 12px;
  font-size: 1.35rem;
}

p {
  margin: 0 0 16px;
}

.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.1rem;
}

.link-grid {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.link-card {
  display: block;
  min-height: 116px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  text-decoration: none;
}

.link-card span {
  display: block;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 750;
}

.link-card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.content-section,
.document {
  padding: 42px 0 56px;
}

.document h1 {
  font-size: clamp(2rem, 7vw, 3.5rem);
}

.document section {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.document section:first-of-type {
  margin-top: 28px;
}

ul {
  margin: 0 0 16px;
  padding-left: 22px;
}

li + li {
  margin-top: 8px;
}

.site-footer {
  background: #1C1C1E;
  color: #F0F3F5;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px 0;
}

.site-footer p {
  margin: 0;
  color: #D9DDE0;
}

.site-footer a {
  color: #ECF7FF;
}

.site-footer a:hover {
  color: #FFFFFF;
}

@media (min-width: 720px) {
  .header-inner {
    flex-wrap: nowrap;
  }

  .site-nav {
    flex: 0 1 auto;
    order: 0;
  }

  .theme-toggle {
    margin-left: 0;
    order: 0;
  }

  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .site-nav,
  .site-footer nav {
    justify-content: flex-end;
  }

  .hero {
    padding: 86px 0 62px;
  }

  .link-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .content-section,
  .document {
    padding: 58px 0 76px;
  }
}

:root[data-theme="dark"] {
  --bg: #1C1C1E;
  --surface: #2C2C2C;
  --text: #FFFFFF;
  --muted: #D9DDE0;
  --border: #414143;
  --accent: #43A7F6;
  --accent-dark: #99D2FF;
  --accent-soft: #002B4C;
  --accent-secondary: #0A5590;
  --accent-tertiary: #002B4C;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
}

:root[data-theme="dark"] .site-header {
  background: rgba(16, 21, 19, 0.94);
}

:root[data-theme="dark"] .hero {
  background:
    linear-gradient(135deg, rgba(94, 234, 212, 0.12), rgba(16, 21, 19, 0) 52%),
    var(--bg);
}

:root[data-theme="dark"] .site-footer {
  background: #070a09;
}

:root[data-theme="dark"] .site-footer p {
  color: #b8c5bd;
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #1C1C1E;
    --surface: #2C2C2C;
    --text: #FFFFFF;
    --muted: #D9DDE0;
    --border: #414143;
    --accent: #43A7F6;
    --accent-dark: #99D2FF;
    --accent-soft: #002B4C;
    --accent-secondary: #0A5590;
    --accent-tertiary: #002B4C;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  }

  :root:not([data-theme]) .site-header {
    background: rgba(16, 21, 19, 0.94);
  }

  :root:not([data-theme]) .hero {
    background:
      linear-gradient(135deg, rgba(94, 234, 212, 0.12), rgba(16, 21, 19, 0) 52%),
      var(--bg);
  }

  :root:not([data-theme]) .site-footer {
    background: #070a09;
  }

  :root:not([data-theme]) .site-footer p {
    color: #b8c5bd;
  }
}