:root {
  color-scheme: light;
  --background: #f5f5f7;
  --surface: #ffffff;
  --surface-muted: #f0f3f8;
  --text: #1d1d1f;
  --secondary: #515154;
  --tertiary: #6e6e73;
  --line: #d2d2d7;
  --accent: #0066cc;
  --accent-hover: #004f9e;
  --danger: #b42318;
  --focus: #0071e3;
  --radius-large: 28px;
  --radius-medium: 16px;
  --shadow: 0 16px 48px rgb(0 0 0 / 8%);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  color: #ffffff;
  background: var(--text);
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgb(0 0 0 / 8%);
  background: rgb(245 245 247 / 88%);
  backdrop-filter: saturate(180%) blur(20px);
}

.nav-shell,
.footer-shell {
  display: flex;
  width: min(1080px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.brand-mark {
  display: inline-grid;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  color: #ffffff;
  background: linear-gradient(145deg, #0b63ce, #54a4ff);
  place-items: center;
  font-size: 16px;
  letter-spacing: 0;
  box-shadow: 0 6px 18px rgb(0 102 204 / 24%);
}

.site-header nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-header nav a,
.site-footer nav a {
  display: inline-flex;
  min-height: 44px;
  padding: 0 12px;
  align-items: center;
  border-radius: 10px;
  color: var(--secondary);
  font-size: 14px;
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a[aria-current='page'] {
  color: var(--text);
  background: rgb(0 0 0 / 5%);
}

.page-shell {
  width: min(900px, calc(100% - 40px));
  min-height: 68vh;
  margin: 0 auto;
  padding: 88px 0 112px;
}

.page-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--text);
  letter-spacing: -0.025em;
  line-height: 1.12;
}

h1 {
  max-width: 820px;
  margin-bottom: 22px;
  font-size: clamp(44px, 8vw, 72px);
  font-weight: 720;
}

h2 {
  margin: 64px 0 18px;
  font-size: clamp(28px, 5vw, 38px);
}

h3 {
  margin: 32px 0 10px;
  font-size: 22px;
}

.lede {
  max-width: 720px;
  margin: 0;
  color: var(--secondary);
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.35;
}

.notice {
  margin: 0 0 40px;
  padding: 22px 24px;
  border: 1px solid #b9d8fb;
  border-radius: var(--radius-medium);
  background: #eef7ff;
}

.notice strong,
.notice p {
  margin: 0;
}

.notice p {
  margin-top: 3px;
  color: var(--secondary);
}

.prose {
  padding: clamp(26px, 5vw, 64px);
  border: 1px solid rgb(0 0 0 / 6%);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.prose > :first-child {
  margin-top: 0;
}

.prose > :last-child {
  margin-bottom: 0;
}

.prose p,
.prose li {
  max-width: 74ch;
}

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

.prose ul,
.prose ol {
  padding-left: 1.35em;
}

.prose blockquote {
  margin: 32px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  color: var(--secondary);
  background: var(--surface-muted);
}

.prose blockquote p {
  margin: 0;
}

.prose table {
  width: 100%;
  margin: 28px 0;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  border-collapse: separate;
  overflow: hidden;
  font-size: 15px;
}

.prose th,
.prose td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--surface-muted);
  font-weight: 650;
}

.prose tr:last-child td {
  border-bottom: 0;
}

.prose hr {
  height: 1px;
  margin: 56px 0;
  border: 0;
  background: var(--line);
}

.prose code {
  padding: 0.12em 0.35em;
  border-radius: 6px;
  background: var(--surface-muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

.prose--legal h2 {
  font-size: clamp(26px, 4vw, 32px);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-shell {
  min-height: 160px;
  padding: 32px 0;
  align-items: flex-start;
}

.footer-shell p {
  margin: 4px 0 0;
  color: var(--tertiary);
  font-size: 14px;
}

@media (max-width: 720px) {
  .nav-shell {
    width: min(100% - 24px, 1080px);
    gap: 8px;
  }

  .site-header nav a {
    padding: 0 10px;
  }

  .page-shell {
    width: min(100% - 24px, 900px);
    padding: 56px 0 72px;
  }

  .page-heading {
    margin-bottom: 32px;
  }

  .prose {
    padding: 24px 20px;
    border-radius: 20px;
  }

  .prose table {
    display: block;
    overflow-x: auto;
  }

  .footer-shell {
    width: min(100% - 32px, 1080px);
    flex-direction: column;
  }

  .site-footer nav {
    flex-wrap: wrap;
  }
}

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