:root {
  --bl: #1e40af;
  --bl-d: #1e3a8a;
  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;
  --bg: #ffffff;
  --bdr: #e5e7eb;
  --footer-bg: #0f172a;
  box-sizing: border-box;
}

* {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink-2);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  line-height: 1.7;
  font-size: 16px;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

a {
  color: var(--bl);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.header {
  border-bottom: 1px solid var(--bdr);
  position: sticky;
  top: 0;
  background: #fff;
  z-index: 20;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.brand-logo {
  display: block;
  width: 148px;
  height: auto;
}

.header-links {
  display: flex;
  gap: 16px;
  font-size: 13px;
  font-weight: 700;
}

.header-links a[aria-current="page"] {
  color: var(--ink);
  text-decoration: none;
  pointer-events: none;
}

.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 20px 0;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.4px;
  line-height: 1.2;
}

.hero .meta {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ink-3);
}

.hero .meta b {
  color: var(--ink-2);
  font-weight: 700;
}

article {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

article h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
  margin: 32px 0 12px;
  scroll-margin-top: 72px;
  line-height: 1.3;
}

article h2:first-child {
  margin-top: 0;
}

article h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin: 20px 0 8px;
}

article p {
  margin: 0 0 14px;
  max-width: 70ch;
}

article ul {
  margin: 0 0 14px;
  padding-left: 22px;
  max-width: 68ch;
}

article li {
  margin-bottom: 7px;
}

article .lead {
  margin-bottom: 14px;
}

footer {
  background: var(--footer-bg);
  color: #cbd5e1;
}

.footer-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px calc(28px + env(safe-area-inset-bottom, 0px));
  font-size: 13px;
  line-height: 1.6;
}

.footer-inner strong {
  color: #fff;
}

.footer-inner a {
  color: #e2e8f0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 12px;
}

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