:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #465469;
  --line: #d9e0ea;
  --surface: #ffffff;
  --soft: #f4f7fb;
  --accent: #1859c9;
  --accent-dark: #10418f;
  --focus: #ffbf47;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--soft); }

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-size: 17px;
  line-height: 1.65;
}

a { color: var(--accent); text-underline-offset: 0.17em; }
a:hover { color: var(--accent-dark); }
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  padding: .65rem .9rem;
  background: var(--ink);
  color: white;
  z-index: 10;
}
.skip-link:focus { top: 1rem; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
}

.header-inner,
main,
.footer-inner {
  width: min(100% - 2rem, 820px);
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  color: var(--ink);
  font-weight: 760;
  text-decoration: none;
  letter-spacing: -.02em;
}

nav { display: flex; flex-wrap: wrap; gap: .85rem; font-size: .94rem; }
nav a { color: var(--muted); font-weight: 650; text-decoration: none; }
nav a[aria-current="page"] {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: .3em;
}

main { padding-block: clamp(2.5rem, 7vw, 5.25rem); }

.eyebrow {
  margin: 0 0 .55rem;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .11em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -.025em; }
h1 { margin: 0 0 1rem; font-size: clamp(2.05rem, 7vw, 3.35rem); }
h2 { margin: 2.6rem 0 .75rem; font-size: clamp(1.35rem, 4vw, 1.75rem); }
h3 { margin: 1.75rem 0 .5rem; font-size: 1.12rem; }

.lede { max-width: 690px; color: var(--muted); font-size: 1.1rem; }
.updated { color: var(--muted); font-size: .9rem; }

.notice {
  margin: 1.6rem 0;
  padding: 1rem 1.15rem;
  border: 1px solid #b9cdf3;
  border-left: 5px solid var(--accent);
  border-radius: 8px;
  background: #eef4ff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  position: relative;
  padding-right: 2.7rem;
}
.card:hover { border-color: #aebbd0; box-shadow: 0 8px 24px rgba(24, 44, 78, .08); }
.card::after {
  content: "→";
  position: absolute;
  right: 1.15rem;
  top: 1.1rem;
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 750;
}
.card strong { display: block; margin-bottom: .35rem; font-size: 1.08rem; }
.card span { color: var(--muted); font-size: .94rem; }

section { scroll-margin-top: 1rem; }
ul, ol { padding-left: 1.35rem; }
li + li { margin-top: .4rem; }

.term-list {
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
}
.term-list li {
  margin: .65rem 0;
  padding: .8rem 1rem;
  border-left: 3px solid var(--line);
  background: var(--surface);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  padding-block: 1.5rem 2rem;
  color: var(--muted);
  font-size: .88rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: .85rem; }

code {
  padding: .12rem .35rem;
  border-radius: 4px;
  background: #e9eef6;
  font-size: .9em;
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .header-inner { align-items: flex-start; flex-direction: column; padding-block: .9rem; }
  nav { gap: .65rem 1rem; }
  main { padding-top: 2.3rem; }
}

@media print {
  .skip-link, nav { display: none; }
  body, html { background: white; }
  main { padding-block: 1rem; }
  .site-header, .site-footer { border-color: #bbb; }
  a { color: inherit; }
}