:root {
  color-scheme: light dark;
  --background: #fffaf7;
  --surface: #ffffff;
  --text: #352e2b;
  --muted: #6f625d;
  --border: #eaded8;
  --primary: #d9796b;
  --primary-dark: #985044;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-size: 16px;
  line-height: 1.75;
}

a {
  color: var(--primary-dark);
  text-underline-offset: 0.2em;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  padding: 0.75rem 1rem;
  color: #ffffff;
  background: var(--primary-dark);
  border-radius: 0.5rem;
  z-index: 10;
}

.skip-link:focus {
  top: 1rem;
}

header,
main,
footer {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

header {
  padding-block: 2.5rem 1.25rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1rem;
}

main {
  padding-bottom: 3rem;
}

footer {
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 6vw, 2.65rem);
}

h2 {
  margin-top: 2.5rem;
  padding-top: 0.25rem;
  font-size: 1.4rem;
}

h3 {
  margin-top: 1.75rem;
  font-size: 1.1rem;
}

p,
ul,
ol,
dl {
  margin-block: 0.85rem;
}

li + li {
  margin-top: 0.45rem;
}

.tagline,
.lede {
  color: var(--muted);
  font-size: 1.08rem;
}

.card {
  margin-block: 1.5rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
}

.link-list {
  display: grid;
  gap: 0.85rem;
  padding: 0;
  list-style: none;
}

.link-list a {
  display: block;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--surface);
  font-weight: 700;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  white-space: nowrap;
}

dt {
  margin-top: 1rem;
  font-weight: 700;
}

dd {
  margin-left: 0;
}

.operator dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1rem;
  margin: 0;
}

.operator dt {
  margin: 0;
}

.operator p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #191615;
    --surface: #25201e;
    --text: #f4ebe7;
    --muted: #c7b8b1;
    --border: #554842;
    --primary: #e58b7d;
    --primary-dark: #f1a99e;
  }
}

@media (max-width: 520px) {
  .operator dl {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .operator dd + dt {
    margin-top: 0.75rem;
  }
}

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