:root {
  color-scheme: light;
  --ink: #231f20;
  --muted: #655e60;
  --line: #eadfda;
  --surface: #fffaf7;
  --brand: #b63a2b;
  --brand-dark: #81271e;
  --accent: #f7e3d6;
  --warning: #fff4d6;
}

* { box-sizing: border-box; }

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

a { color: var(--brand-dark); }
a:focus-visible { outline: 3px solid #e79a61; outline-offset: 3px; }

.site-header {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
  padding: 28px 20px;
}

.site-header a { color: #fff; text-decoration: none; }
.brand { font-size: 1.35rem; font-weight: 800; letter-spacing: .01em; }
.tagline { margin: 4px 0 0; opacity: .9; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 16px;
}

.nav a { text-decoration: underline; text-underline-offset: 3px; }

main {
  width: min(860px, calc(100% - 32px));
  margin: 34px auto 60px;
}

h1, h2, h3 { line-height: 1.25; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 6vw, 3rem); }
h2 { margin-top: 34px; font-size: 1.45rem; }
h3 { margin-top: 24px; font-size: 1.12rem; }
.lede { color: var(--muted); font-size: 1.08rem; }
.updated { color: var(--muted); font-size: .92rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin: 28px 0;
}

.card, .notice {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}

.card h2, .card h3 { margin-top: 0; }
.notice { background: var(--warning); border-color: #e8cf85; }
.button {
  display: inline-block;
  padding: 10px 15px;
  border-radius: 9px;
  background: var(--brand-dark);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

ul, ol { padding-left: 1.3rem; }
li + li { margin-top: 8px; }
table { width: 100%; border-collapse: collapse; margin: 20px 0; }
th, td { border: 1px solid var(--line); padding: 12px; text-align: left; vertical-align: top; }
th { background: var(--accent); }

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 16px 40px;
  text-align: center;
}

code { background: var(--accent); padding: 2px 5px; border-radius: 4px; }

@media (max-width: 620px) {
  .site-header { padding: 22px 16px; }
  main { margin-top: 26px; }
  table, tbody, tr, th, td { display: block; }
  th { border-bottom: 0; }
  td { margin-bottom: 12px; }
}