:root {
  --ground: #faf6f1;
  --ink: #2f2a26;
  --faint: #7a716a;
  --rule: #eadfd5;
  --coral: #c9705a;
  --mark: #fff1a8;
  --mark-ink: #5a4a00;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #1b1816;
    --ink: #efe8e2;
    --faint: #a89e96;
    --rule: #3a332e;
    --coral: #e3907b;
    --mark: #4a3f10;
    --mark-ink: #ffe27a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

header .brand {
  color: var(--coral);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

h1 {
  font-size: 1.8rem;
  line-height: 1.4;
  margin: 0.6rem 0 0.4rem;
}

.meta {
  color: var(--faint);
  font-size: 0.9rem;
  margin: 0 0 2.5rem;
}

h2 {
  font-size: 1.15rem;
  margin: 2.8rem 0 0.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule);
}

h3 {
  font-size: 1rem;
  margin: 1.6rem 0 0.4rem;
}

p, li { margin: 0.4rem 0; }
ul, ol { padding-left: 1.4rem; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.8rem 0;
  font-size: 0.95rem;
}

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

th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--rule);
}

th { color: var(--faint); font-weight: 600; white-space: nowrap; }

td:first-child { min-width: 8em; font-weight: 600; }

a { color: var(--coral); }

mark.todo {
  background: var(--mark);
  color: var(--mark-ink);
  padding: 0 0.25rem;
  border-radius: 3px;
  font-weight: 600;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--faint);
  font-size: 0.9rem;
}

footer nav a { margin-right: 1.2rem; }