:root {
  --ink: #23201d;
  --ink-dim: #6c645c;
  --ink-faint: #9a918a;
  --bg: #faf7f3;
  --card: #ffffff;
  --line: #e8e0d7;
  --tomato: #e8503a;
  --vine: #5b8c5a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2ece6;
    --ink-dim: #a79d94;
    --ink-faint: #6f665f;
    --bg: #17130f;
    --card: #211c17;
    --line: #322a23;
    --tomato: #ff6a52;
    --vine: #7aab78;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans", "Noto Sans CJK SC", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
}

header.masthead {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}

.mark {
  width: 44px;
  height: 44px;
  flex: none;
  display: block;
  border-radius: 11px;
}

.masthead h1 {
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  margin: 0;
  line-height: 1.2;
}

.masthead .sub {
  display: block;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-dim);
  letter-spacing: 0.01em;
  margin-top: 0.15rem;
}

nav.langs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

nav.langs button {
  font: inherit;
  font-size: 0.8rem;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.75rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

nav.langs button:hover { border-color: var(--ink-faint); color: var(--ink); }

nav.langs button[aria-current="true"] {
  background: var(--tomato);
  border-color: var(--tomato);
  color: #fff;
}

[data-lang] { display: none; }
[data-lang].on { display: block; }

h2 {
  font-size: 1.05rem;
  letter-spacing: -0.005em;
  margin: 2.5rem 0 0.6rem;
}

h2:first-of-type { margin-top: 0; }

p { margin: 0 0 1rem; }

.lede {
  font-size: 1.1rem;
  line-height: 1.6;
  padding: 1.15rem 1.3rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--vine);
  border-radius: 10px;
  margin-bottom: 2rem;
}

ul { margin: 0 0 1rem; padding-left: 1.15rem; }
li { margin-bottom: 0.35rem; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86em;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.4em;
}

a { color: var(--tomato); text-decoration-thickness: 1px; text-underline-offset: 2px; }

.updated {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--ink-faint);
}

footer.site {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem 3.5rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

footer.site a { color: var(--ink-dim); }