:root {
  --ink: #1c2b27;
  --sub: #5b6b66;
  --brand: #2ba88e;
  --brand-dark: #2e7d5f;
  --bg: #f6f8f7;
  --card: #ffffff;
  --hair: #e3eae7;
}

* { box-sizing: border-box; }

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

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

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

header.site {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  padding: 28px 20px;
}

header.site .wrap { padding: 0; max-width: 720px; margin: 0 auto; }

header.site .brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  opacity: 0.95;
}

header.site h1 {
  margin: 6px 0 0;
  font-size: 24px;
  font-weight: 700;
}

.card {
  background: var(--card);
  border: 1px solid var(--hair);
  border-radius: 16px;
  padding: 28px 24px;
  margin-top: 20px;
}

h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 8px;
  padding-top: 8px;
  color: var(--brand-dark);
}

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

h3 {
  font-size: 15px;
  font-weight: 700;
  margin: 18px 0 4px;
  color: var(--ink);
}

code {
  background: #eef3f1;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 13px;
}

p, li { color: var(--ink); }

.sub { color: var(--sub); font-size: 14px; }

ul { padding-left: 1.25em; }

li { margin: 4px 0; }

a { color: var(--brand-dark); }

.meta { color: var(--sub); font-size: 13px; margin-top: 4px; }

.nav { margin-top: 24px; font-size: 14px; }

.nav a { margin-right: 16px; text-decoration: none; font-weight: 600; }

footer {
  margin-top: 32px;
  color: var(--sub);
  font-size: 12px;
  text-align: center;
}

.note {
  background: #fff8e6;
  border: 1px solid #f0e2b8;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 13px;
  color: #7a5b00;
  margin-top: 16px;
}

.index-links { list-style: none; padding: 0; }

.index-links li { margin: 12px 0; }

.index-links a {
  display: block;
  background: var(--card);
  border: 1px solid var(--hair);
  border-radius: 14px;
  padding: 18px 20px;
  text-decoration: none;
  font-weight: 700;
  color: var(--ink);
}

.index-links a span { display: block; font-size: 13px; font-weight: 500; color: var(--sub); margin-top: 4px; }