:root {
  --color-bg: #ffffff;
  --color-text: #1c2430;
  --color-muted: #5b6472;
  --color-border: #e2e6eb;
  --color-primary: #0f6e5c;
  --color-primary-dark: #0b5346;
  --color-surface: #f6f8f9;
  --color-warning-bg: #fff7e6;
  --color-warning-border: #f0c36d;
  --max-width: 780px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, Roboto, Arial,
    sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

a { color: var(--color-primary); }
a:hover { color: var(--color-primary-dark); }

header.site-header {
  border-bottom: 1px solid var(--color-border);
}

.site-header .bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.site-header .brand-mark {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-text);
}

.site-header nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
}

.site-header nav a {
  text-decoration: none;
  color: var(--color-muted);
}

.site-header nav a:hover { color: var(--color-primary); }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

h1 {
  font-size: 1.7rem;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2.25rem;
  border-left: 4px solid var(--color-primary);
  padding-left: 0.6rem;
}

h3 { font-size: 1.05rem; }

p { margin: 0.9rem 0; }

.lede {
  color: var(--color-muted);
  font-size: 1.02rem;
}

.meta-line {
  font-size: 0.88rem;
  color: var(--color-muted);
  margin: 0.4rem 0 1.5rem;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.1rem 1.25rem;
  background: var(--color-surface);
  margin: 1.25rem 0;
}

.cta-box {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.25rem;
  background: var(--color-surface);
  text-align: center;
  margin: 1.75rem 0;
}

.cta-button {
  display: inline-block;
  margin-top: 0.6rem;
  padding: 0.7rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.cta-button:hover { background: var(--color-primary-dark); color: #fff; }

.notice {
  border: 1px solid var(--color-warning-border);
  background: var(--color-warning-bg);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  font-size: 0.92rem;
  margin: 1.25rem 0;
}

ul, ol { padding-left: 1.4rem; }
li { margin: 0.35rem 0; }

.table-scroll {
  overflow-x: auto;
  margin: 1rem 0;
  -webkit-overflow-scrolling: touch;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 420px;
  margin: 0;
  font-size: 0.92rem;
}

th, td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

th { background: var(--color-surface); }

details {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  margin: 0.6rem 0;
}

summary {
  font-weight: 600;
  cursor: pointer;
}

summary::marker { color: var(--color-primary); }

footer.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.site-footer .bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.site-footer nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
  margin: 0 0 1rem;
  padding: 0;
}

.site-footer nav a {
  color: var(--color-muted);
  text-decoration: none;
}

.site-footer nav a:hover { color: var(--color-primary); }

.brand-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.brand-list li {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}

.brand-list a {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.brand-list p {
  margin: 0.4rem 0 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}