:root {
  --color-bg: #ffffff;
  --color-fg: #1f2933;
  --color-muted: #52606d;
  --color-accent: #2563eb;
  --color-border: #e4e7eb;
  --color-surface: #f8fafc;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-fg);
  background: var(--color-bg);
}

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

a:hover {
  text-decoration: none;
}

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

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  color: var(--color-fg);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.site-main h1 {
  font-size: 28px;
  margin: 0 0 8px;
  line-height: 1.4;
}

.site-main h2 {
  font-size: 20px;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.site-main h3 {
  font-size: 17px;
  margin: 24px 0 8px;
  color: var(--color-fg);
}

.site-main p {
  margin: 0 0 16px;
}

.site-main ul {
  margin: 0 0 16px;
  padding-left: 1.4em;
}

.site-main li {
  margin: 4px 0;
}

.lede {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 32px;
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0;
}

.info-card h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
  font-size: 17px;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.info-list li {
  display: flex;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--color-border);
}

.info-list li:last-child {
  border-bottom: none;
}

.info-list dt {
  flex: 0 0 9em;
  color: var(--color-muted);
  font-size: 14px;
}

.info-list dd {
  margin: 0;
  flex: 1;
}

.pp-block {
  margin: 16px 0 24px;
}

.pp-block p {
  margin: 4px 0;
}

.pp-block ul {
  margin: 6px 0;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 13px;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
}

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

@media (max-width: 640px) {
  .site-main {
    padding: 32px 18px 48px;
  }

  .site-main h1 {
    font-size: 24px;
  }

  .info-list li {
    flex-direction: column;
    gap: 2px;
  }

  .info-list dt {
    flex: none;
  }
}