:root {
  --color-text: #222;
  --color-muted: #6b6b6b;
  --color-accent: #f6a96b;
  --color-bg: #ffffff;
  --color-card: #fafafa;
  --color-border: #e5e5e5;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header.page-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
  margin-bottom: 32px;
}

header.page-header h1 {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 600;
}

header.page-header .meta {
  font-size: 13px;
  color: var(--color-muted);
}

h2 {
  font-size: 18px;
  margin: 32px 0 12px;
  padding-bottom: 4px;
  border-left: 4px solid var(--color-accent);
  padding-left: 10px;
}

h3 {
  font-size: 15px;
  margin: 20px 0 8px;
}

p,
ul,
ol {
  margin: 0 0 12px;
}

ul,
ol {
  padding-left: 22px;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
}

.landing-card {
  display: block;
  padding: 16px 20px;
  margin: 12px 0;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text);
}

.landing-card:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

.landing-card .title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.landing-card .desc {
  font-size: 13px;
  color: var(--color-muted);
}