:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --text: #16140f;
  --muted: #6b6557;
  --accent: #003399;
  --line: #dcd6c8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.125rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1.5rem;
  top: 1.5rem;
  transform: translateY(-200%);
  padding: 0.5rem 0.75rem;
  background: var(--text);
  color: var(--bg);
}

.skip-link:focus {
  transform: translateY(0);
}

.page {
  width: min(72rem, calc(100% - 3rem));
  margin: 0 auto;
  padding: 2.5rem 0 6rem;
}

header {
  margin-bottom: 4rem;
}

.site-label {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 1.125rem;
}

header h1 {
  margin: 0;
  line-height: 0;
}

.site-logo {
  display: block;
  width: min(100%, 36rem);
  height: auto;
}

.header-rule {
  height: 1px;
  margin: 2rem 0 1rem;
  background: var(--line);
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.75rem;
  font-size: 1.125rem;
}

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

header nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.intro {
  max-width: 18em;
  margin: 0 0 2rem;
  color: var(--text);
  font-size: clamp(2rem, 5vw, 3.75rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.summary {
  max-width: 36em;
  margin: 0 0 1rem;
  font-size: 1.25rem;
  line-height: 1.5;
}

section {
  padding: 4rem 0 0;
}

section:first-of-type {
  margin-top: 4rem;
}

h2 {
  margin: 0 0 1.5rem;
  color: var(--text);
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

h3 {
  margin: 2.5rem 0 0.75rem;
  color: var(--text);
  font-size: 1.375rem;
  font-weight: 400;
  letter-spacing: -0.02em;
}

p {
  margin: 0.75rem 0;
  max-width: 40em;
}

ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  max-width: 42em;
}

li + li {
  margin-top: 0.6rem;
}

.download-link {
  display: inline-block;
  margin: 0.5rem 0 1rem;
  color: var(--accent);
  font-size: 1.375rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  text-decoration: underline;
}

.note {
  max-width: 40em;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.55;
}

.price {
  margin: 0.25rem 0 0.75rem;
  color: var(--muted);
  font-size: 1.125rem;
}

footer {
  margin-top: 5rem;
  padding-top: 1.5rem;
  color: var(--muted);
  font-size: 1rem;
}

@media (max-width: 640px) {
  .page {
    width: min(100%, calc(100% - 2rem));
    padding-top: 1.5rem;
  }

  header {
    margin-bottom: 3rem;
  }

  .intro {
    max-width: none;
  }

  section {
    padding-top: 3rem;
  }

  section:first-of-type {
    margin-top: 3rem;
  }
}