:root {
  color-scheme: light;
  --accent: #f06423;
  --accent-dark: #b83d08;
  --ink: #171717;
  --muted: #5f6368;
  --line: #e5e5e5;
  --soft: #fff7f2;
  background: #ffffff;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic",
    "YuGothic", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #ffffff;
  color: var(--ink);
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

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

.site-header {
  border-top: 6px solid var(--accent);
  border-bottom: 1px solid var(--line);
}

.header-inner,
main,
.footer-inner {
  width: min(100% - 40px, 760px);
  margin-inline: auto;
}

.header-inner {
  padding: 48px 0 40px;
}

.brand {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 6vw, 2.6rem);
  letter-spacing: -0.02em;
}

h2 {
  margin: 3rem 0 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 2px solid var(--accent);
  font-size: 1.4rem;
}

h3 {
  margin: 1.8rem 0 0.4rem;
  font-size: 1.08rem;
}

main {
  padding: 36px 0 64px;
}

p,
ul {
  margin-top: 0.6rem;
  margin-bottom: 1rem;
}

ul {
  padding-left: 1.4rem;
}

li + li {
  margin-top: 0.35rem;
}

.lead {
  font-size: 1.08rem;
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.callout {
  margin-top: 2.5rem;
  padding: 22px;
  border-left: 5px solid var(--accent);
  border-radius: 4px;
  background: var(--soft);
}

.callout h2 {
  margin-top: 0;
  border-bottom: 0;
}

.button-link {
  display: inline-block;
  min-height: 44px;
  padding: 10px 16px;
  border: 2px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.button-link:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #ffffff;
}

.page-nav {
  margin-top: 2.5rem;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner {
  padding: 24px 0 36px;
}

@media (max-width: 520px) {
  .header-inner,
  main,
  .footer-inner {
    width: min(100% - 32px, 760px);
  }

  .header-inner {
    padding: 36px 0 30px;
  }

  main {
    padding-top: 28px;
  }

  h2 {
    margin-top: 2.4rem;
  }

  .callout {
    padding: 18px;
  }
}