:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #1d2733;
  --muted: #5b6878;
  --line: #d9e0ea;
  --accent: #0b7bd3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
  overflow-x: hidden;
}

main {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

header,
section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px;
  margin: 0 0 20px;
  max-width: 100%;
  min-width: 0;
}

.hero {
  padding-top: 34px;
}

h1,
h2 {
  line-height: 1.35;
  margin: 0 0 16px;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.35rem;
}

p,
li {
  color: var(--muted);
  min-width: 0;
  overflow-wrap: anywhere;
}

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

a:hover {
  text-decoration: underline;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.primary-link,
.secondary-link {
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  min-width: 0;
  padding: 10px 16px;
}

.primary-link {
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
}

.primary-link:hover {
  text-decoration: none;
  background: #096dbb;
}

.secondary-link {
  border: 1px solid var(--line);
  background: #fbfcfe;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.nav a {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 12px;
  background: #fbfcfe;
  max-width: 100%;
}

code {
  background: #eef3f9;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  padding: 2px 5px;
}

.campaign-box {
  border: 1px solid var(--line);
  border-radius: 6px;
  margin: 16px 0 0;
  padding: 14px 16px;
}

.campaign-box dt {
  color: var(--muted);
  font-size: 0.9rem;
}

.campaign-box dd {
  color: var(--text);
  font-weight: 700;
  margin: 2px 0 0;
  overflow-wrap: anywhere;
}

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

footer {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 8px 0 0;
}

@media (max-width: 520px) {
  main {
    width: 100%;
    padding-left: 12px;
    padding-right: 12px;
    padding-top: 32px;
  }

  header,
  section {
    padding: 22px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .cta-row,
  .nav {
    flex-direction: column;
  }

  .primary-link,
  .secondary-link,
  .nav a {
    justify-content: center;
    text-align: center;
    width: 100%;
  }
}