:root {
  color-scheme: light;
  --ink: #18332d;
  --muted: #5c706b;
  --brand: #176b5b;
  --line: #d9e4e1;
  --surface: #ffffff;
  --background: #f5f9f8;
  --notice: #fff7e6;
  --notice-line: #efc66c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  word-break: keep-all;
}

a { color: var(--brand); }

.shell {
  width: min(100% - 32px, 760px);
  margin: 0 auto;
  padding: 24px 0 56px;
}

.site-header,
.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
}

.brand {
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 14px;
}

.nav a { text-underline-offset: 4px; }

main {
  margin-top: 24px;
  padding: clamp(24px, 6vw, 48px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 10px 30px rgb(24 51 45 / 6%);
}

h1 {
  margin: 0;
  font-size: clamp(30px, 7vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.04em;
}

h2 {
  margin: 36px 0 8px;
  font-size: 20px;
  line-height: 1.4;
}

p, ul { margin: 10px 0; }

ul { padding-left: 22px; }

.meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.qa-notice {
  margin: 24px 0;
  padding: 16px 18px;
  border: 1px solid var(--notice-line);
  border-radius: 12px;
  background: var(--notice);
  font-weight: 700;
}

.contact-card {
  margin-top: 24px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8fbfa;
}

.button {
  display: inline-block;
  margin-top: 10px;
  padding: 11px 16px;
  border-radius: 10px;
  color: #ffffff;
  background: var(--brand);
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 520px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .nav { gap: 6px 12px; }
  main { border-radius: 16px; }
}