:root {
  --page-max: 900px;
  --gap: 24px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  background: var(--bg);
  color: var(--fg);
}

.header__inner,
.footer__inner,
main {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--gap);
}

.header {
  border-bottom: 4px solid var(--accent);
}

.header__title {
  font-size: 28px;
  letter-spacing: 0.04em;
  margin: 0;
}

.banner {
  border: 3px solid var(--accent);
  background: var(--banner-bg);
  padding: 16px 20px;
  margin-bottom: var(--gap);
}

.banner__line {
  margin: 4px 0;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.08em;
}

.identity__list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 20px;
  margin: 0 0 var(--gap) 0;
  padding: 16px 20px;
  border: 1px solid var(--rule);
}

.identity__list dt {
  font-weight: 700;
  letter-spacing: 0.06em;
}

.identity__list dd {
  margin: 0;
  font-family: ui-monospace, Consolas, "Courier New", monospace;
}

.notice h2 {
  font-size: 18px;
  margin: var(--gap) 0 8px;
}

.notice p {
  margin: 0 0 12px;
}

.footer {
  border-top: 1px solid var(--rule);
  margin-top: var(--gap);
}

.footer__note {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.04em;
}

@media (max-width: 480px) {
  .header__title { font-size: 22px; }
  .banner__line { font-size: 17px; }
  .identity__list { grid-template-columns: 1fr; }
}