:root {
  --color-text: #1f2a30;
  --color-muted: #657178;
  --color-accent: #1a6670;
  --color-accent-dark: #124c54;
  --color-border: #d9e1e4;
  --color-bg: #f5f7f7;
  --color-white: #ffffff;
  --content-width: 920px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", YuGothic, Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

a:focus-visible {
  outline: 3px solid rgba(26, 102, 112, 0.3);
  outline-offset: 3px;
}

img {
  max-width: 100%;
  height: auto;
}

.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  width: min(calc(100% - 40px), 1120px);
  min-height: 88px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo img {
  display: block;
  width: 152px;
}

.site-logo__text {
  display: none;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 22px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

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

.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

.page-hero {
  padding: 72px 20px 44px;
  text-align: center;
}

.page-hero__eyebrow {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.page-hero__lead {
  max-width: 720px;
  margin: 22px auto 0;
  color: var(--color-muted);
  text-align: left;
}

.page-main {
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto 96px;
  padding: clamp(28px, 5vw, 58px);
  background: var(--color-white);
  border: 1px solid var(--color-border);
}

.document-section + .document-section {
  margin-top: 56px;
  padding-top: 52px;
  border-top: 1px solid var(--color-border);
}

.document-section h2 {
  margin: 0 0 24px;
  padding-left: 18px;
  border-left: 4px solid var(--color-accent);
  color: var(--color-accent-dark);
  font-size: clamp(21px, 3vw, 27px);
  line-height: 1.55;
}

.document-section h3 {
  margin: 34px 0 14px;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.6;
}

.document-section h4 {
  margin: 26px 0 10px;
  font-size: 16px;
}

.document-section p {
  margin: 0 0 1em;
}

.document-section ul,
.document-section ol {
  margin: 1em 0;
  padding-left: 1.7em;
}

.document-section li + li {
  margin-top: 0.35em;
}

.note-box,
.link-box,
.contact-box {
  margin-top: 26px;
  padding: 24px;
  background: #f4f8f8;
  border: 1px solid #cedddd;
}

.note-box p:last-child,
.link-box p:last-child,
.contact-box p:last-child {
  margin-bottom: 0;
}

.contact-list {
  display: grid;
  grid-template-columns: 9em 1fr;
  gap: 7px 20px;
  margin: 0;
}

.contact-list dt {
  font-weight: 700;
}

.contact-list dd {
  margin: 0;
}

.document-date {
  margin-top: 38px;
  color: var(--color-muted);
  font-size: 14px;
}

.site-footer {
  padding: 38px 20px;
  color: #d9e2e4;
  background: #1e292e;
  text-align: center;
}

.site-footer a {
  color: var(--color-white);
}

.site-footer__logo {
  display: inline-block;
  margin-bottom: 16px;
}

.site-footer__logo img {
  width: 142px;
}

.site-footer__logo-text {
  display: none;
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.site-footer small {
  font-size: 12px;
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
    line-height: 1.85;
  }

  .site-header__inner {
    width: min(calc(100% - 28px), 1120px);
    min-height: auto;
    padding: 18px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-logo img {
    width: 132px;
  }

  .site-nav {
    justify-content: flex-start;
    gap: 6px 18px;
    font-size: 12px;
  }

  .page-hero {
    padding: 50px 20px 32px;
  }

  .page-main {
    width: min(calc(100% - 24px), var(--content-width));
    margin-bottom: 64px;
    padding: 28px 20px 40px;
  }

  .document-section + .document-section {
    margin-top: 42px;
    padding-top: 40px;
  }

  .document-section h2 {
    padding-left: 14px;
  }

  .contact-list {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .contact-list dd + dt {
    margin-top: 10px;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  .site-header,
  .site-footer {
    display: none;
  }

  .page-hero {
    padding: 0 0 24px;
  }

  .page-main {
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
  }

  .document-section + .document-section {
    break-before: auto;
  }

  a {
    color: inherit;
  }
}