:root {
  color-scheme: light;
  --navy: #163b5c;
  --navy-dark: #102d45;
  --orange: #e28b32;
  --orange-light: #ffe8d2;
  --surface: #ffffff;
  --background: #eef5f9;
  --text: #142b3d;
  --muted: #5f7180;
  --border: #d5e3ed;
  --focus: #ffd19f;
  --danger: #a52626;
  --shadow: 0 12px 30px rgba(22, 59, 92, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

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

a:hover {
  color: #0d6591;
}

a:focus-visible {
  border-radius: 4px;
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.site-header {
  background: var(--orange);
  color: var(--surface);
}

.header-inner,
.footer-inner,
.page-shell {
  width: min(100% - 32px, 960px);
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  color: var(--surface);
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-link:hover {
  color: var(--surface);
}

.brand-link .brand-y {
  color: var(--navy);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px 18px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--surface);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.35em;
}

.page-shell {
  padding-block: 40px 64px;
}

.hero {
  background: var(--navy);
  color: var(--surface);
  padding-block: clamp(56px, 9vw, 96px);
}

.hero-inner {
  width: min(100% - 32px, 900px);
  margin-inline: auto;
  text-align: center;
}

.wordmark {
  margin: 0;
  font-size: clamp(3rem, 10vw, 5.5rem);
  font-weight: 800;
  letter-spacing: 0.025em;
  line-height: 1;
}

.wordmark .brand-y {
  color: var(--orange);
}

.tagline {
  margin: 24px 0 8px;
  font-size: clamp(1.25rem, 4vw, 1.65rem);
  font-weight: 700;
}

.hero-description {
  margin: 0;
  color: #dce9f2;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.link-card {
  display: block;
  min-height: 120px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.link-card:hover {
  border-color: var(--orange);
  color: var(--navy);
}

.link-card h2 {
  margin: 0 0 4px;
  color: var(--navy);
  font-size: 1.15rem;
}

.link-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.contact-panel {
  margin-top: 28px;
  padding: 20px 22px;
  border-radius: 14px;
  background: var(--orange-light);
}

.contact-panel h2 {
  margin: 0 0 4px;
  font-size: 1.15rem;
}

.contact-panel p {
  margin: 0;
}

.legal-card {
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.legal-card h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.65rem, 5vw, 2.35rem);
  line-height: 1.35;
}

.document-date {
  margin: 8px 0 32px;
  color: var(--muted);
  font-size: 0.92rem;
}

.legal-card h2 {
  margin: 2.4rem 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--border);
  color: var(--navy);
  font-size: 1.35rem;
  line-height: 1.45;
}

.legal-card h3 {
  margin: 1.6rem 0 0.4rem;
  color: var(--navy);
  font-size: 1.08rem;
}

.legal-card p {
  margin: 0.7rem 0;
}

.legal-card ul,
.legal-card ol {
  padding-left: 1.5rem;
}

.legal-card li + li {
  margin-top: 0.35rem;
}

.steps,
.notice,
.warning {
  margin-block: 22px;
  padding: 18px 20px;
  border-radius: 12px;
}

.steps {
  border-left: 5px solid var(--orange);
  background: var(--orange-light);
}

.steps p {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 750;
}

.notice {
  border: 1px solid var(--border);
  background: #f4f8fb;
}

.warning {
  border: 1px solid #e9b6b6;
  background: #fff1f1;
  color: #671b1b;
}

.site-footer {
  background: var(--navy-dark);
  color: #dce9f2;
}

.footer-inner {
  padding-block: 30px;
}

.footer-brand {
  margin: 0 0 10px;
  color: var(--surface);
  font-size: 1.15rem;
  font-weight: 800;
}

.footer-links {
  display: flex;
  gap: 8px 18px;
  flex-wrap: wrap;
}

.footer-links a,
.footer-contact a {
  color: #dce9f2;
}

.footer-contact {
  margin: 12px 0 0;
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .header-inner {
    min-height: auto;
    padding-block: 12px;
    align-items: flex-start;
  }

  .site-nav {
    max-width: 230px;
    gap: 2px 14px;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

  .page-shell {
    padding-block: 24px 40px;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }

  .legal-card {
    border-radius: 12px;
  }
}

@media (max-width: 360px) {
  .header-inner {
    display: block;
  }

  .site-nav {
    max-width: none;
    margin-top: 8px;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}