:root {
  color-scheme: light;
  --navy: #12233f;
  --navy-soft: #263b5f;
  --mint: #62c9b2;
  --mint-pale: #eaf8f4;
  --paper: #ffffff;
  --background: #f5f7fa;
  --text: #182235;
  --muted: #617087;
  --line: #dce3ec;
  --shadow: 0 12px 32px rgba(18, 35, 63, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

a {
  color: #136b82;
  text-underline-offset: 0.2em;
}

a:focus-visible,
.document-card:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 4px;
  border-radius: 8px;
}

.container {
  width: min(100% - 32px, 880px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(220, 227, 236, 0.9);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
}

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

.brand {
  color: var(--navy);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  font-size: 0.9rem;
}

nav a {
  color: var(--navy-soft);
  text-decoration: none;
}

.home {
  padding-block: 72px 80px;
}

.hero {
  padding: 48px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(135deg, var(--paper), var(--mint-pale));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 4px;
  color: #277e6c;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1.25;
}

.hero p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.document-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.document-card {
  min-height: 220px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 150ms ease, border-color 150ms ease;
}

.document-card:hover {
  transform: translateY(-2px);
  border-color: var(--mint);
}

.document-card span {
  display: block;
  color: #277e6c;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.document-card strong {
  display: block;
  margin-top: 8px;
  color: var(--navy);
  font-size: 1.3rem;
}

.document-card p {
  color: var(--muted);
}

.operator {
  margin-top: 28px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
}

.operator h2 {
  margin-top: 0;
}

.operator dl {
  margin: 0;
}

.operator dl div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding-block: 12px;
  border-top: 1px solid var(--line);
}

.operator dt {
  color: var(--muted);
  font-weight: 700;
}

.operator dd {
  margin: 0;
}

.legal-document {
  margin-block: 48px 72px;
  padding: clamp(24px, 6vw, 56px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.legal-document h1 {
  margin-top: 0;
  color: var(--navy);
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  line-height: 1.35;
}

.legal-document h2 {
  margin-top: 2.4em;
  padding-bottom: 0.35em;
  border-bottom: 2px solid var(--mint-pale);
  color: var(--navy);
  font-size: 1.35rem;
  line-height: 1.5;
}

.legal-document h3 {
  margin-top: 1.8em;
  color: var(--navy-soft);
  font-size: 1.08rem;
}

.legal-document ul,
.legal-document ol {
  padding-left: 1.5em;
}

.legal-document li + li {
  margin-top: 0.25em;
}

.legal-document hr {
  margin-block: 2.5rem;
  border: 0;
  border-top: 1px solid var(--line);
}

.site-footer {
  padding-block: 32px;
  border-top: 1px solid var(--line);
  background: var(--navy);
  color: #e8eef8;
  font-size: 0.88rem;
}

.site-footer p {
  margin: 4px 0;
}

.site-footer a {
  color: #9ce3d4;
}

@media (max-width: 680px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-block: 14px;
  }

  nav {
    width: 100%;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 2px;
    white-space: nowrap;
  }

  .home {
    padding-top: 32px;
  }

  .hero {
    padding: 28px 24px;
  }

  .document-links {
    grid-template-columns: 1fr;
  }

  .operator {
    padding: 24px;
  }

  .operator dl div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .legal-document {
    width: min(100% - 20px, 880px);
    margin-top: 20px;
    padding: 24px 20px;
    border-radius: 16px;
  }
}

.support-page {
  margin-block: 48px 72px;
}

.support-hero,
.support-section,
.contact-card {
  margin-bottom: 24px;
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.support-hero {
  background: linear-gradient(135deg, var(--paper), var(--mint-pale));
}

.support-hero h1 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.3;
}

.support-hero p,
.support-section > p {
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fbfcfe;
}

.faq-item h3 {
  margin: 0 0 8px;
  color: var(--navy);
  font-size: 1.05rem;
}

.faq-item p {
  margin: 0;
}

.contact-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 12px 20px;
  border-radius: 12px;
  background: var(--navy);
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.contact-button:hover {
  background: var(--navy-soft);
}

.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--mint);
  border-radius: 8px;
  background: var(--mint-pale);
}

@media (max-width: 900px) {
  .document-links {
    grid-template-columns: 1fr;
  }
}