:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #1c5d99;
  --accent-dark: #144a7a;
  --border: #e5e7eb;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 16px;
  --max-width: 1120px;
  --font-sans: "Inter", "Noto Sans JP", system-ui, -apple-system, "Segoe UI",
    sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid rgba(28, 93, 153, 0.45);
  outline-offset: 2px;
}

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  z-index: 999;
}

.skip-link:focus {
  left: 1rem;
}

.hero {
  padding: 3.5rem 0 2rem;
  background: linear-gradient(180deg, #f8fbff 0%, #f7f9fb 100%);
  border-bottom: 1px solid var(--border);
}

.hero .container {
  position: relative;
  padding-right: clamp(120px, 22vw, 200px);
}

.hero-logo {
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(120px, 18vw, 180px);
  height: auto;
}

.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 2.6vw, 2.8rem);
  margin: 0 0 0.5rem;
}

.hero .mission {
  margin: 0.5rem 0;
  font-size: 1.3rem;
  font-weight: 600;
  color: #0136d8;
  max-width: 48rem;
}

.hero .updated {
  color: var(--muted);
  margin: 0 0 1rem;
  font-weight: 500;
}

.hero .lead {
  font-size: 1.05rem;
  max-width: 50rem;
  margin: 0 0 1.5rem;
}

.hero .lead p {
  margin: 0 0 0.75rem;
}

.hero .lead p:last-child {
  margin-bottom: 0;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
  white-space: nowrap;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.primary:hover {
  background: var(--accent-dark);
}

.btn.ghost {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}

.btn.secondary {
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.75rem;
}

.toc {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 249, 251, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.toc-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}

.toc-toggle {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-weight: 600;
}

.toc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.toc-links a {
  color: var(--text);
  font-size: 0.95rem;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
}

.toc-links a:hover {
  background: #fff;
  text-decoration: none;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: 2rem 0 3rem;
}

.sidebar {
  display: none;
}

.section {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  scroll-margin-top: 6rem;
}

.section:last-child {
  margin-bottom: 0;
}

.section h2 {
  margin-top: 0;
}

#values h2 {
  color: #0136d8;
}

.underline {
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

.section h3 {
  margin: 0 0 0.5rem;
}

.section ul,
.section ol {
  padding-left: 1.2rem;
  margin: 0;
}

.section li + li {
  margin-top: 0.4rem;
}

.summary-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.summary-list li {
  display: flex;
  flex-direction: column;
  border-left: 3px solid var(--accent);
  padding-left: 0.75rem;
}

.summary-list .label {
  font-size: 0.85rem;
  color: var(--muted);
}

.summary-list .value {
  font-weight: 600;
}

.grid-2 {
  display: grid;
  gap: 1.25rem;
}

.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 1.5rem;
}

.summary-card dl {
  display: grid;
  gap: 0.6rem;
  margin: 0 0 1rem;
}

.summary-card dt {
  font-size: 0.8rem;
  color: var(--muted);
}

.summary-card dd {
  margin: 0;
  font-weight: 600;
}

.summary-card .small {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0.75rem 0 0;
}

.highlight {
  border-color: rgba(28, 93, 153, 0.3);
  background: #eef4ff;
}

.footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  background: #fff;
}

.footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 0.5rem;
}

.callout {
  background: #f3f7ff;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(28, 93, 153, 0.2);
  margin-top: 1rem;
}

.callout h3 {
  margin-top: 0;
}

.callout p {
  margin: 0.5rem 0 0;
}

.stack > * + * {
  margin-top: 1rem;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }

  .sidebar {
    display: block;
  }
}

@media (max-width: 900px) {
  .toc-toggle {
    display: inline-flex;
  }

  .toc-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .toc-links {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-bottom: 0.75rem;
  }

  .toc[data-open="true"] .toc-links {
    display: flex;
  }
}

@media (max-width: 720px) {
  .hero .container {
    padding-right: 0;
  }

  .hero-logo {
    position: static;
    display: block;
    margin: 0 0 1rem auto;
    width: clamp(120px, 40vw, 180px);
  }
}

@media (min-width: 800px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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