:root {
  color-scheme: light;
  --ink: #172433;
  --muted: #607181;
  --paper: #ffffff;
  --wash: #f1f6f9;
  --line: #d5e0e7;
  --accent: #24658f;
  --accent-dark: #163f5c;
  --focus: #8fc6e5;
  --content: 760px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
}

.topbar__inner {
  width: min(1180px, calc(100% - 40px));
  min-height: 62px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-name {
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.language-link {
  font-size: 14px;
  font-weight: 650;
}

.hero {
  background:
    linear-gradient(90deg, var(--accent) 0 7px, transparent 7px),
    var(--wash);
  border-bottom: 1px solid var(--line);
}

.hero__inner {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0 72px;
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(44px, 7vw, 84px);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.hero__summary {
  max-width: 720px;
  margin: 30px 0 0;
  color: #3b5264;
  font-size: 20px;
  line-height: 1.55;
}

.hero__meta {
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.layout {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 230px minmax(0, var(--content));
  gap: clamp(44px, 7vw, 100px);
  justify-content: start;
  padding: 64px 0 100px;
}

.toc {
  align-self: start;
  position: sticky;
  top: 28px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.toc strong {
  display: block;
  margin-bottom: 13px;
  color: var(--ink);
  font-size: 13px;
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 8px;
  margin: 0 0 11px;
}

.toc li::before {
  content: counter(toc, decimal-leading-zero);
  color: #8a9aa7;
  font-size: 11px;
  line-height: 1.9;
}

.toc a {
  color: inherit;
  text-decoration: none;
}

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

.policy {
  min-width: 0;
}

.identity {
  margin: 0 0 50px;
  padding: 22px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.identity dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.identity dd {
  margin: 4px 0 0;
  font-size: 15px;
  font-weight: 650;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.policy section {
  scroll-margin-top: 28px;
  padding: 0 0 48px;
}

.policy section + section {
  border-top: 1px solid var(--line);
  padding-top: 48px;
}

.policy h2 {
  margin: 0 0 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(28px, 4vw, 39px);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.policy h3 {
  margin: 30px 0 10px;
  font-size: 17px;
  line-height: 1.4;
}

.policy p {
  margin: 0 0 18px;
}

.policy ul {
  margin: 16px 0 22px;
  padding-left: 24px;
}

.policy li {
  margin: 0 0 10px;
  padding-left: 4px;
}

.note {
  margin: 26px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--accent);
  background: var(--wash);
  color: #344c5d;
}

.footer {
  border-top: 1px solid var(--line);
  background: var(--wash);
}

.footer__inner {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 40px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 820px) {
  .hero__inner {
    padding: 54px 0 50px;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 42px;
    padding-top: 44px;
  }

  .toc {
    position: static;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--line);
  }

  .toc ol {
    columns: 2;
    column-gap: 28px;
  }

  .toc li {
    break-inside: avoid;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .topbar__inner,
  .hero__inner,
  .layout,
  .footer__inner {
    width: min(100% - 28px, 1180px);
  }

  .hero {
    background: var(--wash);
    border-left: 6px solid var(--accent);
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero__summary {
    font-size: 18px;
  }

  .toc ol {
    columns: 1;
  }

  .identity {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .footer__inner {
    flex-direction: column;
  }
}

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