:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --text: #172033;
  --text-muted: #52607a;
  --line: #d7deea;
  --line-strong: #c3cddd;
  --accent: #1f4a7c;
  --accent-soft: #e9f0f8;
  --max-width: 1120px;
  --article-width: 760px;
  --shadow: 0 12px 36px rgba(23, 32, 51, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.65;
}

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

a:hover {
  text-decoration: underline;
}

code {
  padding: 0.08rem 0.32rem;
  border-radius: 999px;
  background: #eef3f9;
  color: #14375e;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.page-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(195, 205, 221, 0.7);
}

.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--surface-muted);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-family: "Baskerville", "Palatino Linotype", Georgia, serif;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 1rem;
  font-weight: 700;
}

.brand-copy span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.topbar-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--accent);
  font-size: 0.92rem;
}

.topbar-link:hover {
  text-decoration: none;
  background: var(--accent-soft);
}

.intro {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 36px 24px 18px;
}

.intro-card {
  padding: 28px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.intro h1 {
  margin: 0;
  font-family: "Baskerville", "Palatino Linotype", Georgia, serif;
  font-size: clamp(2rem, 3.4vw, 3.2rem);
  line-height: 1.08;
  font-weight: 700;
}

.intro p {
  margin: 14px 0 0;
  max-width: 820px;
  color: var(--text-muted);
  font-size: 1rem;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.meta-pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--surface-muted);
  border: 1px solid var(--line);
  color: var(--text-muted);
  font-size: 0.92rem;
}

.layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 24px 64px;
  display: grid;
  grid-template-columns: 280px minmax(0, var(--article-width));
  gap: 28px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 88px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.toc h2 {
  margin: 0 0 14px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.toc ol,
.toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.toc a {
  display: block;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--text-muted);
  line-height: 1.45;
}

.toc a:hover {
  text-decoration: none;
  background: var(--accent-soft);
  color: var(--accent);
}

.card-grid {
  display: grid;
  gap: 16px;
}

.doc-card,
.policy-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.doc-card {
  padding: 22px 24px;
}

.doc-card h2 {
  margin: 0 0 10px;
  font-family: "Baskerville", "Palatino Linotype", Georgia, serif;
  font-size: 1.7rem;
  line-height: 1.15;
}

.doc-card p {
  margin: 0;
  color: var(--text-muted);
}

.doc-card .actions,
.notice-box .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.policy-card {
  padding: 30px 32px;
}

.notice-box {
  margin-bottom: 26px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.notice-box p {
  margin: 0;
  color: var(--text-muted);
}

.policy-card section + section {
  margin-top: 30px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.policy-card h2 {
  margin: 0 0 12px;
  font-family: "Baskerville", "Palatino Linotype", Georgia, serif;
  font-size: clamp(1.55rem, 2.1vw, 2rem);
  line-height: 1.15;
}

.policy-card h3 {
  margin: 18px 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
}

.policy-card p {
  margin: 0;
  color: var(--text-muted);
}

.policy-card p + p {
  margin-top: 12px;
}

.policy-card ul,
.policy-card ol {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--text-muted);
}

.policy-card li + li {
  margin-top: 8px;
}

.data-list {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.data-item {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.data-item strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 14px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--accent);
  font-weight: 600;
}

.button:hover {
  text-decoration: none;
  background: var(--accent-soft);
}

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

.button-primary:hover {
  background: #173d67;
}

.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 36px;
}

.footer-card {
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text-muted);
  box-shadow: var(--shadow);
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 680px) {
  .topbar-inner,
  .intro,
  .layout,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .intro-card,
  .policy-card,
  .doc-card,
  .footer-card {
    padding-left: 18px;
    padding-right: 18px;
  }

  .doc-card .actions,
  .notice-box .actions {
    flex-direction: column;
    align-items: stretch;
  }
}