:root {
  --background: #f5f7fa;
  --surface: #ffffff;
  --surface-muted: #eef2f6;
  --text: #16202b;
  --text-soft: #4b5a6a;
  --line: #d7dee6;
  --accent: #1f4b7a;
  --accent-soft: #edf4fb;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: linear-gradient(180deg, #f7f9fc 0%, #eef3f8 100%);
  word-break: keep-all;
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.container {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(215, 222, 230, 0.9);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-nav a,
.site-footer a {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero {
  padding: 80px 0 40px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.hero h1,
.page-heading h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.12;
}

.lead {
  margin: 18px 0 0;
  font-size: 1.2rem;
  color: var(--text);
}

.summary {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--text-soft);
}

.button-row,
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  border: 1px solid var(--accent);
}

.button:hover {
  text-decoration: none;
  opacity: 0.92;
}

.button.secondary {
  background: #ffffff;
  color: var(--accent);
}

.section,
.document-page {
  padding: 28px 0 48px;
}

.section-muted {
  padding-top: 8px;
}

.section-heading {
  margin-bottom: 22px;
}

.section-heading h2,
.document h2 {
  margin: 0 0 10px;
  font-size: 1.45rem;
}

.section-heading h2 span {
  color: var(--text-soft);
  font-size: 0.95rem;
  font-weight: 600;
}

.section-heading p,
.document p,
.document li {
  color: var(--text-soft);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card,
.document,
.info-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 24px;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 14px;
  font-size: 1.08rem;
}

.library-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.library-card p {
  margin: 0;
}

.detail-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.detail-list li + li {
  margin-top: 10px;
}

.detail-list strong {
  display: block;
  margin-bottom: 2px;
  color: var(--text);
}

.detail-list span {
  color: var(--text-soft);
}

.card ul,
.document ul {
  margin: 0;
  padding-left: 20px;
}

.library-card .detail-list {
  margin-top: 18px;
  padding-left: 0;
}

.info-panel {
  padding: 24px;
}

.note {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.page-heading {
  margin-bottom: 24px;
}

.document {
  padding: 28px;
  overflow-wrap: anywhere;
}

.document section + section {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

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

.meta-list dt {
  font-weight: 700;
  color: var(--text);
}

.meta-list dd {
  margin: 6px 0 0;
  color: var(--text-soft);
}

.text-link {
  font-weight: 600;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
}

.site-footer p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

@media (max-width: 820px) {
  .header-inner,
  .footer-inner,
  .meta-list {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .card-grid,
  .library-grid,
  .meta-list {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 56px;
  }

  .document,
  .card,
  .info-panel {
    padding: 22px;
  }
}

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

  .container {
    width: min(calc(100% - 24px), var(--max-width));
  }

  .site-nav {
    gap: 12px;
  }

  .site-nav a,
  .site-footer a,
  .site-footer p {
    font-size: 0.92rem;
  }

  .button,
  .text-link {
    width: 100%;
  }
}