:root {
  --blue: #1a6fb5;
  --blue-dark: #0d4a7e;
  --red: #d12027;
  --gold: #f5b800;
  --ink: #1c2530;
  --muted: #5a6776;
  --line: #e4e8ee;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --max: 760px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  border-top: 4px solid var(--blue);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
}
.site-header img { width: 56px; height: 56px; flex: none; }
.site-header .titles { line-height: 1.25; }
.site-header .titles a { color: var(--ink); text-decoration: none; }
.site-header .org { font-weight: 700; font-size: 19px; }
.site-header .sub { color: var(--muted); font-size: 14px; }

/* Nav */
.site-nav {
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-nav .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.site-nav a {
  color: var(--blue-dark);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
}
.site-nav a:hover { color: var(--red); }
.site-nav a.active { color: var(--red); border-bottom: 2px solid var(--red); }

/* Content */
main { padding: 40px 0 64px; }
main h1 {
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 8px;
}
main h1 + .lead { color: var(--muted); font-size: 19px; margin: 0 0 28px; }
main h2 {
  font-size: 24px;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--line);
}
main h3 { font-size: 20px; margin: 28px 0 8px; }
main p { margin: 0 0 16px; }
main a { color: var(--blue-dark); text-decoration: underline; text-underline-offset: 2px; }
main a:hover { color: var(--red); }
main ul, main ol { padding-left: 22px; }
main li { margin: 6px 0; }
main img { max-width: 100%; height: auto; border-radius: 8px; }
blockquote {
  margin: 20px 0;
  padding: 4px 20px;
  border-left: 4px solid var(--gold);
  color: var(--muted);
  font-style: italic;
}
hr { border: none; border-top: 1px solid var(--line); margin: 40px 0; }

/* Article index list */
.article-list { list-style: none; padding: 0; margin: 0; }
.article-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.article-list a { font-size: 20px; font-weight: 600; text-decoration: none; }
.article-list .meta { color: var(--muted); font-size: 15px; margin-top: 4px; }
.news-excerpt { margin-top: 8px; color: var(--ink); font-size: 16px; }
.news-more { margin-top: 6px; font-size: 15px; }
.news-more a { font-size: 15px; font-weight: 600; }

/* Cards on home */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--blue); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; color: var(--blue-dark); }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--red);
  color: #fff !important;
  text-decoration: none !important;
  padding: 11px 20px;
  border-radius: 8px;
  font-weight: 600;
}
.btn:hover { background: #a81920; }

/* Acronym decode (КНИГА) */
.acronym { list-style: none; padding: 0; margin: 24px 0; }
.acronym li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.acronym .letter {
  flex: none;
  width: 1.4em;
  font-size: 28px;
  font-weight: 800;
  color: var(--red);
  font-family: Georgia, "Times New Roman", serif;
}
.acronym .word { font-size: 19px; font-weight: 600; }
.acronym .note { color: var(--muted); font-weight: 400; font-size: 16px; }

/* Contacts */
.contacts dt { font-weight: 600; margin-top: 14px; }
.contacts dd { margin: 2px 0 0; color: var(--muted); }

/* Footer */
.site-footer {
  border-top: 4px solid var(--red);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 14px;
}
.site-footer .wrap { padding: 28px 20px; }
.site-footer a { color: var(--blue-dark); }
.site-footer .social { margin-top: 8px; }
.site-footer .social a { font-weight: 600; }

/* Certificate / diploma page */
.cert-meta { color: var(--muted); font-size: 16px; margin: 0 0 20px; }
.cert-meta strong { color: var(--ink); }
.cert-pdf {
  width: 100%;
  height: 80vh;
  min-height: 480px;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 8px 0 20px;
}
.cert-verify {
  margin-top: 24px;
  padding: 14px 18px;
  background: var(--bg-soft);
  border-left: 4px solid var(--gold);
  color: var(--muted);
  font-size: 15px;
  border-radius: 4px;
}

@media (max-width: 520px) {
  body { font-size: 17px; }
  main h1 { font-size: 27px; }
}