* { box-sizing: border-box; }
:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #142033;
  --muted: #5a6678;
  --line: #d9e2ef;
  --accent: #1a4fa3;
  --accent-dark: #123a7a;
  --soft: #eef4ff;
  --shadow: 0 14px 40px rgba(20, 32, 51, 0.08);
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: linear-gradient(180deg, #f5f8fd 0%, #edf3fb 100%);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.7;
}
.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 72px;
}
.hero {
  background: linear-gradient(135deg, #153f84 0%, #245fc0 100%);
  color: #fff;
  border-radius: 24px;
  padding: 54px 42px;
  box-shadow: var(--shadow);
  margin-bottom: 26px;
}
.compact-hero { padding: 40px 36px; }
.eyebrow {
  display: inline-block;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
h1 {
  margin: 0 0 10px;
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1.05;
}
h2 {
  margin: 0 0 14px;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.15;
  color: var(--accent-dark);
}
h3 {
  margin: 0 0 10px;
  font-size: 23px;
  line-height: 1.2;
  color: var(--accent-dark);
}
h4 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--accent-dark);
}
p, li { font-size: 18px; }
.hero h1, .hero h2, .hero p  { color: #fff; }
.hero a {  color: #1a4fa3; }
.lead {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
}
.intro {
  max-width: 920px;
  font-size: 19px;
  color: rgba(255,255,255,0.94);
}
.hero-actions { margin-top: 24px; }
.button {
  display: inline-block;
  background: #fff;
  color: var(--accent-dark);
  text-decoration: none;
  padding: 14px 20px;
  border-radius: 12px;
  font-weight: 700;
  border: 2px solid #fff;
  margin-right: 10px;
  margin-bottom: 10px;
}
.button:hover { background: transparent; color: #fff; }
.section { margin-bottom: 24px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 32px 28px;
  box-shadow: var(--shadow);
}
.highlight-card { background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%); }
.topic-grid, .link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.topic, .link-card {
  background: var(--soft);
  border: 1px solid #d7e4ff;
  border-radius: 18px;
  padding: 18px;
}
.link-card {
  display: block;
  text-decoration: none;
  color: var(--text);
}
.link-card span, .topic p, .muted, .footer p, .faq-item p, .feature-list li, .toc li a {
  color: var(--muted);
}
.feature-list { margin: 0; padding-left: 22px; }
.feature-list li { margin-bottom: 12px; }
.faq-item { padding: 24px 0; border-top: 1px solid var(--line); }
.faq-item:first-of-type { border-top: 0; padding-top: 4px; }
.callout {
  background: #fff9ea;
  border: 1px solid #f2ddb0;
  border-radius: 18px;
  padding: 18px 20px;
  margin-top: 16px;
}
.callout strong { color: #7c5b00; }
.meta-line {
  font-size: 14px;
  color: rgba(255,255,255,0.85);
  margin-top: 8px;
}
.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 0.9fr);
  gap: 24px;
}
.sidebar-stack { display: grid; gap: 18px; align-self: start; position: sticky; top: 16px; }
.toc { margin: 0; padding-left: 18px; }
.toc li { margin-bottom: 10px; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.related-links {
  display: grid;
  gap: 10px;
}
.related-links a {
  text-decoration: none;
  color: var(--accent-dark);
}
.related-links a:hover { text-decoration: underline; }
.footer {
  text-align: center;
  padding-top: 10px;
}
.footer a {
  color: var(--accent);
  text-decoration: none;
}
.footer a:hover { text-decoration: underline; }
.badge {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e8f0ff;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 700;
  margin-right: 8px;
  margin-bottom: 8px;
}
@media (max-width: 900px) {
  .content-layout { grid-template-columns: 1fr; }
  .sidebar-stack { position: static; }
}
@media (max-width: 780px) {
  .page-shell { width: min(100% - 20px, 1180px); padding-top: 14px; }
  .hero, .card { padding: 24px 18px; border-radius: 18px; }
  .topic-grid, .link-grid { grid-template-columns: 1fr; }
  p, li { font-size: 17px; }
  .lead { font-size: 22px; }
}