:root {
  --blue: #116fdf;
  --navy: #072c59;
  --ink: #182230;
  --muted: #5b6878;
  --line: #dbe4ee;
  --soft: #f5f8fc;
  --paper: #ffffff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--blue); }
.blog-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}
.blog-nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 850; letter-spacing: -.02em; }
.brand img { width: 112px; height: auto; display: block; }
.brand span { color: var(--blue); font-size: 14px; border-left: 1px solid var(--line); padding-left: 10px; }
.nav-links { display: flex; align-items: center; gap: 18px; font-size: 13px; font-weight: 700; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--blue); }
.nav-cta { color: #fff !important; background: var(--blue); padding: 9px 14px; border-radius: 10px; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.hero { padding: 82px 0 64px; background: linear-gradient(145deg, #f7fbff 0%, #edf5ff 58%, #fff 100%); border-bottom: 1px solid var(--line); }
.eyebrow { color: var(--blue); text-transform: uppercase; letter-spacing: .15em; font-size: 11px; font-weight: 850; }
h1, h2, h3 { letter-spacing: -.04em; line-height: 1.12; }
h1 { max-width: 840px; margin: 14px 0 18px; font-size: clamp(38px, 6vw, 68px); }
.hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(17px, 2.2vw, 21px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; border-radius: 11px; padding: 12px 17px; font-weight: 800; font-size: 14px; text-decoration: none; }
.button.primary { color: #fff; background: var(--blue); box-shadow: 0 3px 0 var(--navy); }
.button.secondary { color: var(--navy); background: #fff; border: 1px solid var(--line); }
.section { padding: 58px 0; }
.section h2 { margin: 0; font-size: clamp(28px, 4vw, 42px); }
.section-intro { max-width: 760px; color: var(--muted); margin: 14px 0 28px; }
.post-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.post-card { border: 1px solid var(--line); border-radius: 16px; padding: 23px; background: var(--paper); box-shadow: 0 10px 28px rgba(7,44,89,.06); }
.post-card h2, .post-card h3 { margin: 9px 0 10px; font-size: 21px; }
.post-card p { margin: 0; color: var(--muted); font-size: 14px; }
.post-card .read { display: inline-block; margin-top: 16px; font-weight: 800; font-size: 13px; text-decoration: none; }
.topic-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin-top: 24px; }
.topic-list a { padding: 13px 14px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; font-size: 13px; font-weight: 750; color: var(--navy); background: var(--soft); }
.faq { max-width: 820px; }
.faq details { border-top: 1px solid var(--line); padding: 16px 0; }
.faq summary { cursor: pointer; font-weight: 800; }
.faq p { margin: 10px 0 0; color: var(--muted); }
.article-hero { padding: 64px 0 42px; background: linear-gradient(145deg, #f7fbff, #fff); border-bottom: 1px solid var(--line); }
.article-hero h1 { max-width: 900px; font-size: clamp(36px, 5vw, 60px); }
.article-hero .dek { max-width: 760px; color: var(--muted); font-size: 19px; }
.meta { color: var(--muted); font-size: 13px; margin-top: 16px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 46px; padding: 48px 0 72px; }
.article { max-width: 780px; font-size: 17px; }
.article h2 { margin: 40px 0 12px; font-size: 31px; }
.article h3 { margin: 28px 0 8px; font-size: 22px; }
.article p { margin: 14px 0; }
.article ul, .article ol { padding-left: 24px; }
.article li { margin: 8px 0; }
.article table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 15px; }
.article th, .article td { border: 1px solid var(--line); padding: 11px 12px; text-align: left; vertical-align: top; }
.article th { background: var(--soft); }
.callout { margin: 26px 0; padding: 18px 20px; border-left: 4px solid var(--blue); background: var(--soft); border-radius: 0 12px 12px 0; }
.callout strong { color: var(--navy); }
.sources { border-top: 1px solid var(--line); margin-top: 42px; padding-top: 22px; font-size: 14px; color: var(--muted); }
.sources ul { padding-left: 20px; }
.sidebar { position: sticky; top: 94px; align-self: start; border: 1px solid var(--line); border-radius: 14px; padding: 18px; background: var(--soft); }
.sidebar h2 { margin: 0 0 12px; font-size: 17px; }
.sidebar a { display: block; padding: 7px 0; text-decoration: none; font-size: 13px; font-weight: 700; }
.footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
@media (max-width: 820px) {
  .post-grid { grid-template-columns: 1fr 1fr; }
  .topic-list { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; order: -1; }
}
@media (max-width: 560px) {
  .blog-nav { min-height: 60px; }
  .brand img { width: 96px; }
  .brand span, .nav-links a:not(.nav-cta) { display: none; }
  .hero, .article-hero { padding-top: 54px; }
  .post-grid, .topic-list { grid-template-columns: 1fr; }
  .article { font-size: 16px; }
}