:root {
  --bg: #ffffff;
  --paper: #ffffff;
  --ink: #1f2937;
  --muted: #5b6470;
  --line: #d7dce2;
  --brand: #0b2e59;
  --brand-2: #1f5a95;
  --accent: #c43c35;
  --hero-bg: #f6f8fb;
  --caption: #4b5563;
  --max-width: 1200px;
  --reading-width: 760px;
  --shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Sans 3", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--brand-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 46, 89, 0.97);
  color: #fff;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: #fff;
  font-weight: 700;
}

.brand:hover {
  text-decoration: none;
}

.brand__box {
  display: inline-grid;
  grid-template-columns: 1fr;
  gap: 0.1rem;
  padding: 0.35rem 0.55rem;
  background: #092345;
  border: 1px solid rgba(255, 255, 255, 0.16);
  line-height: 1;
}

.brand__box span:last-child {
  color: #d5e7ff;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.top-nav a {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 600;
  font-size: 0.95rem;
}

.hero {
  background: linear-gradient(180deg, var(--hero-bg) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}

.hero__inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 3rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

h1, h2 {
  font-family: "Source Serif 4", Georgia, serif;
  letter-spacing: -0.01em;
  color: #172033;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  line-height: 1.06;
  max-width: 14ch;
}

.standfirst {
  margin: 1.4rem 0 0;
  font-size: 1.28rem;
  color: #334155;
  max-width: 44rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.meta span {
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,0.75);
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 220px minmax(0, var(--reading-width));
  justify-content: center;
  gap: 2.5rem;
  padding: 2.5rem 1.25rem 5rem;
}

.page-nav {
  display: block;
}

.page-nav__inner {
  position: sticky;
  top: 5.6rem;
  padding-top: 0.5rem;
}

.page-nav__title {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.page-nav a {
  display: block;
  margin: 0 0 0.9rem;
  color: #445063;
  font-size: 0.96rem;
}

.article section + section {
  margin-top: 3.25rem;
}

.article p {
  margin: 0 0 1.15rem;
  font-size: 1.1rem;
  color: #263240;
}

.article h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  line-height: 1.18;
}

.figure-block {
  margin: 2rem 0 1rem;
}

.figure-block img,
.iframe-frame {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.iframe-frame {
  overflow: hidden;
}

.iframe-frame iframe {
  display: block;
  width: 100%;
  border: 0;
}

.iframe-frame--chart iframe {
  height: 780px;
}

.iframe-frame--map iframe {
  height: 760px;
}

figcaption {
  margin-top: 0.8rem;
  font-size: 0.96rem;
  color: var(--caption);
}

figcaption strong {
  color: #202833;
}

.notes-section {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

code {
  background: #f4f6f8;
  padding: 0.12rem 0.35rem;
  border-radius: 0.25rem;
  font-size: 0.95em;
}

@media (max-width: 980px) {
  .page-shell {
    grid-template-columns: minmax(0, var(--reading-width));
  }

  .page-nav {
    display: none;
  }
}

@media (max-width: 720px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero__inner {
    padding-top: 3.4rem;
  }

  .standfirst,
  .article p {
    font-size: 1.03rem;
  }

  .iframe-frame--chart iframe {
    height: 620px;
  }

  .iframe-frame--map iframe {
    height: 560px;
  }
}