:root {
  --ink: #17202a;
  --muted: #5e6978;
  --line: #d8dee7;
  --soft: #f6f8fb;
  --accent: #0b6f88;
  --paper: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.68;
  background: var(--paper);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.brand {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
}

.nav a {
  color: var(--muted);
}

.nav a.active {
  color: var(--accent);
  font-weight: 700;
}

.hero {
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px) clamp(46px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, var(--soft));
}

.hero .kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 940px;
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero p:last-child {
  max-width: 820px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.article {
  max-width: 980px;
  padding: clamp(42px, 6vw, 76px) clamp(20px, 5vw, 72px);
}

.article-section {
  margin-bottom: 42px;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
}

p {
  margin: 0 0 16px;
}

.article-section p {
  color: var(--muted);
  font-size: 17px;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.note-link {
  display: block;
  min-height: 126px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
}

.note-link strong,
.note-link span {
  display: block;
}

.note-link strong {
  margin-bottom: 8px;
  color: var(--ink);
}

.note-link span {
  color: var(--muted);
  font-size: 14px;
}

.related {
  margin-top: 52px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.related ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  padding-left: 20px;
}

.source-links {
  margin: 34px 0 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  background: var(--soft);
}

.source-links h2 {
  font-size: 22px;
}

.source-links ul {
  margin: 0;
  padding-left: 20px;
}

.source-links li {
  margin: 8px 0;
}

.footer {
  padding: 32px clamp(20px, 5vw, 72px);
  color: #d9e2ea;
  background: #111820;
}

.footer p {
  max-width: 880px;
  color: #b9c6d3;
}

.footer a {
  color: #fff;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .note-grid,
  .related ul {
    grid-template-columns: 1fr;
  }
}