:root {
  color-scheme: light;
  --ink: #18212f;
  --muted: #5e6b7c;
  --line: #dce3ec;
  --surface: #ffffff;
  --accent: #2457d6;
  --bg: #f4f7fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

.shell {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 48px;
}

.shell.narrow { width: min(760px, calc(100% - 32px)); }

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .16em;
}

h1, h2 { line-height: 1.25; }
h1 { margin: 0 0 18px; font-size: clamp(2rem, 5vw, 3.6rem); letter-spacing: -.03em; }
h2 { margin: 0 0 14px; font-size: 1.25rem; }

.hero { margin-bottom: 32px; }
.lead { max-width: 680px; margin: 0; color: var(--muted); font-size: 1.15rem; }
.updated { color: var(--muted); font-size: .9rem; }

.card {
  margin: 18px 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(34, 52, 84, .05);
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.grid .card { margin: 0; }

ul { padding-left: 1.3rem; }
.prose h2:not(:first-child) { margin-top: 30px; }
.prose p:last-child, .prose ul:last-child { margin-bottom: 0; }

.links { display: flex; flex-wrap: wrap; gap: 20px; margin: 28px 0; }
a { color: var(--accent); font-weight: 650; }
a:hover { color: #173b98; }

footer { color: var(--muted); font-size: .9rem; }

@media (max-width: 640px) {
  .shell { padding-top: 44px; }
  .grid { grid-template-columns: 1fr; }
  .card { padding: 22px; }
}