:root {
  color-scheme: light;
  --accent: #2563eb;
  --background: #e8edf5;
  --border: #d5dce8;
  --ink: #151a23;
  --muted: #657184;
  --surface: #ffffff;
}

* {
  box-sizing: border-box;
}

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

a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.action-button {
  appearance: none;
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  min-height: 44px;
  padding: 10px 14px;
}

.action-button:hover {
  background: #1d4ed8;
}

.page {
  margin: 0 auto;
  max-width: 920px;
  padding: 28px 18px 56px;
}

.topbar,
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.topbar {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding: 16px;
}

.brand {
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero,
.section {
  margin-top: 16px;
  padding: 22px;
}

.hero h1 {
  font-size: clamp(32px, 8vw, 56px);
  letter-spacing: 0;
  line-height: 1.05;
  margin: 0;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin: 14px 0 0;
}

h2 {
  font-size: 24px;
  line-height: 1.25;
  margin: 0 0 12px;
}

h3 {
  font-size: 18px;
  margin: 18px 0 8px;
}

p,
li {
  color: var(--muted);
}

ul {
  padding-left: 22px;
}

.grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.tile {
  background: #f2f5fa;
  border-radius: 8px;
  padding: 14px;
}

.tile strong {
  color: var(--ink);
  display: block;
}

.footer {
  color: var(--muted);
  font-size: 14px;
  margin-top: 18px;
  text-align: center;
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .section {
    padding: 18px;
  }
}