:root {
  color-scheme: light;
  --blue: #1769e8;
  --ink: #172033;
  --muted: #5f6878;
  --line: #dfe5ee;
  --surface: #ffffff;
  --background: #f5f7fa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  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;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.nav {
  align-items: center;
  display: flex;
  gap: 14px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 940px;
  padding: 16px 22px;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: flex;
  font-size: 18px;
  font-weight: 750;
  gap: 10px;
  text-decoration: none;
}

.brand img {
  border-radius: 8px;
  height: 36px;
  width: 36px;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  margin-left: 18px;
  text-decoration: none;
}

main {
  margin: 0 auto;
  max-width: 820px;
  padding: 56px 22px 72px;
}

h1 {
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1.1;
  margin: 0 0 14px;
}

h2 {
  font-size: 21px;
  margin: 34px 0 8px;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin-bottom: 34px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.action {
  background: var(--blue);
  border-radius: 6px;
  color: #ffffff;
  display: inline-block;
  font-weight: 700;
  margin-top: 16px;
  padding: 12px 18px;
  text-decoration: none;
}

.notice {
  background: #eaf2ff;
  border-left: 4px solid var(--blue);
  margin: 28px 0;
  padding: 16px 18px;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  padding: 24px;
  text-align: center;
}

@media (max-width: 620px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  nav a {
    margin: 0 16px 0 0;
  }

  main {
    padding-top: 38px;
  }
}