:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --blue: #496b91;
  --green: #36b7a8;
  --max: 820px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
               "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

header {
  background: linear-gradient(135deg, #496b91, #345473);
  color: white;
}

.header-inner,
main,
footer {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.header-inner {
  padding: 56px 0 48px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 34px;
  letter-spacing: -0.5px;
}

header p {
  margin: 0;
  opacity: .88;
  font-size: 17px;
}

nav {
  margin-top: 24px;
}

nav a {
  color: white;
  margin-right: 22px;
  text-decoration: none;
  opacity: .9;
}

nav a:hover {
  opacity: 1;
  text-decoration: underline;
}

main {
  padding: 42px 0 64px;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 30px;
  margin-bottom: 22px;
}

h2 {
  margin-top: 0;
  font-size: 23px;
}

h3 {
  margin-bottom: 6px;
}

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

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

a {
  color: var(--blue);
}

.tagline {
  font-size: 19px;
}

.feature-list li {
  margin-bottom: 8px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 32px 0;
}

footer {
  padding: 0 0 42px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 600px) {
  .header-inner {
    padding: 42px 0 36px;
  }

  header h1 {
    font-size: 29px;
  }

  section {
    padding: 22px;
  }
}