:root {
  font-family: Inter, Arial, Helvetica, sans-serif;
  color: #171923;
  background: #f8f9fc;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f8f9fc;
  color: #171923;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #e7e7ef;
}

nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
  color: #171923;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-links a {
  color: #5f6472;
  text-decoration: none;
  font-size: 14px;
}

.nav-links a:hover {
  color: #10afe3;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 64px 24px 80px;
}

.hero {
  padding: 36px 0 48px;
}

h1 {
  font-size: 42px;
  line-height: 1.15;
  margin: 0 0 18px;
}

h2 {
  font-size: 23px;
  margin-top: 40px;
}

p, li {
  color: #4f5563;
  font-size: 16px;
}

.lead {
  font-size: 20px;
  max-width: 720px;
}

.card {
  background: white;
  border: 1px solid #e7e7ef;
  border-radius: 18px;
  padding: 28px;
  margin-top: 28px;
}

a {
  color: #0e9ccd;
}

footer {
  border-top: 1px solid #e7e7ef;
  background: #ffffff;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 24px;
  color: #697386;
  font-size: 13px;
}

@media (max-width: 640px) {
  h1 {
    font-size: 34px;
  }

  nav {
    align-items: flex-start;
    gap: 16px;
    flex-direction: column;
  }

  .nav-links {
    flex-wrap: wrap;
  }
}