* {
  box-sizing: border-box;
}

html {
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f5f5;
  color: #222;
}

body {
  margin: 0;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.hero {
  width: 100%;
  max-width: 760px;
  background: #fff;
  padding: 56px;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

h1 {
  margin: 0 0 8px;
  font-size: 56px;
  line-height: 1;
}

.tagline {
  margin: 0 0 36px;
  font-size: 24px;
  font-weight: 600;
}

.intro {
  font-size: 21px;
  line-height: 1.5;
}

p {
  font-size: 17px;
  line-height: 1.7;
}

.links {
  margin: 32px 0 20px;
}

.primary-link {
  display: inline-block;
  padding: 14px 22px;
  border: 2px solid #222;
  border-radius: 6px;
  color: #222;
  font-weight: 700;
  text-decoration: none;
}

.primary-link:hover,
.primary-link:focus {
  background: #222;
  color: #fff;
}

.note {
  font-size: 15px;
}

.development {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid #ddd;
  font-size: 15px;
  font-style: italic;
}

@media (max-width: 640px) {
  .hero {
    padding: 32px 24px;
  }

  h1 {
    font-size: 42px;
  }

  .tagline {
    font-size: 21px;
  }

  .intro {
    font-size: 19px;
  }
}