* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: #222;
  background: #fafafa;
  font: 16px/1.6 Arial, sans-serif;
}

.container {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
}

header {
  padding: 20px 0;
  border-bottom: 1px solid #ddd;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  color: #222;
  font-weight: bold;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 20px;
}

nav a {
  color: #555;
  text-decoration: none;
}

section {
  padding: 72px 0;
  border-bottom: 1px solid #e5e5e5;
}

.hero {
  padding: 110px 0;
}

.label {
  color: #777;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  max-width: 700px;
  margin: 12px 0 24px;
  font-size: clamp(40px, 7vw, 72px);
}

h2 {
  font-size: 32px;
}

.lead,
section > .container > p {
  max-width: 680px;
}

.lead {
  margin-bottom: 28px;
  color: #555;
  font-size: 20px;
}

button {
  padding: 12px 18px;
  color: white;
  background: #222;
  border: 0;
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
}

button:hover {
  background: #444;
}

#js-result {
  margin-left: 12px;
  color: #237a3b;
}

.columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

article {
  padding: 20px;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
}

footer {
  padding: 32px 0;
  color: #777;
}

@media (max-width: 640px) {
  nav {
    display: none;
  }

  .hero,
  section {
    padding: 56px 0;
  }

  .columns {
    grid-template-columns: 1fr;
  }

  #js-result {
    display: block;
    margin: 12px 0 0;
  }
}