* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #111;
  line-height: 1.5;
  background: #fff;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid #eee;
  padding: 18px 0;
}

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

.brand {
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
  color: #111;
}

nav a {
  margin-left: 24px;
  text-decoration: none;
  color: #555;
  font-size: 14px;
}

nav a:hover {
  color: #111;
}

main {
  padding: 96px 0 64px;
}

.hero {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero p {
  font-size: 18px;
  color: #555;
  margin-bottom: 32px;
}

.cta {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn {
  background: #111;
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
}

.btn-secondary {
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  color: #111;
  border: 1px solid #ddd;
  font-size: 15px;
}

.features {
  margin-top: 96px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.features article h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.features article p {
  color: #666;
  font-size: 15px;
}

footer {
  border-top: 1px solid #eee;
  padding: 24px 0;
  margin-top: 96px;
  color: #888;
  font-size: 13px;
  text-align: center;
}

@media (max-width: 700px) {
  .hero h1 {
    font-size: 40px;
  }
  .features {
    grid-template-columns: 1fr;
  }
  nav a {
    margin-left: 14px;
  }
}