* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: #f4f6f8;
  color: #222;
  display: flex;
  flex-direction: column;
}

header {
  width: 100%;
  padding: 16px 32px;
  background: #ffffff;
  border-bottom: 1px solid #d8dde2;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  color: #1683d8;
  font-size: 25px;
  font-weight: 800;
  text-decoration: none;
}

header nav {
  display: flex;
  align-items: center;
  gap: 5px;
}

header nav a {
  padding: 8px 12px;
  border-radius: 5px;
  color: #555;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

header nav a:hover {
  background: #eef2f5;
  color: #1683d8;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.hero {
  width: 100%;
  max-width: 720px;
  padding: 42px 35px;
  background: #ffffff;
  border: 1px solid #dfe3e7;
  border-radius: 8px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero h1 {
  margin: 0 0 12px;
  color: #1683d8;
  font-size: 40px;
  font-weight: 800;
}

.hero p {
  max-width: 540px;
  margin: 0 0 28px;
  color: #666;
  font-size: 17px;
  line-height: 1.6;
}

.banner {
  display: block;
  width: 200px;
  height: 59px;
  margin: 0 auto 24px;
}

.button {
  display: inline-block;
  padding: 11px 22px;
  border: 1px solid #1683d8;
  border-radius: 5px;
  background: #1683d8;
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: #0f70bb;
  border-color: #0f70bb;
}

footer {
  width: 100%;
  padding: 22px 20px;
  background: #ffffff;
  border-top: 1px solid #d8dde2;
  text-align: center;
}

footer nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 10px;
}

footer nav a {
  color: #777;
  font-size: 13px;
  text-decoration: none;
}

footer nav a:hover {
  color: #1683d8;
}

footer p {
  margin: 0;
  color: #aaa;
  font-size: 12px;
}

@media (max-width: 700px) {
  header {
    padding: 16px 20px;
    flex-direction: column;
    gap: 12px;
  }

  header nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  main {
    padding: 40px 15px;
  }

  .hero {
    padding: 35px 20px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .banner {
    max-width: 100%;
  }
}