/* Reset and layout foundation */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  font-family: 'Segoe UI', sans-serif;
  color: #333;
  background-color: #f9f9f9;
  text-align: center;
}

/* Layout container */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Header */
header {
  padding: 20px 0;
}

header img {
  max-width: 240px;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* Main content */
.intro {
  max-width: 800px;
  margin: 30px auto 0;
  padding: 0 10px;
}

h1 {
  font-size: 3em;
  margin-bottom: 10px;
  color: #2c3e50;
}

h2 {
  font-size: 1.5em;
  margin-bottom: 20px;
  color: #7f8c8d;
}

p {
  font-size: 1.1em;
  line-height: 1.6;
  margin: 0 auto 20px;
}

/* Footer */
footer {
  margin-top: auto;
  font-size: 0.9em;
  color: #aaa;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
  h1 {
    font-size: 2em;
  }

  p {
    font-size: 1em;
    max-width: 100%;
  }

  header img {
    max-width: 220px;
    max-height: none;
  }

  .container {
    padding: 20px 10px;
  }
}