/* Global styles */
html {
  font-family: 'Open Sans', sans-serif;
  font-size: 16px;
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

p {
  line-height: 1.5;
}

/* Buttons */
button,
input[type="submit"] {
  background-color: #3498db;
  border: none;
  color: #fff;
  padding: 1rem 2rem;
  font-size: 1.2rem;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: background-color 0.3s ease-in-out;
}

button:hover,
input[type="submit"]:hover {
  background-color: #2980b9;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

/* Responsive styles */
@media screen and (max-width: 768px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  button,
  input[type="submit"] {
    font-size: 1rem;
  }

  .container {
    max-width: 90%;
  }
}