/* Global Styles */
:root {
  --primary-color: #2196F3;
  --secondary-color: #03A9F4;
  --text-color: #333;
  --light-gray: #f5f5f5;
  --border-color: #ddd;
  --footer-color: #f9f9f9;
  --link-color: #0277BD;
  --hover-color: #01579B;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: white;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4 {
  margin-bottom: 1rem;
  line-height: 1.3;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.8rem;
  margin-top: 2rem;
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.4rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  color: var(--hover-color);
  text-decoration: underline;
}

ul, ol {
  margin: 1rem 0 1rem 2rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Header */
header {
  text-align: center;
  padding: 3rem 0;
  margin-bottom: 2rem;
  background-color: var(--light-gray);
  border-radius: 0 0 10px 10px;
}

.subtitle {
  font-size: 1.2rem;
  font-style: italic;
  color: #666;
  margin-bottom: 1.5rem;
}

.language-switcher {
  margin-top: 1rem;
}

.language-switcher a {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
}

.language-switcher a.active {
  background-color: var(--primary-color);
  color: white;
}

/* Main Content */
main {
  padding: 1rem 0 3rem;
}

section {
  margin-bottom: 2.5rem;
}

.img-container {
  display: flex;
  justify-content: center;
  margin: 1.5rem 0;
}

.screenshot {
  max-width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  font-weight: bold;
  margin: 1rem 0;
}

.btn:hover {
  background-color: var(--hover-color);
  text-decoration: none;
  color: white;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 0;
  background-color: var(--footer-color);
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
  border-radius: 10px 10px 0 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  header {
    padding: 2rem 0;
  }

  .container {
    padding: 0 15px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.8rem;
  }

  .btn {
    display: block;
    text-align: center;
  }
}