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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #333;
  padding: 20px;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
  font-size: 2.5em;
  margin-bottom: 20px;
  color: #667eea;
  text-align: center;
}

h2 {
  font-size: 1.8em;
  margin: 30px 0 15px;
  color: #764ba2;
}

h3 {
  font-size: 1.2em;
  margin-bottom: 8px;
  color: #333;
}

p {
  line-height: 1.6;
  margin-bottom: 15px;
  font-size: 1.1em;
}

code {
  background: #f5f5f5;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
  color: #e83e8c;
}

.info-box {
  background: #f8f9fa;
  border-left: 4px solid #667eea;
  padding: 20px;
  margin: 25px 0;
  border-radius: 8px;
}

.info-box ul {
  margin-left: 20px;
  margin-top: 10px;
}

.info-box li {
  margin: 8px 0;
  line-height: 1.6;
}

.features {
  margin: 30px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.feature-card {
  background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
  border: 2px solid #667eea30;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

.feature-card .icon {
  font-size: 3em;
  display: block;
  margin-bottom: 10px;
}

.feature-card h3 {
  margin-bottom: 10px;
  color: #667eea;
}

.feature-card p {
  font-size: 0.95em;
  color: #666;
  margin: 0;
}

.demo-section {
  background: #fff5f5;
  border: 2px solid #764ba2;
  border-radius: 12px;
  padding: 30px;
  margin-top: 30px;
  text-align: center;
}

.demo-button {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 15px 40px;
  font-size: 1.1em;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
  margin-top: 15px;
}

.demo-button:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.demo-button:active {
  transform: scale(0.98);
}

.result {
  display: none;
  margin-top: 20px;
  padding: 15px;
  background: #d4edda;
  border: 1px solid #c3e6cb;
  border-radius: 8px;
  color: #155724;
  font-weight: 600;
  font-size: 1.1em;
}

@media (max-width: 768px) {
  .container {
    padding: 20px;
  }

  h1 {
    font-size: 2em;
  }

  h2 {
    font-size: 1.5em;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}