/* Base styles and reset */
:root {
  --primary-color: #3498db;
  --secondary-color: #2c3e50;
  --success-color: #2ecc71;
  --danger-color: #e74c3c;
  --light-gray: #f4f6f9;
  --dark-gray: #2d3748;
  --text-color: #333;
  --white: #fff;
  --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-gray);
}

/* Layout */
header {
  background-color: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin-left: 1.5rem;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

nav a:hover {
  color: var(--primary-color);
}

nav a.active {
  color: var(--primary-color);
  font-weight: 600;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.hero {
  text-align: center;
  padding: 3rem 1rem;
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-color);
}

.content {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.content h2 {
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
  border-bottom: 2px solid var(--light-gray);
  padding-bottom: 0.5rem;
}

footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--secondary-color);
  color: var(--white);
  margin-top: 2rem;
}

/* Forms */
form {
  max-width: 600px;
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

input[type="checkbox"] + label {
  display: inline;
  margin-left: 0.5rem;
}

button {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

button:hover {
  background-color: #2980b9;
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
}

.alert-success {
  background-color: rgba(46, 204, 113, 0.2);
  border: 1px solid var(--success-color);
  color: #27ae60;
}

.alert-danger {
  background-color: rgba(231, 76, 60, 0.2);
  border: 1px solid var(--danger-color);
  color: #c0392b;
}

/* Responsive */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    padding: 1rem;
  }
  
  nav ul {
    margin-top: 1rem;
  }
  
  nav ul li {
    margin-left: 1rem;
    margin-right: 1rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  main {
    padding: 1rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

/* Focus styles for keyboard navigation */
:focus {
  outline: 3px solid var(--primary-color);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  body {
    background: var(--white);
  }
  
  nav, footer, button {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  .content {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}