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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  background-color: #2c3e50;
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
  transition: opacity 0.3s;
}

.nav-links a:hover {
  opacity: 0.8;
}

/* Buttons */
.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: #3498db;
  color: white;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

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

.button.secondary {
  background-color: #95a5a6;
}

.button.secondary:hover {
  background-color: #7f8c8d;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.auth-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.feature {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  text-align: center;
}

.feature h3 {
  margin-bottom: 1rem;
  color: #2c3e50;
}

/* Auth Container */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 200px);
  padding: 2rem 0;
}

.auth-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 400px;
}

.auth-card h1 {
  margin-bottom: 1.5rem;
  text-align: center;
  color: #2c3e50;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #2c3e50;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #3498db;
}

.form-group button {
  width: 100%;
}

.form-links {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.form-links a {
  color: #3498db;
  text-decoration: none;
}

.form-links a:hover {
  text-decoration: underline;
}

/* Profile */
.profile-container {
  padding: 2rem 0;
}

.profile-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  max-width: 600px;
  margin: 0 auto;
}

.profile-info {
  margin: 2rem 0;
}

.info-item {
  display: flex;
  padding: 1rem 0;
  border-bottom: 1px solid #eee;
}

.info-item label {
  font-weight: 600;
  width: 150px;
  color: #2c3e50;
}

.info-item span {
  flex: 1;
}

.profile-actions {
  margin-top: 2rem;
}

/* Settings */
.settings-container {
  padding: 2rem 0;
}

.settings-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  max-width: 600px;
  margin: 0 auto;
}

.settings-section {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #eee;
}

.settings-section:last-child {
  border-bottom: none;
}

.settings-section h2 {
  margin-bottom: 1.5rem;
  color: #2c3e50;
}

/* Page Container */
.page-container {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin: 2rem 0;
}

.page-container h1 {
  margin-bottom: 1.5rem;
  color: #2c3e50;
}

.page-container h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #34495e;
}

.page-container ul {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.page-container li {
  margin-bottom: 0.5rem;
}

/* Footer */
.footer {
  background-color: #2c3e50;
  color: white;
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
}

/* Utility Classes */
.hidden {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .features {
    grid-template-columns: 1fr;
  }
  
  .auth-buttons {
    flex-direction: column;
  }
}