:root {
  --primary-color: #5B4CFF;
  --primary-dark: #4839CC;
  --secondary-color: #10B981;
  --text-dark: #1F2937;
  --text-gray: #6B7280;
  --bg-light: #F9FAFB;
  --border-color: #E5E7EB;
  --white: #FFFFFF;
  --error-color: #EF4444;
  --success-color: #10B981;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--white);
}

/* Header */
header {
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s;
}

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

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary-color);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(91, 76, 255, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: var(--white);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-disabled:hover {
  transform: none;
  box-shadow: none;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Hero Section */
.hero {
  padding: 5rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--white);
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  font-weight: 800;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

/* Features Section */
.features {
  padding: 5rem 2rem;
  background: var(--bg-light);
}

.features h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-gray);
}

/* Pricing Section */
.pricing {
  padding: 5rem 2rem;
}

.pricing h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--white);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
  transition: all 0.3s;
}

.pricing-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 8px 24px rgba(91, 76, 255, 0.15);
  transform: translateY(-5px);
}

.pricing-card.featured {
  border-color: var(--primary-color);
  box-shadow: 0 8px 24px rgba(91, 76, 255, 0.2);
}

.badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-color);
  color: var(--white);
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin: 1rem 0;
}

.price span {
  font-size: 1rem;
  color: var(--text-gray);
  font-weight: 400;
}

.features-list {
  list-style: none;
  margin: 1.5rem 0;
}

.features-list li {
  padding: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.features-list li::before {
  content: '✓';
  color: var(--success-color);
  font-weight: 700;
  font-size: 1.2rem;
}

/* Sign-Up Wizard */
.wizard-container {
  max-width: 600px;
  margin: 3rem auto;
  padding: 2rem;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.progress-bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2rem;
  position: relative;
}

.progress-bar::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--border-color);
  z-index: -1;
}

.progress-step {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  transition: all 0.3s;
}

.progress-step.active {
  background: var(--primary-color);
  color: var(--white);
}

.progress-step.completed {
  background: var(--success-color);
  color: var(--white);
}

.wizard-step {
  display: none;
}

.wizard-step.active {
  display: block;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-error {
  color: var(--error-color);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.radio-group,
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.radio-option,
.checkbox-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
}

.radio-option:hover,
.checkbox-option:hover {
  border-color: var(--primary-color);
  background: rgba(91, 76, 255, 0.05);
}

.radio-option.selected,
.checkbox-option.selected {
  border-color: var(--primary-color);
  background: rgba(91, 76, 255, 0.1);
}

.wizard-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}

/* Footer */
footer {
  background: var(--text-dark);
  color: var(--white);
  padding: 3rem 2rem;
  margin-top: 5rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  text-align: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Alert Messages */
.alert {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.alert-success {
  background: #D1FAE5;
  color: #065F46;
  border: 1px solid #10B981;
}

.alert-error {
  background: #FEE2E2;
  color: #991B1B;
  border: 1px solid #EF4444;
}

.alert-info {
  background: #DBEAFE;
  color: #1E40AF;
  border: 1px solid #3B82F6;
}

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

  .hero p {
    font-size: 1rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .nav-links {
    gap: 1rem;
  }

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

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

  .wizard-container {
    padding: 1rem;
  }
}