:root {
  --primary: #7c3aed;
  --primary-dark: #6d28d9;
  --secondary: #06b6d4;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --bg-light: #f9fafb;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--text-primary);
}

.main-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.header-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path d="M0,50 Q300,100 600,50 T1200,50 L1200,120 L0,120 Z" fill="rgba(255,255,255,0.1)"/></svg>');
  background-repeat: repeat-x;
  animation: wave 15s linear infinite;
}

@keyframes wave {
  0% { transform: translateX(0); }
  100% { transform: translateX(1200px); }
}

.header-content {
  position: relative;
  z-index: 1;
}

.main-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: -1px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  margin-bottom: 20px;
  font-weight: 500;
}

.header-accent {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, #06b6d4, #10b981);
  margin: 0 auto;
  border-radius: 2px;
}

.features-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  padding: 60px 40px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.feature-card {
  background: white;
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 35px rgba(0, 0, 0, 0.15);
}

.feature-card h2,
.feature-card h3 {
  color: var(--primary);
  margin-bottom: 15px;
  font-size: 1.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.feature-card button {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
  margin-top: 15px;
}

.feature-card button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

.feature-card button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.feature-card input,
.feature-card select {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.95rem;
  margin-bottom: 15px;
  transition: border-color 0.3s ease;
}

.feature-card input:focus,
.feature-card select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.feature-card label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.success {
  color: var(--success);
  font-weight: 600;
  margin-top: 15px;
  padding: 12px 16px;
  background: rgba(16, 185, 129, 0.1);
  border-left: 4px solid var(--success);
  border-radius: 4px;
}

.error {
  color: var(--error);
  font-weight: 600;
  margin-top: 15px;
}

.subscription-active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(6, 182, 212, 0.1));
  padding: 20px;
  border-radius: 12px;
  border: 2px solid var(--success);
}

.price {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin: 15px 0;
}

.swap-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.footer-section {
  background: rgba(0, 0, 0, 0.8);
  color: white;
  text-align: center;
  padding: 30px 20px;
  margin-top: auto;
  font-size: 0.95rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-container {
  text-align: center;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 15px;
  opacity: 0.8;
}

.feature-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 15px;
  line-height: 1.5;
}

.payment-details {
  background: rgba(124, 58, 237, 0.1);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.payment-details .amount {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 5px;
}

.payment-details .merchant {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

.subscription-pricing {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(6, 182, 212, 0.1));
  padding: 20px;
  border-radius: 12px;
  margin: 20px 0;
  border: 2px solid var(--success);
}

.subscription-pricing .price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 5px;
}

.subscription-pricing .billing-period {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  font-weight: 500;
}