:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --dark: #1f2937;
  --gray: #6b7280;
  --gray-light: #9ca3af;
  --gray-lighter: #e5e7eb;
  --light: #f9fafb;
  --white: #ffffff;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--dark);
  background: var(--light);
  line-height: 1.6;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  gap: 8px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--secondary);
  color: var(--white) !important;
}

.btn-secondary:hover {
  background: #7c3aed;
  transform: translateY(-1px);
}

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

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

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

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--dark);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-lighter);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--gray-lighter);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
}

/* Header */
.header {
  background: var(--white);
  padding: 16px 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.logo-icon {
  font-size: 32px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav a {
  text-decoration: none;
  color: var(--gray);
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--white) 0%, var(--light) 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero h1 {
  font-size: 48px;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--dark);
}

.hero p {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
}

.phone-mockup {
  background: var(--dark);
  border-radius: 40px;
  padding: 12px;
  max-width: 300px;
  margin: 0 auto;
}

.phone-screen {
  background: var(--white);
  border-radius: 32px;
  padding: 40px 24px;
  text-align: center;
}

/* Stamp Grid */
.stamp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stamp {
  aspect-ratio: 1;
  border-radius: 50%;
  border: 3px dashed var(--gray-lighter);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--white);
  transition: all 0.3s;
}

.stamp.filled {
  background: var(--primary);
  border: 3px solid var(--primary);
}

.stamp-progress {
  font-weight: 600;
  color: var(--primary);
}

/* Features */
.features {
  padding: 80px 0;
  background: var(--white);
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 32px 24px;
  border-radius: var(--radius);
  background: var(--light);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--gray);
  font-size: 14px;
}

/* How it Works */
.how-it-works {
  padding: 80px 0;
  background: var(--light);
}

.how-it-works h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 48px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step p {
  color: var(--gray);
  font-size: 14px;
}

/* Pricing */
.pricing {
  padding: 80px 0;
  background: var(--white);
}

.pricing h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 12px;
}

.pricing-subtitle {
  text-align: center;
  color: var(--gray);
  margin-bottom: 48px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--light);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  background: var(--primary);
  color: var(--white);
  transform: scale(1.05);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--white);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.pricing-header {
  margin-bottom: 24px;
}

.pricing-header h3 {
  font-size: 20px;
  margin-bottom: 16px;
}

.pricing-amount {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-amount .currency {
  font-size: 20px;
  font-weight: 600;
}

.pricing-amount .price {
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
}

.pricing-amount .period {
  font-size: 14px;
  color: var(--gray);
}

.pricing-card.featured .pricing-amount .period {
  color: rgba(255, 255, 255, 0.7);
}

.pricing-save {
  font-size: 14px;
  color: var(--secondary);
  margin-top: 8px;
}

.pricing-card.featured .pricing-save {
  color: #a7f3d0;
}

.pricing-features {
  list-style: none;
  margin-bottom: 24px;
  text-align: left;
}

.pricing-features li {
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-lighter);
  font-size: 14px;
}

.pricing-card.featured .pricing-features li {
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.pricing-card .btn-outline {
  border-color: var(--primary);
  color: var(--primary);
}

.pricing-card .btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}

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

.pricing-card.featured .btn-primary:hover {
  background: var(--light);
}

/* Footer */
.footer {
  background: var(--dark);
  color: var(--gray-light);
  padding: 32px 0;
  text-align: center;
}

/* Alerts */
.alert {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.alert-success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.alert-error {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.alert-warning {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-lighter);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: transform 0.3s;
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--gray);
}

/* Responsive */
@media (max-width: 768px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero-buttons {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .features-grid,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: none;
    order: -1;
  }
  
  .nav {
    display: none;
  }
}

@media (max-width: 480px) {
  .features-grid,
  .steps {
    grid-template-columns: 1fr;
  }
  
  .stamp-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }
}