* {
  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: #1e293b;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

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

/* Topbar - Đồng bộ với products */
.topbar {
  background: #111827;
  color: #fff;
  padding: 16px 0;
}

.topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.topbar h1 {
  font-size: 1.5rem;
  color: #fff;
  font-weight: 700;
  margin: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  color: #fff;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  background: rgba(255, 255, 255, 0.1);
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

/* Hero Header */
.hero-header {
  background: rgba(255, 255, 255, 0.95);
  padding: 40px 0;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 40px;
}

.logo {
  text-align: center;
}

.logo h1 {
  font-size: 2.5rem;
  color: #1e293b;
  margin-bottom: 10px;
  font-weight: 700;
}

.tagline {
  font-size: 1.2rem;
  color: #64748b;
  font-weight: 400;
}

/* Features Section */
.features-section {
  background: rgba(255, 255, 255, 0.95);
  padding: 60px 40px;
  border-radius: 20px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.features-section h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 40px;
  color: #1e293b;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  padding: 30px;
  border-radius: 15px;
  border: 1px solid #e2e8f0;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #667eea;
}

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

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: #1e293b;
}

.feature-card p {
  color: #64748b;
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  margin-bottom: 40px;
}

.cta-card {
  background: rgba(255, 255, 255, 0.95);
  padding: 60px 40px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.cta-card h2 {
  font-size: 2.2rem;
  margin-bottom: 15px;
  color: #1e293b;
}

.cta-description {
  font-size: 1.1rem;
  color: #64748b;
  margin-bottom: 40px;
}

.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 30px 40px;
  border-radius: 15px;
  text-decoration: none;
  transition: all 0.3s ease;
  min-width: 280px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
}

.btn-secondary:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-icon {
  font-size: 3rem;
  margin-bottom: 15px;
  display: block;
}

.btn-text {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.btn-subtitle {
  font-size: 0.95rem;
  opacity: 0.9;
  font-weight: 400;
}

/* How it works */
.how-it-works {
  background: rgba(255, 255, 255, 0.95);
  padding: 60px 40px;
  border-radius: 20px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.how-it-works h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 40px;
  color: #1e293b;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.step {
  text-align: center;
  padding: 20px;
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: bold;
  margin: 0 auto 20px;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.step h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: #1e293b;
}

.step p {
  color: #64748b;
  line-height: 1.6;
}

/* Footer */
/* Footer */
.footer {
  background: rgba(255, 255, 255, 0.95);
  padding: 30px 0;
  text-align: center;
  color: #64748b;
  margin-top: 40px;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.footer-text {
  font-size: 1rem;
  margin-bottom: 12px;
  color: #475569;
}

.footer-bank {
  font-size: 1.1rem;
  color: #1e293b;
  font-weight: 500;
}

.footer-bank strong {
  color: #2563eb;
  font-size: 1.2rem;
  font-weight: 700;
}

/* Responsive */
@media (max-width: 768px) {
  .topbar .container {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  
  .topbar h1 {
    font-size: 1.3rem;
  }
  
  .nav-menu {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
  }
  
  .logo h1 {
    font-size: 1.8rem;
  }
  
  .tagline {
    font-size: 1rem;
  }
  
  .hero-header {
    padding: 30px 0;
  }
  
  .features-section,
  .cta-card,
  .how-it-works {
    padding: 40px 20px;
  }
  
  .features-section h2,
  .cta-card h2,
  .how-it-works h2 {
    font-size: 1.6rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .feature-card {
    padding: 20px;
  }
  
  .feature-icon {
    font-size: 2.5rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    min-width: auto;
    width: 100%;
    padding: 25px 30px;
  }
  
  .btn-icon {
    font-size: 2.5rem;
  }
  
  .btn-text {
    font-size: 1.2rem;
  }
  
  .steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .step-number {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }
  
  .topbar {
    padding: 12px 0;
  }
  
  .topbar h1 {
    font-size: 1.1rem;
  }
  
  .nav-link {
    padding: 10px 16px;
    font-size: 13px;
  }
  
  .features-section,
  .cta-card,
  .how-it-works {
    padding: 30px 15px;
    border-radius: 15px;
  }
  
  .feature-card {
    padding: 15px;
  }
  
  .cta-card h2 {
    font-size: 1.4rem;
  }
  
  .cta-description {
    font-size: 1rem;
  }
  
  .btn {
    padding: 20px 25px;
  }
  
  .btn-text {
    font-size: 1.1rem;
  }
  
  .btn-subtitle {
    font-size: 0.85rem;
  }
}