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

:root {
  --primary: #7c3aed;
  --primary-dark: #6d28d9;
  --primary-light: #a78bfa;
  --secondary: #3b82f6;
  --background: #ffffff;
  --surface: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --success: #10b981;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica", "Arial", sans-serif;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 16px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: color 0.2s;
}

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

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-primary-small,
.btn-device {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

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

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

.btn-primary-small {
  padding: 10px 20px;
  font-size: 14px;
  background: var(--primary);
  color: white;
}

.btn-device {
  background: var(--primary);
  color: white;
  padding: 12px 24px;
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 80px 0 100px;
  background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, #7c3aed 0%, #a78bfa 100%);
  color: white;
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 20px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  margin-bottom: 16px;
}

.hero-note {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Section Title */
.section-title {
  font-size: 40px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  color: var(--text-primary);
}

/* Advantages Section */
.advantages {
  padding: 100px 0;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
}

.advantage-card {
  padding: 32px;
  background: var(--surface);
  border-radius: 16px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.advantage-icon {
  margin-bottom: 20px;
}

.advantage-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.advantage-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* How To Section */
.how-to {
  padding: 100px 0;
  background: var(--surface);
}

.steps {
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 32px;
  margin-bottom: 48px;
}

.step:last-child {
  margin-bottom: 0;
}

.step-number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.step-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  padding: 100px 0;
}

.cta-card {
  background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
  border-radius: 24px;
  padding: 60px 40px;
  text-align: center;
  color: white;
}

.cta-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.cta-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-text {
  font-size: 18px;
  margin-bottom: 32px;
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-note {
  margin-top: 16px;
  font-size: 14px;
  opacity: 0.9;
}

/* Pricing Section */
.pricing {
  padding: 100px 0;
  background: var(--surface);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-card {
  background: white;
  border: 2px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.pricing-popular {
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.pricing-badge-best {
  background: var(--success);
}

.pricing-header {
  text-align: center;
  margin-bottom: 32px;
}

.pricing-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

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

.price {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary);
}

.period {
  font-size: 18px;
  color: var(--text-secondary);
}

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

.pricing-save {
  display: inline-block;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 8px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 12px 0;
  font-size: 15px;
  color: var(--text-secondary);
  position: relative;
  padding-left: 28px;
}

.pricing-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
  font-size: 18px;
}

/* Devices Section */
.devices {
  padding: 100px 0;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.device-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 40px 32px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.device-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.device-icon {
  margin-bottom: 24px;
}

.device-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.device-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* FAQ Section */
.faq {
  padding: 100px 0;
  background: var(--surface);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  padding: 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover {
  background: var(--surface);
}

.faq-icon {
  font-size: 24px;
  color: var(--primary);
  transition: transform 0.3s;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 24px 24px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Additional Info Section */
.additional-info {
  padding: 100px 0;
  background: white;
}

.info-content {
  max-width: 900px;
  margin: 0 auto;
}

.info-block {
  margin-bottom: 56px;
}

.info-block:last-child {
  margin-bottom: 0;
}

.info-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

.info-text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Footer */
.footer {
  padding: 60px 0;
  background: var(--text-primary);
  color: white;
}

.footer-content {
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo-text {
  font-size: 20px;
  font-weight: 700;
}

.footer-text {
  font-size: 14px;
  opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .section-title {
    font-size: 32px;
    margin-bottom: 40px;
  }

  .advantages-grid,
  .devices-grid {
    grid-template-columns: 1fr;
  }

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

  .step {
    flex-direction: column;
    gap: 16px;
  }

  .cta-title {
    font-size: 32px;
  }

  .cta-card {
    padding: 40px 24px;
  }

  .info-title {
    font-size: 26px;
  }

  .info-text {
    font-size: 16px;
  }

  .info-block {
    margin-bottom: 40px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 60px 0 80px;
  }

  .hero-title {
    font-size: 32px;
  }

  .advantages,
  .how-to,
  .pricing,
  .devices,
  .faq,
  .cta-section {
    padding: 60px 0;
  }

  .additional-info {
    padding: 60px 0;
  }

  .info-title {
    font-size: 24px;
  }

  .info-text {
    font-size: 15px;
  }
}