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

:root {
  --primary: #0a84ff;
  --primary-dark: #0066cc;
  --secondary: #1f1f2e;
  --light-gray: #f5f7fa;
  --gray: #8a92a2;
  --dark-gray: #2a2a3e;
  --white: #ffffff;
  --text: #1a1a1a;
  --border: #e8e8f0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background-color: var(--white);
  line-height: 1.6;
}

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

/* Navigation */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--primary);
}

.logo svg {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 14px;
  transition: color 0.3s;
}

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

/* Hero Section */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, #f5f7fa 0%, #e8f0ff 100%);
}

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

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--secondary);
  line-height: 1.2;
}

.hero p {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-size: 16px;
  transition: all 0.3s;
  display: inline-block;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 132, 255, 0.3);
}

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

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

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 12px 28px;
  font-size: 14px;
}

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

.btn-block {
  width: 100%;
}

.btn-large {
  padding: 18px 48px;
  font-size: 18px;
}

.hero-subtext {
  font-size: 14px;
  color: var(--gray);
}

/* Section Styling */
section {
  padding: 80px 0;
}

h2 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--secondary);
}

.section-subtitle {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: 48px;
  max-width: 600px;
}

/* Advantages Section */
.advantages {
  background: var(--white);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.advantage-card {
  padding: 32px;
  background: var(--light-gray);
  border-radius: 12px;
  transition: all 0.3s;
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
  background: var(--white);
}

.advantage-card .icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.advantage-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary);
}

.advantage-card p {
  color: var(--gray);
  font-size: 15px;
}

/* How to Connect */
.how-to-connect {
  background: linear-gradient(135deg, #f5f7fa 0%, #e8f0ff 100%);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
}

.step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
}

.step h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary);
}

.step p {
  color: var(--gray);
  font-size: 15px;
}

/* Secondary CTA */
.secondary-cta {
  background: var(--primary);
  padding: 60px 0;
}

.cta-box {
  text-align: center;
  color: var(--white);
}

.cta-box h2 {
  color: var(--white);
  font-size: 36px;
}

.cta-box p {
  font-size: 18px;
  margin-bottom: 32px;
  opacity: 0.9;
}

/* Devices Section */
.devices {
  background: var(--white);
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.device-card {
  padding: 32px;
  text-align: center;
  border: 2px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s;
}

.device-card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(10, 132, 255, 0.15);
}

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

.device-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--secondary);
}

.device-card p {
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 20px;
}

/* Pricing Section */
.pricing {
  background: linear-gradient(135deg, #f5f7fa 0%, #e8f0ff 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.price-card {
  background: var(--white);
  padding: 32px;
  border-radius: 12px;
  border: 2px solid var(--border);
  position: relative;
  transition: all 0.3s;
}

.price-card:hover {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

.price-card.featured {
  border-color: var(--primary);
  transform: scale(1.05);
}

.price-badge {
  display: inline-block;
  background: var(--light-gray);
  color: var(--gray);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.price-badge.featured-badge {
  background: var(--primary);
  color: var(--white);
}

.price-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--secondary);
}

.price {
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.amount {
  font-size: 42px;
  font-weight: 700;
  color: var(--primary);
}

.currency {
  font-size: 18px;
  color: var(--gray);
}

.price-note {
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 12px;
}

.discount {
  background: #fff3cd;
  color: #856404;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.features-list {
  list-style: none;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: left;
}

.features-list li {
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 12px;
}

/* FAQ Section */
.faq {
  background: var(--white);
}

.faq-grid {
  display: grid;
  gap: 16px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  padding: 24px;
  background: var(--light-gray);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  transition: background 0.3s;
}

.faq-question:hover {
  background: #eff3ff;
}

.faq-question h3 {
  font-size: 16px;
  color: var(--secondary);
  margin: 0;
}

.toggle {
  font-size: 24px;
  color: var(--primary);
  font-weight: 300;
}

.faq-answer {
  display: none;
  padding: 24px;
  background: var(--white);
  color: var(--gray);
  font-size: 15px;
}

.faq-answer.active {
  display: block;
}

.faq-item.open .faq-answer {
  display: block;
}

.faq-item.open .toggle {
  transform: rotate(45deg);
}

/* SEO Text Section */
.seo-text {
  background: var(--light-gray);
}

.seo-text h2 {
  font-size: 36px;
  margin-bottom: 24px;
}

.seo-text h3 {
  font-size: 22px;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 16px;
  color: var(--secondary);
}

.seo-text p {
  color: var(--gray);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.seo-list {
  list-style: none;
  margin: 24px 0;
}

.seo-list li {
  color: var(--gray);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
  padding-left: 24px;
  position: relative;
}

.seo-list li:before {
  content: "•";
  color: var(--primary);
  font-weight: bold;
  display: inline-block;
  width: 24px;
  position: absolute;
  left: 0;
}

/* Footer */
.footer {
  background: var(--secondary);
  color: var(--white);
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-section p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  line-height: 1.6;
}

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

.footer-section ul li {
  margin-bottom: 12px;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  h2 {
    font-size: 28px;
  }

  .nav-links {
    gap: 16px;
    font-size: 13px;
  }

  .cta-buttons {
    flex-direction: column;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .price-card.featured {
    transform: scale(1);
  }

  .steps-grid {
    gap: 32px;
  }

  section {
    padding: 60px 0;
  }

  .advantages-grid,
  .devices-grid,
  .pricing-grid {
    gap: 20px;
  }
}

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

  .hero h1 {
    font-size: 24px;
  }

  .hero p {
    font-size: 14px;
  }

  .nav-links {
    gap: 8px;
  }

  .nav-links a {
    font-size: 12px;
  }

  h2 {
    font-size: 24px;
  }

  .btn {
    padding: 10px 20px;
    font-size: 13px;
  }

  section {
    padding: 40px 0;
  }
}