* {
  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: #202124;
  background: #fff;
}

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

header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  color: #202124;
  text-decoration: none;
}

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

.nav-links a {
  color: #5f6368;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 4px;
  transition: all 0.2s;
}

.nav-links a:hover {
  background: #f1f3f4;
  color: #202124;
}

.nav-links a.active {
  color: #1a73e8;
  background: #e8f0fe;
}

.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 20px;
  margin-bottom: 40px;
  opacity: 0.95;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn-primary {
  background: #fff;
  color: #667eea;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.btn-secondary {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 2px solid #fff;
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.3);
}

.btn-download {
  background: #1a73e8;
  color: #fff;
  padding: 16px 40px;
  font-size: 18px;
}

.btn-download:hover {
  background: #1557b0;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26,115,232,0.3);
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #202124;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: #5f6368;
  margin-bottom: 60px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-top: 60px;
}

.feature-card {
  text-align: center;
  padding: 32px 24px;
  border-radius: 12px;
  background: #f8f9fa;
  transition: all 0.3s;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.1);
  background: #fff;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 12px;
  color: #202124;
}

.feature-card p {
  color: #5f6368;
  font-size: 15px;
  line-height: 1.6;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  margin-top: 60px;
}

.download-card {
  background: #fff;
  border: 2px solid #e8eaed;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s;
}

.download-card:hover {
  border-color: #1a73e8;
  box-shadow: 0 8px 16px rgba(26,115,232,0.1);
}

.platform-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
}

.download-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: #202124;
}

.download-card p {
  color: #5f6368;
  font-size: 14px;
  margin-bottom: 24px;
}

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

.faq-item {
  background: #fff;
  border: 1px solid #e8eaed;
  border-radius: 8px;
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: #fff;
  border: none;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  color: #202124;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover {
  background: #f8f9fa;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

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

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

.faq-answer-content {
  padding: 0 24px 20px;
  color: #5f6368;
  line-height: 1.7;
}

.testimonials {
  background: #f8f9fa;
}

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

.testimonial-card {
  background: #fff;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.testimonial-text {
  font-size: 16px;
  color: #5f6368;
  margin-bottom: 20px;
  line-height: 1.7;
  font-style: italic;
}

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

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}

.author-info h4 {
  font-size: 15px;
  color: #202124;
  margin-bottom: 2px;
}

.author-info p {
  font-size: 13px;
  color: #5f6368;
}

.cta-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  text-align: center;
  padding: 80px 20px;
}

.cta-section h2 {
  font-size: 40px;
  margin-bottom: 20px;
}

.cta-section p {
  font-size: 18px;
  margin-bottom: 40px;
  opacity: 0.95;
}

footer {
  background: #f8f9fa;
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid #e8eaed;
}

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

.footer-security {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
  color: #1a73e8;
  font-weight: 600;
  font-size: 15px;
}

.footer-security svg {
  width: 20px;
  height: 20px;
}

.footer-copyright {
  color: #5f6368;
  font-size: 14px;
  line-height: 1.6;
}

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

.content-section h2 {
  font-size: 32px;
  margin-top: 48px;
  margin-bottom: 20px;
  color: #202124;
}

.content-section h3 {
  font-size: 24px;
  margin-top: 32px;
  margin-bottom: 16px;
  color: #202124;
}

.content-section p {
  font-size: 16px;
  line-height: 1.8;
  color: #5f6368;
  margin-bottom: 16px;
}

.content-section ul {
  margin: 20px 0;
  padding-left: 24px;
}

.content-section li {
  font-size: 16px;
  line-height: 1.8;
  color: #5f6368;
  margin-bottom: 12px;
}

.highlight-box {
  background: #e8f0fe;
  border-left: 4px solid #1a73e8;
  padding: 24px;
  border-radius: 8px;
  margin: 32px 0;
}

.highlight-box p {
  color: #202124;
  margin: 0;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border-radius: 8px;
  overflow: hidden;
}

.comparison-table th {
  background: #f8f9fa;
  padding: 16px;
  text-align: left;
  font-weight: 600;
  color: #202124;
  border-bottom: 2px solid #e8eaed;
}

.comparison-table td {
  padding: 16px;
  border-bottom: 1px solid #e8eaed;
  color: #5f6368;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
  }
  
  .nav-links a {
    font-size: 14px;
    padding: 6px 8px;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .features-grid,
  .download-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }
}