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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fff;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #eee;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-brand {
  font-size: 24px;
  font-weight: 700;
  color: #e74c3c;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand svg {
  width: 32px;
  height: 32px;
}

.nav-menu {
  display: flex;
  gap: 30px;
  align-items: center;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: #666;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s ease;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 6px;
}

.nav-link:hover {
  color: #e74c3c;
}

.nav-link.active {
  color: #fff;
  background: #e74c3c;
}

.nav-dl-btn {
  background: #e74c3c;
  color: #fff;
  padding: 10px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

.nav-dl-btn:hover {
  background: #c0392b;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .nav-container {
    height: 60px;
  }
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #f5f5f5 0%, #fafafa 100%);
  padding: 80px 20px;
  text-align: center;
}

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

.hero-tag {
  display: inline-block;
  background: #fff3cd;
  color: #856404;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  color: #222;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

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

.btn-primary {
  background: #e74c3c;
  color: #fff;
}

.btn-primary:hover {
  background: #c0392b;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(231, 76, 60, 0.3);
}

.btn-secondary {
  background: #f0f0f0;
  color: #333;
  border: 2px solid #ddd;
}

.btn-secondary:hover {
  background: #e8e8e8;
  border-color: #e74c3c;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.stat-item {
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: #e74c3c;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: #666;
}

/* Features Section */
.features {
  padding: 80px 20px;
  background: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: #222;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.feature-card {
  padding: 30px;
  background: #f9f9f9;
  border-radius: 12px;
  border-left: 4px solid #e74c3c;
  transition: all 0.3s ease;
}

.feature-card:hover {
  background: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: #e74c3c;
}

.feature-name {
  font-size: 18px;
  font-weight: 600;
  color: #222;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

.feature-detail {
  max-width: 1200px;
  margin: 0 auto 60px;
  padding: 40px;
  background: #f5f5f5;
  border-radius: 12px;
}

.feature-detail-title {
  font-size: 24px;
  font-weight: 700;
  color: #222;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.feature-detail-icon {
  width: 32px;
  height: 32px;
  color: #e74c3c;
}

.feature-detail-text {
  font-size: 15px;
  color: #555;
  line-height: 1.8;
  margin-bottom: 16px;
}

.feature-detail-list {
  list-style: none;
  margin-top: 16px;
}

.feature-detail-list li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  font-size: 14px;
  color: #666;
}

.feature-detail-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #e74c3c;
  font-weight: bold;
}

/* Platforms Section */
.platforms {
  padding: 80px 20px;
  background: #fafafa;
}

.platforms-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.platform-card {
  padding: 30px;
  background: #fff;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.platform-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  color: #e74c3c;
}

.platform-name {
  font-size: 20px;
  font-weight: 700;
  color: #222;
  margin-bottom: 12px;
}

.platform-info {
  font-size: 13px;
  color: #999;
  margin-bottom: 20px;
  line-height: 1.6;
}

.platform-btn {
  background: #e74c3c;
  color: #fff;
  padding: 12px 24px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease;
  width: 100%;
}

.platform-btn:hover {
  background: #c0392b;
}

/* Reviews Section */
.reviews {
  padding: 80px 20px;
  background: #fff;
}

.reviews-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.review-card {
  padding: 30px;
  background: #f9f9f9;
  border-radius: 12px;
  border-top: 3px solid #e74c3c;
}

.review-stars {
  color: #ffc107;
  font-size: 14px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 14px;
  color: #666;
  margin-bottom: 16px;
  line-height: 1.6;
  font-style: italic;
}

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

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.review-name {
  font-size: 14px;
  font-weight: 600;
  color: #222;
}

.review-role {
  font-size: 12px;
  color: #999;
}

/* Security Section */
.security {
  padding: 80px 20px;
  background: #f5f5f5;
}

.security-content {
  max-width: 1200px;
  margin: 0 auto;
}

.security-intro {
  font-size: 16px;
  color: #555;
  margin-bottom: 40px;
  line-height: 1.8;
}

.security-badges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.badge-item {
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.badge-icon {
  width: 48px;
  height: 48px;
  color: #e74c3c;
  flex-shrink: 0;
}

.badge-text {
  flex: 1;
}

.badge-title {
  font-size: 14px;
  font-weight: 600;
  color: #222;
  margin-bottom: 4px;
}

.badge-desc {
  font-size: 12px;
  color: #999;
}

.comparison-table {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  margin-top: 40px;
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
}

.comparison-table th {
  background: #f0f0f0;
  padding: 16px;
  text-align: left;
  font-weight: 600;
  color: #222;
  border-bottom: 2px solid #ddd;
}

.comparison-table td {
  padding: 16px;
  border-bottom: 1px solid #eee;
  font-size: 14px;
  color: #666;
}

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

.comparison-table .check {
  color: #27ae60;
  font-weight: 700;
}

.comparison-table .cross {
  color: #e74c3c;
  font-weight: 700;
}

/* Versions Section */
.versions {
  padding: 80px 20px;
  background: #fff;
}

.versions-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.version-card {
  padding: 40px;
  background: #f9f9f9;
  border-radius: 12px;
  border: 2px solid #eee;
  transition: all 0.3s ease;
  position: relative;
}

.version-card.featured {
  border-color: #e74c3c;
  background: #fff;
  box-shadow: 0 8px 24px rgba(231, 76, 60, 0.15);
  transform: scale(1.05);
}

.version-badge {
  display: inline-block;
  background: #e74c3c;
  color: #fff;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.version-name {
  font-size: 24px;
  font-weight: 700;
  color: #222;
  margin-bottom: 12px;
}

.version-price {
  font-size: 28px;
  font-weight: 700;
  color: #e74c3c;
  margin-bottom: 20px;
}

.version-features {
  list-style: none;
  margin-bottom: 30px;
}

.version-features li {
  padding: 10px 0;
  padding-left: 28px;
  position: relative;
  font-size: 14px;
  color: #666;
}

.version-features li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #e74c3c;
  font-weight: bold;
}

.version-btn {
  background: #e74c3c;
  color: #fff;
  padding: 12px 24px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease;
  width: 100%;
}

.version-btn:hover {
  background: #c0392b;
}

/* FAQ Section */
.faq {
  padding: 80px 20px;
  background: #fafafa;
}

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

.faq-list {
  list-style: none;
}

.faq-item {
  margin-bottom: 16px;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.faq-q {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #222;
  font-size: 15px;
  transition: background 0.3s ease;
  user-select: none;
}

.faq-q:hover {
  background: #f5f5f5;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
  color: #e74c3c;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: #fafafa;
}

.faq-item.open .faq-a {
  max-height: 500px;
}

.faq-a-inner {
  padding: 20px;
  font-size: 14px;
  color: #666;
  line-height: 1.8;
}

/* Footer */
.footer {
  background: #222;
  color: #999;
  padding: 40px 20px;
  text-align: center;
  font-size: 13px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-text {
  margin-bottom: 12px;
}

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

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

  .section-title {
    font-size: 28px;
  }

  .features-grid,
  .platforms-grid,
  .reviews-grid,
  .versions-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .feature-detail {
    padding: 24px;
  }

  .comparison-table {
    overflow-x: auto;
  }

  .comparison-table table {
    min-width: 500px;
  }
}