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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1a1a1a;
  background: #ffffff;
  line-height: 1.6;
}

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

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

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

/* Navigation */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid #e5e5e5;
  position: sticky;
  top: 0;
  z-index: 100;
  animation: slideDown 0.3s ease-out;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: #2563eb;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 24px;
  height: 24px;
}

.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: #666;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: #2563eb;
}

.nav-links a.active {
  color: #2563eb;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: #2563eb;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #f8f9fa 0%, #f0f4f8 100%);
  padding: 80px 20px;
  text-align: center;
}

.hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: #e0e7ff;
  color: #2563eb;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  color: #1a1a1a;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 18px;
  color: #666;
  margin-bottom: 32px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.stat-item {
  padding: 20px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 8px;
  border: 1px solid #e5e5e5;
}

.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Buttons */
.btn {
  padding: 12px 28px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-primary {
  background: #2563eb;
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.2);
}

.btn-outline {
  background: transparent;
  color: #2563eb;
  border: 1px solid #2563eb;
}

.btn-outline:hover:not(:disabled) {
  background: #f0f4f8;
}

.btn-white {
  background: white;
  color: #2563eb;
  border: 1px solid #e5e5e5;
}

.btn-white:hover:not(:disabled) {
  border-color: #2563eb;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* Sections */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

.section-alt {
  background: #f8f9fa;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-badge {
  display: inline-block;
  background: #e0e7ff;
  color: #2563eb;
  padding: 6px 12px;
  border-radius: 16px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: #1a1a1a;
  margin-bottom: 12px;
}

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

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.feature-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: #2563eb;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.1);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  padding: 12px;
  background: #e0e7ff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: #2563eb;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

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

/* Platform Grid */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.platform-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 28px 20px;
  text-align: center;
  transition: all 0.3s ease;
}

.platform-card:hover {
  border-color: #2563eb;
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.1);
}

.platform-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  padding: 8px;
  background: #f0f4f8;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 24px;
  height: 24px;
  color: #2563eb;
}

.platform-name {
  font-size: 16px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 4px;
}

.platform-desc {
  font-size: 12px;
  color: #999;
  margin-bottom: 16px;
}

/* Comparison Table */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  overflow: hidden;
}

.comparison-table th {
  background: #f8f9fa;
  padding: 16px;
  text-align: left;
  font-weight: 700;
  font-size: 14px;
  color: #1a1a1a;
  border-bottom: 1px solid #e5e5e5;
}

.comparison-table td {
  padding: 14px 16px;
  border-bottom: 1px solid #e5e5e5;
  font-size: 14px;
  color: #666;
}

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

.comparison-table .highlight {
  color: #2563eb;
  font-weight: 600;
}

/* FAQ Section */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active {
  border-color: #2563eb;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.faq-q {
  padding: 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #1a1a1a;
  user-select: none;
  transition: background 0.3s ease;
}

.faq-item:hover .faq-q {
  background: #f8f9fa;
}

.faq-q::after {
  content: '▼';
  font-size: 12px;
  color: #2563eb;
  transition: transform 0.3s ease;
  margin-left: 12px;
}

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

.faq-a {
  padding: 0 16px 16px;
  color: #666;
  font-size: 14px;
  line-height: 1.6;
  display: none;
}

.faq-item.active .faq-a {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.review-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 24px;
}

.review-header {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.review-info {
  flex: 1;
}

.review-name {
  font-weight: 700;
  color: #1a1a1a;
  font-size: 14px;
  margin-bottom: 2px;
}

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

.review-stars {
  color: #fbbf24;
  font-size: 12px;
  margin-bottom: 8px;
}

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

/* Download Section */
.download-hero {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: white;
  padding: 60px 20px;
  text-align: center;
}

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

.download-title {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-subtitle {
  font-size: 16px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.download-main {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 32px;
}

.download-main-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.download-meta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
  font-size: 13px;
  opacity: 0.9;
}

.download-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Guide Steps */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.step-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 24px;
  text-align: center;
}

.step-number {
  width: 40px;
  height: 40px;
  background: #2563eb;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  margin: 0 auto 12px;
}

.step-title {
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
  font-size: 15px;
}

.step-desc {
  font-size: 13px;
  color: #666;
  line-height: 1.5;
}

/* Version Timeline */
.version-timeline {
  max-width: 600px;
  margin: 0 auto;
}

.version-item {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
  position: relative;
}

.version-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 19px;
  top: 40px;
  width: 2px;
  height: calc(100% + 4px);
  background: #e5e5e5;
}

.version-dot {
  width: 40px;
  height: 40px;
  background: #2563eb;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.version-content {
  flex: 1;
  padding-top: 4px;
}

.version-header {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 4px;
}

.version-tag {
  background: #e0e7ff;
  color: #2563eb;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.version-date {
  font-size: 12px;
  color: #999;
}

.version-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.5;
}

/* Article Section */
.article-hero {
  background: linear-gradient(135deg, #f8f9fa 0%, #f0f4f8 100%);
  padding: 60px 20px;
  text-align: center;
}

.article-hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.article-title {
  font-size: 42px;
  font-weight: 800;
  color: #1a1a1a;
  margin-bottom: 16px;
}

.article-subtitle {
  font-size: 16px;
  color: #666;
  margin-bottom: 24px;
}

.tag-cloud {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.tag {
  background: white;
  border: 1px solid #e5e5e5;
  color: #2563eb;
  padding: 6px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.tag:hover {
  background: #e0e7ff;
  border-color: #2563eb;
}

/* Article Layout */
.article-layout {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-body {
  font-size: 15px;
  color: #666;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1a1a1a;
  margin: 32px 0 16px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul {
  margin-left: 20px;
  margin-bottom: 16px;
}

.article-body li {
  margin-bottom: 8px;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-box {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 20px;
}

.sidebar-title {
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
  font-size: 14px;
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-links a {
  color: #2563eb;
  text-decoration: none;
  font-size: 13px;
  transition: color 0.3s ease;
}

.sidebar-links a:hover {
  color: #1d4ed8;
}

.sidebar-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-stat {
  padding: 12px;
  background: #f8f9fa;
  border-radius: 6px;
  text-align: center;
}

.sidebar-stat-num {
  font-size: 20px;
  font-weight: 700;
  color: #2563eb;
}

.sidebar-stat-label {
  font-size: 11px;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: white;
  padding: 40px 20px;
  text-align: center;
  border-radius: 8px;
  margin: 40px 0;
}

.cta-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-desc {
  font-size: 14px;
  opacity: 0.9;
  margin-bottom: 20px;
}

/* Footer */
.site-footer {
  background: #1a1a1a;
  color: white;
  padding: 40px 20px;
  text-align: center;
  font-size: 13px;
  line-height: 1.8;
}

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

.footer-brand {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #2563eb;
}

.security-notice {
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  padding: 12px;
  border-radius: 6px;
  margin: 16px 0;
  font-size: 12px;
  color: #e0e7ff;
}

.footer-text {
  opacity: 0.7;
  margin-top: 12px;
}

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

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

  .nav-links {
    gap: 16px;
  }

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

  .article-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: -1;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }

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

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }

  .section-title {
    font-size: 22px;
  }

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

  .hero-stats {
    grid-template-columns: 1fr;
  }
}