/* === Site 1: Clean & Simple - Secure Download Center === */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --secondary: #34a853;
  --accent: #fbbc04;
  --danger: #ea4335;
  --text: #202124;
  --text-light: #5f6368;
  --bg: #ffffff;
  --bg-light: #f8f9fa;
  --bg-card: #ffffff;
  --border: #dadce0;
  --shadow: 0 1px 2px rgba(60,64,67,0.1), 0 2px 6px rgba(60,64,67,0.08);
  --shadow-hover: 0 4px 12px rgba(60,64,67,0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --nav-height: 64px;
}

* { 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;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Navigation */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  max-width: 100vw;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.nav-brand svg { width: 28px; height: 28px; }
.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}
.nav-links a {
  display: block;
  padding: 8px 18px;
  border-radius: 20px;
  text-decoration: none;
  color: var(--text-light);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.25s ease;
}
.nav-links a:hover {
  color: var(--primary);
  background: rgba(26,115,232,0.06);
}
.nav-links a.active {
  color: var(--primary);
  background: rgba(26,115,232,0.1);
}

/* Layout */
main { padding-top: var(--nav-height); }
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 72px 0;
}
.section-alt {
  background: var(--bg-light);
}

/* Hero */
.hero {
  padding: 96px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #e8f0fe 0%, var(--bg) 100%);
}
.hero h1 {
  font-size: 52px;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text);
}
.hero h1 span { color: var(--primary); }
.hero-subtitle {
  font-size: 20px;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 32px;
  font-size: 14px;
  color: var(--text-light);
}
.hero-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s ease;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(26,115,232,0.3);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(26,115,232,0.35);
}
.btn-secondary {
  background: #fff;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-secondary:hover { background: rgba(26,115,232,0.04); }
.btn-lg { padding: 16px 40px; font-size: 18px; border-radius: var(--radius-lg); }
.btn-sm { padding: 10px 20px; font-size: 14px; }

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
}
.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: transparent;
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

/* Platform Cards */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}
.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: all 0.3s ease;
}
.platform-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.platform-card svg { width: 40px; height: 40px; margin-bottom: 14px; }
.platform-card h4 { font-size: 16px; margin-bottom: 6px; }
.platform-card p { font-size: 13px; color: var(--text-light); margin-bottom: 16px; }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  text-align: center;
}
.stat-item h3 {
  font-size: 42px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-item p { font-size: 15px; color: var(--text-light); }

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 16px;
}
.review-meta h4 { font-size: 15px; font-weight: 600; }
.stars { display: flex; gap: 2px; margin-top: 2px; }
.stars svg { width: 14px; height: 14px; }
.review-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* Comparison Table */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.compare-table th {
  background: var(--bg-light);
  font-weight: 600;
  font-size: 14px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table td:first-child { font-weight: 600; }
.check { color: var(--secondary); }
.cross { color: var(--danger); }
.dash { color: var(--text-light); }

/* Scenarios */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.scenario-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
}
.scenario-card svg { width: 36px; height: 36px; margin-bottom: 16px; }
.scenario-card h3 { font-size: 18px; margin-bottom: 10px; }
.scenario-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}
.faq-item p { font-size: 15px; color: var(--text-light); line-height: 1.7; }

/* Download page */
.download-hero {
  background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
  color: #fff;
  padding: 80px 0 64px;
  text-align: center;
}
.download-hero h1 { font-size: 42px; font-weight: 700; margin-bottom: 16px; }
.download-hero p { font-size: 18px; opacity: 0.9; max-width: 560px; margin: 0 auto 32px; }
.download-hero .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.download-hero .btn-primary:hover { background: #f8f9fa; }
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  margin-bottom: 24px;
}

/* Download cards */
.dl-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 20px;
}
.dl-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.dl-card-header svg { width: 40px; height: 40px; }
.dl-card-header h3 { font-size: 20px; }
.dl-card-header span { font-size: 13px; color: var(--text-light); }

/* Steps */
.steps {
  display: flex;
  gap: 16px;
  counter-reset: step;
}
.step-item {
  flex: 1;
  position: relative;
  padding-top: 40px;
}
.step-item::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}
.step-item h4 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.step-item p { font-size: 13px; color: var(--text-light); line-height: 1.6; }

/* Requirements table */
.req-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.req-table th, .req-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.req-table th { background: var(--bg-light); font-weight: 600; font-size: 13px; }

/* Changelog */
.changelog-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 24px;
}
.changelog-item:last-child { border-bottom: none; }
.changelog-version {
  min-width: 100px;
  font-weight: 700;
  color: var(--primary);
  font-size: 15px;
}
.changelog-date {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 6px;
}
.changelog-list { font-size: 14px; color: var(--text-light); padding-left: 16px; }
.changelog-list li { margin-bottom: 4px; }

/* Accordion FAQ */
.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.accordion-header {
  width: 100%;
  padding: 18px 24px;
  background: var(--bg-card);
  border: none;
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}
.accordion-header:hover { background: var(--bg-light); }
.accordion-header svg { width: 18px; height: 18px; transition: transform 0.3s ease; color: var(--text-light); }
.accordion-item.active .accordion-header svg { transform: rotate(180deg); }
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.accordion-item.active .accordion-body { max-height: 500px; }
.accordion-content {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--primary) 0%, #4285f4 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  margin: 48px 0;
}
.cta-banner h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.cta-banner p { font-size: 16px; opacity: 0.9; margin-bottom: 28px; }
.cta-banner .btn { background: #fff; color: var(--primary); }
.cta-banner .btn:hover { background: #f8f9fa; }

/* Section headers */
.section-header {
  text-align: center;
  margin-bottom: 52px;
}
.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-header p {
  font-size: 18px;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
}

/* Feature detail */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 64px;
}
.feature-detail:nth-child(even) { direction: rtl; }
.feature-detail:nth-child(even) > * { direction: ltr; }
.feature-detail h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; }
.feature-detail p { font-size: 16px; color: var(--text-light); line-height: 1.8; margin-bottom: 16px; }
.feature-detail-visual {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}
.feature-detail-visual svg { width: 120px; height: 120px; }

/* Footer */
.footer {
  background: var(--bg-light);
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 80px;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-light);
}
.footer-left svg { width: 18px; height: 18px; color: var(--secondary); }
.footer-right {
  font-size: 13px;
  color: var(--text-light);
  text-align: right;
}

/* Responsive */
@media (max-width: 768px) {
  .navbar { padding: 0 16px; }
  .nav-links a { padding: 6px 12px; font-size: 14px; }
  .hero h1 { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  .features-grid, .platform-grid { grid-template-columns: 1fr; }
  .feature-detail { grid-template-columns: 1fr; gap: 32px; }
  .feature-detail:nth-child(even) { direction: ltr; }
  .steps { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 28px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .cta-banner { padding: 40px 24px; }
  .cta-banner h2 { font-size: 24px; }
  .compare-table { font-size: 13px; }
  .compare-table th, .compare-table td { padding: 10px 12px; }
  .changelog-item { flex-direction: column; gap: 8px; }
}