/* ============================================
   Extension Library — Sales Website Styles
   ============================================ */

:root {
  --primary: #6366F1;
  --primary-dark: #4F46E5;
  --primary-light: #EEF2FF;
  --primary-50: #EEF2FF;
  --primary-100: #E0E7FF;
  --primary-600: #4F46E5;
  --primary-700: #4338CA;
  --violet: #8B5CF6;
  --green: #10B981;
  --amber: #F59E0B;
  --red: #EF4444;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --white: #FFFFFF;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition: 0.2s ease;
}

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); color: var(--gray-800); line-height: 1.6; background: var(--white); }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  border-bottom-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--gray-900);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--transition);
}

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

.nav-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 1px;
  transition: var(--transition);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: var(--radius);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(99,102,241,0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--white);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

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

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

.btn-upgrade {
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: var(--white);
  font-weight: 700;
  position: relative;
  overflow: hidden;
}

.btn-upgrade:hover {
  box-shadow: 0 6px 20px rgba(99,102,241,0.4);
  transform: translateY(-1px);
}

.btn-white {
  background: var(--white);
  color: var(--primary);
  font-weight: 700;
}

.btn-white:hover {
  background: var(--primary-50);
  transform: translateY(-1px);
}

.btn-outline-white {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
}

.btn-block {
  width: 100%;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(99,102,241,0.08) 0%, transparent 100%),
    radial-gradient(ellipse 40% 40% at 80% 20%, rgba(139,92,246,0.06) 0%, transparent 100%);
  z-index: -1;
}

.hero-inner {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-50);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid var(--primary-100);
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  color: var(--gray-900);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, #6366F1, #8B5CF6, #EC4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 18px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}

.hero-browsers {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.browser-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--gray-500);
  font-weight: 500;
}

/* ===== STATS BAR ===== */
.stats-bar {
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  padding: 32px 0;
  background: var(--gray-50);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 13px;
  color: var(--gray-500);
  font-weight: 500;
  margin-top: 2px;
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-badge {
  display: inline-block;
  background: var(--primary-50);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  border: 1px solid var(--primary-100);
}

.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== EXTENSIONS GRID ===== */
.extensions {
  padding: 96px 0;
}

.ext-filters {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  background: var(--gray-100);
  transition: all var(--transition);
}

.filter-btn:hover {
  background: var(--gray-200);
}

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

.ext-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.ext-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.ext-card:hover {
  border-color: var(--primary-100);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.ext-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.ext-card-content {
  flex: 1;
}

.ext-card-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.ext-card-content p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 12px;
}

.ext-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  font-size: 11px;
  padding: 3px 10px;
  background: var(--gray-100);
  color: var(--gray-600);
  border-radius: 100px;
  font-weight: 500;
}

.ext-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--gray-100);
}

.ext-free-info {
  font-size: 12px;
  color: var(--gray-400);
  font-weight: 500;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
  padding: 96px 0;
  background: var(--gray-50);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: center;
  padding: 32px 24px;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: var(--white);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.step p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== PRICING ===== */
.pricing {
  padding: 96px 0;
}

.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.pricing-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-400);
  cursor: pointer;
  transition: color var(--transition);
}

.pricing-label.active {
  color: var(--gray-900);
}

.save-badge {
  background: #DCFCE7;
  color: #16A34A;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 100px;
  font-weight: 600;
}

.pricing-switch {
  position: relative;
  width: 44px;
  height: 24px;
  display: inline-block;
  cursor: pointer;
}

.pricing-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.pricing-slider {
  position: absolute;
  inset: 0;
  background: var(--gray-300);
  border-radius: 24px;
  transition: var(--transition);
}

.pricing-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  bottom: 2px;
  background: var(--white);
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.pricing-switch input:checked + .pricing-slider {
  background: var(--primary);
}

.pricing-switch input:checked + .pricing-slider::before {
  transform: translateX(20px);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: start;
}

.price-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  transition: all 0.3s ease;
}

.price-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.price-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow-lg);
}

.price-card-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 100px;
  white-space: nowrap;
}

.price-card-header {
  margin-bottom: 20px;
}

.price-card-header h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.price-card-desc {
  font-size: 13px;
  color: var(--gray-500);
}

.price-amount {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 24px;
}

.price-currency {
  font-size: 24px;
  font-weight: 700;
  color: var(--gray-900);
  margin-right: 2px;
}

.price-value {
  font-size: 48px;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1;
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 14px;
  color: var(--gray-400);
  font-weight: 500;
  margin-left: 4px;
}

.price-features {
  margin-bottom: 28px;
}

.price-features li {
  padding: 8px 0;
  font-size: 14px;
  color: var(--gray-600);
  padding-left: 28px;
  position: relative;
}

.price-features li::before {
  position: absolute;
  left: 0;
  font-size: 14px;
}

.price-features li.included::before {
  content: '✓';
  color: var(--green);
  font-weight: 700;
}

.price-features li.excluded::before {
  content: '—';
  color: var(--gray-300);
}

.price-features li.excluded {
  color: var(--gray-400);
}

.pricing-note {
  text-align: center;
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 32px;
}

/* ===== TRUST ===== */
.trust {
  padding: 96px 0;
  background: var(--gray-50);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.trust-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all 0.3s ease;
}

.trust-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.trust-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-50);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.trust-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.trust-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq {
  padding: 96px 0;
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question::after {
  content: '+';
  font-size: 22px;
  font-weight: 400;
  color: var(--gray-400);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question::after {
  content: '−';
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== CTA ===== */
.cta {
  padding: 96px 0;
  background: var(--gray-50);
}

.cta-inner {
  background: linear-gradient(135deg, #4F46E5, #7C3AED, #8B5CF6);
  border-radius: var(--radius-xl);
  padding: 72px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(255,255,255,0.05) 0%, transparent 50%);
}

.cta-inner h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 12px;
  position: relative;
}

.cta-inner p {
  font-size: 17px;
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  margin: 0 auto 32px;
  position: relative;
}

.cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  position: relative;
}

/* ===== FOOTER ===== */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--gray-200);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--gray-500);
  padding: 4px 0;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--gray-200);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--gray-400);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  font-size: 13px;
  color: var(--gray-400);
  transition: color var(--transition);
}

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

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.ext-card,
.step,
.trust-card,
.price-card {
  opacity: 0;
  animation: fadeInUp 0.5s ease forwards;
}

.ext-card:nth-child(1) { animation-delay: 0.05s; }
.ext-card:nth-child(2) { animation-delay: 0.1s; }
.ext-card:nth-child(3) { animation-delay: 0.15s; }
.ext-card:nth-child(4) { animation-delay: 0.2s; }
.ext-card:nth-child(5) { animation-delay: 0.25s; }
.ext-card:nth-child(6) { animation-delay: 0.3s; }
.ext-card:nth-child(7) { animation-delay: 0.35s; }
.ext-card:nth-child(8) { animation-delay: 0.4s; }
.ext-card:nth-child(9) { animation-delay: 0.45s; }
.ext-card:nth-child(10) { animation-delay: 0.5s; }

.step:nth-child(1) { animation-delay: 0.1s; }
.step:nth-child(2) { animation-delay: 0.2s; }
.step:nth-child(3) { animation-delay: 0.3s; }

.price-card:nth-child(1) { animation-delay: 0.05s; }
.price-card:nth-child(2) { animation-delay: 0.1s; }
.price-card:nth-child(3) { animation-delay: 0.15s; }
.price-card:nth-child(4) { animation-delay: 0.2s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 10px 0;
    font-size: 16px;
  }

  .nav-actions .btn {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 120px 0 64px;
  }

  .hero h1 {
    font-size: 36px;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .cta-inner {
    padding: 48px 24px;
  }

  .cta-inner h2 {
    font-size: 28px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .price-value {
    font-size: 40px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }

  .hero-browsers {
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }

  .ext-filters {
    gap: 4px;
  }

  .filter-btn {
    padding: 6px 14px;
    font-size: 13px;
  }
}

/* Hidden utility */
.hidden {
  display: none !important;
}