/* ============================================================
   ZIN AI / AIHUB - WORLD-CLASS SAAS DESIGN SYSTEM
   ============================================================ */

:root {
  --bg-main: #f8f9fc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --border-color: rgba(226, 232, 240, 0.9);
  --border-card: rgba(226, 232, 240, 0.8);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-sub: #475569;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --accent-purple: #8b5cf6;
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.02);
  --badge-bg: rgba(99, 102, 241, 0.08);
  --badge-text: #4f46e5;
  --toggle-bg: #f1f5f9;
}

html.dark {
  --bg-main: #070b17;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-nav: rgba(7, 11, 23, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.08);
  --text-main: #ffffff;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --accent-purple: #a855f7;
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --badge-bg: rgba(99, 102, 241, 0.15);
  --badge-text: #818cf8;
  --toggle-bg: #0f172a;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: 'Montserrat', system-ui, -apple-system, sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #4f46e5;
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: #6366f1;
}

/* Theme Elements */
.theme-bg-main { background-color: var(--bg-main); }
.theme-bg-card { 
  background-color: var(--bg-card); 
  border: 1px solid var(--border-card);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.theme-bg-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}
.theme-text-main { color: var(--text-main); }
.theme-text-muted { color: var(--text-muted); }
.theme-text-sub { color: var(--text-sub); }
.theme-border { border-color: var(--border-color); }

/* Glassmorphism */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  box-shadow: var(--card-shadow);
}

.glass-card-hover {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.glass-card-hover:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: 0 12px 30px -4px rgba(99, 102, 241, 0.15);
}

/* Navbar Scrolled */
#navbar {
  background-color: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

/* Hero Section */
.hero-glow {
  position: absolute;
  top: -100px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, rgba(139, 92, 246, 0.08) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Billing Toggle */
.billing-toggle-container {
  background: var(--toggle-bg);
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: 9999px;
  display: inline-flex;
}

.billing-toggle-btn {
  padding: 8px 20px;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s ease;
  color: var(--text-muted);
  cursor: pointer;
}

.billing-toggle-btn.active {
  background: #6366f1;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.4);
}

/* Badge Shimmer */
.badge-shimmer {
  background: linear-gradient(90deg, #6366f1, #818cf8, #6366f1);
  background-size: 200% auto;
  animation: shimmer 2s linear infinite;
}
@keyframes shimmer {
  to { background-position: 200% center; }
}

/* Category Filter Chips */
.category-chip {
  padding: 8px 18px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}
.category-chip:hover {
  color: var(--text-main);
  border-color: rgba(99, 102, 241, 0.4);
}
.category-chip.active {
  background: #6366f1 !important;
  color: #ffffff !important;
  border-color: #6366f1 !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

/* FAQ Accordion */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  transition: border-color 0.2s;
}
.faq-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

/* Floating WhatsApp Button */
#whatsapp-btn {
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.3);
}
#whatsapp-btn:hover {
  box-shadow: 0 8px 30px rgba(37, 211, 102, 0.5);
  transform: scale(1.08);
}

/* Responsive Overrides */
@media (max-width: 768px) {
  #hero h1 { font-size: 2.25rem; }
  .billing-toggle-btn { padding: 6px 14px; font-size: 0.8rem; }
}