/* ==========================================================================
   AC PROS BROWNSVILLE - Modern American HVAC Styling System
   Mobile-First, High-Contrast, Fast & Accessible
   ========================================================================== */

/* Font Import with font-display: swap for performance */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  /* Brand Palette */
  --color-navy-900: #0f172a;
  --color-navy-800: #1e293b;
  --color-blue-600: #0284c7;
  --color-blue-700: #0369a1;
  --color-cyan-500: #0ea5e9;
  --color-emerald-500: #10b981;
  --color-slate-100: #f1f5f9;
  --color-slate-50: #f8fafc;
  --color-slate-700: #334155;
  --color-slate-900: #0f172a;

  /* Layout & Utility */
  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition-fast: 200ms ease;
  --transition-normal: 300ms ease;
}

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

html {
  font-family: var(--font-main);
  color: var(--color-slate-700);
  background-color: var(--color-slate-50);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--color-cyan-500);
  outline-offset: 2px;
}

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-navy-900);
  color: white;
  padding: 8px 16px;
  z-index: 100;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 0;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-navy-900);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-slate-100);
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-blue-600);
}

/* Navigation Header */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
}

/* Mobile Sticky Bottom CTA Bar */
.mobile-cta-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 45;
  background: rgba(15, 23, 42, 0.98);
  backdrop-filter: blur(8px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.65rem 1rem;
}

/* Button & Micro-Interactions */
.btn-primary {
  background-color: var(--color-blue-600);
  color: #ffffff;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.btn-primary:hover {
  background-color: var(--color-blue-700);
  transform: translateY(-1px);
}

.btn-whatsapp {
  background-color: var(--color-emerald-500);
  color: #ffffff;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.btn-whatsapp:hover {
  background-color: #059669;
  transform: translateY(-1px);
}

/* Card Styling */
.service-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.service-card:hover {
  border-color: var(--color-cyan-500);
  box-shadow: 0 10px 25px -5px rgba(14, 165, 233, 0.1), 0 8px 10px -6px rgba(14, 165, 233, 0.05);
  transform: translateY(-2px);
}

/* Respect Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}