/* ==========================================================================
   Ecom Squire - Design System & Core Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design System)
   -------------------------------------------------------------------------- */
:root {
  /* Foundation (Dark Mode Authority) */
  --bg-base: #0a0a0a;          /* Deepest Black */
  --bg-secondary: #0f1115;      /* Secondary Surface */
  --bg-card: #16191e;           /* Component Backgrounds */
  --bg-surface: #1e222a;        /* Card surfaces */
  
  /* Action & Accents */
  --primary: #47b2e4;          /* Bright Teal */
  --primary-glow: rgba(71, 178, 228, 0.15);
  --primary-hover: #31a9e1;
  --accent-gold: #c5a059;      /* Premium accent */
  
  /* Text Hierarchy */
  --text-main: #e2e8f0;        /* Off-white */
  --text-dim: #94a3b8;         /* Muted blue-gray */
  --text-white: #ffffff;
  
  /* Typography */
  --font-heading: 'Jost', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'Space Mono', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 50%;
  
  /* Shadows & Effects */
  --glow-teal: 0 0 15px rgba(71, 178, 228, 0.3);
  --glow-gold: 0 0 20px rgba(197, 160, 89, 0.2);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s ease;
  
  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-overlay: 400;
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-base);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-white);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

.overline {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  display: block;
  margin-bottom: var(--space-sm);
}

.text-dim {
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-2xl) 0;
}

.section-dark {
  background-color: var(--bg-secondary);
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-white);
  box-shadow: var(--glow-teal);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(71, 178, 228, 0.4);
}

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

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

.btn-ghost {
  background-color: var(--glass-bg);
  border: var(--glass-border);
  color: var(--text-main);
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: var(--primary);
}

/* --------------------------------------------------------------------------
   Grid System
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--bg-card);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.card:hover {
  background: var(--glass-bg);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-5px);
  box-shadow: var(--glow-teal);
}

.card-featured {
  border-color: var(--primary);
  box-shadow: var(--glow-teal);
  position: relative;
}

.card-featured::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--primary), transparent);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-main);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-input::placeholder {
  color: var(--text-dim);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* --------------------------------------------------------------------------
   Animation Classes (Intersection Observer)
   -------------------------------------------------------------------------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* Hardware acceleration for smooth animations */
.animate-transform {
  will-change: transform;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

/* --------------------------------------------------------------------------
   Loading States
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-card) 25%,
    var(--bg-surface) 50%,
    var(--bg-card) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --------------------------------------------------------------------------
   Badge & Tag Styles
   -------------------------------------------------------------------------- */
.badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}

.badge-primary {
  background-color: var(--primary-glow);
  color: var(--primary);
}

.badge-gold {
  background-color: rgba(197, 160, 89, 0.2);
  color: var(--accent-gold);
}

/* --------------------------------------------------------------------------
   Progress Bar
   -------------------------------------------------------------------------- */
.progress-bar {
  height: 8px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--bg-secondary), var(--primary));
  border-radius: 4px;
  width: 0;
  transition: width 2s ease-out;
}

/* --------------------------------------------------------------------------
   Accordion
   -------------------------------------------------------------------------- */
.accordion-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.accordion-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) 0;
  background: none;
  color: var(--text-white);
  font-size: 1.125rem;
  font-weight: 600;
  text-align: left;
  transition: color var(--transition-fast);
}

.accordion-header:hover {
  color: var(--primary);
}

.accordion-icon {
  width: 24px;
  height: 24px;
  transition: transform var(--transition-base);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.accordion-content.open {
  max-height: 500px;
}

.accordion-body {
  padding-bottom: var(--space-lg);
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   Trust Ribbon (Logo Carousel)
   -------------------------------------------------------------------------- */
.trust-ribbon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  opacity: 0.6;
}

.trust-ribbon img {
  height: 40px;
  filter: grayscale(1) brightness(0.8);
  transition: all var(--transition-base);
}

.trust-ribbon img:hover {
  filter: grayscale(0) brightness(1);
}

/* --------------------------------------------------------------------------
   Stats / Impact Bar
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stat-item {
  padding: var(--space-md);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}