/* ==========================================================================
   YDigitalCommerce Premium Design System
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #111827;
  --color-secondary: #2563EB;
  --color-success: #22C55E;
  --color-danger: #EF4444;
  --color-warning: #F59E0B;
  
  --color-bg: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-border: #E5E7EB;
  
  --color-text: #111827;
  --color-text-muted: #6B7280;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-weight-regular: 400;
  --font-weight-button: 600;
  --font-weight-heading: 700;

  /* Border Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-btn: 12px;
  --radius-card: 16px;
  --radius-pill: 9999px;

  /* Spacing (8px system) */
  --spacing-1: 8px;
  --spacing-2: 16px;
  --spacing-3: 24px;
  --spacing-4: 32px;
  --spacing-5: 40px;
  --spacing-6: 48px;
  --spacing-8: 64px;
  --spacing-12: 96px;

  /* Shadows (Soft & Premium) */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 20px 40px -10px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Overrides */
body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-heading);
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  letter-spacing: -0.02em;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

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

/* Layout */
.container, .container-lg, .container-md, .container-sm, .container-xl, .container-xxl {
  max-width: 1440px;
  padding-left: var(--spacing-3);
  padding-right: var(--spacing-3);
}

.content-wrapper {
  max-width: 1320px;
  margin: 0 auto;
}

/* Section Spacing */
.section-padding {
  padding-top: var(--spacing-8);
  padding-bottom: var(--spacing-8);
}
@media (min-width: 992px) {
  .section-padding {
    padding-top: var(--spacing-12);
    padding-bottom: var(--spacing-12);
  }
}

/* Buttons */
.btn {
  font-weight: var(--font-weight-button);
  border-radius: var(--radius-btn);
  padding: 12px 24px;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover, .btn-primary:focus {
  background-color: #000000;
  color: var(--color-bg);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background-color: #1D4ED8;
  color: var(--color-bg);
  box-shadow: var(--shadow-md);
}

.btn-outline-primary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

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

/* Form Inputs */
.form-control, .form-select {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: all var(--transition-normal);
  font-size: 0.95rem;
}

.form-control:focus, .form-select:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  outline: none;
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

/* Cards */
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background-color: var(--color-bg);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.premium-hover-card {
  transition: all var(--transition-slow);
}
.premium-hover-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: transparent;
}

/* Badges */
.badge {
  border-radius: var(--radius-pill);
  padding: 6px 12px;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}
.badge-danger { background-color: var(--color-danger); color: white; }
.badge-success { background-color: var(--color-success); color: white; }
.badge-warning { background-color: var(--color-warning); color: #000; }
.badge-dark { background-color: var(--color-primary); color: white; }

/* Utilities */
.text-muted { color: var(--color-text-muted) !important; }
.bg-surface { background-color: var(--color-surface) !important; }
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }

/* Animations & Micro-Interactions */
.animate-fade-in {
  animation: fadeIn var(--transition-slow) forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) forwards;
}

.hover-lift {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Skeleton Loading (Performance & Polish) */
.skeleton {
  background: #e2e5e7;
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0),
    rgba(255, 255, 255, 0.5),
    rgba(255, 255, 255, 0)
  );
  background-size: 40px 100%;
  background-repeat: no-repeat;
  background-position: left -40px top 0;
  animation: shine 1s ease-infinite;
}

@keyframes shine {
  to {
    background-position: right -40px top 0;
  }
}

/* Accessibility */
:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.5); /* Primary blue focus ring */
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-to-content:focus {
  top: 0;
}

/* Premium Header */
.premium-header {
  position: sticky;
  top: 0;
  z-index: 1020;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.premium-header.header-scrolled {
  box-shadow: var(--shadow-sm);
}

.premium-nav-link {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--spacing-2);
  transition: color var(--transition-normal);
}
.premium-nav-link:hover {
  color: var(--color-secondary);
}

/* Icon Buttons */
.btn-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  transition: all var(--transition-normal);
  color: var(--color-text);
  background: transparent;
  border: none;
}
.btn-icon:hover {
  background: var(--color-surface);
  color: var(--color-primary);
}

/* Mobile Bottom Nav */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  z-index: 1030;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -4px 10px rgba(0,0,0,0.03);
}

@media (max-width: 991px) {
  .mobile-bottom-nav {
    display: flex;
    justify-content: space-around;
    padding-top: 12px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
  }
  
  .desktop-only {
    display: none !important;
  }
  
  body {
    padding-bottom: 80px; /* Space for bottom nav */
  }
}

.nav-item-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  gap: 4px;
}
.nav-item-bottom.active {
  color: var(--color-primary);
}
.nav-item-bottom i {
  stroke-width: 2px;
}