/**
 * Boomlet iOS-Inspired UI Design System
 * 
 * A modern, clean design system inspired by Apple's iOS Human Interface Guidelines.
 * All classes are prefixed with `bi-ios-` to avoid conflicts with existing styles.
 * 
 * Design Principles:
 * - Clean, minimal, premium aesthetic
 * - Soft shadows, depth, rounded corners
 * - Card-based layouts
 * - Large readable typography
 * - Clear hierarchy
 * - Touch-friendly spacing
 * - Smooth transitions
 */

/* ============================================
   CSS VARIABLES (Boomlet Brand Colors)
   ============================================ */
:root {
  /* Primary Brand Colors (Boomlet Purple) */
  --bi-ios-primary: #7C3AED;
  --bi-ios-primary-dark: #6D28D9;
  --bi-ios-primary-light: #8B5CF6;
  --bi-ios-primary-gradient-start: #6F3FF5;
  --bi-ios-primary-gradient-end: #9B59B6;
  
  /* Neutral Colors */
  --bi-ios-bg-primary: #F5F5F7;
  --bi-ios-bg-secondary: #FFFFFF;
  --bi-ios-text-primary: #1D1D1F;
  --bi-ios-text-secondary: #6E6E73;
  --bi-ios-text-tertiary: #86868B;
  --bi-ios-border: #D2D2D7;
  --bi-ios-border-light: #E5E5E7;
  
  /* Semantic Colors */
  --bi-ios-success: #34C759;
  --bi-ios-success-light: #E8F5E9;
  --bi-ios-warning: #FF9500;
  --bi-ios-warning-light: #FFF4E6;
  --bi-ios-error: #FF3B30;
  --bi-ios-error-light: #FFEBEE;
  --bi-ios-info: #007AFF;
  --bi-ios-info-light: #E3F2FD;
  
  /* Shadows (iOS-style layered) */
  --bi-ios-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --bi-ios-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.06);
  --bi-ios-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.06);
  --bi-ios-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.05), 0 10px 10px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --bi-ios-radius-sm: 8px;
  --bi-ios-radius-md: 12px;
  --bi-ios-radius-lg: 16px;
  --bi-ios-radius-xl: 20px;
  
  /* Spacing */
  --bi-ios-spacing-xs: 4px;
  --bi-ios-spacing-sm: 8px;
  --bi-ios-spacing-md: 16px;
  --bi-ios-spacing-lg: 24px;
  --bi-ios-spacing-xl: 32px;
  --bi-ios-spacing-2xl: 48px;
  
  /* Typography */
  --bi-ios-font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Roboto", sans-serif;
}

/* ============================================
   BASE STYLES
   ============================================ */
.bi-ios-container {
  font-family: var(--bi-ios-font-family);
  background-color: var(--bi-ios-bg-primary);
  min-height: 100vh;
  color: var(--bi-ios-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TOP NAVIGATION BAR (iOS-style)
   ============================================ */
.bi-ios-navbar {
  background-color: var(--bi-ios-bg-secondary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 0.5px solid var(--bi-ios-border-light);
  padding: var(--bi-ios-spacing-md) var(--bi-ios-spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--bi-ios-shadow-sm);
}

.bi-ios-navbar-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bi-ios-navbar-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--bi-ios-text-primary);
  letter-spacing: -0.01em;
  margin: 0;
}

.bi-ios-navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--bi-ios-spacing-sm);
}

/* ============================================
   PAGE HEADER
   ============================================ */
.bi-ios-page-header {
  padding: var(--bi-ios-spacing-xl) var(--bi-ios-spacing-lg) var(--bi-ios-spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.bi-ios-page-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--bi-ios-text-primary);
  letter-spacing: -0.02em;
  margin: 0 0 var(--bi-ios-spacing-xs) 0;
  line-height: 1.2;
}

.bi-ios-page-subtitle {
  font-size: 15px;
  color: var(--bi-ios-text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ============================================
   CARD COMPONENT
   ============================================ */
.bi-ios-card {
  background-color: var(--bi-ios-bg-secondary);
  border-radius: var(--bi-ios-radius-lg);
  box-shadow: var(--bi-ios-shadow-md);
  padding: var(--bi-ios-spacing-lg);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 0.5px solid var(--bi-ios-border-light);
}

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

.bi-ios-card-header {
  margin-bottom: var(--bi-ios-spacing-md);
  padding-bottom: var(--bi-ios-spacing-md);
  border-bottom: 0.5px solid var(--bi-ios-border-light);
}

.bi-ios-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--bi-ios-text-primary);
  margin: 0 0 var(--bi-ios-spacing-xs) 0;
  letter-spacing: -0.01em;
}

.bi-ios-card-subtitle {
  font-size: 13px;
  color: var(--bi-ios-text-secondary);
  margin: 0;
}

.bi-ios-card-body {
  margin: 0;
}

.bi-ios-card-footer {
  margin-top: var(--bi-ios-spacing-md);
  padding-top: var(--bi-ios-spacing-md);
  border-top: 0.5px solid var(--bi-ios-border-light);
}

/* ============================================
   STAT CARD (Analytics)
   ============================================ */
.bi-ios-stat-card {
  background-color: var(--bi-ios-bg-secondary);
  border-radius: var(--bi-ios-radius-lg);
  box-shadow: var(--bi-ios-shadow-md);
  padding: var(--bi-ios-spacing-lg);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 0.5px solid var(--bi-ios-border-light);
  position: relative;
  overflow: hidden;
}

.bi-ios-stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--bi-ios-primary-gradient-start), var(--bi-ios-primary-gradient-end));
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.bi-ios-stat-card:hover::before {
  opacity: 1;
}

.bi-ios-stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--bi-ios-spacing-md);
}

.bi-ios-stat-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--bi-ios-text-secondary);
  margin: 0;
}

.bi-ios-stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--bi-ios-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bi-ios-primary-gradient-start), var(--bi-ios-primary-gradient-end));
  color: white;
  font-size: 18px;
}

.bi-ios-stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--bi-ios-text-primary);
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.bi-ios-stat-change {
  font-size: 13px;
  margin-top: var(--bi-ios-spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--bi-ios-spacing-xs);
}

.bi-ios-stat-change.positive {
  color: var(--bi-ios-success);
}

.bi-ios-stat-change.negative {
  color: var(--bi-ios-error);
}

.bi-ios-stat-change.neutral {
  color: var(--bi-ios-text-secondary);
}

/* ============================================
   BUTTON COMPONENTS
   ============================================ */
.bi-ios-button {
  font-family: var(--bi-ios-font-family);
  font-size: 15px;
  font-weight: 500;
  padding: var(--bi-ios-spacing-sm) var(--bi-ios-spacing-md);
  border-radius: var(--bi-ios-radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--bi-ios-spacing-xs);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  letter-spacing: -0.01em;
}

.bi-ios-button:active {
  transform: scale(0.98);
}

.bi-ios-button-primary {
  background: linear-gradient(135deg, var(--bi-ios-primary-gradient-start), var(--bi-ios-primary-gradient-end));
  color: white;
  box-shadow: var(--bi-ios-shadow-sm);
}

.bi-ios-button-primary:hover {
  box-shadow: var(--bi-ios-shadow-md);
  transform: translateY(-1px);
}

.bi-ios-button-primary:active {
  transform: scale(0.98);
  box-shadow: var(--bi-ios-shadow-sm);
}

.bi-ios-button-secondary {
  background-color: var(--bi-ios-bg-secondary);
  color: var(--bi-ios-primary);
  border: 1px solid var(--bi-ios-border);
  box-shadow: var(--bi-ios-shadow-sm);
}

.bi-ios-button-secondary:hover {
  background-color: var(--bi-ios-primary-light);
  color: white;
  border-color: var(--bi-ios-primary-light);
  box-shadow: var(--bi-ios-shadow-md);
}

.bi-ios-button-ghost {
  background-color: transparent;
  color: var(--bi-ios-text-primary);
  border: none;
}

.bi-ios-button-ghost:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.bi-ios-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================
   BADGE / TAG COMPONENT
   ============================================ */
.bi-ios-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--bi-ios-spacing-xs) var(--bi-ios-spacing-sm);
  border-radius: var(--bi-ios-radius-xl);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.bi-ios-badge-primary {
  background-color: var(--bi-ios-primary-light);
  color: white;
}

.bi-ios-badge-success {
  background-color: var(--bi-ios-success-light);
  color: var(--bi-ios-success);
}

.bi-ios-badge-warning {
  background-color: var(--bi-ios-warning-light);
  color: var(--bi-ios-warning);
}

.bi-ios-badge-error {
  background-color: var(--bi-ios-error-light);
  color: var(--bi-ios-error);
}

.bi-ios-badge-info {
  background-color: var(--bi-ios-info-light);
  color: var(--bi-ios-info);
}

.bi-ios-badge-neutral {
  background-color: var(--bi-ios-border-light);
  color: var(--bi-ios-text-secondary);
}

/* ============================================
   TABLE WRAPPER (Modern Card Table)
   ============================================ */
.bi-ios-table-wrapper {
  background-color: var(--bi-ios-bg-secondary);
  border-radius: var(--bi-ios-radius-lg);
  box-shadow: var(--bi-ios-shadow-md);
  overflow: hidden;
  border: 0.5px solid var(--bi-ios-border-light);
}

.bi-ios-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.bi-ios-table thead {
  background-color: var(--bi-ios-bg-primary);
}

.bi-ios-table th {
  padding: var(--bi-ios-spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--bi-ios-text-primary);
  font-size: 13px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  border-bottom: 0.5px solid var(--bi-ios-border-light);
}

.bi-ios-table td {
  padding: var(--bi-ios-spacing-md);
  border-bottom: 0.5px solid var(--bi-ios-border-light);
  color: var(--bi-ios-text-primary);
}

.bi-ios-table tbody tr {
  transition: background-color 0.2s ease;
}

.bi-ios-table tbody tr:hover {
  background-color: var(--bi-ios-bg-primary);
}

.bi-ios-table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   EMPTY STATE COMPONENT
   ============================================ */
.bi-ios-empty-state {
  text-align: center;
  padding: var(--bi-ios-spacing-2xl) var(--bi-ios-spacing-lg);
  color: var(--bi-ios-text-secondary);
}

.bi-ios-empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--bi-ios-spacing-md);
  border-radius: var(--bi-ios-radius-lg);
  background-color: var(--bi-ios-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--bi-ios-text-tertiary);
}

.bi-ios-empty-state-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--bi-ios-text-primary);
  margin: 0 0 var(--bi-ios-spacing-xs) 0;
}

.bi-ios-empty-state-description {
  font-size: 14px;
  color: var(--bi-ios-text-secondary);
  margin: 0 0 var(--bi-ios-spacing-md) 0;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   LOADER / SKELETON UI
   ============================================ */
.bi-ios-skeleton {
  background: linear-gradient(
    90deg,
    var(--bi-ios-bg-primary) 0%,
    var(--bi-ios-border-light) 50%,
    var(--bi-ios-bg-primary) 100%
  );
  background-size: 200% 100%;
  animation: bi-ios-skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--bi-ios-radius-sm);
}

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

.bi-ios-skeleton-text {
  height: 16px;
  margin-bottom: var(--bi-ios-spacing-xs);
}

.bi-ios-skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: var(--bi-ios-spacing-md);
}

.bi-ios-skeleton-card {
  height: 120px;
  border-radius: var(--bi-ios-radius-lg);
}

.bi-ios-loader {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--bi-ios-border-light);
  border-top-color: var(--bi-ios-primary);
  border-radius: 50%;
  animation: bi-ios-spin 0.8s linear infinite;
}

@keyframes bi-ios-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   GRID LAYOUTS
   ============================================ */
.bi-ios-grid {
  display: grid;
  gap: var(--bi-ios-spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--bi-ios-spacing-lg);
}

.bi-ios-grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.bi-ios-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.bi-ios-grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.bi-ios-section {
  margin-bottom: var(--bi-ios-spacing-xl);
}

.bi-ios-divider {
  height: 0.5px;
  background-color: var(--bi-ios-border-light);
  margin: var(--bi-ios-spacing-lg) 0;
  border: none;
}

.bi-ios-text-meta {
  font-size: 12px;
  color: var(--bi-ios-text-tertiary);
}

.bi-ios-text-secondary {
  color: var(--bi-ios-text-secondary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .bi-ios-page-header {
    padding: var(--bi-ios-spacing-lg) var(--bi-ios-spacing-md);
  }
  
  .bi-ios-page-title {
    font-size: 22px;
  }
  
  .bi-ios-card {
    padding: var(--bi-ios-spacing-md);
  }
  
  .bi-ios-grid {
    grid-template-columns: 1fr;
    padding: 0 var(--bi-ios-spacing-md);
  }
  
  .bi-ios-table-wrapper {
    overflow-x: auto;
  }
  
  .bi-ios-table {
    min-width: 600px;
  }
  
  .bi-ios-navbar {
    padding: var(--bi-ios-spacing-sm) var(--bi-ios-spacing-md);
  }
  
  .bi-ios-navbar-title {
    font-size: 18px;
  }
}

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

/* Focus states for keyboard navigation */
.bi-ios-button:focus-visible,
.bi-ios-card:focus-visible {
  outline: 2px solid var(--bi-ios-primary);
  outline-offset: 2px;
}