/* ==================== SIZEVIBE PREMIUM UI SYSTEM ==================== */
/* 20+ Years UX/UI Expertise - Luxury Fashion Intelligence Interface */
/* Design Philosophy: Sophisticated, Accessible, Performance-Optimized */

/* ==================== CSS CUSTOM PROPERTIES ==================== */
:root {
  /* Premium Color Palette - Luxury Neutrals */
  --color-primary: #2D2A2E;           /* Warm Charcoal - Sophistication */
  --color-secondary: #D4AF37;         /* Champagne Gold - Luxury Accent */
  --color-tertiary: #F8F6F0;          /* Soft Cream - Elegance */
  --color-interactive: #E8B4B8;       /* Rose Gold - Modern Luxury */
  --color-success: #87A96B;           /* Sage Green - Natural Confidence */
  --color-warning: #CC6B49;           /* Burnt Orange - Premium Alert */
  --color-background: #FDFCF8;        /* Warm White - Luxe Background */
  --color-surface: #FFFFFF;           /* Pure White - Clean Surface */
  --color-surface-elevated: #FFFFFF;  /* Elevated Surface */
  
  /* Semantic Colors */
  --color-text-primary: #2D2A2E;
  --color-text-secondary: #6B6B6B;
  --color-text-tertiary: #9B9B9B;
  --color-border-light: #E8E6E0;
  --color-border-medium: #D4D1C7;
  
  /* Typography Scale - Fashion Editorial Inspired */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-family-display: 'Playfair Display', Georgia, serif;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing System - 8pt Grid */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  
  /* Border Radius - Refined System */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows - Luxury Depth */
  --shadow-sm: 0 1px 2px 0 rgba(45, 42, 46, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(45, 42, 46, 0.1), 0 2px 4px -1px rgba(45, 42, 46, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(45, 42, 46, 0.1), 0 4px 6px -2px rgba(45, 42, 46, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(45, 42, 46, 0.1), 0 10px 10px -5px rgba(45, 42, 46, 0.04);
  
  /* Transitions - Smooth UX */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.25s ease-out;
  --transition-slow: 0.35s ease-out;
  
  /* Layout */
  --sidebar-width: 280px;
  --header-height: 64px;
}

/* ==================== BASE STYLES ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow-x: hidden;
}

/* ==================== APP LAYOUT ==================== */
.app-container {
  display: flex;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--color-background) 0%, #FBF9F3 100%);
}

/* ==================== SIDEBAR NAVIGATION ==================== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.sidebar-header {
  padding: var(--space-6) var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-icon svg {
  width: 32px;
  height: 32px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-family-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  letter-spacing: -0.025em;
}

.brand-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.05em;
}

.nav-items {
  flex: 1;
  padding: var(--space-6) 0;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  margin: 0 var(--space-4) var(--space-1);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  position: relative;
}

.nav-item:hover {
  background: linear-gradient(135deg, rgba(232, 180, 184, 0.1) 0%, rgba(212, 175, 55, 0.05) 100%);
  color: var(--color-primary);
  transform: translateX(2px);
}

.nav-item.active {
  background: linear-gradient(135deg, var(--color-interactive) 0%, var(--color-secondary) 100%);
  color: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.nav-item i {
  width: 20px;
  font-size: var(--font-size-base);
}

.badge {
  background: var(--color-secondary);
  color: var(--color-surface);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  margin-left: auto;
}

.sidebar-footer {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border-light);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 2px solid var(--color-border-light);
}

.user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.user-status {
  font-size: var(--font-size-xs);
  color: var(--color-secondary);
  font-weight: var(--font-weight-medium);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-8);
  min-height: 100vh;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
  animation: fadeInUp 0.4s ease-out;
}

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

/* ==================== PAGE HEADER ==================== */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
}

.page-title {
  font-family: var(--font-family-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.025em;
}

.page-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-normal);
}

.header-actions {
  display: flex;
  gap: var(--space-3);
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-interactive) 0%, var(--color-secondary) 100%);
  color: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--color-tertiary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-secondary);
  font-weight: var(--font-weight-medium);
  padding: var(--space-2);
  cursor: pointer;
  transition: color var(--transition-base);
}

.btn-link:hover {
  color: var(--color-primary);
}

/* ==================== STATS GRID ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-interactive) 0%, var(--color-secondary) 100%);
}

.stat-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.stat-card {
  display: flex;
  gap: var(--space-4);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-interactive) 0%, var(--color-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-surface);
  font-size: var(--font-size-xl);
}

.stat-content {
  flex: 1;
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
  font-family: var(--font-family-display);
}

.stat-label {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

.stat-change {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.stat-change.positive {
  background: rgba(135, 169, 107, 0.1);
  color: var(--color-success);
}

/* ==================== DASHBOARD GRID ==================== */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.dashboard-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.dashboard-card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
}

.card-header h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }
  
  .sidebar.show {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: var(--space-6) var(--space-4);
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 640px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}