/**
 * KIUAE Modern Design System
 * Addresses Pain Points 1 & 2: UI Modernization and UX Friction
 * 
 * Features:
 * - Consistent modern visual hierarchy
 * - Smooth micro-interactions
 * - Mobile-first responsive design
 * - Accessible color system
 * - Professional enterprise styling
 */

/* ===== CSS Custom Properties (Design Tokens) ===== */
:root {
  /* Color System - Modern & Accessible */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  /* Neutral Colors */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Semantic Colors */
  --success-50: #f0fdf4;
  --success-500: #22c55e;
  --success-600: #16a34a;
  --warning-50: #fefce8;
  --warning-500: #eab308;
  --warning-600: #ca8a04;
  --error-50: #fef2f2;
  --error-500: #ef4444;
  --error-600: #dc2626;

  /* Typography Scale */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing Scale */
  --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 */
  --radius-sm: 0.125rem;  /* 2px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;

  /* Shadows - Modern & Subtle */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 350ms cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Enhanced Gradients for Modern UI */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --warning-gradient: linear-gradient(135deg, #fc4a1a 0%, #f7b733 100%);
  --info-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --danger-gradient: linear-gradient(135deg, #fd79a8 0%, #fdcb6e 100%);

  /* Glass Morphism System */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-bg-dark: rgba(255, 255, 255, 0.05);
  --glass-border-dark: rgba(255, 255, 255, 0.1);

  /* Extended Border Radius */
  --border-radius: var(--radius-lg);
  --border-radius-lg: var(--radius-xl);
  --border-radius-xl: var(--radius-2xl);

  /* Enhanced Shadow System */
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --card-shadow-focus: 0 0 0 3px rgba(66, 153, 225, 0.5);

  /* Text and Background Colors */
  --text-color: var(--gray-900);
  --text-light: var(--gray-600);
  --primary-color: var(--primary-600);
  --bg-white: #ffffff;
  --bg-light: var(--gray-50);
  --border-color: var(--gray-200);
}

/* ===== Base Styles Reset ===== */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Modern Card System ===== */
.modern-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.modern-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  border-color: var(--primary-300);
}

.modern-card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-200);
  background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
}

.modern-card-body {
  padding: var(--space-6);
}

.modern-card-footer {
  padding: var(--space-4) var(--space-6);
  background-color: var(--gray-50);
  border-top: 1px solid var(--gray-200);
}

/* Card Variants */
.modern-card-primary {
  border-color: var(--primary-300);
}

.modern-card-primary .modern-card-header {
  background: linear-gradient(135deg, var(--primary-50) 0%, white 100%);
  border-color: var(--primary-200);
}

.modern-card-elevated {
  box-shadow: var(--shadow-lg);
  border: none;
}

.modern-card-compact .modern-card-body {
  padding: var(--space-4);
}

/* ===== Modern Button System ===== */
.modern-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  line-height: 1;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px; /* Mobile touch target */
  position: relative;
  overflow: hidden;
}

.modern-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Button Variants */
.modern-btn-primary {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.modern-btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.modern-btn-secondary {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
  box-shadow: var(--shadow-sm);
}

.modern-btn-secondary:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--gray-400);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.modern-btn-ghost {
  background: transparent;
  color: var(--primary-600);
  border: 1px solid transparent;
}

.modern-btn-ghost:hover:not(:disabled) {
  background: var(--primary-50);
  border-color: var(--primary-200);
}

/* Button Sizes */
.modern-btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  min-height: 36px;
}

.modern-btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  min-height: 52px;
}

/* ===== Modern Form System ===== */
.modern-form-group {
  margin-bottom: var(--space-6);
}

.modern-form-label {
  display: block;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.modern-form-label.required::after {
  content: '*';
  color: var(--error-500);
  margin-left: var(--space-1);
}

.modern-form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--gray-900);
  background-color: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  min-height: 44px; /* Mobile touch target */
}

.modern-form-input:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px var(--primary-100);
}

.modern-form-input::placeholder {
  color: var(--gray-400);
}

/* Form States */
.modern-form-group.has-error .modern-form-input {
  border-color: var(--error-500);
}

.modern-form-group.has-error .modern-form-input:focus {
  box-shadow: 0 0 0 3px var(--error-50);
}

.modern-form-group.has-success .modern-form-input {
  border-color: var(--success-500);
}

.modern-form-group.has-success .modern-form-input:focus {
  box-shadow: 0 0 0 3px var(--success-50);
}

/* ===== Modern Status System ===== */
.modern-status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.modern-status-processing {
  background: var(--primary-100);
  color: var(--primary-800);
  border: 1px solid var(--primary-200);
}

.modern-status-completed {
  background: var(--success-100);
  color: var(--success-800);
  border: 1px solid var(--success-200);
}

.modern-status-failed {
  background: var(--error-100);
  color: var(--error-800);
  border: 1px solid var(--error-200);
}

.modern-status-pending {
  background: var(--gray-100);
  color: var(--gray-800);
  border: 1px solid var(--gray-200);
}

/* ===== Modern Layout System ===== */
.modern-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.modern-grid {
  display: grid;
  gap: var(--space-6);
}

.modern-grid-cols-1 {
  grid-template-columns: 1fr;
}

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

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

/* Modern Filter Grid */
.modern-filter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.modern-filters-form {
  width: 100%;
}

@media (max-width: 768px) {
  .modern-filter-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* ===== Modern Dashboard Components ===== */
.modern-dashboard {
  padding: var(--space-8) 0;
}

.modern-dashboard-header {
  margin-bottom: var(--space-8);
}

.modern-dashboard-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}

.modern-dashboard-subtitle {
  font-size: var(--text-lg);
  color: var(--gray-600);
  margin-bottom: var(--space-6);
}

.modern-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.modern-quick-action {
  flex: 1;
  min-width: 280px;
  padding: var(--space-6);
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.modern-quick-action:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--primary-300);
}

.modern-quick-action-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--primary-100);
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
}

.modern-quick-action-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
  color: var(--gray-900);
}

.modern-quick-action-description {
  font-size: var(--text-sm);
  color: var(--gray-600);
  line-height: 1.5;
}

/* ===== Progressive Disclosure System ===== */
.modern-collapsible {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  background: white;
  overflow: hidden;
}

.modern-collapsible-header {
  padding: var(--space-4) var(--space-6);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: between;
  transition: all var(--transition-fast);
  user-select: none;
}

.modern-collapsible-header:hover {
  background: var(--gray-100);
}

.modern-collapsible-title {
  font-weight: var(--font-medium);
  color: var(--gray-900);
  flex: 1;
}

.modern-collapsible-icon {
  color: var(--gray-500);
  transition: transform var(--transition-fast);
}

.modern-collapsible.expanded .modern-collapsible-icon {
  transform: rotate(180deg);
}

.modern-collapsible-content {
  padding: var(--space-6);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.modern-collapsible.expanded .modern-collapsible-content {
  max-height: 1000px; /* Large enough for content */
}

/* ===== Mobile-First Responsive System ===== */
@media (max-width: 640px) {
  .modern-container {
    padding: 0 var(--space-3);
  }

  .modern-grid-cols-2,
  .modern-grid-cols-3 {
    grid-template-columns: 1fr;
  }

  .modern-quick-actions {
    flex-direction: column;
  }

  .modern-quick-action {
    min-width: auto;
  }

  .modern-dashboard-title {
    font-size: var(--text-2xl);
  }

  .modern-btn {
    width: 100%;
    justify-content: center;
  }

  .modern-btn-group .modern-btn {
    width: auto;
    flex: 1;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .modern-grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

@media (prefers-contrast: high) {
  :root {
    --gray-300: #6b7280;
    --gray-400: #4b5563;
  }
}

/* Focus visible for better keyboard navigation */
.modern-btn:focus-visible,
.modern-form-input:focus-visible,
.modern-quick-action:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* ===== Animation Utilities ===== */
.modern-fade-in {
  animation: fadeIn var(--transition-normal) ease-in-out;
}

.modern-slide-up {
  animation: slideUp var(--transition-normal) ease-out;
}

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

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

/* ===== Print Styles ===== */
@media print {
  .modern-card {
    box-shadow: none;
    border: 1px solid var(--gray-300);
  }

  .modern-btn {
    border: 1px solid var(--gray-300);
  }
}