/**
 * SkyAdmin Modern CSS Framework - FASE H
 * Modern, accessible, performance-optimized styles
 */

/* ========================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ======================================== */

:root {
  /* Color System */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;

  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;

  --success-500: #10b981;
  --warning-500: #f59e0b;
  --error-500: #ef4444;
  --info-500: #06b6d4;

  /* Typography */
  --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 
                      'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', 
                      Consolas, 'Courier New', monospace;

  /* Font Sizes (Fluid Typography) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.3rem + 0.8vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.6rem + 1vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 1.9rem + 1.5vw, 3rem);

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;

  /* Shadows */
  --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 ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --neutral-50: #171717;
    --neutral-100: #262626;
    --neutral-200: #404040;
    --neutral-300: #525252;
    --neutral-400: #737373;
    --neutral-500: #a3a3a3;
    --neutral-600: #d4d4d4;
    --neutral-700: #e5e5e5;
    --neutral-800: #f5f5f5;
    --neutral-900: #fafafa;
  }
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  font-feature-settings: normal;
  font-variation-settings: normal;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--neutral-900);
  background-color: var(--neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LAYOUT SYSTEM
   ======================================== */

.skyadmin-container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.skyadmin-container--sm { max-width: var(--container-sm); }
.skyadmin-container--md { max-width: var(--container-md); }
.skyadmin-container--lg { max-width: var(--container-lg); }
.skyadmin-container--xl { max-width: var(--container-xl); }
.skyadmin-container--2xl { max-width: var(--container-2xl); }

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

.skyadmin-grid--cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.skyadmin-grid--cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.skyadmin-grid--cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.skyadmin-grid--cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Responsive Grid */
@media (max-width: 768px) {
  .skyadmin-grid--cols-2,
  .skyadmin-grid--cols-3,
  .skyadmin-grid--cols-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .skyadmin-grid--cols-3,
  .skyadmin-grid--cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Flexbox Utilities */
.skyadmin-flex {
  display: flex;
}

.skyadmin-flex--col {
  flex-direction: column;
}

.skyadmin-flex--wrap {
  flex-wrap: wrap;
}

.skyadmin-flex--center {
  align-items: center;
  justify-content: center;
}

.skyadmin-flex--between {
  justify-content: space-between;
}

.skyadmin-flex--gap-sm { gap: var(--space-sm); }
.skyadmin-flex--gap-md { gap: var(--space-md); }
.skyadmin-flex--gap-lg { gap: var(--space-lg); }

/* ========================================
   COMPONENT STYLES
   ======================================== */

/* Card Component */
.skyadmin-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.skyadmin-card:hover {
  box-shadow: var(--shadow-lg);
}

.skyadmin-card__header {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
  color: white;
}

.skyadmin-card__body {
  padding: var(--space-lg);
}

.skyadmin-card__footer {
  padding: var(--space-lg);
  background: var(--neutral-50);
  border-top: 1px solid var(--neutral-200);
}

/* Button System */
.skyadmin-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.skyadmin-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button Variants */
.skyadmin-button--primary {
  background: var(--primary-600);
  color: white;
  border-color: var(--primary-600);
}

.skyadmin-button--primary:hover:not(:disabled) {
  background: var(--primary-700);
  border-color: var(--primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.skyadmin-button--secondary {
  background: white;
  color: var(--primary-600);
  border-color: var(--primary-600);
}

.skyadmin-button--secondary:hover:not(:disabled) {
  background: var(--primary-50);
}

.skyadmin-button--success {
  background: var(--success-500);
  color: white;
  border-color: var(--success-500);
}

.skyadmin-button--warning {
  background: var(--warning-500);
  color: white;
  border-color: var(--warning-500);
}

.skyadmin-button--error {
  background: var(--error-500);
  color: white;
  border-color: var(--error-500);
}

/* Button Sizes */
.skyadmin-button--sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-xs);
}

.skyadmin-button--lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-lg);
}

/* Form Elements */
.skyadmin-form-group {
  margin-bottom: var(--space-lg);
}

.skyadmin-form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--neutral-700);
}

.skyadmin-form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--neutral-900);
  background: white;
  border: 1px solid var(--neutral-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.skyadmin-form-input:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

.skyadmin-form-input:invalid {
  border-color: var(--error-500);
}

.skyadmin-form-input:invalid:focus {
  box-shadow: 0 0 0 3px rgb(239 68 68 / 0.1);
}

/* ========================================
   RESPONSIVE UTILITIES
   ======================================== */

/* Hide/Show on different screens */
.skyadmin-hidden { display: none !important; }
.skyadmin-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 767px) {
  .skyadmin-hidden-mobile { display: none !important; }
}

@media (min-width: 768px) {
  .skyadmin-hidden-desktop { display: none !important; }
}

/* ========================================
   ACCESSIBILITY ENHANCEMENTS
   ======================================== */

/* Focus visible for keyboard navigation */
.skyadmin-button:focus-visible,
.skyadmin-form-input:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  .skyadmin-button {
    border-width: 2px;
  }
  
  .skyadmin-card {
    border: 2px solid var(--neutral-300);
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  .skyadmin-button,
  .skyadmin-form-input {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  
  .skyadmin-card {
    box-shadow: none;
    border: 1px solid var(--neutral-300);
  }
}