/**
 * QueueFlow Design System
 * Version: 1.0.0
 *
 * A comprehensive design token system for consistent UI across all pages.
 * Import this file before site.css in your layout.
 */

/* ============================================
   1. COLOR TOKENS
   ============================================ */
:root {
  /* Primary Palette - Slate (Authority & Trust) */
  --color-slate-50: #f8fafc;
  --color-slate-100: #f1f5f9;
  --color-slate-200: #e2e8f0;
  --color-slate-300: #cbd5e1;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1e293b;
  --color-slate-900: #0f172a;
  --color-slate-950: #020617;

  /* Accent Palette - Blue (Action & Focus) */
  --color-blue-50: #eff6ff;
  --color-blue-100: #dbeafe;
  --color-blue-200: #bfdbfe;
  --color-blue-300: #93c5fd;
  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-blue-700: #1d4ed8;
  --color-blue-800: #1e40af;
  --color-blue-900: #1e3a8a;

  /* Semantic Colors */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

  --color-warning-50: #fefce8;
  --color-warning-100: #fef9c3;
  --color-warning-500: #eab308;
  --color-warning-600: #ca8a04;
  --color-warning-700: #a16207;

  --color-danger-50: #fef2f2;
  --color-danger-100: #fee2e2;
  --color-danger-500: #ef4444;
  --color-danger-600: #dc2626;
  --color-danger-700: #b91c1c;

  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;
  --color-info-700: #1d4ed8;
}

/* ============================================
   2. SPACING TOKENS
   ============================================ */
:root {
  --space-0: 0;
  --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 */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
}

/* ============================================
   3. TYPOGRAPHY TOKENS
   ============================================ */
:root {
  /* Font Families */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;

  /* Font Sizes */
  --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 */
  --text-5xl: 3rem;       /* 48px */

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Letter Spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
}

/* ============================================
   4. SHADOW TOKENS
   ============================================ */
:root {
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* Colored shadows for focus states */
  --shadow-focus: 0 0 0 3px rgb(37 99 235 / 0.25);
  --shadow-focus-danger: 0 0 0 3px rgb(239 68 68 / 0.25);
  --shadow-focus-success: 0 0 0 3px rgb(34 197 94 / 0.25);
}

/* ============================================
   5. BORDER RADIUS TOKENS
   ============================================ */
:root {
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-3xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;
}

/* ============================================
   6. TRANSITION TOKENS
   ============================================ */
:root {
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;

  /* Easing functions */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   7. Z-INDEX TOKENS
   ============================================ */
:root {
  --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;
}

/* ============================================
   8. COMPONENT TOKENS
   ============================================ */
:root {
  /* Buttons */
  --btn-padding-x: var(--space-4);
  --btn-padding-y: var(--space-2);
  --btn-font-size: var(--text-sm);
  --btn-font-weight: var(--font-medium);
  --btn-border-radius: var(--radius-lg);
  --btn-transition: all var(--transition-fast);

  /* Inputs */
  --input-padding-x: var(--space-3);
  --input-padding-y: var(--space-2);
  --input-font-size: var(--text-base);
  --input-border-radius: var(--radius-lg);
  --input-border-color: var(--color-slate-300);
  --input-border-focus: var(--color-blue-500);
  --input-bg: white;
  --input-placeholder: var(--color-slate-400);

  /* Cards */
  --card-padding: var(--space-6);
  --card-border-radius: var(--radius-xl);
  --card-shadow: var(--shadow-sm);
  --card-border: 1px solid var(--color-slate-200);
  --card-bg: white;

  /* Badges */
  --badge-padding-x: var(--space-2);
  --badge-padding-y: var(--space-1);
  --badge-font-size: var(--text-xs);
  --badge-font-weight: var(--font-medium);
  --badge-border-radius: var(--radius-full);
}

/* ============================================
   9. LAYOUT TOKENS
   ============================================ */
:root {
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  --sidebar-width: 280px;
  --header-height: 64px;
  --footer-height: auto;
}

/* ============================================
   10. UTILITY CLASSES
   ============================================ */

/* Focus visible for accessibility */
.focus-visible:focus-visible,
*:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-blue-600);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-slate-300);
  border-top-color: var(--color-blue-600);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg,
    var(--color-slate-200) 25%,
    var(--color-slate-100) 50%,
    var(--color-slate-200) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
}

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

/* ============================================
   11. FORM VALIDATION STYLES
   ============================================ */

/* Valid input state */
.form-control.is-valid,
.was-validated .form-control:valid {
  border-color: var(--color-success-500);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2322c55e' d='M2.3 6.73.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right calc(0.375em + 0.1875rem) center;
  background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
  padding-right: calc(1.5em + 0.75rem);
}

.form-control.is-valid:focus,
.was-validated .form-control:valid:focus {
  border-color: var(--color-success-500);
  box-shadow: var(--shadow-focus-success);
}

/* Invalid input state */
.form-control.is-invalid,
.was-validated .form-control:invalid {
  border-color: var(--color-danger-500);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23ef4444'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23ef4444' stroke='none'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right calc(0.375em + 0.1875rem) center;
  background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
  padding-right: calc(1.5em + 0.75rem);
}

.form-control.is-invalid:focus,
.was-validated .form-control:invalid:focus {
  border-color: var(--color-danger-500);
  box-shadow: var(--shadow-focus-danger);
}

/* Validation feedback messages */
.valid-feedback {
  display: none;
  width: 100%;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-success-600);
}

.invalid-feedback {
  display: none;
  width: 100%;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-danger-600);
}

.was-validated .form-control:valid ~ .valid-feedback,
.form-control.is-valid ~ .valid-feedback {
  display: block;
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
  display: block;
}

/* ============================================
   12. RESPONSIVE BREAKPOINTS
   ============================================ */

/* Mobile first approach - base styles are for mobile */
/* Use these media queries to add styles for larger screens */

/* sm: 640px and up */
@media (min-width: 640px) {
  :root {
    --text-base: 1rem;
  }
}

/* md: 768px and up */
@media (min-width: 768px) {
  :root {
    --card-padding: var(--space-8);
  }
}

/* lg: 1024px and up */
@media (min-width: 1024px) {
  :root {
    --sidebar-width: 300px;
  }
}

/* xl: 1280px and up */
@media (min-width: 1280px) {
  /* Add larger screen overrides */
}

/* 2xl: 1536px and up */
@media (min-width: 1536px) {
  /* Add extra large screen overrides */
}

/* ============================================
   13. PRINT STYLES
   ============================================ */
@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  abbr[title]::after {
    content: " (" attr(title) ")";
  }

  pre,
  blockquote {
    border: 1px solid #999;
    page-break-inside: avoid;
  }

  thead {
    display: table-header-group;
  }

  tr,
  img {
    page-break-inside: avoid;
  }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }

  .no-print {
    display: none !important;
  }
}

/* ============================================
   14. REDUCED MOTION
   ============================================ */
@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;
  }
}