/**
 * Photo Uploader Design System
 * Modern, accessible design system with comprehensive theming support
 */

/* ===== DESIGN TOKENS ===== */
:root {
  /* Color Palette - Primary */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;
  --color-primary-950: #172554;

  /* Color Palette - Neutral */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #f9fafb;
  --color-neutral-100: #f3f4f6;
  --color-neutral-200: #e5e7eb;
  --color-neutral-300: #d1d5db;
  --color-neutral-400: #9ca3af;
  --color-neutral-500: #6b7280;
  --color-neutral-600: #4b5563;
  --color-neutral-700: #374151;
  --color-neutral-800: #1f2937;
  --color-neutral-900: #111827;
  --color-neutral-950: #030712;

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

  --color-warning-50: #fffbeb;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;

  --color-error-50: #fef2f2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  --color-info-50: #f0f9ff;
  --color-info-500: #06b6d4;
  --color-info-600: #0891b2;
  --color-info-700: #0e7490;

  /* Typography Scale */
  --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 Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing Scale (8px grid) */
  --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 */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;    /* 2px */
  --radius-base: 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;

  /* Shadows */
  --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);

  /* Animation Durations */
  --duration-75: 75ms;
  --duration-100: 100ms;
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  --duration-500: 500ms;
  --duration-700: 700ms;
  --duration-1000: 1000ms;

  /* Animation Easings */
  --ease-linear: linear;
  --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);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Z-Index Scale - Sensible Values */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-tooltip: 300;
  --z-modal: 400;
  --z-crop-modal: 500;
  --z-help-modal: 600;
  --z-confirmation: 700;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

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

/* ===== DARK MODE SUPPORT (DISABLED BY DEFAULT) ===== */
/* 
 * Dark mode is disabled by default to prevent automatic color conflicts.
 * To enable dark mode, add the class 'photo-uploader-dark-mode' to the container.
 */
.photo-uploader-dark-mode {
  --color-neutral-0: #030712;
  --color-neutral-50: #111827;
  --color-neutral-100: #1f2937;
  --color-neutral-200: #374151;
  --color-neutral-300: #4b5563;
  --color-neutral-400: #6b7280;
  --color-neutral-500: #9ca3af;
  --color-neutral-600: #d1d5db;
  --color-neutral-700: #e5e7eb;
  --color-neutral-800: #f3f4f6;
  --color-neutral-900: #f9fafb;
  --color-neutral-950: #ffffff;
}

/* Optional: Enable automatic dark mode only when explicitly requested */
@media (prefers-color-scheme: dark) {
  .photo-uploader-auto-dark-mode {
    --color-neutral-0: #030712;
    --color-neutral-50: #111827;
    --color-neutral-100: #1f2937;
    --color-neutral-200: #374151;
    --color-neutral-300: #4b5563;
    --color-neutral-400: #6b7280;
    --color-neutral-500: #9ca3af;
    --color-neutral-600: #d1d5db;
    --color-neutral-700: #e5e7eb;
    --color-neutral-800: #f3f4f6;
    --color-neutral-900: #f9fafb;
    --color-neutral-950: #ffffff;
  }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
  :root {
    --color-primary-500: #0000ff;
    --color-success-500: #008000;
    --color-error-500: #ff0000;
    --color-warning-500: #ff8c00;
    --color-neutral-300: #000000;
    --color-neutral-700: #ffffff;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-75: 0ms;
    --duration-100: 0ms;
    --duration-150: 0ms;
    --duration-200: 0ms;
    --duration-300: 0ms;
    --duration-500: 0ms;
    --duration-700: 0ms;
    --duration-1000: 0ms;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== UTILITY CLASSES ===== */

/* Spacing Utilities */
.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-0 { margin: var(--space-0); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

/* Text Utilities */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Color Utilities */
.text-neutral-500 { color: var(--color-neutral-500); }
.text-neutral-600 { color: var(--color-neutral-600); }
.text-neutral-700 { color: var(--color-neutral-700); }
.text-neutral-800 { color: var(--color-neutral-800); }
.text-neutral-900 { color: var(--color-neutral-900); }

.text-primary-500 { color: var(--color-primary-500); }
.text-primary-600 { color: var(--color-primary-600); }
.text-primary-700 { color: var(--color-primary-700); }

.text-success-500 { color: var(--color-success-500); }
.text-error-500 { color: var(--color-error-500); }
.text-warning-500 { color: var(--color-warning-500); }

/* Background Utilities */
.bg-white { background-color: var(--color-neutral-0); }
.bg-neutral-50 { background-color: var(--color-neutral-50); }
.bg-neutral-100 { background-color: var(--color-neutral-100); }
.bg-neutral-200 { background-color: var(--color-neutral-200); }

.bg-primary-50 { background-color: var(--color-primary-50); }
.bg-primary-500 { background-color: var(--color-primary-500); }
.bg-primary-600 { background-color: var(--color-primary-600); }

/* Border Utilities */
.border { border: 1px solid var(--color-neutral-200); }
.border-2 { border: 2px solid var(--color-neutral-200); }
.border-primary { border-color: var(--color-primary-500); }
.border-success { border-color: var(--color-success-500); }
.border-error { border-color: var(--color-error-500); }

.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow Utilities */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

/* Flexbox Utilities */
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

/* Gap Utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Position Utilities */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Overflow Utilities */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-scroll { overflow: scroll; }

/* Transition Utilities */
.transition { transition: all var(--duration-150) var(--ease-in-out); }
.transition-colors { transition: color var(--duration-150) var(--ease-in-out), background-color var(--duration-150) var(--ease-in-out), border-color var(--duration-150) var(--ease-in-out); }
.transition-transform { transition: transform var(--duration-150) var(--ease-in-out); }
.transition-opacity { transition: opacity var(--duration-150) var(--ease-in-out); }

/* Transform Utilities */
.scale-95 { transform: scale(0.95); }
.scale-100 { transform: scale(1); }
.scale-105 { transform: scale(1.05); }
.scale-110 { transform: scale(1.1); }

.translate-y-1 { transform: translateY(var(--space-1)); }
.translate-y-2 { transform: translateY(var(--space-2)); }
.-translate-y-1 { transform: translateY(calc(-1 * var(--space-1))); }
.-translate-y-2 { transform: translateY(calc(-1 * var(--space-2))); }

/* Opacity Utilities */
.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Width/Height Utilities */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-0 { min-height: 0; }
.max-w-none { max-width: none; }

/* ===== RESPONSIVE UTILITIES ===== */
@media (min-width: 640px) {
  .sm\:text-lg { font-size: var(--font-size-lg); }
  .sm\:p-6 { padding: var(--space-6); }
  .sm\:gap-6 { gap: var(--space-6); }
}

@media (min-width: 768px) {
  .md\:text-xl { font-size: var(--font-size-xl); }
  .md\:p-8 { padding: var(--space-8); }
  .md\:gap-8 { gap: var(--space-8); }
  .md\:flex-row { flex-direction: row; }
}

@media (min-width: 1024px) {
  .lg\:text-2xl { font-size: var(--font-size-2xl); }
  .lg\:p-10 { padding: var(--space-10); }
  .lg\:gap-10 { gap: var(--space-10); }
}

/* ===== FOCUS STYLES ===== */
.focus-ring {
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.focus-ring:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.focus-ring:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* ===== ANIMATION KEYFRAMES ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(var(--space-4));
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(calc(-1 * var(--space-4)));
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(-25%);
    animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
  }
  50% {
    transform: translateY(0);
    animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
  }
}

/* ===== ANIMATION UTILITIES ===== */
.animate-fadeIn { animation: fadeIn var(--duration-300) var(--ease-out); }
.animate-slideInUp { animation: slideInUp var(--duration-300) var(--ease-out); }
.animate-scaleIn { animation: scaleIn var(--duration-200) var(--ease-out); }
.animate-pulse { animation: pulse var(--duration-1000) var(--ease-in-out) infinite; }
.animate-spin { animation: spin var(--duration-1000) linear infinite; }
.animate-bounce { animation: bounce var(--duration-1000) infinite; }