/**
 * Dinesafe Explorer - Main Stylesheet
 * Design System and Base Styles
 * Implements WCAG 2.1 AA accessibility standards
 */

/* ==========================================================================
   CSS Custom Properties (Design System)
   ========================================================================== */

:root {
  /* Color System */
  --color-primary: #2563eb;         /* Blue-600 */
  --color-primary-dark: #1d4ed8;    /* Blue-700 */
  --color-primary-light: #3b82f6;   /* Blue-500 */

  --color-secondary: #059669;       /* Emerald-600 */
  --color-secondary-dark: #047857;  /* Emerald-700 */
  --color-secondary-light: #10b981; /* Emerald-500 */

  /* Safety Status Colors */
  --color-pass: #22c55e;           /* Green-500 */
  --color-pass-bg: #dcfce7;        /* Green-100 */
  --color-pass-border: #bbf7d0;    /* Green-200 */

  --color-conditional: #f59e0b;    /* Amber-500 */
  --color-conditional-bg: #fef3c7; /* Amber-100 */
  --color-conditional-border: #fde68a; /* Amber-200 */

  --color-fail: #ef4444;           /* Red-500 */
  --color-fail-bg: #fee2e2;        /* Red-100 */
  --color-fail-border: #fecaca;    /* Red-200 */

  --color-unknown: #6b7280;        /* Gray-500 */
  --color-unknown-bg: #f3f4f6;     /* Gray-100 */
  --color-unknown-border: #e5e7eb; /* Gray-200 */

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Semantic Colors */
  --color-success: var(--color-pass);
  --color-warning: var(--color-conditional);
  --color-error: var(--color-fail);
  --color-info: var(--color-primary);

  /* Background Colors */
  --color-background: var(--color-white);
  --color-surface: var(--color-gray-50);
  --color-surface-elevated: var(--color-white);

  /* Text Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  --color-text-inverse: var(--color-white);

  /* Border Colors */
  --color-border: var(--color-gray-200);
  --color-border-light: var(--color-gray-100);
  --color-border-dark: var(--color-gray-300);

  /* Focus Colors */
  --color-focus: var(--color-primary);
  --color-focus-ring: rgba(37, 99, 235, 0.3);

  /* 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 */

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

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

  /* Font Families */
  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "SF Mono", Monaco, Inconsolata, "Roboto Mono", Consolas, "Courier New", monospace;

  /* Spacing Scale */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */

  /* 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-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

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

  /* Layout */
  --max-width-xs: 20rem;      /* 320px */
  --max-width-sm: 24rem;      /* 384px */
  --max-width-md: 28rem;      /* 448px */
  --max-width-lg: 32rem;      /* 512px */
  --max-width-xl: 36rem;      /* 576px */
  --max-width-2xl: 42rem;     /* 672px */
  --max-width-3xl: 48rem;     /* 768px */
  --max-width-4xl: 56rem;     /* 896px */
  --max-width-5xl: 64rem;     /* 1024px */
  --max-width-6xl: 72rem;     /* 1152px */
  --max-width-7xl: 80rem;     /* 1280px */

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* Breakpoints (for reference, actual media queries below) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
}

/* High Contrast Mode Overrides */
.high-contrast {
  --color-background: #ffffff;
  --color-surface: #ffffff;
  --color-text-primary: #000000;
  --color-text-secondary: #000000;
  --color-border: #000000;
  --color-focus: #0000ff;
  --color-focus-ring: rgba(0, 0, 255, 0.5);
}

/* Large Text Mode */
.large-text {
  --font-size-xs: 0.875rem;   /* 14px */
  --font-size-sm: 1rem;       /* 16px */
  --font-size-base: 1.125rem; /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */
  --font-size-4xl: 2.625rem;  /* 42px */
}

/* Reduced Motion */
.reduced-motion,
.reduce-motion {
  --transition-fast: 0ms;
  --transition-base: 0ms;
  --transition-slow: 0ms;
}

.reduced-motion *,
.reduce-motion * {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

/* ==========================================================================
   CSS Reset and Base Styles
   ========================================================================== */

/* Modern CSS Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

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

/* Remove default button styles */
button {
  background-color: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

/* Remove default input styles */
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Remove default list styles */
ul,
ol {
  list-style: none;
}

/* Remove default link styles */
a {
  color: inherit;
  text-decoration: none;
}

/* Improve media defaults */
img,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-4);
  line-height: var(--line-height-relaxed);
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

strong, b {
  font-weight: var(--font-weight-semibold);
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  background-color: var(--color-gray-100);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-base);
}

/* ==========================================================================
   Focus Management and Accessibility
   ========================================================================== */

/* Enhanced focus styles */
:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.keyboard-focus-visible :focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px var(--color-focus-ring);
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: 8px 16px;
  text-decoration: none;
  border-radius: var(--radius-base);
  z-index: var(--z-index-tooltip);
  font-weight: var(--font-weight-medium);
}

.skip-link:focus {
  top: 6px;
}

/* Screen reader only content */
.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;
}

/* ==========================================================================
   Button System
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px; /* WCAG touch target size */
  min-width: 44px;
}

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

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-gray-50);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-gray-50);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-gray-100);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--font-size-lg);
}

.btn-icon {
  padding: var(--spacing-2);
  width: 44px;
  height: 44px;
}

/* ==========================================================================
   Form Controls
   ========================================================================== */

.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.form-input {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  color: var(--color-text-primary);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  min-height: 44px; /* WCAG touch target size */
}

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

.form-input:disabled {
  background-color: var(--color-gray-100);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* Checkbox and Radio */
.form-checkbox,
.form-radio {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  background-color: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.form-checkbox {
  border-radius: var(--radius-base);
}

.form-radio {
  border-radius: var(--radius-full);
}

.form-checkbox:checked,
.form-radio:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-checkbox:checked::after {
  content: '';
  position: absolute;
  top: 1px;
  left: 5px;
  width: 6px;
  height: 10px;
  border: solid var(--color-white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-radio:checked::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-white);
}

/* ==========================================================================
   Badge System
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.badge-pass {
  background-color: var(--color-pass-bg);
  color: var(--color-pass);
  border: 1px solid var(--color-pass-border);
}

.badge-conditional {
  background-color: var(--color-conditional-bg);
  color: var(--color-conditional);
  border: 1px solid var(--color-conditional-border);
}

.badge-fail {
  background-color: var(--color-fail-bg);
  color: var(--color-fail);
  border: 1px solid var(--color-fail-border);
}

.badge-unknown {
  background-color: var(--color-unknown-bg);
  color: var(--color-unknown);
  border: 1px solid var(--color-unknown-border);
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width-7xl);
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* Flexbox utilities */
.flex {
  display: flex;
}

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

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

.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;
}

/* Grid utilities */
.grid {
  display: grid;
}

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

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

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

.gap-2 {
  gap: var(--spacing-2);
}

.gap-4 {
  gap: var(--spacing-4);
}

.gap-6 {
  gap: var(--spacing-6);
}

/* Spacing utilities */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-4 { margin: var(--spacing-4); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-4 { padding: var(--spacing-4); }

.px-0 { padding-left: 0; padding-right: 0; }
.px-2 { padding-left: var(--spacing-2); padding-right: var(--spacing-2); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-2 { padding-top: var(--spacing-2); padding-bottom: var(--spacing-2); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }

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

.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); }

/* Display utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (min-width: 640px) {
  .sm\:text-lg { font-size: var(--font-size-lg); }
  .sm\:text-xl { font-size: var(--font-size-xl); }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:flex-row { flex-direction: row; }
}

@media (min-width: 768px) {
  .md\:text-xl { font-size: var(--font-size-xl); }
  .md\:text-2xl { font-size: var(--font-size-2xl); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:px-6 { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }
  .md\:py-6 { padding-top: var(--spacing-6); padding-bottom: var(--spacing-6); }
}

@media (min-width: 1024px) {
  .lg\:text-2xl { font-size: var(--font-size-2xl); }
  .lg\:text-3xl { font-size: var(--font-size-3xl); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:px-8 { padding-left: var(--spacing-8); padding-right: var(--spacing-8); }
  .lg\:py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }
}

/* ==========================================================================
   Animation and Transitions
   ========================================================================== */

.transition-all {
  transition: all var(--transition-base);
}

.transition-colors {
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
}

.transition-opacity {
  transition: opacity var(--transition-base);
}

.transition-transform {
  transition: transform var(--transition-base);
}

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

.animate-spin {
  animation: spin 1s linear infinite;
}

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

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Fade in animation */
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-fade-in {
  animation: fade-in var(--transition-base) ease-out;
}

/* Slide down animation */
@keyframes slide-down {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-slide-down {
  animation: slide-down var(--transition-base) ease-out;
}

/* ==========================================================================
   Map Marker Clustering (Performance Optimization)
   ========================================================================== */

.marker-cluster-container {
  background: transparent;
}

.marker-cluster {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  text-align: center;
  line-height: 40px;
  font-weight: bold;
  font-size: 14px;
  border: 3px solid var(--color-white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.marker-cluster:hover {
  transform: scale(1.1);
  background: var(--color-primary-dark);
}

.marker-cluster-large {
  background: var(--color-fail);
}

.marker-cluster-large:hover {
  background: var(--color-fail);
  filter: brightness(0.9);
}