/* ==========================================
   DESIGN TOKENS - S-Tier SaaS Foundation
   ========================================== */

:root {
  /* Color Palette - WCAG AA Compliant */
  --color-primary: #2563eb;         /* Blue - 5.9:1 contrast on white */
  --color-primary-hover: #1d4ed8;   /* Darker blue - 7.4:1 contrast on white */
  --color-primary-dark: #1e3a8a;    /* Dark blue - 10.2:1 contrast on white */
  
  --color-secondary: #95a5a6;
  --color-secondary-hover: #7f8c8d;
  --color-secondary-dark: #6c7b7d;
  
  --color-accent: #e74c3c;
  --color-accent-hover: #c0392b;
  
  --color-success: #27ae60;
  --color-success-bg: #d4edda;
  --color-success-border: #c3e6cb;
  --color-success-text: #155724;
  
  --color-error: #e74c3c;
  --color-error-bg: #f8d7da;
  --color-error-border: #f5c6cb;
  --color-error-text: #721c24;
  
  --color-warning: #f39c12;
  --color-info: #3498db;
  
  /* Neutral Colors */
  --color-neutral-50: #f8f9fa;
  --color-neutral-100: #f1f3f4;
  --color-neutral-200: #dee2e6;
  --color-neutral-300: #ced4da;
  --color-neutral-400: #adb5bd;
  --color-neutral-500: #6c757d;
  --color-neutral-600: #495057;
  --color-neutral-700: #343a40;
  --color-neutral-800: #212529;
  --color-neutral-900: #000000;
  
  --color-white: #ffffff;
  --color-black: #000000;
  
  /* Background Colors */
  --color-bg-primary: #306eb3;
  --color-bg-card: rgba(255, 255, 255, 0.95);
  --color-bg-modal: rgba(0, 0, 0, 0.8);
  --color-bg-overlay: rgba(0, 0, 0, 0.9);
  
  /* Text Colors - WCAG AA Compliant */
  --color-text-primary: #212529;    /* Dark gray - 16.75:1 contrast on white */
  --color-text-secondary: #495057;  /* Medium gray - 8.59:1 contrast on white */
  --color-text-muted: #6c757d;      /* Light gray - 5.74:1 contrast on white */
  --color-text-white: #ffffff;
  
  /* Spacing Scale (8px base unit) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-4xl: 40px;
  --space-5xl: 48px;
  --space-6xl: 64px;
  
  /* Typography Scale */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  
  --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-size-5xl: 3rem;     /* 48px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Border Radius */
  --border-radius-xs: 2px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-2xl: 20px;
  --border-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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* 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;
}

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

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

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  min-height: 100vh;
  padding: var(--space-xl);
}

/* ==========================================
   COMPONENT CLASSES
   ========================================== */

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
}

/* Header */
.header {
  background: linear-gradient(45deg, var(--color-text-primary), #34495e);
  color: var(--color-text-white);
  padding: var(--space-4xl);
  text-align: center;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.cloudflare-logo {
  background: var(--color-white);
  padding: var(--space-lg);
  border-radius: var(--space-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.header-text {
  text-align: center;
}

.header h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-semibold);
}

.header p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

/* Content */
.content {
  padding: var(--space-4xl);
}

/* Turnstile Protection Overlay */
.turnstile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-modal);
  backdrop-filter: blur(10px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
}

.turnstile-card {
  background: var(--color-white);
  padding: var(--space-4xl);
  border-radius: var(--border-radius-2xl);
  max-width: 500px;
  margin: var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-2xl);
}

.turnstile-card h2 {
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

.turnstile-card p {
  margin-bottom: var(--space-2xl);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.turnstile-widget {
  margin: var(--space-2xl) 0;
  display: flex;
  justify-content: center;
}

/* Verification Status */
.verification-status {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-semibold);
}

.verification-success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid var(--color-success-border);
}

.verification-error {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  border: 1px solid var(--color-error-border);
}

/* Stats */
.stats {
  background: linear-gradient(45deg, var(--color-accent), var(--color-accent-hover));
  color: var(--color-text-white);
  padding: var(--space-xl);
  margin: var(--space-3xl) 0;
  border-radius: var(--border-radius-lg);
  text-align: center;
}

.stats h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-lg);
  font-weight: var(--font-weight-semibold);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.stat-item {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--space-lg);
  border-radius: var(--border-radius-md);
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

/* Diagram Grid */
.diagram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--space-3xl);
  margin-top: var(--space-xl);
}

/* Diagram Cards */
.diagram-card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.diagram-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-2xl);
}

.diagram-card:focus-within {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.diagram-header {
  background: linear-gradient(45deg, var(--color-primary), var(--color-primary-hover));
  color: var(--color-text-white);
  padding: var(--space-xl);
  text-align: center;
}

.diagram-header h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
  font-weight: var(--font-weight-semibold);
}

.diagram-header .format {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius-full);
  display: inline-block;
}

.diagram-content {
  padding: var(--space-xl);
  text-align: center;
}

.diagram-preview {
  max-width: 100%;
  height: 300px;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--space-xl);
  background: var(--color-neutral-50);
  border: 2px dashed var(--color-neutral-200);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.diagram-preview:hover {
  border-color: var(--color-primary);
  background: #f0f8ff;
}

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

.diagram-preview img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.diagram-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  padding: var(--space-lg) var(--space-2xl);
  border: none;
  border-radius: var(--border-radius-full);
  cursor: pointer;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  transition: all var(--transition-base);
  font-size: var(--font-size-sm);
  font-family: inherit;
}

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

.btn-primary {
  background: linear-gradient(45deg, var(--color-primary), var(--color-primary-hover));
  color: var(--color-text-white);
}

.btn-primary:hover {
  background: linear-gradient(45deg, var(--color-primary-hover), var(--color-primary-dark));
  transform: translateY(-2px);
}

.btn-primary:focus {
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
  background: linear-gradient(45deg, var(--color-secondary), var(--color-secondary-hover));
  color: var(--color-text-white);
}

.btn-secondary:hover {
  background: linear-gradient(45deg, var(--color-secondary-hover), var(--color-secondary-dark));
  transform: translateY(-2px);
}

.btn-secondary:focus {
  box-shadow: 0 0 0 3px rgba(149, 165, 166, 0.3);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: var(--z-modal);
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-overlay);
}

.modal-content {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--space-xl);
}

.modal img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
}

.close {
  position: absolute;
  top: var(--space-xl);
  right: var(--space-4xl);
  color: var(--color-text-white);
  font-size: 40px;
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  z-index: var(--z-tooltip);
  transition: opacity var(--transition-fast);
}

.close:hover,
.close:focus {
  opacity: 0.7;
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

/* Footer */
.footer {
  background: var(--color-text-primary);
  color: var(--color-text-white);
  text-align: center;
  padding: var(--space-xl);
  font-size: var(--font-size-sm);
  opacity: 0.8;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.footer-logo {
  width: 20px;
  height: 20px;
  opacity: 0.7;
}

/* Hidden content until verification */
.protected-content {
  display: none;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

@media (max-width: 768px) {
  .diagram-grid {
    grid-template-columns: 1fr;
  }
  
  .header h1 {
    font-size: var(--font-size-3xl);
  }
  
  .content {
    padding: var(--space-xl);
  }

  .turnstile-card {
    padding: var(--space-3xl) var(--space-xl);
    margin: var(--space-md);
  }
  
  body {
    padding: var(--space-md);
  }
  
  .header {
    padding: var(--space-3xl);
  }
  
  .header-content {
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  .diagram-actions {
    flex-direction: column;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .header h1 {
    font-size: var(--font-size-2xl);
  }
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0056b3;
    --color-bg-card: #ffffff;
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.3);
  }
}

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

/* Focus styles for better keyboard navigation */
*:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px;
  z-index: var(--z-tooltip);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
}

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