:root {
  /* Halle.de inspired Color Palette */
  /* Primary Colors - Rot/Bordeaux von Halle */
  --ds-color-primary: #9B2743;
  --ds-color-primary-light: #C13458;
  --ds-color-primary-dark: #7A1F36;
  --ds-color-primary-50: #FEF2F4;
  --ds-color-primary-100: #FCE4E8;
  --ds-color-primary-200: #FACCD6;
  --ds-color-primary-300: #F5A3B6;
  --ds-color-primary-400: #EE6D8A;
  --ds-color-primary-500: #E23D63;
  --ds-color-primary-600: #CD1F49;
  --ds-color-primary-700: #9B2743;
  --ds-color-primary-800: #7A1F36;
  --ds-color-primary-900: #5C1829;
  
  /* Secondary Colors - Gold/Gelb von Halle */
  --ds-color-secondary: #D4AF37;
  --ds-color-secondary-light: #E8C968;
  --ds-color-secondary-dark: #B8941F;
  --ds-color-accent: #F0B323;
  --ds-color-accent-light: #FFD966;
  
  /* Neutral Colors - Graustufen */
  --ds-color-gray-50: #FAFAFA;
  --ds-color-gray-100: #F5F5F5;
  --ds-color-gray-200: #E5E5E5;
  --ds-color-gray-300: #D4D4D4;
  --ds-color-gray-400: #A3A3A3;
  --ds-color-gray-500: #737373;
  --ds-color-gray-600: #525252;
  --ds-color-gray-700: #404040;
  --ds-color-gray-800: #262626;
  --ds-color-gray-900: #171717;
  
  /* Surface Colors */
  --ds-color-surface: #FFFFFF;
  --ds-color-surface-dark: #0A0A0A;
  --ds-color-background: #FAFAFA;
  --ds-color-border: #E5E5E5;
  
  /* Semantic Colors */
  --ds-color-success: #10B981;
  --ds-color-success-light: #D1FAE5;
  --ds-color-success-dark: #065F46;
  
  --ds-color-warning: #F59E0B;
  --ds-color-warning-light: #FEF3C7;
  --ds-color-warning-dark: #92400E;
  
  --ds-color-error: #EF4444;
  --ds-color-error-light: #FEE2E2;
  --ds-color-error-dark: #991B1B;
  
  --ds-color-info: #3B82F6;
  --ds-color-info-light: #DBEAFE;
  --ds-color-info-dark: #1E40AF;

  /* Typography */
  --ds-font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ds-font-family-heading: "Georgia", "Times New Roman", serif;
  
  --ds-font-weight-normal: 400;
  --ds-font-weight-medium: 500;
  --ds-font-weight-semibold: 600;
  --ds-font-weight-bold: 700;
  
  --ds-font-size-xs: 0.75rem;      /* 12px */
  --ds-font-size-sm: 0.875rem;     /* 14px */
  --ds-font-size-base: 1rem;       /* 16px */
  --ds-font-size-lg: 1.125rem;     /* 18px */
  --ds-font-size-xl: 1.25rem;      /* 20px */
  --ds-font-size-2xl: 1.5rem;      /* 24px */
  --ds-font-size-3xl: 1.875rem;    /* 30px */
  --ds-font-size-4xl: 2.25rem;     /* 36px */
  --ds-font-size-5xl: 3rem;        /* 48px */
  
  --ds-line-height-tight: 1.25;
  --ds-line-height-normal: 1.5;
  --ds-line-height-relaxed: 1.75;

  /* Spacing Scale (8px base) */
  --ds-spacing-2xs: 0.25rem;   /* 4px */
  --ds-spacing-xs: 0.5rem;     /* 8px */
  --ds-spacing-sm: 0.75rem;    /* 12px */
  --ds-spacing-md: 1rem;       /* 16px */
  --ds-spacing-lg: 1.5rem;     /* 24px */
  --ds-spacing-xl: 2rem;       /* 32px */
  --ds-spacing-2xl: 3rem;      /* 48px */
  --ds-spacing-3xl: 4rem;      /* 64px */
  --ds-spacing-4xl: 6rem;      /* 96px */

  /* Border Radius */
  --ds-radius-sm: 0.25rem;     /* 4px */
  --ds-radius-md: 0.5rem;      /* 8px */
  --ds-radius-lg: 0.75rem;     /* 12px */
  --ds-radius-xl: 1rem;        /* 16px */
  --ds-radius-2xl: 1.5rem;     /* 24px */
  --ds-radius-full: 9999px;

  /* Shadows */
  --ds-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --ds-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --ds-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --ds-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --ds-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Z-Index Scale */
  --ds-z-base: 0;
  --ds-z-dropdown: 1000;
  --ds-z-sticky: 1020;
  --ds-z-header: 1030;
  --ds-z-overlay: 1040;
  --ds-z-modal: 1050;
  --ds-z-popover: 1060;
  --ds-z-tooltip: 1070;

  /* Transitions */
  --ds-transition-fast: 150ms ease-in-out;
  --ds-transition-normal: 250ms ease-in-out;
  --ds-transition-slow: 350ms ease-in-out;

  /* Focus Ring */
  --ds-focus-ring-width: 2px;
  --ds-focus-ring-offset: 2px;
  --ds-focus-ring-color: var(--ds-color-primary);

  /* Alias Theme Tokens (for components using --color-*) */
  --color-bg: var(--ds-color-surface);
  --color-bg-secondary: var(--ds-color-background);
  --color-border: var(--ds-color-border);
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-text: var(--ds-color-gray-900);
  --color-text-secondary: var(--ds-color-gray-700);
  --color-primary: var(--ds-color-primary);

  /* DS Text Aliases (some pages reference these names) */
  --ds-color-text: var(--color-text);
  --ds-color-text-secondary: var(--color-text-secondary);
  --ds-color-primary-hover: var(--ds-color-primary-dark);
}

/* Dark Mode */
.dark,
[data-theme="dark"] {
  /* Surfaces and borders in dark mode */
  --ds-color-surface: #0a0a0a;       /* near-black surface */
  --ds-color-background: #000000;    /* pure black background */
  --ds-color-border: #262626;

  /* Inverted Grays for Dark Mode (so tokens map intuitively for existing usage) */
  --ds-color-gray-50: #0a0a0a;
  --ds-color-gray-100: #171717;
  --ds-color-gray-200: #262626;
  --ds-color-gray-300: #404040;
  --ds-color-gray-400: #525252;
  --ds-color-gray-500: #737373;
  --ds-color-gray-600: #a3a3a3;
  --ds-color-gray-700: #d4d4d4;
  --ds-color-gray-800: #e5e5e5;
  --ds-color-gray-900: #fafafa;

  /* Primary colors tuned for dark mode (slightly brighter) */
  --ds-color-primary: #E23D63;
  --ds-color-primary-light: #F5528B;
  --ds-color-primary-dark: #C13458;

  /* Alias overrides for dark mode */
  --color-bg: var(--ds-color-surface);
  --color-bg-secondary: #111111; /* darker secondary panels */
  --color-border: var(--ds-color-border);
  --color-shadow: rgba(0, 0, 0, 0.5);
  --color-text: var(--ds-color-gray-900);           /* WHITE text on black */
  --color-text-secondary: var(--ds-color-gray-600); /* readable secondary */
  --color-primary: var(--ds-color-primary);

  /* DS text aliases in dark mode */
  --ds-color-text: var(--color-text);
  --ds-color-text-secondary: var(--color-text-secondary);
  --ds-color-primary-hover: var(--ds-color-primary-light);
}

/* Accessibility Styles */
:focus-visible {
  outline: var(--ds-focus-ring-width) solid var(--ds-focus-ring-color);
  outline-offset: var(--ds-focus-ring-offset);
}

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ds-color-primary);
  color: white;
  padding: var(--ds-spacing-xs) var(--ds-spacing-md);
  text-decoration: none;
  z-index: var(--ds-z-tooltip);
  border-radius: 0 0 var(--ds-radius-md) 0;
  font-weight: var(--ds-font-weight-semibold);
  transition: top var(--ds-transition-fast);
}

.skip-to-content:focus {
  top: 0;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --ds-color-border: #000000;
    --ds-focus-ring-width: 3px;
  }
}

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

/* Print Styles */
@media print {
  * {
    color: #000 !important;
    background: #fff !important;
  }
}

/* Performance Optimizations */
/* Use CSS containment for independent components */
.header,
.footer,
.service-card,
.testimonial-card,
.process-step,
.stat-card {
  contain: layout style;
}

/* Optimize animations with will-change (use sparingly) */
.btn:hover,
.back-to-top.visible,
.nav-links a:hover {
  will-change: transform;
}

/* Remove will-change after animation */
.btn,
.back-to-top,
.nav-links a {
  will-change: auto;
}

/* Content-visibility for off-screen content (experimental but great for performance) */
@supports (content-visibility: auto) {
  .footer,
  .testimonials,
  .process {
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
  }
}