:root {
    /* Colors from IPG Mediabrands Palette */
    --color-rich-black: #000000;
    /* Rich Black */
    --color-pure-black: #1d1d1f;
    /* Pure Black */
    --color-darkest-grey: #434344;
    /* Darkest Grey */
    --color-dark-grey: #68696a;
    /* Dark Grey */
    --color-grey: #8e8f8f;
    /* Grey */
    --color-light-grey: #b3b5b5;
    /* Light Grey */
    --color-lightest-grey: #d9dbda;
    /* Lightest Grey */
    --color-white: #ffffff;
    /* White */

    /* Semantic Color Mapping */
    --color-primary: var(--color-pure-black);
    --color-primary-dark: var(--color-rich-black);
    --color-primary-rgb: 29, 29, 31; /* RGB values for rgba() usage */
    --color-black: var(--color-rich-black);
    --color-gray-50: var(--color-lightest-grey);
    --color-gray-100: var(--color-light-grey);
    --color-gray-200: var(--color-grey);
    --color-gray-600: var(--color-dark-grey);
    --color-text: var(--color-pure-black);
    --color-text-secondary: var(--color-dark-grey);
    --color-background: var(--color-gray-50);
    --color-background-light: #f5f5f5;
    --color-border: var(--color-light-grey);
    --color-error: #DC2626;
    /* Keeping error color for visibility */
    --color-success: #059669;
    /* Keeping success color for visibility */
    --color-success-light: #d1fae5;

    /* Primary Brand Colors */
    --color-primary-blue: #6366f1;
    --color-primary-blue-light: rgba(99, 102, 241, 0.1);
    --color-primary-blue-dark: #4f46e5;
    
    /* Extended Neutral Palette (for detailed UI work) */
    --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;
    
    /* Gray Scale Aliases (for backward compatibility with --color-gray-* usage) */
    --color-gray-50: var(--color-neutral-50);
    --color-gray-100: var(--color-neutral-100);
    --color-gray-200: var(--color-neutral-200);
    --color-gray-300: var(--color-neutral-300);
    --color-gray-400: var(--color-neutral-400);
    --color-gray-500: var(--color-neutral-500);
    --color-gray-600: var(--color-neutral-600);
    --color-gray-700: var(--color-neutral-700);
    --color-gray-800: var(--color-neutral-800);
    --color-gray-900: var(--color-neutral-900);
    
    /* Grey Scale (lightness-based naming: grey-97 = 97% lightness) */
    --color-grey-97: #f8f9fa;   /* 97% - lightest backgrounds */
    --color-grey-94: #f1f3f4;   /* 94% - subtle backgrounds */
    --color-grey-90: #e5e7eb;   /* 90% - borders, dividers */
    --color-grey-85: #d1d5db;   /* 85% - disabled elements */
    --color-grey-80: #c4c8cc;   /* 80% - medium borders */
    --color-grey-70: #9ca3af;   /* 70% - placeholder text */
    --color-grey-60: #6b7280;   /* 60% - secondary text */
    --color-grey-50: #4b5563;   /* 50% - body text */
    --color-grey-41: #374151;   /* 41% - headings */
    --color-grey-31: #1f2937;   /* 31% - dark text */
    
    /* Form-specific Colors */
    --color-input-background: var(--color-white);
    --color-input-border: var(--color-neutral-300);
    --color-input-focus: var(--color-primary-blue);
    --color-input-disabled: var(--color-neutral-100);
    --color-placeholder: var(--color-neutral-400);

    /* Typography */
    --font-family-heading: 'Franklin Gothic', Arial, sans-serif;
    --font-family-body: 'Franklin Gothic', Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;

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

    /* Spacing */
    --spacing-1: 0.25rem;     /* 4px */
    --spacing-1_5: 0.375rem;  /* 6px */
    --spacing-2: 0.5rem;      /* 8px */
    --spacing-2_5: 0.625rem;  /* 10px */
    --spacing-3: 0.75rem;     /* 12px */
    --spacing-4: 1rem;        /* 16px */
    --spacing-5: 1.25rem;     /* 20px */
    --spacing-6: 1.5rem;      /* 24px */
    --spacing-7: 1.75rem;     /* 28px */
    --spacing-8: 2rem;        /* 32px */
    --spacing-10: 2.5rem;     /* 40px */
    --spacing-12: 3rem;       /* 48px */
    --spacing-14: 3.5rem;     /* 56px */
    --spacing-16: 4rem;       /* 64px */
    --spacing-20: 5rem;       /* 80px */

    /* Layout */
    --header-height: 60px;
    --footer-height: 40px;
    --nav-width: 240px;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;
    --container-max-width: 1200px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-focus: 0 0 0 3px rgba(99, 102, 241, 0.1);
    --shadow-error-focus: 0 0 0 3px rgba(220, 38, 38, 0.1);

    /* Transitions */
    --transition-base: 0.2s ease;
    --transition-fast: 0.15s ease;
    --transition-slow: 300ms ease-in-out;
    --transition-all: all 0.2s ease;

}

/* Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-black);
    background-color: var(--color-gray-50);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
    font-weight: bold;
    line-height: 1.2;
}

/* Utility Classes */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Responsive Breakpoints */
@media (max-width: 640px) {
    :root {
        --container-max-width: 100%;
    }
}

.main-container {
    padding-top: var(--header-height);
    min-height: 100vh;
}

.content {
    padding: var(--spacing-8);
}