/* =============================================
   ElevateMath Design System Tokens
   ============================================= */

:root {
    /* --- Colors --- */
    /* Primary */
    --color-primary: #1e293b;
    --color-primary-light: #334155;
    --color-primary-lighter: #475569;

    /* Accent */
    --color-accent: #d97706;
    --color-accent-hover: #b45309;
    --color-accent-light: #fbbf24;
    --color-accent-bg: #fffbeb;

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Semantic */
    --color-success: #16a34a;
    --color-success-bg: #f0fdf4;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --color-info: #2563eb;
    --color-info-bg: #eff6ff;
    --color-warning: #d97706;
    --color-warning-bg: #fffbeb;

    /* Background */
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;
    --color-bg-input: #ffffff;

    /* Text */
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-text-inverse: #ffffff;

    /* --- Typography --- */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;

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

    /* --- Spacing (4px increments) --- */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* --- Borders --- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    --border-color: #e2e8f0;
    --border-color-focus: #d97706;

    /* --- Shadows --- */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

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

    /* --- Layout --- */
    --max-width-card: 520px;
    --max-width-content: 1200px;
    --header-height: 64px;
}