/**
 * CSS Variables - EduProd Design System
 */

:root {
    /* Brand Colors */
    --brand-navy: #1a2e5a;
    --brand-orange: #F47B20;

    /* Subject Colors */
    --physics-primary: #5ce1e6;
    --physics-bg: #0f1729;
    --physics-dark: #0a0e1a;

    --chemistry-primary: #4db8b8;
    --chemistry-light: #5ce1e6;
    --chemistry-bg: #f5f5f0;
    --chemistry-dark: #1a6d6d;

    --math-primary: #f59e0b;
    --math-light: #fcd34d;
    --math-bg: #1a1410;

    --biology-primary: #10b981;
    --biology-light: #34d399;
    --biology-bg: #0a1910;

    /* Neutral Colors */
    --bg-dark: #0a0e1a;
    --bg-darker: #060811;
    --bg-card: rgba(20, 28, 46, 0.6);
    --bg-card-hover: rgba(20, 28, 46, 0.8);

    --text-primary: #eef2f9;
    --text-secondary: #b6c8e8;
    --text-tertiary: #8b9cb8;
    --text-muted: #6a7fa0;

    --border-subtle: rgba(92, 225, 230, 0.1);
    --border-medium: rgba(92, 225, 230, 0.2);
    --border-strong: rgba(92, 225, 230, 0.4);

    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3rem;
    --text-6xl: 4rem;

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);

    --shadow-glow-physics: 0 0 30px rgba(92, 225, 230, 0.3);
    --shadow-glow-chemistry: 0 0 30px rgba(77, 184, 184, 0.3);
    --shadow-glow-math: 0 0 30px rgba(245, 158, 11, 0.3);
    --shadow-glow-biology: 0 0 30px rgba(16, 185, 129, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-spring: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-index Scale */
    --z-base: 0;
    --z-dropdown: 10;
    --z-sticky: 50;
    --z-fixed: 100;
    --z-modal: 1000;
    --z-tooltip: 1100;

    /* Container Max Width */
    --container-xl: 1280px;
}