/* ============================================================
   SCLS Design Tokens — Smart Classroom Lesson System
   Minimalist Futuristic Design System · 2030
   ============================================================ */

:root {
    /* === BRAND === */
    --brand-primary: #0D9488;
    --brand-primary-light: #14B8A6;
    --brand-primary-dark: #0F766E;
    --brand-secondary: #6366F1;
    --brand-secondary-light: #818CF8;
    --brand-accent: #F59E0B;

    /* === SURFACES === */
    --surface-0: #FFFFFF;
    --surface-1: #F8FAFC;
    --surface-2: #F1F5F9;
    --surface-3: #E2E8F0;
    --surface-card: #FFFFFF;
    --surface-elevated: #FFFFFF;
    --surface-overlay: rgba(15, 23, 42, 0.6);

    /* === TEXT === */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-inverse: #FFFFFF;
    --text-link: var(--brand-primary);

    /* === BORDERS === */
    --border-default: #E2E8F0;
    --border-subtle: #F1F5F9;
    --border-strong: #CBD5E1;
    --border-focus: var(--brand-primary);

    /* === STATUS === */
    --status-success: #10B981;
    --status-success-bg: #ECFDF5;
    --status-warning: #F59E0B;
    --status-warning-bg: #FFFBEB;
    --status-danger: #EF4444;
    --status-danger-bg: #FEF2F2;
    --status-info: #3B82F6;
    --status-info-bg: #EFF6FF;

    /* === SHADOWS === */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    /* === RADIUS === */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* === SPACING (4px base) === */
    --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;

    /* === TYPOGRAPHY (Minor third 1.200 ratio) === */
    --font-family: 'Alexandria', -apple-system, system-ui, sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --text-xs: 0.694rem;
    --text-sm: 0.833rem;
    --text-base: 0.9375rem;
    --text-md: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    --leading-tight: 1.3;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;

    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* === TRANSITIONS === */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-spring: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* === Z-INDEX === */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    /* فوق لوحات تحرير / درج التعديل (edit_v2 ≈1000+) ومودالات lv2 (~9500) */
    --z-toast: 10800;

    /* === BLOCK COLORS === */
    --block-engagement: #F59E0B;
    --block-concept: #3B82F6;
    --block-activity: #10B981;
    --block-discussion: #8B5CF6;
    --block-differentiation: #EC4899;
    --block-assessment: #EF4444;
    --block-feedback: #06B6D4;
    --block-media: #6366F1;
    --block-real-life: #F97316;
    --block-reflection: #14B8A6;
}