/**
 * CSS Variables - Design Tokens
 * Training Management System - UTE Da Nang University
 */

:root {
    /* ===== COLORS ===== */
    --color-primary: #3782F5;
    --color-secondary: #002878;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-info: #17a2b8;
    --color-light: #f8f9fa;
    --color-dark: #343a40;
    --color-gray: #e9ecef;
    --color-white: #ffffff;
    --color-black: #000000;
    /* ===== TYPOGRAPHY ===== */
    --font-family-base: "Roboto", Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    --line-height-base: 1.5;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    /* ===== SPACING ===== */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    /* ===== BORDER ===== */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --border-radius-full: 9999px;
    --border-width-thin: 1px;
    --border-width-medium: 2px;
    --border-width-thick: 4px;
    /* ===== 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, 0.15);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.2);
    /* ===== TRANSITIONS ===== */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-slower: 0.8s ease;
    /* ===== Z-INDEX ===== */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
    /* ===== BREAKPOINTS (for reference in JS) ===== */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-xxl: 1400px;
    /* ===== GRADIENTS ===== */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    --gradient-light: linear-gradient(135deg, #ffffff, #f8f9fa);
    --gradient-overlay: linear-gradient(to bottom, rgba(0,0,0,0.6), rgba(0,0,0,0.3));
}