/**
 * LUVA TRAVEL - DESIGN SYSTEM VARIABLES
 * =============================================
 *
 * LƯU Ý: File này KHÔNG chứa màu sắc
 * Tất cả màu sắc được quản lý trong colors-centralized.css
 *
 * File này chứa:
 * - Typography system
 * - Spacing system
 * - Layout variables
 * - Effects & animations
 * - Responsive breakpoints
 *
 * @package Luva Travel Child Theme
 * @since 2.3.0
 * @author Luva Travel Development Team
 */

:root {
    /* ========================================
       TYPOGRAPHY SYSTEM - HỆ THỐNG FONT CHỮ
       ======================================== */

    /* Font Families */
    --font-primary: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-secondary: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Font Sizes - Responsive Scale */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg: 1.125rem;    /* 18px */
    --text-xl: 1.25rem;     /* 20px */
    --text-2xl: 1.5rem;     /* 24px */
    --text-3xl: 1.875rem;   /* 30px */
    --text-4xl: 2.25rem;    /* 36px */
    --text-5xl: 3rem;       /* 48px */
    --text-6xl: 3.75rem;    /* 60px */

    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* ========================================
       SPACING SYSTEM - HỆ THỐNG KHOẢNG CÁCH
       ======================================== */

    /* Spacing Scale - 8pt Grid System */
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;  /* 2px */
    --space-1: 0.25rem;     /* 4px */
    --space-1-5: 0.375rem;  /* 6px */
    --space-2: 0.5rem;      /* 8px */
    --space-2-5: 0.625rem;  /* 10px */
    --space-3: 0.75rem;     /* 12px */
    --space-3-5: 0.875rem;  /* 14px */
    --space-4: 1rem;        /* 16px */
    --space-5: 1.25rem;     /* 20px */
    --space-6: 1.5rem;      /* 24px */
    --space-7: 1.75rem;     /* 28px */
    --space-8: 2rem;        /* 32px */
    --space-9: 2.25rem;     /* 36px */
    --space-10: 2.5rem;     /* 40px */
    --space-11: 2.75rem;    /* 44px */
    --space-12: 3rem;       /* 48px */
    --space-14: 3.5rem;     /* 56px */
    --space-16: 4rem;       /* 64px */
    --space-20: 5rem;       /* 80px */
    --space-24: 6rem;       /* 96px */
    --space-28: 7rem;       /* 112px */
    --space-32: 8rem;       /* 128px */

    /* Legacy Spacing Support */
    --space-xs: var(--space-1);
    --space-sm: var(--space-2);
    --space-md: var(--space-4);
    --space-lg: var(--space-6);
    --space-xl: var(--space-8);
    --space-2xl: var(--space-12);
    --space-3xl: var(--space-16);

    /* ========================================
       LAYOUT SYSTEM - HỆ THỐNG LAYOUT
       ======================================== */

    /* Container Sizes */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
    --container-max-width: 1200px;
    --container-padding: 1.25rem;      /* 20px */
    --container-padding-mobile: 1rem;  /* 16px */

    /* Border Radius Scale */
    --radius-none: 0;
    --radius-sm: 0.125rem;      /* 2px */
    --radius: 0.25rem;          /* 4px */
    --radius-md: 0.375rem;      /* 6px */
    --radius-lg: 0.5rem;        /* 8px */
    --radius-xl: 0.75rem;       /* 12px */
    --radius-2xl: 1rem;         /* 16px */
    --radius-3xl: 1.5rem;       /* 24px */
    --radius-full: 9999px;      /* Fully rounded */

    /* Legacy Border Radius Support */
    --border-radius-sm: var(--radius-sm);
    --border-radius: var(--radius-md);
    --border-radius-md: var(--radius-lg);
    --border-radius-lg: var(--radius-xl);
    --border-radius-xl: var(--radius-2xl);

    /* ========================================
       EFFECTS SYSTEM - HỆ THỐNG HIỆU ỨNG
       ======================================== */

    /* Box Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    --shadow-none: 0 0 #0000;

    /* Transitions */
    --transition-none: none;
    --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-colors: color 150ms cubic-bezier(0.4, 0, 0.2, 1), background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), border-color 150ms cubic-bezier(0.4, 0, 0.2, 1);

    /* ========================================
       RESPONSIVE SYSTEM - HỆ THỐNG RESPONSIVE
       ======================================== */

    /* Breakpoints */
    --breakpoint-xs: 475px;
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;

    /* Z-Index Scale */
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-auto: auto;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 1000;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
    --z-overlay: 3000;

    /* Component Heights */
    --header-height: 65px;
    --header-height-mobile: 65px;
    --footer-height: auto;
    --navbar-height: 65px;
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 80px;

    /* ========================================
       ANIMATION SYSTEM - HỆ THỐNG ANIMATION
       ======================================== */

    /* Animation Durations */
    --duration-75: 75ms;
    --duration-100: 100ms;
    --duration-150: 150ms;
    --duration-200: 200ms;
    --duration-300: 300ms;
    --duration-500: 500ms;
    --duration-700: 700ms;
    --duration-1000: 1000ms;

    /* Animation Timing Functions */
    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ========================================
       UTILITY VARIABLES - BIẾN TIỆN ÍCH
       ======================================== */

    /* Opacity Scale */
    --opacity-0: 0;
    --opacity-5: 0.05;
    --opacity-10: 0.1;
    --opacity-20: 0.2;
    --opacity-25: 0.25;
    --opacity-30: 0.3;
    --opacity-40: 0.4;
    --opacity-50: 0.5;
    --opacity-60: 0.6;
    --opacity-70: 0.7;
    --opacity-75: 0.75;
    --opacity-80: 0.8;
    --opacity-90: 0.9;
    --opacity-95: 0.95;
    --opacity-100: 1;

    /* Blur Scale */
    --blur-none: 0;
    --blur-sm: 4px;
    --blur: 8px;
    --blur-md: 12px;
    --blur-lg: 16px;
    --blur-xl: 24px;
    --blur-2xl: 40px;
    --blur-3xl: 64px;
}

/* ========================================
   RESPONSIVE ADJUSTMENTS
   ======================================== */

@media (max-width: 768px) {
    :root {
        /* Mobile-specific adjustments */
        --container-padding: var(--container-padding-mobile);
        --text-3xl: 1.5rem;   /* Smaller on mobile */
        --text-4xl: 2rem;     /* Smaller on mobile */
        --text-5xl: 2.5rem;   /* Smaller on mobile */
        --text-6xl: 3rem;     /* Smaller on mobile */
    }
}

@media (max-width: 480px) {
    :root {
        /* Extra small mobile adjustments */
        --space-2xl: var(--space-8);
        --space-3xl: var(--space-12);
    }
}