/* =========================================
   CSS CUSTOM PROPERTIES (Variables)
   ========================================= */

:root {
    /* ===== COLORS - LIGHT MODE (Default) ===== */
    --color-primary: #32B8C6;
    --color-primary-hover: #29A4B1;
    --color-primary-active: #21808D;

    --color-secondary: rgba(94, 82, 64, 0.12);
    --color-secondary-hover: rgba(94, 82, 64, 0.2);

    --color-background: #FCFCF9;
    --color-surface: #FFFFFF;
    --color-surface-elevated: #FFFFFF;

    --color-text-primary: #134252;
    --color-text-secondary: #626C71;
    --color-text-tertiary: #A7A9A9;

    --color-border: rgba(94, 82, 64, 0.2);
    --color-border-light: rgba(94, 82, 64, 0.1);

    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    --color-info: #3B82F6;

    /* ===== TYPOGRAPHY ===== */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'Fira Code', 'Courier New', monospace;

    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 550;
    --font-weight-bold: 600;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.75;

    /* ===== SPACING ===== */
    --space-0: 0;
    --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;

    /* ===== BORDER RADIUS ===== */
    --radius-sm: 6px;
    --radius-base: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* ===== 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, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --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, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* ===== TRANSITIONS ===== */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* ===== Z-INDEX ===== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* ===== LAYOUT ===== */
    --header-height: 60px;
    --sidebar-width: 280px;
    --panel-width: 320px;
    --toolbar-height: 48px;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
    --color-primary: #32B8C6;
    --color-primary-hover: #3DD1E0;
    --color-primary-active: #29CDD8;

    --color-secondary: rgba(119, 124, 124, 0.15);
    --color-secondary-hover: rgba(119, 124, 124, 0.25);

    --color-background: #1F2121;
    --color-surface: #262828;
    --color-surface-elevated: #2D2F2F;

    --color-text-primary: #F5F5F5;
    --color-text-secondary: rgba(167, 169, 169, 0.7);
    --color-text-tertiary: #777C7C;

    --color-border: rgba(119, 124, 124, 0.3);
    --color-border-light: rgba(119, 124, 124, 0.15);

    --color-success: #10B981;
    --color-error: #F87171;
    --color-warning: #FBBF24;
    --color-info: #60A5FA;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
}

/* ===== AUTO THEME (System Preference) ===== */
@media (prefers-color-scheme: dark) {
    [data-theme="auto"] {
        --color-primary: #32B8C6;
        --color-primary-hover: #3DD1E0;
        --color-primary-active: #29CDD8;

        --color-secondary: rgba(119, 124, 124, 0.15);
        --color-secondary-hover: rgba(119, 124, 124, 0.25);

        --color-background: #1F2121;
        --color-surface: #262828;
        --color-surface-elevated: #2D2F2F;

        --color-text-primary: #F5F5F5;
        --color-text-secondary: rgba(167, 169, 169, 0.7);
        --color-text-tertiary: #777C7C;

        --color-border: rgba(119, 124, 124, 0.3);
        --color-border-light: rgba(119, 124, 124, 0.15);

        --color-success: #10B981;
        --color-error: #F87171;
        --color-warning: #FBBF24;
        --color-info: #60A5FA;

        --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    }
}