/**
 * CalcMenu Design Tokens
 * CSS Custom Properties for consistent theming
 *
 * Usage: var(--color-primary)
 * Benefits: Easy theming, dark mode support, single source of truth
 */

:root {
    /* ========================================
       COLORS - Minimal Clean Palette
       White bg, dark text, Charcoal primary
       ======================================== */
    --color-primary: #2d3436;           /* Charcoal - minimal clean */
    --color-primary-rgb: 45, 52, 54;
    --color-primary-dark: #1e2426;
    --color-primary-light: #636e72;

    --color-secondary: #6c757d;         /* Bootstrap Secondary Grey */
    --color-secondary-rgb: 108, 117, 125;
    --color-secondary-dark: #565e64;
    --color-secondary-light: #a0a5ab;

    --color-tertiary: #6c757d;          /* Same as secondary */
    --color-tertiary-rgb: 108, 117, 125;

    /* ========================================
       COLORS - Semantic (Bootstrap 5 Standard)
       ======================================== */
    --color-success: #198754;           /* Bootstrap Success Green */
    --color-success-rgb: 25, 135, 84;
    --color-success-light: #d1e7dd;

    --color-danger: #dc3545;            /* Bootstrap Danger Red */
    --color-danger-rgb: 220, 53, 69;
    --color-danger-light: #f8d7da;

    --color-warning: #ffc107;           /* Bootstrap Warning Yellow */
    --color-warning-rgb: 255, 193, 7;
    --color-warning-light: #fff3cd;

    --color-info: #0dcaf0;              /* Bootstrap Info Cyan */
    --color-info-rgb: 13, 202, 240;
    --color-info-light: #cff4fc;

    /* ========================================
       COLORS - Neutral Scale (Bootstrap 5)
       CLAUDE.md: Text #212529, Borders #dee2e6
       ======================================== */
    --color-white: #ffffff;
    --color-cream: #ffffff;             /* Use white, not cream */
    --color-gray-50: #f8f9fa;           /* Bootstrap light */
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;          /* CLAUDE.md border color */
    --color-gray-400: #ced4da;
    --color-gray-500: #6c757d;          /* Bootstrap secondary */
    --color-gray-600: #495057;
    --color-gray-700: #343a40;
    --color-gray-800: #212529;          /* CLAUDE.md text color */
    --color-gray-900: #212529;
    --color-black: #000000;

    /* ========================================
       COLORS - Background
       CLAUDE.md REQUIRED: White #ffffff background
       ======================================== */
    --color-body-bg: #ffffff;           /* WHITE - REQUIRED by CLAUDE.md */
    --color-card-bg: #ffffff;
    --color-card-bg-solid: #ffffff;
    --color-modal-backdrop: rgba(0, 0, 0, 0.5);

    /* ========================================
       SPACING - Based on 0.25rem (4px) scale
       ======================================== */
    --spacing-0: 0;
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */

    /* Semantic spacing aliases */
    --spacing-xs: var(--spacing-1);
    --spacing-sm: var(--spacing-2);
    --spacing-md: var(--spacing-4);
    --spacing-lg: var(--spacing-6);
    --spacing-xl: var(--spacing-8);
    --spacing-xxl: var(--spacing-12);

    /* ========================================
       TYPOGRAPHY
       ======================================== */
    --font-family-base: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* ========================================
       BORDERS
       ======================================== */
    --border-width: 1px;
    --border-color: var(--color-gray-300);
    --border-color-light: var(--color-gray-200);

    --border-radius-sm: 0.25rem;   /* 4px */
    --border-radius-md: 0.5rem;    /* 8px */
    --border-radius-lg: 0.75rem;   /* 12px */
    --border-radius-xl: 1rem;      /* 16px */
    --border-radius-2xl: 1.5rem;   /* 24px */
    --border-radius-full: 9999px;

    /* ========================================
       SHADOWS
       ======================================== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);

    /* Card-specific shadow (matches existing CalcMenu style) */
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-card-hover: 0 15px 40px rgba(0, 0, 0, 0.2);

    /* ========================================
       TRANSITIONS
       ======================================== */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-slower: 500ms ease;

    /* Specific transitions */
    --transition-colors: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
    --transition-transform: transform var(--transition-fast);
    --transition-shadow: box-shadow var(--transition-base);
    --transition-all: all var(--transition-base);

    /* ========================================
       Z-INDEX SCALE
       ======================================== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;

    /* ========================================
       COMPONENT-SPECIFIC TOKENS
       ======================================== */

    /* Cards */
    --card-border-radius: var(--border-radius-xl);
    --card-padding: var(--spacing-6);
    --card-shadow: var(--shadow-card);
    --card-bg: var(--color-card-bg);

    /* Buttons */
    --btn-border-radius: var(--border-radius-md);
    --btn-padding-x: var(--spacing-4);
    --btn-padding-y: var(--spacing-2);
    --btn-font-weight: var(--font-weight-medium);

    /* Forms */
    --input-border-radius: var(--border-radius-md);
    --input-border-color: var(--color-gray-300);
    --input-focus-border-color: var(--color-primary);
    --input-focus-shadow: 0 0 0 0.2rem rgba(var(--color-primary-rgb), 0.25);

    /* Tables */
    --table-header-bg: var(--color-gray-100);
    --table-hover-bg: var(--color-gray-50);
    --table-border-color: var(--color-gray-200);

    /* Navbar */
    --navbar-height: 56px;
    --navbar-bg: rgba(255, 255, 255, 0.95);

    /* Footer */
    --footer-height: 40px;
    --footer-bg: rgba(0, 0, 0, 0.1);
}

/* ========================================
   DARK MODE (Future - prepared but not active)
   ======================================== */
@media (prefers-color-scheme: dark) {
    :root.dark-mode {
        --color-body-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
        --color-card-bg: rgba(30, 30, 46, 0.95);
        --color-card-bg-solid: #1e1e2e;

        --color-gray-100: #2d2d3d;
        --color-gray-200: #3d3d4d;
        --color-gray-300: #4d4d5d;
        --color-gray-700: var(--color-gray-300);
        --color-gray-800: #f0f0f0;

        --border-color: var(--color-gray-300);
        --table-header-bg: var(--color-gray-200);
        --table-hover-bg: var(--color-gray-100);
    }
}