/**
 * CSS Variables - Design Token System
 * Nexus Application Theme
 *
 * This file defines the color palette and design tokens for both light and dark modes.
 * All colors and component values should reference these variables for consistency.
 */

:root {
    /* ========================================
       Color Palette - Light Mode
       ======================================== */

    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e9ecef;
    --color-bg-hover: rgba(13, 110, 253, 0.02);

    /* Text Colors */
    --color-text-primary: #212529;
    --color-text-secondary: #6c757d;
    --color-text-tertiary: #495057;
    --color-text-muted: #6c757d;

    /* Border Colors */
    --color-border-primary: #e9ecef;
    --color-border-secondary: #dee2e6;
    --color-border-tertiary: #ced4da;
    --color-border-focus: #0d6efd;
    --color-border-focus-shadow: rgba(13, 110, 253, 0.25);

    /* State Colors */
    --color-success: #198754;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-info: #0dcaf0;
    --color-primary: #0d6efd;

    /* Mystery Landing Theme */
    --color-mystery-purple: #667eea;
    --color-mystery-dark: #0a0e27;

    /* Status/Outcome Colors */
    --color-outcome-positive-bg: #d1edff;
    --color-outcome-positive-text: #0969da;
    --color-outcome-negative-bg: #ffebe9;
    --color-outcome-negative-text: #cf222e;

    /* Gradient Accents */
    --color-accent-purple: #6610f2;
    --color-accent-purple-light: #764ba2;

    /* ========================================
       Component Tokens
       ======================================== */

    /* Cards */
    --card-bg: var(--color-bg-primary);
    --card-border: var(--color-border-primary);
    --card-border-hover: var(--color-border-secondary);
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --card-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.08);
    --card-radius: 12px;
    --card-padding: 1.5rem;
    --card-padding-sm: 1rem;
    --card-padding-xs: 0.75rem;

    /* Header Icons */
    --header-icon-bg: var(--color-bg-secondary);
    --header-icon-color: var(--color-text-secondary);
    --header-icon-size: 48px;
    --header-icon-size-sm: 40px;
    --header-icon-radius: 12px;

    /* Forms */
    --form-bg: var(--color-bg-primary);
    --form-border: var(--color-border-tertiary);
    --form-border-focus: var(--color-border-focus);
    --form-text: var(--color-text-primary);
    --form-placeholder: #9ca3af;
    --form-radius: 8px;
    --form-padding: 0.75rem 1rem;

    /* Sections */
    --section-margin: 2.5rem;
    --section-margin-sm: 2rem;

    /* Spacing Scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;

    /* Typography Scale */
    --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: 2.5rem;       /* 40px */
    --font-size-display: 5rem;     /* 80px */

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-snug: 1.3;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.6;

    /* Icon Sizes */
    --icon-xs: 0.75rem;
    --icon-sm: 1rem;
    --icon-md: 1.25rem;
    --icon-lg: 1.5rem;
    --icon-xl: 2rem;
    --icon-2xl: 2.5rem;

    /* Button Sizes */
    --button-size-sm: 36px;
    --button-size-md: 44px;
    --button-size-lg: 52px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ========================================
   Dark Mode Theme - Uses Bootstrap 5.3+ Native Dark Mode
   ======================================== */

[data-bs-theme="dark"] {
    /* Background Colors - Aligned with Bootstrap dark mode */
    --color-bg-primary: var(--bs-body-bg, #212529);
    --color-bg-secondary: var(--bs-secondary-bg, #2b3035);
    --color-bg-tertiary: var(--bs-tertiary-bg, #2b3035);
    --color-bg-hover: rgba(255, 255, 255, 0.05);

    /* Text Colors - Aligned with Bootstrap dark mode */
    --color-text-primary: var(--bs-body-color, #dee2e6);
    --color-text-secondary: var(--bs-secondary-color, #adb5bd);
    --color-text-tertiary: var(--bs-emphasis-color, #dee2e6);
    --color-text-muted: var(--bs-secondary-color, #adb5bd);

    /* Border Colors - Aligned with Bootstrap dark mode */
    --color-border-primary: var(--bs-border-color, #495057);
    --color-border-secondary: var(--bs-border-color-translucent, rgba(255, 255, 255, 0.15));
    --color-border-tertiary: var(--bs-border-color, #495057);
    --color-border-focus: #86b7fe;
    --color-border-focus-shadow: rgba(134, 183, 254, 0.25);

    /* State Colors - Bootstrap default dark mode colors */
    --color-success: var(--bs-success, #198754);
    --color-danger: var(--bs-danger, #dc3545);
    --color-warning: var(--bs-warning, #ffc107);
    --color-info: var(--bs-info, #0dcaf0);

    /* Dark Mode Status/Outcome Colors */
    --color-outcome-positive-bg: rgba(9, 105, 218, 0.2);
    --color-outcome-positive-text: #86b7fe;
    --color-outcome-negative-bg: rgba(207, 34, 46, 0.2);
    --color-outcome-negative-text: #ff7b72;

    /* Component Overrides */
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    --card-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.6);

    /* Form Overrides */
    --form-bg: var(--color-bg-secondary);
    --form-placeholder: var(--color-text-secondary);

    /* Browser color-scheme hint */
    color-scheme: dark;
}

/* ========================================
   Light Mode - Browser Color Scheme Hint
   ======================================== */

[data-bs-theme="light"] {
    color-scheme: light;
}

/* ========================================
   Media Query Helpers
   ======================================== */

@media (max-width: 768px) {
    :root {
        --header-icon-size: var(--header-icon-size-sm);
        --card-padding: var(--card-padding-sm);
        --section-margin: var(--section-margin-sm);
    }
}

@media (max-width: 576px) {
    :root {
        --card-padding: var(--card-padding-xs);
    }
}