/**
 * Theme System - CSS Variables
 * Gahan Library - Phase 3
 *
 * Design system complet avec support dark mode
 */

:root {
    /* ========================================
       COLORS - Light Mode (Default)
       ======================================== */

    /* Primary - Inspiré de 21st.digital (#2299dd) */
    --color-primary: #2299dd;
    --color-primary-light: #4daee6;
    --color-primary-dark: #1a7ab8;
    --color-primary-alpha: rgba(34, 153, 221, 0.1);
    --color-primary-alpha-20: rgba(34, 153, 221, 0.2);

    /* Secondary - Complémentaire */
    --color-secondary: #764ba2;
    --color-secondary-light: #9066bd;
    --color-secondary-dark: #5a3a7d;
    --color-secondary-alpha: rgba(118, 75, 162, 0.1);

    /* Neutrals - Minimaliste */
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
    --color-background-elevated: #ffffff;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f7fa;

    /* Text */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #ffffff;

    /* Borders */
    --color-border: #e5e7eb;
    --color-border-hover: #d1d5db;
    --color-divider: #f3f4f6;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #34d399;
    --color-success-dark: #059669;
    --color-success-bg: #d1fae5;

    --color-warning: #f59e0b;
    --color-warning-light: #fbbf24;
    --color-warning-dark: #d97706;
    --color-warning-bg: #fef3c7;

    --color-error: #ef4444;
    --color-error-light: #f87171;
    --color-error-dark: #dc2626;
    --color-error-bg: #fee2e2;

    --color-info: #3b82f6;
    --color-info-light: #60a5fa;
    --color-info-dark: #2563eb;
    --color-info-bg: #dbeafe;

    /* ========================================
       TYPOGRAPHY
       ======================================== */

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

    /* Font Sizes - Scale harmonieuse (1.125 ratio) */
    --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 */

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

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* ========================================
       SPACING & LAYOUT
       ======================================== */

    /* Spacing Scale - Base 4px */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 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;

    /* Shadows - Subtils et modernes */
    --shadow-none: none;
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1),
                 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
                 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
                 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
                 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Layout Dimensions */
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 64px;
    --header-height: 64px;
    --content-max-width: 1440px;
    --content-padding: var(--space-6);

    /* Z-Index Scale */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;

    /* ========================================
       ANIMATIONS & TRANSITIONS
       ======================================== */

    /* Durations */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 350ms;
    --duration-slower: 500ms;

    /* Easing 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-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Transition Presets */
    --transition-colors: color var(--duration-normal) var(--ease-in-out),
                         background-color var(--duration-normal) var(--ease-in-out),
                         border-color var(--duration-normal) var(--ease-in-out);
    --transition-transform: transform var(--duration-normal) var(--ease-out);
    --transition-opacity: opacity var(--duration-normal) var(--ease-in-out);
    --transition-all: all var(--duration-normal) var(--ease-in-out);
    --transition-shadow: box-shadow var(--duration-normal) var(--ease-in-out);

    /* ========================================
       BREAKPOINTS (pour référence JS)
       ======================================== */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    transition: background-color var(--duration-normal) var(--ease-in-out),
                color var(--duration-normal) var(--ease-in-out);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Text Colors */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-inverse { color: var(--color-text-inverse); }

/* Background Colors */
.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-surface { background-color: var(--color-surface); }
.bg-elevated { background-color: var(--color-background-elevated); }

/* Spacing Utilities */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

/* Border Radius */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-none { box-shadow: var(--shadow-none); }
.shadow-xs { box-shadow: var(--shadow-xs); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Transitions */
.transition-colors { transition: var(--transition-colors); }
.transition-transform { transition: var(--transition-transform); }
.transition-opacity { transition: var(--transition-opacity); }
.transition-all { transition: var(--transition-all); }
.transition-shadow { transition: var(--transition-shadow); }

/* ========================================
   FOCUS STYLES (Accessibility)
   ======================================== */

:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   SCROLLBAR STYLING
   ======================================== */

::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-background-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-hover);
    border-radius: var(--radius-lg);
    border: 3px solid var(--color-background-alt);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-hover) var(--color-background-alt);
}

/* ========================================
   SELECTION
   ======================================== */

::selection {
    background-color: var(--color-primary-alpha-20);
    color: var(--color-text-primary);
}

::-moz-selection {
    background-color: var(--color-primary-alpha-20);
    color: var(--color-text-primary);
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    body {
        background: white;
        color: black;
    }

    .no-print {
        display: none !important;
    }
}