/*
 * H2MIRI CSS Variables & Design Tokens
 * Centralized styling configuration for consistency across the site
 */

:root {
    /* ==============================
       COLOR PALETTE
       ============================== */

    /* Primary Colors */
    --primary: #003366;
    --primary-light: #0052a3;
    --primary-dark: #001f40;
    --primary-hover: #004d80;

    /* Secondary Colors */
    --secondary: #2d776c;
    --secondary-light: #4a9b91;
    --secondary-dark: #1f5450;

    /* Neutral Colors */
    --dark: #1a1a1a;
    --gray-900: #1f2937;
    --gray-800: #374151;
    --gray-700: #4b5563;
    --gray-600: #6b7280;
    --gray-500: #9ca3af;
    --gray-400: #d1d5db;
    --gray-300: #e5e7eb;
    --gray-200: #f3f4f6;
    --gray-100: #f9fafb;
    --gray-bg: #f5f5f5;
    --light: #ffffff;

    /* Status Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --info: #3b82f6;
    --info-light: #dbeafe;

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

    /* Font Families */
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Monaco', 'Courier New', monospace;

    /* Font Sizes - Mobile First */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-md: 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 Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;

    /* ==============================
       SPACING SCALE
       ============================== */

    --spacing-0: 0;
    --spacing-xs: 0.25rem;      /* 4px */
    --spacing-sm: 0.5rem;       /* 8px */
    --spacing-md: 1rem;         /* 16px */
    --spacing-lg: 1.5rem;       /* 24px */
    --spacing-xl: 2rem;         /* 32px */
    --spacing-2xl: 2.5rem;      /* 40px */
    --spacing-3xl: 3rem;        /* 48px */
    --spacing-4xl: 4rem;        /* 64px */

    /* ==============================
       SIZING SCALE
       ============================== */

    --size-xs: 20px;
    --size-sm: 32px;
    --size-md: 48px;
    --size-lg: 64px;
    --size-xl: 80px;
    --size-2xl: 96px;
    --size-3xl: 128px;

    /* Max Widths */
    --max-width-sm: 640px;
    --max-width-md: 768px;
    --max-width-lg: 1024px;
    --max-width-xl: 1280px;
    --max-width-2xl: 1400px;

    /* ==============================
       BORDER RADIUS
       ============================== */

    --card-radius: 9px;
    --radius-none: 0;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* ==============================
       SHADOWS
       ============================== */

    --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 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);

    /* ==============================
       TRANSITIONS
       ============================== */

    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
    --transition-slower: 500ms ease-in-out;

    /* Common transition combinations */
    --transition-color: color var(--transition-base);
    --transition-bg: background-color var(--transition-base);
    --transition-all: all var(--transition-base);
    --transition-transform: transform var(--transition-base);
    --transition-opacity: opacity var(--transition-base);

    /* ==============================
       BREAKPOINTS
       ============================== */

    /* Mobile-first approach */
    --breakpoint-sm: 640px;      /* Tablets */
    --breakpoint-md: 1024px;     /* Desktops */
    --breakpoint-lg: 1400px;     /* Large Desktops */

    /* ==============================
       Z-INDEX SCALE
       ============================== */

    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 900;
    --z-modal: 1000;
    --z-tooltip: 1100;
    --z-notification: 1200;

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

    /* Cards */
    --card-padding: var(--spacing-md);
    --card-border-color: #ccc;
    --card-background: var(--gray-100);
    --card-shadow: var(--shadow-md);

    /* Buttons */
    --button-padding-x: var(--spacing-md);
    --button-padding-y: var(--spacing-sm);
    --button-radius: var(--radius-md);
    --button-font-weight: var(--font-weight-semibold);
    --button-transition: var(--transition-all);

    /* Forms */
    --form-input-padding: var(--spacing-sm) var(--spacing-md);
    --form-input-border-radius: var(--radius-md);
    --form-input-border-color: var(--gray-300);
    --form-input-background: var(--light);
    --form-input-focus-border-color: var(--primary);
    --form-input-focus-shadow: 0 0 0 3px rgba(0, 51, 102, 0.1);

    /* Modal */
    --modal-backdrop-bg: rgba(0, 0, 0, 0.5);
    --modal-border-radius: 10px;
    --modal-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    --modal-z-index: var(--z-modal);

    /* ==============================
       OPACITY SCALE
       ============================== */

    --opacity-0: 0;
    --opacity-5: 0.05;
    --opacity-10: 0.1;
    --opacity-25: 0.25;
    --opacity-50: 0.5;
    --opacity-75: 0.75;
    --opacity-90: 0.9;
    --opacity-95: 0.95;
    --opacity-100: 1;
}

/* ==============================
   DARK MODE (Optional Future Addition)
   ============================== */

@media (prefers-color-scheme: dark) {
    :root {
        --gray-100: #1f2937;
        --gray-200: #374151;
        --gray-bg: #111827;
        --light: #1f2937;
        --dark: #f9fafb;
        --card-background: #374151;
        --form-input-background: #374151;
        --form-input-border-color: #4b5563;
    }
}

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

@media print {
    :root {
        --shadow-xs: none;
        --shadow-sm: none;
        --shadow-md: none;
        --shadow-lg: none;
        --transition-fast: none;
        --transition-base: none;
        --transition-slow: none;
    }
}