/* ================================
   THEME VARIABLES & COLOR SYSTEM
   ================================ */

:root {
    /* Color Palette - Dark Theme (Default) */
    --primary-color: #00d4ff;
    --secondary-color: #0099ff;
    --accent-color: #ff0080;
    
    --bg-primary: #0a0e27;
    --bg-secondary: #141a35;
    --bg-tertiary: #1e2749;
    --bg-hover: #252d4f;
    
    --text-primary: #ffffff;
    --text-secondary: #b4b9d6;
    --text-muted: #7c83a8;
    
    --border-color: #2a3355;
    --border-light: #3a4566;
    
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4444;
    --info-color: #00d4ff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0099ff 100%);
    --gradient-accent: linear-gradient(135deg, #ff0080 0%, #ff6b35 100%);
    --gradient-dark: linear-gradient(180deg, #0a0e27 0%, #141a35 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    
    --shadow-primary: 0 4px 20px rgba(0, 212, 255, 0.3);
    --shadow-accent: 0 4px 20px rgba(255, 0, 128, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    --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;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s 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 */
    --container-max-width: 1200px;
    --navbar-height: 80px;
    
    /* Effects */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;
}

/* ================================
   LIGHT THEME
   ================================ */

[data-theme="light"] {
    --primary-color: #0099ff;
    --secondary-color: #00d4ff;
    --accent-color: #ff0080;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fa;
    --bg-tertiary: #e8ecf1;
    --bg-hover: #dde2e9;
    
    --text-primary: #1a1f36;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    
    --border-color: #e2e8f0;
    --border-light: #cbd5e0;
    
    --success-color: #00cc66;
    --warning-color: #ff9900;
    --error-color: #ff3333;
    --info-color: #0099ff;
    
    --gradient-primary: linear-gradient(135deg, #0099ff 0%, #00d4ff 100%);
    --gradient-accent: linear-gradient(135deg, #ff0080 0%, #ff6b35 100%);
    --gradient-dark: linear-gradient(180deg, #f5f7fa 0%, #e8ecf1 100%);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.18);
    
    --shadow-primary: 0 4px 20px rgba(0, 153, 255, 0.2);
    --shadow-accent: 0 4px 20px rgba(255, 0, 128, 0.2);
}

/* ================================
   THEME TRANSITION
   ================================ */

body {
    transition: background-color var(--transition-base),
                color var(--transition-base);
}

* {
    transition: border-color var(--transition-base),
                background-color var(--transition-base),
                color var(--transition-base);
}

/* Disable transitions on theme change for performance */
body.theme-transitioning * {
    transition: none !important;
}

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

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
}

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

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-light) var(--bg-secondary);
}

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

::selection {
    background: var(--primary-color);
    color: var(--bg-primary);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--bg-primary);
}

/* ================================
   ACCESSIBILITY
   ================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Remove focus outline for mouse users */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: var(--text-primary);
        --border-light: var(--text-secondary);
    }
}

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

@media print {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #ffffff;
        --text-primary: #000000;
        --text-secondary: #333333;
    }
    
    * {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
}