:root {
    /* Color Palette - Light Theme con tonalidad azul más intensa */
    --color-white: #f3f7ff;      /* Blanco azulado más perceptible */
    --color-gray-50: #ebf2ff;       /* Azul suave más saturado */
    --color-gray-100: #dde8ff;      /* Azul claro más evidente */
    --color-gray-200: #c8dcf7;      /* Azul gris claro intensificado */
    --color-gray-300: #b3c9f0;      /* Azul gris medio más vibrante */
    --color-gray-400: #7a92d1;      /* Azul medio más saturado */
    --color-gray-500: #5d73b8;      /* Azul medio más intenso */
    --color-gray-600: #405589;      /* Azul oscuro más profundo */
    --color-gray-700: #324263;      /* Azul profundo más rico */
    --color-gray-800: #273248;      /* Azul muy oscuro más saturado */
    --color-gray-900: #16213e;      /* Azul casi negro más definido */
    
    /* Brand Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #eef2ff;
    --color-secondary: #8b5cf6;
    --color-secondary-dark: #7c3aed;
    --color-secondary-light: #f3e8ff;
    --color-blue: #3b82f6;
    --color-blue-dark: #1d4ed8;
    --color-blue-light: #dbeafe;
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-warning-dark: #d97706;
    --color-error: #ef4444;
    --color-danger: #dc2626;
    --color-firmware-primary: #4a69bd;
    --color-info: #3b82f6;
    --color-info-light: #eff6ff;
    --color-success: #22c55e;

    /* Firmware Colors - Fixed (no theme change) */
    --firmware-brand-bg: #16213e;        /* Color actual del dark mode para brands */
    --firmware-model-bg: #0f3460;        /* Color solicitado para models/links */
    --firmware-text: #ffffff;            /* Texto blanco siempre */
    --firmware-brand-border: #324263;
    
    /* Semantic Color Tokens - Light Theme */
    --bg-primary: var(--color-white);
    --bg-secondary: var(--color-gray-50);
    --bg-tertiary: var(--color-gray-100);
    --bg-elevated: var(--color-white);
    --bg-overlay: rgba(0, 0, 0, 0.5);
    --bg-subtle: var(--color-gray-50);
    --bg-solid: var(--bg-primary);
    --bg-solid-elevated: var(--bg-elevated);
    --bg-dropdown-dark: #111827;
    
    /* Overlay Variants */
    --overlay-light-5: rgba(0, 0, 0, 0.05);
    --overlay-light-10: rgba(0, 0, 0, 0.1);
    --overlay-light-15: rgba(0, 0, 0, 0.15);
    --overlay-light-20: rgba(0, 0, 0, 0.20);
    --overlay-light-25: rgba(0, 0, 0, 0.25);
    --warning-overlay-10: rgba(245, 158, 11, 0.1);
    --danger-overlay-5: rgba(220, 38, 38, 0.05);
    --danger-overlay-8: rgba(220, 38, 38, 0.08);
    
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-tertiary: var(--color-gray-500);
    --text-inverse: var(--color-white);
    --text-accent: var(--color-primary);
    
    --border-primary: var(--color-gray-200);
    --border-secondary: var(--color-gray-300);
    --border-focus: var(--color-primary);
    --border-subtle: var(--color-gray-300);
    --border-width: 1px;
    --border-width-thick: 2px;
    
    /* Typography Scale */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-family-base: var(--font-family-primary);
    --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: 1.875rem;
    --font-size-5xl: 3rem;
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Line Heights */
    --line-height-relaxed: 1.75;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Size Scale */
    --size-8: 2rem;
    --size-9: 2.25rem;
    --size-10: 2.5rem;
    --size-11: 2.75rem;
    --size-12: 3rem;
    
    /* Design Tokens */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    --radius-thick: 1rem;
    
    /* Shadow System */
    --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);
    
    /* Interactive Shadows */
    --shadow-button: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-button-hover: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-elevated: 0 6px 12px rgba(0, 0, 0, 0.1);
    --shadow-elevated-hover: 0 8px 16px rgba(0, 0, 0, 0.15);
    
    /* Layout */
    --container-max-width: 1400px;
    --content-max-width: 1000px;
    --text-max-width: 65ch;
    --header-height: 4rem;
    
    /* Z-index Scale */
    --z-header: 100;
    --z-modal: 300;
    
    /* Transitions & Patterns */
    --transition-instant: 0.05s;
    --transition-fast: 0.15s;
    --transition-normal: 0.25s;
    --transition-slow: 0.35s;
    --transition-theme: 0.25s;
    --easing-standard: ease-out;
    --easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.1);
    
    /* Theme Transition Variables - Optimized */
    --theme-transition-timing: cubic-bezier(0.2, 0, 0, 1);
    --theme-transition-duration: 200ms;
    --theme-transition-mobile-duration: 150ms;
    --theme-transition-properties: background-color, color, border-color, box-shadow, fill, stroke;
    --theme-transition: var(--theme-transition-properties) var(--theme-transition-duration) var(--theme-transition-timing);
    --theme-transition-smooth: var(--theme-transition-properties) var(--theme-transition-mobile-duration) var(--theme-transition-timing);
    --theme-transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;

    /* Touch Targets - Accesibilidad */
    --touch-target-min: 44px;
    --touch-target-mobile: 40px;
    --touch-target-small: 36px;
    
    /* Outline & Focus - Accesibilidad */
    --outline-width: 2px;
    --outline-offset: 3px;
    --outline-width-high-contrast: 3px;
    --border-focus-high-contrast: currentColor;
    --border-high-contrast: currentColor;
    
    /* Opacity Scale - Estados */
    --opacity-disabled: 0.3;
    --opacity-reduced: 0.6;
    --opacity-subtle: 0.8;
    --opacity-hover: 0.9;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    --gradient-primary-dark: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary-dark));
    --gradient-blue-ocean: linear-gradient(135deg, #0ea5e9, #6366f1);

    /* Legal Pages */
    --legal-doc-max-width: 800px;
    --legal-doc-padding: var(--space-8);
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-primary: var(--color-gray-900);
    --bg-secondary: var(--color-gray-800);
    --bg-tertiary: var(--color-gray-700);
    --bg-elevated: var(--color-gray-800);
    --bg-overlay: rgba(0, 0, 0, 0.75);
    --bg-subtle: var(--color-gray-800);
    --bg-solid: var(--color-gray-900);
    --bg-solid-elevated: var(--color-gray-800);
    
    --text-primary: var(--color-gray-100);
    --text-secondary: var(--color-gray-300);
    --text-tertiary: var(--color-gray-400);
    
    --border-primary: var(--color-gray-700);
    --border-secondary: var(--color-gray-600);
    --border-subtle: var(--color-gray-600);
    
    --color-primary-light: rgba(99, 102, 241, 0.1);
    --color-secondary-light: rgba(139, 92, 246, 0.1);
    --color-blue-light: rgba(59, 130, 246, 0.1);
    --color-warning-light: rgba(245, 158, 11, 0.1);
    
    /* Adjusted shadows for dark theme */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --shadow-button: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-button-hover: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 6px 12px rgba(0, 0, 0, 0.3);
    --shadow-elevated-hover: 0 8px 16px rgba(0, 0, 0, 0.4);
}

/* Optimización para móviles */
.theme-mobile-optimized {
    --theme-transition-duration: var(--theme-transition-mobile-duration);
}

/* Clase para movimiento reducido */
.theme-reduced-motion * {
    transition-duration: 0.01s !important;
}

/* Media queries para optimización automática */
@media (max-width: 768px) {
    :root {
        --theme-transition-duration: var(--theme-transition-mobile-duration);
    }
}

@media (max-width: 480px) {
    :root {
        --theme-transition-duration: 120ms;
    }
}

/* Optimización para dispositivos de alta densidad */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .theme-mobile-optimized {
        --theme-transition-duration: 120ms;
    }
}