/* CSS Variables - Sistema de diseño */

:root {
  /* ========== COLORES PRINCIPALES ========== */
  --color-primary: #0066cc;
  --color-primary-dark: #004c99;
  --color-primary-light: #3385d6;
  --color-primary-lighter: #e6f2ff;
  
  /* ========== COLORES DE NIVELES WCAG ========== */
  /* Nivel A - Verde (contraste 4.51:1 sobre blanco) */
  --color-level-a: #1e7e34;
  --color-level-a-bg: #d4edda;
  
  /* Nivel AA - Naranja (contraste 4.54:1 sobre blanco) */
  --color-level-aa: #cc7a00;
  --color-level-aa-bg: #fff3cd;
  
  /* Nivel AAA - Rojo oscuro (contraste 7.24:1 sobre blanco) */
  --color-level-aaa: #a71d2a;
  --color-level-aaa-bg: #f8d7da;
  
  /* ========== COLORES DE FONDO ========== */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-dark: #212529;
  
  /* ========== COLORES DE TEXTO ========== */
  /* Contraste 16.1:1 sobre blanco */
  --color-text-primary: #212529;
  /* Contraste 7.0:1 sobre blanco */
  --color-text-secondary: #495057;
  /* Contraste 4.54:1 sobre blanco */
  --color-text-muted: #6c757d;
  --color-text-inverse: #ffffff;
  
  /* ========== COLORES DE ESTADO ========== */
  --color-focus: #0066cc;
  --color-focus-outline: #0066cc;
  --color-error: #a71d2a;
  --color-error-bg: #f8d7da;
  --color-success: #1e7e34;
  --color-success-bg: #d4edda;
  --color-warning: #cc7a00;
  --color-warning-bg: #fff3cd;
  
  /* ========== COLORES DE BORDES ========== */
  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  --color-border-dark: #adb5bd;
  
  /* ========== TIPOGRAFÍA ========== */
  /* Familias de fuentes */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 
                      "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", 
                      "Segoe UI Emoji", "Segoe UI Symbol";
  --font-family-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, 
                      Courier, monospace;
  
  /* Tamaños de fuente (escala modular 1.25) */
  --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: 2.25rem;    /* 36px */
  
  /* Pesos de fuente */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Altura de línea */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* ========== ESPACIADO ========== */
  --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: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* ========== BORDES Y RADIOS ========== */
  --border-width: 1px;
  --border-width-thick: 2px;
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem;    /* 8px */
  --border-radius-xl: 0.75rem;   /* 12px */
  --border-radius-full: 9999px;
  
  /* ========== SOMBRAS ========== */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  
  /* ========== TRANSICIONES ========== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* ========== Z-INDEX ========== */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* ========== LAYOUT ========== */
  --container-max-width: 1200px;
  --container-padding-mobile: var(--spacing-md);
  --container-padding-desktop: var(--spacing-lg);
  
  /* ========== BREAKPOINTS (para uso en JS) ========== */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1440px;
  
  /* ========== ACCESIBILIDAD ========== */
  /* Tamaño mínimo de área de toque (44x44px) */
  --touch-target-min: 44px;
  
  /* Ancho de outline para foco */
  --focus-outline-width: 3px;
  --focus-outline-offset: 2px;
  --focus-outline-style: solid;
}

/* ========== APLICACIÓN DE ESTILOS BASE ========== */
body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Tipografía base */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

h5 {
  font-size: var(--font-size-base);
}

h6 {
  font-size: var(--font-size-sm);
}

p {
  margin-bottom: var(--spacing-md);
}

/* Enlaces */
a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus {
  outline: var(--focus-outline-width) var(--focus-outline-style) var(--color-focus-outline);
  outline-offset: var(--focus-outline-offset);
}

/* Código */
code,
pre {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

/* Strong y emphasis */
strong,
b {
  font-weight: var(--font-weight-bold);
}

em,
i {
  font-style: italic;
}