/**
 * Design Tokens - Aprender21
 * Sistema de variables CSS para diseño consistente y mantenible
 * Creado: 2025
 */

:root {
  /* ========== COLORES PRINCIPALES ========== */
  
  /* Primary (Azul profesional moderno) */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;  /* Principal */
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;
  
  /* Secondary (Verde éxito moderno) */
  --color-secondary-50: #f0fdf4;
  --color-secondary-100: #dcfce7;
  --color-secondary-200: #bbf7d0;
  --color-secondary-300: #86efac;
  --color-secondary-400: #4ade80;
  --color-secondary-500: #22c55e;
  --color-secondary-600: #16a34a;  /* Principal */
  --color-secondary-700: #15803d;
  --color-secondary-800: #166534;
  --color-secondary-900: #14532d;
  
  /* Accent (Naranja para CTAs secundarios) */
  --color-accent-50: #fff7ed;
  --color-accent-100: #ffedd5;
  --color-accent-200: #fed7aa;
  --color-accent-300: #fdba74;
  --color-accent-400: #fb923c;
  --color-accent-500: #f97316;
  --color-accent-600: #ea580c;
  --color-accent-700: #c2410c;
  --color-accent-800: #9a3412;
  --color-accent-900: #7c2d12;
  
  /* ========== COLORES NEUTRALES ========== */
  --color-white: #ffffff;
  --color-black: #000000;
  
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-gray-950: #030712;
  
  /* ========== COLORES SEMÁNTICOS ========== */
  --color-success: #22c55e;
  --color-success-light: #86efac;
  --color-success-dark: #15803d;
  
  --color-warning: #f59e0b;
  --color-warning-light: #fbbf24;
  --color-warning-dark: #d97706;
  
  --color-error: #ef4444;
  --color-error-light: #f87171;
  --color-error-dark: #dc2626;
  
  --color-info: #3b82f6;
  --color-info-light: #60a5fa;
  --color-info-dark: #2563eb;
  
  /* ========== ESPACIADO ========== */
  --space-0: 0;
  --space-px: 1px;
  --space-0-5: 0.125rem;   /* 2px */
  --space-1: 0.25rem;      /* 4px */
  --space-1-5: 0.375rem;   /* 6px */
  --space-2: 0.5rem;       /* 8px */
  --space-2-5: 0.625rem;   /* 10px */
  --space-3: 0.75rem;      /* 12px */
  --space-3-5: 0.875rem;   /* 14px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-7: 1.75rem;      /* 28px */
  --space-8: 2rem;         /* 32px */
  --space-9: 2.25rem;      /* 36px */
  --space-10: 2.5rem;      /* 40px */
  --space-11: 2.75rem;     /* 44px */
  --space-12: 3rem;        /* 48px */
  --space-14: 3.5rem;      /* 56px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-32: 8rem;        /* 128px */
  
  /* ========== TIPOGRAFÍA ========== */
  
  /* Familias de fuentes */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  --font-serif: 'Georgia', 'Cambria', 'Times New Roman', serif;
  --font-mono: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
  
  /* Tamaños de fuente */
  --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 */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  --font-size-7xl: 4.5rem;      /* 72px */
  
  /* Pesos de fuente */
  --font-weight-thin: 100;
  --font-weight-extralight: 200;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;
  
  /* Altura de línea */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Espaciado de letras */
  --letter-spacing-tighter: -0.05em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* ========== SOMBRAS ========== */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  --shadow-none: 0 0 #0000;
  
  /* Sombras de colores */
  --shadow-primary: 0 10px 15px -3px rgb(37 99 235 / 0.3);
  --shadow-secondary: 0 10px 15px -3px rgb(22 163 74 / 0.3);
  
  /* ========== BORDER RADIUS ========== */
  --radius-none: 0;
  --radius-sm: 0.25rem;      /* 4px */
  --radius-base: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;       /* 8px */
  --radius-lg: 0.75rem;      /* 12px */
  --radius-xl: 1rem;         /* 16px */
  --radius-2xl: 1.5rem;      /* 24px */
  --radius-3xl: 2rem;        /* 32px */
  --radius-full: 9999px;
  
  /* ========== TRANSICIONES ========== */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Timing 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-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* ========== Z-INDEX ========== */
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* ========== BREAKPOINTS (para referencia en JS) ========== */
  --screen-sm: 640px;
  --screen-md: 768px;
  --screen-lg: 1024px;
  --screen-xl: 1280px;
  --screen-2xl: 1536px;
  
  /* ========== ANCHOS MÁXIMOS ========== */
  --max-width-xs: 20rem;      /* 320px */
  --max-width-sm: 24rem;      /* 384px */
  --max-width-md: 28rem;      /* 448px */
  --max-width-lg: 32rem;      /* 512px */
  --max-width-xl: 36rem;      /* 576px */
  --max-width-2xl: 42rem;     /* 672px */
  --max-width-3xl: 48rem;     /* 768px */
  --max-width-4xl: 56rem;     /* 896px */
  --max-width-5xl: 64rem;     /* 1024px */
  --max-width-6xl: 72rem;     /* 1152px */
  --max-width-7xl: 80rem;     /* 1280px */
  --max-width-full: 100%;
  
  /* ========== OPACITY ========== */
  --opacity-0: 0;
  --opacity-5: 0.05;
  --opacity-10: 0.1;
  --opacity-20: 0.2;
  --opacity-25: 0.25;
  --opacity-30: 0.3;
  --opacity-40: 0.4;
  --opacity-50: 0.5;
  --opacity-60: 0.6;
  --opacity-70: 0.7;
  --opacity-75: 0.75;
  --opacity-80: 0.8;
  --opacity-90: 0.9;
  --opacity-95: 0.95;
  --opacity-100: 1;
  
  /* ========== BLUR ========== */
  --blur-none: 0;
  --blur-sm: 4px;
  --blur-base: 8px;
  --blur-md: 12px;
  --blur-lg: 16px;
  --blur-xl: 24px;
  --blur-2xl: 40px;
  --blur-3xl: 64px;
}

/* ========== DARK MODE SUPPORT (preparado para futuro) ========== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Aquí se pueden definir valores alternativos para dark mode */
    /* Por ahora comentados, activar cuando se implemente dark mode */
    /*
    --color-primary-600: #3b82f6;
    --color-gray-50: #1f2937;
    --color-gray-900: #f9fafb;
    */
  }
}

/* ========== UTILITY: Smooth Scroll ========== */
html {
  scroll-behavior: smooth;
}

/* ========== UTILITY: Focus Visible (accesibilidad) ========== */
*:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* ========== UTILITY: Transitions por defecto ========== */
* {
  transition-timing-function: var(--ease-in-out);
}