/* ========================================
   VARIABLES CSS - SISTEMA DE DISEÑO EEMEC
   Basado en los colores del logo corporativo
   ======================================== */

:root {
    /* === COLORES PRIMARIOS === */
    --color-primary: #1B4F8C;           /* Azul principal del logo */
    --color-primary-dark: #143D6F;      /* Azul oscuro (hover/active) */
    --color-primary-light: #2563EB;     /* Azul claro (acentos) */
    
    /* === COLORES SECUNDARIOS === */
    --color-secondary: #FF8100;         /* Naranja del logo */
    --color-secondary-dark: #E67300;    /* Naranja oscuro (hover) */
    --color-secondary-light: #FFA040;   /* Naranja claro */
    
    /* === COLORES NEUTRALES === */
    --color-text-primary: #1F2937;      /* Texto principal */
    --color-text-secondary: #6B7280;    /* Texto secundario */
    --color-text-light: #9CA3AF;        /* Texto claro */
    --color-background: #FFFFFF;        /* Fondo blanco */
    --color-background-gray: #F9FAFB;   /* Fondo gris claro */
    --color-border: #E5E7EB;            /* Bordes */
    
    /* === COLORES DE ESTADO === */
    --color-success: #10B981;           /* Verde éxito */
    --color-error: #EF4444;             /* Rojo error */
    --color-warning: #F59E0B;           /* Amarillo advertencia */
    --color-info: #3B82F6;              /* Azul info */
    
    /* === TIPOGRAFÍA === */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-secondary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* 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 */
    
    /* Pesos de fuente */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* === ESPACIADOS === */
    --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 */
    
    /* === BORDES Y SOMBRAS === */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* === TRANSICIONES === */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* === Z-INDEX === */
    --z-dropdown: 50;
    --z-sticky: 100;
    --z-fixed: 150;
    --z-modal: 200;
    --z-popover: 250;
    --z-tooltip: 300;
}

/* ========================================
   CLASES UTILITARIAS REUTILIZABLES
   ======================================== */

/* Navegación: animación de subrayado consistente */
.nav-link {
    position: relative;
    transition: color 200ms ease;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: var(--color-primary, #1B4F8C);
    transition: width 250ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--color-primary, #1B4F8C);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
    width: 100%;
}

/* === BOTONES === */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: white;
}

/* === ENLACES === */
.link {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.link-secondary {
    color: var(--color-secondary);
}

.link-secondary:hover {
    color: var(--color-secondary-dark);
}

/* === TARJETAS === */
.card {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* === BADGES === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.badge-primary {
    background-color: rgba(27, 79, 140, 0.1);
    color: var(--color-primary);
}

.badge-secondary {
    background-color: rgba(255, 129, 0, 0.1);
    color: var(--color-secondary);
}

/* === FORMULARIOS === */
.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-family: var(--font-family-primary);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(27, 79, 140, 0.1);
}

.form-input:invalid {
    border-color: var(--color-error);
}

.form-input:valid {
    border-color: var(--color-success);
}

/* === UTILIDADES DE TEXTO === */
.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-secondary);
}

.text-muted {
    color: var(--color-text-secondary);
}

/* === UTILIDADES DE FONDO === */
.bg-primary {
    background-color: var(--color-primary);
}

.bg-secondary {
    background-color: var(--color-secondary);
}

.bg-gray {
    background-color: var(--color-background-gray);
}

/* === GRADIENTES === */
.gradient-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

.gradient-secondary {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
}