/* =============================================================================
   LOGIN ENHANCED CSS - GobEfi Ministerio de Energía
   Diseño moderno con mejoras de UX/UI y accesibilidad WCAG 2.1
   ============================================================================= */

/* Variables CSS para consistencia y mantenibilidad */
:root {
    /* Colores institucionales */
    --primary-color: #0F69C4;
    --primary-hover: #0B4E91;
    --primary-light: #e3f2fd;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Colores neutros */
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #0F69C4 0%, #0B4E91 100%);
    --gradient-background: linear-gradient(135deg, #f0f4f8 0%, #e8eef5 50%, #dde6f0 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
    
    /* Sombras */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-focus: 0 0 0 3px rgba(15, 105, 196, 0.25);
    
    /* Bordes y redondeados */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 50px;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Tipografía */
    --font-family-primary: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-family-secondary: "Helvetica Neue", Arial, sans-serif;
    --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;
    
    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Reset y estilos base */
body.app {
    background: var(--gradient-background);
    min-height: 100vh;
    font-family: var(--font-family-primary);
    color: var(--gray-700);
    line-height: 1.6;
    padding: 0;
    margin: 0;
}

/* Contenedor principal mejorado */
.container {
    max-width: 47.5%;
    padding: var(--spacing-lg);
}

.row.justify-content-center {
    min-height: 100vh;
    align-items: center;
}

/* Tarjeta de login con diseño moderno */
.card-group {
    box-shadow: var(--shadow-xl);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card-group:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.card {
    border: none;
    background: transparent;
    border-radius: var(--border-radius-xl);
}

.card.p-4 {
    padding: 16px 16px !important;
}

.card-body {
    padding: 0;
}

/* Logo y título mejorados */
.text-xs-center.text-lg-center {
    margin-bottom: 12px;
    text-align: center;
}

.img-responsive {
    max-width: 480px;
    height: auto;
    margin-bottom: 8px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    transition: transform var(--transition-normal);
}

.img-responsive:hover {
    transform: scale(1.05);
}

/* Títulos con jerarquía visual mejorada */
h3 {
    color: var(--gray-800);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-family-secondary);
    text-align: center;
    position: relative;
}

h3::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: var(--spacing-sm) auto 0;
    border-radius: var(--border-radius-full);
}

/* Separador mejorado */
hr {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), var(--gray-300), rgba(0, 0, 0, 0));
    margin: var(--spacing-lg) 0;
}

/* Formulario mejorado */
#login-form {
    max-width: 480px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
    position: relative;
}

.form-group label {
    color: var(--gray-700);
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
    display: block;
    transition: color var(--transition-fast);
}

/* Inputs modernos con estados mejorados */
.form-control {
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    height: auto;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-focus);
    outline: none;
    background-color: var(--white);
    transform: translateY(-1px);
}

.form-control:hover {
    border-color: var(--gray-400);
}

.form-control::placeholder {
    color: var(--gray-500);
    font-style: italic;
}

/* Checkbox mejorado */
.form-check-inline {
    margin-left: var(--spacing-sm);
    cursor: pointer;
}

.form-check-inline input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-sm);
    cursor: pointer;
    accent-color: var(--primary-color);
}

.form-check-inline label {
    cursor: pointer;
    margin-bottom: 0;
    font-weight: 500;
}

/* Enlaces de acción mejorados */
.form-group a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.form-group a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.form-group a:hover {
    color: var(--primary-hover);
    text-decoration: none;
}

.form-group a:hover::after {
    width: 100%;
}

/* Layout de enlaces mejorado */
.row .form-group.w-75 {
    padding-left: 0;
}

.row .form-group.ml-5 {
    margin-left: auto !important;
    padding-right: 0;
}

/* Botón principal mejorado */
.btn-primary {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #0B4E91 0%, #0a3d7a 100%);
}

.btn-primary:focus {
    box-shadow: var(--shadow-focus);
    outline: none;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Spinner mejorado */
.spinner-border.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 2px;
    margin-right: var(--spacing-sm);
}

/* Contenedor del botón Clave Única mejorado */
.btn-cu-container {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray-200);
    position: relative;
    width: 100%;
}

.btn-cu-container::before {
    content: 'O';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    padding: 0 var(--spacing-md);
    color: var(--gray-500);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.btn-cu-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Mensajes de error mejorados */
.text-danger {
    color: var(--danger-color) !important;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(220, 53, 69, 0.1);
    border-left: 4px solid var(--danger-color);
    border-radius: var(--border-radius-sm);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* Versión mejorada */
.row p {
    text-align: center;
    color: var(--gray-500);
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-lg);
    font-style: italic;
}

/* =============================================================================
   DISEÑO RESPONSIVE
   ============================================================================= */

/* Tablets */
@media (max-width: 992px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .card.p-4 {
        padding: 17px 17px !important;
    }
    
    h3 {
        font-size: var(--font-size-2xl);
    }
    
    .img-responsive {
        max-width: 240px;
    }
    
    #login-form {
        max-width: 420px;
    }
}

/* Móviles */
@media (max-width: 768px) {
    body.app {
        padding: var(--spacing-md);
    }
    
    .container {
        max-width: 90%;
        padding: var(--spacing-sm);
    }
    
    .col-md-8 {
        max-width: 90%;
        flex: 0 0 90%;
    }
    
    .card.p-4 {
        padding: var(--spacing-lg) !important;
    }
    
    h3 {
        font-size: var(--font-size-xl);
    }
    
    .img-responsive {
        max-width: 200px;
    }
    
    #login-form {
        max-width: 100%;
    }
    
    .row .form-group.w-75,
    .row .form-group.ml-5 {
        flex: 0 0 100%;
        max-width: 100%;
        text-align: center;
        margin: var(--spacing-sm) 0;
    }
    
    .btn-primary {
        width: 100%;
        padding: var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .btn-cu-container {
        margin-top: var(--spacing-lg);
    }
}

/* Móviles pequeños */
@media (max-width: 480px) {
    .container {
        padding: var(--spacing-xs);
    }
    
    .card.p-4 {
        padding: 12px 10px !important;
    }
    
    h3 {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-sm);
    }
    
    h3::after {
        width: 40px;
        height: 3px;
    }
    
    .form-control {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .btn-primary {
        padding: var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .img-responsive {
        max-width: 160px;
        margin-bottom: 8px;
    }
    
    .text-xs-center.text-lg-center {
        margin-bottom: 16px;
    }
}

/* =============================================================================
   ACCESIBILIDAD Y MEJORAS DE UX
   ============================================================================= */

/* Focus visible para mejor accesibilidad */
.btn-primary:focus-visible,
.form-control:focus-visible,
.form-check-inline:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Soporte para modo oscuro (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .form-control {
        border-width: 3px;
    }
    
    .btn-primary {
        border: 2px solid var(--gray-900);
    }
}

/* =============================================================================
   UTILIDADES Y CLASES AUXILIARES
   ============================================================================= */

.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Clases para estados de carga */
.loading {
    pointer-events: none;
    opacity: 0.7;
}

.loading .btn-primary {
    position: relative;
}

/* Mejoras para validación */
.form-control.is-invalid {
    border-color: var(--danger-color);
    background-image: none;
}

.form-control.is-valid {
    border-color: var(--success-color);
    background-image: none;
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--danger-color);
    font-weight: 500;
}
/* Estilos adicionales para elementos específicos del login */
/* Iconos en labels */
.form-group label i {
    margin-right: 0.5rem;
    color: var(--primary-color);
    font-size: 0.9rem;
}

/* Logo oficial de Clave Única */
.btn-cu .cl-claveunica {
    text-indent: -9999px;
    width: 24px;
    height: 24px;
    background-size: 24px 24px;
    margin: auto 4px auto 0px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' fill-rule='evenodd' d='M11.47,14a.65.65,0,0,1-.21-.54.64.64,0,0,1,.29-.5.68.68,0,0,1,.53-.19.73.73,0,0,1,.49.27.75.75,0,0,1-.08,1,.7.7,0,0,1-.53.19.71.71,0,0,1-.49-.27Zm3.8-8.66A9,9,0,0,1,21,13.57a9,9,0,0,1-18,0A8.78,8.78,0,0,1,8.45,5.32c.37-.09.64-.09.82.36a.76.76,0,0,1-.36,1,7.52,7.52,0,1,0,5.82-.09.66.66,0,0,1-.4-.37.64.64,0,0,1,0-.54.62.62,0,0,1,.37-.39A.64.64,0,0,1,15.27,5.32Zm-7.77,8a4.64,4.64,0,0,1,3.75-4.59V2.33A.91.91,0,0,1,12,1.5h3.31a.75.75,0,0,1,.7.75.78.78,0,0,1-.7.75H12.75V8.76a4.5,4.5,0,0,1,3.75,4.58A4.61,4.61,0,0,1,12,18,4.61,4.61,0,0,1,7.5,13.33Zm7.5.09a3.1,3.1,0,0,0-3-3.12,3.12,3.12,0,0,0,0,6.2A3.09,3.09,0,0,0,15,13.42Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    display: inline-block;
}

.btn-cu .texto {
    text-decoration: none;
    font-size: 16px;
    padding-left: 4px;
    text-rendering: optimizeLegibility;
}

/* Ancho flexible para botón Clave Única */
.btn-cu.btn-fw {
    max-width: 550px !important;
    width: 100% !important;
    display: flex !important;
    justify-content: center !important;
    min-width: 280px !important;
}

.btn-cu-wrapper {
    width: 100% !important;
    display: flex !important;
    justify-content: center !important;
}

/* Estados de carga mejorados */
.loading .btn-primary {
    position: relative;
    pointer-events: none;
}

.loading .btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: inherit;
}

/* Responsive para enlaces de ayuda */
@media (max-width: 768px) {
    .help-links-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .help-link {
        justify-content: center;
        text-align: center;
    }
}