/**
 * ============================================
 * SISTEMA DE AUTENTICACIÓN - ESTILOS
 * ============================================
 * Diseño empresarial, moderno y profesional
 * Fácilmente personalizable mediante variables CSS
 */

/* ============================================
   VARIABLES CSS - PERSONALIZACIÓN DE TEMA
   ============================================ */
:root {
    /* Colores Principales */
    --primary-color: #6366f1;           /* Color primario (índigo suave) */
    --primary-hover: #4f46e5;           /* Hover del color primario */
    --primary-light: #818cf8;           /* Variante clara del primario */
    --primary-dark: #4338ca;            /* Variante oscura del primario */
    
    /* Colores Secundarios */
    --secondary-color: #8b5cf6;         /* Color secundario (púrpura) */
    --secondary-hover: #7c3aed;         /* Hover del secundario */
    
    /* Colores de Fondo */
    --bg-primary: #f8fafc;              /* Fondo principal (gris muy claro) */
    --bg-secondary: #ffffff;            /* Fondo secundario (blanco) */
    --bg-gradient-start: #667eea;       /* Inicio del gradiente */
    --bg-gradient-end: #764ba2;         /* Fin del gradiente */
    
    /* Colores de Texto */
    --text-primary: #1e293b;            /* Texto principal (gris oscuro) */
    --text-secondary: #64748b;          /* Texto secundario (gris medio) */
    --text-light: #94a3b8;              /* Texto claro */
    
    /* Colores de Estado */
    --success-color: #10b981;           /* Verde éxito */
    --error-color: #ef4444;             /* Rojo error */
    --warning-color: #f59e0b;           /* Amarillo advertencia */
    --info-color: #3b82f6;              /* Azul información */
    
    /* 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);
    --shadow-card: 0 4px 20px rgba(99, 102, 241, 0.08);
    
    /* Bordes */
    --border-radius-sm: 0.375rem;       /* 6px */
    --border-radius-md: 0.5rem;         /* 8px */
    --border-radius-lg: 0.75rem;        /* 12px */
    --border-radius-xl: 1rem;           /* 16px */
    --border-radius-2xl: 1.5rem;        /* 24px */
    --border-color: #e2e8f0;            /* Color de borde */
    
    /* Espaciado */
    --spacing-xs: 0.5rem;               /* 8px */
    --spacing-sm: 0.75rem;              /* 12px */
    --spacing-md: 1rem;                 /* 16px */
    --spacing-lg: 1.5rem;               /* 24px */
    --spacing-xl: 2rem;                 /* 32px */
    --spacing-2xl: 3rem;                /* 48px */
    
    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ============================================
   RESET Y ESTILOS BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.auth-page {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   CONTENEDOR PRINCIPAL
   ============================================ */
.auth-container {
    width: 100%;
    max-width: 450px;
    position: relative;
}

.auth-wrapper {
    position: relative;
    width: 100%;
}

/* ============================================
   TARJETA DE AUTENTICACIÓN
   ============================================ */
.auth-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInUp 0.5s ease-out;
    position: relative;
    overflow: hidden;
}

/* Efecto de brillo sutil en la tarjeta */
.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0.8;
}

/* Animación de entrada */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HEADER DE LA TARJETA
   ============================================ */
.auth-card-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-icon-wrapper {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    position: relative;
}

.auth-icon-wrapper::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: var(--border-radius-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0.3;
    z-index: -1;
    filter: blur(8px);
}

.auth-icon-wrapper i {
    font-size: 2rem;
    color: white;
}

.auth-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.025em;
}

.auth-subtitle {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ============================================
   FORMULARIO
   ============================================ */
.auth-form {
    margin-bottom: var(--spacing-lg);
}

/* Campos de formulario personalizados */
.form-floating {
    position: relative;
}

.form-floating > .form-control {
    height: calc(3.5rem + 2px);
    padding: 1rem 0.75rem 0.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    background-color: var(--bg-primary);
    transition: all var(--transition-base);
    font-size: 0.9375rem;
}

.form-floating > .form-control:focus {
    border-color: var(--primary-color);
    background-color: var(--bg-secondary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    outline: none;
}

.form-floating > label {
    padding: 1rem 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: all var(--transition-base);
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
    color: var(--primary-color);
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
    opacity: 0.9;
}

/* Estados de validación */
.form-control.is-invalid {
    border-color: var(--error-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23ef4444'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='m5.8 3.6 .4.4.4-.4m0 4.8-.4-.4-.4.4'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-valid {
    border-color: var(--success-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2310b981' d='m2.3 6.73.98-.98-.98-.98L2.3 6.73zm1.4-1.4.98-.98-.98-.98-1.4 1.4z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--error-color);
    font-weight: 500;
}

/* Mostrar mensajes de error solo cuando el campo es inválido */
.form-control.is-invalid ~ .invalid-feedback,
.form-check-input.is-invalid ~ .invalid-feedback,
.was-validated .form-control:invalid ~ .invalid-feedback,
.was-validated .form-check-input:invalid ~ .invalid-feedback {
    display: block;
}

/* Checkbox personalizado */
.form-check-input {
    width: 1.125rem;
    height: 1.125rem;
    margin-top: 0.125rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.form-check-input.is-invalid:focus {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-check-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

/* ============================================
   BOTONES
   ============================================ */
.btn-auth {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    text-transform: none;
    letter-spacing: 0.01em;
}

.btn-primary.btn-auth {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary.btn-auth:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-hover), var(--secondary-hover));
}

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

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

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

.btn-auth:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ============================================
   INDICADOR DE FUERZA DE CONTRASEÑA
   ============================================ */
.password-strength {
    margin-top: -0.5rem;
}

.password-strength-bar {
    height: 4px;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.password-strength-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
    background: linear-gradient(90deg, var(--error-color), var(--warning-color), var(--success-color));
}

.password-strength-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================
   DIVISOR
   ============================================ */
.auth-divider {
    text-align: center;
    margin: var(--spacing-xl) 0;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    position: relative;
    background: var(--bg-secondary);
    padding: 0 var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ============================================
   ENLACES
   ============================================ */
.text-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.text-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ============================================
   ALERTAS
   ============================================ */
.alert {
    border-radius: var(--border-radius-lg);
    border: none;
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.25rem;
    font-size: 0.9375rem;
    max-width: 90%;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.alert i {
    font-size: 1.125rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 576px) {
    body.auth-page {
        min-height: 120vh;
        padding-bottom: 100px;
    }
    
    .auth-card {
        padding: var(--spacing-xl);
        border-radius: var(--border-radius-xl);
    }
    
    .auth-title {
        font-size: 1.5rem;
    }
    
    .auth-icon-wrapper {
        width: 56px;
        height: 56px;
    }
    
    .auth-icon-wrapper i {
        font-size: 1.75rem;
    }
}

/* ============================================
   UTILIDADES ADICIONALES
   ============================================ */
.btn-spinner {
    display: inline-flex;
    align-items: center;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

/* Efecto de carga en botones */
.btn-auth.loading .btn-text {
    display: none;
}

.btn-auth.loading .btn-spinner {
    display: inline-flex !important;
}

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

.shake {
    animation: shake 0.5s;
}