/* Variables CSS para la Paleta de Colores */
:root {
    --primary-color: #4A76C2;
    --accent-color: #FFD700;
    --bg-light: #F0F2F5;
    --bg-card: #FFFFFF;
    --text-dark: #212529;
    --text-secondary: #6C757D;
    --success-color: #28A745;
    --danger-color: #DC3545;
    --info-color: #17A2B8;

    /* Nuevas variables para consistencia */
    --border-radius-base: 8px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* Estilos Globales y Reseteo Básico */
html {
    height: 100%;
}

body {
    font-family: 'Lato', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    display: flex;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

/* Contenedor principal de la aplicación (sidebar + content) */
.app-container {
    display: flex;
    width: 100%;
    flex-grow: 1;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius-base);
    overflow: hidden;
    height: 100%;
}

/* Sidebar de Navegación Lateral */
.sidebar {
    width: 250px;
    background: var(--primary-color);
    color: #ffffff;
    padding: 20px 0;
    box-shadow: 3px 0 15px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    text-align: center;
    padding: 10px 0 30px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 20px;
}

.sidebar-header h2 {
    margin: 0;
    font-size: 2.5em;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}

/* Navegación dentro del Sidebar */
.main-nav {
    flex-grow: 1;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.main-nav li {
    margin: 0;
}

.main-nav a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 15px 25px;
    display: block;
    transition: all var(--transition-normal);
    border-left: 5px solid transparent;
    font-size: 1.1em;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.main-nav a:hover {
    color: #ffffff;
    background-color: rgba(0, 0, 0, 0.1);
    border-left-color: var(--accent-color);
    font-weight: 600;
}

.main-nav a.active-nav {
    color: #ffffff;
    background-color: rgba(0, 0, 0, 0.2);
    border-left-color: var(--accent-color);
    font-weight: 700;
}

/* Contenido Principal (derecha del sidebar) */
.main-content {
    flex-grow: 1;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    overflow-y: auto;
    height: 100%;
    box-sizing: border-box;
}

.content-header {
    background-color: var(--bg-card);
    padding: 25px 30px;
    margin-bottom: 0;
    border-radius: var(--border-radius-base);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    border-bottom: 3px solid var(--accent-color);
}

.content-header h1 {
    margin: 0;
    font-size: 2.5em;
    font-weight: 700;
    color: var(--text-dark);
}

/* Estilos de los Contadores del Dashboard */
.dashboard-counters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    padding: 0;
}

.counter-card {
    background-color: var(--bg-card);
    padding: 30px;
    border-radius: var(--border-radius-base);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    border-top: 5px solid transparent;
}

.counter-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.counter-card h3 {
    color: var(--text-secondary);
    margin-top: 0;
    font-size: 1.1em;
    margin-bottom: 15px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.counter-card p {
    font-size: 3.2em;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    line-height: 1;
}

/* Colores personalizados para cada tipo de contador */
#total-clientes, #total-clientes ~ h3 { color: var(--text-dark); }
#clientes-activos-count, #clientes-activos-count ~ h3 { color: var(--success-color); }
#clientes-por-vencer-count, #clientes-por-vencer-count ~ h3 { color: var(--accent-color); }
#clientes-vencidos-count, #clientes-vencidos-count ~ h3 { color: var(--danger-color); }
#campanas-activas-count, #campanas-activas-count ~ h3 { color: var(--info-color); }

/* Añadir bordes de color a las tarjetas */
.counter-card:nth-child(1) { border-top-color: var(--text-dark); }
.counter-card:nth-child(2) { border-top-color: var(--success-color); }
.counter-card:nth-child(3) { border-top-color: var(--accent-color); }
.counter-card:nth-child(4) { border-top-color: var(--danger-color); }
.counter-card:nth-child(5) { border-top-color: var(--info-color); }

/* Secciones de Clientes */
.cliente-section {
    background-color: var(--bg-card);
    padding: 30px;
    margin-bottom: 0;
    border-radius: var(--border-radius-base);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.cliente-section h2 {
    color: var(--text-dark);
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 2em;
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 15px;
    font-weight: 700;
}

/* Clase para ocultar secciones */
.cliente-section.hidden {
    display: none;
}

/* Estilos de Tabla */
.table-responsive {
    overflow-x: auto;
}

.client-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px;
    margin-top: 20px;
    background-color: transparent;
}

.client-table thead tr {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius-base);
    overflow: hidden;
}

.client-table th,
.client-table td {
    padding: 15px 18px;
    text-align: left;
    font-size: 0.95em;
    background-color: var(--bg-card);
    border: none;
}

.client-table th {
    background-color: var(--primary-color);
    color: #ffffff;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9em;
    letter-spacing: 0.5px;
    position: relative;
    padding: 18px;
}

/* Redondear bordes del encabezado */
.client-table thead tr th:first-child {
    border-top-left-radius: var(--border-radius-base);
    border-bottom-left-radius: var(--border-radius-base);
}

.client-table thead tr th:last-child {
    border-top-right-radius: var(--border-radius-base);
    border-bottom-right-radius: var(--border-radius-base);
}

/* Estilos para encabezados de columna ordenables */
.client-table th[data-sort] {
    cursor: pointer;
    user-select: none;
    padding-right: 30px;
}

.client-table th[data-sort]:hover {
    background-color: #5c73d4;
}

/* Estilos para el icono de ordenamiento */
.sort-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8em;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.client-table th[data-sort]:hover .sort-icon {
    color: #ffffff;
}

/* Clases para indicar el estado de ordenamiento */
.sort-asc .sort-icon::before { content: '▲'; }
.sort-desc .sort-icon::before { content: '▼'; }

/* Filas del cuerpo de la tabla */
.client-table tbody tr {
    transition: all var(--transition-fast);
    border-radius: var(--border-radius-base);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.client-table tbody tr:hover {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

/* Estilos para las filas alternas */
.client-table tbody tr:nth-child(odd) {
    background-color: var(--bg-card);
}
.client-table tbody tr:nth-child(even) {
    background-color: var(--bg-light);
}

/* Botones de acción en la tabla */
.client-table td button {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 8px 12px;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    margin-right: 8px;
    white-space: nowrap;
}
.client-table td button:last-child {
    margin-right: 0;
}
.client-table td button.view-btn {
    color: var(--info-color);
    border-color: var(--info-color);
}
.client-table td button.delete-btn {
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.client-table td button:hover {
    background-color: var(--primary-color);
    color: white;
}
.client-table td button.view-btn:hover {
    background-color: var(--info-color);
    color: white;
}
.client-table td button.delete-btn:hover {
    background-color: var(--danger-color);
    color: white;
}

/* Estilos para el campo de búsqueda y el filtro */
.client-controls {
    margin-bottom: 20px;
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.search-input {
    flex-grow: 1;
    max-width: 300px;
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    background-color: var(--bg-card);
    color: var(--text-dark);
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(105, 132, 237, 0.2);
    outline: none;
}

.filter-select {
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 1em;
    background-color: var(--bg-card);
    color: var(--text-dark);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-repeat: no-repeat;
    background-position: right 0.7em top 50%, 0 0;
    background-size: 0.8em auto;
    cursor: pointer;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.filter-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(105, 132, 237, 0.2);
    outline: none;
}

/* Estilos para los controles de paginación */
.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 25px;
    gap: 10px;
    flex-wrap: wrap;
}

.pagination-controls button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 18px;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    font-size: 0.95em;
    transition: all var(--transition-normal);
    min-width: 40px;
    text-align: center;
}

.pagination-controls button:hover:not(:disabled) {
    background-color: #5c73d4;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.pagination-controls button:disabled {
    background-color: #e0e0e0;
    color: #a0a0a0;
    cursor: not-allowed;
    opacity: 0.8;
}

.pagination-controls .page-info {
    color: var(--text-dark);
    font-weight: 600;
    font-size: 1em;
    padding: 5px 10px;
}

.pagination-controls .page-number {
    background-color: var(--bg-card);
    color: var(--text-dark);
    border: 1px solid #ced4da;
    padding: 10px 14px;
    border-radius: var(--border-radius-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.pagination-controls .page-number.active {
    background-color: var(--accent-color);
    color: var(--text-dark);
    border-color: var(--accent-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.pagination-controls .page-number:hover:not(.active) {
    background-color: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Media Queries para responsividad */
@media (max-width: 768px) {
    html, body {
        overflow: visible;
    }
    .app-container {
        flex-direction: column;
        min-height: auto;
        border-radius: 0;
        box-shadow: none;
        height: auto;
    }

    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        padding: 15px 0;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        border-radius: 0;
        overflow-y: visible;
    }

    .main-content {
        height: auto;
        overflow-y: visible;
    }

    .client-controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .search-input {
        width: 100%;
        max-width: 100%;
    }
    .filter-select {
        width: 100%;
    }
    .pagination-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    .pagination-controls button,
    .pagination-controls .page-number {
        padding: 8px 10px;
        font-size: 0.85em;
    }

    /* INICIO DE CÓDIGO DE FRAGMENTO INTEGRADO (ACTUALIZADO 2) */
    /* Ocultar el encabezado de la tabla para móviles */
    .client-table thead {
        display: none;
    }

    /* Convertir el cuerpo, filas y celdas en bloques */
    .client-table,
    .client-table tbody,
    .client-table tr,
    .client-table td {
        display: block;
        width: 100%;
        box-sizing: border-box; /* Asegura que el padding no cause desbordamiento */
    }

    /* Estilos para cada "tarjeta" de cliente */
    .client-table tr {
        margin-bottom: 15px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        border-radius: var(--border-radius-base);
        background-color: var(--bg-card);
    }

    /* Estilos para cada celda "fila" de la tarjeta */
    .client-table td {
        text-align: right; /* Alineamos el valor a la derecha */
        padding: 12px 15px; /* Más padding para evitar que se salga el texto */
        position: relative;
        border-bottom: 1px solid var(--bg-light);
        word-break: break-word; /* Rompe palabras largas para evitar desbordamiento */
    }

    /* Mostrar la etiqueta (data-label) a la izquierda del dato */
    .client-table td:not(:last-child)::before {
        content: attr(data-label);
        position: absolute;
        left: 15px;
        font-weight: 700;
        color: var(--text-dark);
        text-align: left;
    }

    /* Ocultar la etiqueta en la última celda */
    .client-table td:last-child::before {
        content: none;
    }

    /* Ajuste para los botones de acción */
    .client-table td:last-child {
        text-align: center; /* Centrar los botones de acción */
        border-bottom: none; /* Eliminar el borde de la última fila */
    }
    .client-table td button {
        display: inline-block;
        margin: 5px;
    }
    /* FIN DE CÓDIGO DE FRAGMENTO INTEGRADO (ACTUALIZADO 2) */
}

/* --- ESTILOS PARA EL MODAL DE DETALLE DEL CLIENTE --- */
#detail-client-modal .modal-content {
    max-width: 900px;
}

#detail-client-modal h2 {
    font-size: 2em;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 20px;
    color: var(--primary-color);
    text-align: center;
}

/* Contenedor principal para los detalles */
.client-detail-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .client-detail-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.client-detail-grid div {
    background-color: var(--bg-light);
    padding: 15px;
    border-radius: var(--border-radius-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.client-detail-grid strong {
    font-weight: 700;
    color: var(--text-dark);
    font-size: 0.9em;
    margin-bottom: 5px;
    display: block;
    text-transform: uppercase;
}

.client-detail-grid span {
    color: var(--text-secondary);
    font-size: 1em;
    word-wrap: break-word;
}

.client-detail-grid a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.client-detail-grid a:hover {
    color: var(--accent-color);
}

/* Estilos específicos para el logotipo */
.client-detail-logotipo {
    grid-column: span 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-color: transparent;
    padding: 0;
    box-shadow: none;
}

.logotipo-preview-image {
    max-width: 150px;
    height: auto;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius-base);
    margin-top: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
}


/* --- ESTILOS PARA EL MODAL Y FORMULARIO POR PASOS (Ya existentes) --- */

/* 1. Estilos del Overlay y del Contenido del Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-card);
    padding: 35px;
    border-radius: var(--border-radius-base);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 700px;
    width: 90%;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-normal) cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.visible .modal-content {
    transform: scale(1);
}

.modal-content h2 {
    margin-top: 0;
    color: var(--text-dark);
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 15px;
    margin-bottom: 25px;
    font-size: 2.2em;
    font-weight: 700;
}

.close-button {
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 2.8em;
    font-weight: 300;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-normal), transform var(--transition-fast);
}

.close-button:hover {
    color: var(--danger-color);
    transform: rotate(90deg);
}

/* 2. Estilos de la Barra de Progreso */
.modal-header {
    text-align: center;
    padding-bottom: 25px;
}

.progress-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
    padding: 0 10px;
    margin-top: 20px;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: #e0e0e0;
    transform: translateY(-50%);
    z-index: 0;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 1;
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 600;
    transition: color var(--transition-normal);
    flex: 1;
    text-align: center;
}

.progress-step::before {
    content: '';
    display: block;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: #e0e0e0;
    margin-bottom: 8px;
    border: 4px solid var(--bg-card);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
    box-shadow: 0 0 0 3px #e0e0e0;
}

.progress-step.active {
    color: var(--primary-color);
}

.progress-step.active::before {
    background-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color);
}

/* 3. Estilos del Contenido de los Pasos del Formulario */
.form-step {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.form-step.active {
    display: block;
}

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

.client-form h3 {
    font-size: 1.5em;
    font-weight: 700;
    margin-bottom: 25px;
    color: var(--primary-color);
    text-align: center;
}

.client-form .form-group {
    margin-bottom: 20px;
}

.client-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.client-form input[type="text"],
.client-form input[type="tel"],
.client-form input[type="email"],
.client-form input[type="number"],
.client-form input[type="date"],
.client-form input[type="url"],
.client-form input[type="password"],
.client-form textarea,
.client-form select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius-base);
    box-sizing: border-box;
    font-size: 1em;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
    background-color: var(--bg-light);
    color: var(--text-dark);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    font-family: inherit;
}

.client-form input:focus,
.client-form textarea:focus,
.client-form select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(74, 118, 194, 0.2);
    outline: none;
    background-color: var(--bg-card);
}

.switch-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 25px;
    padding: 10px 0;
}
.switch-group label {
    margin-bottom: 0;
    font-weight: 700;
    color: var(--primary-color);
}
.form-step .form-group label {
    font-weight: 500;
    color: var(--text-dark);
}
.form-step h3 {
    margin-top: 0;
}

/* 4. Estilos para el campo de subida de archivo personalizado */
.custom-file-upload-container {
    position: relative;
    display: block;
    width: 100%;
}

.custom-file-upload {
    background-color: var(--bg-light);
    border: 1px solid #ced4da;
    border-radius: var(--border-radius-base);
    padding: 12px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.custom-file-upload:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(74, 118, 194, 0.2);
}

.custom-file-upload.input-error {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.2);
}

.custom-file-upload .file-icon {
    margin-right: 12px;
    font-size: 1.2em;
    color: var(--text-secondary);
}

.custom-file-upload #file-name {
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
}

.custom-file-upload.has-file #file-name {
    color: var(--text-dark);
}

.client-form input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 1;
}

/* 5. Estilos para los botones del formulario */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
}

.btn-prev, .btn-next {
    background-color: var(--primary-color);
    color: white;
    padding: 14px 24px;
    border: none;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

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

.btn-prev:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-next:hover {
    background-color: #3b60a1;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-submit {
    background-color: var(--success-color);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all var(--transition-normal);
    display: block;
    width: 100%;
    margin-top: 25px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn-submit:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* 6. Estilos para el Botón Flotante (FAB) */
.add-client-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--accent-color);
    color: var(--text-dark);
    width: 65px;
    height: 65px;
    border-radius: 50%;
    font-size: 3em;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    border: none;
    transition: background-color var(--transition-normal), transform var(--transition-fast);
    z-index: 1000;
}

.add-client-fab:hover {
    background-color: #e0a800;
    transform: translateY(-3px);
}

/* 7. Estilos para el Overlay del Spinner Global */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal);
}

.spinner-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Animación y estilo del Spinner */
.spinner {
    border: 8px solid rgba(255, 255, 255, 0.3);
    border-top: 8px solid var(--accent-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.spinner-overlay p {
    color: #ffffff;
    font-size: 1.3em;
    font-weight: bold;
}

/* 8. Estilos para el pie de página de la barra lateral (donde irá el botón de logout) */
.sidebar-footer {
    margin-top: auto;
    padding: 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.btn-logout {
    background-color: var(--danger-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: background-color var(--transition-normal), transform var(--transition-fast);
    width: 100%;
}

.btn-logout:hover {
    background-color: #bd2130;
    transform: translateY(-2px);
}