:root {
    --primary-color: #3498db;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #f39c12;
    --dark-bg: #2c3e50;
    --light-bg: #34495e;
    --light-text: #ecf0f1;
    --secondary-text: #bdc3c7;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--dark-bg);
    color: white;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    width: 90%;
    max-width: 800px;
    text-align: center;
}

h1 { color: var(--light-text); margin-bottom: 25px; }

a { color: var(--primary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- NUEVOS ESTILOS PARA EL LOGO --- */
.logo-container {
    text-align: center;
    margin-bottom: 20px;
}
.logo-img {
    max-height: 80px; /* Ajusta este valor según el tamaño de tu logo */
    width: auto;
}
.header .logo-img {
    max-height: 60px; /* Un poco más pequeño en el encabezado */
}
.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}
/* --- FIN DE ESTILOS PARA EL LOGO --- */


/* Formularios */
.form-group { margin-bottom: 20px; text-align: left; }
label { display: block; margin-bottom: 8px; font-weight: bold; color: var(--light-text); }
input[type="text"], input[type="password"], input[type="number"], select, input[type="date"] {
    width: 100%;
    padding: 12px;
    border-radius: 5px;
    border: 1px solid #7f8c8d;
    background-color: var(--dark-bg);
    color: white;
    font-size: 1em;
    box-sizing: border-box;
}

.submit-btn, .nav-item, .logout-btn, .download-btn, .cancel-btn, .action-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    transition: background-color 0.3s;
    text-decoration: none;
    margin: 5px;
}

.submit-btn:hover { background-color: #2980b9; }

/* Dashboard */
.header { display: flex; flex-direction: column; align-items: center; gap: 10px; }
@media screen and (min-width: 768px) {
    .header { flex-direction: row; justify-content: space-between; }
}

.logout-btn { background-color: var(--error-color); font-size: 0.9em; padding: 8px 15px; }
.delete-btn { background-color: var(--error-color); }
.dashboard-nav { margin: 20px 0; border-top: 1px solid var(--secondary-text); border-bottom: 1px solid var(--secondary-text); padding: 15px 0; }
.action-link { font-size: 0.9em; font-weight: bold; }

/* Mensajes */
.result-box { margin-top: 25px; font-size: 1.1em; font-weight: bold; padding: 15px; border-radius: 8px; }
.result-success, .success { background-color: var(--success-color); color: white; }
.result-error, .error { background-color: var(--error-color); color: white; }
.result-validating, .warning { background-color: var(--warning-color); color: white; }

/* Filtros */
.filter-form { margin-bottom: 20px; }
.filter-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin-bottom: 15px; }


/* Tablas */
.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; }
th, td { padding: 12px; border-bottom: 1px solid var(--secondary-text); text-align: left; }
th { background-color: rgba(0,0,0,0.2); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* Paginación */
.pagination { margin-top: 20px; }
.pagination a, .pagination span { margin: 0 5px; }


/* --- ESTILOS RESPONSIVOS PARA MÓVILES --- */
@media screen and (max-width: 768px) {
    .container { padding: 15px; }
    .header { text-align: center; }
    
    .table-container table { border: 0; }
    .table-container table thead {
        border: none;
        clip: rect(0 0 0 0);
        height: 1px;
        margin: -1px;
        overflow: hidden;
        padding: 0;
        position: absolute;
        width: 1px;
    }

    .table-container table tr {
        display: block;
        margin-bottom: 1em;
        border-radius: 8px;
        background-color: var(--dark-bg);
        box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    }

    .table-container table td {
        display: block;
        text-align: right;
        border-bottom: 1px dotted var(--secondary-text);
        padding: 10px;
    }

    .table-container table td::before {
        content: attr(data-label);
        float: left;
        font-weight: bold;
        text-transform: uppercase;
        color: var(--light-text);
    }

    .table-container table td:last-child {
        border-bottom: 0;
    }

    .filter-grid {
        grid-template-columns: 1fr;
    }

    /* Estilos para la página de asignación de QR */
    .qr-assignment-container {
        flex-direction: column;
    }
    .qr-list {
        height: 60vh; /* Cada lista ocupa una parte importante de la pantalla */
        max-height: 500px; /* Límite para pantallas muy largas */
    }
    .qr-items-container {
        max-height: 100%; /* Permite que flexbox controle la altura */
    }
    .qr-list .submit-btn {
        width: 100%;
        box-sizing: border-box;
        flex-shrink: 0; /* Evita que el botón se encoja */
        margin-top: 15px;
    }
    .search-form {
        flex-direction: column;
    }
    .search-form .submit-btn {
        width: 100%;
    }
     /* Scrollbar más visible en navegadores compatibles */
    .qr-items-container::-webkit-scrollbar { width: 8px; }
    .qr-items-container::-webkit-scrollbar-track { background: var(--dark-bg); }
    .qr-items-container::-webkit-scrollbar-thumb { background-color: var(--primary-color); border-radius: 4px; }
}