body {
    background-color: #202020;
    font-family: Arial, sans-serif;
    color: white;
    margin: 0;
    padding: 20px;
}

.encabezado {
    text-align: center;
    margin-bottom: 30px;
}

.titulo-uce { color: #248be0; margin: 10px; }
.titulo-blanco { color: white; margin: 5px; font-weight: normal; }
.titulo-verde { color: #7ce011; margin: 15px; font-size: 1.4em; }
.subtitulo-azul { color: #248be0; border-bottom: 1px solid #505050; padding-bottom: 10px; }

.img-banner {
    width: 100%;
    max-width: 800px;
    height: auto;
    border: 2px solid #248be0;
    border-radius: 10px;
    margin-top: 15px;
}

.datos-estudiante {
    margin-top: 20px;
    padding: 10px;
    border-top: 1px solid #505050;
    border-bottom: 1px solid #505050;
    display: inline-block;
}

.datos-estudiante p {
    margin: 5px 0;
    color: #e0e0e0;
}

.contenedor-principal {
    width: 90%;
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid #505050;
    background-color: #2b2b2b;
    padding: 40px;
    box-shadow: 0 0 15px rgba(0,0,0,0.5);
    border-radius: 8px;
}

.grupo-input {
    margin-bottom: 20px;
    text-align: left;
}

.grupo-input label {
    display: block;
    margin-bottom: 8px;
    color: #7ce011;
    font-weight: bold;
}

.input-uce {
    width: 100%;
    padding: 12px;
    background-color: #e0e0e0;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    color: #000;
    box-sizing: border-box;
}

.input-uce:focus {
    outline: 2px solid #248be0;
    background-color: #fff;
}

.opciones-radio, .opciones-check {
    background-color: #383838;
    padding: 15px;
    border-radius: 4px;
}

.botones-container {
    margin-top: 30px;
    text-align: center;
}

.btn-operacion {
    background-color: #248be0;
    color: white;
    padding: 15px 30px;
    cursor: pointer;
    border: none;
    font-weight: bold;
    font-size: 16px;
    border-radius: 5px;
    transition: 0.3s;
    width: 100%;
    margin-bottom: 10px;
}

.btn-operacion:hover { background-color: #1a6cb3; }

.btn-limpiar {
    background-color: #505050;
    color: white;
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    width: 50%;
}

.btn-limpiar:hover { background-color: #d9534f; }

.resultado-container {
    margin-top: 30px;
    padding: 20px;
    border: 2px dashed #7ce011;
    background-color: #000;
    text-align: center;
}

.valor-resultado {
    color: white;
    font-size: 1.1em;
    line-height: 1.6;
}

.footer-home {
    text-align: center;
    margin-top: 60px;
    margin-bottom: 40px;
}