body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    background: linear-gradient(to right, #4A90E2, #50C9C3);
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 20px;
}

.tutorial {
    background-color: #e0f7fa;
    border: 1px solid #4A90E2;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 20px;
    text-align: center;
}

.area-topic-selection {
    margin-bottom: 20px;
}

.bibliografia-select, .topic-select, .questions-number, #username {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.timer, .question, .remaining-questions {
    text-align: center;
    font-size: 1.2em;
    margin: 10px 0;
}

.choices {
    list-style-type: none;
    padding: 0;
}

.choices li {
    margin: 10px 0;
}

button {
    display: block;
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: none;
    border-radius: 5px;
    background: linear-gradient(to right, #4A90E2, #50C9C3);
    color: white;
    font-size: 1em;
    cursor: pointer;
}

button:hover {
    opacity: 0.9;
}

.correct-answer {
    color: green;
}

.incorrect-answer {
    color: red;
}

#ranking {
    margin-top: 20px;
}

#ranking h2 {
    text-align: center;
    margin-bottom: 20px;
}

#ranking table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

#ranking table, #ranking th, #ranking td {
    border: 1px solid #ddd;
    padding: 10px;
}

#ranking th {
    background-color: #f2f2f2;
    text-align: left;
}

#ranking td {
    text-align: left;
}

#anuncios {
    margin-top: 20px;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
    background-color: #f9f9f9;
}

.categoria {
    font-weight: bold;
}

.categoria-pronto {
    color: orange;
}

.categoria-novedades {
    color: green;
}

.categoria-lanzamiento {
    color: blue;
}

.categoria-actualizacion {
    color: purple;
}

#coming-soon {
    margin-top: 20px;
    padding: 10px;
    background-color: #e0f7fa;
    border: 1px solid #4A90E2;
    border-radius: 5px;
    text-align: center;
    font-weight: bold;
}

.highlight {
    background: linear-gradient(to right, #FF5722, #FFC107);
    color: white;
}

.share-button.whatsapp-button {
    background: linear-gradient(to right, #25D366, #56C864);
}

.share-button.telegram-button {
    background: linear-gradient(to right, #0088cc, #4FC3F7);
}

.share-button.facebook-button {
    background: linear-gradient(to right, #3b5998, #8b9dc3);
}
@keyframes blink {
    50% {
        opacity: 0.5;
    }
}

.blink {
    animation: blink 1s infinite;
}
.option-available {
    background-color: #d4edda; /* Verde claro */
    color: #155724; /* Verde oscuro */
}