/* wwwroot/css/site.css */
body {
    background-color: #eef2f3;
    font-family: 'Segoe UI', sans-serif;
}

.container-center {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh; /* Căn giữa màn hình */
}

.card {
    background: white;
    width: 400px;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
}

.image-area img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid #eee;
}

.word {
    font-size: 2.5rem;
    color: #333;
    margin: 20px 0;
    font-weight: 700;
}

.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s;
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
}

    .btn:active {
        transform: scale(0.95);
    }

.btn-audio {
    background-color: #3498db;
}

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

.btn-next {
    background-color: #2ecc71;
}

    .btn-next:hover {
        background-color: #27ae60;
    }

.btn-disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

.alert-box {
    color: #c0392b;
    background: #fadbd8;
    padding: 15px;
    border-radius: 8px;
}