.tuvi-container {
    max-width: 600px;
    width: 100%;
    margin: 20px auto;
    text-align: center;
    padding: 20px;
    box-sizing: border-box;
    border: 1px solid #ddd;
    border-radius: 12px;
    background: #fff url('https://sntgroup.net/wp-content/uploads/2025/07/pngtree-chinese-style-ink-bamboo-psd-layered-main-picture-background-material-image_165111.jpg') center center no-repeat;
    background-size: cover;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.tuvi-container h2 {
    color: #c40000;
    font-weight: bold;
    font-size: 24px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.tuvi-container input[type="text"] {
    width: 100%;
    max-width: 400px;
    padding: 10px 15px;
    margin: 12px 0;
    border: 2px solid #ccc;
    border-radius: 30px;
    box-sizing: border-box;
    font-size: 16px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    background: #fff;
}

.tuvi-container input[type="text"]:focus {
    border-color: #007bff;
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
    outline: none;
    transform: scale(1.02);
}

.tuvi-container button {
    padding: 12px 20px;
    background: linear-gradient(to bottom, #ff0000, #cc0000);
    border: 2px solid gold;
    color: white;
    border-radius: 50px;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
}

.tuvi-container button:hover {
    background: linear-gradient(to bottom, #cc0000, #990000);
    box-shadow: 0 7px 20px rgba(0,0,0,0.5);
    transform: scale(1.05);
}

.tuvi-result {
    margin-top: 20px;
    text-align: left;
    word-wrap: break-word;
    border: 2px solid #007bff;
    padding: 15px;
    border-radius: 10px;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    position: relative;
}

.tuvi-result:before {
    content: "";
    position: absolute;
    top: -6px;
    left: -6px;
    right: -6px;
    bottom: -6px;
    border: 1px dashed #5bc0de;
    border-radius: 12px;
    pointer-events: none;
}

.tuvi-result .logo-amduong {
    width: 20px;
    display: block;
    margin: 0 auto 10px;
    opacity: 0.7;
}

.tuvi-result .cay-nen {
    width: 15px;
    display: block;
    margin: 15px auto 0;
    opacity: 0.7;
}

.tuvi-note {
    color: green;
    font-style: italic;
    font-size: 13px;
    margin-top: 10px;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .tuvi-container {
        max-width: 95%;
        padding: 15px;
        background-size: contain;
    }

    .tuvi-container h2 {
        font-size: 20px;
    }

    .tuvi-container input[type="text"] {
        max-width: 100%;
        font-size: 16px;
    }

    .tuvi-container button {
        font-size: 16px;
        padding: 10px 16px;
    }

    .tuvi-result {
        font-size: 14px;
    }

    .tuvi-result .logo-amduong {
        width: 14px;
    }

    .tuvi-result .cay-nen {
        width: 12px;
    }
}