.utm-container {
    max-width: 900px;
    margin: auto;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    padding: 20px;
}

.utm-title {
    color: #333;
}

.utm-tool {
    background: #f9f9f9;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid #eee;
}

.utm-form-group {
    margin-bottom: 15px;
}

.utm-label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.utm-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.utm-generate-btn {
    background-color: #007bff;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
}

.utm-result {
    margin-top: 25px;
    padding: 15px;
    border: 2px dashed #007bff;
    background: #e9f5ff;
    border-radius: 4px;
    overflow-wrap: break-word;
}

.utm-result-title {
    margin-bottom: 10px;
}

.utm-result-text {
    word-break: break-all;
}

.required::after {
    content: "*";
    color: #cc0000;
    margin-left: 5px;
}

.utm-back {
    text-align: center;
    margin-top: 20px;
}

.utm-home-btn {
    display: inline-block;
    padding: 12px 20px;
    background: #28a745;
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-size: 16px;
}

.utm-home-btn:hover {
    background: #218838;
}

.utm-copy-btn {
    background: #596067;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 10px 18px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 10px;
}

.utm-copy-btn:disabled {
    background: #aaa;
    cursor: not-allowed;
}

.utm-copy-btn:hover:enabled {
    background: #5a6268;
}

.utm-copy-msg {
    display: inline-block;
    margin-left: 10px;
    color: green;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.utm-copy-msg.show {
    opacity: 1;
}

@media (max-width: 420px) {
    .utm-container {
        padding: 10px;
    }

    .utm-tool {
        padding: 15px;
    }

    .utm-input {
        padding: 8px;
        font-size: 14px;
    }

    .utm-generate-btn,
    .utm-home-btn,
    .utm-copy-btn {
        width: 100%;
        font-size: 14px;
        padding: 10px;
        box-sizing: border-box;
    }
}