body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

h1, h2, h3 {
    color: #1a202c;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

input[type="url"],
input[type="password"],
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #007bff;
}

textarea {
    resize: vertical;
    font-family: "Courier New", Courier, monospace;
}

.hint {
    font-size: 0.9em;
    color: #555;
    margin-top: -5px;
    margin-bottom: 10px;
}

button {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #a0c7e4;
    cursor: not-allowed;
}

.response-box, .error-box {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    padding: 15px;
    margin-top: 10px;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: "Courier New", Courier, monospace;
}

.error-box {
    color: #d9534f;
    background-color: #f2dede;
    border-color: #ebccd1;
}

.warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.loader {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 30px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}