* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: #f9f9f9;
    margin: 0;
    padding: 20px;
}

.join-form {
    max-width: 600px;
    margin: 20px auto; /* top-bottom margin, centered horizontally */
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.join-form h2 {
    margin-bottom: 20px;
    font-size: 24px;
    color: #333;
    text-align: center;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.form-group textarea {
    height: 100px;
    resize: vertical;
}

.submit-btn {
    background: #5a7e70;
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    width: 100%;
    transition: background 0.3s;
}

.submit-btn:hover {
    background: #0056b3;
}

@media (max-width: 500px) {
    .join-form {
        padding: 20px;
    }
}