body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    max-width: 400px;
    width: 100%;
    background: #ffffff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

h2 { color: #1a73e8; text-align: center; margin-bottom: 5px; }
p { text-align: center; color: #555; font-size: 14px; margin-bottom: 20px; }

.form-group { margin-bottom: 15px; }
label { display: block; font-weight: 600; margin-bottom: 5px; color: #333; }

input[type="text"], select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
}

.payment-box {
    background: #f9f9f9;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 6px;
}

.payment-option {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-size: 14px;
    cursor: pointer;
}

button {
    width: 100%;
    background-color: #25D366;
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #1ebe57;
}