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

.main-container {
    background: #ffffff;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    width: 380px;
    text-align: center;
}

h2 { color: #1a73e8; margin-bottom: 5px; }
p { color: #666; font-size: 14px; margin-bottom: 25px; }

.input-section {
    margin-bottom: 25px;
}

label { display: block; margin-bottom: 8px; font-weight: bold; color: #333; }

input {
    width: 90%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 15px;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    font-weight: bold;
}

button:hover { background-color: #1557b0; }

.result-card {
    margin-top: 20px;
    padding: 20px;
    background-color: #e8f0fe;
    border-radius: 10px;
    display: none; /* JavaScript will show this */
}

#totalAmount { color: #d93025; font-size: 28px; margin: 0; }
.details { font-size: 13px; color: #555; margin-top: 10px; line-height: 1.6; }