body {
    font-family: 'Noto Sans Khmer', Arial, sans-serif;
    background: #f7f7f7;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 480px;
    margin: 30px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 24px 16px 32px 16px;
}
h1 {
    text-align: center;
    color: #333;
}
#voiceBtn {
    display: block;
    margin: 24px auto 10px auto;
    padding: 14px 32px;
    font-size: 1.3em;
    border: none;
    border-radius: 8px;
    background: #4caf50;
    color: white;
    cursor: pointer;
    transition: background 0.2s;
}
#voiceBtn:active {
    background: #388e3c;
}
.transcript {
    min-height: 28px;
    text-align: center;
    color: #555;
    margin-bottom: 14px;
}
.cart {
    margin-top: 20px;
    background: #f1f8e9;
    border-radius: 8px;
    padding: 10px 14px;
    min-height: 48px;
}
.error {
    color: #e53935;
    text-align: center;
    margin-top: 12px;
}
@media (max-width: 600px) {
    .container {
        max-width: 98vw;
        padding: 12px 2vw 18px 2vw;
    }
    #voiceBtn {
        width: 100%;
        font-size: 1.1em;
        padding: 12px 0;
    }
}