body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f0f2f5;
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 15px;
}

.ivr-container {
    background: #fff;
    width: 100%;
    max-width: 420px;
    padding: 20px;
    border-radius: 14px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    text-align: center;
}

h1 { font-size: 22px; margin-top: 0; }
h2 { font-size: 18px; margin-bottom: 10px; }

button {
    width: 100%;
    margin: 10px 0;
    padding: 16px;
    font-size: 18px;
    border-radius: 12px;
    border: none;
    background: #4CAF50;
    color: #fff;
    cursor: pointer;
    touch-action: manipulation;
}

button:active {
    transform: scale(0.98);
    background: #43a047;
}