body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f2f5;
    margin: 0;
    color: #333;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
}

h1 {
    color: #2c3e50;
    font-size: 2em;
    font-weight: 2000;
    font-style: normal;
    margin: 0px;
}

h2 {
    color: #2c3e50;
    font-size: 1.3em;
    font-weight: 500;
    font-style: italic;
    margin: 0px;
}

.title {
    margin-top: 30px;
    margin-bottom: 40px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.product {
    background-color: #fff;
    padding: 15px;
    margin: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 450px;
}

label {
    font-weight: bold;
    color: #555;
    text-align: left;
}

select {
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1em;
    width: 100%;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

select:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.damping-buttons {
    margin-top: 10px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.damping-btn {
    background-color: #e9ecef;
    color: #495057;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid #ced4da;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s ease;
}

.wide-button {
    grid-column: 1 / 3;
}

.damping-btn:hover {
    background-color: #dee2e6;
}

.damping-btn.active {
    background-color: #007bff;
    color: white;
    border-color: #007bff;
    box-shadow: 0 2px 5px rgba(0, 123, 255, 0.25);
}

#play-pause-btn {
    background-color: #28a745;
    color: white;
    cursor: pointer;
    border: none;
    font-weight: bold;
    margin-top: 10px;
    padding: 12px 15px;
    border-radius: 8px;
    width: 100%;
    font-size: 1em;
    transition: all 0.3s ease;
}

#play-pause-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

audio {
    display: none;
}

.info {
    margin-top: 20px;
    color: #777;
    font-size: 0.9em;
}