body {
    text-align: center;
    background-color: #000000;
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    background: linear-gradient(-45deg, #23a6d5, #9876ff, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradientAnimation 50s ease infinite;
    color: #000000;
    min-height: 100vh;
}



@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    margin: 20px auto;
    width: 80%;
    max-width: 800px;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

button {
    padding: 10px 20px;
    font-size: 16px;
    margin: 10px 5px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

button:hover {
    background-color: #555;
    color: #fff;
}

.startButton {
    background-color: #4CAF50;
    color: white;
}

#pauseButton {
    background-color: #f44336;
    color: white;
}

#noteDisplay {
    font-size: 24px;
    margin: 20px 0;
    font-weight: bold;
}

#fretboard-container {
    position: relative;
    width: 100%;
    overflow: hidden;
}

#fretboard {
    position: relative;
    width: 100%;
    height: 200px;
    background-color: #8B4513; /* Color marrón para simular madera */
    border: 2px solid #000;
    display: grid;
    grid-template-columns: repeat(13, 1fr); /* Cambiar a 13 columnas */
    grid-template-rows: repeat(6, 1fr);
}

.string {
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: silver; /* Color blanco para las cuerdas */
    left: 0;
    z-index: 1; /* Asegurar que las cuerdas estén detrás de los botones */
}

.fret {
    border-left: 2px solid #fff; /* Color blanco para los trastes */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2; /* Asegurar que los botones estén delante de las cuerdas */
}

.fret-marker {
    width: 20px;
    height: 20px;
    background-color: #ddd;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid #555;
}

.fret-marker.correct {
    background-color: #4caf50;
    color: #8B4513;
}

.hidden-note {
    visibility: hidden;
}

#score {
    font-size: 18px;
    margin: 20px 0;
}

label {
    display: block;
    margin: 10px 0;
}

input[type="number"] {
    padding: 5px;
    font-size: 16px;
    width: 60px;
}

.fret-numbers {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    position: relative;
    width: 100%;
}

.fret-number {
    font-size: 14px;
    font-weight: bold;
    color: #000; /* Color negro para los números de los trastes */
    text-align: center;
    width: calc(100% / 13); /* Ajustar a 13 columnas */
}

.open-string-note {
    position: absolute;
    right: 30spx; /* Ajustar según sea necesario */
    font-size: 20px;
    font-weight: bold;
    color: white;
    text-shadow: 
      -1px -1px 0 #000,  
       1px -1px 0 #000,
      -1px  1px 0 #000,
       1px  1px 0 #000; /* Color blanco para las notas de cuerdas al aire */
}

#progressContainer {
    width: 100%;
    background-color: #ddd;
    margin-top: 20px;
    height: 20px;
    border-radius: 10px;
    overflow: hidden;
}

#progressBar {
    width: 0;
    height: 100%;
    background-color: #4caf50;
    transition: width 0.1s linear;
}