.registration-form {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px;
    background-color: var(--secondary-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.4);
}

.registration-form h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--secondary-text-color);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background-color: var(--primary-bg);
    color: var(--text-color);
    border-radius: 10px;
    font-size: 1rem;
}

.form-group button {
    width: 100%;
    padding: 15px;
    border: none;
    background-color: var(--accent-color);
    color: var(--primary-bg);
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.form-group button:hover {
    background-color: #ffd700a6;
}

.instrument-selection {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px;
    background-color: var(--secondary-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.4);
}

.instrument-selection h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
    font-weight: 600;
}

.instrument-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.instrument-tile {
    background-color: var(--primary-bg);
    border-radius: 20px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
}

.instrument-tile:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px 0 rgba(0, 0, 0, 0.3);
}

.instrument-tile.selected {
    border-color: var(--accent-color);
    box-shadow: 0 0 20px 0 rgba(255, 215, 0, 0.5);
}

.instrument-tile img {
    max-width: 100%;
    height: auto;
    margin-bottom: 20px;
}

.instrument-tile h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}