body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 0;
}

header {
    background: #ff9800;
    color: white;
    padding: 20px 0;
    text-align: center;
}

.chl1 {
    background: white;
    color: black !important;
}

header .nav-wrapper {
    display: flex;
    justify-content: center;
}

header .brand-logo {
    font-size: 24px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

main {
    background: #fff;
    padding: 20px;
    margin: 20px auto;
    max-width: 900px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

#output {
    margin-top: 20px;
}

button.selected {
    background-color: #ff9800 !important;
    color: #fff !important;
}

.clef-btn,
.staff-btn,
.measure-btn {
    width: 90px;
    height: 90px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    color: black;
    border: 2px solid #ddd;
    border-radius: 5px;
    margin: 5px;
    padding: 0;
    position: relative;
    transition: background-color 0.3s, border-color 0.3s;
}

.clef-btn:hover,
.staff-btn:hover,
.measure-btn:hover {
    border-color: #aaa;
}

.clef-btn.selected,
.staff-btn.selected,
.measure-btn.selected {
    background-color: #ff9800;
    border-color: #ff9800;
    color: #fff;
}

.clef-btn svg,
.staff-btn svg,
.measure-btn svg {
    position: absolute;
    top: 5%;
    left: 5%;
    width: 90%;
    height: 90%;
}

.btn-text {
    font-size: 18px;
    font-weight: bold;
}