body {
    font-family: Arial, sans-serif;
    background: #181818;
    color: #fff;
    margin: 0;
    padding: 0;
}

header {
    background: #222;
    padding: 16px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2em;
}

nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
}

main {
    max-width: 600px;
    margin: 40px auto;
    background: #232323;
    border-radius: 12px;
    padding: 24px;
}

.track-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.note {
    color: #aaa;
    font-size: 0.95em;
}

.lock-panel {
    margin-top: 16px;
}

.full-content {
    margin-top: 16px;
}

.hidden {
    display: none;
}

@media (max-width: 700px) {
    main {
        margin: 10px;
        padding: 10px;
    }
    .track-header img {
        width: 40px;
        height: 40px;
    }
}