.home-button {
    width: 60px;
    height: 60px;
    background: linear-gradient(145deg, #e6e6e6, #ffffff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid #d1d1d1;
    box-shadow: 4px 4px 10px #d1d1d1, -4px -4px 10px #ffffff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1000;
}

.home-button:hover {
    background: linear-gradient(145deg, #ffffff, #e6e6e6);
    box-shadow: 2px 2px 5px #d1d1d1, -2px -2px 5px #ffffff;
    transform: scale(1.05);
}

.home-button svg {
    width: 32px;
    height: 32px;
    stroke: #111827;
    stroke-width: 2.5;
    fill: none;
    transition: stroke 0.3s ease;
}

.home-button:hover svg {
    stroke: #000000;
}

.back-btn-container {
    position: fixed;
    top: 25px;
    left: 25px;
    z-index: 1000;
}

.back-btn-container a {
    text-decoration: none;
}

/* Specific rule for circular buttons to avoid !important */
button#music-toggle-btn.home-button {
    border-radius: 50%;
}

/* Vertical layout for Hausaufgaben and Testplaner (Left side) */
.vertical-nav-container {
    position: fixed;
    top: 25px;
    left: 25px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 1100;
}

/* Right side container for other pages (Home + Music cluster) */
.right-nav-container {
    position: fixed;
    top: 25px;
    right: 25px;
    display: flex;
    flex-direction: column; /* Stacked on right too for consistency */
    gap: 15px;
    z-index: 1100;
}