body {
    margin: 0;
    display: flex;
    height: 100vh;
    background: radial-gradient(ellipse at center, #0a0f1c 0%, #000000 100%);
    font-family: 'Orbitron', sans-serif;
    color: #00ffff;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: rgba(0, 255, 255, 0.05);
    border-right: 1px solid #00ffff;
    padding: 30px 20px;
    box-shadow: 2px 0 10px rgba(0, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-shadow: 0 0 10px #00ffff;
    text-align: center;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar ul li a {
    display: block;
    font-size: 1.4rem;
    padding: 18px;
    border: 2px solid #00ffff;
    border-radius: 14px;
    text-decoration: none;
    color: #00ffff;
    text-align: center;
    transition: 0.2s;
    user-select: none;
}

.sidebar ul li a.active,
.sidebar ul li a:hover {
    background-color: rgba(0, 255, 255, 0.1);
    color: #ffffff;
    text-shadow: 0 0 8px #00ffff;
}

/* Hauptbereich */
.main {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
}

.header {
    font-size: 2rem;
    margin-bottom: 30px;
    text-shadow: 0 0 15px #00ffff;
}

/* Button Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 20px;
}

.tile {
    background: rgba(0, 255, 255, 0.05);
    border: 1px solid #00ffff;
    border-radius: 15px;
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
    padding: 20px;
    text-align: center;
    transition: 0.3s ease-in-out;
}

.tile button {
    background: none;
    border: none;
    color: #00ffff;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
}

.tile button:hover {
    color: white;
    text-shadow: 0 0 10px #00ffff;
    transform: scale(1.05);
}

.tile img {
    width: 70px;
    height: 70px;
    object-fit: contain;
}