.top-nav {
    position: fixed;
    top: 2rem;
    left: 2rem;
    right: 2rem;
    z-index: 1001;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.back-button {
    padding: 0.6rem 1.2rem ;
    background: rgba(0, 0, 0, 0.15) ;
    border: 2px solid rgba(255, 255, 255, 0.5) ;
    color: white ;
    text-decoration: none ;
    border-radius: 10px ;
    font-size: 11.7px ;
    font-weight: bold ;
    backdrop-filter: blur(10px) ;
    box-shadow: 0 5px 15px rgba(229, 84, 59, 0.6) ;
    transition: all 0.3s ease ;
    text-shadow: 2px 2px 4px rgba(229, 84, 59, 0.8) ;
}

.back-button:hover {
    transform: translateY(-2px) scale(1.05);
    background: rgba(0, 0, 0, 0.25);
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    padding: 0.3rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 15px rgba(229, 84, 59, 0.6);
}

.top-nav .toggle-btn {
    padding: 0.6rem 1.2rem ;
    background: transparent ;
    border: none ;
    color: rgba(255, 255, 255, 0.6) ;
    border-radius: 8px ;
    cursor: pointer ;
    transition: all 0.3s ease ;
    font-size: 11.7px ;
    font-weight: bold ;
    text-shadow: 2px 2px 4px rgba(229, 84, 59, 0.8) ;
    -webkit-tap-highlight-color: transparent ;
}

.top-nav .toggle-btn.active {
    background: rgba(255, 255, 255, 0.2) ;
    color: white ;
}

.top-nav .toggle-btn:hover {
    color: white ;
}

@media (max-width: 768px) {
    .top-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        max-width: 120px;
    }

    .mode-toggle {
        flex-direction: column;
    }
}