/* ===== SCROLL UP BUTTON ===== */
.scroll-up-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    z-index: 999;
    border: 2px solid var(--white);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
}

.scroll-up-button.show {
    opacity: 1;
    visibility: visible;
}

.scroll-up-button:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
}

.scroll-up-button i {
    font-size: 1.5rem;
}

.scroll-up-button .tooltip {
    position: absolute;
    top: 50%;
    right: 70px;
    transform: translateY(-50%);
    background: var(--dark-blue);
    color: var(--white);
    padding: 8px 15px;
    border-radius: 5px;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.scroll-up-button .tooltip:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 100%;
    transform: translateY(-50%);
    border-width: 6px;
    border-style: solid;
    border-color: transparent transparent transparent var(--dark-blue);
}

.scroll-up-button:hover .tooltip {
    opacity: 1;
    right: 75px;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .scroll-up-button {
        width: 50px;
        height: 50px;
        bottom: 15px;
        right: 15px;
    }
    
    .scroll-up-button i {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .scroll-up-button {
        width: 45px;
        height: 45px;
        bottom: 10px;
        right: 10px;
    }
    
    .scroll-up-button i {
        font-size: 1.2rem;
    }
    
    .scroll-up-button .tooltip {
        display: none;
    }
}