/* --- Scroll to Top Button Style (V8.3) --- */
.scroll-btn {
    position: fixed !important;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: rgba(4, 6, 18, 0.95);
    border: 1px solid var(--accent-neon);
    border-radius: 50%;
    color: var(--accent-neon);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 9999;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(30px) scale(0.8);
    backdrop-filter: blur(15px);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
}

.scroll-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-btn:hover {
    background: var(--accent-neon);
    color: #000;
    box-shadow: 0 0 35px var(--accent-neon);
    transform: scale(1.1) rotate(-8deg);
}

.scroll-btn svg {
    transition: transform 0.3s ease;
}

.scroll-btn:hover svg {
    transform: translateY(-2px);
}