/* ========== SCROLL TO TOP BUTTON ========== */
.gogi-scroll-bill {
    position: fixed;
    bottom: 50px;
    right: 50px;
    width: 60px;
    height: 60px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color, #00b400), var(--primary-light, #00dd76));
    color: white;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 
        0 10px 30px rgba(0, 180, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    overflow: hidden;
}

.gogi-scroll-bill::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.gogi-scroll-bill:hover::before {
    transform: translateX(100%);
}

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

.gogi-scroll-bill:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 
        0 15px 40px rgba(0, 180, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* Arrow Icon */
.gogi-arrow-bill {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    transition: transform 0.3s ease;
}

.gogi-scroll-bill:hover .gogi-arrow-bill {
    transform: translateY(-2px);
}

.gogi-arrow-bill i {
    font-size: 1.4rem;
    font-weight: 900;
    transition: transform 0.3s ease;
}

.gogi-scroll-bill:hover .gogi-arrow-bill i {
    transform: scale(1.1);
}

/* Pulse Effect */
.gogi-pulse-bill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color, #00b400), var(--primary-light, #00dd76));
    opacity: 0;
    animation: gogi-pulse-bill 2s ease-in-out infinite;
    z-index: 1;
}

@keyframes gogi-pulse-bill {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }
    70% {
        transform: scale(1.3);
        opacity: 0;
    }
    100% {
        transform: scale(1.3);
        opacity: 0;
    }
}

/* Click Animation */
.gogi-scroll-bill.clicked-bill {
    animation: gogi-click-bill 0.6s ease;
}

@keyframes gogi-click-bill {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

/* Scroll Progress Indicator (Optional) */
.gogi-progress-bill {
    position: fixed;
    bottom: 100px;
    right: 45px;
    width: 4px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    z-index: 999;
}

.gogi-progress-bill.active-bill {
    opacity: 1;
    visibility: visible;
}

.gogi-progress-fill-bill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: linear-gradient(to top, var(--primary-color, #00b400), var(--primary-light, #00dd76));
    border-radius: 2px;
    transition: height 0.1s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .gogi-scroll-bill {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
    }
    
    .gogi-arrow-bill i {
        font-size: 1.2rem;
    }
    
    .gogi-progress-bill {
        bottom: 80px;
        right: 32px;
        height: 50px;
    }
}

@media (max-width: 480px) {
    .gogi-scroll-bill {
        bottom: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
    }
    
    .gogi-arrow-bill i {
        font-size: 1.1rem;
    }
    
    .gogi-progress-bill {
        bottom: 70px;
        right: 27px;
        height: 45px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .gogi-scroll-bill,
    .gogi-arrow-bill,
    .gogi-pulse-bill {
        transition: none;
        animation: none;
    }
    
    .gogi-scroll-bill:hover {
        transform: none;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .gogi-scroll-bill {
        box-shadow: 
            0 10px 30px rgba(0, 180, 0, 0.4),
            inset 0 1px 0 rgba(255, 255, 255, 0.1);
    }
}