* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(130deg, #07080a, #111214);
}

.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-3px);
}

.scroll-to-top svg {
    width: 24px;
    height: 24px;
    color: rgba(255, 255, 255, 0.7);
}

@media (max-width: 768px) {
    .scroll-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }

    .scroll-to-top svg {
        width: 20px;
        height: 20px;
    }
}