html, body {
    margin: 0;
    padding: 0;
    background-color: white;
    overflow: hidden;
}

.back-to-portfolio{
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 20;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.12);
    color: #0f172a;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 160ms ease, box-shadow 160ms ease;
}

.back-to-portfolio:hover,
.back-to-portfolio:focus-visible{
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.2);
}