/* Scroll-to-top button */
.top-link {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(50, 50, 50, 0.5); /* semi-transparent */
    color: #fff;
    text-decoration: none;
    padding: 12px 16px;
    border-radius: 50%;
    font-size: 18px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: background 0.3s, transform 0.2s;
    z-index: 1000;
    text-align: center;
    line-height: 1;
    display: none; /* hidden by default */
    backdrop-filter: blur(8px); /* frosted glass effect */
    -webkit-backdrop-filter: blur(8px); /* Safari support */
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.top-link:hover {
    background: rgba(80, 80, 80, 0.6);
    transform: scale(1.1); /* small zoom effect */
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Mobile adjustments */
@media (max-width: 600px) {
    .top-link {
        bottom: 80px;
        right: 15px;
        padding: 10px 14px;
        font-size: 16px;
    }
}