/* ============================================
   Effects: Animations, WebGL Canvas & Back-to-Top
   ============================================ */

/* --- WebGL Background Canvas --- */
#webgl-water-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
}

/* --- Keyframes --- */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* --- Back To Top Button --- */
#back-to-top {
    position: fixed;
    bottom: 40px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--element-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 1000;

    /* Hidden state */
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: calc(var(--shadow-offset) + 2px) calc(var(--shadow-offset) + 2px) 0 var(--border-color);
}