.scroll-top-wrap {
    position: fixed;
    right: 25px;
    bottom: 25px;
    width: 64px;
    height: 64px;
    cursor: pointer;
    z-index: 9999;
    border-radius: 50%;
    background: #ffffff;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* ─── پروگرس ─── */
.progress-circle {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
    z-index: 4;
    pointer-events: none;
}

.progress-circle circle {
    fill: none;
    stroke: #002240;
    stroke-width: 9;
    stroke-linecap: round;
    stroke-dasharray: 195;
    stroke-dashoffset: 195;
}

/* ─── آب ─── */
.water {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: #7dd3fc;
    z-index: 1;
    transition: height 0.25s ease;
    overflow: visible;
}

/* ─── موج ─── */
.wave-track {
    position: absolute;
    top: -19px;
    left: 0;
    display: flex;
    flex-direction: row;
    animation: anchorWaveScroll 2s linear infinite;
    will-change: transform;
    visibility: hidden;
}

.wave-tile {
    flex-shrink: 0;
    display: block;
}

@keyframes anchorWaveScroll {
    from { transform: translateX(0); }
    to   { transform: translateX(-60px); }
}

/* ─── زنجیر ─── */
.chain-svg {
    position: absolute;
    top: 3px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.3));
    animation: anchorChainSway 3s ease-in-out infinite;
}

@keyframes anchorChainSway {
    0%,  100% { transform: translateX(-50%) rotate(0deg); }
    35%       { transform: translateX(-50%) rotate(3deg); }
    65%       { transform: translateX(-50%) rotate(-3deg); }
}

/* ─── لنگر ─── */
.anchor-icon {
    position: absolute;
    top: 23px;
    left: 50%;
    transform: translateX(-70%);
    font-size: 26px;
    filter: sepia(1) saturate(3) hue-rotate(180deg) brightness(0.4);
    z-index: 3;
    animation: anchorFloatIdle 3s ease-in-out infinite;
}

@keyframes anchorFloatIdle {
    0%,  100% { transform: translate(-50%, 0px); }
    50%       { transform: translate(-50%, 2px); }
}

.scroll-top-wrap:hover .anchor-icon {
    animation: anchorSwing 0.6s ease forwards;
}

@keyframes anchorSwing {
    0%   { transform: translate(-50%, 0) rotate(0deg); }
    25%  { transform: translate(-50%, 0) rotate(-12deg); }
    50%  { transform: translate(-50%, 0) rotate(9deg); }
    75%  { transform: translate(-50%, 0) rotate(-5deg); }
    100% { transform: translate(-50%, 0) rotate(0deg); }
}