.aboutus-presentation-cta {
    position: fixed;
    top: 92px;
    right: clamp(18px, 2.5vw, 34px);
    z-index: 38;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    margin: 0;
    padding: 0;
    color: rgba(255, 255, 255, .92);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .08em;
    text-decoration: none;
    background: rgba(16, 11, 31, .72);
    border: 1px solid rgba(167, 139, 250, .54);
    border-radius: 50%;
    box-shadow: inset 0 0 18px rgba(139, 92, 246, .12), 0 8px 28px rgba(0, 0, 0, .24);
    backdrop-filter: blur(10px);
    isolation: isolate;
    animation: aboutus-idle 3.2s ease-in-out infinite;
    transition: color .2s ease, border-color .2s ease, background-color .2s ease, box-shadow .2s ease;
}

.aboutus-presentation-cta::before,
.aboutus-presentation-cta::after {
    position: absolute;
    inset: -1px;
    z-index: -1;
    content: '';
    border: 1px solid rgba(167, 139, 250, .44);
    border-radius: 50%;
    opacity: 0;
    animation: aboutus-ripple 3.2s ease-out infinite;
}

.aboutus-presentation-cta::after {
    animation-delay: .38s;
}

.aboutus-presentation-cta span {
    position: relative;
    z-index: 1;
}

@keyframes aboutus-idle {
    0%, 100% { transform: translateY(0) scale(1); }
    38% { transform: translateY(-5px) scale(1); }
    48% { transform: translateY(-5px) scale(1.08); }
    55% { transform: translateY(-5px) scale(.98); }
    62% { transform: translateY(-5px) scale(1.055); }
    72% { transform: translateY(-3px) scale(1); }
}

@keyframes aboutus-ripple {
    0%, 43% { opacity: 0; transform: scale(.9); }
    49% { opacity: .6; }
    78%, 100% { opacity: 0; transform: scale(1.72); }
}

@media (hover: hover) {
    .aboutus-presentation-cta:hover {
        color: #fff;
        background: rgba(66, 39, 119, .82);
        border-color: rgba(196, 181, 253, .92);
        box-shadow: inset 0 0 18px rgba(167, 139, 250, .22), 0 10px 34px rgba(72, 38, 132, .36);
    }
}

.aboutus-presentation-cta:focus-visible {
    outline: 2px solid rgba(196, 181, 253, .9);
    outline-offset: 5px;
}

@media (max-width: 700px) {
    .aboutus-presentation-cta {
        top: 76px;
        right: 14px;
        width: 48px;
        height: 48px;
        font-size: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .aboutus-presentation-cta {
        animation: none;
    }

    .aboutus-presentation-cta::before,
    .aboutus-presentation-cta::after {
        animation: none;
        display: none;
    }
}