/* ── WhatsApp floating button (system-wide) ── */
.edu-whatsapp-fab,
.edu-research-whatsapp-fab {
    position: fixed;
    z-index: 97;
    inset-inline-end: max(18px, env(safe-area-inset-right, 0px) + 10px);
    bottom: max(20px, env(safe-area-inset-bottom, 0px) + 12px);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 56px;
    padding: 0 18px 0 14px;
    border-radius: 999px;
    background: #25d366;
    color: #fff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 800;
    line-height: 1;
    box-shadow: 0 10px 28px rgba(37, 211, 102, 0.42);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    isolation: isolate;
}

.edu-whatsapp-fab i,
.edu-research-whatsapp-fab i {
    font-size: 28px;
    line-height: 1;
}

.edu-whatsapp-fab:hover,
.edu-research-whatsapp-fab:hover {
    color: #fff;
    background: #1ebe57;
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(37, 211, 102, 0.5);
}

.edu-whatsapp-fab:focus-visible,
.edu-research-whatsapp-fab:focus-visible {
    outline: 3px solid rgba(37, 211, 102, 0.45);
    outline-offset: 3px;
}

.edu-whatsapp-fab::before,
.edu-research-whatsapp-fab::before {
    content: "";
    position: absolute;
    inset: -4px;
    border-radius: inherit;
    border: 2px solid rgba(37, 211, 102, 0.35);
    animation: edu-whatsapp-fab-pulse 2.4s ease-out infinite;
    pointer-events: none;
}

@keyframes edu-whatsapp-fab-pulse {
    0% {
        transform: scale(1);
        opacity: 0.75;
    }
    70% {
        transform: scale(1.12);
        opacity: 0;
    }
    100% {
        transform: scale(1.12);
        opacity: 0;
    }
}

@media (max-width: 768px) {
    .edu-whatsapp-fab,
    .edu-research-whatsapp-fab {
        min-height: 52px;
        padding: 0 14px;
        gap: 0;
    }

    .edu-whatsapp-fab__text,
    .edu-research-whatsapp-fab__text {
        display: none;
    }

    .edu-whatsapp-fab i,
    .edu-research-whatsapp-fab i {
        font-size: 26px;
    }
}

.portal-bottom-nav--access-app ~ .edu-whatsapp-fab,
.edu-access-app .edu-whatsapp-fab,
.edu-access-app .edu-research-whatsapp-fab {
    bottom: max(78px, env(safe-area-inset-bottom, 0px) + 68px);
}

[data-theme="dark"] .edu-whatsapp-fab,
[data-theme="dark"] .edu-research-whatsapp-fab {
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
}