.tgwv-fixed-contact {
    --tgwv-fixed-accent: #e5372b;
    --tgwv-fixed-btn-size: 48px;
    --tgwv-fixed-icon-size: 28px;

    position: fixed;
    right: 0;
    bottom: 16px;
    z-index: 9990;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
}

.tgwv-fixed-contact__btn {
    box-sizing: border-box;
    display: grid;
    grid-template-columns: var(--tgwv-fixed-btn-size) 0fr;
    align-items: center;
    width: var(--tgwv-fixed-btn-size);
    height: var(--tgwv-fixed-btn-size);
    min-height: var(--tgwv-fixed-btn-size);
    padding: 0;
    border: none;
    border-radius: 999px 0 0 999px;
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.01em;
    text-decoration: none;
    box-shadow: -2px 4px 14px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    overflow: hidden;
    white-space: nowrap;
    transition:
        width 0.45s cubic-bezier(0.22, 1, 0.36, 1),
        grid-template-columns 0.45s cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 0.35s ease,
        background-color 0.35s ease;
}

.tgwv-fixed-contact__btn:focus-visible {
    color: #fff;
    text-decoration: none;
}

.tgwv-fixed-contact__btn--phone {
    background: var(--bs-success, #198754);
}

.tgwv-fixed-contact__btn--messenger {
    background: var(--tgwv-fixed-accent);
}

.tgwv-fixed-contact__btn--zalo {
    background: #fff;
    box-shadow: -2px 4px 14px rgba(0, 0, 0, 0.12);
}

.tgwv-fixed-contact__btn--top {
    background: var(--tgwv-fixed-accent);
}

.tgwv-fixed-contact__icon {
    display: inline-flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    width: var(--tgwv-fixed-btn-size);
    height: var(--tgwv-fixed-btn-size);
    font-size: 18px;
}

.tgwv-fixed-contact__btn-img {
    display: block;
    width: var(--tgwv-fixed-icon-size);
    height: var(--tgwv-fixed-icon-size);
    object-fit: contain;
}

.tgwv-fixed-contact__label {
    display: block;
    min-width: 0;
    overflow: hidden;
    opacity: 0;
    padding-right: 0;
    transform: translateX(8px);
    transition:
        opacity 0.3s ease,
        transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
        padding 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.tgwv-fixed-contact__btn--zalo .tgwv-fixed-contact__label {
    color: #0068ff;
    font-weight: 700;
}

/* Mobile & iPad (< 992px): chỉ icon, click mở link trực tiếp */
@media (max-width: 991.98px) {
    .tgwv-fixed-contact__btn:hover,
    .tgwv-fixed-contact__btn:focus-visible,
    .tgwv-fixed-contact__btn:active,
    .tgwv-fixed-contact__btn.is-expanded {
        width: var(--tgwv-fixed-btn-size);
        grid-template-columns: var(--tgwv-fixed-btn-size) 0fr;
        box-shadow: -2px 4px 14px rgba(0, 0, 0, 0.2);
    }

    .tgwv-fixed-contact__btn--zalo:hover,
    .tgwv-fixed-contact__btn--zalo:focus-visible,
    .tgwv-fixed-contact__btn--zalo:active,
    .tgwv-fixed-contact__btn--zalo.is-expanded {
        box-shadow: -2px 4px 14px rgba(0, 0, 0, 0.12);
    }

    .tgwv-fixed-contact__btn:hover .tgwv-fixed-contact__label,
    .tgwv-fixed-contact__btn:focus-visible .tgwv-fixed-contact__label,
    .tgwv-fixed-contact__btn:active .tgwv-fixed-contact__label,
    .tgwv-fixed-contact__btn.is-expanded .tgwv-fixed-contact__label {
        opacity: 0;
        padding-right: 0;
        padding-left: 0;
        transform: translateX(8px);
    }
}

@media (min-width: 992px) {
    .tgwv-fixed-contact__btn:hover,
    .tgwv-fixed-contact__btn:focus-visible,
    .tgwv-fixed-contact__btn.is-expanded {
        width: auto;
        max-width: 320px;
        grid-template-columns: var(--tgwv-fixed-btn-size) 1fr;
        box-shadow: -4px 6px 20px rgba(0, 0, 0, 0.24);
    }

    .tgwv-fixed-contact__btn--zalo:hover,
    .tgwv-fixed-contact__btn--zalo:focus-visible,
    .tgwv-fixed-contact__btn--zalo.is-expanded {
        box-shadow: -2px 4px 14px rgba(0, 0, 0, 0.14);
    }

    .tgwv-fixed-contact__btn:hover .tgwv-fixed-contact__label,
    .tgwv-fixed-contact__btn:focus-visible .tgwv-fixed-contact__label,
    .tgwv-fixed-contact__btn.is-expanded .tgwv-fixed-contact__label {
        opacity: 1;
        padding-right: 16px;
        padding-left: 4px;
        transform: translateX(0);
        transition-delay: 0.06s;
    }

    .tgwv-fixed-contact__btn:not(:hover):not(:focus-visible):not(.is-expanded) .tgwv-fixed-contact__label {
        transition-delay: 0s;
    }
}

@media (prefers-reduced-motion: reduce) {
    .tgwv-fixed-contact__btn,
    .tgwv-fixed-contact__label {
        transition-duration: 0.01ms;
    }
}