.certificates__body {
    position: relative;
}
.certificates__slider {
    overflow: hidden;
    margin: 0;
}
.certificates__card {
    position: relative;
}
.certificates__card-img {
    display: block;
    max-height: 300px;
    width: auto;
}
.certificates__card-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(30,99,119,0.85);
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}
.certificates__card-btn:hover {
    background: rgba(30,99,119,1);
}
.certificates__card-btn .plus {
    width: 20px;
    height: 20px;
}
.cert-lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}
.cert-lightbox-swiper {
    width: 90vw;
    max-width: 1200px;
    height: 90vh;
    overflow: hidden;
}
.cert-lightbox-swiper .swiper-slide {
    display: flex;
    align-items: center;
    justify-content: center;
}
.cert-lightbox-swiper .swiper-slide img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}
.cert-lightbox-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: #fff;
    font-size: 28px;
    cursor: pointer;
    z-index: 10;
}
.cert-lightbox-prev,
.cert-lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 10;
    color: #fff;
}
.cert-lightbox-prev { left: 16px; }
.cert-lightbox-next { right: 16px; }