.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media(min-width:768px) {
    .cert-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media(min-width:1024px) {
    .cert-grid {
        grid-template-columns: repeat(6, 1fr);
        gap: 1.5rem;
    }
}

.cert-card {
    position: relative;
    background: var(--card);
    border: 2px solid rgba(212, 160, 23, .3);
    border-radius: var(--radius);
    padding: 1.5rem 1rem 1.25rem;
    text-align: center;
    transition: all .3s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .75rem;
}

.cert-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(212, 160, 23, .4);
    transform: translateY(-2px);
}

/* ── Badge ─────────────────────────────────────────────────────── */
.cert-badge {
    position: absolute;
    top: -.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--accent-foreground);
    font-size: .7rem;
    font-weight: 700;
    padding: .2rem .65rem;
    border-radius: 1rem;
    white-space: nowrap;
    letter-spacing: .03em;
}

/* ── Logo box (thay thế cert-icon) ─────────────────────────────── */
.cert-logo-box {
    width: 100%;
    aspect-ratio: 3 / 2;
    /* hình chữ nhật ngang, tỉ lệ 3:2 */
    background: #ffffff;
    border: 1px solid rgba(212, 160, 23, .2);
    border-radius: calc(var(--radius) - 2px);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: border-color .3s;
    padding: .5rem;
}

.cert-card:hover .cert-logo-box {
    border-color: rgba(212, 160, 23, .55);
}

.cert-logo-box img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
}

/* Fallback khi chưa có logo */
.cert-logo-fallback {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: .05em;
    opacity: .7;
}

/* ── Tên thương hiệu ────────────────────────────────────────────── */
.cert-name {
    font-weight: 600;
    font-size: .9rem;
    color: var(--foreground);
    margin: 0;
    line-height: 1.3;
}

/* ── CERT IMAGE SLIDER ─────────────────────────────────────────── */
.cert-slider-wrap {
    position: relative;
    max-width: 680px;
    margin: 2.5rem auto 0;
}

.cert-slider-viewport {
    border-radius: var(--radius);
    border: 1px solid rgba(212, 160, 23, .25);
    overflow: hidden;
}

.cert-slider {
    position: relative;
}

.cert-slide {
    display: none;
}

.cert-slide.active {
    display: block;
}

.cert-slide img {
    max-width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
}

.cert-slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, .55);
    border: 1px solid rgba(212, 160, 23, .4);
    color: var(--accent);
    font-size: 2rem;
    line-height: 1;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .2s;
    z-index: 2;
    padding: 0;
}

.cert-slider-btn:hover {
    background: rgba(212, 160, 23, .2);
}

.cert-slider-prev {
    left: -.75rem;
}

.cert-slider-next {
    right: -.75rem;
}

.cert-slider-dots {
    display: flex;
    justify-content: center;
    gap: .5rem;
    margin-top: .75rem;
}

.cert-dot {
    width: .5rem;
    height: .5rem;
    border-radius: 50%;
    background: var(--border);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background .2s, transform .2s;
}

.cert-dot.active {
    background: var(--accent);
    transform: scale(1.3);
}