.quality-intro {
    padding: 80px 0 60px;
    background-color: var(--bg-color);
    height: auto;
}

.quality-intro .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.quality-intro .intro-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.quality-intro .section-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    position: relative;
}

.quality-intro .section-title span {
    color: var(--primary-color);
}

.quality-intro .section-desc {
    font-size: 1.1rem;
    color: var(--text-dark-low);
    line-height: 1.7;
    margin-bottom: 3rem;
    max-width: 900px;
}

.quality-intro .intro-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
    margin-top: 2rem;
}

.quality-intro .stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    width: 250px;
    box-shadow: 0 10px 25px rgba(7, 105, 131, 0.08);
    transition: all 0.3s ease;
}

.quality-intro .stat-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(7, 105, 131, 0.15);
}

.quality-intro .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    position: relative;
}

.quality-intro .stat-number::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background-color: var(--tertiary-color);
    border-radius: 3px;
}

.quality-intro .stat-text {
    margin-top: 0.8rem;
    font-size: 1.1rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* Certificates Section */
.certificates-section {
    padding: 60px 0 100px;
    background-color: var(--bg-color);
    height: auto;
}

.certificates-section .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.certificates-section .cert-nav {
    margin-bottom: 40px;
    text-align: center;
}

.certificates-section .cert-nav h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-dark);
    font-weight: 600;
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.certificates-section .cert-nav h3::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 3px;
    background: var(--primary-color);
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 3px;
}

.certificates-section .filter-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin: 0;
    padding: 0;
}

.certificates-section .filter-tabs li {
    padding: 10px 25px;
    background-color: var(--card-bg);
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.certificates-section .filter-tabs li:hover {
    background-color: rgba(7, 105, 131, 0.08);
    color: var(--primary-color);
    transform: translateY(-3px);
}

.certificates-section .filter-tabs li.active {
    background-color: var(--primary-color);
    color: var(--text-light);
    box-shadow: 0 5px 15px rgba(7, 105, 131, 0.3);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    width: 100%;
}

.certificate-item {
    transition: all 0.3s ease;
}

.certificate-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.4s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.certificate-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(7, 105, 131, 0.15);
}

.certificate-image {
    position: relative;
    height: 350px; /* Fixed height for certificate images */
    overflow: hidden;
    cursor: pointer;
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.certificate-image img {
    
    width: calc(100% - 20px);
    height: 100%;
    object-fit: contain;
    background-color: #fff;
    transition: transform 0.4s ease;
}

.certificate-card:hover .certificate-image img {
    transform: scale(1.03);
}

.hover-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(7, 105, 131, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.certificate-card:hover .hover-overlay {
    opacity: 1;
}

.overlay-content {
    text-align: center;
    color: var(--text-light);
}

.overlay-content .view-text {
    display: block;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.overlay-content .icon {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    font-size: 1.4rem;
    transition: all 0.3s ease;
}

.certificate-card:hover .overlay-content .icon {
    background-color: rgba(255, 255, 255, 0.4);
    transform: rotate(90deg);
}

.overlay-content .icon i {
    font-size: 1.4rem;
}

.certificate-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--card-bg);
}

.certificate-info h4 {
    font-size: 1.2rem;
    margin: 0 0 8px;
    color: var(--text-dark);
    font-weight: 600;
}

.certificate-info p {
    color: var(--text-dark-low);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.certificate-meta {
    margin-top: auto;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding-top: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 0.85rem;
    color: var(--text-dark-low);
}

.certificate-meta span {
    display: flex;
    align-items: center;
}

.certificate-meta span::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
    margin-right: 8px;
}

.certification-benefit {
    padding: 80px 0;
    background-color: var(--card-bg);
    position: relative;
    height: auto;
}

.certification-benefit .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.certification-benefit .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-dark);
}

.certification-benefit .section-title span {
    color: var(--primary-color);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.benefit-item {
    background-color: var(--bg-color);
    padding: 30px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.benefit-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(7, 105, 131, 0.1);
}

.benefit-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.benefit-icon i {
    font-size: 1.8rem;
    color: var(--text-light);
}

.benefit-content h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.benefit-content p {
    color: var(--text-dark-low);
    line-height: 1.6;
}

.certificate-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    backdrop-filter: blur(5px);
    z-index: 999999999999;
}

.certificate-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    z-index: 1;
    cursor: pointer;
}

.modal-container {
    position: relative;
    z-index: 2;
    width: 90%;
    max-width: 1200px;
    max-height: 90vh;
    background-color: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: translateY(30px);
    opacity: 0;
    transition: transform 0.5s ease, opacity 0.5s ease;
}

.certificate-modal.active .modal-container {
    transform: translateY(0);
    opacity: 1;
}

.modal-content {
    display: flex;
    flex-direction: column;
    max-height: 90vh;
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-dark) 100%);
    color: var(--text-light);
    position: relative;
    overflow: hidden;
}

.modal-header::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 250px;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.08) 100%);
    pointer-events: none;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-light);
    position: relative;
    padding-left: 15px;
}

.modal-header h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 80%;
    background-color: var(--text-light);
    border-radius: 4px;
}

.close-modal {
    background: rgba(255,255,255,0.15);
    border: none;
    color: var(--text-light);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.close-modal:hover {
    transform: rotate(90deg);
    background-color: rgba(255,255,255,0.25);
}

.modal-body {
    display: flex;
    flex-wrap: wrap;
    padding: 0;
    overflow-y: auto;
    max-height: calc(90vh - 150px);
}

.certificate-viewer {
    flex: 1;
    min-width: 300px;
    padding: 30px;
    overflow: auto;
    text-align: center;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.certificate-viewer::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border: 1px dashed rgba(7, 105, 131, 0.15);
    border-radius: 10px;
    pointer-events: none;
    z-index: 0;
}

.certificate-viewer img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    border: 12px solid white;
    border-radius: 5px;
    max-height: calc(90vh - 240px);
    position: relative;
    transition: transform 0.3s ease;
    z-index: 1;
}

.certificate-viewer img:hover {
    transform: scale(1.02);
}

.certificate-details {
    width: 350px;
    padding: 30px;
    border-left: 1px solid rgba(0,0,0,0.08);
    background-color: white;
    overflow-y: auto;
}

.detail-header {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.detail-header h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin: 0 0 8px;
}

.detail-header p {
    color: var(--text-dark-low);
    margin: 0;
    font-size: 0.95rem;
}

.detail-item {
    margin-bottom: 20px;
    position: relative;
    padding-left: 30px;
}

.detail-item i {
    position: absolute;
    left: 0;
    top: 3px;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.detail-label {
    font-weight: 600;
    display: block;
    color: var(--text-dark);
    margin-bottom: 5px;
    font-size: 0.95rem;
}

.detail-value {
    color: var(--text-dark-low);
    display: block;
    line-height: 1.5;
    font-size: 0.95rem;
}

.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-color);
}

.modal-footer .cert-validation {
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-footer .cert-validation i {
    color: #28a745;
    font-size: 1.2rem;
}

.modal-footer .cert-validation span {
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--primary-color);
    padding: 12px 24px;
    border: 1px solid var(--primary-color);
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(7, 105, 131, 0.2);
}

/* Add tab navigation for the modal on smaller screens */
.modal-tabs {
    display: none;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    background-color: #f8f9fa;
}

.modal-tabs .tab {
    padding: 15px 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-dark-low);
    text-align: center;
    width: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.modal-tabs .tab.active {
    color: var(--primary-color);
}

.modal-tabs .tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

.mobile-details-tab {
    display: none;
}

/* Responsive Styles */
@media (max-width: 1200px) {
    .certificates-hero .hero-title {
        font-size: 3rem;
    }
    
    .quality-intro .section-title,
    .certification-benefit .section-title {
        font-size: 2.3rem;
    }
    
    .certificate-cta h2 {
        font-size: 2.2rem;
    }

    .certificate-viewer img {
        max-height: calc(90vh - 250px);
        border-width: 10px;
    }
}

@media (max-width: 992px) {
    .certificates-hero .hero-title {
        font-size: 2.7rem;
    }
    
    .certificates-hero .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .quality-intro .section-title,
    .certification-benefit .section-title {
        font-size: 2rem;
    }
    
    .modal-header {
        padding: 20px 25px;
    }
    
    .modal-header h3 {
        font-size: 1.4rem;
    }
    
    .modal-tabs {
        display: flex;
    }
    
    .modal-body {
        max-height: calc(90vh - 200px);
    }
    
    .certificate-viewer, .certificate-details {
        width: calc(100% - 25px);
        padding: 20px;
    }
    
    .certificate-details {
        border-left: none;
        display: none;
    }
    
    .certificate-details.mobile-details-tab {
        display: none;
    }
    
    .certificate-details.active {
        display: block;
    }
    
    .certificate-viewer {
        display: none;
    }
    
    .certificate-viewer.active {
        display: flex;
    }
    
    .detail-header {
        margin-bottom: 20px;
        padding-bottom: 10px;
    }
    
    .modal-body {
        flex-direction: column;
    }
    
    .certificate-details {
        border-left: none;
        border-top: 1px solid rgba(0,0,0,0.1);
        max-height: 30vh;
    }

    .certificate-viewer {
        min-height: 40vh;
        padding: 15px;
    }
    
    .certificate-viewer img {
        max-height: 40vh;
    }
}

@media (max-width: 768px) {
    .certificates-hero .hero-title {
        font-size: 2.3rem;
    }
    
    .certificates-hero .hero-subtitle {
        font-size: 1rem;
    }
    
    .quality-intro .section-desc,
    .certification-benefit .section-desc,
    .certificate-cta p {
        font-size: 1rem;
    }
    
    .certificates-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .certificate-image {
        height: 280px;
        padding: 10px 20px;
    }
    
    .quality-intro .intro-stats {
        gap: 15px;
    }
    
    .quality-intro .stat-item {
        padding: 1.5rem;
        width: 100%;
    }
    
    .certificate-cta h2 {
        font-size: 2rem;
    }

    .modal-header {
        padding: 18px 20px;
    }
    
    .modal-header h3 {
        font-size: 1.2rem;
        padding-left: 12px;
    }
    
    .close-modal {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }
    
    .certificate-viewer {
        padding: 20px;
    }
    
    .certificate-viewer::before {
        top: 5px;
        left: 5px;
        right: 5px;
        bottom: 5px;
    }
    
    .certificate-viewer img {
        border-width: 8px;
    }
    
    .certificate-details {
        padding: 20px;
    }
    
    .detail-item {
        padding-left: 25px;
        margin-bottom: 15px;
    }
    
    .detail-item i {
        font-size: 1rem;
    }
    
    .modal-footer {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
    }
    
    .modal-footer .cert-validation {
        order: 2;
    }
    
    .btn-secondary {
        order: 1;
        width: 100%;
        justify-content: center;
    }

    .modal-header h3 {
        font-size: 1.3rem;
    }

    .certificate-details {
        padding: 20px;
        max-height: 25vh;
    }

    .detail-item {
        margin-bottom: 15px;
    }

    .detail-label {
        font-size: 0.9rem;
    }

    .detail-value {
        font-size: 0.9rem;
    }

    .btn-secondary {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .certificates-hero {
        height: 35vh;
    }
    
    .certificates-hero .hero-title {
        font-size: 2rem;
    }
    
    .quality-intro .section-title,
    .certification-benefit .section-title,
    .certificate-cta h2 {
        font-size: 1.8rem;
    }
    
    .certificate-image {
        height: 220px;
        padding: 10px 15px;
    }
    
    .certificates-section .filter-tabs {
        gap: 10px;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 10px;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
    }
    
    .certificates-section .filter-tabs li {
        padding: 8px 15px;
        font-size: 0.9rem;
        white-space: nowrap;
    }

    .modal-container {
        width: 95%;
        max-height: 85vh;
        height: 100%;
    }

    .modal-content {
        height: 100%;

    }
    
    .modal-header {
        padding: 15px;
    }

    .modal-body {
        height: 100%;
    }

    .modal-body .certificate-viewer,
    .modal-body .certificate-details {
        height: 100%;
        max-height: none;
    }

    
    .modal-header h3 {
        font-size: 1.1rem;
        padding-left: 10px;
    }
    
    .modal-header h3::before {
        width: 3px;
    }
    
    .certificate-viewer {
        padding: 15px;
    }
    
    .certificate-viewer img {
        border-width: 5px;
        max-height: calc(95vh - 270px);
    }
    
    .certificate-details {
        padding: 15px;
    }
    
    .detail-header h4 {
        font-size: 1.1rem;
    }
    
    .detail-header p {
        font-size: 0.85rem;
    }
    
    .detail-label, .detail-value {
        font-size: 0.9rem;
    }
    
    .modal-footer {
        padding: 12px 15px;
    }
    
    .modal-footer .cert-validation i {
        font-size: 1.1rem;
    }
    
    .modal-footer .cert-validation span {
        font-size: 0.8rem;
    }

    .modal-header {
        padding: 15px;
    }

    .modal-header h3 {
        font-size: 1.1rem;
    }

    .certificate-viewer {
        min-height: 30vh;
        padding: 10px;
    }

    .certificate-viewer img {
        border-width: 5px;
    }

    .certificate-details {
        padding: 15px;
    }

    .detail-item {
        margin-bottom: 12px;
    }

    .modal-footer {
        padding: 15px;
    }

    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 400px) {
    .quality-intro .stat-item {
        padding: 1.2rem;
    }

    .quality-intro .stat-number {
        font-size: 2rem;
    }

    .quality-intro .stat-text {
        font-size: 0.9rem;
    }

    .certificate-image {
        height: 200px;
    }

    .certificate-info {
        padding: 15px;
    }

    .certificate-info h4 {
        font-size: 1.1rem;
    }

    .certificate-viewer {
        min-height: 25vh;
    }
}