/* --- Секция сертификатов --- */
.certificates-section {
    padding: 80px 0;
    background: linear-gradient(to bottom, #ffffff, #f0f9f0);
    position: relative;
    overflow: hidden;
}

.certificates-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #2ecc71, #27ae60, #3498db);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.cert-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #2c3e50;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.section-divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, #2ecc71, #27ae60);
    margin: 0 auto 20px;
    border-radius: 2px;
}

.cert-subtitle {
    font-size: 1.2rem;
    color: #7f8c8d;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* --- Список сертификатов --- */
.cert-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 35px;
    margin-bottom: 50px;
}

/* --- Карточка сертификата --- */
.cert-item {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.cert-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(39, 174, 96, 0.15);
}

/* --- Обертка изображения --- */
.cert-image-wrapper {
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.cert-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.cert-item:hover .cert-img {
    transform: scale(1.05);
}

.cert-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(46, 204, 113, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.cert-item:hover .cert-overlay {
    opacity: 1;
}

.cert-overlay-icon {
    font-size: 3rem;
    color: white;
    opacity: 0.9;
}

/* --- Информация о сертификате --- */
.cert-name {
    font-size: 1.4rem;
    font-weight: 700;
    color: #2c3e50;
    margin: 20px 20px 10px;
    text-align: center;
}

.cert-desc {
    font-size: 0.95rem;
    color: #7f8c8d;
    line-height: 1.6;
    margin: 0 20px 20px;
    flex-grow: 1;
    text-align: center;
}

/* --- Вступительный текст --- */
.cert-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background: #e8f5e9;
    border-radius: 12px;
    border-left: 4px solid #2ecc71;
    border-right: 4px solid #2ecc71;
}

.cert-intro p {
    font-size: 1.1rem;
    color: #2c3e50;
    line-height: 1.7;
    margin: 0;
    font-weight: 500;
}

/* --- Модальное окно --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    opacity: 1;
}

.modal-content {
    position: relative;
    background-color: transparent;
    margin: auto;
    padding: 0;
    width: 90%;
    max-width: 1000px;
    top: 50%;
    transform: translateY(-50%) scale(0.8);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: translateY(-50%) scale(1);
}

.modal-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
}

.modal-caption {
    margin-top: 15px;
    text-align: center;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 10px;
    color: #aaa;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
}

.modal-close:hover,
.modal-close:focus {
    color: #fff;
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    font-size: 30px;
    padding: 15px 20px;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.3s ease;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.modal-prev {
    left: 15px;
}

.modal-next {
    right: 15px;
}

/* --- Адаптивность --- */
@media (max-width: 992px) {
    .cert-title {
        font-size: 2.2rem;
    }

    .cert-subtitle {
        font-size: 1.1rem;
    }

    .cert-list {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 25px;
    }

    .cert-img {
        height: 200px;
    }

    .cert-name {
        font-size: 1.3rem;
    }

    .cert-intro {
        padding: 20px 15px;
    }

    .cert-intro p {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .certificates-section {
        padding: 60px 0;
    }

    .cert-title {
        font-size: 2rem;
    }

    .cert-subtitle {
        font-size: 1rem;
    }

    .cert-list {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 20px;
    }

    .cert-img {
        height: 200px;
    }

    .cert-name {
        font-size: 1.2rem;
        margin: 15px 15px 8px;
    }

    .cert-desc {
        font-size: 0.9rem;
        margin: 0 15px 15px;
    }

    .modal-nav {
        width: 50px;
        height: 50px;
        font-size: 24px;
        padding: 10px 15px;
    }

    .modal-prev {
        left: 10px;
    }

    .modal-next {
        right: 10px;
    }
}

@media (max-width: 576px) {
    .certificates-section {
        padding: 50px 0;
    }

    .cert-title {
        font-size: 1.8rem;
    }

    .section-divider {
        width: 60px;
        height: 3px;
    }

    .cert-subtitle {
        font-size: 0.95rem;
    }

    .cert-list {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .cert-img {
        height: 220px;
    }

    .cert-name {
        font-size: 1.25rem;
    }

    .cert-intro {
        padding: 15px 10px;
    }

    .cert-intro p {
        font-size: 0.95rem;
    }

    .modal-content {
        width: 95%;
    }

    .modal-close {
        top: -35px;
        font-size: 35px;
    }

    .modal-nav {
        width: 45px;
        height: 45px;
        font-size: 20px;
        padding: 8px 12px;
    }

    .modal-prev {
        left: 10px;
    }

    .modal-next {
        right: 10px;
    }

    .modal-caption {
        font-size: 1rem;
    }
}

/* --- Секция сертификатов (адаптированная для мобильных) --- */
.certificates-section {
    padding: 80px 0 60px 0;
    background: linear-gradient(to bottom, #ffffff, #f0f9f0);
    position: relative;
    overflow: hidden;
}

.certificates-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #2ecc71, #27ae60, #3498db);
}

/* --- Заголовок секции --- */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #2c3e50;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #7f8c8d;
    max-width: 700px;
    margin: 0 auto 20px;
    line-height: 1.6;
}

.section-divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, #2ecc71, #27ae60);
    margin: 0 auto;
    border-radius: 2px;
}

/* --- Список сертификатов --- */
.cert-list {
    display: grid;
    /* Адаптивная сетка: от 2 до 4 колонок */
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

/* --- Элемент списка сертификатов --- */
.cert-item {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    padding: 20px 15px;
    width: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    position: relative;
    isolation: isolate; /* Создаем новый stacking context для z-index */
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid #e0e0e0;
}

.cert-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.15);
    border-color: #2ecc71;
}

/* --- Обёртка изображения сертификата --- */
.cert-image-wrapper {
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    overflow: hidden;
    border-radius: 12px;
    flex-shrink: 0;
}

.cert-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
    display: block;
}

.cert-item:hover .cert-img {
    transform: scale(1.05);
}

.cert-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f5f9;
    border-radius: 12px;
}

.placeholder-icon {
    font-size: 2.5rem;
    text-align: center;
    color: #cbd5e1;
}

/* --- Информация о сертификате --- */
.cert-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.cert-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 10px;
    transition: color 0.2s ease;
    line-height: 1.3;
}

.cert-item:hover .cert-name {
    color: #2563eb;
}

.cert-desc {
    font-size: 0.95rem;
    color: #64748b;
    line-height: 1.5;
    margin-bottom: 15px;
    flex-grow: 1;
}

/* --- Ссылка "Подробнее" --- */
.cert-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    background: linear-gradient(90deg, #2563eb, #22c55e);
    color: white;
    font-weight: 600;
    padding: 10px 15px;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
    letter-spacing: 0.5px;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.cert-link:hover {
    background: linear-gradient(90deg, #1d4ed8, #16a34a);
    box-shadow: 0 6px 15px rgba(37, 99, 235, 0.3);
    transform: translateY(-2px) scale(1.03);
}

.cert-icon {
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

.cert-link:hover .cert-icon {
    transform: translateX(3px);
}

/* --- Вступительный текст --- */
.cert-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    padding: 30px;
    background: #e8f5e9;
    border-radius: 16px;
    border-left: 4px solid #2ecc71;
    border-right: 4px solid #2ecc71;
}

.cert-intro p {
    font-size: 1.1rem;
    color: #2c3e50;
    line-height: 1.7;
    margin: 0;
    font-weight: 500;
}

/* --- Модальное окно для увеличенного изображения сертификата --- */
/* Модальное окно */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    opacity: 1;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    cursor: pointer;
}

.modal-content {
    position: relative;
    background-color: transparent;
    margin: auto;
    padding: 0;
    width: 90%;
    max-width: 1000px;
    top: 50%;
    transform: translateY(-50%) scale(0.8);
    transition: transform 0.3s ease;
    z-index: 2;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: 90vh;
}

.modal.show .modal-content {
    transform: translateY(-50%) scale(1);
}

.modal-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
    object-fit: contain;
    max-height: 80vh;
    margin: 0 auto;
}

.modal-caption {
    margin-top: 15px;
    text-align: center;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 10px;
    color: #aaa;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
    z-index: 3;
}

.modal-close:hover,
.modal-close:focus {
    color: #fff;
    outline: none;
}

/* Стрелки навигации */
.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    font-size: 30px;
    padding: 15px 20px;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.3s ease;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3;
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.modal-prev {
    left: 15px;
}

.modal-next {
    right: 15px;
}

/* --- Адаптивность --- */
@media (max-width: 1200px) {
    .certificates-section {
        padding: 70px 0 50px 0;
    }

    .section-title {
        font-size: 2.3rem;
    }

    .section-subtitle {
        font-size: 1.15rem;
    }

    .cert-list {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 25px;
    }

    .cert-item {
        padding: 18px 14px;
    }

    .cert-image-wrapper {
        height: 180px;
    }

    .cert-name {
        font-size: 1.15rem;
    }

    .cert-desc {
        font-size: 0.9rem;
    }

    .cert-link {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .cert-intro {
        padding: 25px 20px;
        margin-bottom: 35px;
    }

    .cert-intro p {
        font-size: 1.05rem;
    }

    .modal-content {
        max-width: 95vw;
    }

    .modal-img {
        max-height: 75vh;
    }

    .modal-caption {
        font-size: 1.1rem;
    }

    .modal-nav {
        width: 55px;
        height: 55px;
        font-size: 28px;
        padding: 12px 16px;
    }

    .modal-prev {
        left: 12px;
    }

    .modal-next {
        right: 12px;
    }
}

@media (max-width: 992px) {
    .certificates-section {
        padding: 60px 0 50px 0;
    }

    .section-title {
        font-size: 2.1rem;
    }

    .section-subtitle {
        font-size: 1.1rem;
    }

    .section-divider {
        width: 70px;
        height: 3px;
    }

    .cert-list {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 20px;
    }

    .cert-item {
        padding: 16px 12px;
        border-radius: 14px;
    }

    .cert-image-wrapper {
        height: 160px;
    }

    .cert-name {
        font-size: 1.1rem;
    }

    .cert-desc {
        font-size: 0.85rem;
        margin-bottom: 12px;
    }

    .cert-link {
        padding: 7px 10px;
        font-size: 0.85rem;
    }

    .cert-intro {
        padding: 20px 15px;
        margin-bottom: 30px;
        border-radius: 14px;
    }

    .cert-intro p {
        font-size: 1rem;
    }

    .modal-content {
        max-width: 90vw;
    }

    .modal-img {
        max-height: 70vh;
    }

    .modal-caption {
        font-size: 1rem;
    }

    .modal-nav {
        width: 50px;
        height: 50px;
        font-size: 26px;
        padding: 10px 14px;
    }

    .modal-prev {
        left: 10px;
    }

    .modal-next {
        right: 10px;
    }
}

@media (max-width: 768px) {
    .certificates-section {
        padding: 50px 0 40px 0;
    }

    .section-title {
        font-size: 1.9rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    .section-divider {
        width: 60px;
        height: 3px;
    }

    .cert-list {
        /* На мобильных 2 колонки */
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 18px;
    }

    .cert-item {
        padding: 14px 10px;
        border-radius: 12px;
    }

    .cert-image-wrapper {
        height: 140px;
    }

    .cert-name {
        font-size: 1rem;
    }

    .cert-desc {
        font-size: 0.8rem;
        margin-bottom: 10px;
    }

    .cert-link {
        padding: 6px 8px;
        font-size: 0.8rem;
    }

    .cert-intro {
        padding: 18px 12px;
        margin-bottom: 25px;
        border-radius: 12px;
    }

    .cert-intro p {
        font-size: 0.95rem;
    }

    .modal-content {
        max-width: 85vw;
        width: 95%;
    }

    .modal-img {
        max-height: 65vh;
    }

    .modal-caption {
        font-size: 0.95rem;
        margin-top: 12px;
    }

    .modal-nav {
        width: 45px;
        height: 45px;
        font-size: 24px;
        padding: 8px 12px;
    }

    .modal-prev {
        left: 8px;
    }

    .modal-next {
        right: 8px;
    }

    .modal-close {
        top: -35px;
        right: 8px;
        font-size: 35px;
    }
}

@media (max-width: 480px) {
    .certificates-section {
        padding: 40px 0 30px 0;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    .section-divider {
        width: 50px;
        height: 2px;
    }

    .cert-list {
        /* На очень маленьких экранах 1 колонка */
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .cert-item {
        max-width: 300px;
        margin: 0 auto;
        padding: 12px 8px;
        border-radius: 10px;
    }

    .cert-image-wrapper {
        height: 180px;
    }

    .cert-name {
        font-size: 1.1rem;
    }

    .cert-desc {
        font-size: 0.9rem;
        margin-bottom: 12px;
    }

    .cert-link {
        padding: 8px 12px;
        font-size: 0.9rem;
        width: 100%;
        max-width: 200px;
        margin: 0 auto;
    }

    .cert-intro {
        padding: 15px 10px;
        margin-bottom: 20px;
        border-radius: 10px;
    }

    .cert-intro p {
        font-size: 0.9rem;
    }

    .modal-content {
        max-width: 95vw;
        width: 95vw;
        top: 50%;
        transform: translateY(-50%) scale(0.8);
    }

    .modal.show .modal-content {
        transform: translateY(-50%) scale(1);
    }

    .modal-img {
        max-height: 60vh;
    }

    .modal-caption {
        font-size: 0.9rem;
        margin-top: 10px;
    }

    .modal-nav {
        width: 40px;
        height: 40px;
        font-size: 22px;
        padding: 6px 10px;
    }

    .modal-prev {
        left: 5px;
    }

    .modal-next {
        right: 5px;
    }

    .modal-close {
        top: -30px;
        right: 5px;
        font-size: 30px;
    }
}