:root {
    --primary: #004B87;
    --accent: #DDF247;
    --dark: #1d3557;
    --light: #fefee3;
    --neutral-500: #101010;
    --neutral-400: #2d2d2d;
    --neutral-300: #5a5a5a;
    --neutral-100: #f3f3f7;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

/* ===== GLOBAL STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--neutral-100);
    color: var(--neutral-500);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-weight: 600;
    color: var(--white);
}

a {
    text-decoration: none;
    color: inherit;
}

p {
    white-space: break-spaces;
}

button, .btn {
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
}

.container {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 120px;
}

.section {
    padding: 80px 0;
}

/* ===== HEADER & NAVIGATION ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
}

.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
}

.nav-links a {
    font-size: 16px;
    font-weight: 500;
    position: relative;
    padding: 8px 0;
    color: var(--dark);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.burger-menu span {
    width: 30px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero-section {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark);
    color: var(--white);
    border-radius: 0 0 200px 200px;
    overflow: hidden;
    margin-top: 65px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    z-index: 2;
    padding: 0 20px;
}

.hero-title {
    font-size: 72px;
    line-height: 1.1;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 24px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 850px;
    margin: 0 auto;
}

.logos-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.logos-container img {
    height: 92px;
    max-width: 100%;
    object-fit: contain;
    filter: brightness(0) invert(1);
    opacity: 0.9;
    transition: var(--transition);
}

.logos-container img:hover {
    opacity: 1;
    transform: translateY(-3px);
}

/* ===== SEARCH & FILTERS ===== */
.search-section {
    padding: 40px 0;
    display: flex;
    justify-content: center;
}

.search-container {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding-bottom: 20px;
}

.search-input {
    font-family: 'Montserrat', sans-serif;
    width: 100%;
    padding: 16px 24px;
    border: 1px solid var(--primary);
    border-radius: 100px;
    font-size: 16px;
    background: var(--white);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary);
}

.filters-container {
    display: flex;
    gap: 20px;
    margin: 20px 0 30px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark);
}

.filter-select {
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: 'Montserrat', sans-serif;
    font-size: 16px;
    background: white;
}

/* ===== COURSES SECTION ===== */
.courses-section {
    padding: 60px 0;
    background: var(--white);
    border-radius: 100px;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 36px;
}

.course-card {
    display: flex;
    flex-direction: column;
    position: relative;
    height: 100%;
    background: var(--white);
    border-radius: 30px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.free-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: #DDF247;
    color: black;
    padding: 2px 20px;
    border-radius: 0 30px 0 30px;
    font-size: 16px;
    font-weight: 600;
    font-style: italic;
    z-index: 20;
    box-shadow: 
        0 4px 8px rgba(0, 0, 0, 0.2),
        inset 0 -2px 0 rgba(0, 0, 0, 0.1),
        inset 0 2px 0 rgba(255, 255, 255, 0.2);
    letter-spacing: 0.5px;
}

.course-header {
    padding: 30px;
    background: var(--primary);
    color: var(--white);
}

.course-title {
    font-size: 24px;
    margin-bottom: 15px;
    line-height: 1.3;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.course-tag {
    flex: 0 0 auto;
    width: auto;
    max-width: 100%;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
}

.course-body {
    padding: 30px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--neutral-100);
}

.info-item {
    text-align: center;
    flex: 1;
}

.info-icon {
    max-width: 50px;
    margin-bottom: 8px;
}

.info-label {
    font-size: 16px;
    color: var(--neutral-300);
}

.details-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: var(--neutral-100);
    border: 1px solid var(--primary);
    border-radius: 100px;
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
    transition: var(--transition);
    margin-top: auto;
}

.details-button:hover {
    background: var(--primary);
    color: var(--white);
}

.details-button:hover img {
    filter: brightness(0) invert(1);
}

/* ===== FORM SECTION ===== */
.form-section {
    padding: 60px 0;
    background: var(--white);
    border-radius: 100px;
}

.form-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.yandex-form {
    display: block;
    margin: 0 auto;
}

.form-title {
    text-align: center;
    font-size: 36px;
    color: var(--primary);
    margin-bottom: 30px;
}

/* ===== EDUCATION SECTION ===== */
.education-section {
    padding: 60px 0;
    background: var(--dark);
    border-radius: 100px;
}

.education-container {
    margin: 0 auto;
    padding: 0 20px;
}

.education-title {
    text-align: center;
    font-size: 36px;
    color: var(--white);
    margin-bottom: 30px;
}

/* ===== FOOTER ===== */
footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0;
    border-radius: 100px 100px 0 0;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 30px;
}

.copyright {
    font-size: 16px;
    text-align: center;
    opacity: 0.8;
}

/* ===== MODAL WINDOWS ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    padding: 40px 20px;
    overflow-y: auto;
}

.modal.active {
    display: block;
}

.modal-content {
    position: relative;
    max-width: 900px;
    margin: 40px auto;
    background: var(--white);
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    animation: modalOpen 0.4s ease;
}

@keyframes modalOpen {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 30px;
    background: var(--primary);
    color: var(--white);
    position: relative;
}

.modal-title {
    font-size: 32px;
    margin-bottom: 15px;
    max-width: 80%;
}

.close-modal {
    position: absolute;
    top: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.modal-body {
    padding: 40px;
    max-height: 70vh;
    overflow-y: auto;
}

.modal-section {
    margin-bottom: 0;
}

.modal-section h2 {
    font-size: 24px;
    margin: 10px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--dark);
    color: var(--dark);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.details-grid .detail-card:nth-child(n+3) {
    grid-column: 1 / -1;
    width: 100%;
}

.detail-card {
    background: var(--neutral-100);
    border-left: 4px solid var(--primary);
    padding: 20px;
    border-radius: 0 8px 8px 0;
}

.detail-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--primary);
    font-weight: 600;
}

.detail-card p {
    font-size: 16px;
    font-weight: 500;
    color: var(--dark);
}

.contact-info {
    display: flex;
    gap: 15px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.contact-info a {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    color: var(--primary);
    transition: var(--transition);
}

.contact-info a:hover {
    transform: translateY(-5px);
}

.contact-info img {
    max-width: 30px;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.modal-buttons button {
    flex: 1;
    min-width: 0;
}

.apply-button, .ask-question-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 18px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 100px;
    font-size: 18px;
    font-weight: 500;
    transition: var(--transition);
}

.apply-button:hover, .ask-question-button:hover {
    background: var(--accent);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(214, 140, 69, 0.3);
}

/* ===== ACCORDION ===== */
.curriculum-accordion {
    margin-bottom: 20px;
}

.accordion-item {
    margin-bottom: 10px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.accordion-item:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.accordion-button {
    width: 100%;
    padding: 15px 20px;
    text-align: left;
    background-color: #f8f9fa;
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--primary);
    transition: background-color 0.3s ease;
}

.accordion-button:hover {
    background-color: #eef2f7;
}

.accordion-button::after {
    content: "▼";
    font-size: 12px;
    transition: transform 0.3s ease;
    margin-left: 10px;
}

.accordion-button.active::after {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, opacity 0.3s ease-out 0.1s;
    background-color: #fff;
    opacity: 0;
}

.accordion-button.active + .accordion-content {
    padding: 15px 20px;
    max-height: 600vh;
    opacity: 1;
}

.curriculum-accordion ul {
    list-style-type: none;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.curriculum-accordion li {
    padding: 10px 15px;
    border-left: 3px solid #e0e0e0;
    background: #f9f9f9;
    border-radius: 4px;
    position: relative;
    transition: all 0.2s ease;
}

.curriculum-accordion li:hover {
    border-left-color: var(--primary);
    background: #f0f7ff;
}

.download-program {
    margin-top: 25px;
    text-align: center;
}

.download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 25px;
    background-color: var(--dark);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.2s;
    border: none;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
    font-size: 16px;
    width: 100%;
}

.download-button:hover {
    background-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 75, 135, 0.2);
}

.download-button:active {
    transform: translateY(0);
}

.download-button img {
    filter: brightness(0) invert(1);
    max-width: 25px;
}

/* ===== UTILITY ELEMENTS ===== */
.scroll-up {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
    z-index: 999;
    opacity: 0.8;
}

.scroll-up:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    opacity: 1;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.overlay.active {
    display: block;
}

.close-menu {
    position: fixed;
    top: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    display: none;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    z-index: 1000;
    transition: var(--transition);
}

.close-menu:hover {
    background: var(--accent);
    transform: rotate(90deg);
}

.nav-links.active ~ .close-menu {
    display: flex;
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 1200px) {
    .container {
        padding: 0 60px;
    }
    .hero-title {
        font-size: 60px;
    }
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
    .logos-container img {
        height: 55px;
    }
}

@media (max-width: 992px) {
    .container {
        padding: 0 40px;
    }
    .hero-section {
        height: 300px;
        border-radius: 0 0 150px 150px;
    }
    .hero-title {
        font-size: 48px;
    }
    .burger-menu {
        display: flex;
    }
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 300px;
        background: var(--white);
        flex-direction: column;
        align-items: center;
        text-align: center;
        justify-content: center;
        gap: 30px;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 999;
        transition: all 0.5s ease;
    }
    .nav-links.active {
        right: 0;
        text-align: center;
    }
    .nav-links li {
        opacity: 0;
        transform: translateX(50px);
        transition: all 0.4s ease;
    }
    .nav-links.active li {
        opacity: 1;
        transform: translateX(0);
    }
    .nav-links li:nth-child(1) { transition-delay: 0.1s; }
    .nav-links li:nth-child(2) { transition-delay: 0.2s; }
    .nav-links li:nth-child(3) { transition-delay: 0.3s; }
    .nav-links li:nth-child(4) { transition-delay: 0.4s; }
    .nav-links li:nth-child(5) { transition-delay: 0.5s; }
    .nav-links a {
        font-size: 20px;
    }
    .close-menu {
        display: none;
    }
    .nav-links.active ~ .close-menu {
        display: flex;
    }
    .logos-container img {
        height: 55px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    .hero-section {
        height: 250px;
        border-radius: 0 0 100px 100px;
        margin-top: 65px;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 13px;
    }
    .section {
        padding: 60px 0;
    }
    .courses-grid {
        grid-template-columns: 1fr;
    }
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    .scroll-up {
        bottom: 20px;
        right: 20px;
    }
    .modal-body {
        padding: 20px;
    }
    .modal-content {
        margin: 20px auto;
    }
    .details-grid {
        grid-template-columns: 1fr;
    }
    .logos-container img {
        height: 41px;
    }
    .form-title {
        font-size: 28px;
    }
    .form-container iframe {
        max-width: 500px;
    }
    .yandex-form {
        width: 100%;
        max-width: 500px;
    }
}

@media (max-width: 576px) {
    .hero-section {
        border-radius: 0 0 40px 40px;
    }
    .hero-title {
        font-size: 32px;
    }
    .modal-header {
        padding: 20px;
    }
    .modal-title {
        font-size: 18px;
    }
    .contact-info {
        flex-direction: column;
        align-items: flex-start;
    }
    .logos-container img {
        height: 40px;
    }
    .logos-container {
        gap: 10px;
    }
    .course-meta {
        flex-direction: column;
        align-items: flex-start;
    }
    .course-title {
        font-size: 18px;
    }
    .course-tag {
        font-size: 12px;
        white-space: normal;
    }
    .info-label {
        font-size: 18px;
    }
    .modal-section h2 {
        font-size: 18px;
    }
    .apply-button, .ask-question-button {
        font-size: 14px;
    }
    .courses-section {
        border-radius: 40px;
        padding: 20px 0;
    }
    footer {
        border-radius: 40px 40px 0 0;
    }
    .free-badge {
        font-size: 12px;
    }
    .search-container {
        padding-bottom: 0;
    }
    .form-title {
        font-size: 24px;
    }
    .form-section {
        border-radius: 40px;
    }
    .form-container iframe {
        max-width: 330px;
    }
    .yandex-form {
        max-width: 330px;
    }
    .ask-question-button {
        padding: 14px;
        font-size: 14px;
    }
    .modal-buttons {
        flex-direction: column;
        gap: 10px;
    }
}