* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--bg-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo img {
    border-radius: 8px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.cart-link {
    position: relative;
}

.cart-count {
    position: absolute;
    top: -8px;
    right: -12px;
    background: var(--error-color);
    color: white;
    border-radius: 50%;
    padding: 2px 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.cta-button-secondary {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background 0.3s;
}

.cta-button-secondary:hover {
    background: var(--secondary-color);
}

.advantages {
    padding: 5rem 0;
    background: var(--bg-light);
}

.advantages h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.advantage-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
}

.advantage-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.advantage-card h3 {
    margin-bottom: 1rem;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 1.1rem;
}

.cta-section {
    text-align: center;
}

.about-courses {
    padding: 5rem 0;
}

.about-courses h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.about-content p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

.quality-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 8px;
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-item h4 {
    margin-bottom: 0.5rem;
}

.beginners-block {
    padding: 5rem 0;
    background: var(--bg-light);
}

.beginners-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.beginners-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.beginners-features {
    list-style: none;
    margin: 2rem 0;
}

.beginners-features li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.beginners-features i {
    color: var(--success-color);
}

.beginners-icon {
    font-size: 10rem;
    color: var(--primary-color);
    text-align: center;
    opacity: 0.1;
}

.catalog {
    padding: 5rem 0;
}

.catalog h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.product-image {
    position: relative;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--error-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    margin-bottom: 0.5rem;
}

.product-description {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.product-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.product-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-view,
.btn-add-cart {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.btn-view {
    background: var(--bg-light);
    color: var(--text-color);
}

.btn-view:hover {
    background: var(--border-color);
}

.btn-add-cart {
    background: var(--primary-color);
    color: white;
}

.btn-add-cart:hover {
    background: var(--secondary-color);
}

.product-detail {
    padding: 5rem 0;
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.product-detail-image img {
    width: 100%;
    border-radius: 12px;
}

.product-detail-info h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stars {
    color: var(--warning-color);
}

.rating-text {
    color: var(--text-light);
}

.product-detail-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
}

.product-detail-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.product-features h3 {
    margin-bottom: 1rem;
}

.product-features ul {
    list-style: none;
    margin-bottom: 2rem;
}

.product-features li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.product-features i {
    color: var(--success-color);
}

.product-actions-detail {
    display: flex;
    gap: 1rem;
}

.btn-buy-now {
    flex: 1;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-buy-now:hover {
    background: var(--secondary-color);
}

.cart-page,
.checkout-page,
.success-page,
.contact-page {
    padding: 5rem 0;
    min-height: 60vh;
}

.cart-page h1,
.checkout-page h1,
.success-page h1,
.contact-page h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.empty-cart {
    text-align: center;
    padding: 4rem 0;
}

.empty-cart i {
    font-size: 5rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.cart-items {
    margin-bottom: 2rem;
}

.cart-item {
    display: grid;
    grid-template-columns: 100px 1fr auto;
    gap: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.cart-item-image img {
    width: 100%;
    border-radius: 8px;
}

.cart-item-info h3 {
    margin-bottom: 0.5rem;
}

.cart-item-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.cart-item-remove {
    background: var(--error-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    align-self: start;
}

.cart-summary {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-row.total {
    font-size: 1.5rem;
    font-weight: 700;
    border-bottom: none;
}

.checkout-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    text-decoration: none;
    display: block;
    text-align: center;
}

.checkout-btn:hover {
    background: var(--secondary-color);
}

.checkout-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.checkout-form h2,
.order-summary h2 {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-order,
.submit-contact {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
}

.submit-order:hover,
.submit-contact:hover {
    background: var(--secondary-color);
}

.order-summary {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    height: fit-content;
}

.order-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.success-content {
    text-align: center;
    padding: 4rem 0;
}

.success-icon {
    width: 100px;
    height: 100px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin: 0 auto 2rem;
}

.success-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-details {
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

footer {
    background: var(--text-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    transition: background 0.3s;
}

.social-links a:hover {
    background: rgba(255,255,255,0.2);
}

.contact-info li {
    display: flex;
    gap: 0.5rem;
    align-items: start;
    margin-bottom: 1rem;
}

.contact-info i {
    margin-top: 0.25rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 -4px 6px rgba(0,0,0,0.1);
    padding: 2rem;
    z-index: 1000;
    display: none;
}

.cookie-consent.show {
    display: block;
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-text h4 {
    margin-bottom: 0.5rem;
}

.cookie-text a {
    color: var(--primary-color);
}

.cookie-buttons {
    display: flex;
    gap: 1rem;
    flex-shrink: 0;
}

.cookie-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.cookie-btn.accept {
    background: var(--primary-color);
    color: white;
}

.cookie-btn.accept:hover {
    background: var(--secondary-color);
}

.cookie-btn.reject {
    background: var(--bg-light);
    color: var(--text-color);
}

.cookie-btn.reject:hover {
    background: var(--border-color);
}

.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 1001;
    display: none;
    animation: slideIn 0.3s ease-out;
}

.notification.show {
    display: block;
}

.notification.success {
    border-left: 4px solid var(--success-color);
}

.notification.error {
    border-left: 4px solid var(--error-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .advantages-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }

    .product-detail-grid,
    .checkout-grid,
    .contact-grid,
    .beginners-content {
        grid-template-columns: 1fr;
    }

    .cart-item {
        grid-template-columns: 80px 1fr;
        gap: 1rem;
    }

    .cart-item-remove {
        grid-column: 1 / -1;
    }

    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-buttons {
        flex-direction: column;
        width: 100%;
    }

    .cookie-btn {
        width: 100%;
    }
}

@media print {
    header,
    footer,
    .cookie-consent,
    .notification {
        display: none;
    }
}