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

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    background-color: #f8f9fa;
    color: #333;
}

header {
    background: #2E86AB;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.main-header {
    text-align: center;
    margin-bottom: 2rem;
}

.main-header h1 {
    font-size: 2.5rem;
    color: #2E86AB;
}

.main-header p {
    font-size: 1.2rem;
    color: #555;
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: #e0e0e0;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.filter-btn.active {
    background: #2E86AB;
    color: white;
}

.catalog {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.category-section {
    margin-bottom: 2rem;
}

.category-title {
    font-size: 1.8rem;
    color: #2E86AB;
    margin-bottom: 1rem;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.card h3 a {
    color: #2E86AB;
    text-decoration: none;
    font-size: 1.2rem;
}

.card h3 a:hover {
    text-decoration: underline;
}

.card .school {
    color: #f18f01;
    font-weight: bold;
    margin: 0.5rem 0;
}

.card .preview {
    margin: 0.5rem 0;
    color: #555;
}

.rating {
    color: #f18f01;
    font-weight: bold;
    margin-top: 0.5rem;
}

.promo-badge {
    background: #e6f4ea;
    color: #137333;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
    display: inline-block;
    margin-top: 0.5rem;
}

.promo-section {
    background: #e6f4ea;
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    text-align: center;
    font-weight: bold;
    color: #137333;
}

.cta-btn {
    display: inline-block;
    background: #2E86AB;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 1rem;
    font-weight: bold;
}

.cta-btn:hover {
    background: #225f7d;
}

/* Адаптив */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 0.5rem 0;
    }

    .filters {
        justify-content: center;
    }

    .catalog {
        grid-template-columns: 1fr;
    }

    header {
        flex-direction: column;
        text-align: center;
    }

    header nav {
        margin-top: 1rem;
    }
}