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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
}

h1 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.5rem;
    color: #2c3e50;
    font-weight: 600;
}

a {
    text-decoration: none;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 0;
}

.nav a {
    margin-left: 2rem;
    text-decoration: none;
    color: #555;
    transition: color 0.3s;
}

.nav a:hover {
    color: #3498db;
}



.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 20px 0;
}

.lab-card {
    background: white;
    border-radius: 12px;
    padding: 30px 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    text-align: center;
}

.lab-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

.lab-card h3 {
    color: #2980b9;
    margin-bottom: 15px;
    font-size: 1.4rem;
    font-weight: 600;
}

.lab-card p {
    color: #555;
    margin-bottom: 20px;
    font-size: 1rem;
}

.lab-link {
    display: inline-block;
    padding: 10px 25px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lab-link:hover {
    background: linear-gradient(135deg, #2980b9, #1c6ea4);
    transform: scale(1.05);
}

/* Адаптация для планшетов (768px — 1023px) */
@media (max-width: 1023px) {
    h1 {
        font-size: 2.2rem;
        margin-bottom: 30px;
    }
    
    .labs-grid {
        gap: 20px;
    }
    
    .lab-card {
        padding: 25px 20px;
    }
}

/* Адаптация для мобильных устройств (до 767px) */
@media (max-width: 767px) {
    body {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.8rem;
        margin-bottom: 25px;
    }
    
    .labs-grid {
        grid-template-columns: 1fr;
        gap: 18px;
        padding: 15px 0;
    }
    
    .lab-card {
        padding: 20px 15px;
    }
    
    .lab-card h3 {
        font-size: 1.3rem;
    }
    
    .lab-card p {
        font-size: 0.95rem;
    }
    
    .lab-link {
        padding: 9px 22px;
        font-size: 0.85rem;
    }
}

/* Дополнительная адаптация для очень маленьких экранов (до 480px) */
@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
    
    .lab-card {
        padding: 18px 12px;
    }
    
    .lab-card h3 {
        font-size: 1.2rem;
    }
    
    .lab-link {
        width: 100%;
        text-align: center;
        box-sizing: border-box;
    }
}