body {
    margin: 0;
    font-family: Arial, sans-serif;
}

.hero {
    background: url('biotech-bg.jpg') no-repeat center center/cover;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}

.overlay {
    background: rgba(0,0,0,0.5);
    padding: 40px;
    border-radius: 12px;
    color: #fff;
}

.logo {
    width: 140px;
    margin-bottom: 20px;
}

.navbar {
    background: #111;
    padding: 15px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0;
    margin: 0;
}

.navbar ul li {
    margin: 0 15px;
}

.navbar ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
}

.section {
    padding: 40px;
    text-align: center;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
    gap: 15px;
    padding: 20px;
}

.card {
    background: #f2f2f2;
    padding: 20px;
    border-radius: 10px;
    font-weight: bold;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.btn {
    background: #ff9900;
    padding: 12px 24px;
    color: #000;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
}

footer {
    background: #000;
    color: #fff;
    text-align: center;
    padding: 15px;
}