body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

header {
    background: #fff;
    color: #333;
    padding: 1rem 0;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: auto;
    padding: 0 2rem;
}

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

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

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #2980b9;
}

#hero {
    background: linear-gradient(rgba(44, 62, 80, 0.7), rgba(44, 62, 80, 0.7)), url('https://images.unsplash.com/photo-1518770660439-4636190af475?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwxMjA3fDB8MXxzZWFyY2h8Mnx8dGVjaG5vbG9neSUyMGJhY2tncm91bmR8fDB8fHx8MTYyODU4NjM5NQ&ixlib=rb-1.2.1&q=80&w=1920') no-repeat center center/cover;
    color: #fff;
    text-align: center;
    padding: 7rem 2rem;
}

#hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

#hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: #2980b9;
    color: #fff;
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1.1rem;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background: #1f638f;
}

section {
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: auto;
    text-align: center;
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #2c3e50;
}

#about p, #contact p {
    font-size: 1.1rem;
    color: #555;
    max-width: 800px;
    margin: 0 auto 1rem auto;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    text-align: left;
}

.research-item {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.research-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.research-item h3 {
    font-size: 1.5rem;
    color: #2980b9;
    margin-bottom: 0.5rem;
}

.research-item p {
    font-size: 1rem;
    color: #555;
}

#contact a {
    color: #2980b9;
    text-decoration: none;
}

#contact a:hover {
    text-decoration: underline;
}

footer {
    background: #2c3e50;
    color: #ecf0f1;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

footer p {
    margin: 0;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }

    nav ul {
        margin-top: 1rem;
        padding-left: 0;
    }

    nav ul li {
        margin: 0 10px;
    }

    #hero h1 {
        font-size: 2.5rem;
    }

    #hero p {
        font-size: 1.1rem;
    }

    section h2 {
        font-size: 2rem;
    }
}