:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #333;
    --bg-color: #f9f9f9;
    --content-bg: #ffffff;
    --font-main: 'Roboto', sans-serif;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.nav-links li a {
    text-decoration: none;
    color: #ecf0f1;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--accent-color);
}

main {
    flex: 1;
    padding: 40px 0;
}

.content-card {
    background: var(--content-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

h1,
h2,
h3 {
    color: var(--primary-color);
}

h1 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer {
    background-color: var(--secondary-color);
    color: #ecf0f1;
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
}

/* Research Images */
.research-img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 15px 0;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
}