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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

header h1 {
    display: inline-block;
    color: #764ba2;
    font-size: 1.5rem;
}

nav {
    float: right;
    margin-top: 0.5rem;
}

nav a {
    text-decoration: none;
    color: #333;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #764ba2;
}

main {
    margin-top: 80px;
    padding: 2rem;
}

#hero {
    text-align: center;
    padding: 4rem 0;
    color: white;
}

#hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

#hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

button {
    background: linear-gradient(45deg, #FF6B6B, #4ECDC4);
    border: none;
    padding: 15px 30px;
    border-radius: 30px;
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    color: #764ba2;
    margin-bottom: 1rem;
}

#analysis {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: 15px;
    margin-top: 2rem;
}

#chart {
    width: 100%;
    max-width: 800px;
    margin: 2rem auto;
    border: 1px solid #ddd;
    border-radius: 10px;
}

footer {
    text-align: center;
    padding: 2rem;
    color: white;
    background: rgba(0,0,0,0.2);
    margin-top: 2rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.2rem;
    }
    
    nav {
        float: none;
        margin-top: 1rem;
    }
    
    #hero h2 {
        font-size: 2rem;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
}