* {
    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%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 1rem;
}

nav li {
    margin: 0 1.5rem;
}

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

nav a:hover {
    color: #667eea;
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 90%;
}

h1 {
    color: #667eea;
    margin-bottom: 1rem;
    text-align: center;
}

.feature-box {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

footer {
    text-align: center;
    padding: 1rem;
    color: white;
    background: rgba(0,0,0,0.2);
}