* {
    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;
}

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

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

nav h1 {
    color: white;
    font-size: 1.8rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

nav a:hover {
    color: #ffd700;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 2rem 2rem;
}

section {
    background: rgba(255, 255, 255, 0.9);
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

h2 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 2rem;
}

p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

button {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

#message {
    margin-top: 1rem;
    font-weight: bold;
    color: #667eea;
    font-size: 1.2rem;
}

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

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        gap: 1rem;
    }
    
    main {
        padding: 10rem 1rem 2rem;
    }
    
    section {
        padding: 1.5rem;
    }
}