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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 30px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)" /></svg>');
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(0px) translateY(0px); }
    50% { transform: translateX(-20px) translateY(-20px); }
}

header img {
    height: 50px;
    margin-bottom: 15px;
    position: relative;
    z-index: 2;
}

main {
    padding: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: #2c3e50;
    text-align: center;
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 30px 0 20px;
    color: #2c3e50;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
}

h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 25px 0 15px;
    color: #34495e;
}

section {
    margin-bottom: 35px;
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

section:first-of-type {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

p {
    margin-bottom: 15px;
    font-size: 1rem;
    line-height: 1.7;
}

ul {
    margin: 15px 0;
    padding-left: 25px;
}

li {
    margin-bottom: 8px;
    position: relative;
}

li::marker {
    color: #667eea;
}

a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

a[href^="https://"]::after {
    content: ' ↗';
    font-size: 0.8em;
    opacity: 0.7;
}

strong {
    color: #2c3e50;
    font-weight: 600;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 25px 40px;
    font-size: 0.9rem;
    margin-top: auto;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    main {
        padding: 30px 25px;
    }
    
    section {
        padding: 20px;
    }
    
    header {
        padding: 25px 30px;
    }
    
    header img {
        height: 40px;
    }
    
    footer {
        padding: 20px 30px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 20px 15px;
    }
    
    section {
        padding: 15px;
    }
    
    header {
        padding: 20px 15px;
    }
}