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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #e6eefc;
    background: radial-gradient(circle at 20% 20%, #1d4f8f 0%, #0b2a4a 45%, #06182c 100%);
    min-height: 100vh;
    text-align: center;
    padding-top: 2.5rem;
}

header {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

a {
    text-decoration: none;
    color: inherit;
}

button, a.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover, a.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

main {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
}

section {
    background: white;
    border-radius: 12px;
    padding: 3rem;
    margin-bottom: 2rem;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
}

h1, h2, h3 {
    margin-bottom: 1rem;
    color: #f4f8ff;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: 0.04em;
}

footer {
    background: rgba(255, 255, 255, 0.95);
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    color: #666;
}