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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}

header, main, footer {
    width: 100%;
    max-width: 800px;
    padding: 2rem 1.5rem;
    text-align: center;
}

header {
    padding-top: 4rem;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #1a1a2e;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

main p {
    font-size: 1.1rem;
    color: #555555;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

main p:first-child {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
}

footer {
    font-size: 0.85rem;
    color: #999999;
    border-top: 1px solid #e0e0e0;
    padding: 1.5rem;
    margin-top: auto;
}

@media (max-width: 600px) {
    header { padding-top: 2rem; }
    header h1 { font-size: 1.6rem; }
    main p { font-size: 1rem; }
    main p:first-child { font-size: 1.1rem; }
}