:root {
    --lime: #BAFF39;
    --lime-deep: #9FD930;
    --carbon: #383838;
    --slate: #5A5A5A;
    --stone: #6E6E6E;
    --card-bg: rgba(56, 56, 56, 0.92);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #FFFFFF;
    background: linear-gradient(135deg, #6E6E6E 0%, #5A5A5A 50%, #383838 100%);
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 60px);
    padding: 2rem 1rem;
}

main > div {
    background: var(--card-bg);
    border-top: 3px solid var(--lime);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    padding: 2.5rem 2rem;
    max-width: 520px;
    width: 100%;
    text-align: center;
}

h1 {
    margin: 0 0 1rem;
    font-weight: 700;
    font-size: 1.75rem;
    color: #FFFFFF;
}

p {
    margin: 0 0 0.75rem;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.9);
}

.hint {
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

footer {
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}