html,
body {
    background: #e9ffd8;
    color: #18311f;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    margin: 0;
    min-height: 100%;
}

* {
    box-sizing: border-box;
}

.game-shell {
    display: grid;
    gap: 1.25rem;
    padding: clamp(1rem, 3vw, 2rem) 0 2rem;
    width: 100%;
}

.game-copy {
    max-width: 54rem;
    padding-inline: clamp(1rem, 3vw, 2rem);
}

.game-copy p {
    color: #415346;
    font-size: 1.05rem;
    margin: 0;
}

kbd {
    background: #18311f;
    border-radius: 0.35rem;
    box-shadow: inset 0 -0.12rem 0 rgba(255, 255, 255, 0.18);
    color: #fffbe8;
    font-size: 0.85em;
    padding: 0.16rem 0.42rem;
}

.game-frame {
    background: linear-gradient(135deg, #d9f5ff, #fff6cf);
    border: 0.45rem solid #184426;
    border-left: 0;
    border-radius: 0;
    border-right: 0;
    box-shadow: 0 1rem 2.5rem rgba(18, 48, 26, 0.22);
    overflow: hidden;
    width: 100%;
}

.dug-game {
    display: block;
    height: 540px;
    outline: none;
    width: 100%;
}

.dug-game:focus {
    box-shadow: inset 0 0 0 0.25rem rgba(255, 255, 255, 0.7);
}