body {
    margin: 0;
    background-color: #000000;
    overflow: hidden;
    color: #ffffff;
    font-family: 'Courier New', Courier, monospace;
}

/* Touches on the game never scroll, zoom, select or pull to refresh. */
html,
body {
    touch-action: none;
    overscroll-behavior: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* The play area. On touch screens it leaves room for the controls:
   below it in portrait, beside it in landscape. */
.stage {
    position: fixed;
    inset: 0;
}

/* Touch pad: rotate left and right, one row; Thrust and Pause beside it in
   portrait, stacked at the right edge (Thrust at the bottom) in landscape. */
.gk-touch .gk-dpad {
    grid-template-columns: repeat(2, 60px);
    grid-template-rows: 60px;
    gap: 8px;
}

.gk-touch .gk-dpad button {
    grid-area: auto;
}

.gk-has-touch .stage {
    bottom: calc(72px + 12px + max(16px, env(safe-area-inset-bottom)));
}

@media (orientation: landscape) {
    .gk-touch .gk-buttons {
        flex-direction: column-reverse;
        flex-wrap: nowrap;
        align-items: stretch;
        gap: 10px;
    }

    .gk-has-touch .stage {
        bottom: 0;
        left: calc(128px + 12px + max(16px, env(safe-area-inset-left)));
        right: calc(72px + 12px + max(16px, env(safe-area-inset-right)));
    }
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* The HUD canvas sits on top of the WebGL view. */
canvas.hud {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.menu {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: max(48px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
    overflow-y: auto;
    touch-action: pan-y;
    text-align: center;
    background: rgba(0, 0, 0, 0.72);
}

/* Centred when it fits, scrollable from the top when it doesn't. */
.menu > :first-child {
    margin-top: auto;
}

.menu > :last-child {
    margin-bottom: auto;
}

.menu[hidden] {
    display: none;
}

.menu h1 {
    margin: 0;
    font-size: clamp(36px, 9vw, 64px);
    font-weight: normal;
    letter-spacing: 0.2em;
    padding-left: 0.2em;
}

.tagline,
.opt-note,
.touch-keys,
.best,
.result {
    margin: 0;
    max-width: 34em;
    font-size: 15px;
    line-height: 1.4;
}

.opt-note {
    font-size: 13px;
    opacity: 0.7;
}

.result {
    padding: 6px 12px;
    border: 1px solid #ffffff;
}

.opt {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.opt-label {
    width: 100%;
    font-size: 13px;
    opacity: 0.7;
}

.menu button {
    min-height: 44px;
    padding: 6px 14px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: #000000;
    color: #ffffff;
    font: inherit;
    font-size: 16px;
    cursor: pointer;
}

.menu button[aria-pressed='true'] {
    border-color: #ffffff;
    background: #ffffff;
    color: #000000;
}

.menu button:hover,
.menu button:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

.menu .start {
    min-width: 200px;
    border: 2px solid #ffffff;
    font-size: 24px;
    letter-spacing: 0.2em;
}

.keys {
    display: grid;
    grid-template-columns: auto auto;
    gap: 4px 16px;
    margin: 0;
    font-size: 15px;
}

.keys dt {
    text-align: right;
}

.keys dd {
    margin: 0;
    text-align: left;
}

.touch-keys,
.gk-has-touch .keys {
    display: none;
}

.gk-has-touch .touch-keys {
    display: block;
}

/* Short landscape screens: tighter menu, the two settings side by side. */
@media (orientation: landscape) and (max-height: 500px) {
    .menu:not([hidden]) {
        display: grid;
        grid-template-columns: auto auto;
        justify-content: center;
        align-content: safe center;
        gap: 8px 24px;
        padding-top: max(12px, env(safe-area-inset-top));
        padding-bottom: max(12px, env(safe-area-inset-bottom));
    }

    .menu > * {
        grid-column: 1 / -1;
        justify-self: center;
    }

    .menu > .opt {
        grid-column: auto;
    }

    /* Difficulty and terrain share a row; the note about difficulty goes below. */
    .menu > .opt-note,
    .menu > .opt-note ~ :not(.opt) {
        order: 1;
    }

    .menu > :first-child,
    .menu > :last-child {
        margin: 0;
    }

    .menu h1 {
        font-size: 30px;
    }

    .tagline,
    .opt-note {
        max-width: 44em;
        font-size: 12px;
    }

    /* Each setting: its label over one row of buttons. */
    .opt {
        display: grid;
        grid-auto-flow: column;
        justify-content: center;
        gap: 4px 6px;
    }

    .opt-label {
        grid-row: 1;
        grid-column: 1 / -1;
    }

    .menu .opt button {
        grid-row: 2;
        padding: 6px 10px;
        font-size: 14px;
        white-space: nowrap;
    }

    .menu .start {
        min-height: 44px;
        padding-block: 0;
    }
}