/*
 * StackO!'s look: a synthwave sky with the tower drawn on a canvas in front of it.
 *
 * The sky is CSS, not canvas. It never changes and never animates, so repainting it every
 * frame alongside the tower would be work for nothing — the canvas clears to transparent and
 * the gradient shows through.
 */

.gstacko {
    --ink: #060a1c;
    --sky-top: #04060f;
    --sky-bottom: #0d1440;
    --cyan: #3de0ff;
    --magenta: #ff5cc8;
    --text-primary: #eaf3ff;
    --text-secondary: #7fa0c8;

    /*
     * Measured by adding up the parts at 375px wide — bar, panel, ad slot and the gaps. It read
     * 300 while the panel still carried a status line; that line moved onto the board, and the
     * board should get the height back rather than leave 70px of nothing under the ad slot.
     *
     * Re-measured after the gap below the board went from 16px to 32px, and at a desktop
     * width as well as a phone one — the figure came out the same at both, so there is one
     * number here rather than Rekta's split. It was 236, which is under the real 256, and
     * declaring less than the chrome takes lets the board grow into space the page does not
     * have.
     */
    --play-chrome-stacked: 258px;
}

body.gstacko {
    background: linear-gradient(180deg, #0a1030 0%, #060a1c 100%);
    color: var(--text-primary);
}

/* The site's animated mesh is built for the light pages and fights the neon here. */
body.gstacko::before {
    display: none;
}

.gstacko .play-bar .play-home,
.gstacko .play-bar a.play-quiet {
    color: var(--text-secondary);
}

.gstacko .play-bar a.play-quiet:hover {
    background: rgba(61, 224, 255, 0.12);
    color: var(--text-primary);
}

.gstacko .play-title {
    color: var(--text-primary);
    font-size: 1.3rem;
    white-space: nowrap;
}

.gstacko .stat {
    background: rgba(10, 16, 48, 0.8);
    border: 1px solid rgba(61, 224, 255, 0.28);
    border-radius: 10px;
    padding: 4px 9px;
    min-width: 52px;
    text-align: center;
    line-height: 1.1;
}

.gstacko .stat-label {
    display: block;
    font-size: 0.58rem;
    letter-spacing: 0.09em;
    color: var(--text-secondary);
    font-weight: 700;
}

.gstacko .stat-value {
    font-size: 0.95rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.gstacko .play-button {
    background: rgba(61, 224, 255, 0.1);
    border-color: rgba(61, 224, 255, 0.35);
    color: var(--text-primary);
}

.gstacko .play-button:hover:not(:disabled) {
    background: rgba(61, 224, 255, 0.2);
}

.gstacko .play-button[aria-pressed="true"] {
    background: var(--cyan);
    border-color: transparent;
    color: #04060e;
}

.gstacko .play-hint {
    color: var(--text-secondary);
}

.gstacko .play-warning {
    color: #ffd9dd;
    background: rgba(255, 92, 110, 0.16);
}

/* ---------- the tower ---------- */

.gstacko .play-board {
    --board-max: 460px;
    /* Portrait, like the app: the tower grows upwards and the slab's travel is what sets the
       width, so a tall frame wastes nothing. */
    --board-ratio: 0.66;

    background:
        radial-gradient(120% 70% at 50% 100%, rgba(255, 92, 200, 0.16), transparent 60%),
        linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
    border: 1px solid rgba(61, 224, 255, 0.22);
    border-radius: 14px;
    overflow: hidden;
    /* The tap surface for the whole game. Without this the first drag scrolls the page
       instead of dropping a slab. */
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
}

/* The horizon line, drawn once in CSS rather than every frame on the canvas. */
.gstacko .play-board::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 62%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(61, 224, 255, 0.35), transparent);
}

.gstacko canvas {
    position: absolute;
    inset: 0;
    display: block;
}

/* ---------- result card ---------- */

.gstacko .sheet {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(4, 6, 15, 0.72);
}

.gstacko .sheet[hidden] {
    display: none;
}

.gstacko .sheet-card {
    background: #0c1236;
    border: 1px solid rgba(61, 224, 255, 0.3);
    border-radius: 18px;
    padding: 26px;
    max-width: 340px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.gstacko .sheet-card h2 {
    margin: 0 0 8px 0;
    font-size: 1.5rem;
    color: var(--cyan);
}

.gstacko .sheet-card p {
    margin: 0 0 16px 0;
    color: var(--text-secondary);
    font-weight: 600;
}

.gstacko .sheet-card .play-row {
    justify-content: center;
}

.gstacko .sheet-card .play-button {
    background: var(--cyan);
    border-color: transparent;
    color: #04060e;
}

.gstacko .sheet-card .play-button.ghost {
    background: transparent;
    border-color: rgba(61, 224, 255, 0.35);
    color: var(--text-secondary);
}

/*
 * The board's readout: the one instruction to begin, then the block count and the streak.
 * It lives here rather than in the panel because a player watching the slab should not have
 * to look away from it to read what their own tap was worth.
 *
 * Only the opening line pulses. Once the run is under way the text changes on every drop, and
 * a number that also breathes is harder to read, not livelier.
 */
.gstacko .board-hint {
    position: absolute;
    left: 0;
    right: 0;
    /* High in the frame, clear of the tower. The tower's top is held around the middle by the
       camera, so anything lower than this ends up reading through the slab. */
    top: 8%;
    margin: 0;
    text-align: center;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: rgba(234, 243, 255, 0.72);
    text-shadow: 0 0 18px rgba(4, 6, 15, 0.9);
    pointer-events: none;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.gstacko .board-hint.idle {
    color: rgba(234, 243, 255, 0.92);
    text-shadow: 0 0 18px rgba(61, 224, 255, 0.75);
    animation: stacko-hint 1.8s ease-in-out infinite;
}

/* A perfect is the one thing worth shouting about, so it is the one thing that changes. */
.gstacko .board-hint.perfect {
    color: #fff;
    text-shadow: 0 0 22px rgba(61, 224, 255, 0.95);
}

@keyframes stacko-hint {
    50% {
        opacity: 0.45;
    }
}

/* The switcher panel, in this game's colours rather than the shell's light default. */
.gstacko .play-menu {
    --menu-bg: #0c1236;
    --menu-fg: var(--text-primary);
    --menu-line: rgba(61, 224, 255, 0.22);
    --menu-hover: rgba(61, 224, 255, 0.16);
}