.board-frame {
    position: relative;
}

.board-frame.puzzle-concealed {
    min-height: 320px;
}

.puzzle-reveal {
    position: absolute;
    inset: 0;
    z-index: 20;
    display: grid;
    min-width: min(100%, 320px);
    min-height: 320px;
    place-items: center;
    box-sizing: border-box;
    padding: 24px;
    border: 2px solid var(--divider-color);
    background: color-mix(in srgb, var(--global-bg) 24%, transparent);
    color: var(--primary-text);
}

.puzzle-reveal[hidden] {
    display: none;
}

.puzzle-reveal-content {
    display: grid;
    width: min(100%, 360px);
    padding: 24px;
    gap: 12px;
    border: 2px solid var(--divider-color);
    background: var(--menu-bg);
    text-align: center;
}

.puzzle-reveal-kicker {
    color: var(--secondary-text);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    line-height: 1.2;
    text-transform: uppercase;
}

.puzzle-reveal h2 {
    margin: 0;
    overflow-wrap: anywhere;
    color: var(--secondary-text);
    font-size: clamp(1.55rem, 5vw, 2.25rem);
    line-height: 1.08;
}

.puzzle-reveal-meta,
.puzzle-reveal-instruction {
    margin: 0;
    line-height: 1.45;
}

.puzzle-reveal-meta {
    color: var(--secondary-text);
    font-size: 0.9rem;
    font-weight: 750;
}

.puzzle-reveal-record {
    margin: 4px 0 0;
    border-block: 1px solid var(--divider-color);
}

.puzzle-reveal-record > div {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: baseline;
    min-height: 52px;
    padding: 10px 0;
    gap: 16px;
}

.puzzle-reveal-record dt {
    color: var(--secondary-text);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-align: left;
    text-transform: uppercase;
}

.puzzle-reveal-record dd {
    margin: 0;
    color: var(--secondary-text);
    font-size: 1rem;
    font-variant-numeric: tabular-nums;
    font-weight: 850;
}

.puzzle-reveal-instruction {
    color: var(--secondary-text);
    font-size: 0.82rem;
}

.puzzle-reveal-button {
    width: 100%;
    min-height: 52px;
    margin-top: 4px;
    color: var(--button-text);
    border-color: var(--button-bg);
    background: var(--button-bg);
    font-weight: 850;
    touch-action: manipulation;
}

.puzzle-reveal-button:hover {
    color: var(--button-text);
    border-color: var(--button-active-bg);
    background: var(--button-active-bg);
}

.puzzle-reveal-button:active {
    color: var(--button-text);
    background: var(--button-active-bg);
}

.puzzle-reveal-button:focus-visible {
    outline: 3px solid var(--button-focus-ring);
    outline-offset: 3px;
}

.puzzle-concealed #grid-wrapper {
    opacity: 0.72;
    pointer-events: none;
    user-select: none;
}

.puzzle-concealed .hit-count-rows,
.puzzle-concealed .hit-count-column {
    position: relative;
    color: transparent;
}

.puzzle-concealed .concealed-hint-slot::before {
    display: block;
    width: 58%;
    height: 32%;
    margin: auto;
    content: "";
    border: 1px solid color-mix(in srgb, var(--divider-color) 78%, transparent);
    background-color: color-mix(in srgb, var(--secondary-text) 30%, var(--menu-bg));
}

.puzzle-concealed .concealed-hint-slot:nth-child(3n)::before {
    width: 34%;
}

.puzzle-concealed .concealed-hint-slot:nth-child(4n)::before {
    width: 72%;
}

.board-frame.is-revealing #grid-wrapper {
    animation: reveal-grid 220ms ease-out both;
}

.board-frame.is-revealing .puzzle-reveal {
    animation: dismiss-reveal 220ms ease-out both;
}

@keyframes reveal-grid {
    from { opacity: 0.72; }
    to { opacity: 1; }
}

@keyframes dismiss-reveal {
    from { opacity: 1; }
    to { opacity: 0; }
}

@media (max-width: 760px), (max-width: 900px) and (max-height: 500px) {
    .puzzle-reveal {
        min-width: 100%;
        min-height: min(58dvh, 440px);
        padding: 20px 16px;
    }

    .puzzle-reveal-content {
        padding: 20px 16px;
    }

    .puzzle-reveal-content {
        width: min(100%, 420px);
    }

    .puzzle-reveal-button {
        min-height: 56px;
    }
}

@media (max-height: 500px) and (orientation: landscape) {
    .puzzle-reveal {
        min-height: 250px;
        padding-block: 12px;
    }

    .puzzle-reveal-content {
        grid-template-columns: minmax(0, 1fr) minmax(180px, 0.8fr);
        align-items: center;
        gap: 8px 20px;
        text-align: left;
    }

    .puzzle-reveal-kicker,
    .puzzle-reveal h2,
    .puzzle-reveal-meta {
        grid-column: 1;
    }

    .puzzle-reveal-record,
    .puzzle-reveal-instruction,
    .puzzle-reveal-button {
        grid-column: 2;
    }

    .puzzle-reveal-record {
        grid-row: 1 / span 2;
        width: 100%;
    }

    .puzzle-reveal-instruction {
        grid-row: 3;
    }

    .puzzle-reveal-button {
        grid-row: 4;
    }
}

@media (prefers-reduced-motion: reduce) {
    .puzzle-reveal-button,
    .board-frame.is-revealing #grid-wrapper,
    .board-frame.is-revealing .puzzle-reveal {
        transition: none;
        animation: none;
    }
}