.letter-demo-stage {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 29px;
    background: var(--paper);
    box-shadow: 0 12px 36px #354d3208;
}

.letter-mentor-scene {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    padding: 24px 12px 24px 24px;
    background: var(--paper);
}

.letter-mentor-scene img {
    display: block;
    width: 100%;
    height: 452px;
    object-fit: contain;
    object-position: center;
}

.letter-demo-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    padding: 30px;
}

.letter-demo-button {
    --action-cue-base-shadow: 0 5px 0 #dfe6d5;
    position: relative;
    width: min(100%, 340px);
    padding: 12px 18px 24px;
    border: 1px solid #e0e6d8;
    border-radius: 26px;
    background: #f5f7ef;
    color: var(--green);
    cursor: pointer;
    box-shadow: 0 5px 0 #dfe6d5;
    transition: border-color 160ms, transform 160ms;
}

.letter-demo-button:hover:not(:disabled) {
    border-color: #9eb397;
    transform: translateY(-2px);
}

.letter-demo-button:active:not(:disabled) {
    transform: translateY(2px);
}

.letter-demo-button:disabled {
    cursor: default;
}

.letter-demo-canvas {
    display: block;
    width: 100%;
    height: auto;
    overflow: visible;
}

.letter-guide {
    fill: none;
    stroke: #dae3d0;
    stroke-width: 1.5;
    stroke-dasharray: 4 8;
}

.letter-strokes {
    fill: none;
    stroke: currentColor;
    stroke-width: 18;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.stroke-number, .stroke-pen {
    opacity: 0;
}

.stroke-number.is-visible, .stroke-pen.is-visible {
    opacity: 1;
}

.stroke-number circle {
    fill: #d59d60;
}

.stroke-number text {
    fill: #fffef9;
    font-size: 18px;
    font-weight: 750;
    text-anchor: middle;
    dominant-baseline: central;
}

.stroke-pen {
    fill: #d59d60;
    stroke: var(--paper);
    stroke-width: 3;
}

.letter-listen-icon {
    position: absolute;
    right: 18px;
    bottom: 14px;
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--mint);
}

.letter-demo-hint {
    min-height: 26px;
    margin: 0;
    color: var(--muted);
    font-size: 15px;
    font-weight: 650;
    text-align: center;
}

.letter-demo-hint:empty {
    display: none;
}

@media (max-width: 640px) {
    .letter-demo-stage {
        grid-template-columns: 1fr;
    }

    .letter-mentor-scene {
        height: 180px;
        padding: 12px;
    }

    .letter-mentor-scene img {
        height: 156px;
    }

    .letter-demo-content {
        gap: 14px;
        padding: 24px 28px;
    }

    .letter-demo-button {
        width: min(100%, 260px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .letter-demo-button {
        transition: none;
    }

    .letter-demo-button:hover:not(:disabled), .letter-demo-button:active:not(:disabled) {
        transform: none;
    }
}