/* Number Memory */

.nm-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    user-select: none;
}

.nm-level {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-light);
    margin: 0;
}

/* Tabular figures keep the number from shifting width as digits change. */
.nm-number {
    font-size: clamp(2.2rem, 11vw, 4rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    font-variant-numeric: tabular-nums;
    min-height: 1.3em;
    display: flex;
    align-items: center;
    color: var(--color-text);
}

.nm-bar {
    width: min(320px, 80vw);
    height: 6px;
    background: var(--color-border-light);
    border-radius: 999px;
    overflow: hidden;
}

.nm-bar-fill {
    height: 100%;
    width: 0;
    background: var(--color-primary-dark);
    border-radius: 999px;
}

.nm-input {
    width: min(320px, 80vw);
    padding: 0.75rem 1rem;
    font-size: 1.5rem;
    text-align: center;
    letter-spacing: 0.08em;
    font-variant-numeric: tabular-nums;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card-bg);
    color: var(--color-text);
    display: none;
}

.nm-input:focus-visible {
    outline: 3px solid var(--color-primary-dark);
    outline-offset: 2px;
}

.nm-feedback {
    min-height: 1.4em;
    margin: 0;
    font-weight: 600;
}

.nm-correct { color: var(--color-success); }
.nm-wrong { color: var(--color-accent); }

.nm-btn {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: var(--color-text);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.nm-btn:hover { background: var(--color-primary-dark); }
.nm-btn:focus-visible {
    outline: 3px solid var(--color-text);
    outline-offset: 2px;
}

/* State machine: the input only exists during the typing phase, and the
   button only when there is something to press. */
.state-input .nm-input { display: block; }
.state-showing .nm-btn { visibility: hidden; }
.state-showing .nm-bar { visibility: visible; }
.state-idle .nm-bar,
.state-input .nm-bar,
.state-result .nm-bar { visibility: hidden; }