/* ──────────────────────────────────────────────────────────────────────────
   BEM step-through explorers (theory_magnetostatics)
   Both figure containers use the same base styles.
   SVG graphics are generated by JS using CSS variable colours at render time,
   so only structural/layout rules are needed here.
────────────────────────────────────────────────────────────────────────── */

.bem-stepper-figure-block {
    margin: 1.25rem 0 1.75rem;
}

.bem-stepper {
    margin: 0;
    padding: 1rem 1.25rem 1.25rem;
    border: 1px solid var(--color-background-border);
    border-radius: 6px;
    background: var(--color-background-secondary);
    color: var(--color-foreground);
}

.bem-stepper > h4 {
    margin: 0 0 0.3rem;
    font-size: 0.925rem;
    font-weight: 600;
}

.bem-stepper > .bem-stepper-sub {
    margin: 0 0 0.75rem;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--color-foreground-secondary, var(--color-foreground-muted));
}

/* ── controls ─────────────────────────────────────────────────────────── */
.bem-stepper-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.6rem;
    margin-bottom: 0.75rem;
}

.bem-stepper-controls button {
    font: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3rem 0.85rem;
    border-radius: 4px;
    border: 1px solid var(--color-background-border);
    background: var(--color-background);
    color: var(--color-foreground);
    cursor: pointer;
    transition: border-color 0.1s, color 0.1s;
}

.bem-stepper-controls button:hover:not(:disabled) {
    border-color: var(--color-link, #4da6ff);
    color: var(--color-link, #4da6ff);
}

.bem-stepper-controls button:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.bem-stepper-controls .bem-step-counter {
    margin-left: auto;
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: var(--color-foreground-muted);
}

/* ── step panel ───────────────────────────────────────────────────────── */
.bem-stepper-panel {
    background: var(--color-background);
    border: 1px solid var(--color-background-border);
    border-radius: 4px;
    padding: 0.75rem 0.85rem 0.85rem;
}

.bem-stepper-panel > h5 {
    margin: 0 0 0.4rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.bem-stepper-panel .bem-step-text {
    margin: 0 0 0.65rem;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--color-foreground-secondary, var(--color-foreground));
}

/* ── equation block ───────────────────────────────────────────────────── */
.bem-stepper-eq-block {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin: 0 0 0.7rem;
    padding: 0.4rem 0.65rem;
    background: var(--color-background-secondary);
    border: 1px solid var(--color-background-border);
    border-left: 3px solid var(--color-link, #4da6ff);
    border-radius: 3px;
    overflow-x: auto;
}

.bem-eq-label {
    flex-shrink: 0;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-foreground-muted);
    white-space: nowrap;
}

.bem-stepper-eq-block code {
    font-size: 0.78rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: var(--color-foreground);
    white-space: pre;
}

/* ── SVG wrap ─────────────────────────────────────────────────────────── */
#bem-asm-svg-wrap,
#bem-mem-svg-wrap {
    /* height determined by SVG viewBox */
}

#bem-asm-svg-wrap svg,
#bem-mem-svg-wrap svg {
    display: block;
    width: 100%;
    height: auto;
    max-height: 300px;
    border-radius: 3px;
}

/* ── legacy: hide old canvas / pre elements if any remain ─────────────── */
.bem-stepper-panel canvas,
.bem-stepper-eq,
#bem-asm-panels,
#bem-mem-panels {
    display: none !important;
}

/* ── legend strip (unused but kept for compatibility) ─────────────────── */
.bem-stepper-legend {
    display: none;
}

.bem-swatch {
    display: inline-block;
    width: 0.65rem;
    height: 0.65rem;
    border-radius: 2px;
}