.page-flow .hero .eyebrow {
    margin-bottom: 12px;
    font-size: 0.8rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.page-flow main > section > p,
.page-flow main > section > ul,
.page-flow main > section > ol {
    max-width: 85ch;
}

.page-flow li + li { margin-top: 10px; }

.page-flow details {
    margin: 14px 0;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.page-flow summary { cursor: pointer; }
.page-flow summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.page-flow details p:last-child { margin-bottom: 0; }
.page-flow .formula-card { min-width: 0; }
.page-flow .formula-card .math-block { margin: 10px 0 16px; padding: 10px 0; border: 0; }

.flow-lab {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.flow-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 16px;
    border-bottom: 1px solid var(--line);
}

.flow-controls[hidden] { display: none; }
.flow-controls button,
.flow-controls select {
    min-height: 44px;
    max-width: 100%;
    padding: 8px 12px;
    font: inherit;
    font-size: 0.9rem;
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 5px;
    background: var(--panel);
}

.flow-controls button { cursor: pointer; }
.flow-controls button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.flow-controls button:disabled { opacity: 0.45; cursor: default; }
.flow-controls :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.flow-lab figure { margin: 0; padding: 10px 16px 18px; }
.flow-canvas { overflow-x: auto; }
.flow-canvas:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.flow-canvas svg { display: block; width: 100%; min-width: 430px; max-width: 720px; margin: auto; }
.flow-lab figcaption { color: var(--muted); font-size: 0.87rem; }
.flow-edge { fill: none; stroke: var(--muted); stroke-width: 2; }
.flow-edge.is-active { stroke: var(--accent); stroke-width: 3.5; }
.flow-reverse { fill: none; stroke: var(--accent); stroke-width: 3.5; stroke-dasharray: 7 4; }
.flow-label { fill: var(--text); font-size: 17px; text-anchor: middle; paint-order: stroke; stroke: var(--panel); stroke-width: 6px; stroke-linejoin: round; }
.flow-node circle { fill: var(--panel); stroke: var(--muted); stroke-width: 1.5; }
.flow-node text { fill: var(--text); text-anchor: middle; font-size: 21px; font-style: italic; }
.flow-node.is-cut circle { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 4; }
.flow-status { padding: 16px; border-top: 1px solid var(--line); background: var(--panel-alt); }
.flow-status strong { font-size: 1.4rem; color: var(--accent); }
.flow-status p { margin: 8px 0 0; }
.page-flow .flow-table { min-width: 450px; }
.page-flow .flow-table tbody th { text-transform: none; }
.page-flow caption { padding: 12px; text-align: left; color: var(--muted); font-size: 0.9rem; }
.flow-code { padding: 18px; overflow-x: auto; background: var(--code); border: 1px solid var(--line); font-size: 0.85rem; line-height: 1.7; }
.flow-reading { color: var(--muted); font-size: 0.9rem; }

@media (max-width: 480px) {
    .page-flow .formula-grid { grid-template-columns: minmax(0, 1fr); }
    .flow-controls { gap: 8px; padding: 12px; }
    .flow-controls label { width: 100%; }
}