/* Styles for the published Capability Pipeline cases activity. */

  :root {
    --bg: #f1f3ee;
    --surface: #ffffff;
    --surface-2: #e7eae1;
    --ink: #182420;
    --ink-muted: #55645c;
    --border: #cfd6c8;
    --accent: #1c6e66;
    --accent-soft: #dceae7;
    --accent-ink: #ffffff;
    --branch: #a3650f;
    --branch-soft: #f3e2c9;
    --danger: #93321f;
    --danger-soft: #f2ddd6;
    --good: #386b45;
    --good-soft: #dbe9dc;
    --font-display: "IBM Plex Serif", Georgia, serif;
    --font-body: "IBM Plex Sans", -apple-system, sans-serif;
    --font-mono: "IBM Plex Mono", "SFMono-Regular", monospace;
    color-scheme: light;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #101614;
      --surface: #182220;
      --surface-2: #1f2b28;
      --ink: #eaf0ec;
      --ink-muted: #a3b1a9;
      --border: #2c3934;
      --accent: #57c2b4;
      --accent-soft: #1c3532;
      --accent-ink: #08231f;
      --branch: #e0a24d;
      --branch-soft: #3a2d18;
      --danger: #e28268;
      --danger-soft: #3a2420;
      --good: #7fc48d;
      --good-soft: #203327;
      color-scheme: dark;
    }
  }
  :root[data-theme="dark"] {
    --bg: #101614;
    --surface: #182220;
    --surface-2: #1f2b28;
    --ink: #eaf0ec;
    --ink-muted: #a3b1a9;
    --border: #2c3934;
    --accent: #57c2b4;
    --accent-soft: #1c3532;
    --accent-ink: #08231f;
    --branch: #e0a24d;
    --branch-soft: #3a2d18;
    --danger: #e28268;
    --danger-soft: #3a2420;
    --good: #7fc48d;
    --good-soft: #203327;
    color-scheme: dark;
  }

  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.55;
    padding-inline: 20px;
  }
  .wrap { max-width: 980px; margin: 0 auto; }

  a { color: var(--accent); }

  .draft-banner {
    max-width: 980px;
    margin: 16px auto 0;
    padding: 10px 16px;
    background: var(--branch-soft);
    border: 1px solid var(--branch);
    color: var(--ink);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.01em;
    display: flex;
    gap: 8px;
    align-items: baseline;
    flex-wrap: wrap;
  }
  .draft-banner b { color: var(--branch); }

  header.hero { padding-block: 40px 24px; }
  .eyebrow {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 10px;
  }
  h1 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 4.2vw, 3rem);
    line-height: 1.05;
    margin: 0 0 16px;
    text-wrap: balance;
    letter-spacing: -0.01em;
  }
  .lede {
    font-size: 1.05rem;
    color: var(--ink-muted);
    max-width: 65ch;
    margin: 0;
  }
  .lede strong { color: var(--ink); font-weight: 600; }

  h2 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.5rem;
    margin: 0 0 6px;
    text-wrap: balance;
  }
  .section-sub {
    color: var(--ink-muted);
    max-width: 62ch;
    margin: 0 0 22px;
  }
  section { padding-block: 36px; border-top: 1px solid var(--border); }

  /* --- diagram --- */
  .diagram-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: clamp(16px, 3vw, 32px);
    display: grid;
    gap: 24px;
  }
  figure { margin: 0; min-width: 0; }
  .diagram-viewport { overflow-x: auto; border-radius: 12px; }
  .diagram-viewport:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
  @media (max-width: 600px) { .diagram-svg { min-width: 580px; } }
  .diagram-svg { width: 100%; height: auto; display: block; max-width: 720px; margin: 0 auto; }
  figcaption { margin: 12px auto 0; max-width: 60ch; font-size: 14px; color: var(--ink-muted); text-align: center; }
  figcaption span { display: block; margin: .3rem 0 1rem; }
  .return-caption { color: var(--accent); }
  .adoption-caption { color: #7352be; }
  .cycle-backdrop { fill: color-mix(in srgb, var(--accent) 5%, var(--surface)); }
  .cycle-guide { fill: none; stroke: var(--border); stroke-width: 1; }
  .step-node { --node-color: #285cca; }
  .step-node[data-pair="create"] { --node-color: #7950b7; }
  .step-node[data-pair="operate"] { --node-color: #137f78; }
  .step-node[data-pair="learn"] { --node-color: #b65e19; }
  .step-node circle { fill: var(--node-color); stroke: var(--surface); stroke-width: 4; }
  .step-node .num { font-family: var(--font-body); font-size: 19px; fill: #fff; font-weight: 700; }
  .step-node .lbl { font-family: var(--font-body); font-size: 16px; fill: var(--ink); font-weight: 650; }
  .loop-arrow { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-dasharray: 1 7; stroke-linecap: round; }
  .adoption-arrow { fill: none; stroke: #8862c7; stroke-width: 2.5; stroke-dasharray: 1 7; stroke-linecap: round; }
  .adoption-arrowhead { fill: #8862c7; }
  .adoption-node rect { fill: color-mix(in srgb, #8862c7 10%, var(--surface)); stroke: #8862c7; stroke-width: 1.8; }
  .adoption-label { font-family: var(--font-body); font-size: 17px; font-weight: 650; fill: var(--ink); }
  .adoption-sub { font-family: var(--font-body); font-size: 10px; fill: var(--ink-muted); }
  .start-star { fill: #fff; }
  .center-label { font-family: var(--font-body); font-size: 17px; font-weight: 650; fill: var(--ink-muted); }
  .flow-arrow { stroke: var(--ink-muted); stroke-width: 1.6; opacity: 0.7; }
  @media (prefers-color-scheme: dark) { .adoption-caption { color: #c3a6f0; } }

  .step-legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2px;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: var(--border);
  }
  .step-legend .item {
    background: var(--surface);
    padding: 12px 14px;
    display: flex;
    gap: 10px;
  }
  .step-legend .n {
    font-family: var(--font-mono);
    color: var(--accent);
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
  }
  .step-legend .t { font-size: 13.5px; }
  .step-legend .t b { display: block; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); margin-bottom: 2px; }
  .step-legend .t span { color: var(--ink-muted); }

  .callout {
    border-left: 3px solid var(--accent);
    background: var(--accent-soft);
    padding: 14px 18px;
    border-radius: 0 8px 8px 0;
    font-size: 14.5px;
  }
  .callout p { margin: 0 0 8px; }
  .callout p:last-child { margin-bottom: 0; }

  /* --- case picker --- */
  .case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 14px;
  }
  .case-card {
    text-align: left;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    font: inherit;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color .15s, transform .15s;
  }
  .case-card:hover { border-color: var(--accent); }
  .case-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .case-card.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
  .tagrow { display: flex; gap: 6px; flex-wrap: wrap; }
  .tag {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--ink-muted);
  }
  .tag.outcome-good { background: var(--good-soft); color: var(--good); }
  .tag.outcome-danger { background: var(--danger-soft); color: var(--danger); }
  .tag.outcome-branch { background: var(--branch-soft); color: var(--branch); }
  .case-card h3 { font-family: var(--font-display); font-size: 1.15rem; margin: 0; }
  .case-card .frame { font-size: 13px; color: var(--ink-muted); margin: 0; }

  /* --- pipeline explorer --- */
  .explorer { margin-top: 28px; display: none; }
  .explorer.visible { display: block; }
  .explorer-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
  .explorer-head h3 { font-family: var(--font-display); font-size: 1.4rem; margin: 0 0 4px; }
  .explorer-head .frame { color: var(--ink-muted); margin: 0; max-width: 55ch; }

  /* --- mode selector --- */
  .mode-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    padding: 12px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
  }
  .mode-bar .mode-label {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ink-muted);
    flex-shrink: 0;
  }
  .mode-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
  }
  .mode-toggle button {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.01em;
    padding: 7px 13px;
    border: none;
    border-right: 1px solid var(--border);
    background: var(--surface);
    color: var(--ink-muted);
    cursor: pointer;
  }
  .mode-toggle button:last-child { border-right: none; }
  .mode-toggle button.active { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
  .mode-desc { font-size: 12.5px; color: var(--ink-muted); flex-basis: 100%; margin: 0; }

  .stepper {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: var(--surface);
  }
  .step-row {
    display: grid;
    grid-template-columns: 44px 1fr auto;
    gap: 14px;
    align-items: start;
    padding: 14px 16px;
    border-top: 1px solid var(--border);
    cursor: pointer;
    background: var(--surface);
  }
  .step-row:first-child { border-top: none; }
  .step-row:hover { background: var(--surface-2); }
  .step-row .idx {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
    padding-top: 2px;
  }
  .step-row .body h4 {
    margin: 0 0 4px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }
  .step-row .body p.summary { margin: 0; color: var(--ink-muted); font-size: 13.5px; }
  .step-row .chev { font-family: var(--font-mono); color: var(--ink-muted); padding-top: 2px; }
  .step-row.branch-row .idx { color: var(--branch); }
  .step-row.branch-row { background: var(--branch-soft); }
  .step-row.branch-row:hover { filter: brightness(0.98); }
  .fork-badge {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: var(--branch);
    color: var(--surface);
    padding: 2px 7px;
    border-radius: 999px;
    margin-left: 8px;
    vertical-align: middle;
  }
  .fork-badge.correct { background: var(--good); }
  .fork-badge.incorrect { background: var(--danger); }

  .step-row.locked { cursor: not-allowed; opacity: 0.5; }
  .step-row.locked:hover { background: var(--surface); }
  .lock-icon { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); }

  .step-detail {
    display: none;
    padding: 0 16px 18px;
    border-top: 1px solid var(--border);
    background: var(--surface);
  }
  .step-detail.open { display: block; }
  .step-detail .full { padding-top: 14px; font-size: 14.5px; max-width: 68ch; }

  .branch-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
    margin: 14px 0 16px;
  }
  .branch-toggle button {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.02em;
    padding: 7px 14px;
    border: none;
    background: var(--surface);
    color: var(--ink-muted);
    cursor: pointer;
  }
  .branch-toggle button.active.real { background: var(--good-soft); color: var(--good); font-weight: 600; }
  .branch-toggle button.active.alt { background: var(--branch-soft); color: var(--branch); font-weight: 600; }

  .branch-panel {
    border: 1px dashed var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    font-size: 14.5px;
    max-width: 68ch;
  }
  .branch-panel.real { border-color: var(--good); background: var(--good-soft); }
  .branch-panel.alt { border-color: var(--branch); background: var(--branch-soft); border-style: dashed; }
  .branch-panel .kicker {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 8px;
  }
  .branch-panel.real .kicker { color: var(--good); }
  .branch-panel.alt .kicker { color: var(--branch); }
  .branch-panel p { margin: 0 0 8px; }
  .branch-panel p:last-child { margin-bottom: 0; }
  .branch-why { margin-top: 12px; font-size: 13px; color: var(--ink-muted); max-width: 68ch; }

  /* --- find-the-turn picker --- */
  .find-picker {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--surface-2);
  }
  .find-picker p { margin: 0 0 10px; font-size: 13.5px; }
  .find-picker .choices { display: flex; flex-wrap: wrap; gap: 6px; }
  .find-picker button {
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 6px 11px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--ink);
    cursor: pointer;
  }
  .find-picker button:hover { border-color: var(--accent); }
  .find-picker button.chosen-correct { background: var(--good-soft); border-color: var(--good); color: var(--good); font-weight: 600; }
  .find-picker button.chosen-incorrect { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); font-weight: 600; }
  .find-picker .result { margin-top: 10px; font-size: 13px; }
  .find-picker button:disabled { cursor: default; opacity: 0.85; }

  /* --- predict-first panel --- */
  .predict-panel {
    padding: 16px;
    background: var(--surface-2);
  }
  .predict-panel p.prompt { margin: 0 0 10px; font-size: 14.5px; }
  .predict-panel textarea {
    width: 100%;
    min-height: 70px;
    font: inherit;
    font-size: 13.5px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--ink);
    resize: vertical;
  }
  .predict-panel .reveal-btn {
    margin-top: 10px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: var(--accent-ink);
    cursor: pointer;
  }
  .predict-panel .reveal-btn:hover { filter: brightness(1.05); }
  .predict-note { margin-top: 10px; font-size: 12.5px; color: var(--ink-muted); }

  footer {
    padding-block: 30px 50px;
    color: var(--ink-muted);
    font-size: 12.5px;
    border-top: 1px solid var(--border);
  }
  footer p { max-width: 70ch; }

  @media (max-width: 640px) {
    .step-row { grid-template-columns: 32px 1fr auto; padding: 12px; }
  }
.return-caption { display:block; margin:12px 0 8px; color:var(--accent); font-family:var(--font-body); font-size:18px; font-weight:700; line-height:1.4; }

.teaching-point{border-left:4px solid var(--accent,#1c6e66);background:#f1f5ee;padding:1rem 1.1rem;margin:1rem 0;line-height:1.6}.teaching-point h4{margin:0 0 .65rem}.teaching-point p{margin:.55rem 0}.teaching-before{padding:.75rem;background:#f1f5ee;border-radius:5px}.turn-teaching{background:#f5f1e7}