/* One continuous diagram: the question remains in place as the explanation grows. */
.issue-tree-visual {
  --visual-ease: cubic-bezier(.22, 1, .36, 1);
  margin: 24px 0 40px;
  color: var(--ink, #202b38);
  font-family: var(--font-mono, monospace);
  font-size: 14px;
  line-height: 1.5;
}
.issue-tree-visual * { box-sizing: border-box; }
.issue-tree-visual button { font: inherit; color: inherit; cursor: pointer; }
.issue-tree-visual button:focus-visible, .issue-tree-visual summary:focus-visible, .issue-tree-visual textarea:focus-visible { outline: 2px solid var(--accent-ink); outline-offset: 4px; }
.issue-tree-visual button:disabled { cursor: default; }
.itv-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 24px; font-size: 11px; color: var(--muted); }
.itv-examples { display: flex; gap: 4px; padding: 3px; border: 1px solid var(--line-strong); border-radius: 6px; }
.itv-examples button { background: transparent; border: 0; border-radius: 3px; padding: 7px 10px; min-height: 36px; font-size: 11px; transition: background .2s, color .2s; }
.itv-examples button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.itv-steps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-block: 1px solid var(--line-strong); }
.itv-steps button { display: flex; align-items: center; gap: 10px; min-height: 62px; padding: 10px 8px; background: transparent; border: 0; border-bottom: 2px solid transparent; font-size: 13px; text-align: left; transition: color .25s, border-color .3s; }
.itv-steps button[aria-pressed="true"] { border-bottom-color: var(--accent-ink); color: var(--accent-ink); }
.itv-step-number { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--line-strong); border-radius: 50%; font-size: 10px; flex-shrink: 0; transition: border-color .3s, background .3s, color .3s; }
.itv-steps button[aria-pressed="true"] .itv-step-number { background: var(--accent-ink); border-color: var(--accent-ink); color: var(--bg); }
.itv-steps .is-done .itv-step-number { border-color: var(--ink); }
.itv-heading { min-height: 110px; padding: 24px 0 14px; }
.issue-tree-visual .itv-heading h2 { margin: 0 0 9px; font-size: clamp(20px, 2.7vw, 25px); font-weight: 500; letter-spacing: -.035em; line-height: 1.25; }
.itv-heading > p { margin: 0; color: var(--muted); font-size: 13px; max-width: 64ch; }
.itv-scene { position: relative; height: 382px; isolation: isolate; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--paper, #fcfaf5); overflow: hidden; }
.itv-grid { position: absolute; inset: 0; z-index: -1; opacity: .25; background-image: radial-gradient(var(--muted) .7px, transparent .7px); background-size: 20px 20px; mask-image: linear-gradient(transparent,#000 20%,#000 80%,transparent); }
.itv-root { position: absolute; top: 30px; left: 50%; width: min(420px, calc(100% - 42px)); height: 102px; display: flex; flex-direction: column; justify-content: center; padding: 17px 24px; border: 1px solid var(--ink); border-radius: 7px; background: var(--ink); color: var(--bg); text-align: center; transform: translate(-50%,0); transition: transform .7s var(--visual-ease), box-shadow .7s var(--visual-ease); box-shadow: 0 4px 0 #1824310a; z-index: 2; }
.itv-root > span { font-size: 9px; letter-spacing: .16em; opacity: .72; }
.issue-tree-visual .itv-root p { color: inherit; margin: 9px 0 0; font-size: clamp(15px,2.2vw,19px); line-height: 1.35; text-wrap: balance; }
.itv-root i { position: absolute; bottom: -4px; left: calc(50% - 3px); width: 6px; height: 6px; background: var(--accent-ink); border-radius: 50%; transition: opacity .4s; }
[data-stage="0"] .itv-root { transform: translate(-50%,140px); box-shadow: 0 12px 24px #1824310c; }
[data-stage="0"] .itv-root i { opacity: 0; }
.itv-rough { position: absolute; top: 46px; left: 12px; right: 12px; text-align: center; opacity: 0; transform: translateY(-12px); transition: opacity .25s, transform .4s var(--visual-ease); pointer-events: none; }
.itv-rough > span { font-size: 10px; color: var(--muted); }
.itv-rough p { font-size: 16px; margin: 8px 0; color: var(--muted); }
.itv-rough svg { width: 20px; height: 32px; stroke: var(--accent-ink); stroke-width: 1.2; fill: none; }
[data-stage="0"] .itv-rough { opacity: 1; transform: translateY(0); transition-delay: .15s; }
.itv-connectors { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.itv-connectors path { fill: none; stroke: var(--ink); stroke-width: 1.25; opacity: .35; stroke-dasharray: 1; stroke-dashoffset: 0; transition: stroke-dashoffset .85s var(--visual-ease), opacity .45s, stroke .35s, stroke-width .35s; }
[data-stage="0"] .itv-connectors path { stroke-dashoffset: 1; opacity: 0; }
[data-stage="2"] .itv-connectors path { opacity: .14; }
[data-stage="2"] .itv-connectors path.is-selected { opacity: 1; stroke: var(--accent-ink); stroke-width: 2; }
.itv-branches { position: absolute; left: 20px; right: 20px; top: 226px; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 12px; }
.issue-tree-visual .itv-branch { position: relative; display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-start; min-width: 0; min-height: 86px; padding: 13px 12px; border: 1px solid var(--line-strong); border-radius: 6px; background: var(--bg); color: var(--ink); text-align: left; opacity: 1; transform: translateY(0); visibility: visible; transition: transform .6s var(--visual-ease), opacity .4s, visibility .4s, background .3s, border-color .3s, box-shadow .3s; transition-delay: calc(var(--branch-index) * 45ms); }
.itv-branch-number { font-size: 9px; color: var(--muted); margin-bottom: 9px; }
.issue-tree-visual .itv-branch strong { color: inherit; font-weight: 500; font-size: 12px; line-height: 1.3; }
.itv-branch-arrow { position: absolute; right: 10px; top: 10px; font-size: 12px; opacity: .6; }
[data-stage="0"] .itv-branch { opacity: 0; transform: translateY(-22px); visibility: hidden; transition-delay: 0s; }
.issue-tree-visual .itv-branch:not(:disabled):hover { transform: translateY(-4px); border-color: var(--accent-ink); box-shadow: 0 5px 12px #18243109; transition-delay: 0s; }
.issue-tree-visual .itv-branch[aria-pressed="true"] { border-color: var(--accent-ink); box-shadow: 0 0 0 1px var(--accent-ink); background: var(--ink); color: var(--bg); transform: translateY(-4px); transition-delay: 0s; }
.itv-branch[aria-pressed="true"] .itv-branch-number { color: var(--bg); opacity: .75; }
.itv-scene-note { position: absolute; bottom: 17px; left: 24px; right: 24px; text-align: center; margin: 0; font-size: 11px; color: var(--muted); line-height: 1.5; }
.itv-reading { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows .55s var(--visual-ease), opacity .45s; }
.itv-reading > div { overflow: hidden; min-height: 0; }
[data-stage="2"] .itv-reading { grid-template-rows: 1fr; opacity: 1; }
.itv-reading-question { margin: 24px 0 14px; font-size: 16px; letter-spacing: -.025em; }
.itv-evidence { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; padding: 0 0 24px; border-bottom: 1px solid var(--line-strong); }
.itv-evidence > div { padding-left: 12px; border-left: 2px solid var(--line-strong); }
.itv-evidence > div:first-child { border-color: var(--accent-ink); }
.itv-evidence span { font-size: 9px; letter-spacing: .1em; color: var(--muted); }
.itv-evidence p { font-size: 12px; margin: 7px 0 0; }
.itv-controls { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 16px; }
.itv-controls button { border: 0; background: transparent; min-height: 44px; padding: 9px 4px; font-size: 12px; }
.itv-controls button:disabled { opacity: .4; }
.itv-controls > span { font-size: 10px; color: var(--muted); font-variant-numeric: tabular-nums; }
.itv-controls .itv-next { color: var(--accent-ink); }
.itv-next span { display: inline-block; margin-left: 6px; transition: transform .25s var(--visual-ease); }
.itv-next:hover span { transform: translateX(4px); }
.itv-prompt { margin-top: 25px; padding: 20px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--paper); }
.itv-prompt-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.issue-tree-visual .itv-prompt h3 { margin: 0; font: 500 16px/1.4 var(--font-mono); letter-spacing: -.025em; }
.itv-prompt-help { margin: 12px 0 0; color: var(--muted); font-size: 12px; max-width: 65ch; }
.itv-prompt textarea { display: block; width: 100%; margin: 16px 0 0; padding: 14px; resize: vertical; min-height: 180px; background: var(--bg); border: 1px solid var(--line-strong); border-radius: 5px; color: var(--ink); font: 12px/1.6 var(--font-mono); }
.itv-prompt button { flex-shrink: 0; padding: 8px 12px; min-height: 44px; border: 1px solid var(--ink); background: var(--ink); color: var(--bg); border-radius: 4px; font-size: 12px; }
.itv-prompt button:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.itv-prompt [data-copy-status] { display: block; min-height: 17px; color: var(--muted); font-size: 11px; margin-top: 8px; }
@media (max-width: 540px) {
  .itv-toolbar { align-items: flex-start; gap: 8px; }
  .itv-toolbar > span { max-width: 75px; padding-top: 7px; }
  .itv-examples button { padding-inline: 8px; }
  .itv-steps button { gap: 6px; padding-inline: 2px; font-size: 11px; min-height: 56px; }
  .itv-step-number { width: 22px; height: 22px; font-size: 9px; }
  .itv-heading { min-height: 127px; padding-top: 22px; }
  .itv-scene { height: 456px; }
  .itv-root { top: 28px; height: 104px; padding-inline: 15px; width: calc(100% - 36px); }
  [data-stage="0"] .itv-root { transform: translate(-50%,144px); }
  .itv-rough { top: 52px; }
  .itv-branches { top: 199px; left: 17px; right: 17px; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px 18px; }
  .issue-tree-visual .itv-branch { min-height: 81px; }
  .itv-scene-note { bottom: 17px; left: 16px; right: 16px; font-size: 10px; }
  .itv-evidence { grid-template-columns: 1fr; gap: 13px; }
  .itv-evidence > div { display: grid; grid-template-columns: 82px 1fr; gap: 12px; }
  .itv-evidence span { padding-top: 2px; }
  .itv-evidence p { margin: 0; }
  .itv-prompt textarea { font-size: 16px; }
  .itv-prompt { padding: 16px; }
  .itv-prompt-heading { align-items: flex-start; flex-direction: column; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .issue-tree-visual *, .issue-tree-visual *::before, .issue-tree-visual *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media print {
  .itv-controls, .itv-toolbar, .itv-prompt { display: none; }
  .itv-reading { grid-template-rows: 1fr; opacity: 1; }
}
@media (max-width: 370px) {
  .itv-steps button { flex-direction: column; align-items: flex-start; justify-content: center; gap: 5px; min-height: 72px; padding-left: 6px; }
}