/* LESSON FIGURES — see ../lesson-figures.js. Theme tokens only (variables.css):
   a raw colour here is the white-on-white bug in light mode. */

.dd-figure {
  margin: 14px 0 18px;
  padding: 12px 14px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgb(var(--well-rgb) / calc(0.12 * var(--well-k)));
  max-width: 560px;
}
.dd-figure svg {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
  cursor: crosshair;
  user-select: none;
  border-radius: 6px;
}
.dd-figure svg:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.dd-figure figcaption {
  margin-top: 8px;
  font-size: 0.82em;
  color: var(--muted);
  line-height: 1.4;
}

/* Vertex inks: one colour per vertex, used for its dot, its label, its
   weight row and the arrow that walks toward it. */
.dd-figure-bary .ink-a { color: var(--info); fill: var(--info); }
.dd-figure-bary .ink-b { color: var(--warn); fill: var(--warn); }
.dd-figure-bary .ink-c { color: var(--accent-2); fill: var(--accent-2); }

.dd-figure-bary .para {
  fill: rgb(var(--tint-rgb) / calc(0.03 * var(--tint-k)));
  stroke: var(--muted-dim);
  stroke-width: 1.2;
  stroke-dasharray: 5 5;
}
.dd-figure-bary .para-label { fill: var(--muted-dim); font-size: 11px; }
.dd-figure-bary .tri {
  fill: rgb(var(--ok-rgb) / 0.13);
  stroke: var(--ok);
  stroke-width: 2;
  stroke-linejoin: round;
  transition: fill 0.15s;
}
.dd-figure-bary.is-outside .tri { fill: rgb(var(--ok-rgb) / 0.06); }
.dd-figure-bary .edge-label { fill: var(--muted); font-size: 12px; font-style: italic; }
.dd-figure-bary .vtx { stroke: var(--bg); stroke-width: 2; }
.dd-figure-bary .vtx-label { font-size: 15px; font-weight: 700; }
.dd-figure-bary .leg { stroke-width: 2.5; stroke-linecap: round; }
.dd-figure-bary .leg-u { stroke: var(--warn); }
.dd-figure-bary .leg-v { stroke: var(--accent-2); }
.dd-figure-bary .pt {
  fill: var(--white);
  stroke: var(--ok);
  stroke-width: 3;
  transition: stroke 0.15s;
}
.dd-figure-bary.is-outside .pt { stroke: var(--danger); }
.dd-figure-bary .pt-label { fill: var(--white); font-size: 14px; font-weight: 700; }

/* Readout */
.dd-bary-read { margin-top: 10px; font-size: 0.92em; }
.dd-bary-uv { display: flex; gap: 18px; margin-bottom: 6px; color: var(--muted); }
.dd-bary-uv b { color: var(--text); font-variant-numeric: tabular-nums; }
.dd-bary-weights { display: grid; gap: 4px; }
.dd-bary-w {
  display: grid;
  grid-template-columns: 1.4em 1fr 3.6em;
  align-items: center;
  gap: 8px;
}
.dd-bary-name { font-weight: 700; }
.dd-bary-bar {
  position: relative;
  height: 8px;
  border-radius: 4px;
  background: rgb(var(--tint-rgb) / calc(0.07 * var(--tint-k)));
}
/* The zero line the bars grow from. */
.dd-bary-bar::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -2px;
  bottom: -2px;
  width: 1px;
  background: var(--muted-dim);
}
.dd-bary-fill {
  position: absolute;
  top: 0;
  bottom: 0;
  border-radius: 4px;
  background: currentColor;
  transition: width 0.08s, left 0.08s;
}
.dd-bary-w[data-w="a"] .dd-bary-fill { color: var(--info); }
.dd-bary-w[data-w="b"] .dd-bary-fill { color: var(--warn); }
.dd-bary-w[data-w="c"] .dd-bary-fill { color: var(--accent-2); }
.dd-bary-w.neg .dd-bary-fill { color: var(--danger); }
.dd-bary-num { text-align: right; font-variant-numeric: tabular-nums; color: var(--text); }
.dd-bary-w.neg .dd-bary-num { color: var(--danger); }
.dd-bary-sum {
  margin-top: 8px;
  font-family: var(--mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.88em;
  color: var(--muted);
  white-space: pre-wrap;
}
.dd-bary-verdict {
  margin-top: 6px;
  padding: 6px 9px;
  border-radius: 6px;
  border-left: 3px solid var(--ok);
  background: rgb(var(--ok-rgb) / 0.08);
  color: var(--text);
  line-height: 1.4;
}
.dd-figure-bary.is-outside .dd-bary-verdict {
  border-left-color: var(--danger);
  background: rgb(var(--danger-rgb) / 0.08);
}

.dd-bary-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.dd-bary-presets button {
  font: inherit;
  font-size: 0.8em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgb(var(--tint-rgb) / calc(0.04 * var(--tint-k)));
  color: var(--text);
  cursor: pointer;
}
.dd-bary-presets button:hover { border-color: var(--accent); }

/* ---- `independence` (../lesson-figure-independence.js) ------------------
   Edge B − A fixed, C dragged. Green triangle while the edges are
   independent; it collapses to a red segment on the dashed span line when
   they are not. */
.dd-figure-indep .ink-1 { color: var(--warn); fill: var(--warn); }
.dd-figure-indep .ink-2 { color: var(--accent-2); fill: var(--accent-2); }
.dd-figure-indep .span-line {
  stroke: var(--muted-dim);
  stroke-width: 1.2;
  stroke-dasharray: 3 5;
}
.dd-figure-indep .span-label { fill: var(--muted-dim); font-size: 11px; font-style: italic; }
.dd-figure-indep .para {
  fill: rgb(var(--tint-rgb) / calc(0.04 * var(--tint-k)));
  stroke: var(--muted-dim);
  stroke-width: 1.2;
  stroke-dasharray: 5 5;
}
.dd-figure-indep .tri {
  fill: rgb(var(--ok-rgb) / 0.16);
  stroke: var(--ok);
  stroke-width: 2;
  stroke-linejoin: round;
}
.dd-figure-indep.is-flat .tri { stroke: var(--danger); stroke-width: 3.5; }
.dd-figure-indep .leg { stroke-width: 2.5; stroke-linecap: round; }
.dd-figure-indep .leg-1 { stroke: var(--warn); }
.dd-figure-indep .leg-2 { stroke: var(--accent-2); }
.dd-figure-indep .leg-label { font-size: 12px; font-weight: 600; }
.dd-figure-indep .vtx { fill: var(--text); stroke: var(--bg); stroke-width: 2; }
.dd-figure-indep .vtx-label { fill: var(--text); font-size: 15px; font-weight: 700; }
.dd-figure-indep .pt { fill: var(--white); stroke: var(--accent-2); stroke-width: 3; cursor: grab; }
.dd-figure-indep.is-flat .pt { stroke: var(--danger); }
.dd-figure-indep .pt-label { fill: var(--white); font-size: 14px; font-weight: 700; }

.dd-indep-angle {
  display: grid;
  grid-template-columns: auto 1fr 3em;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  font-size: 0.88em;
  color: var(--muted);
}
.dd-indep-angle input { width: 100%; accent-color: var(--accent); }
.dd-indep-deg { text-align: right; color: var(--text); font-variant-numeric: tabular-nums; }
.dd-indep-read { margin-top: 8px; }
/* The three number lines are monospace so the digits line up; the verdict
   under them is a sentence and reads in the page font. */
.dd-indep-edges,
.dd-indep-cross,
.dd-indep-area {
  font-family: var(--mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.84em;
  color: var(--muted);
  line-height: 1.6;
  white-space: pre-wrap;
}
.dd-indep-verdict {
  margin-top: 6px;
  padding: 6px 9px;
  border-radius: 6px;
  border-left: 3px solid var(--ok);
  background: rgb(var(--ok-rgb) / 0.08);
  color: var(--text);
  font-size: 0.92em;
  line-height: 1.4;
}
.dd-figure-indep.is-flat .dd-indep-verdict {
  border-left-color: var(--danger);
  background: rgb(var(--danger-rgb) / 0.08);
}
@media (max-width: 520px) {
  .dd-indep-angle { grid-template-columns: 1fr 3em; }
  .dd-indep-angle span { grid-column: 1 / -1; }
}

/* ---- `einops-pool-1d` / `einops-pool-2d` (../lesson-figure-einops-pool.js) --
   Numbers are absolutely placed divs that slide between the three stages
   (tensor → rearrange → reduce). One ink per window, cycled .w0–.w5. */
.dd-figure-pool { max-width: 640px; }
.dd-pool-ctls { display: grid; gap: 6px; margin-bottom: 8px; }
.dd-pool-ctl { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; font-size: 0.82em; }
.dd-pool-ctl-label { min-width: 9.5em; color: var(--muted); }
.dd-pool-ctl button,
.dd-pool-stages button {
  font: inherit;
  font-family: var(--code-font, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.95em;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgb(var(--tint-rgb) / calc(0.04 * var(--tint-k)));
  color: var(--text);
  cursor: pointer;
}
.dd-pool-ctl button:hover,
.dd-pool-stages button:hover { border-color: var(--accent); }
.dd-pool-ctl button[aria-pressed="true"],
.dd-pool-stages button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
/* A window size that does not divide the length: still clickable, to see why. */
.dd-pool-ctl button.bad { border-style: dashed; color: var(--muted-dim); }
.dd-pool-ctl button.bad[aria-pressed="true"] { background: var(--danger); border-color: var(--danger); color: var(--white); }

.dd-pool-stages { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 10px; font-size: 0.82em; }
.dd-pool-stages .dd-pool-play { margin-left: auto; }

.dd-pool-scroll { overflow-x: auto; overflow-y: hidden; padding: 4px 2px 6px; border-radius: 6px; }
.dd-pool-scroll:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.dd-pool-stage {
  position: relative;
  transition: width 0.45s, height 0.45s;
  font-family: var(--code-font, ui-monospace, SFMono-Regular, Menlo, monospace);
}
.dd-pool-stage > div {
  position: absolute;
  left: 0;
  top: 0;
  transition: transform 0.55s cubic-bezier(.22, .9, .28, 1), opacity 0.3s, background 0.2s;
}
.dd-pool-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1.5px solid var(--border-strong);
  background: rgb(var(--tint-rgb) / calc(0.05 * var(--tint-k)));
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  user-select: none;
}
.dd-pool-cell.w0 { border-color: var(--info);     background: rgb(var(--info-rgb) / 0.16); }
.dd-pool-cell.w1 { border-color: var(--warn);     background: rgb(var(--warn-rgb) / 0.16); }
.dd-pool-cell.w2 { border-color: var(--accent-2); background: rgb(var(--accent-2-rgb) / 0.16); }
.dd-pool-cell.w3 { border-color: var(--ok);       background: rgb(var(--ok-rgb) / 0.16); }
.dd-pool-cell.w4 { border-color: var(--accent);   background: rgb(var(--accent-rgb) / 0.16); }
.dd-pool-cell.w5 { border-color: var(--danger);   background: rgb(var(--danger-rgb) / 0.12); }
.dd-pool-cell.hot { box-shadow: 0 0 0 2.5px var(--text); }
.dd-pool-out { font-weight: 800; border-width: 2.5px; }
.dd-figure-pool.is-bad .dd-pool-cell { border-style: dashed; }

.dd-pool-under,
.dd-pool-rowlab,
.dd-pool-collab,
.dd-pool-blocklab { color: var(--muted); font-size: 11px; pointer-events: none; }
.dd-pool-under { text-align: center; }
.dd-pool-rowlab { display: flex; align-items: center; white-space: nowrap; }
.dd-pool-collab { text-align: center; white-space: pre; line-height: 1.2; }
.dd-pool-small { font-size: 10px; }
.dd-pool-blocklab { white-space: nowrap; font-weight: 600; }
.dd-pool-arrow { display: flex; align-items: center; color: var(--muted); font-size: 16px; pointer-events: none; }

.dd-pool-code {
  margin: 8px 0 0;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--panel-deep);
  color: var(--text);
  font-family: var(--code-font, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.8em;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
}
.dd-pool-say {
  margin-top: 6px;
  padding: 6px 9px;
  border-radius: 6px;
  border-left: 3px solid var(--accent);
  background: rgb(var(--accent-rgb) / 0.07);
  color: var(--text);
  font-size: 0.9em;
  line-height: 1.45;
}
.dd-figure-pool.is-bad .dd-pool-say { border-left-color: var(--danger); background: rgb(var(--danger-rgb) / 0.08); }
@media (prefers-reduced-motion: reduce) {
  .dd-pool-stage, .dd-pool-stage > div { transition-duration: 0.01ms !important; transition-delay: 0s !important; }
}