/* Lab: the catalogue of the models, and the page of one model. An
   instrument is the figure of a paper page with one control below it. The
   catalogue uses the topic rows of subpage.css. */

/* A card: a fixed frame of the model on the left, and the name, the text
   and the button on the right. */
.model-card {
  display: grid;
  grid-template-columns: minmax(0, 21rem) 1fr;
  gap: 2rem;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 2.2rem 0;
}

.model-card:first-of-type { border-top: 0; padding-top: 0; }

/* The preview needs a script, so CSS hides it without one. */
.model-preview { display: none; }

.js .model-preview {
  display: block;
  position: relative;
  height: 11.5rem;
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color 140ms ease;
}

.model-preview:hover { border-color: var(--accent); }

/* The box inside the preview is taller than the window, so the subject
   falls near the middle of the window. */
.model-preview-crop {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 30rem;
}

.model-card-head {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
}

.model-card-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.015em;
}

.model-card-body p {
  max-width: var(--w-prose);
  margin-top: 0.7rem;
  font-size: 0.98rem;
  color: var(--muted);
}

.model-card-body .model-meta {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* The papers a model comes from, with the round mark of the publications
   rail. */
.model-source {
  margin-top: 1.15rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

/* Two sources stand side by side. A narrow card puts them one below the
   other. */
.source-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(17rem, 100%), 1fr));
  gap: 0.9rem 1.6rem;
  margin-top: 0.75rem;
}

.source-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.model-source .source {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
}

.model-source .node-icon {
  margin-top: 0;
  width: 2rem;
  height: 2rem;
  transition: border-color 140ms ease;
}

.model-source .node-icon svg { width: 0.95rem; height: 0.95rem; }

.source-text { display: block; }

.source-where {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.source-where .dot { color: var(--line-strong); }

.source-name {
  display: block;
  margin-top: 0.1rem;
  font-size: 0.88rem;
  line-height: 1.35;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
  transition: color 140ms ease, text-decoration-color 140ms ease;
}

.source:hover .node-icon, .source:focus-visible .node-icon { border-color: var(--accent); }

.source:hover .source-name, .source:focus-visible .source-name {
  color: var(--accent-strong);
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
}

.model-card-body .pill {
  display: inline-flex;
  align-items: center;
  margin-top: 1.35rem;
}

@media (max-width: 860px) {
  .model-card { grid-template-columns: 1fr; gap: 1.2rem; }
  .js .model-preview { height: 10rem; }
}

.instrument {
  border-top: 1px solid var(--line);
  padding: 2.6rem 0 2.9rem;
}

.instrument:first-of-type { border-top: 0; padding-top: 0; }

/* The stage holds the canvas, and the engine sizes it to this box. It needs
   a script, so CSS hides it without one, and the notes below tell the
   subject. */
.instrument-stage { display: none; }

.js .instrument-stage { display: block; }

.instrument-stage {
  position: relative;
  margin-top: 1.4rem;
  height: clamp(250px, 34vw, 400px);
  border: 1px solid var(--line);
  overflow: hidden;
}

/* The script fills the control row. Without a script it takes no space. */
.lab-controls {
  margin-top: 1.05rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  font-family: var(--font-mono);
}

.lab-controls label {
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

.lab-controls input[type="range"] {
  flex: 1 1 11rem;
  max-width: 19rem;
  accent-color: var(--accent);
}

.lab-controls output {
  font-size: 0.78rem;
  color: var(--ink);
  min-width: 3.4rem;
  font-variant-numeric: tabular-nums;
}

/* Auto and Hold. The pressed button is the mode in use. */
.lab-modes { display: inline-flex; gap: 0.3rem; }

.lab-mode {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.32rem 0.85rem;
  cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease;
}

.lab-mode[aria-pressed="true"] {
  color: var(--accent-fill-ink);
  background: var(--accent-fill);
  border-color: var(--accent-fill);
}

/* What the model does at this moment, in the mono face of a label. */
.lab-status {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--muted);
  max-width: 44rem;
}

/* The page of one model. The stage is taller than the stage of a paper
   page: the height sets the size of the subject. */
.lab-model .instrument-stage { height: clamp(320px, 44vw, 560px); }

/* The notes below the model. Each note is one subject, and a line divides
   two of them. */
.model-note {
  border-top: 1px solid var(--line);
  padding: 2rem 0 0.4rem;
}

.model-note:first-child { border-top: 0; padding-top: 0; }

.model-note h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.model-note p {
  max-width: var(--w-prose);
  margin-top: 0.85rem;
  font-size: 0.99rem;
}

.model-note code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--muted);
}

/* The equations, in the box of a citation record. Each line is one equation
   in MathML, and a long line scrolls. */
.model-formula {
  max-width: 48rem;
  margin: 1rem 0 0;
  padding: 0.3rem 1.1rem;
  border: 1px solid var(--line);
  background: var(--surface);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.eq {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.6rem;
  padding: 0.65rem 0;
}

.eq + .eq { border-top: 1px solid color-mix(in srgb, var(--line) 55%, transparent); }

/* The equation keeps the width it needs. The label takes the rest, and
   wraps. */
.eq math {
  flex: 0 0 auto;
  font-size: 1.05rem;
  color: var(--ink);
  margin: 0;
  text-align: left;
}

.eq-label {
  flex: 1 1 auto;
  min-width: 8rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--muted);
  text-align: right;
}

@media (max-width: 720px) {
  .instrument { padding: 2rem 0 2.2rem; }
  .instrument-stage { height: clamp(220px, 52vw, 320px); }
  .lab-model .instrument-stage { height: clamp(280px, 68vw, 420px); }
  .model-note { padding: 1.6rem 0 0.4rem; }
  .model-formula { padding: 0.2rem 0.9rem; }
  .eq { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
  .eq-label { min-width: 0; text-align: left; }
}