/* Layout and visualisation only; colour, type and buttons come from the site. */
.materials-intro { border-bottom: 0; padding-bottom: 34px; }
.materials-intro-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 48px; align-items: end; }
.materials-intro h1 { font-size: clamp(2.5rem, 4.7vw, 4.5rem); margin: 0; }
.materials-intro .lead { margin: 0; }
.materials-intro .intro-links { gap: 12px 22px; }
.materials-lab-section { padding-bottom: 52px; scroll-margin-top: 100px; }
.thermal-lab { padding: 32px; background: var(--ink); color: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); }
.thermal-lab .eyebrow, .thermal-lab .model-note { color: var(--card); opacity: .7; }
.lab-heading { display: flex; gap: 18px; justify-content: space-between; align-items: center; }
.lab-heading h2 { margin: 8px 0 0; font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
.lab-model-tag { font-size: .78rem; color: var(--accent-3); }
.lab-description { font-size: .94rem; margin: 12px 0 22px; }
.material-picker, .process-picker { display: flex; flex-wrap: wrap; gap: 8px; }
.material-picker button, .process-picker button, .lab-stage-picker button, .lab-reset { font: inherit; font-size: .85rem; color: inherit; background: transparent; cursor: pointer; border: 1px solid var(--stroke); border-radius: var(--radius-sm); padding: 11px 16px; }
.material-picker button { border-color: color-mix(in srgb, var(--card) 22%, transparent); }
.material-picker button span { margin-right: 10px; font-size: .7rem; opacity: .65; }
.material-picker button[aria-pressed="true"] { color: var(--ink); background: var(--accent-3); border-color: var(--accent-3); }
.material-picker button:hover:not([aria-pressed="true"]) { border-color: var(--accent-3); }
.lab-main { display: grid; grid-template-columns: minmax(0, 2.4fr) minmax(220px, 1fr); gap: 28px; margin: 24px 0; }
.lab-graph { min-width: 0; }
.lab-legend { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: .8rem; }
.lab-legend span { display: inline-flex; align-items: center; gap: 8px; }
.lab-legend .legend-time { margin-left: auto; opacity: .6; }
.lab-legend i { width: 20px; border-top: 3px solid; }
.key-chamber { color: var(--accent-3); border-top-style: dashed !important; }
.key-surface { color: var(--accent-2); }
.key-core { color: var(--accent); }
.heat-plot, .process-plot { display: block; width: 100%; height: auto; overflow: visible; font: inherit; }
.plot-grid { stroke: currentColor; opacity: .12; }
.plot-label { fill: currentColor; opacity: .7; font-size: 13px; }
.plot-path { fill: none; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.plot-chamber { stroke: var(--accent-3); stroke-dasharray: 7 5; stroke-width: 2; }
.plot-surface { stroke: var(--accent-2); }
.plot-core { stroke: var(--accent); stroke-width: 3.5; }
.plot-cursor { stroke: currentColor; opacity: .45; stroke-dasharray: 3 5; }
.plot-dot { fill: var(--accent); stroke: var(--ink); stroke-width: 2; }
.plot-hold-band { fill: var(--accent-3); opacity: .05; }
.lab-stage-picker { display: flex; gap: 6px; }
.lab-stage-picker button { border: 0; padding: 6px 12px; color: var(--card); opacity: .65; }
.lab-stage-picker button[aria-pressed="true"] { background: color-mix(in srgb, var(--card) 10%, transparent); opacity: 1; }
.lab-cross-section { border-left: 1px solid color-mix(in srgb, var(--card) 20%, transparent); padding-left: 28px; }
.slice-heading { display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between; align-items: center; font-size: .78rem; }
.slice-heading strong { color: var(--accent-3); font-weight: 500; }
.material-slice { display: block; width: 100%; margin: 12px 0 0; }
.kiln-outline { fill: none; stroke: var(--accent-3); stroke-dasharray: 4 5; opacity: .4; }
.heat-arrows { stroke: var(--accent-3); fill: none; }
.material-slice [data-layer] { fill: var(--bg-alt); }
.slice-marker { fill: none; stroke: var(--ink); stroke-dasharray: 3 3; }
.slice-dot { fill: var(--ink); }
.slice-readings { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 0; font-variant-numeric: tabular-nums; }
.slice-readings dt { font-size: .8rem; opacity: .7; }
.slice-readings dd { font-size: clamp(1.7rem, 2.5vw, 2.5rem); line-height: 1.2; margin: 4px 0 0; }
.slice-readings dd span { font-size: .9rem; }
.slice-readings div:first-child dd { color: var(--accent-3); }
.slice-readings div:last-child dd { color: var(--accent); }
.lab-observation { margin: 16px 0 0; font-size: .82rem; }
.lab-controls { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; border-top: 1px solid color-mix(in srgb, var(--card) 20%, transparent); padding-top: 22px; }
.lab-controls label { display: grid; gap: 8px; font-size: .8rem; }
.lab-controls label > span { display: flex; flex-direction: column; gap: 6px; }
.lab-controls output { font-size: 1.2rem; color: var(--accent-3); font-weight: 500; font-variant-numeric: tabular-nums; }
.lab-controls small { opacity: .6; font-size: .7rem; }
.thermal-lab input[type="range"] { accent-color: var(--accent-3); min-width: 0; }
.lab-playback { display: flex; align-items: center; gap: 18px; margin-top: 24px; }
.lab-playback .btn { background: var(--card); color: var(--ink); box-shadow: none; justify-content: center; min-width: 136px; }
.lab-time { display: flex; gap: 12px; align-items: center; flex: 1; min-width: 0; }
.lab-time output { font-variant-numeric: tabular-nums; font-size: .85rem; min-width: 50px; text-align: right; }
.lab-reset { border: 0; padding: 8px; }
.lab-result { margin: 18px 0 0; font-size: .85rem; }
.thermal-lab .model-note { font-size: .75rem; max-width: none; }
.cycle-principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin: 32px 0; }
.cycle-principles > div { border-top: 1px solid var(--stroke); padding-top: 18px; }
.cycle-principles span { display: block; font-size: 2.3rem; color: var(--accent); margin-bottom: 10px; line-height: 1; }
.cycle-principles h3 { font-size: 1.05rem; }
.cycle-principles p { font-size: .9rem; margin: 12px 0 0; }
.material-source { font-size: .82rem; color: var(--muted); }
.process-explorer { background: var(--card); padding: 24px; border: 1px solid var(--stroke); border-radius: var(--radius); margin-top: 28px; }
.process-picker button { padding: 9px 13px; font-size: .8rem; }
.process-picker [aria-pressed="true"] { background: var(--ink); color: var(--card); border-color: var(--ink); }
.process-heading { margin-top: 26px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.process-heading h3 { font-size: 1.1rem; margin: 0; }
.process-heading small { color: var(--muted); }
.process-plot { margin-top: 14px; }
.process-path { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.process-highlight { fill: var(--accent); opacity: .08; }
.process-stages { display: grid; gap: 8px; }
.process-stages button { display: flex; text-align: left; align-items: baseline; gap: 12px; font: inherit; font-size: .85rem; padding: 12px; color: var(--ink); background: transparent; border: 1px solid var(--stroke); border-radius: var(--radius-sm); cursor: pointer; }
.process-stages button > span { color: var(--muted); font-size: .72rem; }
.process-stages button[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, var(--card)); }
.process-explanation { font-size: .9rem; min-height: 3.2em; }
.process-source { display: inline-block; margin-top: 16px; font-size: .8rem; }
.process-reference { margin-top: 24px; font-size: .85rem; }
.process-reference summary { cursor: pointer; padding: 12px 0; font-weight: 500; }
.materials-article .control-footer nav { flex-wrap: wrap; }
@media (max-width: 900px) {
  .materials-intro-grid { grid-template-columns: 1fr; gap: 24px; }
  .materials-intro h1 { font-size: clamp(2.5rem, 7.2vw, 4.5rem); }
  .materials-intro .lead { max-width: 620px; }
  .lab-main { grid-template-columns: minmax(0, 2fr) minmax(180px, 1fr); gap: 18px; }
  .lab-cross-section { padding-left: 18px; }
  .lab-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 28px; }
}
@media (max-width: 620px) {
  .thermal-lab { padding: 22px 16px; }
  .lab-heading { align-items: start; flex-direction: column; gap: 10px; }
  .lab-heading .eyebrow { font-size: .72rem; }
  .lab-description { font-size: .85rem; }
  .material-picker { display: grid; grid-template-columns: 1fr 1fr; }
  .material-picker button { text-align: left; padding: 10px; font-size: .8rem; }
  .material-picker button span { margin-right: 6px; }
  .lab-main { grid-template-columns: 1fr; }
  .lab-cross-section { border-left: 0; border-top: 1px solid color-mix(in srgb, var(--card) 20%, transparent); padding: 18px 0 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
  .slice-heading { grid-column: 1 / -1; }
  .material-slice { margin: 0; }
  .slice-readings { align-content: center; gap: 8px; }
  .slice-readings dd { font-size: 1.5rem; }
  .slice-readings dd span { font-size: .7rem; }
  .lab-observation { grid-column: 1 / -1; margin: 0; }
  .lab-legend { font-size: .7rem; gap: 8px 12px; }
  .lab-legend .legend-time { margin-left: 0; }
  .lab-legend i { width: 14px; }
  .lab-controls { gap: 16px; }
  .lab-controls label > span { font-size: .75rem; }
  .lab-controls output { font-size: 1.1rem; }
  .lab-playback { flex-wrap: wrap; gap: 10px; }
  .lab-time { order: 3; flex-basis: 100%; }
  .lab-reset { margin-left: auto; }
  .lab-stage-picker button { font-size: .78rem; padding: 6px 9px; }
  .cycle-principles { grid-template-columns: 1fr; gap: 16px; }
  .cycle-principles > div { display: grid; grid-template-columns: 40px 1fr; gap: 0 14px; }
  .cycle-principles span { grid-row: 1 / 3; font-size: 2rem; }
  .cycle-principles h3 { margin: 0; }
  .cycle-principles p { margin-top: 6px; }
  .process-explorer { padding: 18px 12px; }
  .process-picker { display: grid; grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: no-preference) {
  .material-picker button, .process-picker button, .process-stages button { transition: background .18s var(--ease), border-color .18s var(--ease); }
}
@media print {
  .thermal-lab { background: var(--card); color: var(--ink); box-shadow: none; }
  .lab-controls, .lab-playback, .material-picker, .lab-stage-picker, .process-explorer { display: none; }
  .materials-intro-grid { display: block; }
  .process-reference > div { display: block; }
}