/* Material Lab. Built on lab-kit.css: the specimen and the inspector are two card-gray surfaces,
   readings float over the render as chips, and every choice is a pill. The frame stays in the gray
   wedge; colour lives in the render and the material swatches. */

.material-workspace { --height: clamp(560px, calc(100svh - 160px), 900px); display: grid; grid-template-columns: minmax(0, 1fr) 372px; align-items: start; gap: 16px; }
.material-guide-trigger { display:inline-flex; align-items:center; justify-content:center; gap:12px; min-height:40px; padding:8px 16px; border:1px solid var(--k3); border-radius:999px; background:var(--k1); color:var(--k9); font:400 14px/1.5 var(--f-ko); white-space:nowrap; }
.material-guide-trigger:hover { background:var(--k2); border-color:var(--k5); }
.material-guide-trigger span { display:grid; place-items:center; width:20px; height:20px; border:1px solid var(--k5); border-radius:50%; font:12px var(--f-mono); }

/* ---------- specimen ---------- */
.specimen-column { display: flex; flex-direction: column; min-width: 0; height: var(--height); padding: 12px; border-radius: var(--lk-radius); background: var(--k1); }
.material-stage { position: relative; order: 1; flex: 1; min-width: 0; min-height: 0; overflow: hidden; border-radius: var(--lk-radius-m); background: var(--k0); }
#canvas-container { position: absolute; inset: 0; }
#canvas-container canvas { display: block; width: 100%; height: 100%; touch-action: none; outline-offset: -4px; }
.stage-top { position: absolute; top: 16px; left: 16px; right: 16px; display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; pointer-events: none; }
.stage-top > span, .stage-bottom > span, .stage-info, .stage-bottom button, .loading {
  border-radius: 999px; background: rgb(0 0 0 / .72); color: var(--k8); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.stage-top > span { display: inline-block; padding: 4px 12px; border-radius: 14px; font: 12px/20px var(--f-mono); letter-spacing: .06em; }
.stage-top b { color: var(--k10); font-weight: 400; }
.stage-info { position: absolute; bottom: 68px; left: 16px; display: flex; gap: 24px; padding: 10px 16px; border-radius: var(--lk-radius-m); pointer-events: none; }
.stage-info > div { display: grid; gap: 2px; }
.reading-label { color: var(--k6); font: 12px var(--f-mono); letter-spacing: .08em; }
.stage-info output { color: var(--k10); font: 16px var(--f-mono); }
.stage-bottom { position: absolute; bottom: 16px; left: 16px; right: 16px; display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; pointer-events: none; }
.stage-bottom > span { display: inline-flex; align-items: center; min-height: 36px; padding: 4px 14px; font-size: 12px; line-height: 1.5; }
.stage-bottom button { min-height: 36px; padding: 0 14px; border: 0; color: var(--k9); font-size: 14px; white-space: nowrap; pointer-events: auto; }
.stage-bottom button:hover { background: var(--k2); color: var(--k10); }
.loading { position: absolute; top: 56px; right: 16px; padding: 6px 12px; font-size: 12px; }
.render-error { position: absolute; inset: 0; display: grid; place-content: center; padding: 32px; background: var(--k1); color: var(--k8); font-size: 14px; text-align: center; }

.specimen-controls { order: 2; display: grid; grid-template-columns: 1.15fr 1fr; align-items: end; gap: 16px; padding: 16px 8px 4px; }
.specimen-controls > div { min-width: 0; }
.field-label { display: block; margin-bottom: 8px; color: var(--k6); font-size: 14px; }
.specimen-controls select { width: 100%; }
.environment-control { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; column-gap: 16px; }
.environment-control .field-label { grid-column: 1 / -1; }
.background-choice { display: inline-flex; align-items: center; gap: 8px; color: var(--k6); font-size: 14px; white-space: nowrap; cursor: pointer; }
.background-choice:hover { color: var(--k10); }
.under-stage { display: flex; justify-content: space-between; gap: 20px; margin: 16px 4px 24px; color: var(--k5); font-size: 12px; }
.under-stage > span { font: 12px var(--f-mono); text-align: right; }

/* ---------- inspector ---------- */
.material-inspector { display: flex; flex-direction: column; min-width: 0; height: var(--height); overflow: hidden; border-radius: var(--lk-radius); background: var(--k1); }
.inspector-tabs { display: flex; flex-shrink: 0; gap: 2px; margin: 16px 16px 0; padding: 3px; border-radius: 999px; background: var(--k0); }
.inspector-tabs button { flex: 1; min-height: 36px; padding: 0 12px; border: 0; border-radius: 999px; background: transparent; color: var(--k6); font: 400 14px var(--f-ko); }
.inspector-tabs button:hover { color: var(--k10); }
.inspector-tabs button[aria-selected=true] { background: var(--k10); color: var(--k0); font-weight: 500; }
.settings-panel { flex: 1; min-height: 0; overflow: auto; padding: 20px; scrollbar-width: thin; scrollbar-color: var(--k3) transparent; }
.section-label { display: block; margin-bottom: 16px; color: var(--k5); font: 12px var(--f-mono); letter-spacing: .1em; }
.settings-panel h2 { color: var(--k9); font: 400 20px/1.35 var(--f-ko); }
.panel-note { margin: 16px 0; color: var(--k5); font-size: 12px; line-height: 1.7; }

.preset-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.preset-heading .section-label { margin: 0; }
.preset-total { color: var(--k5); font: 12px var(--f-mono); letter-spacing: .06em; }
.preset-categories { display: grid; grid-template-columns: 1fr 1fr 1.25fr; gap: 2px; margin-bottom: 12px; padding: 3px; border-radius: 999px; background: var(--k0); }
.preset-categories button { min-height: 34px; padding: 0 6px; border: 0; border-radius: 999px; background: transparent; color: var(--k6); font: 400 14px var(--f-ko); white-space: nowrap; }
.preset-categories button span { margin-left: 2px; color: var(--k5); font: 12px var(--f-mono); }
.preset-categories button:hover { color: var(--k10); }
.preset-categories button[aria-pressed=true] { background: var(--k10); color: var(--k0); }
.preset-categories button[aria-pressed=true] span { color: var(--k3); }
.preset-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.preset-grid.has-notes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.preset-item { position: relative; display: flex; min-width: 0; }
.preset-item .preset-card { width: 100%; }
.preset-grid .preset-card {
  position: relative; display: flex; align-items: center; gap: 8px; min-width: 0; min-height: 48px; padding: 8px 10px;
  border: 0; border-radius: 12px; background: var(--k0); color: var(--k7); font: 400 14px var(--f-ko); text-align: left;
}
.preset-grid .preset-card:hover { background: var(--k2); color: var(--k10); }
.preset-grid .preset-card[aria-pressed=true] { background: var(--k10); color: var(--k0); }
.preset-swatch { display: block; flex-shrink: 0; width: 14px; height: 14px; border-radius: 50%; box-shadow: inset 0 0 0 1px var(--lk-edge); }
.preset-name { font-size: 14px; line-height: 1.35; word-break: keep-all; overflow-wrap: anywhere; }
.preset-item.has-note .preset-card { padding-right: 30px; gap: 6px; }
.preset-item.has-note .preset-name { font-size: 12px; }
.preset-help { position: absolute; top: 50%; right: 4px; display: grid; place-items: center; width: 24px; height: 24px; padding: 0; transform: translateY(-50%); border: 0; border-radius: 50%; background: var(--k2); color: var(--k8); font: 12px var(--f-mono); cursor: help; }
.preset-help:hover, .preset-help[aria-expanded=true] { background: var(--k4); color: var(--k10); }
.preset-card[aria-pressed=true] + .preset-help { background: var(--k8); color: var(--k0); }
.selected-preset { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 12px 0 0; padding: 0 0 16px; color: var(--k5); font-size: 12px; }
.selected-preset output { color: var(--k9); font-size: 14px; text-align: right; }

.color-field { display: flex; align-items: center; gap: 12px; padding: 16px 0; border-top: 1px solid var(--k2); color: var(--k6); font-size: 14px; }
.color-field output { margin-left: auto; color: var(--k8); font: 14px var(--f-mono); text-transform: uppercase; }
.color-field input { width: 40px; height: 40px; padding: 0; border: 0; border-radius: 50%; background: transparent; overflow: hidden; cursor: pointer; }
.color-field input::-webkit-color-swatch-wrapper { padding: 0; }
.color-field input::-webkit-color-swatch { border: 0; border-radius: 50%; box-shadow: inset 0 0 0 1px var(--lk-edge); }
.color-field input::-moz-color-swatch { border: 0; border-radius: 50%; }
.control-group { margin: 12px 0 16px; }
.control-group label { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 2px; color: var(--k6); font-size: 14px; line-height: 1.6; }
.control-group output { color: var(--k10); font: 14px var(--f-mono); }
.advanced { margin-top: 8px; padding: 4px 0; border-top: 1px solid var(--k2); }
.advanced + .advanced { margin-top: 0; }
.advanced summary { justify-content: flex-start; }
.advanced summary > span { display: none; }
.advanced > div { padding: 4px 0 8px; }
.material-subheading { margin: 16px 0 4px; color: var(--k5); font: 500 12px/1.4 var(--f-ko); letter-spacing: .04em; }
.material-subheading:not(:first-child) { padding-top: 16px; border-top: 1px solid var(--k2); }
.reflection-settings .ior-control { margin: 16px 0; }
.ior-inputs { display: flex; align-items: center; gap: 12px; }
.ior-inputs input[type=range] { flex: 1; min-width: 24px; }
.ior-inputs input[type=number] { flex-shrink: 0; width: 88px; padding: 0 14px; appearance: textfield; }
.ior-inputs input[type=number]::-webkit-inner-spin-button { appearance: none; }
.control-caption { display: block; margin-top: 8px; color: var(--k5); font-size: 12px; line-height: 1.6; }
.check-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 48px; padding: 8px 0; border-top: 1px solid var(--k2); color: var(--k8); font-size: 14px; cursor: pointer; }

.upload-field { position: relative; display: block; margin: 20px 0 0; padding: 20px; border: 1.5px dashed var(--k3); border-radius: var(--lk-radius-m); color: var(--k9); font-size: 16px; cursor: pointer; }
.upload-field:hover { border-color: var(--k5); }
.upload-field span { display: block; margin-top: 4px; color: var(--k5); font: 12px var(--f-mono); }
.upload-field input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.upload-field:focus-within { outline: 2px solid var(--k10); outline-offset: 3px; }
.wide-button { display: flex; align-items: center; justify-content: center; width: 100%; min-height: 40px; padding: 0 18px; border: 0; border-radius: 999px; background: var(--k2); color: var(--k9); font: 400 14px var(--f-ko); }
.wide-button:hover { background: var(--k3); color: var(--k10); }
.inspector-footer { display: flex; flex-shrink: 0; justify-content: space-between; gap: 8px; padding: 8px 12px 12px; border-top: 1px solid var(--k2); }
.inspector-footer button { min-height: 36px; padding: 0 12px; border: 0; border-radius: 999px; background: transparent; color: var(--k6); font: 400 14px var(--f-ko); }
.inspector-footer button:hover { background: var(--k2); color: var(--k10); }

/* ---------- dialogs and notes ---------- */
body[data-lab] dialog { width: min(900px, calc(100vw - 32px)); max-height: 82vh; padding: 28px; overflow: auto; border: 0; border-radius: var(--lk-radius); background: var(--k1); color: var(--k8); }
body[data-lab] dialog::backdrop { background: rgb(0 0 0 / .72); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
body[data-lab] dialog :focus-visible { outline: 2px solid var(--k10); outline-offset: 3px; }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--k2); }
.dialog-heading h2 { color: var(--k9); font: 400 20px/1.35 var(--f-ko); }
.dialog-heading button { min-height: 36px; padding: 0 14px; border: 0; border-radius: 999px; background: var(--k2); color: var(--k8); font: 400 14px var(--f-ko); }
.dialog-heading button:hover { background: var(--k3); color: var(--k10); }
dialog > p { color: var(--k6); font-size: 14px; line-height: 1.8; }
.guide-intro { margin:0 0 20px; }
.concept-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); align-items:start; gap:12px; }
.concept-card { min-width:0; padding:24px; border-radius:var(--lk-radius-m); background:var(--k0); }
.concept-card h3 { margin:0 0 8px; color:var(--k10); font:500 24px/1.2 var(--f-mono); }
.concept-expansion { margin:0; color:var(--k8); font:14px/1.65 var(--f-lat); overflow-wrap:anywhere; }
.concept-translation { margin:4px 0 20px; color:var(--k6); font:14px/1.6 var(--f-ko); }
.concept-summary { margin:0; color:var(--k9); font:400 16px/1.8 var(--f-ko); word-break:keep-all; overflow-wrap:anywhere; }
.concept-summary > span { display:block; margin-bottom:6px; color:var(--k5); font:12px/1.6 var(--f-ko); }
.concept-detail { margin-top:20px; border-top:1px solid var(--k2); }
.concept-detail summary { min-height:44px; padding:12px 0 0; color:var(--k8); font:400 14px/1.6 var(--f-ko); cursor:pointer; }
.concept-detail summary:hover { color:var(--k10); }
.concept-detail p { margin:16px 0 0; color:var(--k7); font:14px/1.85 var(--f-ko); word-break:keep-all; overflow-wrap:anywhere; }
.concept-detail .concept-try { padding:16px; border-radius:10px; background:var(--k1); color:var(--k8); }
.concept-try strong { display:block; margin-bottom:4px; color:var(--k9); font-weight:500; }
.concept-relation { margin:20px 0 28px; padding:0 4px 20px; border-bottom:1px solid var(--k2); }
.concept-relation h3, .guide-section-title { margin:0 0 10px; color:var(--k9); font:500 16px/1.5 var(--f-ko); }
.concept-relation p { margin:0; color:var(--k6); font:14px/1.8 var(--f-ko); }
.concept-relation strong { color:var(--k8); font-weight:400; }
.guide-section-title { margin-bottom:16px; }
.guide-sources { display:flex; flex-wrap:wrap; gap:8px 20px; margin-top:24px; padding-top:20px; border-top:1px solid var(--k2); font:12px/1.8 var(--f-ko); }
.guide-sources span { flex-basis:100%; color:var(--k5); }
.guide-sources a { color:var(--k7); text-underline-offset:4px; }
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.guide-grid article { padding: 20px; border-radius: var(--lk-radius-m); background: var(--k0); }
.guide-grid article > span { color: var(--k5); font: 12px var(--f-mono); letter-spacing: .06em; }
.guide-grid h3 { margin: 8px 0; color: var(--k9); font-size: 16px; font-weight: 500; }
.guide-grid p { color: var(--k6); font-size: 14px; line-height: 1.85; }
.guide-grid a { display: inline-block; margin-top: 8px; color: var(--k8); font-size: 14px; text-underline-offset: 4px; }
.reference-table { width: 100%; margin-top: 16px; border-collapse: collapse; font: 14px/1.7 var(--f-mono); }
.reference-table th, .reference-table td { padding: 10px 12px 10px 0; border-bottom: 1px solid var(--k2); text-align: left; }
.reference-table th { color: var(--k5); font-size: 12px; font-weight: 400; }
.reference-table td { color: var(--k8); }
.reference-table .material-name { color: var(--k9); }

.material-note { position: fixed; z-index: 2000; box-sizing: border-box; width: min(340px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); padding: 20px; overflow: auto; overscroll-behavior: contain; border-radius: var(--lk-radius-m); background: var(--k2); color: var(--k8); box-shadow: 0 16px 40px rgb(0 0 0 / .6); }
.material-note[hidden] { display: none; }
.material-note-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.material-note-heading h2 { margin: 0; color: var(--k10); font: 500 16px var(--f-ko); }
.material-note-close { display: grid; place-items: center; flex-shrink: 0; width: 32px; height: 32px; padding: 0; border: 0; border-radius: 50%; background: var(--k3); color: var(--k9); font-size: 20px; line-height: 1; cursor: pointer; }
.material-note-close:hover { background: var(--k4); color: var(--k10); }
.material-note-mechanism { display: block; color: var(--k6); font-size: 12px; letter-spacing: .02em; }
.material-note p { margin: 12px 0; font: 14px/1.8 var(--f-ko); word-break: keep-all; overflow-wrap: anywhere; }
.material-note .material-note-simulation { padding-top: 12px; border-top: 1px solid var(--k3); color: var(--k6); font-size: 12px; line-height: 1.8; }
.material-note > a { display: inline-block; color: var(--k9); font-size: 12px; line-height: 1.6; text-decoration: underline; text-underline-offset: 3px; }
.material-note :focus-visible { outline: 2px solid var(--k10); outline-offset: 3px; }

/* ---------- smaller screens ---------- */
@media (max-width: 1050px) {
  .material-workspace { grid-template-columns: minmax(0, 1fr) 340px; }
  .settings-panel { padding: 20px 16px; }
  .stage-top > span:last-child { display: none; }
}
@media (max-width: 1200px) and (min-width: 761px) {
  .specimen-controls { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .material-workspace { --height: 440px; grid-template-columns: minmax(0, 1fr); }
  .specimen-column { height: auto; padding: 8px; border-radius: 18px; }
  .material-stage { flex: none; height: var(--height); border-radius: 12px; }
  .specimen-controls { padding: 16px 8px 8px; }
  .material-inspector { height: auto; }
  .settings-panel { overflow: visible; max-height: none; }
  .stage-top { top: 12px; left: 12px; right: 12px; }
  .stage-info { left: 12px; bottom: 60px; gap: 18px; padding: 8px 12px; }
  .stage-info output { font-size: 14px; }
  .stage-bottom { left: 12px; right: 12px; bottom: 12px; gap: 8px; }
  .under-stage { display: block; }
  .under-stage > span { display: block; margin-top: 8px; text-align: left; }
  .preset-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .guide-grid { grid-template-columns: 1fr; }
  .concept-grid { grid-template-columns:1fr; }
  .concept-card { padding:20px; }
  body[data-lab] dialog { padding: 20px; }
}
@media (max-width: 400px) {
  .material-workspace { --height: 380px; }
  .specimen-controls { grid-template-columns: 1fr; }
  .stage-bottom > span { max-width: 170px; }
}