:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #586372; background: #e9edf3; }
* { box-sizing: border-box; }
body { margin: 0; }
header { position: fixed; z-index: 2; top: 25px; left: 32px; font-size: 12px; }
span { margin: 0 9px; color: #929dab; }
.wordmark { color: inherit; text-decoration: none; white-space: nowrap; }
.wordmark strong { font-weight: 500; color: #303d4e; }
.panel-actions { display: grid; grid-template-columns: auto minmax(0, 1fr) 32px; gap: 8px; padding-top: 14px; }
.panel-actions button { padding: 9px 6px; white-space: nowrap; }
.panel-actions #download { display: grid; place-items: center; }
#download::before { content: ''; width: 18px; height: 18px; background: currentColor; mask: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGZpbGw9Im5vbmUiIHZpZXdCb3g9IjAgMCAyNCAyNCIgc3Ryb2tlLXdpZHRoPSIxLjUiIHN0cm9rZT0iYmxhY2siPgogIDxwYXRoIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCIgZD0iTTMgMTYuNXYyLjI1QTIuMjUgMi4yNSAwIDAgMCA1LjI1IDIxaDEzLjVBMi4yNSAyLjI1IDAgMCAwIDIxIDE4Ljc1VjE2LjVNMTYuNSAxMiAxMiAxNi41bTAgMEw3LjUgMTJtNC41IDQuNVYzIi8+Cjwvc3ZnPgo=") center / contain no-repeat; }
button { font: inherit; color: #4c5a6c; border: 1px solid #ffffffb3; border-radius: 6px; padding: 9px 12px; background: #f7f9fc8c; cursor: pointer; backdrop-filter: blur(12px); }
button:hover, button[aria-pressed="true"] { background: #ffffffd9; }
button:disabled { opacity: 0.55; cursor: wait; }
button:focus-visible, select:focus-visible, summary:focus-visible, canvas:focus-visible, a:focus-visible { outline: 2px solid #4776a6; outline-offset: 3px; }
#studio { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 24px; height: 100svh; min-height: 360px; padding: 24px 32px; }
#viewport { position: relative; width: 100%; min-width: 0; min-height: 0; }
canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; }
canvas:active { cursor: grabbing; }
#status { position: absolute; inset: 48% 20px auto; text-align: center; font-size: 14px; }
.variant-panel { align-self: center; margin-top: 56px; min-height: 0; max-height: calc(100% - 56px); overflow-y: auto; scrollbar-gutter: stable; padding: 14px; border: 1px solid #ffffffb3; border-radius: 8px; background: #f7f9fcad; backdrop-filter: blur(12px); font-size: 11px; }
.panel-content { display: flow-root; }
.variant-panel fieldset { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; margin: 0; padding: 0; border: 0; }
.control-group { padding: 12px 0; border-bottom: 1px solid #bcc6d166; }
.control-group summary { cursor: pointer; font-weight: 500; }
.control-group summary::marker { color: #929dab; }
.control-group summary span { float: right; font-weight: 400; color: inherit; }
/* Content owns its expansion; the panel naturally follows the same motion without a second transition. */
.reveal, .control-group::details-content { display: flow-root; interpolate-size: allow-keywords; height: 0; overflow: clip; transition: height 180ms ease, padding-top 180ms ease, content-visibility 180ms allow-discrete; }
.reveal { content-visibility: hidden; }
.reveal:not([hidden]) { height: auto; content-visibility: visible; }
.control-group::details-content { padding-top: 0; }
.control-group[open]::details-content { height: auto; padding-top: 14px; }
@media (prefers-reduced-motion: reduce) {
  .reveal, .control-group::details-content { transition: none; }
}
.variant-panel .light-selector { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.light-selector label { position: relative; justify-content: center; font-variant-numeric: tabular-nums; }
.light-selector input { position: absolute; opacity: 0; }
.variant-panel #light-name { margin: 12px 0 14px; font-weight: 500; }
.variant-panel .traced-variant { grid-column: 1 / -1; }
#trace-status { font-variant-numeric: tabular-nums; color: #3b6590; }
.variant-panel label { display: flex; align-items: center; gap: 5px; padding: 7px 6px; border: 1px solid transparent; border-radius: 5px; white-space: nowrap; cursor: pointer; }
.variant-panel label:has(input:checked) { background: #ffffffc9; border-color: #b7c6d8; }
.variant-panel label:has(input:focus-visible) { outline: 2px solid #4776a6; outline-offset: 2px; }
.variant-panel input { margin: 0; accent-color: #4776a6; width: 12px; height: 12px; }
.variant-panel span { margin: 0; color: inherit; }
.variant-panel p { margin: 9px 0 0; line-height: 1.5; }
.render-control { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.render-control label { padding: 0; cursor: default; }
.render-control select { font: inherit; color: inherit; padding: 5px 8px; min-width: 82px; border: 1px solid #b7c6d8; border-radius: 5px; background: #ffffffc9; }
.render-control select:disabled { opacity: 0.55; }
.render-control input { width: 16px; height: 16px; cursor: pointer; }
.tuning-control { display: grid; grid-template-columns: minmax(0, 1fr) auto; clear: both; gap: 6px; margin-bottom: 14px; }
.tuning-control label { padding: 0; cursor: default; }
.tuning-control output { font-variant-numeric: tabular-nums; }
.tuning-control input { grid-column: 1 / -1; width: 100%; height: 18px; cursor: pointer; }
.tuning-control input:focus-visible { outline: 2px solid #4776a6; outline-offset: 2px; }
body.void-mode { color-scheme: dark; background: #000; color: #c2cad5; }
.void-mode .wordmark strong { color: #eef3fb; }
.void-mode #trace-status { color: #a9c9ef; }
.void-mode .variant-panel { color: #c2cad5; background: #18202bcc; border-color: #536177; }
.void-mode .variant-panel label:has(input:checked) { background: #344254; border-color: #677c96; }
.void-mode button, .void-mode .render-control select { color: #e1e8f1; background: #253142cc; border-color: #536177; }
.void-mode button:hover, .void-mode button[aria-pressed="true"] { background: #3b4b62; }
.view-label { display: none; position: absolute; bottom: 16px; left: 16px; font-size: 11px; margin: 0; }
#reference { position: relative; min-width: 0; min-height: 0; margin: 0; color: #586372; background: #e9edf3; }
#reference[hidden] { display: none; }
#reference img { display: block; width: 100%; height: 100%; object-fit: contain; }
figcaption { position: absolute; left: 16px; bottom: 12px; font-size: 11px; }
#studio.comparing { grid-template-columns: 280px minmax(0, 1fr) minmax(0, 1fr); }
.comparing #viewport { border-right: 1px solid #bcc6d166; }
.comparing .view-label { display: block; }
@media (max-width: 650px) {
  header { top: 18px; left: 18px; font-size: 11px; }
  .wordmark { display: flex; flex-direction: column; gap: 5px; }
  .wordmark span { display: none; }
  button { padding: 8px; }
  #studio, #studio.comparing { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 70px 18px 18px; }
  #studio { grid-template-rows: minmax(0, 1fr) auto; }
  #studio.comparing { grid-template-rows: minmax(0, 1fr) minmax(0, 1fr) auto; }
  #viewport { grid-row: 1; }
  .variant-panel { grid-row: 2; align-self: stretch; margin-top: 0; max-height: 45svh; padding: 11px; font-size: 10px; }
  .comparing .variant-panel { grid-row: 3; }
  .comparing #reference { grid-row: 2; }
  .variant-panel label { gap: 4px; padding: 7px 4px; }
  canvas { min-height: 0; }
  .comparing .view-label { display: none; }
}