:root {
  color-scheme: dark;
  font-family: system-ui, sans-serif;
  color: #e5edf5;
  background: #0d151e;
  --border: #30465a;
  --muted: #a8bbcd;
  --accent: #65d8ee;
  --panel: #14212e;
}
* { box-sizing: border-box; }
body { margin: 0; }
.masthead { display: flex; align-items: baseline; flex-wrap: wrap; gap: .7rem 1.2rem; padding: .95rem max(1.25rem, calc((100vw - 85rem) / 2)); border-bottom: 1px solid var(--border); background: #101c27; }
.masthead strong { font-size: 1.22rem; color: var(--accent); letter-spacing: .02em; }
.masthead span, .intro p:not(.eyebrow) { color: var(--muted); }
main { max-width: 88rem; margin: 0 auto; padding: 1.6rem 1.5rem 2.5rem; }
.intro { margin-bottom: 1.5rem; }
.eyebrow { color: var(--accent); font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 .5rem; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 1rem; }
.intro p:last-child { margin: .55rem 0 0; }
.workspace { display: grid; grid-template-columns: minmax(15rem, 18rem) minmax(0, 1fr); align-items: start; gap: 1.25rem; }
.panel, .metric { border: 1px solid var(--border); border-radius: .7rem; background: var(--panel); }
.settings, .plots, .inspector { padding: 1rem; }
.param { margin-bottom: .65rem; }
label { display: block; font-size: .83rem; margin-bottom: .25rem; color: var(--muted); }
input, button { font: inherit; }
input { width: 100%; min-width: 0; background: #0c1721; color: inherit; border: 1px solid var(--border); border-radius: .35rem; padding: .44rem .6rem; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
fieldset { border: 1px solid var(--border); border-radius: .35rem; padding: .6rem .65rem .75rem; margin: .85rem 0; }
fieldset label:not(:first-of-type) { margin-top: .5rem; }
legend { font-size: .85rem; }
button { padding: .45rem .75rem; background: #1c3849; color: #e6faff; border: 1px solid #548699; border-radius: .35rem; cursor: pointer; }
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(12rem, 100%), 1fr)); gap: .7rem; }
.metric { padding: .75rem .85rem; }
.metric p { margin: 0 0 .35rem; color: var(--muted); font-size: .83rem; }
.metric strong { font-size: 1.4rem; color: var(--accent); font-variant-numeric: tabular-nums; }
.plots, .inspector { margin-top: .8rem; }
.message { margin: 0 0 .65rem; color: var(--muted); }
.message:empty { display: none; }
.message.warning { color: #ffd090; }
.plots:empty, .metrics:empty { display: none; }
.chart { width: 100%; display: block; overflow: visible; }
.chart text { fill: #bed0df; font-size: 14px; font-variant-numeric: tabular-nums; }
.chart .grid { stroke: #2b4358; stroke-width: 1; }
.chart .trace { stroke: var(--accent); stroke-width: 2; fill: none; }
.chart .marker { stroke: #ffcf83; stroke-width: 1.5; stroke-dasharray: 5 4; }
.inspector summary { cursor: pointer; }
.settings-group { border-top: 1px solid var(--border); margin: .75rem 0; padding-top: .6rem; }
.settings-group summary { cursor: pointer; margin-bottom: .6rem; }
.settings-group input { margin-bottom: .5rem; }
.noise-field { border-top: 1px solid var(--border); padding: .55rem 0; }
.noise-field select, .noise-field textarea { width: 100%; background: #0c1721; color: inherit; border: 1px solid var(--border); border-radius: .35rem; padding: .35rem; }
.noise-field textarea { resize: vertical; }
.hint { color: var(--muted); font-size: .84rem; }
.plots h2:not(:first-child) { border-top: 1px solid var(--border); padding-top: .85rem; margin-top: .65rem; }
.legend { display: flex; flex-wrap: wrap; gap: .5rem .9rem; list-style: none; padding: 0; font-size: .83rem; }
.legend li { border-left: .25rem solid; padding-left: .4rem; }
pre { overflow: auto; max-height: 22rem; font-size: .82rem; }
@media (max-width: 45rem) {
  main { padding: 1.15rem .8rem; }
  .workspace { grid-template-columns: 1fr; }
  .chart text { font-size: 17px; }
}

.action-row { display: flex; gap: .5rem; flex-wrap: wrap; margin: .65rem 0; }
.library-tools { border-bottom: 1px solid var(--border); padding-bottom: .65rem; margin-bottom: .75rem; }
.library-tools > input, .library-tools > select { margin-bottom: .5rem; }
select { max-width: 100%; width: 100%; padding: .4rem; border-radius: .35rem; background: #0c1721; color: inherit; border: 1px solid var(--border); font: inherit; }
input[type=checkbox] { width: auto; }
input[type=file] { font-size: .75rem; }
.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(10rem,100%), 1fr)); gap: .65rem; margin: .7rem 0; align-items: end; }
.field-grid label > :is(input,select):not([type=checkbox]) { display: block; margin-top: .25rem; }
.text-button { background: transparent; border: 0; color: var(--accent); font-size: .75rem; padding: .25rem .1rem; }
.text-button:hover { text-decoration: underline; }
.result-heading { display: flex; justify-content: space-between; align-items: baseline; gap: .5rem; }
.plots > .result-heading { border-top: 1px solid var(--border); padding-top: .65rem; margin-top: .55rem; }
.plots > .result-heading:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.table-wrap { overflow-x: auto; max-height: 25rem; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: .4rem .55rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--panel); position: sticky; top: 0; }
dialog { color: inherit; background: var(--panel); border: 1px solid var(--border); border-radius: .65rem; width: min(56rem, calc(100% - 2rem)); max-height: 88vh; padding: 1rem 1.25rem; }
#delete-design-dialog { width: min(26rem, calc(100% - 2rem)); }
dialog::backdrop { background: #0009; }
.dialog-header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.dialog-header h2 { margin: 0; }
.formula-entry { border-top: 1px solid var(--border); margin: .65rem 0; padding: .5rem 0; }
.formula-entry h3 { margin: .4rem 0; font-size: 1rem; }
.formula-entry pre { padding: .65rem; background: #0c1721; white-space: pre-wrap; overflow-wrap: anywhere; }
.formula-entry ul { margin: .5rem 0; padding-left: 1.25rem; }
#formula-open { margin-top: .65rem; }
.formula-entry math { padding: .65rem; background: #0c1721; overflow-x: auto; font-size: 1.13rem; }

.param input[type="range"] { padding: 0; height: 1.15rem; margin: .2rem 0 0; accent-color: var(--accent); }
.chart-widget { padding-bottom: .75rem; }
.chart-toolbar { margin: 0 0 .4rem; }
.chart-toolbar button { font-size: .79rem; padding: .35rem .55rem; }
.chart-toolbar button:disabled { opacity: .55; cursor: default; }
.chart-widget input[type="range"] { display: block; padding: 0; height: 1rem; margin-top: .2rem; accent-color: var(--accent); }
.chart-readout { margin: .35rem 0 0; min-height: 1.2rem; font-variant-numeric: tabular-nums; }
.chart-cursor { stroke: #e6edf5; stroke-width: 1; pointer-events: none; opacity: .72; }

.model-diagram-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: .4rem; }
.model-diagram-canvas { position: relative; width: 1200px; height: 480px; }
.model-diagram-canvas > svg { position: absolute; width: 100%; height: 100%; color: var(--accent); }
.model-diagram-canvas svg text, .signal-observations svg text { fill: #e5edf5; font-size: 14px; }
.signal-sum, .sampled-block { fill: var(--panel); stroke: var(--accent); stroke-width: 1.5; }
.signal-sign { font-size: 18px !important; }
.signal-block, .signal-port, .signal-noise, .signal-source-link { position: absolute; }
.signal-block { height: 60px; border-radius: 2px; border-color: var(--accent); font-size: 14px; }
.signal-comparison { height: 34px; min-height: 34px; border-radius: 50%; padding: 0; background: transparent; }
.signal-port { font-size: 13px; padding: 4px 6px; min-height: 34px; border-color: transparent; background: transparent; }
.model-diagram-canvas button[aria-pressed=true] { text-decoration: none; outline: 2px solid var(--accent); outline-offset: 2px; background: #203b4b; }
.signal-noise { width: 230px; text-align: center; font-size: 13px; }
.signal-noise .noise-trigger { margin: 0 0 6px; width: 100%; }
.signal-noise span { display: block; }
.signal-source-link { width: 230px; font-size: 13px; }
.signal-observations { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 12px; }
.signal-observations svg { width: 1100px; height: 235px; display: block; color: var(--accent); }
.signal-observations > button { margin-top: 8px; }
.dsm-observation-links { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.dsm-observation-links button { font-size: 13px; }
.filter-circuit { margin: .8rem 0; color: var(--muted); }
.filter-circuit figcaption { font-size: .85rem; }
.filter-circuit svg { display: block; width: min(100%, 400px); font-size: 14px; }
.model-selection { border-top: 1px solid var(--border); padding-top: .7rem; overflow-wrap: anywhere; }
.model-selection h3 { margin: 0; font-size: 1rem; }
.results { min-width: 0; }

#model-diagram-panel { margin: 0 0 1.25rem; }

[hidden] { display: none !important; }
#model-path { margin: 0.5rem 0 1.5rem; max-width: 100%; }
#builder-graph { white-space: pre-wrap; overflow-wrap: anywhere; }
#builder-gain { max-width: 16rem; }
.builder-diagram-scroll { overflow-x: auto; }
.builder-diagram-scroll svg { display: block; width: 100%; max-width: 920px; min-width: 620px; }

.noise-popover { position: fixed; z-index: 30; box-sizing: border-box; width: min(440px, calc(100vw - 16px)); max-height: calc(100dvh - 16px); overflow: auto; padding: 18px; border: 1px solid #65d8ee; border-radius: 10px; background: #10202b; color: #edf6fa; box-shadow: 0 12px 48px #0009; }
.noise-popover label { display: block; margin: 10px 0; }
.noise-popover input:not([type=checkbox]), .noise-popover select, .noise-popover textarea { width: 100%; box-sizing: border-box; }
.noise-popover [hidden], .noise-popover[hidden] { display: none; }
.noise-trigger { border-style: dashed; font-size: 12px; }
.noise-trigger[data-configured=true] { border-style: solid; }
.noise-close { position: sticky; top: 0; }

/* Workbench columns and controls */
:root { font-size: 14px; --control-radius: 6px; }
body { line-height: 1.45; }
::selection { background: #245569; color: #fff; }
* { scrollbar-width: thin; scrollbar-color: #486275 #101c27; }
input, textarea { caret-color: var(--accent); }
.masthead { height: 64px; padding: 10px 20px; align-items: center; }
main { max-width: none; padding: 16px 20px; }
.intro {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px 16px; margin: 0; padding: 12px 16px; border-bottom: 1px solid var(--border);
}
h1 { font-size: 22px; }
.intro p:last-child { margin: 0; font-size: 13px; }
.workspace { grid-template-columns: 192px minmax(0, 1fr); gap: 16px; align-items: start; }
#preset-workspace { display: grid; grid-template-columns: minmax(0, 1fr) 228px; gap: 16px; min-width: 0; }
#preset-workspace[hidden] { display: none; }
.project-body, .project-columns { display: grid; min-width: 0; min-height: 0; }
.project-body { grid-template-rows: auto minmax(0, 1fr); overflow: hidden; }
.project-columns { grid-template-columns: 232px minmax(0, 1fr); }
.project-columns > .settings { border-right: 1px solid var(--border); }
.project-columns > .results { padding: 14px; background: #0d151e; }
.projects { padding: 12px; background: #101c27; }
.projects summary { padding: 4px; font-weight: 650; }
#project-current { display: none; }
.project-items h2 { margin: 16px 4px 6px; font-size: 13px; color: var(--muted); }
.project-items button, .project-planned { display: block; width: 100%; padding: 8px; text-align: left; }
.project-items button { border-color: transparent; background: transparent; line-height: 1.35; }
.project-items button:hover { background: #192c3b; }
.project-items [aria-current=true] { background: #203b4b; border-color: #548699; color: var(--accent); }
.project-items small { display: block; color: var(--muted); font-size: 12px; }
.project-planned { color: var(--muted); }
.project-items [data-project=builder] { margin-top: 12px; border-top-color: var(--border); }
.section-jumps { display: none; }
@media (min-width: 1200px) {
  .projects summary { display: block; cursor: default; }
  .projects summary::marker { content: ''; }
  .projects summary::-webkit-details-marker { display: none; }
  .projects, #preset-workspace { height: calc(100dvh - 96px); }
}
@media (max-width: 1199px) {
  .workspace { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .projects summary { cursor: pointer; }
  #project-current { display: inline; margin-inline-start: 8px; color: var(--muted); font-weight: 400; }
  .project-items { max-width: 320px; }
}
@media (min-width: 960px) and (max-width: 1199px) {
  .project-body, .inspection { height: calc(100dvh - 150px); }
  .projects:has(details[open]) { max-height: 35dvh; }
}
.work-region { min-width: 0; overflow: auto; overscroll-behavior: contain; scrollbar-gutter: stable; }
.settings { background: #101c27; }
.inspection { padding: 16px; }
.inspection h3 { font-size: 13px; margin: 16px 0 6px; color: var(--muted); }
.inspection .metrics { display: block; }
.metric { border: 0; border-top: 1px solid var(--border); border-radius: 0; padding: 14px 0; background: transparent; }
.metric strong { font-size: 24px; }
.metric .result-heading { display: block; }
.metric .result-heading p { margin: 0; }
.result-heading { flex-wrap: wrap; }
.metrics { gap: 12px; }
#selection-host { border-top: 1px solid var(--border); margin-top: 16px; }
.model-selection { border: 0; }
.model-selection ul { padding-left: 16px; }
#model-diagram-panel { margin: 0 0 12px; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 16px; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.tabs button { background: transparent; border-color: transparent; padding: 8px; font-size: 13px; border-radius: 8px; }
.tabs [aria-selected=true], button[aria-pressed=true] { background: #203b4b; border-color: #548699; color: var(--accent); text-decoration: underline; text-underline-offset: 5px; }
button { background: #192c3b; border-color: #486275; min-height: 34px; border-radius: var(--control-radius); }
button:hover { background: #254353; }
button:disabled { opacity: .55; cursor: not-allowed; }
input, select, textarea { font: inherit; min-height: 34px; border-radius: var(--control-radius); }
textarea { width: 100%; padding: 8px; background: #0c1721; color: inherit; border: 1px solid var(--border); resize: vertical; }
input[type=checkbox], input[type=range] { min-height: auto; accent-color: var(--accent); }
.text-button { min-height: 28px; }
.noise-trigger { width: 100%; text-align: left; line-height: 1.5; }
#noise-inputs { border-top: 0; margin-top: 0; }
#noise-inputs > summary { font-weight: 600; }
#dsm-anchors { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
#dsm-anchors button { flex: 1 1 160px; }
.result-group + .result-group { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 16px; }
.chart-widget { overflow-x: auto; margin-top: 12px; }
.chart { min-width: 760px; }
.chart .grid { stroke: #263b4b; stroke-width: .75; }
.chart-toolbar { gap: 6px; }
.chart-readout { font-size: 12px; }
.help-label { display: flex; align-items: center; gap: 2px; }
.help-label label { margin: 0; }
.help-trigger, .help-trigger:hover {
  display: inline-grid; place-items: start start; width: 28px; height: 28px; min-height: 28px;
  padding: 3px; border: 0; background: transparent; color: var(--accent); vertical-align: middle;
}
.help-trigger span {
  display: grid; place-items: center; width: 13px; height: 13px; border: 1px solid currentColor;
  border-radius: 50%; font-size: 9px; font-weight: 700; line-height: 1;
}
.help-trigger:hover span, .help-trigger[aria-expanded=true] span { background: #203b4b; }
.help-popover { position: fixed; z-index: 50; width: 380px; overflow: auto; padding: 16px; border: 1px solid #548699; border-radius: 8px; background: #10202b; box-shadow: 0 12px 32px #0008; }
.help-popover .dialog-header { position: sticky; top: -16px; padding: 8px 0; background: #10202b; }
.help-popover h2 { font-size: 16px; }
.help-popover p { margin-bottom: 0; }
#dsm-tones { font-variant-numeric: tabular-nums; }
#dsm-tones table { min-width: 600px; }
#builder-workspace { width: 100%; min-width: 0; max-width: 1100px; margin-inline: auto; }
@media (max-width: 1100px) {
  main { padding: 12px; }
  .project-columns { grid-template-columns: 208px minmax(0, 1fr); }
}
@media (max-width: 959px) {
  .masthead { height: auto; padding: 12px; }
  #preset-workspace, .project-columns { grid-template-columns: minmax(0, 1fr); }
  .project-columns > .settings { border-right: 0; border-bottom: 1px solid var(--border); }
  .work-region { overflow: visible; scrollbar-gutter: auto; }
  .project-body { grid-template-rows: auto auto auto; }
  .section-jumps { display: flex; flex-wrap: wrap; gap: 16px; padding-inline: 16px; border-bottom: 1px solid var(--border); }
  .section-jumps a { display: grid; align-items: center; min-height: 44px; color: var(--accent); }
  .projects summary { min-height: 44px; align-content: center; }
  .tabs button, button, input, select { min-height: 44px; }
  .inspection .metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}
@media (max-width: 959px), (pointer: coarse) {
  .help-trigger, .help-trigger:hover { width: 44px; height: 44px; min-height: 44px; }
}
/* Keep auxiliary controls legible after the 14px base scale. */
label, .hint, .text-button, .chart-toolbar button { font-size: 12px; }
h2 { font-size: 16px; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
.result-group[hidden] + .result-group { border-top: 0; margin-top: 0; padding-top: 0; }

.builder-controls { display: flex; align-items: end; flex-wrap: wrap; gap: 8px; margin-block: 12px; }
.builder-controls label, .builder-blocks label { display: grid; gap: 4px; min-width: 0; }
.builder-controls select { max-width: min(250px, 75vw); }
.builder-blocks { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr)); gap: 12px; }
.builder-blocks fieldset { min-width: 0; overflow-wrap: anywhere; }
.builder-blocks input, .builder-blocks textarea { width: 100%; margin-bottom: 8px; }
#builder-graph { list-style: none; padding: 0; }
#builder-graph li { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 16px; margin-block: 8px; }
#builder-graph button { max-width: 100%; overflow-wrap: anywhere; }
#builder-status, #builder-draft-status { white-space: pre-wrap; overflow-wrap: anywhere; }

.signal-block { display: grid; align-content: center; gap: 2px; line-height: 1.15; padding-block: 4px; }
.signal-block:has(.block-param:nth-of-type(3)) { height: 80px; }
.block-param { display: flex; align-items: baseline; justify-content: center; gap: 5px; font-size: 12px; font-variant-numeric: tabular-nums; }
.block-param math { color: var(--muted); }
.model-selection:popover-open {
  position: fixed; inset: auto; margin: 0; padding: 14px; width: min(340px, calc(100vw - 16px));
  max-height: calc(100dvh - 16px); overflow: auto; border: 1px solid #548699;
  border-radius: 8px; background: #10202b; color: inherit; box-shadow: 0 12px 32px #0008;
}
.model-selection .dialog-header { gap: 8px; }
.model-values { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 12px; }
.model-values:empty { display: none; }
.sampled-math { color: #e5edf5; font-size: 14px; }
.model-values dd { margin: 0; font-variant-numeric: tabular-nums; }
.help-label h3 { margin-block: 8px; }
.help-popover { z-index: 60; }
#input-tabs button { padding-inline: 5px; }
#model-diagram-panel > summary + div { margin-top: 10px; }