:root {
  --bg: #080c11;
  --surface: #0c1219;
  --surface-raised: #101720;
  --surface-inset: #090e14;
  --line: #27313d;
  --line-soft: #1c2530;
  --text: #e3e8ee;
  --text-soft: #c2cad4;
  --muted: #929dab;
  --faint: #6f7b8a;
  --accent: #6f96cf;
  --accent-strong: #4d79b8;
  --good: #68c394;
  --danger: #df7d89;
  --amber: #d2b36a;
  --focus: rgba(111, 150, 207, 0.24);
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.45;
  text-rendering: optimizeLegibility;
}
button, input, select { font: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: 10px;
  z-index: 200;
  transform: translateY(-160%);
  padding: 8px 10px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

/* Runtime header --------------------------------------------------------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  height: 58px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(8, 12, 17, 0.98);
  border-bottom: 1px solid var(--line);
  transition: transform 150ms ease;
}
body.runtime-ready .topbar { transform: translateY(-52px); }
body.runtime-ready .topbar:hover,
body.runtime-ready .topbar:focus-within { transform: translateY(0); }
.brand-wrap { min-width: 0; }
.brand { font-size: 14px; font-weight: 700; letter-spacing: -0.01em; }
.runtime-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}
.runtime-pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
}
.runtime-pill.ready .dot { background: var(--good); }
.runtime-pill.error .dot { background: var(--danger); }

/* Page frame ------------------------------------------------------------- */
.shell {
  width: min(1500px, calc(100% - 44px));
  margin: 0 auto;
  padding: 86px 0 46px;
  transition: padding-top 150ms ease;
}
body.runtime-ready .shell { padding-top: 28px; }

.intro {
  padding: 13px 0 16px;
  max-width: 1040px;
}
.intro h1 {
  margin: 0 0 10px;
  color: #edf1f5;
  font-size: clamp(26px, 2.4vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 720;
}
.intro p {
  margin: 0;
  max-width: 980px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}
.intro-meta {
  margin-top: 10px !important;
  color: var(--faint) !important;
  font-size: 12.5px !important;
  letter-spacing: 0.005em;
}
.reference-note {
  margin: 2px 0 0;
  padding: 10px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  color: #aaa596;
  font-size: 12.5px;
  line-height: 1.55;
}
.reference-note strong { color: #c6bea9; }

/* Navigation ------------------------------------------------------------- */
.tabs {
  display: flex;
  gap: 0;
  margin: 12px 0 18px;
  padding: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}
.tab {
  flex: 0 0 auto;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 12px 11px 10px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 620;
  white-space: nowrap;
}
.tab:hover { color: var(--text-soft); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Layout ---------------------------------------------------------------- */
.workspace,
.agent-layout,
.research-grid {
  display: grid;
  grid-template-columns: 410px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.planner-grid { grid-template-columns: 370px minmax(0, 1fr); }
.results-column,
.agent-results,
.research-results { min-width: 0; display: grid; gap: 14px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.controls-panel,
.agent-controls,
.research-controls {
  padding: 20px;
  position: sticky;
  top: 14px;
}
.result-panel,
.wide-panel,
.research-panel { padding: 20px; }
.panel-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}
.panel-title-row h2 {
  margin: 0;
  font-size: 19px;
  line-height: 1.25;
  letter-spacing: -0.018em;
  font-weight: 700;
}
.panel-title-row p { margin: 5px 0 0; }

/* Small labels: intentionally plain, not eyebrow/kicker styling. */
.section-kicker {
  margin: 0 0 9px;
  color: #a4afbc;
  font-size: 12.5px;
  line-height: 1.3;
  font-weight: 650;
  letter-spacing: 0;
  text-transform: none;
}
.panel-title-row .section-kicker { display: none; }
.tag {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  padding: 2px 0;
  border: 0;
  background: transparent;
  font-size: 11.5px;
  white-space: nowrap;
}
.tag.good { color: var(--good); }
.tag.bad { color: var(--danger); }

/* Controls --------------------------------------------------------------- */
label {
  display: block;
  position: relative;
  color: #b9c2cd;
  font-size: 12.5px;
  font-weight: 620;
}
select,
input[type="number"] {
  width: 100%;
  height: 40px;
  margin-top: 7px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface-inset);
  color: var(--text);
  padding: 0 10px;
  outline: none;
  font-size: 14px;
}
select:hover,
input[type="number"]:hover { border-color: #374352; }
select:focus,
input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--focus);
}
.unit {
  position: absolute;
  right: 9px;
  bottom: 12px;
  color: var(--faint);
  font-size: 10.5px;
  pointer-events: none;
}
.field-grid { display: grid; gap: 11px; margin-bottom: 11px; }
.field-grid.two { grid-template-columns: 1fr 1fr; }
.field-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.subcontrols {
  margin: 13px 0 5px;
  padding: 13px;
  border: 1px solid var(--line-soft);
  background: var(--surface-inset);
}
.subcontrols .section-kicker { margin-bottom: 10px; }
hr { border: 0; border-top: 1px solid var(--line-soft); margin: 18px 0; }
.hidden { display: none !important; }
.field-disabled { opacity: 0.5; }

input[type="file"] {
  width: 100%;
  margin-top: 8px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface-inset);
  color: var(--text-soft);
  font-size: 12.5px;
}
input[type="file"]::file-selector-button {
  margin-right: 10px;
  padding: 7px 10px;
  border: 1px solid #3b4858;
  border-radius: 2px;
  background: var(--surface-raised);
  color: var(--text-soft);
  cursor: pointer;
}
.trace-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  color: var(--text-soft);
  font-size: 12.5px;
}
.control-help,
.tiny-note {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

button.primary,
button.secondary {
  min-height: 41px;
  border-radius: 2px;
  font-size: 13.5px;
  font-weight: 680;
  cursor: pointer;
  transition: background-color 110ms ease, border-color 110ms ease, color 110ms ease;
}
button.primary {
  width: 100%;
  margin-top: 11px;
  border: 1px solid #6489c0;
  background: var(--accent-strong);
  color: #fff;
}
button.primary:hover:not(:disabled) { background: #5885c5; }
button.secondary {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-soft);
}
button.secondary:hover:not(:disabled),
.mini-button:hover:not(:disabled),
.chart-expand:hover,
.chart-download:hover {
  border-color: #465466;
  background: var(--surface-raised);
  color: var(--text);
}
button:disabled { opacity: 0.4; cursor: not-allowed; }
.compact {
  width: auto !important;
  min-width: 160px;
  padding: 0 16px;
  margin-top: 0 !important;
}
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; }
.action-stack,
.stacked-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: flex-end;
  gap: 8px;
}
.stacked-actions .compact { min-width: 166px; }
.horizontal-actions { margin: 10px 0 14px; justify-content: flex-start; }
.checkline { display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12.5px; font-weight: 600; }
.checkline input { accent-color: var(--accent); }

/* Results ---------------------------------------------------------------- */
.empty-state {
  min-height: 330px;
  display: grid;
  place-content: center;
  padding: 28px;
  text-align: center;
  color: var(--muted);
}
.empty-state.small { min-height: 210px; }
.empty-state h3 { margin: 0 0 6px; color: var(--text-soft); font-size: 16px; font-weight: 650; }
.empty-state p { max-width: 620px; margin: 0; font-size: 13.5px; line-height: 1.6; }

/* Metrics read as a strip, not a grid of product cards. */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  margin-bottom: 13px;
  border: 1px solid var(--line-soft);
  background: var(--surface-inset);
}
.metric-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.metric-grid.six-agent { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.metric-grid.eight-agent { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.metric {
  min-height: 84px;
  padding: 13px 14px;
  border: 0;
  border-right: 1px solid var(--line-soft);
  background: transparent;
}
.metric:last-child { border-right: 0; }
.metric span { display: block; margin-bottom: 8px; color: var(--muted); font-size: 11.5px; }
.metric strong { font-size: 20px; line-height: 1.2; letter-spacing: -0.025em; }
.metric strong.metric-small { font-size: 14.5px; line-height: 1.35; }

.diagnostic-card {
  margin-bottom: 13px;
  padding: 14px 15px;
  border: 1px solid var(--line);
  background: transparent;
}
.diagnostic-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.diagnostic-head span { color: var(--muted); font-size: 11.5px; }
.diagnostic-head strong { font-size: 16px; }
.diagnostic-card p { margin: 8px 0 0; color: var(--text-soft); font-size: 13.5px; line-height: 1.55; }
.diagnostic-card .diagnostic-action { color: var(--muted); }
.evidence-row { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 10px; }
.evidence-row span {
  padding: 0;
  border: 0;
  background: transparent;
  color: #8390a0;
  font: 11px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.study-summary {
  margin-bottom: 11px;
  padding: 9px 0 9px 12px;
  border-left: 2px solid #526f96;
  background: transparent;
  color: #b9c3cf;
  font-size: 13px;
  line-height: 1.6;
}
.study-summary strong { color: var(--text); }
.warnings,
.planner-note {
  margin-top: 10px;
  padding: 9px 0 9px 11px;
  border-left: 2px solid #756542;
  background: transparent;
  color: #bbb5a7;
  font-size: 12.5px;
  line-height: 1.55;
}
.planner-note { border-left-color: #496284; color: var(--muted); }
.muted { color: var(--muted); font-size: 13.5px; line-height: 1.55; }

/* Charts ----------------------------------------------------------------- */
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.chart-card {
  position: relative;
  min-height: 300px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--surface-inset);
}
.chart-card.full { margin-top: 10px; }
.chart-head {
  min-height: 43px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 11px 7px 13px;
  border-bottom: 1px solid var(--line-soft);
}
.chart-title { color: var(--text-soft); font-size: 12.5px; font-weight: 650; }
.chart-actions { display: flex; gap: 6px; }
.chart-expand,
.chart-download,
.mini-button {
  height: 31px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 11.5px;
}
.chart-body { height: 260px; padding: 11px 12px 12px; }
.chart-body.large { height: 350px; }
.research-chart { height: 310px; }
.chart-card.chart-expanded {
  position: fixed;
  inset: 14px;
  z-index: 100;
  min-height: 0;
  margin: 0;
  border-color: #4a5665;
  background: #080d13;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.78);
}
.chart-card.chart-expanded .chart-body { height: calc(100vh - 78px); }
body.chart-open { overflow: hidden; }
canvas { width: 100% !important; height: 100% !important; max-height: none; }

/* Tables ----------------------------------------------------------------- */
.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  color: #a8b2bf;
  font-size: 12.5px;
}
.table-toolbar > div { display: flex; gap: 6px; }
.table-wrap {
  overflow: auto;
  margin-top: 7px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
table { width: 100%; min-width: 900px; border-collapse: collapse; font-size: 13.5px; }
th,
td {
  padding: 10px 11px;
  text-align: right;
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}
th:first-child,
td:first-child { text-align: left; }
th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #090e14;
  color: #95a1af;
  font-size: 11.5px;
  font-weight: 650;
  text-transform: none;
  letter-spacing: 0;
}
td { color: #c8d0da; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: #0f161e; }
.pass { color: var(--good); }
.fail { color: var(--danger); }
.best-label,
.pareto-label {
  display: inline;
  margin-left: 7px;
  padding: 0;
  border: 0;
  color: #9db6d8;
  font-size: 11px;
  text-transform: none;
}

/* Methodology: editorial layout instead of cards-in-cards. */
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 34px;
  row-gap: 0;
}
.prose.panel {
  padding: 22px 0 24px;
  border: 0;
  border-top: 1px solid var(--line);
  background: transparent;
}
.prose h2 { margin: 0 0 10px; font-size: 19px; letter-spacing: -0.015em; }
.prose p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.prose code { color: #a9bfdc; }
.formula {
  margin-top: 14px;
  padding: 9px 11px;
  border-left: 2px solid #435a79;
  background: var(--surface-inset);
  color: #b7c3d2;
  font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.wide-method { grid-column: 1 / -1; }
.paper-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 22px;
  margin-top: 18px;
}
.paper-grid > div {
  padding: 11px 0 13px;
  border: 0;
  border-top: 1px solid var(--line-soft);
  background: transparent;
}
.paper-grid strong { display: block; margin-bottom: 5px; font-size: 12.5px; }
.paper-grid span { display: block; color: var(--muted); font-size: 11.5px; line-height: 1.55; }

/* Experiment sections ---------------------------------------------------- */
.experiment-subsection { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
.predictive-controls { margin-top: 12px; }
.research-secondary { width: 100%; margin-top: 10px; }

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 130;
  max-width: min(480px, calc(100vw - 40px));
  padding: 10px 12px;
  border: 1px solid #465466;
  border-radius: 2px;
  background: #141c25;
  color: #d6dde5;
  font-size: 12.5px;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 140ms ease, transform 140ms ease;
}
.toast.error { border-color: #70424a; color: #efb0b8; }
.toast.show { opacity: 1; transform: translateY(0); }

/* Responsive ------------------------------------------------------------- */
@media (max-width: 1250px) {
  .metric-grid.six-agent { grid-template-columns: repeat(3, 1fr); }
  .metric-grid.eight-agent { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 1100px) {
  .workspace,
  .planner-grid,
  .agent-layout,
  .research-grid { grid-template-columns: 1fr; }
  .controls-panel,
  .agent-controls,
  .research-controls { position: static; }
  .metric-grid { grid-template-columns: repeat(3, 1fr); }
  .paper-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 960px) {
  .field-grid.four { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .topbar { padding: 0 14px; }
  .runtime-pill { max-width: 180px; }
  .shell { width: calc(100% - 20px); padding-top: 80px; }
  body.runtime-ready .shell { padding-top: 20px; }
  .intro { padding-top: 8px; }
  .tabs { margin-top: 8px; }
  .field-grid.two,
  .field-grid.four,
  .chart-grid,
  .method-grid { grid-template-columns: 1fr; }
  .metric-grid,
  .metric-grid.four,
  .metric-grid.six-agent,
  .metric-grid.eight-agent { grid-template-columns: 1fr 1fr; }
  .metric { border-bottom: 1px solid var(--line-soft); }
  .paper-grid { grid-template-columns: 1fr; }
  .panel-title-row { flex-direction: column; }
  .arena-title-row .compact,
  .stacked-actions .compact { width: 100% !important; }
  .action-stack,
  .stacked-actions { width: 100%; align-items: stretch; }
  .wide-method { grid-column: auto; }
  .chart-card.chart-expanded { inset: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}