/* Base styles shared with data-eng-advanced and ml-showcase (dark-only), plus the simulator. */
:root {
  color-scheme: dark;
  --page: #121212;
  --surface: #1a1a19;
  --raised: #212120;
  --ink: #f4f4f2;
  --ink-2: #c3c2b7;
  --muted: #8f8d86;
  --grid: #2c2c2a;
  --axis: #43433f;
  --line: rgba(255, 255, 255, 0.1);
  --accent: #7aa7ff;
  --accent-hover: #9dbfff;
  --on-accent: #0e1a33;
  --s1: #3987e5;
  --s2: #d95926;
  --s3: #199e70;
  --s4: #c98500;
  --s5: #d55181;
  --s6: #8a6cf0;
  --good: #0ca30c;
  --good-ink: #3fc13f;
  --warn-ink: #e0a526;
  --critical: #e25555;
  --good-bg: rgba(12, 163, 12, 0.14);
  --warn-bg: rgba(201, 133, 0, 0.16);
  --bad-bg: rgba(226, 85, 85, 0.16);
  --new-bg: rgba(122, 167, 255, 0.14);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 4rem; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
h1, h2, h3 { line-height: 1.2; margin: 0; }
p { margin: 0 0 0.85em; }
code { font-family: var(--mono); font-size: 0.88em; background: var(--raised); padding: 0.05em 0.3em; border-radius: 4px; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 3.25rem;
}
.brand {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.brand:hover { color: var(--ink); }
.brand svg { color: var(--accent); }
.topnav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
  margin-left: auto;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  white-space: nowrap;
}
.topnav a:hover { color: var(--ink); background: var(--raised); }
.topnav a.active { color: var(--ink); background: var(--raised); box-shadow: inset 0 0 0 1px var(--line); }
.topnav .n { color: var(--muted); margin-right: 0.3rem; font-variant-numeric: tabular-nums; }

main { max-width: 76rem; margin: 0 auto; padding: 1.5rem 1rem 3rem; }

/* ---------- home ---------- */
.hero { padding: 2.5rem 0 2rem; max-width: 46rem; }
.hero h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); letter-spacing: -0.02em; margin-bottom: 1rem; }
.hero p { font-size: 1.1rem; color: var(--ink-2); }
.kicker {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}
.disclaimer {
  border-left: 3px solid var(--axis);
  padding: 0.25rem 0 0.25rem 1rem;
  color: var(--ink-2);
  font-size: 0.92rem;
  max-width: 46rem;
}

/* ---------- panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1rem 1rem;
  min-width: 0;
}
.panel-title { font-size: 0.92rem; font-weight: 600; color: var(--ink); margin: 0 0 0.2rem; }
.panel-sub { font-size: 0.82rem; color: var(--muted); margin: 0 0 0.6rem; }

/* ---------- controls ---------- */
.controls { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.controls + .controls { margin-top: 0.6rem; }
.btn {
  appearance: none;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--raised);
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  min-height: 2.25rem;
}
.btn:hover { border-color: var(--axis); color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn.ghost { background: transparent; }
.btn.danger { border-color: rgba(226, 85, 85, 0.5); }
.btn.mini { font-size: 0.75rem; padding: 0.15rem 0.5rem; min-height: 0; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; padding: 2px; background: var(--page); flex-wrap: wrap; }
.seg button {
  appearance: none;
  font: inherit;
  font-size: 0.85rem;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  min-height: 2rem;
}
.seg button[aria-pressed="true"] { background: var(--raised); color: var(--ink); box-shadow: 0 0 0 1px var(--line); font-weight: 600; }
.ctl { display: grid; grid-template-columns: 1fr auto; gap: 0.1rem 0.75rem; align-items: baseline; font-size: 0.88rem; color: var(--ink-2); }
.ctl input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); margin: 0.2rem 0 0; }
.ctl output { font-variant-numeric: tabular-nums; color: var(--ink); font-weight: 600; }
.ctls { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: 0.8rem 1.25rem; }
.check { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.88rem; color: var(--ink-2); cursor: pointer; }
.check input { accent-color: var(--accent); width: 1rem; height: 1rem; }
.checks { display: grid; grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); gap: 0.4rem 1rem; }
select {
  font: inherit;
  font-size: 0.88rem;
  background: var(--page);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.4rem 0.5rem;
  min-height: 2.25rem;
  max-width: 100%;
}
.lbl { font-size: 0.82rem; color: var(--muted); }

/* ---------- readouts ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr)); gap: 0.6rem; }
.stat { background: var(--page); border-radius: 8px; padding: 0.5rem 0.7rem; min-width: 0; }
.stage > .stats .stat { background: var(--surface); border: 1px solid var(--line); }
.stat-label { display: block; font-size: 0.76rem; color: var(--muted); }
.stat-value { display: block; font-size: 1.25rem; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat-note { display: block; font-size: 0.75rem; color: var(--muted); }
.code {
  font-family: var(--mono);
  font-size: 0.8rem;
  background: var(--page);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  color: var(--ink-2);
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre;
  margin: 0;
}
.code .kw { color: var(--accent); }
.callout { font-size: 0.88rem; color: var(--ink-2); margin: 0.6rem 0 0; }
.msg { font-size: 0.88rem; border-radius: 8px; padding: 0.55rem 0.75rem; margin: 0; background: var(--page); color: var(--ink-2); }
.msg.good { background: var(--good-bg); color: var(--ink); }
.msg.bad { background: var(--bad-bg); color: var(--ink); }
.msg.warn { background: var(--warn-bg); color: var(--ink); }
.good-text { color: var(--good-ink); font-weight: 600; }
.bad-text { color: var(--critical); font-weight: 600; }
.warn-text { color: var(--warn-ink); font-weight: 600; }

.legend { display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; font-size: 0.82rem; color: var(--ink-2); margin: 0 0 0.5rem; }
.legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.sw { width: 10px; height: 10px; border-radius: 2px; display: inline-block; flex: none; }

/* ---------- wrap-up ---------- */
.checklist { list-style: none; padding: 0; margin: 0 0 2rem; display: grid; grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr)); gap: 1rem; }
.checklist li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; color: var(--ink-2); font-size: 0.95rem; }
.checklist h3 { font-size: 1rem; color: var(--ink); margin-bottom: 0.4rem; }
.checklist p:last-child { margin: 0; }
.section-h { font-size: 1.3rem; margin: 0 0 1rem; }

footer.site {
  max-width: 76rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- simulator layout ---------- */
.sim {
  display: grid;
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  grid-template-areas: "diagram diagram" "left right";
  gap: 1rem;
  align-items: start;
}
.p-diagram { grid-area: diagram; }
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; align-items: start; }
.sim-col.left { grid-area: left; }
.sim-col.right { grid-area: right; }
.sim-col { display: flex; flex-direction: column; gap: 1rem; min-width: 0; }
.field { display: grid; gap: 0.3rem; margin-bottom: 0.75rem; }
.field select { width: 100%; }
textarea {
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.45;
  background: var(--page);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.5rem 0.6rem;
  width: 100%;
  min-height: 7.5rem;
  resize: vertical;
}
textarea:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.blurb { font-size: 0.86rem; color: var(--ink-2); margin: 0 0 0.75rem; min-height: 2.6em; }
.hint { font-size: 0.78rem; color: var(--muted); margin: 0.35rem 0 0; }
.sim-ctl { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.sim-ctl + .sim-ctl { margin-top: 0.6rem; }
.status { font-size: 0.82rem; color: var(--muted); margin: 0.6rem 0 0; min-height: 1.3em; }

/* ---------- diagram ---------- */
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .wide { display: block; max-width: 64rem; margin: 0 auto; }
.diagram .narrow { display: none; }
.dg-node rect { fill: var(--page); stroke: var(--axis); stroke-width: 1.2; transition: fill 0.2s, stroke 0.2s; }
.dg-node text { fill: var(--ink-2); font: 600 12.5px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; text-anchor: middle; dominant-baseline: middle; pointer-events: none; }
.dg-node text.sub { fill: var(--muted); font-weight: 400; font-size: 10.5px; }
.dg-node.chip rect { rx: 4px; }
.dg-node.chip text { font: 9.5px var(--mono); fill: var(--muted); }
.dg-node.chip.write text { fill: var(--ink-2); }
.dg-node.chip.write rect { stroke-dasharray: 3 2; }
.dg-node.visited rect { stroke: var(--accent); stroke-opacity: 0.55; }
.dg-node.visited text { fill: var(--ink); }
.dg-node.active rect { fill: var(--new-bg); stroke: var(--accent); stroke-width: 2.2; stroke-opacity: 1; }
.dg-node.active text { fill: var(--ink); }
.dg-node.active.bad rect { fill: var(--bad-bg); stroke: var(--critical); }
.dg-node.active.warn rect { fill: var(--warn-bg); stroke: var(--warn-ink); }
.dg-node.active.good rect { fill: var(--good-bg); stroke: var(--good-ink); }
.dg-node.active rect { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { stroke-width: 3.4; } }
.dg-edge { fill: none; stroke: var(--grid); stroke-width: 1.4; transition: stroke 0.2s; }
.dg-edge.dashed { stroke-dasharray: 3 3; }
.dg-edge.visited { stroke: var(--accent); stroke-opacity: 0.7; stroke-width: 2; }
.dg-zone { fill: none; stroke: var(--line); stroke-dasharray: 4 4; }
.dg-zone-l { fill: var(--muted); font: 10.5px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; letter-spacing: 0.04em; }
.diagram-legend { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; font-size: 0.78rem; color: var(--muted); margin: 0.5rem 0 0; }
.diagram-legend span { display: inline-flex; align-items: center; gap: 0.35rem; }
.lg-box { width: 14px; height: 9px; border: 1.2px solid var(--axis); border-radius: 2px; display: inline-block; }
.lg-box.dash { border-style: dashed; }
.lg-box.on { border-color: var(--accent); background: var(--new-bg); }

/* ---------- metrics ---------- */
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.5rem; }
.metrics .stat.outcome { grid-column: span 2; }
.efficiency { margin-top: -0.4rem; }
.metrics .stat { background: var(--surface); border: 1px solid var(--line); }
.metrics .stat-value { font-size: 1.1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.metrics .stat.outcome .stat-value { font-size: 0.95rem; line-height: 1.3; white-space: normal; padding-top: 0.15rem; }
.metrics .good .stat-value { color: var(--good-ink); }
.metrics .bad .stat-value { color: #ff9a9a; }
.metrics .warn .stat-value { color: var(--warn-ink); }

/* ---------- human review ---------- */
.hitl.waiting { border-color: var(--warn-ink); box-shadow: 0 0 0 1px var(--warn-ink); }
.hitl .q { font-size: 0.9rem; color: var(--ink); margin: 0 0 0.6rem; }
.hitl .risk { margin-bottom: 0.5rem; }
.hitl .as { font-size: 0.84rem; color: var(--warn-ink); margin: 0 0 0.5rem; }
.idle { font-size: 0.86rem; color: var(--muted); margin: 0; }
.reply { font-size: 0.9rem; color: var(--ink); margin: 0.4rem 0 0; overflow-wrap: anywhere; }

/* ---------- trace ---------- */
.trace-head { display: flex; justify-content: space-between; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.trace-tools { display: flex; gap: 0.35rem; }
.trace-list { list-style: none; margin: 0.4rem 0 0; padding: 0; max-height: 34rem; overflow-y: auto; border-top: 1px solid var(--line); }
.trace-list:empty::before { content: "Nothing yet. Pick a scenario and press Run or Step."; display: block; color: var(--muted); font-size: 0.86rem; padding: 0.8rem 0.2rem; }
.trace-list li { border-bottom: 1px solid var(--line); }
.trace-list summary {
  display: grid;
  grid-template-columns: 4.3rem 6.6rem minmax(0, 1fr) auto;
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.4rem 0.3rem;
  cursor: pointer;
  font-size: 0.85rem;
  list-style: none;
}
.trace-list summary::-webkit-details-marker { display: none; }
.trace-list summary:hover { background: var(--raised); }
.trace-list .ts { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.trace-list .ti { color: var(--ink); min-width: 0; overflow-wrap: anywhere; }
.trace-list .ti::before { content: "▸"; color: var(--muted); display: inline-block; width: 0.9rem; transition: transform 0.15s; }
.trace-list details[open] .ti::before { transform: rotate(90deg); }
.trace-list .dur { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); white-space: nowrap; }
.trace-list .body { padding: 0 0.3rem 0.6rem 5rem; font-size: 0.84rem; color: var(--ink-2); }
.trace-list .body p { margin: 0 0 0.4rem; }
.trace-list .code { white-space: pre-wrap; overflow-wrap: anywhere; max-height: 18rem; overflow-y: auto; }
.trace-list li.new { animation: flash 0.9s ease-out; }
@keyframes flash { from { background: var(--new-bg); } to { background: transparent; } }
.ev { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.03em; text-transform: uppercase; padding: 0.08rem 0.4rem; border-radius: 4px; background: var(--raised); color: var(--ink-2); justify-self: start; white-space: nowrap; }
.ev.decision { color: #a9c4ff; background: rgba(122, 167, 255, 0.12); }
.ev.tool_call, .ev.tool_result { color: #8fd6bd; background: rgba(25, 158, 112, 0.14); }
.ev.tool_error { color: #ff9a9a; background: var(--bad-bg); }
.ev.retry { color: var(--warn-ink); background: var(--warn-bg); }
.ev.guardrail, .ev.gate { color: #f0a3c0; background: rgba(213, 81, 129, 0.15); }
.ev.approval_request, .ev.approval { color: var(--warn-ink); background: var(--warn-bg); }
.ev.outcome { color: var(--on-accent); background: var(--accent); }
.lv-bad .ti { color: #ff9a9a; }
.lv-warn .ti { color: var(--warn-ink); }
.json .k { color: #a9c4ff; }
.json .s { color: #8fd6bd; }
.json .n { color: var(--warn-ink); }
.json .b { color: #f0a3c0; }
.tok { font-size: 0.76rem; color: var(--muted); }

/* ---------- real build ---------- */
.section { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.section > .lede { color: var(--ink-2); max-width: 46rem; margin-bottom: 1.25rem; }
.checklist code { font-size: 0.82em; }
.compare { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.compare th, .compare td { text-align: left; vertical-align: top; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); }
.compare th { color: var(--muted); font-weight: 600; font-size: 0.78rem; }
.compare td:first-child { color: var(--ink); font-weight: 600; white-space: nowrap; }
.compare td { color: var(--ink-2); }
.tbl-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tag { display: inline-block; font-size: 0.72rem; font-weight: 600; padding: 0.05rem 0.4rem; border-radius: 4px; background: var(--raised); color: var(--ink-2); }
.tag.bad { background: var(--bad-bg); color: #ff9a9a; }
.tag.good { background: var(--good-bg); color: var(--good-ink); }
.tag.warn { background: var(--warn-bg); color: var(--warn-ink); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

@media (max-width: 900px) {
  /* One column. The two column wrappers dissolve so each panel can be ordered on its own:
     controls, diagram, metrics, human review, trace, reply. */
  .sim { display: flex; flex-direction: column; align-items: stretch; }
  .sim-col, .duo { display: contents; }
  .p-controls { order: 1; }
  .p-diagram { order: 2; }
  .metrics { order: 3; }
  .efficiency { order: 3; margin-top: 0; }
  .hitl { order: 4; }
  .p-trace { order: 5; }
  .p-reply { order: 6; }
}
@media (max-width: 640px) {
  main { padding-top: 1rem; }
  .brand span { display: none; }
  .panel { padding: 0.75rem; }
  .hero { padding-top: 1.25rem; }
  .diagram .wide { display: none; }
  .diagram .narrow { display: block; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trace-list summary { grid-template-columns: 3.6rem minmax(0, 1fr) auto; }
  .trace-list summary .ev { grid-column: 2; grid-row: 1; }
  .trace-list summary .ti { grid-column: 1 / -1; grid-row: 2; }
  .trace-list .body { padding-left: 0.3rem; }
  .trace-list { max-height: 28rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}