:root {
  --bg: #101411;
  --bg-raise: #181e19;
  --bg-sunken: #0c0f0d;
  --line: rgba(244, 237, 224, 0.12);
  --line-strong: rgba(244, 237, 224, 0.28);
  --text: #f4efe6;
  --muted: #b7b0a3;
  --faint: #7f877f;
  --gold: #e4c48a;
  --gold-dim: rgba(228, 196, 138, 0.14);
  --mint: #9ed3b8;
  --coral: #e7a394;
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Outfit", "Avenir Next", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1000px 480px at 10% -10%, rgba(228, 196, 138, 0.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 340;
  letter-spacing: 0.01em;
}
button, textarea, a { font: inherit; color: inherit; }
button, a { cursor: pointer; }
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 18px 32px;
  background: rgba(16, 20, 17, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 580;
  letter-spacing: 0.02em;
}
.mark-seal {
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--gold);
  border-radius: 50%;
  box-shadow: inset 0 0 0 3px var(--bg), inset 0 0 0 4.5px var(--gold);
}
.nav-links {
  display: flex;
  gap: 8px;
  margin-right: auto;
}
.nav-links a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
}
.nav-links a.is-on,
.nav-links a:hover { color: var(--text); background: rgba(244, 239, 230, 0.05); }

.view { display: none; padding: 48px 32px 72px; max-width: 1180px; margin: 0 auto; }
.view.is-on { display: block; }
#view-cases.is-on {
  display: block;
  max-width: 1240px;
  padding-top: 28px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 560; letter-spacing: -0.03em; }
h1 {
  margin: 0;
  max-width: 14ch;
  font-size: clamp(3.1rem, 6vw, 5.3rem);
  line-height: 0.92;
}
h2 { margin: 0; font-size: clamp(2rem, 3vw, 2.7rem); line-height: 1.05; }
.byline {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 22px 0 0;
  color: var(--text);
  font-weight: 460;
}
.byline a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--gold);
  color: #1c1408;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.byline a::after { content: " ↗"; }
.byline a:hover { filter: brightness(1.08); }
.lede {
  max-width: 38rem;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.5;
}
.lede.slim { font-size: 1.02rem; }
.hero-actions { display: flex; gap: 12px; margin-top: 28px; }
.btn {
  border: 1px solid var(--line-strong);
  background: transparent;
  border-radius: 999px;
  padding: 12px 18px;
  text-decoration: none;
}
.btn.solid { background: var(--gold); color: #1a140c; border-color: var(--gold); font-weight: 580; }
.btn.ghost:hover, .btn.solid:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.55; cursor: wait; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 54px;
}
.cards article {
  padding: 22px 22px 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), transparent 40%), var(--bg-raise);
  min-height: 210px;
}
.cards span {
  display: block;
  margin-bottom: 28px;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 12px;
}
.cards h2 { font-size: 1.7rem; max-width: 12ch; }
.cards p { margin: 14px 0 0; color: var(--muted); line-height: 1.5; }
.stack {
  margin: 28px 0 0;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.quiet { color: var(--faint); font-size: 13px; line-height: 1.5; max-width: 46rem; }

.demo-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.8fr);
  gap: 18px;
  min-height: calc(100vh - 120px);
}
.chat, .trace-panel, .chart-card, .stage-note {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--bg-raise);
}
.chat { display: flex; flex-direction: column; min-height: 680px; box-shadow: var(--shadow); }
.chat-top, .trace-head, .eval-head, .chart-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-end;
}
.chat-top, .trace-head { padding: 22px 22px 0; }
.chat-top h2, .trace-head p, .status-line { margin: 0; }
.status-line, #trace-caption, #chart-note {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.45;
  text-align: right;
  max-width: 28rem;
}
.prompts { display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 22px 0; }
.prompts button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 8px 12px;
  text-align: left;
}
.prompts button:hover, .prompts button.is-on { border-color: var(--gold); color: var(--text); }
.thread { flex: 1; overflow: auto; padding: 18px 22px; display: flex; flex-direction: column; gap: 16px; }
.empty { color: var(--muted); max-width: 36rem; line-height: 1.5; margin-top: 12px; }
.bubble { max-width: 92%; line-height: 1.55; }
.bubble.user {
  align-self: flex-end;
  background: var(--gold-dim);
  border: 1px solid rgba(228, 196, 138, 0.35);
  border-radius: 16px 16px 4px 16px;
  padding: 12px 14px;
}
.bubble.desk { align-self: stretch; }
.bubble.desk h3 { margin: 18px 0 8px; font-size: 1.25rem; }
.bubble.desk p { margin: 0 0 10px; }
.cite-mark {
  border: 0;
  margin: 0 1px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--gold-dim);
  color: var(--gold);
  font-family: var(--mono);
  font-size: 11px;
  vertical-align: super;
}
.ratio {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
  margin: 8px 0 16px;
}
.ratio-card, .single-ratio {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
}
.ratio-card strong, .single-ratio strong {
  display: block;
  margin-top: 6px;
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 560;
  letter-spacing: -0.04em;
}
.ratio-card em, .single-ratio em { font-style: normal; color: var(--faint); font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
.ratio-card.bad strong, .single-ratio.bad strong { color: var(--coral); }
.ratio-card.good strong, .single-ratio.good strong { color: var(--mint); }
.delta {
  align-self: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
}
.groups { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 14px; }
.groups section, .cite-card, .check {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(0,0,0,0.15);
}
.groups h3 { margin: 0 0 8px; font-size: 1.15rem; }
.groups li { margin: 0 0 8px; color: var(--muted); }
.citations { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.cite-card header { display: flex; justify-content: space-between; gap: 8px; color: var(--gold); font-family: var(--mono); font-size: 11px; }
.cite-card p { margin: 8px 0 0; color: var(--muted); }
.cite-card.is-hot { border-color: var(--gold); }
.review-line { margin-top: 12px; color: var(--muted); font-size: 0.95rem; }
.checks { margin: 8px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 6px; }
.check { display: flex; justify-content: space-between; gap: 12px; }
.check b { font-weight: 460; }
.check span { color: var(--mint); font-family: var(--mono); font-size: 11px; }
.check.fail span { color: var(--coral); }
.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--line);
}
textarea {
  resize: none;
  border: 1px solid var(--line);
  background: var(--bg-sunken);
  border-radius: 14px;
  padding: 12px 14px;
  outline: none;
}
textarea:focus { border-color: var(--gold); }

.trace-panel { padding-bottom: 18px; }
.trace { list-style: none; margin: 8px 0 0; padding: 8px 22px 0; }
.trace li {
  position: relative;
  padding: 0 0 22px 22px;
  opacity: 0.35;
}
.trace li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}
.trace li:last-child::before { display: none; }
.trace li i {
  position: absolute;
  left: 0;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--faint);
  box-shadow: 0 0 0 4px var(--bg-raise);
}
.trace li.is-on { opacity: 1; }
.trace li.is-on i { background: var(--gold); }
.trace li.is-on.abstained i, .trace li.abstained i { background: var(--coral); }
.trace li.is-on.cleared i { background: var(--mint); }
.trace strong { display: block; font-weight: 580; }
.trace p { margin: 4px 0 0; color: var(--muted); font-size: 0.92rem; line-height: 1.4; }
.trace li.wait i { animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { transform: scale(1.35); } }

.arch-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.7fr);
  gap: 28px;
  align-items: start;
}
.arch { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-top: 28px; }
.split { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; width: min(100%, 760px); }
.node {
  width: min(100%, 280px);
  border: 1px solid var(--line-strong);
  background: var(--bg-raise);
  border-radius: 14px;
  padding: 14px 12px;
  text-align: center;
}
.split .node { width: 100%; }
.node.minor { color: var(--muted); background: transparent; }
.node.final { border-color: var(--gold); color: var(--gold); }
.node.is-hot, .node:hover { background: var(--gold-dim); border-color: var(--gold); color: var(--text); }
.down {
  width: 1px;
  height: 18px;
  background: var(--line-strong);
  display: block;
}
.stage-note { position: sticky; top: 92px; padding: 22px; min-height: 220px; }
.stage-note h3 { margin: 0 0 10px; font-size: 2rem; }
.stage-note p { margin: 0; color: var(--muted); line-height: 1.55; }

.eval-head { align-items: end; margin-bottom: 22px; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.metric {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--bg-raise);
  min-height: 168px;
}
.metric b {
  display: block;
  margin: 18px 0 8px;
  font-family: var(--serif);
  font-size: 2.8rem;
  font-weight: 560;
  letter-spacing: -0.04em;
  color: var(--gold);
}
.metric p { margin: 0; color: var(--muted); line-height: 1.4; font-size: 0.95rem; }
.chart-card { margin-top: 16px; padding: 20px 22px 24px; }
.chart-head { margin-bottom: 18px; display: block; }
.chart-head h3 { margin: 0; font-size: 1.6rem; }
#chart-note {
  margin: 12px 0 0;
  max-width: 44rem;
  text-align: left;
  font-family: var(--sans);
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--muted);
}
.colophon {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  padding: 8px 32px 28px;
  max-width: 1180px;
  margin: 0 auto;
  color: var(--faint);
  font-size: 13px;
}
.colophon p { margin: 0; }
.colophon a { color: var(--muted); text-decoration: none; }
.colophon a::after { content: " ↗"; }
.series { display: grid; grid-template-columns: 150px 1fr; gap: 8px 14px; align-items: center; margin-top: 14px; }
.series span { color: var(--muted); font-size: 0.92rem; }
.bars { display: flex; flex-direction: column; gap: 5px; }
.bar-row { display: grid; grid-template-columns: 92px 1fr 52px; gap: 8px; align-items: center; color: var(--faint); font-family: var(--mono); font-size: 11px; }
.bar { height: 7px; border-radius: 99px; background: rgba(255,255,255,0.06); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--faint); border-radius: inherit; }
.bar-row.agentic { color: var(--gold); }
.bar-row.agentic i { background: var(--gold); }
.bar-row.hybrid i { background: #8aa8b5; }
.bar-row.basic i { background: #6f7d74; }

.quote {
  margin: 0 0 14px;
  padding: 12px 14px;
  border-left: 2px solid var(--gold);
  color: var(--muted);
}
.drawers { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 12px; }
.drawers button { border: 1px solid var(--line-strong); background: transparent; border-radius: 999px; padding: 8px 12px; }
.drawers button.is-on { border-color: var(--gold); color: var(--gold); }
.panel { display: none; margin-bottom: 12px; }
.panel.is-on { display: block; }
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.calc-grid dl, .reason { margin: 0; }
.calc-grid div, .reason li {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(0,0,0,0.15);
}
.calc-grid h3 { margin: 0 0 10px; font-size: 1.2rem; }
.calc-grid dl { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; }
.calc-grid dt { color: var(--muted); }
.calc-grid dd { margin: 0; font-family: var(--mono); }
.reason { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.reason strong { display: block; }
.reason span { color: var(--muted); }
.claims { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.claim {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.15);
}
.claim i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 12px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
}
.claim.ok i { color: var(--mint); background: rgba(158, 211, 184, 0.12); }
.claim.warn i { color: var(--gold); background: var(--gold-dim); }
.claim.bad i { color: var(--coral); background: rgba(231, 163, 148, 0.12); }
.claim b { display: block; font-weight: 580; }
.claim p { margin: 4px 0 0; color: var(--muted); }

@media (max-width: 980px) {
  .nav { flex-wrap: wrap; padding: 14px 16px; }
  .nav-links { order: 3; width: 100%; overflow: auto; }
  .view { padding: 28px 16px 56px; }
  .cards, .metric-grid, .demo-shell, .arch-layout, .groups, .ratio, .calc-grid { grid-template-columns: 1fr; }
  .chat { min-height: 0; }
  .status-line, #trace-caption { text-align: left; }
  h1 { max-width: none; }
  .split { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .trace li.wait i { animation: none; }
  html { scroll-behavior: auto; }
}