:root {
  /* Primitive surfaces (shared with krews.sh) */
  --paper: #f2f2ef;
  --paper-raised: #f8f8f6;
  --paper-sunk: #e8e8e4;
  --night: #09090b;
  --night-raised: #131316;
  --night-sunk: #050506;
  --ink: #0b0b0c;
  --ink-2: #0b0b0ca8;
  --ink-3: #0b0b0c94;
  --ink-4: #0b0b0c29;
  --line: #0b0b0c17;
  --line-strong: #0b0b0c29;
  --pearl: #efebe4;
  --pearl-2: #efebe4a8;
  --pearl-3: #efebe48f;
  --pearl-4: #efebe429;
  --pearl-line: #efebe417;
  --pearl-line-strong: #efebe429;
  --signal: #ff5a1f;
  --signal-soft: #ff5a1f24;
  --signal-ink: #c2410c;
  --ok: #2f9e6a;

  /* Semantic tokens (default = light) */
  --bg: var(--paper);
  --bg-raised: var(--paper-raised);
  --bg-sunk: var(--paper-sunk);
  --fg: var(--ink);
  --fg-2: var(--ink-2);
  --fg-3: var(--ink-3);
  --fg-4: var(--ink-4);
  --rule: var(--line);
  --rule-strong: var(--line-strong);
  --glass-fill: #ffffff8f;
  --glass-edge: #ffffffb3;
  --glass-shade: #0b0b0c0f;
  --error-surface: color-mix(in oklab, #c2410c 8%, var(--bg));
  --error-border: color-mix(in oklab, #c2410c 35%, transparent);
  --error-text: #9a3412;

  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --t-h1: clamp(2.1rem, 1.3rem + 3vw, 3.4rem);
  --t-h2: clamp(1.35rem, 1.1rem + 1vw, 1.85rem);
  --t-lead: clamp(1.05rem, 1rem + 0.3vw, 1.22rem);
  --t-micro: 0.72rem;
  --gutter: clamp(1rem, 0.6rem + 2vw, 2.5rem);
  --max: 1080px;
  --r-sm: 10px;
  --r-md: 16px;
  --r-pill: 999px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.25, 0.1, 0.25, 1);
  --dur-1: 0.16s;
  --dur-2: 0.32s;
  --dur-3: 0.64s;
  --nav-h: 64px;
  --logo-h: 22px;
  color-scheme: light;
}

[data-theme="light"] {
  --bg: var(--paper);
  --bg-raised: var(--paper-raised);
  --bg-sunk: var(--paper-sunk);
  --fg: var(--ink);
  --fg-2: var(--ink-2);
  --fg-3: var(--ink-3);
  --fg-4: var(--ink-4);
  --rule: var(--line);
  --rule-strong: var(--line-strong);
  --glass-fill: #ffffff8f;
  --glass-edge: #ffffffb3;
  --glass-shade: #0b0b0c0f;
  --signal-ink: #c2410c;
  --error-surface: color-mix(in oklab, #c2410c 8%, var(--bg));
  --error-border: color-mix(in oklab, #c2410c 35%, transparent);
  --error-text: #9a3412;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: var(--night);
  --bg-raised: var(--night-raised);
  --bg-sunk: var(--night-sunk);
  --fg: var(--pearl);
  --fg-2: var(--pearl-2);
  --fg-3: var(--pearl-3);
  --fg-4: var(--pearl-4);
  --rule: var(--pearl-line);
  --rule-strong: var(--pearl-line-strong);
  --glass-fill: #1c1c2080;
  --glass-edge: #ffffff1a;
  --glass-shade: #0006;
  --signal-ink: var(--signal);
  --error-surface: color-mix(in oklab, #ff8a80 10%, var(--bg));
  --error-border: color-mix(in oklab, #ff8a80 32%, transparent);
  --error-text: #ffb4a8;
  color-scheme: dark;
}

@font-face {
  font-family: "Geist";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/npm/geist@1.3.1/dist/fonts/geist-sans/Geist-Variable.woff2") format("woff2");
}
@font-face {
  font-family: "Geist Mono";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/npm/geist@1.3.1/dist/fonts/geist-mono/GeistMono-Variable.woff2") format("woff2");
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  background: var(--bg);
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
  transition:
    background-color var(--dur-2) var(--ease-out),
    color var(--dur-2) var(--ease-out);
}
::selection {
  background: var(--fg);
  color: var(--bg);
}
a {
  color: inherit;
}
button,
input {
  font: inherit;
}
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.site-header {
  z-index: 50;
  pointer-events: none;
  color: var(--fg);
  background: transparent;
  position: fixed;
  inset: 0 0 auto;
}
.site-nav-bar {
  padding: 12px var(--gutter) 0;
  justify-content: center;
  display: flex;
}
.site-nav-pill {
  pointer-events: auto;
  border-radius: var(--r-pill);
  width: 100%;
  max-width: 880px;
  height: 56px;
  transition:
    background-color var(--dur-3) var(--ease-out),
    box-shadow var(--dur-3) var(--ease-out),
    color var(--dur-3) var(--ease-out);
  align-items: center;
  gap: 8px;
  padding: 0 8px 0 18px;
  display: flex;
}
.site-nav-pill:not(.is-scrolled) {
  --glass-fill: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  background: transparent;
}
.glass {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(22px) saturate(170%);
  backdrop-filter: blur(22px) saturate(170%);
  box-shadow:
    inset 0 0 0 1px var(--glass-edge),
    inset 0 1px 0 0 #ffffff59,
    0 1px 1px var(--glass-shade),
    0 18px 40px -22px var(--glass-shade);
  position: relative;
}
.site-nav-logo {
  border-radius: var(--r-sm);
  align-items: center;
  height: 40px;
  margin-right: auto;
  padding-right: 8px;
  display: inline-flex;
  text-decoration: none;
}
/* Theme-aware Krews mark via CSS mask (same official PNG asset). */
.brand-mark {
  display: block;
  width: 86px;
  height: var(--logo-h);
  background: var(--fg);
  -webkit-mask-image: url("/krews_logo.png");
  mask-image: url("/krews_logo.png");
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: left center;
  mask-position: left center;
  -webkit-mask-size: contain;
  mask-size: contain;
  transition: background-color var(--dur-2) var(--ease-out);
}
.site-nav-links {
  align-items: center;
  gap: 2px;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav-link {
  border-radius: var(--r-pill);
  height: 38px;
  color: var(--fg-2);
  transition: color var(--dur-2) var(--ease-out);
  align-items: center;
  padding: 0 14px;
  font-size: 0.9rem;
  display: inline-flex;
  position: relative;
  text-decoration: none;
}
.site-nav-link:hover,
.site-nav-link[aria-current="page"] {
  color: var(--fg);
}
.site-nav-link-label {
  position: relative;
}
.site-nav-cta {
  border-radius: var(--r-pill);
  background: var(--fg);
  height: 40px;
  color: var(--bg);
  transition:
    transform var(--dur-2) var(--ease-out),
    background-color var(--dur-3) var(--ease-out),
    color var(--dur-3) var(--ease-out);
  align-items: center;
  margin-left: 8px;
  padding: 0 16px;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  text-decoration: none;
}
.site-nav-cta:active {
  transform: scale(0.96);
}
.site-nav-menu {
  border: 0;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  border-radius: 50%;
  place-items: center;
  width: 44px;
  height: 44px;
  display: none;
  padding: 0;
}
.site-nav-menu:hover {
  color: var(--fg);
  background: var(--rule);
}
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  padding: 0;
  border: 0;
  color: var(--fg-2);
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  flex: 0 0 36px;
  position: relative;
  transition:
    color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out),
    background-color var(--dur-2) var(--ease-out);
}
.theme-toggle:hover {
  color: var(--fg);
  box-shadow: inset 0 0 0 1px var(--fg-4);
  background: color-mix(in oklab, var(--fg) 4%, transparent);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}
.theme-toggle-icons {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
}
.theme-icon {
  grid-area: 1 / 1;
  opacity: 0;
  transform: scale(0.86) rotate(-8deg);
  transition:
    opacity var(--dur-2) var(--ease-out),
    transform var(--dur-2) var(--ease-out);
  pointer-events: none;
}
.theme-toggle[data-mode="system"] .theme-icon-system,
.theme-toggle[data-mode="light"] .theme-icon-light,
.theme-toggle[data-mode="dark"] .theme-icon-dark {
  opacity: 1;
  transform: none;
}
.theme-toggle::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  translate: -50% 0;
  padding: 4px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg);
  background: var(--bg-raised);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-1) var(--ease-out);
  z-index: 5;
}
.theme-toggle:hover::after,
.theme-toggle:focus-visible::after {
  opacity: 1;
}

.site-nav-sheet {
  pointer-events: auto;
  position: fixed;
  inset: 0;
  z-index: 60;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}
.site-nav-sheet-panel {
  min-height: 100%;
  padding: 12px var(--gutter) 40px;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  background: var(--bg);
  color: var(--fg);
}
.site-nav-sheet-bar {
  justify-content: space-between;
  align-items: center;
  height: 56px;
  padding: 0 6px 0 18px;
  display: flex;
}
.site-nav-sheet-links {
  flex: 1;
  align-content: start;
  margin-top: 1.5rem;
  gap: 4px;
  padding-inline: 4px;
  display: grid;
}
.site-nav-sheet-link {
  letter-spacing: -0.04em;
  padding-block: 4px;
  font-size: clamp(2.6rem, 11vw, 4rem);
  font-weight: 540;
  line-height: 1.05;
  display: block;
  color: inherit;
  text-decoration: none;
}
.site-nav-sheet-link[aria-current="page"] {
  color: var(--fg-3);
}
.site-nav-sheet-foot {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  color: var(--fg-2);
  padding-inline: 4px;
  margin: 0;
}
html.nav-sheet-open,
html.nav-sheet-open body {
  overflow: hidden;
}

.hero-status {
  margin-bottom: 1.15rem;
}
.status-chip {
  height: 28px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.04em;
  color: var(--fg-2);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px 0 11px;
  white-space: nowrap;
}
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  position: relative;
}
.status-dot::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--signal);
  opacity: 0.35;
  animation: ping 1.8s var(--ease-out) infinite;
}

.page {
  width: min(100% - var(--gutter) * 2, var(--max));
  margin: 0 auto;
  padding: calc(var(--nav-h) + 2.5rem) 0 5rem;
}

.kicker {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1.1rem;
}
.kicker .rule {
  width: 24px;
  height: 1px;
  background: var(--fg-4);
}

.hero h1 {
  font-size: var(--t-h1);
  font-weight: 560;
  letter-spacing: -0.045em;
  line-height: 1.05;
  margin: 0 0 0.55rem;
}
.eyebrow {
  margin: 0 0 1.1rem;
  color: var(--signal-ink);
  font-weight: 500;
}
.lead,
.note {
  max-width: 38rem;
  margin: 0 0 0.85rem;
}
.lead {
  color: var(--fg-2);
  font-size: var(--t-lead);
}
.note {
  color: var(--fg-3);
  font-size: 0.95rem;
  margin-bottom: 1.75rem;
}

.composer {
  max-width: 40rem;
  display: grid;
  gap: 0.85rem;
}
.composer-label {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.composer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  align-items: stretch;
}
.composer input {
  height: 48px;
  border: 0;
  border-radius: var(--r-sm);
  background: var(--bg-raised);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  padding: 0 14px;
  color: var(--fg);
  color-scheme: inherit;
}
.composer input::placeholder {
  color: var(--fg-3);
}
.composer button[type="submit"],
.actions button,
.prompt-chip,
.back-btn {
  border: 0;
  cursor: pointer;
  border-radius: var(--r-pill);
  transition:
    transform var(--dur-2) var(--ease-out),
    background-color var(--dur-3) var(--ease-out),
    color var(--dur-3) var(--ease-out),
    box-shadow var(--dur-3) var(--ease-out);
}
.composer button[type="submit"] {
  height: 48px;
  padding: 0 18px;
  background: var(--fg);
  color: var(--bg);
  font-weight: 500;
  font-size: 0.92rem;
}
.composer button[type="submit"]:hover {
  transform: translateY(-1px);
}
.composer button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}
.prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.prompt-chip {
  height: 32px;
  padding: 0 12px;
  background: transparent;
  color: var(--fg-2);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  font-size: 0.82rem;
}
.prompt-chip:hover {
  color: var(--fg);
  box-shadow: inset 0 0 0 1px var(--fg-4);
}

.stage {
  margin-top: 2.75rem;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition:
    opacity var(--dur-3) var(--ease-out),
    transform var(--dur-3) var(--ease-out);
}
.stage.is-open {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.pipeline-shell {
  position: relative;
  background: var(--bg-raised);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  border-radius: var(--r-md);
  padding: 1.25rem 1rem 1.1rem;
  overflow: hidden;
}
.pipeline-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
  padding: 0 0.35rem;
}
.pipeline-head h2 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-weight: 400;
}
.pipeline-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-3);
}

.diagram {
  position: relative;
  min-height: 320px;
}
.diagram svg.wires {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.wires path {
  fill: none;
  stroke: var(--rule-strong);
  stroke-width: 1.25;
  transition: stroke var(--dur-3) var(--ease-out);
}
.wires path.is-active {
  stroke: var(--signal);
}
.wires path.is-done {
  stroke: var(--fg-4);
}
.packet {
  fill: var(--signal);
  opacity: 0;
  pointer-events: none;
}

.nodes {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  grid-template-rows: auto auto auto;
  gap: 1rem 0.65rem;
  align-items: center;
}
.node {
  appearance: none;
  border: 0;
  text-align: left;
  background: var(--bg);
  color: var(--fg);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  border-radius: 8px;
  padding: 0.7rem 0.75rem;
  cursor: pointer;
  min-height: 72px;
  display: grid;
  gap: 0.2rem;
  transition:
    transform var(--dur-2) var(--ease-soft),
    box-shadow var(--dur-3) var(--ease-out),
    background-color var(--dur-3) var(--ease-out);
}
.node:hover {
  transform: translateY(-1px);
  box-shadow: inset 0 0 0 1px var(--fg-4);
}
.node .label {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.node .value {
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--fg-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.node .state {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--fg-3);
}
.node[data-state="waiting"] .state {
  color: var(--fg-2);
}
.node[data-state="active"] {
  box-shadow: inset 0 0 0 1.5px var(--signal);
}
.node[data-state="active"] .state {
  color: var(--signal-ink);
}
.node[data-state="complete"] .state {
  color: var(--ok);
}
.node[data-state="error"] {
  box-shadow: inset 0 0 0 1.5px #c2410c;
}
.node[data-state="error"] .state {
  color: #c2410c;
}
.node[data-state="skipped"] .value,
.node[data-state="skipped"] .state {
  color: var(--fg-3);
}

.node-request {
  grid-column: 1;
  grid-row: 2;
}
.node-agent {
  grid-column: 2;
  grid-row: 2;
}
.node-knowledge {
  grid-column: 3;
  grid-row: 1;
}
.node-context {
  grid-column: 3;
  grid-row: 2;
}
.node-rules {
  grid-column: 3;
  grid-row: 3;
}
.node-tools {
  grid-column: 4;
  grid-row: 3;
}
.node-model {
  grid-column: 4;
  grid-row: 2;
}
.node-persist {
  grid-column: 5;
  grid-row: 2;
}
.node-response {
  grid-column: 6;
  grid-row: 2;
}

.detail-panel {
  margin-top: 0.9rem;
  display: none;
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--rule);
  border-radius: 8px;
  padding: 0.95rem 1rem;
}
.detail-panel.is-open {
  display: block;
  animation: rise var(--dur-3) var(--ease-out);
}
.detail-panel h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  letter-spacing: -0.02em;
}
.detail-panel p {
  margin: 0 0 0.75rem;
  color: var(--fg-2);
  font-size: 0.92rem;
}
.detail-rows {
  display: grid;
  gap: 0;
}
.detail-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
}
.detail-row:first-child {
  border-top: 0;
  padding-top: 0;
}
.detail-row dt {
  color: var(--fg-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.detail-row dd {
  margin: 0;
  text-align: right;
  font-weight: 500;
}
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.35rem;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  padding: 0.28rem 0.55rem;
  border-radius: var(--r-pill);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  color: var(--fg-2);
}
.chip.is-hit {
  color: var(--signal-ink);
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--signal) 55%, transparent);
  background: var(--signal-soft);
}
.chip.is-miss {
  opacity: 0.55;
}
.back-btn {
  margin-top: 0.85rem;
  height: 34px;
  padding: 0 12px;
  background: transparent;
  color: var(--fg-2);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  font-size: 0.82rem;
}

.response-card {
  margin-top: 1rem;
  display: none;
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  border-radius: 8px;
  padding: 1rem 1.05rem;
}
.response-card.is-open {
  display: block;
  animation: rise var(--dur-3) var(--ease-out);
}
.response-card .label {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 0.45rem;
}
.response-card .body {
  font-size: 1rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.85rem;
  white-space: pre-wrap;
}
.response-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--fg-3);
}
.actions {
  margin-top: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.actions button {
  height: 36px;
  padding: 0 14px;
  background: transparent;
  color: var(--fg);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  font-size: 0.85rem;
}
.actions button.primary {
  background: var(--fg);
  color: var(--bg);
  box-shadow: none;
}
.actions button:hover {
  transform: translateY(-1px);
}

.trace {
  margin-top: 0.85rem;
  display: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--fg-2);
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--rule);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  white-space: pre-wrap;
}
.trace.is-open {
  display: block;
}

.error-banner {
  display: none;
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  background: var(--error-surface);
  box-shadow: inset 0 0 0 1px var(--error-border);
  color: var(--error-text);
  font-size: 0.92rem;
}
.error-banner.is-open {
  display: block;
}

.explain {
  margin-top: 4.5rem;
  display: grid;
  gap: 1.35rem;
}
.explain > header h2 {
  margin: 0 0 0.4rem;
  font-size: var(--t-h2);
  letter-spacing: -0.03em;
}
.explain > header p {
  margin: 0;
  color: var(--fg-2);
  max-width: 36rem;
}
.steps {
  display: grid;
  gap: 0;
}
.step {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--rule);
}
.step:first-child {
  border-top: 0;
}
.step .idx {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  color: var(--fg-3);
  padding-top: 0.2rem;
}
.step h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.step p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.95rem;
  max-width: 34rem;
}

.status-block {
  margin-top: 3.5rem;
  max-width: 28rem;
}
.status-block h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-weight: 400;
}
.status-rows {
  display: grid;
}
.status-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--rule);
  font-size: 0.92rem;
}
.status-row:first-child {
  border-top: 0;
  padding-top: 0;
}
.status-row dt {
  color: var(--fg-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.status-row dd {
  margin: 0;
  font-weight: 500;
}
.status-row .ok {
  color: var(--ok);
}

.disclaimer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 0.55rem;
  max-width: 36rem;
}
.disclaimer p {
  margin: 0;
  color: var(--fg-3);
  font-size: 0.92rem;
}
.site-foot {
  margin-top: 2rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.site-foot p {
  margin: 0;
  color: var(--fg-3);
  font-size: 0.9rem;
}
.site-foot a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  border-bottom: 1px solid var(--fg-4);
  padding-bottom: 2px;
  transition: border-color var(--dur-2) var(--ease-out);
}
.site-foot a:hover {
  border-color: var(--fg);
}

.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;
}

@keyframes ping {
  0% {
    transform: scale(0.6);
    opacity: 0.55;
  }
  100% {
    transform: scale(2.2);
    opacity: 0;
  }
}
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 860px) {
  .nodes {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    gap: 0.55rem;
  }
  .node-request,
  .node-agent,
  .node-knowledge,
  .node-context,
  .node-rules,
  .node-tools,
  .node-model,
  .node-persist,
  .node-response {
    grid-column: 1;
    grid-row: auto;
  }
  .diagram {
    min-height: 0;
  }
  .diagram svg.wires {
    display: none;
  }
  .composer-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-nav-links,
  .site-nav-cta {
    display: none;
  }
  .site-nav-menu {
    display: grid;
  }
  .site-nav-pill {
    padding-right: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  body,
  .site-nav-pill,
  .brand-mark,
  .theme-toggle,
  .theme-icon,
  .status-dot::after,
  .stage,
  .detail-panel,
  .response-card,
  .node,
  .composer button,
  .actions button,
  .prompt-chip {
    animation: none !important;
    transition: none !important;
  }
  .packet {
    display: none;
  }
}

/* ——— Immersive shell (v2) ——— */
.shell-page {
  width: min(100% - var(--gutter) * 2, 1180px);
  max-width: 1180px;
  padding-top: calc(var(--nav-h) + 1.25rem);
  padding-bottom: 3rem;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, color-mix(in oklab, var(--signal) 6%, transparent), transparent 55%),
    linear-gradient(180deg, color-mix(in oklab, var(--fg) 2.5%, var(--bg)), var(--bg) 40%);
}

.machine {
  position: relative;
  min-height: calc(100dvh - var(--nav-h) - 2rem);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.machine-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
}

.brand-name {
  margin: 0;
  font-size: clamp(1.65rem, 1.2rem + 1.8vw, 2.45rem);
  font-weight: 560;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.shell-page .pipeline-meta {
  align-self: flex-end;
  font-size: 0.72rem;
}

.shell-page .stage {
  margin-top: 0;
  opacity: 1;
  transform: none;
  pointer-events: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.diagram-v2 {
  position: relative;
  min-height: min(58dvh, 520px);
  background: color-mix(in oklab, var(--bg-raised) 88%, transparent);
  box-shadow: inset 0 0 0 1px var(--rule);
  border-radius: 12px;
  padding: 1rem 0.75rem 1.25rem;
  overflow: hidden;
}

.diagram-v2::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.35;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 78%);
}

.wires.is-idle path {
  stroke-dasharray: 4 10;
  animation: wireDrift 18s linear infinite;
}
@keyframes wireDrift {
  to { stroke-dashoffset: -140; }
}
.wires path.is-skip {
  stroke: var(--fg-4);
  opacity: 0.35;
  stroke-dasharray: 3 6;
}

.nodes-v2 {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: auto auto auto auto;
  gap: 0.75rem 0.55rem;
  align-items: start;
}

.node-block {
  display: grid;
  gap: 0.55rem;
}

.nodes-v2 .node-request { grid-column: 1 / span 3; grid-row: 2; }
.nodes-v2 .node-agent { grid-column: 4 / span 2; grid-row: 2; }
.nodes-v2 .node-cache { grid-column: 6 / span 2; grid-row: 2; }
.nodes-v2 .node-context { grid-column: 8 / span 2; grid-row: 2; }
.nodes-v2 .node-knowledge { grid-column: 8 / span 2; grid-row: 1; }
.nodes-v2 .node-rules { grid-column: 8 / span 1; grid-row: 3; }
.nodes-v2 .node-tools { grid-column: 9 / span 1; grid-row: 3; }
.nodes-v2 .node-router { grid-column: 10 / span 2; grid-row: 1 / span 3; }
.nodes-v2 .node-persist { grid-column: 12 / span 1; grid-row: 2; }
.nodes-v2 .node-response { grid-column: 12 / span 1; grid-row: 3; }

.request-composer {
  display: grid;
  gap: 0.45rem;
}
.request-composer .composer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem;
}
.request-composer input {
  height: 40px;
  border: 0;
  border-radius: 8px;
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  padding: 0 12px;
  color: var(--fg);
  font-size: 0.88rem;
}
.request-composer button[type="submit"] {
  height: 40px;
  padding: 0 14px;
  border: 0;
  border-radius: var(--r-pill);
  background: var(--fg);
  color: var(--bg);
  font-weight: 500;
  font-size: 0.85rem;
  cursor: pointer;
}
.request-composer button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.request-composer .prompts {
  gap: 0.35rem;
}
.request-composer .prompt-chip {
  height: 28px;
  font-size: 0.74rem;
  padding: 0 10px;
}

.router-lanes {
  display: grid;
  gap: 0.4rem;
}
.lane {
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  box-shadow: inset 0 0 0 1px var(--rule);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  display: grid;
  gap: 0.1rem;
  transition: box-shadow var(--dur-3) var(--ease-out), opacity var(--dur-3) var(--ease-out);
}
.lane-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--fg-3);
}
.lane-model {
  font-size: 0.82rem;
  color: var(--fg);
}
.lane-state {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--fg-3);
  text-transform: uppercase;
}
.lane[data-state="active"] {
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--signal) 55%, var(--rule-strong));
}
.lane[data-state="active"] .lane-state {
  color: var(--signal-ink);
}
.lane[data-state="unavailable"],
.lane[data-state="skipped"] {
  opacity: 0.45;
}
.lane[data-state="failed"] {
  box-shadow: inset 0 0 0 1px var(--error-border);
}
.lane[data-state="failed"] .lane-state {
  color: var(--error-text);
}

.cost-panel {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.cost-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--fg-3);
}
.cost-row strong {
  color: var(--fg);
  font-weight: 500;
}

.status-drawer {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: color-mix(in oklab, var(--night) 35%, transparent);
  display: grid;
  place-items: end center;
  padding: 1rem;
}
.status-drawer[hidden] {
  display: none !important;
}
.status-drawer-panel {
  width: min(100%, 420px);
  background: var(--bg-raised);
  color: var(--fg);
  border-radius: 14px;
  box-shadow: inset 0 0 0 1px var(--rule-strong);
  padding: 1rem 1.1rem 1.15rem;
}
.status-drawer-panel header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}
.status-drawer-panel h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 560;
}
.status-note {
  margin: 0.85rem 0 0;
  font-size: 0.78rem;
  color: var(--fg-3);
}

.shell-page .response-card {
  margin-top: 0;
}

@media (max-width: 960px) {
  .diagram-v2 {
    min-height: 0;
  }
  .diagram-v2 svg.wires {
    display: none;
  }
  .nodes-v2 {
    grid-template-columns: 1fr;
    grid-template-rows: none;
  }
  .nodes-v2 .node-request,
  .nodes-v2 .node-agent,
  .nodes-v2 .node-cache,
  .nodes-v2 .node-context,
  .nodes-v2 .node-knowledge,
  .nodes-v2 .node-rules,
  .nodes-v2 .node-tools,
  .nodes-v2 .node-router,
  .nodes-v2 .node-persist,
  .nodes-v2 .node-response {
    grid-column: 1;
    grid-row: auto;
  }
  .node-router .router-lanes {
    grid-template-columns: 1fr 1fr;
  }
  .machine {
    min-height: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wires.is-idle path {
    animation: none;
  }
}