/* intentframe.org — shared styles
   Monospace display type, sans body, one reserved accent.
   The indigo accent is used for exactly two things: interactive state, and
   marking the one path through a frame that reaches a model. Nothing else. */

:root {
  --ink:        #101418;
  --ink-2:      #4a525c;
  --ink-3:      #7b848f;
  --paper:      #ffffff;
  --panel:      #f4f6f8;
  --panel-2:    #eaeef2;
  --rule:       #dfe3e8;
  --accent:     #3a32c8;
  --accent-bg:  #ecebfb;
  --danger:     #a32d2d;
  --danger-bg:  #fbeeee;

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;


  /* Diagram palette. Each hue denotes a runtime layer, not decoration:
     enforce=policy, model=inference, check=validation, route=dispatch,
     orchestrate=what happens next, context=data, observe=telemetry. */
  --dg-enforce-bg:     #fdecec;  --dg-enforce-line:     #c0392b;  --dg-enforce-ink:     #93261b;
  --dg-model-bg:       #ecebfb;  --dg-model-line:       #3a32c8;  --dg-model-ink:       #2c26a0;
  --dg-check-bg:       #fdf3e0;  --dg-check-line:       #b5761a;  --dg-check-ink:       #86580f;
  --dg-route-bg:       #e4f3f3;  --dg-route-line:       #1d7f7f;  --dg-route-ink:       #135b5b;
  --dg-orchestrate-bg: #e8f5ec;  --dg-orchestrate-line: #2e7d4f;  --dg-orchestrate-ink: #1f5c39;
  --dg-context-bg:     #f3ecfa;  --dg-context-line:     #7b3fbf;  --dg-context-ink:     #5c2d92;
  --dg-observe-bg:     #e9eef7;  --dg-observe-line:     #3a5c94;  --dg-observe-ink:     #2a4570;

  --w-page: 1120px;
  --w-prose: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #e9ecef;
    --ink-2:     #a8b1bb;
    --ink-3:     #767f8a;
    --paper:     #0d1014;
    --panel:     #161a20;
    --panel-2:   #1e242c;
    --rule:      #262c34;
    --accent:    #a49dff;
    --accent-bg: #1c1b3a;
    --danger:    #e88b8b;
    --danger-bg: #2a1717;

    --dg-enforce-bg:     #2c1717;  --dg-enforce-line:     #e07a7a;  --dg-enforce-ink:     #f2a6a6;
    --dg-model-bg:       #1d1b3d;  --dg-model-line:       #a49dff;  --dg-model-ink:       #c2bdff;
    --dg-check-bg:       #2d2412;  --dg-check-line:       #dfae5c;  --dg-check-ink:       #f0cb8c;
    --dg-route-bg:       #10292a;  --dg-route-line:       #5cc0c0;  --dg-route-ink:       #8ddada;
    --dg-orchestrate-bg: #152a1d;  --dg-orchestrate-line: #6cc08c;  --dg-orchestrate-ink: #9adcb2;
    --dg-context-bg:     #251a35;  --dg-context-line:     #b58ae0;  --dg-context-ink:     #cfb0f2;
    --dg-observe-bg:     #16202f;  --dg-observe-line:     #7ba0d8;  --dg-observe-ink:     #a8c4ee;

  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  font-feature-settings: "ss02";
}

/* ---------- type ---------- */

h1, h2, h3, h4 {
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0;
}

h1 { font-size: clamp(2.1rem, 5.5vw, 3.1rem); letter-spacing: -0.045em; }
h2 { font-size: clamp(1.35rem, 3vw, 1.75rem); letter-spacing: -0.03em; }
h3 { font-size: 1.0625rem; letter-spacing: -0.01em; }
h4 { font-size: 0.9375rem; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; text-decoration-color: var(--rule); }
a:hover { color: var(--accent); text-decoration-color: currentColor; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}

code, kbd, pre { font-family: var(--mono); }

code {
  font-size: 0.875em;
  background: var(--panel);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  word-break: break-word;
}

pre {
  font-size: 13px;
  line-height: 1.7;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 20px 22px;
  overflow-x: auto;
  margin: 0 0 1.4em;
}
pre code { background: none; padding: 0; font-size: inherit; }

.lede { font-size: 1.1875rem; line-height: 1.6; color: var(--ink-2); }
.small { font-size: 0.9375rem; }
.muted { color: var(--ink-2); }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: block;
  margin-bottom: 14px;
}

/* ---------- layout ---------- */

.wrap { max-width: var(--w-page); margin: 0 auto; padding: 0 28px; }
.prose { max-width: var(--w-prose); }

section { padding: 68px 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: 0; }

.stack > * + * { margin-top: 14px; }

/* ---------- header ---------- */

header.site {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 96%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
header.site .wrap {
  display: flex; align-items: center; gap: 28px;
  min-height: 58px; flex-wrap: wrap;
}
.brand {
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  letter-spacing: -0.02em; text-decoration: none; margin-right: auto;
}
.brand span { color: var(--ink-3); }
nav.site { display: flex; gap: 22px; flex-wrap: wrap; }
nav.site a {
  font-family: var(--mono); font-size: 13px; text-decoration: none;
  color: var(--ink-2); padding: 4px 0;
}
nav.site a:hover { color: var(--accent); }
nav.site a[aria-current="page"] {
  color: var(--ink); box-shadow: inset 0 -1px 0 var(--accent);
}

/* ---------- hero ---------- */

.hero { padding: 84px 0 64px; }
.hero h1 { margin-bottom: 22px; }
.hero .lede { max-width: 660px; }

.meta {
  display: flex; gap: 40px; flex-wrap: wrap;
  margin: 34px 0 30px; padding: 18px 0;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  max-width: 660px;
}
.meta div { display: flex; flex-direction: column; gap: 2px; }
.meta dt, .meta .k {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-3);
}
.meta dd, .meta .v { margin: 0; font-family: var(--mono); font-size: 14px; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: 13px; text-decoration: none;
  padding: 10px 18px; border-radius: 4px; border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper); transition: opacity .12s ease;
}
.btn:hover { opacity: .82; color: var(--paper); }
.btn.ghost { background: none; color: var(--ink); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--ink); color: var(--ink); opacity: 1; }

/* ---------- the fan-out (signature element) ---------- */

.fanout {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 0;
  border: 1px solid var(--rule); border-radius: 6px; overflow: hidden;
}
.fanout .doc { background: var(--panel); padding: 26px 24px; border-right: 1px solid var(--rule); }
.fanout .layers { padding: 26px 24px; }
.fanout .cap {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 16px;
}

.doc .code { font-family: var(--mono); font-size: 12.5px; line-height: 1.9; }
.doc .ln { color: var(--ink-3); }
.doc .ln.nest { padding: 0 6px 0 18px; margin: 0 -6px; }
.fld {
  display: block; cursor: pointer; border-radius: 3px;
  padding: 0 6px 0 18px; margin: 0 -6px;
  transition: background .12s ease, color .12s ease;
}
.fld.nest { padding-left: 34px; }
.fld .key { color: var(--ink); }
.fld .val { color: var(--ink-3); }
.fanout.active .fld { color: var(--ink-3); }
.fanout.active .fld .key { color: var(--ink-3); }
.fld.on, .fanout.active .fld.on { background: var(--accent-bg); }
.fld.on .key, .fld.on .val { color: var(--accent); }

.layer {
  display: block; width: 100%; text-align: left; cursor: pointer; position: relative;
  font-family: var(--mono); font-size: 13px; color: inherit;
  background: none; border: 1px solid var(--rule); border-radius: 4px;
  padding: 11px 13px; margin-bottom: 8px;
  transition: border-color .12s ease, background .12s ease;
}
.layer .sub { display: block; font-size: 11px; color: var(--ink-3); margin-top: 3px; letter-spacing: 0; }
.fanout.active .layer { opacity: .45; }
.layer.on, .fanout.active .layer.on { opacity: 1; border-color: var(--accent); background: var(--accent-bg); color: var(--accent); }
.layer.on .sub { color: var(--accent); }
.layer[data-model="yes"] { padding-right: 132px; }
.layer[data-model="yes"]::after {
  content: "reaches the model"; position: absolute; right: 12px; top: 12px;
  font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 3px;
  padding: 1px 6px;
}
.hint { font-size: 12px; color: var(--ink-3); font-family: var(--mono); margin-top: 14px; }

/* ---------- grids ---------- */

.cols { display: grid; gap: 30px; grid-template-columns: repeat(3, 1fr); }
.cols.two { grid-template-columns: repeat(2, 1fr); }
.cols.four { grid-template-columns: repeat(4, 1fr); gap: 24px; }

.card {
  border: 1px solid var(--rule); border-radius: 5px; padding: 22px 20px;
  background: var(--paper);
}
.card h3 { margin-bottom: 8px; }
.card p { font-size: 0.9375rem; color: var(--ink-2); }

.rule-list { border-top: 1px solid var(--rule); }
.rule-list > div { padding: 20px 0; border-bottom: 1px solid var(--rule); }
.rule-list h3 { margin-bottom: 6px; }
.rule-list p { font-size: 0.9375rem; color: var(--ink-2); margin: 0; }

/* ---------- tables ---------- */

.tbl-scroll { overflow-x: auto; margin-bottom: 1.4em; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td {
  text-align: left; vertical-align: top;
  padding: 11px 14px 11px 0; border-bottom: 1px solid var(--rule);
}
th {
  font-family: var(--mono); font-weight: 500; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3);
  border-bottom-color: var(--ink-3);
}
td:first-child { font-family: var(--mono); font-size: 13px; white-space: nowrap; }
td code { white-space: nowrap; }
.tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .04em;
  border: 1px solid var(--rule); border-radius: 3px; padding: 1px 6px;
  color: var(--ink-2); white-space: nowrap;
}
.tag.req { border-color: var(--ink-3); color: var(--ink); }
.tag.model { border-color: var(--accent); color: var(--accent); background: var(--accent-bg); }
.tag.err { border-color: var(--danger); color: var(--danger); background: var(--danger-bg); }

/* ---------- callout ---------- */

.note {
  border-left: 2px solid var(--accent); background: var(--panel);
  padding: 16px 20px; border-radius: 0 4px 4px 0; margin: 0 0 1.4em;
  font-size: 0.9375rem;
}
.note .eyebrow { margin-bottom: 6px; }

/* ---------- toc ---------- */

.layout-spec { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; align-items: start; }
.toc { position: sticky; top: 86px; font-family: var(--mono); font-size: 12.5px; }
.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.toc li { margin-bottom: 7px; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover { color: var(--accent); }
.toc .n { color: var(--ink-3); margin-right: 8px; }

.spec-section { padding: 0 0 44px; border: 0; }
.spec-section h2 { margin-bottom: 16px; scroll-margin-top: 80px; }
.spec-section h3 { margin: 28px 0 10px; scroll-margin-top: 80px; }
.num { color: var(--ink-3); margin-right: 12px; font-size: 0.8em; vertical-align: 2px; }

/* ---------- footer ---------- */

footer.site {
  border-top: 1px solid var(--rule); padding: 40px 0 60px;
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-3);
}
footer.site a { color: var(--ink-2); }
footer.site .row { display: flex; gap: 22px; flex-wrap: wrap; margin-bottom: 10px; }
footer.site .byline { color: var(--ink-2); margin-bottom: 6px; }
footer.site .byline a { color: var(--ink); text-decoration-color: var(--ink-3); }
footer.site .byline a:hover { color: var(--accent); }


/* ---------- mermaid diagrams ---------- */

figure.diagram { margin: 0 0 1.6em; }

pre.mermaid {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 22px 18px;
  margin: 0;
  overflow-x: auto;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ink-3);          /* source text, shown only until rendered */
  min-height: 90px;
  text-align: center;
}
pre.mermaid.mermaid-ready {
  color: inherit;
  background: var(--panel);
  padding: 22px 14px;
}
pre.mermaid svg { max-width: 100%; height: auto; display: inline-block; }
pre.mermaid.mermaid-failed { text-align: left; }

figure.diagram figcaption {
  font-size: 13px;
  color: var(--ink-2);
  margin-top: 10px;
  padding-left: 2px;
}
figure.diagram figcaption b {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: block;
  margin-bottom: 4px;
}


@media (max-width: 560px) {
  pre.mermaid { padding: 16px 10px; }
}

/* ---------- motion ---------- */

@media (prefers-reduced-motion: no-preference) {
  .hero > .wrap > * { animation: rise .5s cubic-bezier(.2,.7,.3,1) backwards; }
  .hero h1 { animation-delay: .04s; }
  .hero .lede { animation-delay: .1s; }
  .hero .meta { animation-delay: .15s; }
  .hero .actions { animation-delay: .2s; }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } }
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  body { font-size: 16px; }
  .fanout { grid-template-columns: 1fr; }
  .fanout .doc { border-right: 0; border-bottom: 1px solid var(--rule); }
  .cols, .cols.two, .cols.four { grid-template-columns: 1fr; }
  .layout-spec { grid-template-columns: 1fr; gap: 28px; }
  .toc { position: static; border-bottom: 1px solid var(--rule); padding-bottom: 20px; }
  section { padding: 48px 0; }
  .hero { padding: 52px 0 40px; }
  .meta { gap: 26px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 20px; }
  .doc .code { font-size: 11.5px; }
  .layer[data-model="yes"]::after { display: none; }
  nav.site { gap: 16px; }
}