:root {
  color-scheme: light;
  --canvas: #F8F8F8;
  --white: #FFFFFF;
  --grounded-blue: #070154;
  --highlight-magenta: #F900D3;
  --highlight-blue: #0047FF;
  --dark-gray: #50658E;
  --medium-gray: #CED7E6;
  --light-gray: #E8EEF8;
  --positive: #1DD566;
  --negative: #F52C00;
  --sans: Arial, Helvetica, sans-serif;
  --plex: "IBM Plex Sans", "IBM Plex Mono", Arial, Helvetica, sans-serif;
  --mono: "IBM Plex Mono", "IBM Plex Sans", Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--canvas); color: var(--grounded-blue); font: 400 16px/1.3 var(--sans); }
a { color: var(--highlight-blue); }
button, input, select, textarea { font: inherit; }
button, a, select, textarea, input { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--highlight-magenta); outline-offset: 3px; }

.topbar {
  min-height: 80px; padding: 12px clamp(22px, 6vw, 100px);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  border-bottom: 1px solid var(--medium-gray); background: var(--white);
}
.brand { display: flex; align-items: center; gap: 16px; color: var(--grounded-blue); text-decoration: none; font: 400 14px/1.3 var(--sans); }
.brand-logo { width: 142px; height: auto; display: block; }
.brand strong { font-weight: 700; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; background: var(--grounded-blue); color: var(--white); font: 600 20px/1 var(--sans); }
.breadcrumb { padding: 9px clamp(22px, 6vw, 100px); border-bottom: 1px solid var(--medium-gray); background: var(--light-gray); color: var(--highlight-blue); }
.breadcrumb ol { margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; list-style: none; }
.breadcrumb li { display: flex; align-items: center; gap: 10px; color: var(--highlight-blue); font: 600 13px/1.3 var(--sans); }
.breadcrumb li[aria-current="page"] { font-weight: 700; }
.breadcrumb-separator { color: var(--highlight-blue); font-weight: 700; }
.topbar nav { display: flex; align-items: center; flex-wrap: wrap; gap: 12px clamp(16px, 3vw, 40px); font: 600 16px/1.3 var(--sans); }
.topbar nav a { color: var(--grounded-blue); text-decoration: none; text-underline-offset: 5px; }
.topbar nav a:hover { text-decoration: underline; text-decoration-color: var(--highlight-magenta); text-decoration-thickness: 2px; }

.hero {
  min-height: 445px; display: grid;
  grid-template-columns: minmax(260px, .9fr) minmax(390px, 1.1fr);
  align-items: center; gap: 8%; padding: 56px clamp(22px, 10vw, 150px) 64px;
  background: var(--grounded-blue); color: var(--white);
}
.eyebrow { margin: 0 0 16px; color: var(--highlight-blue); font: 700 15px/1.3 var(--plex); letter-spacing: .1em; text-transform: uppercase; }
.hero .eyebrow { color: var(--highlight-magenta); }
.hero h1 { margin: 0 0 24px; color: var(--white); font: 700 42px/1.2 var(--plex); letter-spacing: .05em; text-transform: uppercase; }
.hero h1 em { color: var(--highlight-magenta); font-style: normal; }
.lede { max-width: 440px; margin: 0 0 24px; color: var(--white); font: 400 18px/1.3 var(--sans); }

.button {
  min-height: 48px; border: 1px solid var(--grounded-blue); border-radius: 80px;
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  padding: 11px 22px; font: 600 16px/1.3 var(--sans); text-align: center;
  text-decoration: none; cursor: pointer; transition: background-color 150ms ease, color 150ms ease;
}
.button:hover:not(:disabled) { background: var(--highlight-blue); border-color: var(--highlight-blue); color: var(--white); }
.button-dark { background: var(--white); border-color: var(--white); color: var(--grounded-blue); }
.button-dark:hover { background: var(--highlight-blue); border-color: var(--highlight-blue); color: var(--white); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button-download { background: var(--highlight-magenta); border-color: var(--highlight-magenta); color: var(--grounded-blue); }
.button-download:hover { background: var(--highlight-blue); border-color: var(--highlight-blue); color: var(--white); }
.hero-visual { width: 100%; max-width: 420px; min-width: 0; margin-inline: auto; display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.hero-illustration { display: block; width: 100%; height: auto; overflow: visible; }
.illustration-notes, .illustration-node { fill: var(--white); stroke: var(--medium-gray); stroke-width: 2; }
.illustration-map { fill: var(--light-gray); stroke: var(--medium-gray); stroke-width: 2; }
.illustration-label { fill: var(--dark-gray); font: 700 11px/1 var(--sans); letter-spacing: .06em; }
.illustration-note-rule { fill: none; stroke: var(--medium-gray); stroke-linecap: square; stroke-width: 5; }
.illustration-flow { fill: none; stroke: var(--highlight-magenta); stroke-width: 3; }
.illustration-connector { fill: none; stroke: var(--highlight-blue); stroke-width: 2; }
.illustration-start, .illustration-end { stroke: var(--highlight-blue); }
.illustration-decision { fill: var(--highlight-magenta); stroke: var(--highlight-magenta); stroke-width: 2; }
.illustration-node-text { fill: var(--grounded-blue); font: 600 11px/1.2 var(--sans); }
.illustration-branch-label { fill: var(--grounded-blue); font: 600 10px/1 var(--sans); }
.visual-caption { color: var(--white); font: 400 14px/1.3 var(--sans); }

.principles { padding: 40px clamp(22px, 10vw, 150px); border-bottom: 1px solid var(--medium-gray); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8%; background: var(--white); }
.principles > div { position: relative; padding-left: 42px; }
.number { position: absolute; top: 1px; left: 0; color: var(--highlight-blue); font: 700 15px/1.3 var(--plex); letter-spacing: .1em; }
.principles strong { font: 700 16px/1.3 var(--sans); }
.principles p { margin: 8px 0 0; color: var(--dark-gray); font: 400 14px/1.3 var(--sans); }

.builder-section { padding: 80px clamp(22px, 10vw, 150px) 96px; }
.section-heading { max-width: 660px; margin-bottom: 36px; }
.section-heading h2, .download-section h2 { margin: 0 0 16px; color: var(--grounded-blue); font: 700 24px/1.2 var(--plex); letter-spacing: .05em; text-transform: uppercase; }
.section-heading > p:last-child { max-width: 560px; margin: 0; color: var(--dark-gray); font: 400 16px/1.3 var(--sans); }
.builder-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 24px; align-items: stretch; }
.builder-form, .output-panel { min-width: 0; padding: 28px; border: 1px solid var(--medium-gray); }
.builder-form { background: var(--white); }
.notes-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.notes-heading .field-label { justify-content: flex-start; }
.demo-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; padding: 6px 0; border: 0; border-bottom: 1px solid var(--highlight-blue); background: transparent; color: var(--highlight-blue); font: 700 14px/1.3 var(--sans); text-align: left; cursor: pointer; }
.demo-button:hover { border-bottom-width: 2px; color: var(--grounded-blue); }
.field-label { display: flex; align-items: center; justify-content: space-between; gap: 12px; font: 700 14px/1.3 var(--sans); }
.required { color: var(--highlight-blue); font: 600 11px/1.3 var(--sans); letter-spacing: .04em; text-transform: uppercase; }
.field-hint { margin: 8px 0 12px; color: var(--dark-gray); font: 400 14px/1.3 var(--sans); }
.builder-form textarea { display: block; width: 100%; min-height: 160px; resize: vertical; padding: 14px; border: 1px solid var(--medium-gray); border-radius: 0; background: var(--white); color: var(--grounded-blue); font: 400 16px/1.3 var(--sans); }
.builder-form textarea::placeholder { color: var(--dark-gray); opacity: 1; }
.demo-status { margin: 0; color: var(--highlight-blue); font: 600 13px/1.3 var(--sans); }
.demo-status:not(:empty) { margin-top: 8px; }
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; margin-top: 20px; }
.field-row > label, .conditional-field > label { display: flex; flex-direction: column; gap: 8px; font: 700 14px/1.3 var(--sans); }
.builder-form select { width: 100%; min-height: 44px; padding: 8px 12px; border: 1px solid var(--medium-gray); border-radius: 0; background: var(--white); color: var(--grounded-blue); font: 400 16px/1.3 var(--sans); }
.builder-form :is(textarea, select, input):disabled { cursor: wait; opacity: .7; }
.conditional-field { margin-top: 16px; padding: 16px; border: 1px solid var(--medium-gray); border-left: 3px solid var(--highlight-blue); background: var(--light-gray); }
.conditional-field .field-hint { margin: 8px 0 0; }
.builder-form fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
.builder-form legend { margin-bottom: 10px; font: 700 14px/1.3 var(--sans); }
.check-option { display: flex; align-items: flex-start; gap: 10px; margin: 8px 0; font: 400 14px/1.3 var(--sans); }
.check-option input { width: 18px; height: 18px; margin: 0; accent-color: var(--highlight-blue); }
.check-option small { display: inline-block; margin-left: 6px; color: var(--dark-gray); font: 400 11px/1.3 var(--sans); letter-spacing: .04em; text-transform: uppercase; }
.button-accent { min-width: 220px; margin-top: 24px; background: var(--grounded-blue); border-color: var(--grounded-blue); color: var(--white); }
.button-accent:hover:not(:disabled) { background: var(--highlight-blue); border-color: var(--highlight-blue); color: var(--white); }
.button-accent:disabled { background: var(--dark-gray); border-color: var(--dark-gray); color: var(--white); cursor: wait; }
.form-note { margin: 12px 0 0; color: var(--dark-gray); font: 400 14px/1.3 var(--sans); }

.output-panel { display: flex; flex-direction: column; min-height: 100%; background: var(--grounded-blue); color: var(--white); }
.output-top { display: flex; align-items: center; gap: 8px; color: var(--white); font: 400 14px/1.3 var(--sans); }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--positive); }
.status-dot[data-state="idle"] { background: var(--highlight-blue); }
.status-dot[data-state="loading"] { background: var(--highlight-magenta); }
.status-dot[data-state="error"] { background: var(--negative); }
.output-panel h3 { margin: 24px 0 8px; color: var(--white); font: 700 20px/1.3 var(--mono); }
.output-intro { margin: 0 0 16px; color: var(--white); font: 400 14px/1.3 var(--sans); }
.output-panel pre { min-height: 190px; max-height: 440px; flex: 1; overflow: auto; margin: 0 0 18px; padding: 16px; border: 1px solid var(--dark-gray); border-radius: 0; background: var(--grounded-blue); color: var(--white); font: 400 13px/1.5 "Cascadia Code", Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.button-light { align-self: flex-start; background: transparent; border-color: var(--white); color: var(--white); }
.button-light:hover:not(:disabled) { background: var(--dark-gray); border-color: var(--white); color: var(--white); }
.button-light:disabled { background: var(--dark-gray); border-color: var(--medium-gray); color: var(--white); cursor: not-allowed; }
.copy-status { min-height: 18px; margin: 10px 0 0; color: var(--positive); font: 400 14px/1.3 var(--sans); }

.download-section { padding: 76px clamp(22px, 10vw, 150px); border-top: 1px solid var(--medium-gray); display: grid; grid-template-columns: minmax(250px, .9fr) minmax(0, 1.1fr); gap: 9%; align-items: center; background: var(--grounded-blue); color: var(--white); }
.download-section .eyebrow { color: var(--highlight-magenta); }
.download-section h2 { color: var(--white); }
.download-intro > p:last-child { max-width: 560px; margin: 0; color: var(--white); font: 400 16px/1.4 var(--sans); }
.download-actions { display: grid; gap: 12px; }
.download-link { min-height: 88px; padding: 18px 20px; border: 2px solid var(--white); display: flex; align-items: center; gap: 16px; background: var(--white); color: var(--grounded-blue); text-decoration: none; transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease; }
.download-link:hover { border-color: var(--highlight-blue); background: var(--light-gray); }
.download-link-primary { border-color: var(--highlight-magenta); background: var(--highlight-magenta); }
.download-link-primary:hover { border-color: var(--highlight-magenta); background: var(--white); }
.download-link:focus-visible { outline-color: var(--highlight-magenta); }
.file-icon { width: 48px; height: 48px; border: 1px solid var(--medium-gray); display: grid; flex: 0 0 auto; place-items: center; background: var(--white); color: var(--grounded-blue); font: 700 12px/1.3 var(--plex); }
.download-link-primary .file-icon { border-color: var(--grounded-blue); background: var(--grounded-blue); color: var(--white); }
.download-link strong, .download-link small { display: block; }
.download-link strong { color: var(--grounded-blue); font: 700 16px/1.3 var(--sans); }
.download-link small { margin-top: 4px; color: var(--dark-gray); font: 400 14px/1.3 var(--sans); }
.download-link-primary small { color: var(--grounded-blue); }
.download-arrow { margin-left: auto; color: var(--highlight-blue); font: 700 24px/1 var(--sans); }
.download-link-primary .download-arrow { color: var(--grounded-blue); }

.site-footer {
  min-height: 140px; padding: 40px clamp(24px, 7vw, 100px) 26px;
  display: grid; align-content: space-between; gap: 18px;
  background: var(--grounded-blue); color: var(--white);
  font: 400 11px/1.3 var(--mono);
}
.site-footer-top, .site-footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer-logo { display: inline-flex; align-items: center; flex: 0 0 auto; }
.site-footer-logo img { display: block; width: 172px; height: auto; }
.site-footer-social { display: flex; align-items: center; justify-content: flex-end; gap: 22px; }
.site-footer-social a { width: 16px; height: 18px; display: inline-flex; align-items: center; justify-content: center; }
.site-footer-social img { display: block; width: auto; height: 16px; }
.site-footer-copyright { margin: 0; color: var(--white); white-space: nowrap; }
.site-footer-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 12px 22px; }
.site-footer a { color: var(--white); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; text-underline-offset: 3px; }
.site-footer a:focus-visible { outline: 2px solid var(--highlight-magenta); outline-offset: 4px; }

@media (max-width: 1000px) {
  .hero { grid-template-columns: minmax(0, .9fr) minmax(350px, 1.1fr); gap: 5%; padding-right: 7vw; padding-left: 7vw; }
  .builder-section, .download-section { padding-right: 7vw; padding-left: 7vw; }
  .builder-grid { grid-template-columns: minmax(0, 1fr); }
  .output-panel { min-height: 300px; }
}
@media (max-width: 760px) {
  .topbar { align-items: flex-start; flex-direction: column; gap: 14px; }
  .topbar nav { width: 100%; gap: 8px 24px; }
  .hero { grid-template-columns: minmax(0, 1fr); gap: 22px; padding: 48px 24px 32px; }
  .hero h1 { font-size: 36px; }
  .hero-visual { max-width: 420px; }
  .principles { grid-template-columns: minmax(0, 1fr); gap: 20px; padding: 32px 24px; }
  .principles > div { min-height: 48px; }
  .builder-section, .download-section { padding-right: 24px; padding-left: 24px; }
  .builder-section { padding-top: 64px; padding-bottom: 72px; }
  .download-section { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .site-footer { padding-right: 24px; padding-left: 24px; }
  .site-footer-top, .site-footer-bottom { align-items: flex-start; flex-direction: column; gap: 20px; }
  .site-footer-social { justify-content: flex-start; }
  .site-footer-links { justify-content: flex-start; }
}
@media (max-width: 480px) {
  .topbar nav { gap: 8px 16px; font-size: 14px; }
  .hero { padding-right: 20px; padding-left: 20px; }
  .hero h1 { font-size: 30px; }
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .notes-heading { align-items: flex-start; flex-direction: column; gap: 4px; }
  .builder-form, .output-panel { padding: 20px; }
  .download-section { padding-top: 64px; padding-bottom: 64px; }
  .download-link { min-height: 80px; gap: 10px; padding: 12px; }
  .download-link strong { font-size: 14px; }
  .download-link small { font-size: 12px; }
  .site-footer { padding: 28px 20px 24px; }
  .site-footer-top, .site-footer-bottom { gap: 18px; }
  .site-footer-links { column-gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}