:root {
  color-scheme: light;
  --ink: #173a35;
  --muted: #526a64;
  --accent: #006d5b;
  --line: #d7e1d9;
  --paper: #fbfcf8;
  font: 16px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); }
a { color: var(--accent); text-underline-offset: 4px; }
button, textarea, input { font: inherit; }
button, a, summary, input { touch-action: manipulation; }
button, summary { cursor: pointer; }
:focus-visible { outline: 3px solid #bc6900; outline-offset: 4px; }
.site-header { display: flex; align-items: center; gap: 2rem; padding: 1.2rem 5%; border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); font-size: 1.65rem; font-weight: 850; text-decoration: none; letter-spacing: -1px; }
.brand span { color: var(--accent); font-weight: 400; }
.header-note { flex: 1; color: var(--muted); font-size: .9rem; }
main, footer { max-width: 1240px; margin: auto; padding: 0 2rem; }
.network-status { display: flex; align-items: flex-start; gap: .75rem; margin-top: 1.5rem; padding: 1rem 1.25rem; border: 1px solid currentColor; border-radius: 10px; font-size: .85rem; }
.network-status strong, .network-status span:not(.network-dot) { display: block; }
.network-status code { overflow-wrap: anywhere; }
.network-allowed { color: #155b34; background: #e7f5eb; }
.network-denied { color: #982e25; background: #fff0ed; }
.network-dot { flex: 0 0 .7rem; width: .7rem; height: .7rem; border-radius: 50%; background: currentColor; margin-top: .35rem; }
.hero { padding: 4.5rem 0 2.5rem; }
.eyebrow { color: var(--accent); font-size: .8rem; letter-spacing: .14em; font-weight: 750; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 4.5rem); line-height: 1.1; letter-spacing: -.045em; margin-bottom: 1.5rem; }
h1 span { color: var(--accent); }
h2 { font-size: 1.25rem; line-height: 1.35; }
h3 { font-size: 1rem; }
.intro { max-width: 650px; color: var(--muted); font-size: 1.15rem; }
.steps { display: flex; gap: 2rem; flex-wrap: wrap; margin-top: 2rem; font-size: .9rem; }
.demo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.demo-card { display: flex; flex-direction: column; padding: 1.6rem; border: 1px solid var(--line); border-radius: 14px; background: white; text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.demo-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.demo-card h2 { margin: 1.3rem 0 .7rem; }
.demo-card p { color: var(--muted); }
.card-link { margin-top: auto; font-size: .9rem; font-weight: 650; color: var(--accent); }
.tag { display: inline-block; align-self: flex-start; background: #e7f2eb; color: #1b594b; font-size: .74rem; padding: .2rem .65rem; border-radius: 20px; font-weight: 650; }
.callout { margin: 2rem 0; padding: 1.5rem 2rem; border-left: 3px solid var(--accent); background: #edf3ec; border-radius: 0 12px 12px 0; }
.callout p, .lesson p { margin: .4rem 0 0; }
footer { color: var(--muted); font-size: .8rem; padding-top: 2rem; padding-bottom: 2rem; margin-top: 3rem; border-top: 1px solid var(--line); }
.demo-nav { display: flex; flex-wrap: wrap; gap: .6rem 1.2rem; padding: 1.5rem 0; font-size: .8rem; }
.demo-nav a { color: var(--muted); text-decoration: none; }
.demo-nav [aria-current] { color: var(--accent); font-weight: 750; text-decoration: underline; }
.page-heading { padding-top: 1.8rem; }
.page-heading h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
.lesson { padding: 1rem 1.3rem; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 1.5rem; }
.workspace { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: start; }
.panel { background: white; border: 1px solid var(--line); border-radius: 14px; padding: 1.5rem; min-width: 0; }
.panel-heading { display: flex; justify-content: space-between; align-items: baseline; gap: .6rem; }
.panel-heading h2 { font-size: 1rem; }
.panel-heading h3 { margin-bottom: .6rem; }
.examples { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0 1.5rem; }
button { border-radius: 7px; padding: .65rem 1rem; border: 1px solid var(--line); }
.secondary { background: var(--paper); color: var(--ink); font-size: .8rem; padding: .4rem .8rem; }
.primary { background: var(--accent); color: white; border-color: var(--accent); width: 100%; font-weight: 650; }
button:disabled { opacity: .6; cursor: wait; }
#run:disabled { cursor: not-allowed; }
label { display: block; font-size: .9rem; margin: .5rem 0; font-weight: 650; }
textarea { display: block; width: 100%; padding: 1rem; border: 1px solid #aebfb4; border-radius: 8px; resize: vertical; color: var(--ink); background: var(--paper); }
.input-meta { display: flex; justify-content: space-between; margin: .4rem 0 1rem; font-size: .75rem; color: var(--muted); }
.meta { color: var(--muted); font-size: .8rem; }
#status { color: var(--muted); font-size: .9rem; }
.notice, #status.notice { padding: .75rem; border-radius: 7px; color: #715100; background: #fff3cc; }
.error { margin-top: 1rem; padding: 1rem; color: #982e25; background: #fff0ed; border-radius: 8px; }
details { border-top: 1px solid var(--line); padding-top: 1rem; margin-top: 1.5rem; min-width: 0; }
summary { font-size: .9rem; font-weight: 650; }
.questions article { margin-top: 1.3rem; font-size: .85rem; }
.questions h3 { display: inline; margin-left: .4rem; }
.questions ul { padding-left: 1.2rem; }
.answer { padding: 1rem 0; border-top: 1px solid var(--line); }
.answer-value { font-size: 1.8rem; letter-spacing: -.03em; margin: 0; font-weight: 700; }
.probability { margin-top: .7rem; }
.probability-caption { display: flex; justify-content: space-between; gap: 1rem; font-size: .8rem; }
progress { display: block; width: 100%; height: 9px; margin-top: .4rem; accent-color: var(--accent); border: 0; border-radius: 20px; overflow: hidden; background: #edf1ec; }
progress::-webkit-progress-bar { background: #edf1ec; }
progress::-webkit-progress-value { background: var(--accent); }
progress::-moz-progress-bar { background: var(--accent); }
blockquote { white-space: pre-wrap; overflow-wrap: anywhere; margin: .5rem 0 1.5rem; padding-left: .9rem; border-left: 2px solid var(--line); color: var(--muted); font-size: .85rem; }
.small-heading { margin-top: 1.2rem; margin-bottom: .3rem; font-size: .8rem; }
.decision { background: #edf3ec; padding: 1rem; border-radius: 8px; font-weight: 600; }
.policy { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.policy > p { font-size: .85rem; }
.policy label { font-size: .8rem; }
.policy input { width: 100%; accent-color: var(--accent); }
.inspect-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.inspect-grid details { margin-top: 0; }
pre { background: #16352f; color: #e5f4e9; padding: 1rem; border-radius: 8px; overflow: auto; font-size: .78rem; max-height: 550px; }
.inspector > .meta { margin-top: 1.5rem; }
[hidden] { display: none !important; }
@media (max-width: 900px) {
  .demo-grid { grid-template-columns: repeat(2, 1fr); }
  .header-note { display: none; }
  .site-header { justify-content: space-between; }
}
@media (max-width: 680px) {
  main, footer { padding-left: 1rem; padding-right: 1rem; }
  .hero { padding-top: 2.5rem; }
  .workspace, .demo-grid, .inspect-grid { grid-template-columns: 1fr; }
  .panel { padding: 1rem; }
  .steps { gap: .6rem; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  .demo-card { transition: none; }
}