:root {
  --how-amber: #d07a3a;
  --how-blue: #214f7b;
  --how-deep: #152c41;
  --how-fade: rgba(33, 79, 123, .08);
}

.how-site-header { align-items: center; }
.how-site-header .site-nav { display: flex; gap: .9rem; }
.how-site-header .site-nav a[aria-current="page"] { color: var(--how-amber); border-color: var(--how-amber); }

.how-main { padding-top: clamp(2.2rem, 5vw, 5rem); }
.how-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .88fr);
  gap: clamp(2.5rem, 8vw, 8rem);
  align-items: center;
  min-height: 510px;
}
.how-hero-copy { position: relative; }
.how-hero-copy::before {
  content: "";
  position: absolute;
  left: -1.2rem;
  top: -.5rem;
  width: 5px;
  height: 8rem;
  background: var(--how-amber);
}
.how-hero h1 { max-width: 760px; color: var(--how-deep); font-size: clamp(3.7rem, 8vw, 7.4rem); line-height: .83; }
.how-lede { max-width: 650px; margin: 2rem 0 0 2.35rem; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.25rem); }
.how-facts { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: 2.3rem 0 0 2.35rem; }
.how-facts span { display: grid; gap: .15rem; min-width: 7rem; padding-top: .6rem; border-top: 2px solid var(--how-blue); }
.how-facts b { color: var(--how-blue); font: .78rem var(--utility); letter-spacing: .08em; }
.how-facts small { color: var(--muted); font-size: .72rem; }

.signal-panel {
  position: relative;
  min-height: 390px;
  padding: 1.3rem;
  overflow: hidden;
  border: 1px solid var(--how-deep);
  background: var(--how-deep);
  color: white;
  box-shadow: 18px 18px 0 rgba(208, 122, 58, .17);
}
.signal-panel::after {
  content: "";
  position: absolute;
  inset: 2.8rem 1.3rem 1.3rem;
  border: 1px solid rgba(255,255,255,.16);
  pointer-events: none;
}
.signal-panel-top { position: relative; z-index: 1; display: flex; justify-content: space-between; gap: 1rem; color: #a9c1d6; font: .64rem var(--utility); letter-spacing: .1em; }
.signal-line { position: absolute; z-index: 0; left: 18%; right: 18%; top: 49%; border-top: 1px dashed rgba(255,255,255,.45); }
.signal-line::after { content: ""; position: absolute; right: -1px; top: -4px; width: 7px; height: 7px; border-top: 1px solid white; border-right: 1px solid white; transform: rotate(45deg); }
.signal-node { position: absolute; z-index: 1; display: grid; gap: .2rem; width: 38%; padding: .85rem; border: 1px solid rgba(255,255,255,.45); background: rgba(21,44,65,.94); }
.signal-node::before { content: ""; position: absolute; top: 50%; width: 13px; border-top: 2px solid var(--how-amber); }
.signal-node-cloud { left: 7%; top: 37%; }
.signal-node-cloud::before { right: -14px; }
.signal-node-local { left: 31%; top: 58%; transform: translateY(-50%); border-color: var(--how-amber); }
.signal-node-local::before { right: -14px; }
.signal-node-public { right: 7%; top: 37%; }
.signal-node-public::before { left: -14px; }
.node-kicker { color: var(--how-amber); font: .6rem var(--utility); letter-spacing: .08em; }
.signal-node strong { font: 800 1rem var(--display); letter-spacing: -.02em; }
.signal-node small { color: #a9c1d6; font: .65rem var(--utility); }
.signal-camera { position: absolute; z-index: 2; left: 52%; top: 31%; width: 33px; height: 25px; border: 2px solid var(--how-amber); transform: translateX(-50%); }
.signal-camera::before { content: ""; position: absolute; left: 7px; top: -7px; width: 11px; height: 5px; background: var(--how-amber); }
.signal-camera span { position: absolute; left: 50%; top: 50%; width: 8px; height: 8px; border: 1px solid white; border-radius: 50%; transform: translate(-50%, -50%); }
.signal-camera i { position: absolute; right: -9px; top: 5px; width: 7px; height: 12px; border-top: 2px solid var(--how-amber); border-bottom: 2px solid var(--how-amber); }
.signal-camera b { position: absolute; left: 13px; bottom: -11px; width: 2px; height: 10px; background: var(--how-amber); }
.signal-caption { position: absolute; z-index: 1; left: 1.3rem; right: 1.3rem; bottom: 1.2rem; margin: 0; padding-top: .75rem; border-top: 1px solid rgba(255,255,255,.18); color: #c1d0dc; font-size: .76rem; line-height: 1.4; }

.how-section { margin-top: clamp(5rem, 10vw, 9rem); }
.section-intro { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(250px, .9fr); column-gap: clamp(2rem, 8vw, 8rem); align-items: end; }
.section-intro .eyebrow { grid-column: 1 / -1; }
.section-intro h2, .library-heading h2, .guardrail h2 { max-width: 700px; margin: 0; color: var(--how-deep); font: 800 clamp(2.25rem, 4.8vw, 4.5rem)/.9 var(--display); letter-spacing: -.045em; }
.section-intro > p:last-child, .library-heading > p { margin: 0; color: var(--muted); font-size: .95rem; }
.path-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin: 2.4rem 0 0; padding: 0; list-style: none; background: var(--rule); }
.path-list li { min-width: 0; min-height: 245px; padding: 1.35rem; background: var(--paper); }
.path-index { display: block; margin-bottom: 3.5rem; color: var(--how-amber); font: .75rem var(--utility); letter-spacing: .08em; }
.path-list h3 { margin: 0; color: var(--how-deep); font: 800 1.45rem/1 var(--display); }
.path-list p { margin: .7rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.48; }
code { padding: .08rem .25rem; color: var(--how-blue); background: var(--how-fade); font: .88em var(--utility); }

.boundary-grid { display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.boundary-grid .section-intro { display: block; position: sticky; top: 1rem; }
.boundary-grid .section-intro h2 { margin-top: .4rem; }
.boundary-grid .section-intro > p:last-child { margin-top: 1.4rem; }
.boundary-cards { display: grid; gap: 1px; background: var(--rule); }
.boundary-card { min-height: 170px; padding: 1.35rem 1.5rem 1.25rem; background: var(--paper); }
.boundary-card-private { border-left: 5px solid var(--how-blue); }
.boundary-card-public { border-left: 5px solid var(--how-amber); }
.boundary-card-review { border-left: 5px solid var(--healthy); }
.card-label, .diagram-type { color: var(--muted); font: .63rem var(--utility); letter-spacing: .1em; }
.boundary-card h3 { margin: .45rem 0 0; color: var(--how-deep); font: 800 1.6rem/1 var(--display); }
.boundary-card p { max-width: 620px; margin: .65rem 0 0; color: var(--muted); font-size: .84rem; }
.card-tail { display: block; margin-top: 1rem; color: var(--how-blue); font: .64rem var(--utility); letter-spacing: .05em; }

.library-heading { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(230px, .9fr); gap: 2rem; align-items: end; }
.library-heading .eyebrow { grid-column: 1 / -1; margin-bottom: -.6rem; }
.diagram-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; margin-top: 2.4rem; background: var(--rule); }
.diagram-card { position: relative; display: flex; min-height: 245px; flex-direction: column; grid-column: span 2; padding: 1.35rem; color: inherit; background: var(--paper); text-decoration: none; transition: background 180ms ease, transform 180ms ease; }
.diagram-card-wide { grid-column: span 3; }
.diagram-card:hover { background: #eef3f6; transform: translateY(-4px); }
.diagram-card:focus-visible, .return-link:focus-visible, .spec-note a:focus-visible, .footer-link:focus-visible { outline: 3px solid var(--how-amber); outline-offset: 4px; }
.diagram-number { color: var(--how-amber); font: .72rem var(--utility); letter-spacing: .08em; }
.diagram-type { margin-top: .45rem; }
.diagram-card h3 { margin: auto 0 0; color: var(--how-deep); font: 800 1.55rem/1 var(--display); }
.diagram-card p { margin: .7rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.45; }
.diagram-action { display: flex; justify-content: space-between; margin-top: 1.2rem; color: var(--how-blue); font: .7rem var(--utility); letter-spacing: .05em; text-transform: uppercase; }
.diagram-action span { color: var(--how-amber); font-size: 1rem; line-height: .7; }
.spec-note { margin: 1.25rem 0 0; color: var(--muted); font: .7rem/1.5 var(--utility); }
.spec-note a, .return-link, .footer-link { color: var(--how-blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }

.guardrail { display: grid; grid-template-columns: minmax(0, 1fr) minmax(270px, .7fr); gap: 3rem; align-items: end; padding: 2.5rem 0 3rem; border-block: 1px solid var(--rule); }
.guardrail h2 { max-width: 600px; }
.guardrail-copy p { margin: 0; color: var(--muted); font-size: .95rem; }
.return-link { display: inline-flex; gap: .6rem; margin-top: 1.4rem; font: .78rem var(--utility); }
.return-link span { color: var(--how-amber); font-size: 1.1rem; line-height: .7; }
.footer-link { font-size: .82rem; }

@media (max-width: 900px) {
  .how-hero { grid-template-columns: 1fr; min-height: auto; }
  .signal-panel { min-height: 350px; }
  .path-list { grid-template-columns: repeat(2, 1fr); }
  .path-list li { min-height: 215px; }
  .path-index { margin-bottom: 2.3rem; }
  .boundary-grid { grid-template-columns: 1fr; }
  .boundary-grid .section-intro { position: static; }
  .diagram-grid { grid-template-columns: repeat(2, 1fr); }
  .diagram-card, .diagram-card-wide { grid-column: span 1; }
}

@media (max-width: 560px) {
  .how-site-header { align-items: flex-start; }
  .how-site-header .site-nav { flex-wrap: wrap; gap: .65rem; }
  .how-hero h1 { font-size: clamp(3.2rem, 18vw, 5.2rem); }
  .how-lede, .how-facts { margin-left: 1.35rem; }
  .how-facts { gap: .9rem; }
  .how-facts span { min-width: 6rem; }
  .signal-panel { min-height: 410px; padding: 1rem; }
  .signal-panel-top { font-size: .55rem; }
  .signal-line { left: 11%; right: 11%; }
  .signal-node { width: 46%; padding: .65rem; }
  .signal-node-cloud { left: 4%; top: 32%; }
  .signal-node-local { left: 27%; top: 54%; }
  .signal-node-public { right: 4%; top: 32%; }
  .signal-node strong { font-size: .86rem; }
  .signal-node small { font-size: .56rem; }
  .signal-camera { top: 27%; }
  .signal-caption { left: 1rem; right: 1rem; bottom: 1rem; font-size: .7rem; }
  .section-intro, .library-heading, .guardrail { display: block; }
  .section-intro > p:last-child, .library-heading > p, .guardrail-copy { margin-top: 1.15rem; }
  .section-intro h2, .library-heading h2, .guardrail h2 { font-size: 2.8rem; }
  .path-list, .diagram-grid { grid-template-columns: 1fr; }
  .path-list li { min-height: auto; }
  .path-index { margin-bottom: 1.4rem; }
  .diagram-card, .diagram-card-wide { min-height: 205px; }
  .diagram-card h3 { margin-top: 3rem; }
  .guardrail { padding-block: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  .diagram-card { transition: none; }
  .diagram-card:hover { transform: none; }
}