:root {
  color-scheme: light;
  --paper: #dbe1e9;
  --ink: #172033;
  --muted: #778091;
  --line: #7c8ba5;
  --cobalt: #4969ee;
  --coral: #f15f57;
  --cyan: #2ea9a5;
}

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

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--paper);
}

body {
  min-height: 100svh;
  color: var(--ink);
  font-family: "Manrope", sans-serif;
  overflow: hidden;
}

.scene {
  position: relative;
  min-height: 100svh;
  padding: clamp(22px, 4vw, 52px);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.28), transparent 42%),
    var(--paper);
  isolation: isolate;
  overflow: hidden;
}

header {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 700;
  letter-spacing: -0.06em;
}

.mono {
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.08em;
}

header .mono,
.legend {
  color: var(--muted);
}

.copy {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: clamp(22px, 5vw, 72px);
  max-width: min(480px, 42vw);
  transform: translateY(-50%);
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--cobalt);
}

h1 {
  margin: 0 0 22px;
  font-size: clamp(46px, 6.8vw, 92px);
  line-height: 0.9;
  letter-spacing: -0.075em;
}

.copy > p:last-child {
  max-width: 390px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(13px, 1.4vw, 17px);
}

.diagram-wrap {
  position: absolute;
  z-index: 2;
  top: 6%;
  right: -2%;
  width: min(74vw, 1050px);
  height: 88%;
}

#diagram {
  width: 100%;
  height: 100%;
  overflow: visible;
  color: var(--line);
}

.rings {
  stroke: var(--line);
  stroke-width: 0.8;
  opacity: 0.24;
  stroke-dasharray: 2 8;
}

.routes {
  stroke: var(--cobalt);
  stroke-width: 1.35;
  opacity: 0.42;
  vector-effect: non-scaling-stroke;
}

.signals {
  fill: var(--coral);
}

.node {
  cursor: crosshair;
  outline: none;
  transition: opacity 180ms ease;
}

.node .halo,
.node .halo-box {
  fill: none;
  stroke: var(--cobalt);
  stroke-width: 1;
  opacity: 0.3;
  stroke-dasharray: 2 5;
}

.node .body,
.node .body-box {
  fill: var(--cobalt);
  opacity: 0.78;
}

.node .core {
  fill: white;
}

.node.process .halo {
  stroke: var(--coral);
}

.node.process .body {
  fill: var(--coral);
}

.node.output .halo-box {
  stroke: var(--cyan);
  stroke-dasharray: none;
}

.node.output .body-box {
  fill: var(--cyan);
}

.node .label,
.node .code,
.measurements {
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 1.2px;
}

.node .label {
  fill: var(--ink);
  font-size: 11px;
  font-weight: 500;
}

.node .code {
  fill: var(--muted);
  font-size: 8px;
}

.measurements {
  fill: var(--muted);
  font-size: 8px;
}

.node.is-active .halo,
.node:focus-visible .halo,
.node.is-active .halo-box,
.node:focus-visible .halo-box {
  opacity: 1;
  stroke-width: 2;
}

.node.is-active .body,
.node:focus-visible .body,
.node.is-active .body-box,
.node:focus-visible .body-box {
  opacity: 1;
  filter: url(#glow);
}

.legend {
  position: absolute;
  z-index: 4;
  right: clamp(22px, 4vw, 52px);
  bottom: clamp(22px, 4vw, 48px);
  display: flex;
  gap: 18px;
}

.legend span {
  display: flex;
  align-items: center;
}

.legend i {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
}

.source-key { border-radius: 50%; background: var(--cobalt); }
.process-key { border-radius: 50%; background: var(--coral); }
.output-key { background: var(--cyan); }

@media (max-width: 700px) {
  header .mono,
  .legend {
    display: none;
  }

  .copy {
    top: 18%;
    max-width: calc(100vw - 44px);
    transform: none;
  }

  h1 {
    font-size: clamp(48px, 15vw, 72px);
  }

  .diagram-wrap {
    top: 40%;
    right: -34%;
    width: 145vw;
    height: 61%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .signals { opacity: 0.7; }
}