/* Shared by every page: colour and type tokens, base elements, the neuron
   canvas, the theme switch, icon links and the colophon. Light is a white
   glass brain; dark is a black-background one. */

:root {
  --ground: #fbfcfd;
  --ink: #17202b;
  --ink-soft: #4a5563;
  --rule: rgba(23, 32, 43, 0.14);
  --rule-strong: rgba(23, 32, 43, 0.32);
  --glass: rgba(251, 252, 253, 0.56);
  --glass-solid: rgba(251, 252, 253, 0.9);
  --link: #9d2a6c;
  --focus: #d5446d;
  --net-axon: rgba(74, 85, 99, 0.17);
  --net-soma: rgba(74, 85, 99, 0.38);
  /* Neuron colormap (matplotlib's magma), low to high activation;
     neural-field.js reads these and the colorbar draws them. Ordered so higher
     activation contrasts more with the ground: magma reversed on white, magma
     on black. Links take a colour from the same map. */
  --cmap-0: #fcd5c0;
  --cmap-1: #f7856b;
  --cmap-2: #d5446d;
  --cmap-3: #8c2981;
  --cmap-4: #3b0f70;
  --colorbar: linear-gradient(90deg, var(--cmap-0), var(--cmap-1), var(--cmap-2), var(--cmap-3), var(--cmap-4));

  /* Mona Sans (GitHub's open-source typeface, with a width axis) for the name
     and interface; Source Serif 4 for reading. */
  --font-ui: "Mona Sans", system-ui, sans-serif;
  --font-text: "Source Serif 4", Georgia, serif;
  --measure: 66ch;
  --gutter: clamp(16px, 4vw, 48px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #000;
    --ink: #e9edf2;
    --ink-soft: #a3adb9;
    --rule: rgba(233, 237, 242, 0.14);
    --rule-strong: rgba(233, 237, 242, 0.34);
    --glass: rgba(14, 17, 22, 0.5);
    --glass-solid: rgba(8, 10, 13, 0.88);
    --link: #f590ab;
    --focus: #fe9f6d;
    --net-axon: rgba(200, 210, 222, 0.13);
    --net-soma: rgba(200, 210, 222, 0.3);
    --cmap-0: #3b0f70;
    --cmap-1: #8c2981;
    --cmap-2: #de4968;
    --cmap-3: #fe9f6d;
    --cmap-4: #fde4cf;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ground: #000;
  --ink: #e9edf2;
  --ink-soft: #a3adb9;
  --rule: rgba(233, 237, 242, 0.14);
  --rule-strong: rgba(233, 237, 242, 0.34);
  --glass: rgba(14, 17, 22, 0.5);
  --glass-solid: rgba(8, 10, 13, 0.88);
  --link: #f590ab;
  --focus: #fe9f6d;
  --net-axon: rgba(200, 210, 222, 0.13);
  --net-soma: rgba(200, 210, 222, 0.3);
  --cmap-0: #3b0f70;
  --cmap-1: #8c2981;
  --cmap-2: #de4968;
  --cmap-3: #fe9f6d;
  --cmap-4: #fde4cf;
  color-scheme: dark;
}

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* The network sits fixed behind everything, sized to the large viewport so
   mobile address-bar changes do not stretch it. */
.field {
  position: fixed;
  inset: 0 auto auto 0;
  width: 100vw;
  height: 100vh;
  height: 100lvh;
  z-index: -1;
  pointer-events: none;
}

.theme-switch {
  padding: 6px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--glass-solid);
  color: var(--ink-soft);
  font: 500 0.8125rem/1.2 var(--font-ui);
  cursor: pointer;
}

.theme-switch:hover {
  color: var(--ink);
  border-color: var(--rule-strong);
}

/* Icon-only links: 44px targets, named by aria-label and a hover title. */
.icon-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.icon-links a {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--ink-soft);
  font-size: 1.375rem;
  text-decoration: none;
  transition: color 160ms ease;
}

.icon-links a:hover {
  color: var(--link);
}

.colophon {
  width: min(100%, 1080px);
  margin: 0 auto;
  padding: 32px var(--gutter) 40px;
  color: var(--ink-soft);
  font: 400 0.8125rem/1.5 var(--font-ui);
}

.colophon p {
  margin: 0;
}

.colophon a {
  color: inherit;
}