/* Neural Network (2014 archive): an electronics bench, the network on a scope screen. */

html:has(.arc-nn),
body:has(.arc-nn) {
  background: #070c09;
  color: #cfe3d6;
  color-scheme: dark;
}

.arc-nn {
  --arc-nn-bg: #070c09;
  --arc-nn-panel: #0d1612;
  --arc-nn-panel-2: #101c16;
  --arc-nn-line: #1f3329;
  --arc-nn-line-strong: #2e4a3c;
  --arc-nn-text: #cfe3d6;
  --arc-nn-dim: #8ba597;
  --arc-nn-phosphor: #7cf5a6;
  --arc-nn-phosphor-dim: #3f8f60;
  --arc-nn-copper: #c98a55;
  --arc-nn-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --arc-nn-sans: "FF Meta", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;

  position: relative;
  display: block;
  min-height: 100svh;
  overflow-x: clip;
  background: var(--arc-nn-bg);
  color: var(--arc-nn-text);
  font-family: var(--arc-nn-sans);
  font-size: 17px;
  line-height: 1.65;
  font-variant-numeric: lining-nums;
}

.arc-nn::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1100px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240' fill='none' stroke='%23c98a55' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M0 40h60l20 20h60l20-20h80M40 0v40M40 240v-60l20-20v-56M240 150h-50l-20 20h-36M0 150h16M150 0v30l20 20v36M150 240v-26'/%3E%3Cg fill='%23070c09'%3E%3Ccircle cx='60' cy='100' r='4.5'/%3E%3Ccircle cx='130' cy='170' r='4.5'/%3E%3Ccircle cx='170' cy='90' r='4.5'/%3E%3Ccircle cx='20' cy='150' r='4.5'/%3E%3Ccircle cx='150' cy='210' r='4.5'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 240px 240px;
  opacity: 0.09;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.5) 45%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.5) 45%, transparent 100%);
  pointer-events: none;
}

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

.arc-nn a {
  color: var(--arc-nn-phosphor);
  text-decoration: underline;
  text-decoration-color: rgba(124, 245, 166, 0.4);
  text-underline-offset: 3px;
}

.arc-nn a:hover {
  text-decoration-color: currentColor;
}

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

.arc-nn-wrap {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 32px 48px;
}

/* Top line */

.arc-nn-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--arc-nn-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.arc-nn .arc-nn-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--arc-nn-text);
  text-decoration: none;
}

.arc-nn .arc-nn-home:hover {
  color: var(--arc-nn-phosphor);
}

.arc-nn-archive {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--arc-nn-dim);
}

.arc-nn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--arc-nn-copper);
  box-shadow: 0 0 0 3px rgba(201, 138, 85, 0.18);
}

/* Header */

.arc-nn-header {
  padding: 40px 0 30px;
}

.arc-nn-model {
  margin: 0 0 10px;
  font-family: var(--arc-nn-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--arc-nn-copper);
}

.arc-nn-model span {
  margin: 0 6px;
  color: var(--arc-nn-line-strong);
}

.arc-nn h1 {
  margin: 0;
  font-family: var(--arc-nn-sans);
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #eef7f1;
}

.arc-nn-dek {
  max-width: 36em;
  margin: 14px 0 0;
  font-size: 19px;
  line-height: 1.5;
  color: var(--arc-nn-dim);
}

/* The instrument. Its inner width is the canvas width (the controller reads it),
   so it has a border but no padding. */

.arc-nn-instrument {
  border: 1px solid var(--arc-nn-line-strong);
  border-radius: 10px;
  background: var(--arc-nn-panel);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.arc-nn-screen {
  position: relative;
  background: #040806;
  border-bottom: 1px solid var(--arc-nn-line-strong);
}

.arc-nn-canvas {
  display: block;
  width: 100%;
  height: auto;
  background-color: #040806;
  background-image:
    radial-gradient(ellipse at center, rgba(124, 245, 166, 0.07), transparent 70%),
    linear-gradient(rgba(124, 245, 166, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 245, 166, 0.07) 1px, transparent 1px);
  background-size: 100% 100%, 10% 12.5%, 10% 12.5%;
  background-position: center, -1px -1px, -1px -1px;
}

.arc-nn-layer-labels {
  position: absolute;
  inset: 12px 0 auto 0;
  pointer-events: none;
}

.arc-nn-layer-labels span {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  font-family: var(--arc-nn-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--arc-nn-phosphor-dim);
  white-space: nowrap;
}

.arc-nn-screen-tag {
  position: absolute;
  left: 14px;
  bottom: 10px;
  margin: 0;
  font-family: var(--arc-nn-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--arc-nn-phosphor-dim);
  pointer-events: none;
}

/* Console under the screen */

.arc-nn-console {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr) minmax(0, 1.1fr);
  background: var(--arc-nn-panel);
}

.arc-nn-module {
  padding: 18px 22px 22px;
  border-left: 1px solid var(--arc-nn-line);
}

.arc-nn-module:first-child {
  border-left: 0;
}

.arc-nn .arc-nn-label {
  margin: 0 0 10px;
  font-family: var(--arc-nn-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--arc-nn-dim);
}

.arc-nn .arc-nn-label ~ .arc-nn-label {
  margin-top: 18px;
}

.arc-nn button {
  font: inherit;
  cursor: pointer;
}

.arc-nn .arc-nn-start {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 10px 18px;
  border: 1px solid #5fd98a;
  border-radius: 6px;
  background: linear-gradient(180deg, #8af7b2, #5ad685);
  color: #04200f;
  font-family: var(--arc-nn-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  box-shadow: 0 0 24px -6px rgba(124, 245, 166, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.arc-nn .arc-nn-start:hover {
  background: linear-gradient(180deg, #a2fac3, #6be395);
}

.arc-nn .arc-nn-start:active {
  transform: translateY(1px);
}

.arc-nn-sets {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--arc-nn-line-strong);
  border-radius: 6px;
  overflow: hidden;
}

/* The controller marks the active set with font-bold/text-white and the rest with
   text-[#999]; these selectors restyle that state. */
.arc-nn .arc-nn-set {
  min-height: 44px;
  padding: 8px 4px;
  border: 0;
  border-left: 1px solid var(--arc-nn-line-strong);
  background: var(--arc-nn-panel-2);
  color: var(--arc-nn-dim);
  font-family: var(--arc-nn-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.arc-nn .arc-nn-set:first-child {
  border-left: 0;
}

.arc-nn .arc-nn-set:hover {
  color: var(--arc-nn-text);
  background: #15241c;
}

.arc-nn .arc-nn-set.font-bold {
  background: #133523;
  color: var(--arc-nn-phosphor);
  font-weight: 700;
  box-shadow: inset 0 -2px 0 var(--arc-nn-phosphor);
}

.arc-nn .arc-nn-set:focus-visible {
  outline-offset: -3px;
}

/* Truth table */

.arc-nn-truth table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--arc-nn-mono);
  font-variant-numeric: tabular-nums;
}

.arc-nn-truth th {
  padding: 0 6px 6px;
  border-bottom: 1px solid var(--arc-nn-line-strong);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-align: center;
  text-transform: uppercase;
  color: var(--arc-nn-dim);
}

.arc-nn-truth td {
  padding: 5px 6px;
  border-bottom: 1px solid var(--arc-nn-line);
  font-size: 15px;
  text-align: center;
  color: var(--arc-nn-text);
}

.arc-nn-truth tr:last-child td {
  border-bottom: 0;
}

.arc-nn-truth .arc-nn-pred {
  color: var(--arc-nn-phosphor);
  text-shadow: 0 0 8px rgba(124, 245, 166, 0.45);
}

/* Error readouts */

.arc-nn-readouts {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px;
}

.arc-nn-readout {
  margin: 0;
  padding: 7px 10px 6px;
  border: 1px solid var(--arc-nn-line-strong);
  border-radius: 4px;
  background: #050a07;
  font-family: var(--arc-nn-mono);
  line-height: 1.25;
  min-width: 0;
}

.arc-nn-readout-key {
  display: block;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--arc-nn-dim);
}

.arc-nn-readout-value {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--arc-nn-phosphor);
  text-shadow: 0 0 10px rgba(124, 245, 166, 0.5);
  white-space: nowrap;
}

.arc-nn-trace {
  margin-top: 10px;
  border: 1px solid var(--arc-nn-line-strong);
  border-radius: 4px;
  background: #050a07;
  overflow: hidden;
}

.arc-nn-trace canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 50px;
}

/* Operator's notes */

.arc-nn-notes {
  max-width: 700px;
  margin: 64px auto 0;
}

.arc-nn-lede {
  margin: 0 0 40px;
  padding-left: 18px;
  border-left: 2px solid var(--arc-nn-copper);
  font-size: 21px;
  line-height: 1.5;
  color: #e4efe8;
}

.arc-nn-notes section + section {
  margin-top: 40px;
}

.arc-nn .arc-nn-notes h2 {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 12px;
  font-family: var(--arc-nn-sans);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.3;
  color: #eef7f1;
}

.arc-nn-notes h2 span {
  font-family: var(--arc-nn-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--arc-nn-copper);
}

.arc-nn-notes p {
  margin: 0 0 1em;
}

.arc-nn-notes strong {
  font-weight: 600;
  color: #eef7f1;
}

.arc-nn-steps {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
  counter-reset: arc-nn-step;
}

.arc-nn-steps li {
  position: relative;
  margin: 0 0 8px;
  padding-left: 42px;
  counter-increment: arc-nn-step;
}

.arc-nn-steps li::before {
  content: counter(arc-nn-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.2em;
  font-family: var(--arc-nn-mono);
  font-size: 13px;
  color: var(--arc-nn-phosphor-dim);
}

.arc-nn-ops {
  margin: 0 0 1.2em;
  border: 1px solid var(--arc-nn-line);
  border-radius: 6px;
  background: var(--arc-nn-panel);
}

.arc-nn-ops div {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 16px;
  border-top: 1px solid var(--arc-nn-line);
}

.arc-nn-ops div:first-child {
  border-top: 0;
}

.arc-nn-ops dt {
  font-family: var(--arc-nn-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--arc-nn-phosphor);
}

.arc-nn-ops dd {
  margin: 0;
}

/* Footer */

.arc-nn-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 24px;
  max-width: 700px;
  margin: 56px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--arc-nn-line-strong);
  font-family: var(--arc-nn-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--arc-nn-dim);
}

.arc-nn-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

.arc-nn .arc-nn-footer-home {
  margin-left: auto;
  color: var(--arc-nn-text);
}

/* Narrow screens */

@media (max-width: 900px) {
  .arc-nn-console {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .arc-nn-controls {
    grid-column: 1 / -1;
    border-bottom: 1px solid var(--arc-nn-line);
  }

  .arc-nn-truth {
    border-left: 0;
  }
}

@media (max-width: 640px) {
  .arc-nn {
    font-size: 16px;
  }

  .arc-nn-wrap {
    padding: 8px 16px 36px;
  }

  .arc-nn-header {
    padding: 22px 0 22px;
  }

  .arc-nn-dek {
    font-size: 17px;
  }

  .arc-nn-console {
    grid-template-columns: minmax(0, 1fr);
  }

  .arc-nn-module {
    padding: 16px 16px 18px;
    border-left: 0;
    border-top: 1px solid var(--arc-nn-line);
  }

  .arc-nn-module:first-child {
    border-top: 0;
  }

  .arc-nn-controls {
    border-bottom: 0;
  }

  .arc-nn-layer-labels span {
    font-size: 10px;
    letter-spacing: 0.04em;
  }

  .arc-nn-notes {
    margin-top: 48px;
  }

  .arc-nn-lede {
    font-size: 18px;
  }

  .arc-nn .arc-nn-notes h2 {
    font-size: 21px;
  }

  .arc-nn-ops div {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 10px 12px;
  }

  .arc-nn .arc-nn-footer-home {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arc-nn .arc-nn-start:active {
    transform: none;
  }
}