.projects-head {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: var(--sp-12) var(--sp-8);
}

.projects-head::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(55% 90% at 0% 100%, color-mix(in srgb, var(--c-blue) 22%, transparent), transparent 70%);
}

.projects-head__title {
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.projects-head__lead {
  max-width: 44rem;
  margin: var(--sp-4) 0 0;
  color: var(--c-text-muted);
}

.board {
  --travel: 5s;
  --stub: 22px;
  --elbow: var(--sp-4);
  --node: 12px;
  --pad: 7px;

  display: flex;
  align-items: center;
  gap: var(--sp-4);
  margin-top: var(--sp-8);
}

.board__chip {
  position: relative;
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--c-line-strong);
  border-radius: calc(var(--radius) / 2);
  background-color: var(--c-bg-deep);
  font-family: var(--font-display);
  font-size: var(--fs-tiny);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--c-text-muted);
}

.board__chip b {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
  color: var(--c-accent);
}

.board__chip::before,
.board__chip::after {
  content: "";
  position: absolute;
  left: var(--sp-3);
  right: var(--sp-3);
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--c-line-strong) 0 2px, transparent 2px 9px);
}

.board__chip::before { bottom: 100%; }
.board__chip::after { top: 100%; }

.board__bus {
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: calc(2 * var(--stub) + var(--node) + var(--sp-4));
  overflow: hidden;
  container-type: inline-size;
}

.board__bus::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-50%);
  background-color: var(--c-grid-strong);
}

.board__bus::after {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(var(--node) / -2);
  width: var(--node);
  height: var(--node);
  margin-top: calc(var(--node) / -2);
  border-radius: 50%;
  background-color: var(--c-accent);
  box-shadow: 0 0 12px 3px color-mix(in srgb, var(--c-accent) 55%, transparent);
  animation: mechanica-signal var(--travel) linear infinite;
}

.board__node {
  position: relative;
  flex: none;
  width: var(--node);
  height: var(--node);
  border: 2px solid color-mix(in srgb, var(--c-accent) 40%, transparent);
  border-radius: 50%;
  background-color: var(--c-bg);
  animation: mechanica-node var(--travel) linear infinite;
  animation-delay: calc(var(--at) * var(--travel) * 0.8);
}

.board__node:nth-child(even) { transform: scaleY(-1); }

.board__node::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 100%;
  width: var(--elbow);
  height: var(--stub);
  border-top: 1px solid var(--c-grid-strong);
  border-left: 1px solid var(--c-grid-strong);
}

.board__node::after {
  content: "";
  position: absolute;
  left: calc(50% + var(--elbow) - var(--pad) / 2);
  bottom: calc(100% + var(--stub) - var(--pad) / 2);
  width: var(--pad);
  height: var(--pad);
  border: 1px solid var(--c-grid-strong);
  border-radius: 50%;
  background-color: var(--c-bg);
}

@keyframes mechanica-signal {
  0% { transform: translateX(0); opacity: 0; }
  4%, 76% { opacity: 1; }
  80%, 100% { transform: translateX(100cqi); opacity: 0; }
}

@keyframes mechanica-node {
  0%, 3% {
    border-color: var(--c-accent);
    background-color: var(--c-accent);
    box-shadow: 0 0 12px 2px color-mix(in srgb, var(--c-accent) 55%, transparent);
  }

  22%, 100% {
    border-color: color-mix(in srgb, var(--c-accent) 40%, transparent);
    background-color: var(--c-bg);
    box-shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .board__bus::after { display: none; }

  .board__node {
    animation: none;
    border-color: var(--c-accent);
  }
}

@media (max-width: 560px) {
  .board {
    --stub: 16px;
    --elbow: var(--sp-3);

    gap: var(--sp-3);
  }

  .board__chip { padding: var(--sp-2) var(--sp-3); }
  .board__chip b { font-size: 1.25rem; }
}