/* platform.css — request-path diagram, sandbox rows, diagram gallery. */

.arch { list-style: none; margin: var(--space-8) 0 0; padding: 0; display: flex; gap: 0; align-items: stretch; }
.arch__stage {
  position: relative; flex: 1 1 0; min-width: 0;
  padding: var(--space-4) var(--space-4) var(--space-5);
  margin-right: var(--space-6);
  background: var(--surface-3);
  border: 0.5px solid var(--border-card); border-top: 3px solid var(--accent-500);
  border-radius: var(--radius-md);
  opacity: 0; transform: translateY(10px);
  transition: opacity var(--duration-slow) var(--easing-out), transform var(--duration-slow) var(--easing-out);
  transition-delay: calc(var(--i) * 90ms);
}
.arch__stage:last-child { margin-right: 0; }
/* The connector IS the arrow — no glyphs. It draws itself with the stage. */
.arch__stage:not(:last-child)::after {
  content: ""; position: absolute; top: 50%; left: 100%;
  width: var(--space-6); height: 2px; background: var(--accent-300);
  transform: scaleX(0); transform-origin: left center;
  transition: transform var(--duration-slow) var(--easing-out);
  transition-delay: calc((var(--i) + 1) * 90ms);
}
.arch.is-drawn .arch__stage { opacity: 1; transform: none; }
.arch.is-drawn .arch__stage::after { transform: scaleX(1); }
.arch__label { display: block; font-size: var(--size-body); font-weight: 700; line-height: 1.2; }
.arch__note { display: block; font-size: var(--size-caption); color: var(--fg-tertiary); margin-top: var(--space-2); }

@media (prefers-reduced-motion: reduce) {
  .arch__stage { opacity: 1; transform: none; }
  .arch__stage::after { transform: scaleX(1); }
}

@media (max-width: 900px) {
  .arch { flex-direction: column; gap: var(--space-6); }
  .arch__stage { margin-right: 0; }
  .arch__stage:not(:last-child)::after {
    top: 100%; left: 50%; width: 2px; height: var(--space-6);
    transform: scaleY(0); transform-origin: top center;
  }
  .arch.is-drawn .arch__stage::after { transform: scaleY(1); }
}

.envelope { margin-top: var(--space-8); display: grid; grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); gap: var(--space-5); }
.envelope__item { border-left: 3px solid var(--accent-500); padding-left: var(--space-4); }
.envelope__name { font-size: var(--size-body); font-weight: 700; margin: 0; }
.envelope__note { font-size: var(--size-body); color: var(--fg-secondary); margin: var(--space-2) 0 0; }

.diagrams { margin-top: var(--space-8); display: grid; grid-template-columns: repeat(auto-fit, minmax(min(360px, 100%), 1fr)); gap: var(--space-5); }
.diagrams .shot img { aspect-ratio: 1.6; object-fit: contain; background: var(--surface-3); padding: var(--space-3); }

/* ── LLM Proxy hub illustration ── */
.hub {
  position: relative; margin-top: var(--space-8);
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: var(--space-10); align-items: center;
  padding: var(--space-8) var(--space-6);
  border: 0.5px solid var(--border-card); border-radius: var(--radius-xl);
  background-color: var(--surface-2);
}
.hub__edges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.hub__edge {
  fill: none; stroke: var(--accent-300); stroke-width: 1.75;
  stroke-dasharray: 5 7; stroke-linecap: round;
  animation: hub-flow 1.6s linear infinite;
}
@keyframes hub-flow { to { stroke-dashoffset: -24; } }

.hub__col { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-3); }
.hub__colHead {
  font-size: var(--size-micro); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg-tertiary); font-weight: 700; margin-bottom: var(--space-1);
}
.hub__col--aliases .hub__colHead { text-align: right; }

.hub__node {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; gap: 2px;
  padding: var(--space-3) var(--space-4);
  background: var(--surface-3); border: 0.5px solid var(--border-card);
  border-radius: var(--radius-md); box-shadow: var(--shadow-xs);
}
.hub__node--alias { text-align: right; }
.hub__name { font-size: var(--size-body); font-weight: 700; color: var(--fg-primary); line-height: 1.2; }
.hub__note { font-size: var(--size-micro); color: var(--fg-tertiary); }

.hub__col--gateway { align-items: center; }
.hub__gateway {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  padding: var(--space-6) var(--space-6);
  min-width: 210px; text-align: center;
  background: var(--gradient-rail); color: var(--fg-on-dark);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-hi);
  border-top: 3px solid var(--accent-500);
}
.hub__gatewayKicker { font-size: var(--size-micro); letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-on-dark-muted); }
.hub__gatewayName { font-size: var(--size-h2); font-weight: 700; line-height: 1.1; }
.hub__chips { list-style: none; margin: var(--space-2) 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-1); justify-content: center; }
.hub__chip {
  font-size: var(--size-micro); color: var(--fg-on-dark);
  padding: 2px var(--space-2); border-radius: var(--radius-xs);
  background: color-mix(in srgb, var(--fg-on-dark) 14%, transparent);
}
.hub__caption { margin: var(--space-4) 0 0; font-size: var(--size-caption); color: var(--fg-tertiary); max-width: 68ch; }

@media (prefers-reduced-motion: reduce) {
  .hub__edge { animation: none; }
}

@media (max-width: 860px) {
  /* Stacked: the column headings carry the direction, so the beziers are
     dropped rather than drawn sideways across a vertical layout. */
  .hub { grid-template-columns: 1fr; gap: var(--space-6); }
  .hub__col--aliases .hub__colHead, .hub__node--alias { text-align: left; }
  .hub__gateway { width: 100%; }
}