/* SPDX-License-Identifier: AGPL-3.0-or-later
 * Copyright (c) 2026 Adrien Conrath
 *
 * The collector and the substrate it feeds — the opening pair of both the
 * landing page's pipeline and the Brain page's architecture diagram. The
 * markup is generated into each page by scripts/render-arch-substrate.mjs;
 * this file is the styling half of that shared pair.
 *
 * Everything here reads design tokens (--surface-raised, --border, --text-*)
 * that each host page defines, so the pair themes with whatever page it is
 * dropped into. Deliberately absent: how the pair collapses on a narrow
 * screen. That is a decision of the surrounding diagram — the landing page
 * has a nine-column pipeline to stack, the Brain page a four-column one —
 * so each page owns its own breakpoint.
 */

/* Tokens the shared markup itself reads. They live here, not on the host
   pages, because a page that links this stylesheet and forgets one loses part
   of the drawing with no error anywhere: --graph-edge alone carries the
   person-to-document edges and both person glyphs in the substrate graph. */
:root {
  --graph-edge: #aeb6c2;
  --graph-shadow: #000000;
}

:root[data-theme="light"] {
  --graph-edge: #6b7785;
  --graph-shadow: #c5cdd6;
}

/* Uniform stage label sitting above every column */
.arch-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

/* A host diagram that needs to drop a connector onto the cards' axis clears
   the label block above them: the 11px label line plus the 10px .arch-col gap,
   a shade under 29px. */
.arch-label {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}

.arch-card {
  background: var(--surface-raised);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  /* Frosted over the page's fixed grid backdrop, so the lines showing
     through read as glass rather than as sharp rules. */
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* Muted caption at the bottom of a box */
.arch-caption {
  color: var(--text-muted);
  font-size: 11px;
  line-height: 1.35;
  text-align: center;
  margin-top: 14px;
}

.arch-collector {
  width: 176px;
}

.src-grid {
  display: grid;
  grid-template-columns: repeat(6, 20px);
  gap: 5px 4px;
  justify-content: center;
  margin-top: 4px;
}

.src-grid img {
  width: 20px;
  height: 20px;
  display: block;
}

.src-dots {
  display: flex;
  justify-content: center;
  gap: 5px;
  margin-top: 14px;
}

.src-dots span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
}

/* The substrate box — the graph, the moat. Largest box, accent fill + glow
   so it reads as the differentiator rather than as one more stage. */
.arch-gateway {
  width: 240px;
  border-color: rgba(88, 166, 255, 0.55);
  background: linear-gradient(160deg, rgba(88, 166, 255, 0.12), rgba(136, 73, 255, 0.05));
  box-shadow:
    0 0 0 1px rgba(88, 166, 255, 0.12),
    0 16px 44px -14px rgba(88, 166, 255, 0.4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.gw-graph {
  margin: 14px 0 6px;
}

.gw-graph svg {
  width: 90%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* Connector between stages. Where it sits on the cross axis is the host
   diagram's business; each page sets align-self / margin to taste. */
.arch-arrow {
  flex-shrink: 0;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-arrow svg {
  width: 30px;
  height: 18px;
  fill: currentColor;
}