/* ==========================================================================
   Technology page — architecture diagram + invariant rules
   ========================================================================== */

/* ── Architecture diagram ───────────────────────────────────────────────── */
.arch {
  display: grid;
  grid-template-columns: 1fr auto 1.05fr auto 0.85fr;
  gap: 0;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--console-a), var(--console-b));
  padding: 26px 22px;
  margin-top: 8px;
}
.arch-col { display: grid; gap: 12px; }

.arch-node {
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 16px 15px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.arch-node strong { font-size: 0.98rem; font-weight: 550; letter-spacing: -0.02em; }
.arch-k {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.arch-m { font-size: 0.74rem; color: var(--ink-3); line-height: 1.55; }
.arch-node--edge { border-top: 2px solid var(--brand); }
.arch-node--db   { border-top: 2px solid var(--money); }

.arch-mid {
  display: grid;
  gap: 22px;
  padding-inline: 14px;
  min-width: 128px;
  color: var(--ink-4);
}
.arch-mid--thin { min-width: 62px; padding-inline: 8px; }
.arch-arrow { display: grid; gap: 3px; justify-items: center; }
.arch-arrow svg { width: 100%; height: 12px; color: var(--line-3); }
.arch-lbl {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  white-space: nowrap;
}
.arch-sub {
  font-family: var(--mono);
  font-size: 8px;
  color: var(--ink-4);
  text-align: center;
  line-height: 1.4;
}

/* ── Invariant rules ────────────────────────────────────────────────────── */
.rules { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.rule {
  background: var(--surface);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  padding: 24px 22px;
  transition: background 0.2s var(--ease);
}
.rule:hover { background: var(--surface-2); }
.rule-n {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-4);
  padding-top: 3px;
}
.rule h4 { font-size: 1.02rem; letter-spacing: -0.02em; margin-bottom: 8px; }
.rule p { font-size: 0.88rem; color: var(--ink-2); line-height: 1.68; max-width: 82ch; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 1040px) {
  .arch {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .arch-mid { min-width: 0; padding: 0; justify-items: center; }
  /* Flow reads top-to-bottom on narrow screens, so rotate the connectors. */
  .arch-arrow svg { height: 26px; width: 60px; transform: rotate(90deg); }
  .arch-mid--thin .arch-arrow svg { height: 20px; }
}
@media (max-width: 620px) {
  .rule { grid-template-columns: 1fr; gap: 8px; }
}