/* ==========================================================================
   Architecture — the traced walkthrough.
   ========================================================================== */

.arch__problem { font-size: 14.5px; line-height: 1.55; margin-bottom: 7px; max-width: 660px; }
.arch__controls { display: flex; align-items: center; gap: 14px; flex: none; }
.arch__clock {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-ink-300);
  min-width: 96px;
  text-align: right;
  white-space: nowrap;
}
.arch__clock.is-running, .arch__clock.is-done { color: var(--color-purple); }

.arch__facts { margin-bottom: 16px; }
.factcard { display: flex; flex-direction: column; gap: 3px; padding: 13px 16px; }
.factcard__value { font-size: 19px; font-weight: 700; letter-spacing: -0.01em; }
.factcard__label { font-size: 11.5px; color: var(--color-ink-500); line-height: 1.35; }

.arch__layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 20px; align-items: start; }
.arch__canvas { padding: 24px; }
.arch__hint { font-size: 11.5px; color: var(--color-purple); font-weight: 600; line-height: 1.5; margin-bottom: 18px; }
.arch__grid { display: grid; grid-template-columns: 194px 30px minmax(0, 1fr); align-items: start; }
.arch__connector { display: flex; align-items: center; justify-content: center; height: 100%; padding-top: 80px; color: var(--color-ink-100); }
.arch__connector.is-lit { color: var(--color-purple-300); }
.arch__stackhead { display: flex; align-items: baseline; gap: 6px; margin-bottom: 11px; min-width: 0; }
.arch__brand { font-size: 11px; font-weight: 700; letter-spacing: -0.01em; color: var(--color-purple); flex: none; }
.arch__stackhead .card__label { margin-bottom: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.segmented--tenants {
  display: flex;
  gap: 5px;
  padding: 3px;
  background: var(--color-mist-2);
  border: none;
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  width: 100%;
}
.segmented--tenants button {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: center;
  padding: 8px 10px;
  border-radius: 6px;
  background: transparent;
  color: var(--color-ink-500);
  min-width: 0;
}
.segmented--tenants button.is-active {
  background: var(--color-white);
  color: var(--color-ink-900);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}
.segmented__label { font-size: 12.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.segmented__sub { font-size: 10.5px; font-weight: 600; color: var(--color-ink-300); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.segmented--tenants button.is-active .segmented__label { font-weight: 700; }
.segmented--tenants button.is-active .segmented__sub { color: var(--color-purple); }

/* ---- Customer environment --------------------------------------------- */
.envbox {
  border: 1.5px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 13px;
  background: #FBFBFD;
  transition: border-color var(--dur-3), background var(--dur-3);
}
.envbox.is-live { border-style: solid; border-color: var(--color-purple); background: var(--color-purple-surface); }
.envbox__head { display: flex; align-items: baseline; gap: 7px; margin-bottom: 11px; }
.envbox__num { font-size: 10px; font-weight: 700; color: var(--color-ink-300); }
.envbox.is-live .envbox__num { color: var(--color-purple); }
.envbox__head .card__label { margin-bottom: 0; font-size: 10px; }
.envbox__items { display: flex; flex-direction: column; gap: 7px; }
.envbox__item {
  padding: 8px 10px;
  background: var(--color-white);
  border: 1px solid var(--color-border-soft);
  border-radius: 7px;
  font-size: 11px;
  line-height: 1.35;
  transition: border-color var(--dur-3);
}
.envbox__item.is-focus { border-color: var(--color-purple); }
.envbox__item[data-tip] { cursor: help; }
.envbox__item[data-tip] span { border-bottom: 1px dotted var(--color-ink-300); padding-bottom: 1px; }
.envbox__trace {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--color-purple-border);
  font-size: 9.5px;
  line-height: 1.45;
  color: var(--color-purple);
  animation: daFadeIn 220ms ease-out;
}

/* ---- Layers ------------------------------------------------------------ */
.layer {
  position: relative;
  border: 1.5px solid var(--color-border);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color var(--dur-3), background var(--dur-3);
}
.layer:hover { border-color: var(--color-purple-300); }
.layer.is-past { border-color: var(--color-purple-border); }
.layer.is-selected, .layer.is-live { border-color: var(--color-purple); background: var(--color-purple-surface); }
.layer.is-live { animation: daPulse 1.1s ease-out infinite; }
.layer__head { display: flex; align-items: center; gap: 10px; margin-bottom: 7px; }
.layer__num {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--color-mist-2);
  color: var(--color-ink-300);
  font-size: 10px;
  font-weight: 700;
}
.layer.is-past .layer__num { background: #EDE8F8; color: var(--color-purple); }
.layer.is-selected .layer__num, .layer.is-live .layer__num { background: var(--color-purple); color: var(--color-white); }
.layer__icon { display: flex; color: var(--color-ink-700); flex: none; }
.layer.is-selected .layer__icon, .layer.is-live .layer__icon { color: var(--color-purple); }
.layer__spacer { flex: 1; }
.layer__tag {
  flex: none;
  font-size: 9.5px;
  color: var(--color-ink-500);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 2px 9px;
  white-space: nowrap;
}
.layer__name { font-size: 13.5px; font-weight: 700; line-height: 1.3; margin-bottom: 3px; }
.layer__plain { font-size: 12px; color: var(--color-ink-700); line-height: 1.45; margin-bottom: 11px; }
.layer__boxes { display: flex; gap: 8px; flex-wrap: wrap; }
.layer__box {
  flex: 1;
  min-width: 132px;
  background: var(--color-white);
  border: 1px solid var(--color-border-soft);
  border-radius: 7px;
  padding: 9px 11px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.layer.is-selected .layer__box, .layer.is-live .layer__box { border-color: var(--color-purple-border); }
.layer__box[data-tip] { cursor: help; }
.layer__boxtitle { font-size: 11.5px; font-weight: 600; align-self: flex-start; }
.layer__box[data-tip] .layer__boxtitle { border-bottom: 1px dotted var(--color-ink-300); padding-bottom: 1px; }
.layer__boxsub { font-size: 9.5px; color: var(--color-ink-500); }
/* Always in flow, only faded: a looping trace that toggled `display` would
   change the page height on every cycle, and the browser's scroll anchoring
   would then drift the scroll position under the reader. */
.layer__trace {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-top: 11px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-purple-border);
  visibility: hidden;
  opacity: 0;
  transition: opacity 200ms var(--ease-out);
}
.layer.is-traced .layer__trace { visibility: visible; opacity: 1; }
.layer__stamp {
  flex: none;
  font-size: 9.5px;
  font-weight: 700;
  color: var(--color-purple);
  background: var(--color-purple-tint);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  white-space: nowrap;
}
.layer__traceline { font-size: 10px; line-height: 1.5; color: var(--color-ink-700); }

.arch__down { display: flex; justify-content: center; padding: 5px 0; color: var(--color-ink-100); }
.arch__down.is-lit { color: var(--color-purple-300); }

.returnbar {
  grid-column: 1 / -1;
  margin-top: 16px;
  border: 1.5px solid var(--color-border);
  background: #FCFCFD;
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink-100);
  transition: border-color var(--dur-3), background var(--dur-3);
}
.returnbar.is-live { border-color: var(--color-purple); background: var(--color-purple-surface); color: var(--color-purple); }
.returnbar__text { font-size: 12.5px; font-weight: 600; flex: 1; min-width: 0; color: var(--color-ink-300); }
.returnbar.is-live .returnbar__text { color: var(--color-ink-900); }
.returnbar__stamp { font-size: 10px; white-space: nowrap; }

/* ---- Side panels ------------------------------------------------------- */
.arch__side { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 80px; }
.arch__selname { font-size: 15.5px; font-weight: 700; margin-bottom: 8px; }
.arch__seldesc { font-size: 13px; line-height: 1.6; color: var(--color-ink-700); margin-bottom: 14px; }
.arch__sidenote { line-height: 1.5; margin-top: 11px; padding-top: 11px; border-top: 1px solid var(--color-ink-50); }
.arch__sector { font-size: 12px; font-weight: 600; margin-bottom: 6px; }

.beforeafter { display: flex; flex-direction: column; gap: 13px; }
.beforeafter__head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.beforeafter__title { font-size: 11.5px; font-weight: 700; color: var(--color-ink-300); }
.beforeafter__title--accent { color: var(--color-purple); }
.beforeafter__text { font-size: 12.5px; line-height: 1.55; color: var(--color-ink-500); margin-top: 5px; }
.beforeafter__text--strong { color: var(--color-ink-900); }
.beforeafter__rule { height: 1px; background: var(--color-ink-50); }
.beforeafter .mono { font-size: 10.5px; }
.beforeafter .accent { font-weight: 700; }

.isorows { display: flex; flex-direction: column; gap: 9px; }
.isorow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding-bottom: 9px;
  border-bottom: 1px solid #F5F7FA;
  font-size: 12px;
  color: var(--color-ink-700);
}
.isorow__value {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--color-ink-900);
  background: var(--color-mist-2);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  white-space: nowrap;
}

.deployrows { display: flex; flex-direction: column; gap: 8px; }
.deployrow { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.deployrow span:first-child { font-size: 12px; color: var(--color-ink-100); }
.deployrow .mono { font-size: 10.5px; color: var(--color-white); text-align: right; }

@media (max-width: 1180px) {
  .arch__layout { grid-template-columns: 1fr; }
  .arch__side { position: static; }
  .arch__grid { grid-template-columns: 1fr; }
  .arch__connector { display: none; }
  .arch__facts { grid-template-columns: 1fr; }
}