.proposal-nav-item {
  border-top: 1px solid var(--side-line);
  margin-top: 8px;
}

.proposal-nav-item span {
  color: var(--amber);
}

.architecture-page {
  display: grid;
  gap: 32px;
}

.architecture-hero {
  align-items: end;
  display: flex;
  gap: 28px;
  justify-content: space-between;
}

.architecture-hero h2 {
  font-size: clamp(30px, 4.4vw, 50px);
  margin: 6px 0 10px;
  max-width: 900px;
}

.architecture-hero p {
  color: var(--muted);
  margin: 0;
  max-width: 820px;
}

.architecture-fact {
  border-left: 4px solid var(--teal);
  display: grid;
  flex: 0 0 215px;
  padding: 8px 0 8px 16px;
}

.architecture-fact span,
.architecture-fact small {
  color: var(--muted);
  font-size: 12px;
}

.architecture-fact b {
  color: var(--navy-deep);
  font-size: 18px;
}

.plain-answer {
  align-items: center;
  background: var(--navy-deep);
  color: var(--on-ink);
  display: flex;
  font-size: clamp(16px, 2vw, 20px);
  gap: 14px;
  padding: 20px 24px;
}

.plain-answer b {
  color: var(--amber);
  white-space: nowrap;
}

.architecture-section {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: clamp(22px, 3vw, 34px);
}

.architecture-section-title {
  align-items: flex-start;
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
}

.architecture-section-title > span {
  background: var(--navy);
  color: var(--on-ink);
  flex: 0 0 auto;
  font-weight: 700;
  padding: 5px 9px;
}

.architecture-section-title h3 {
  font-size: clamp(22px, 3vw, 30px);
  margin: 0 0 4px;
}

.architecture-section-title p {
  color: var(--muted);
  margin: 0;
}

.architecture-map {
  align-items: stretch;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(210px, .72fr) minmax(0, 1fr);
}

.environment-card,
.delivery-card {
  border: 1px solid var(--line);
  min-width: 0;
  padding: 24px;
  position: relative;
}

.environment-card h4,
.delivery-card h4 {
  color: var(--navy-deep);
  font-size: 22px;
  margin: 18px 0 7px;
}

.environment-card p {
  color: var(--muted);
  margin-bottom: 14px;
}

.environment-card ul,
.delivery-card ol {
  margin: 0;
  padding-left: 20px;
}

.environment-card li,
.delivery-card li {
  margin: 6px 0;
}

.environment-card.is-demo {
  background: var(--info-bg);
  border-top: 5px solid var(--info);
}

.environment-card.is-production {
  background: var(--success-bg);
  border-top: 5px solid var(--teal);
}

.architecture-badge {
  background: var(--surface);
  color: var(--navy);
  font-size: 12px;
  font-weight: 800;
  padding: 4px 8px;
}

.delivery-card {
  align-self: center;
  background: var(--warning-bg);
  border-color: var(--warning-line);
  text-align: center;
}

.delivery-card::before,
.delivery-card::after {
  color: var(--amber);
  content: "→";
  font-size: 30px;
  font-weight: 700;
  position: absolute;
  top: calc(50% - 22px);
}

.delivery-card::before {
  left: -33px;
}

.delivery-card::after {
  right: -33px;
}

.delivery-card > span {
  color: var(--amber-ink);
  font-size: 12px;
  font-weight: 800;
}

.delivery-card ol {
  display: inline-block;
  text-align: left;
}

.boundary-line,
.rehearsal-note {
  background: var(--danger-bg);
  border-left: 5px solid var(--danger);
  display: grid;
  gap: 2px;
  margin-top: 18px;
  padding: 15px 18px;
}

.boundary-line strong {
  color: var(--danger);
}

.data-flow,
.migration-flow {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(5, 1fr);
  list-style: none;
  margin: 0;
  padding: 0;
}

.data-flow li,
.migration-flow li {
  background: #f6f5f1;
  border-top: 4px solid var(--teal);
  display: grid;
  min-height: 122px;
  padding: 18px 15px;
  position: relative;
}

.data-flow li:not(:last-child)::after,
.migration-flow li:not(:last-child)::after {
  color: var(--amber);
  content: "›";
  font-size: 30px;
  font-weight: 700;
  position: absolute;
  right: -10px;
  top: 34px;
  z-index: 1;
}

.data-flow b,
.migration-flow b {
  color: var(--navy-deep);
}

.data-flow span,
.migration-flow small {
  color: var(--muted);
  font-size: 13px;
}

.migration-flow li > span {
  color: var(--teal-dark);
  font-size: 22px;
  font-weight: 700;
}

.security-answer,
.database-choice {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.security-answer > div,
.database-choice > div {
  background: var(--success-bg);
  border-left: 5px solid var(--teal);
  padding: 22px;
}

.security-answer > div + div,
.database-choice > div + div {
  background: var(--warning-bg);
  border-left-color: var(--amber);
}

.security-answer span,
.database-choice span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
}

.security-answer h4,
.database-choice b {
  color: var(--navy-deep);
  display: block;
  font-size: 21px;
  margin: 6px 0 8px;
}

.security-answer p,
.database-choice p {
  margin: 0;
}

.control-grid,
.responsibility-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.control-grid article,
.responsibility-grid article {
  border: 1px solid var(--line);
  display: grid;
  gap: 3px;
  padding: 17px;
}

.control-grid b,
.responsibility-grid b {
  color: var(--navy-deep);
}

.control-grid span,
.responsibility-grid span,
.responsibility-grid p {
  color: var(--muted);
  font-size: 13px;
}

.responsibility-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.responsibility-grid article {
  border-top: 4px solid var(--navy);
}

.responsibility-grid p {
  margin: 4px 0 0;
}

.rehearsal-note {
  background: var(--warning-bg);
  border-left-color: var(--amber);
}

.architecture-decision {
  border-bottom: 6px solid var(--navy);
}

.hr-decisions {
  border-top: 1px solid var(--line);
  margin-top: 24px;
  padding-top: 20px;
}

.hr-decisions h4 {
  color: var(--navy-deep);
  font-size: 18px;
  margin: 0 0 8px;
}

.hr-decisions ul {
  columns: 2;
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 1050px) {
  .architecture-map {
    grid-template-columns: 1fr 1fr;
  }

  .delivery-card {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  .delivery-card::before,
  .delivery-card::after {
    display: none;
  }

  .data-flow,
  .migration-flow {
    grid-template-columns: repeat(3, 1fr);
  }

  .responsibility-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .architecture-hero,
  .plain-answer {
    align-items: flex-start;
    flex-direction: column;
  }

  .architecture-fact {
    flex-basis: auto;
    width: 100%;
  }

  .architecture-map,
  .security-answer,
  .database-choice {
    grid-template-columns: 1fr;
  }

  .delivery-card {
    grid-column: auto;
    grid-row: auto;
  }

  .data-flow,
  .migration-flow,
  .control-grid,
  .responsibility-grid {
    grid-template-columns: 1fr;
  }

  .data-flow li,
  .migration-flow li {
    min-height: auto;
  }

  .data-flow li:not(:last-child)::after,
  .migration-flow li:not(:last-child)::after {
    bottom: -24px;
    content: "↓";
    right: 18px;
    top: auto;
  }

  .hr-decisions ul {
    columns: 1;
  }
}