/* Technical architecture doc — interactive layer */

.arch-doc-page .page-hero {
  position: relative;
  overflow: hidden;
}

.arch-read-progress {
  position: fixed;
  top: var(--header-h, 64px);
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  background: transparent;
  pointer-events: none;
}

.arch-read-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--accent));
  transition: width 0.12s ease-out;
}

.arch-metrics {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, 1fr);
  margin-top: -1rem;
  margin-bottom: 0;
  padding-bottom: 2rem;
}

@media (min-width: 720px) {
  .arch-metrics {
    grid-template-columns: repeat(4, 1fr);
  }
}

.arch-metric {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  text-align: center;
}

.arch-metric strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.arch-metric span {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.arch-doc-body {
  padding-top: 0;
}

.arch-doc-body .doc-toc a.is-active {
  color: var(--cyan);
  font-weight: 600;
}

.arch-doc-body .doc-toc a.is-active::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  margin-right: 0.4rem;
  vertical-align: middle;
}

/* Interactive flow diagram */
.arch-interactive {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-grad);
  overflow: hidden;
  margin: 1.5rem 0;
}

.arch-interactive__steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.2);
}

.arch-step {
  flex: 1 1 calc(33% - 0.35rem);
  min-width: 5.5rem;
  padding: 0.65rem 0.5rem;
  border: 1px solid var(--line2);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
  font-family: inherit;
  font-size: 0.75rem;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.arch-step strong {
  display: block;
  font-size: 0.8125rem;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.arch-step:hover {
  border-color: rgba(34, 211, 238, 0.4);
}

.arch-step.is-active {
  border-color: var(--cyan);
  background: var(--cyan-soft);
  color: var(--text);
}

.arch-step.is-active strong {
  color: var(--cyan);
}

.arch-interactive__detail {
  padding: 1.25rem 1.35rem;
  min-height: 7rem;
}

.arch-interactive__detail h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.arch-interactive__detail p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.6;
}

.arch-interactive__detail .arch-tag {
  display: inline-block;
  margin-top: 0.75rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
}

.arch-offline-path {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 1px dashed var(--line2);
  border-radius: 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
}

/* Mode tabs (online / offline) */
.mode-tabs {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0 0;
}

.mode-tab {
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-tab.is-active {
  border-color: var(--cyan);
  background: var(--cyan-soft);
  color: var(--cyan);
}

.mode-panel {
  display: none;
  margin-top: 1rem;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  animation: archFadeIn 0.25s ease;
}

.mode-panel.is-active {
  display: block;
}

@keyframes archFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* API lab */
.api-lab {
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--surface);
}

.api-lab__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
}

.api-lab__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.api-lab__tab {
  padding: 0.35rem 0.75rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
}

.api-lab__tab.is-active {
  border-color: var(--line2);
  background: var(--bg1);
  color: var(--cyan);
}

.api-env-toggle {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 0.68rem;
}

.api-env-toggle button {
  padding: 0.3rem 0.6rem;
  border: none;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
}

.api-env-toggle button.is-active {
  background: var(--cyan-soft);
  color: var(--cyan);
}

.api-lab__panel {
  display: none;
}

.api-lab__panel.is-active {
  display: block;
}

.api-lab__hint {
  padding: 0.85rem 1rem 0;
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.arch-metrics-section {
  padding-top: 0;
  padding-bottom: 1.5rem;
}

.code-panel-wrap {
  position: relative;
}

.code-panel-wrap pre.code-panel {
  margin: 0;
  border: none;
  border-radius: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.code-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
}

.copy-btn {
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--line2);
  border-radius: 6px;
  background: var(--bg1);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.copy-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.copy-btn.is-copied {
  color: var(--green, #34d399);
  border-color: var(--green, #34d399);
}

/* Reconciliation stepper */
.recon-stepper {
  display: grid;
  gap: 0.5rem;
  margin: 1.25rem 0;
}

@media (min-width: 640px) {
  .recon-stepper {
    grid-template-columns: repeat(4, 1fr);
  }
}

.recon-step {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
  text-align: left;
  font: inherit;
  color: inherit;
}

.recon-step:hover {
  border-color: rgba(34, 211, 238, 0.35);
}

.recon-step.is-active {
  border-color: var(--cyan);
  background: var(--cyan-soft);
  transform: translateY(-2px);
}

.recon-step__num {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--cyan);
  margin-bottom: 0.35rem;
}

.recon-step strong {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.recon-step span {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.45;
}

.recon-detail {
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.2);
  margin-bottom: 1rem;
}

.recon-detail p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Assumption accordion */
.assumption-list {
  display: grid;
  gap: 0.5rem;
}

.assumption-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  overflow: hidden;
}

.assumption-item summary {
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.assumption-item summary::-webkit-details-marker {
  display: none;
}

.assumption-item summary::after {
  content: '+';
  font-family: var(--mono);
  color: var(--cyan);
  font-size: 1.1rem;
}

.assumption-item[open] summary::after {
  content: '−';
}

.assumption-item[open] summary {
  border-bottom: 1px solid var(--line);
  border-left: 3px solid var(--accent);
}

.assumption-item p {
  margin: 0;
  padding: 0.85rem 1.1rem 1rem;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.6;
}

.doc-section .section-label {
  display: block;
  margin-bottom: 0.35rem;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.related-links a {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.8125rem;
  text-decoration: none;
  color: var(--muted);
  transition: border-color 0.2s, color 0.2s;
}

.related-links a:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .mode-panel,
  .arch-read-progress__bar,
  .recon-step {
    animation: none;
    transition: none;
  }
}