:root {
  color-scheme: dark;
  --bg: #0c1220;
  --surface: #141c2e;
  --border: #2a3650;
  --text: #e8edf5;
  --muted: #8b9ab5;
  --accent: #5b9cf5;
  --accent-dim: #3d6fad;
  --ok: #3ecf8e;
  --warn: #f0b429;
  --error: #f07178;
  --step-bg: #111827;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --font-sans: system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header, main, footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.tagline {
  margin: 0.25rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.tagline a, .flow-intro a {
  color: var(--accent);
}

.tagline a:hover, .flow-intro a:hover {
  text-decoration: underline;
}

#status {
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  background: #1a2540;
  border: 1px solid var(--border);
}

#status[data-kind="ok"] { border-color: var(--ok); color: #b8f0d4; }
#status[data-kind="warn"] { border-color: var(--warn); color: #ffe6a8; }
#status[data-kind="error"] { border-color: var(--error); color: #ffc8cb; }
#status[data-busy="true"] { border-color: var(--accent); }

.busy-indicator {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  background: #152238;
  border: 1px solid var(--accent);
  color: #c8dcff;
}

.busy-indicator[hidden] { display: none !important; }

.busy-spinner {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: busy-spin 0.75s linear infinite;
}

@keyframes busy-spin { to { transform: rotate(360deg); } }

.busy-elapsed {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
}

body.is-busy .flow-btn,
body.is-busy button:not(.setup-panel button) {
  pointer-events: none;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.btn, button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
}

.btn.small, button.small { padding: 0.25rem 0.55rem; font-size: 0.8rem; }

button.primary, .btn.primary, .flow-btn.primary {
  background: var(--accent);
  border-color: var(--accent-dim);
  color: #fff;
  font-weight: 600;
}

button.accent, .flow-btn.accent {
  background: #1e4d3a;
  border-color: var(--ok);
  color: #b8f0d4;
  font-weight: 600;
}

button:disabled { opacity: 0.45; cursor: not-allowed; }

select, input[type="number"], input[type="url"], input[type="text"], input[type="password"] {
  font: inherit;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.panel.wide { margin-bottom: 0.75rem; }

.panel header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.panel h2, .panel h3 {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

textarea, #output, .flow-output {
  width: 100%;
  margin: 0;
  padding: 0.75rem;
  border: none;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.45;
  background: #0a0f18;
  color: var(--text);
}

.editor-panel {
  display: flex;
  flex-direction: column;
  min-height: 180px;
}

.editor-panel textarea {
  flex: 1;
  min-height: 160px;
}

footer {
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

footer a { color: var(--accent); }

/* Setup panel (collapsed by default) */
details.setup-panel > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid transparent;
}

details.setup-panel[open] > summary {
  border-bottom-color: var(--border);
}

details.setup-panel > summary::-webkit-details-marker { display: none; }

details.setup-panel > summary h2 {
  display: inline;
  margin: 0;
}

.setup-chevron {
  flex-shrink: 0;
  display: inline-block;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--accent);
  transform: rotate(0deg);
  transition: transform 0.15s ease;
}

details.setup-panel[open] .setup-chevron {
  transform: rotate(90deg);
}

.setup-body {
  padding: 0.75rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.settings-grid label, .stack-label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.settings-actions { margin-top: 0.25rem; }

.inline-status {
  font-size: 0.85rem;
  color: var(--muted);
  margin-left: 0.5rem;
}

.inline-status.ok { color: var(--ok); }
.inline-status.err { color: var(--error); }

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: #1a2540;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* ── Flow graph ── */
.flow {
  margin-top: 0.5rem;
}

.flow-intro {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
  padding: 0.65rem 0.85rem;
  background: #1a2540;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.flow-step {
  background: var(--step-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.flow-step-wide .editors {
  margin-bottom: 0.75rem;
}

.flow-step-head {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: #161f33;
}

.flow-step-head h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
}

.flow-desc {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.flow-badge {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.flow-step-body {
  padding: 0.85rem 1rem 1rem;
}

.flow-arrow {
  text-align: center;
  font-size: 1.25rem;
  color: var(--accent);
  padding: 0.35rem 0;
  line-height: 1;
}

/* Flow connector (2 → 3 grounding status) */
.flow-connector {
  margin: 0.35rem 0 0.15rem;
  border: 1px dashed var(--border);
  border-radius: 10px;
  background: #0d1525;
}

.flow-connector > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.85rem;
  color: var(--muted);
}

.flow-connector > summary::-webkit-details-marker { display: none; }

.flow-connector[data-status="running"] > summary { color: #c8dcff; border-color: var(--accent); }
.flow-connector[data-status="ok"] > summary { color: #b8f0d4; }
.flow-connector[data-status="error"] > summary { color: #ffc8cb; }

.flow-connector-icon {
  flex-shrink: 0;
  width: 1.4rem;
  height: 1.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #1a2540;
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 700;
}

.flow-connector[data-status="ok"] .flow-connector-icon { color: var(--ok); border-color: var(--ok); }
.flow-connector[data-status="error"] .flow-connector-icon { color: var(--error); border-color: var(--error); }
.flow-connector[data-status="running"] .flow-connector-icon { border-color: var(--accent); }

.fci-spin {
  width: 0.95rem;
  height: 0.95rem;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: busy-spin 0.75s linear infinite;
}

.flow-connector-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.flow-connector-log {
  margin: 0;
  padding: 0.75rem 0.85rem 0.85rem;
  border-top: 1px solid var(--border);
  background: #0a0f18;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.flow-select {
  margin-top: 0.5rem;
  width: 100%;
  max-width: 22rem;
}

#assistSource {
  min-height: 90px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.flow-branch {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: start;
}

@media (max-width: 720px) {
  .flow-branch { grid-template-columns: 1fr; }
  .flow-or { text-align: center; }
}

.flow-node {
  background: #0a0f18;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.75rem;
}

.flow-or {
  align-self: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-style: italic;
}

.flow-btn {
  width: 100%;
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.flow-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: #1a2540;
}

.flow-node-hint {
  margin: 0.55rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

.editors {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
}

@media (max-width: 900px) {
  .editors { grid-template-columns: 1fr; }
}

.feedback-label {
  margin-top: 0.5rem;
}

#humanFeedback {
  min-height: 72px;
  border: 1px solid var(--border);
  border-radius: 6px;
  border-left: 3px solid var(--warn);
}

.flow-loop {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding: 0.65rem 0.75rem;
  background: #0d1525;
  border-radius: 8px;
  border: 1px solid #2a3650;
}

.flow-loop-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.flow-loop-row .flow-btn {
  width: auto;
  min-width: 12rem;
}

.flow-loop-arrow {
  font-size: 0.8rem;
  color: var(--muted);
}

.flow-pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.flow-pipeline .flow-btn {
  width: auto;
  min-width: 9rem;
}

.flow-pipe-arrow {
  color: var(--accent);
  font-size: 1.1rem;
}

.flow-advanced {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.flow-advanced summary {
  cursor: pointer;
  margin-bottom: 0.5rem;
}

.flow-advanced textarea {
  min-height: 100px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
}

.flow-output {
  min-height: 100px;
  border: 1px solid var(--border);
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 0.75rem;
}