:root {
  --bg: #f3f5fa;
  --surface: #ffffff;
  --surface-2: #f8fafd;
  --line: #e2e8f2;
  --line-strong: #cbd6e4;
  --ink: #131c2e;
  --muted: #64748b;
  --accent: #3556e0;
  --accent-soft: #eaefff;
  --accent-ink: #1e3fbf;
  --dark: #101828;
  --good: #0e9f6e;
  --good-soft: #e2f7ef;
  --warn: #d97706;
  --warn-soft: #fdf1dd;
  --bad: #dc2626;
  --bad-soft: #fdeaea;
  --violet: #7c3aed;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.07), 0 2px 6px rgba(16, 24, 40, 0.04);
  --radius: 16px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(53, 86, 224, 0.08), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(14, 159, 110, 0.06), transparent 60%),
    var(--bg);
}

.app {
  max-width: 1480px;
  margin: 0 auto;
  padding: 22px 24px 40px;
}

.topbar,
.action-shell,
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- header ---------- */

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  padding: 20px 24px;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex: none;
  margin-top: 4px;
}

.brand-mark line { stroke: var(--line-strong); stroke-width: 2; }
.brand-mark .mark-a { fill: var(--accent); }
.brand-mark .mark-b { fill: var(--dark); }
.brand-mark .mark-c { fill: var(--good); }

.kicker {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--accent-ink);
  margin-bottom: 4px;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 640px;
}

.badges {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex: none;
}

.mode-badge,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}

.mode-badge {
  background: var(--dark);
  color: #e7edf7;
}

.chip {
  background: #edf1f7;
  color: #475569;
}

.chip.subtle {
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-weight: 600;
}

.chip.tone-ready { background: var(--accent-soft); color: var(--accent-ink); }
.chip.tone-good { background: var(--good-soft); color: #0b7a55; }
.chip.tone-warn { background: var(--warn-soft); color: #a35a05; }
.chip.tone-bad { background: var(--bad-soft); color: #b91c1c; }
.chip.tone-working { background: var(--accent-soft); color: var(--accent-ink); }

.chip.tone-working::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* ---------- action shell ---------- */

.action-shell {
  margin-top: 16px;
  padding: 16px 18px;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 24px;
}

.group-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 10px;
}

.action-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.sim-row {
  display: grid;
  grid-template-columns: minmax(110px, 0.8fr) 1.3fr 0.7fr;
  gap: 8px;
  align-items: stretch;
}

button,
input,
textarea {
  font: inherit;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 10px;
  font-weight: 650;
  font-size: 0.88rem;
  cursor: pointer;
  background: var(--surface-2);
  border-color: var(--line);
  color: var(--ink);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease, box-shadow 0.15s ease;
}

button:hover {
  background: var(--accent-soft);
  border-color: #c3d0f7;
}

button:active { transform: translateY(1px); }

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:disabled {
  opacity: 0.55;
  cursor: default;
  transform: none;
}

button .step {
  flex: none;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border-radius: 6px;
  background: #e5eaf3;
  color: #55627a;
}

button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 6px 16px rgba(53, 86, 224, 0.28);
}

button.active .step {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

button.secondary {
  background: var(--dark);
  border-color: var(--dark);
  color: #fff;
}

button.secondary:hover { background: #1c2a44; }

button.ghost {
  background: transparent;
  color: var(--muted);
}

button.ghost:hover {
  color: var(--bad);
  background: var(--bad-soft);
  border-color: #f3c9c9;
}

.dose-field {
  position: relative;
  display: flex;
}

.dose-field .unit {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  pointer-events: none;
}

input {
  width: 100%;
  padding: 10px 34px 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

/* ---------- layout + cards ---------- */

.layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
  margin-top: 16px;
}

.card { padding: 18px; }

.answer-card,
.protocol-card { min-height: 330px; }

.graph-card,
.ledger-card { grid-column: span 2; }

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.card-head h2 {
  margin: 0;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.answer-summary,
.protocol-preview,
.change-summary,
.impact-panel,
.governance-panel,
.graph-delta,
.system-events,
.citation-tray,
.validation-banner {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  font-size: 0.92rem;
}

.answer-summary,
.protocol-preview,
.change-summary,
.impact-panel,
.governance-panel,
.graph-delta,
.system-events {
  padding: 13px 14px;
}

.placeholder { color: var(--muted); }

.answer-summary { min-height: 84px; }

.draft-box {
  width: 100%;
  min-height: 140px;
  margin-top: 12px;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  resize: vertical;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.6;
}

.draft-box:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.validation-banner {
  margin-top: 12px;
  padding: 12px 14px;
  display: grid;
  gap: 8px;
  background: var(--warn-soft);
  border-color: #f2ddba;
}

.validation-banner.hidden { display: none; }

.validation-issue {
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.severity-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transform: translateY(-1px);
}

.severity-dot.bad { background: var(--bad); }
.severity-dot.warn { background: var(--warn); }

.citation-tray {
  margin-top: 12px;
  min-height: 68px;
  padding: 12px;
  display: grid;
  gap: 8px;
}

.citation-tray.empty {
  color: var(--muted);
  align-content: center;
  justify-content: center;
}

.protocol-preview {
  min-height: 150px;
  white-space: pre-wrap;
  line-height: 1.55;
}

.change-summary,
.impact-panel,
.governance-panel,
.graph-delta {
  margin-top: 12px;
}

.panel-heading {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--muted);
}

/* ---------- graph ---------- */

.graph-canvas {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    linear-gradient(180deg, #fcfdff, #f6f9fd);
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-swatch {
  width: 14px;
  height: 10px;
  border-radius: 3px;
  border: 1px solid var(--line-strong);
}

.legend-line {
  width: 18px;
  height: 0;
  border-top: 2.5px solid;
}

.legend-line.dashed { border-top-style: dashed; }

.graph-node rect {
  stroke: #d3dce8;
  stroke-width: 1.2;
  filter: drop-shadow(0 1px 3px rgba(16, 24, 40, 0.08));
}

.graph-node .node-type {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  fill: #7c8aa0;
  font-family: ui-sans-serif, sans-serif;
}

.graph-node .node-label {
  font-size: 11.5px;
  font-weight: 600;
  fill: #1f2937;
  font-family: ui-sans-serif, sans-serif;
}

.lane-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: #9aa7ba;
  font-family: ui-sans-serif, sans-serif;
}

.node-claim rect { fill: #eef3ff; }
.node-doc rect { fill: #e9f8f1; }
.node-entity rect { fill: #fff6e4; }
.node-container rect { fill: #f3effd; }

.node-new rect { stroke: var(--accent); stroke-width: 2.4; }
.node-superseded rect { stroke: var(--warn); stroke-width: 2; stroke-dasharray: 5 4; }
.node-superseded text { opacity: 0.7; }
.node-impact rect { stroke: var(--good); stroke-width: 2; }

/* ---------- ledger ---------- */

.ledger-columns {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
}

.ledger-columns h3,
.events-head {
  margin: 4px 0 8px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--muted);
}

.events-head { margin-top: 16px; }

.ledger-list,
.document-list {
  display: grid;
  gap: 8px;
  max-height: 280px;
  overflow: auto;
  padding-right: 4px;
}

.ledger-list::-webkit-scrollbar,
.document-list::-webkit-scrollbar { width: 8px; }

.ledger-list::-webkit-scrollbar-thumb,
.document-list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}

.ledger-item,
.document-item,
.citation-item,
.event-item {
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
}

.ledger-item.item-superseded { opacity: 0.72; }

.claim-meta,
.document-meta,
.event-meta,
.mini-meta {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 4px;
}

.claim-status {
  display: inline-flex;
  margin-top: 8px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-active { background: var(--good-soft); color: #0b7a55; }
.status-superseded { background: var(--warn-soft); color: #92400e; }

.system-events {
  min-height: 64px;
  display: grid;
  gap: 8px;
}

.good { color: var(--good); }
.warn { color: var(--warn); }
.bad { color: var(--bad); }

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- responsive ---------- */

@media (max-width: 1240px) {
  .action-shell { grid-template-columns: 1fr; gap: 16px; }
  .action-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .graph-card,
  .ledger-card { grid-column: span 1; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .badges { flex-direction: row; align-items: center; }
}

@media (max-width: 720px) {
  .action-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sim-row { grid-template-columns: 1fr; }
  .ledger-columns { grid-template-columns: 1fr; }
}