/* Arbiter demo UI: restrained neobrutalist fintech styling.
   System font stacks only; the page must not load assets from external hosts. */

:root {
  --bg: #f4f1e8;
  --surface: #fffdf7;
  --ink: #111111;
  --muted: #d9d5ca;
  --muted-ink: #5f5b52;

  --violet: #6c5ce7;
  --green: #b8ff5a;
  --amber: #ffb000;
  --coral: #ff5c5c;
  --cyan: #5bc0eb;

  /* Each tab panel overrides the accent: violet for Decision Engine, green for Customer Agent. */
  --accent: var(--violet);
  --accent-ink: #ffffff;

  --border: 3px solid var(--ink);
  --border-thin: 2px solid var(--ink);
  --radius: 4px;
  --shadow: 6px 6px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);

  --font-sans: "Space Grotesk", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  font-family: var(--font-sans);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

code { font-family: var(--font-mono); font-size: 0.88em; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--surface);
  border-bottom: var(--border);
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand h1 { margin: 0; font-size: 1.45rem; font-weight: 800; letter-spacing: -0.02em; }
.tagline { margin: 0; color: var(--muted-ink); font-family: var(--font-mono); font-size: 0.78rem; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--violet);
  box-shadow: var(--shadow-sm);
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
}

.docs-link {
  padding: 7px 14px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  transition: transform 80ms ease, box-shadow 80ms ease;
}
.docs-link:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 24px;
}

.customer-bar, .banner, .agent, .tabs, .tab-panel { grid-column: 1 / -1; }

/* Each tab panel repeats the page grid so the existing cards keep their placement. */
.tab-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.tab-panel[hidden] { display: none; }

#tab-agent { --accent: var(--green); --accent-ink: var(--ink); }

/* ---------- cards ---------- */

.card {
  background: var(--surface);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: var(--border-thin);
}
.card-head h2 { margin: 0; font-size: 1.1rem; font-weight: 800; letter-spacing: -0.01em; }

/* ---------- tabs ---------- */

.tabs { display: flex; gap: 12px; }
.tab {
  padding: 10px 18px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 80ms ease;
}
.tab:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.tab[aria-selected="true"] { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
#tab-button-decision[aria-selected="true"] { background: var(--violet); color: #fff; }
#tab-button-agent[aria-selected="true"] { background: var(--green); }

/* ---------- customer bar ---------- */

.customer-bar { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 28px; }
.customer-form label, .presets-label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.input-row { display: flex; gap: 10px; }

input[type="text"] {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: var(--border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
}
input[type="text"]:focus { outline: none; box-shadow: var(--shadow-sm); }
input[type="text"]:disabled { background: var(--bg); border-color: var(--muted-ink); cursor: not-allowed; }
#customer-id, #chat-input { font-family: var(--font-mono); }

.preset-list { display: flex; flex-wrap: wrap; gap: 10px; }
.preset {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 6px 5px 10px;
  border: var(--border-thin);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 2px 2px 0 var(--ink);
  color: var(--ink);
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 80ms ease;
}
.preset:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.preset:active { transform: translate(1px, 1px); box-shadow: 1px 1px 0 var(--ink); }
.preset code { font-size: 0.8rem; font-weight: 600; }
.presets .hint { margin-top: 12px; }

/* ---------- buttons ---------- */

.btn {
  padding: 10px 16px;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font: inherit;
  font-weight: 800;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 80ms ease;
}
.btn:hover:not(:disabled) { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active:not(:disabled) { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-secondary { background: var(--surface); color: var(--ink); }
#handoff-button { background: var(--coral); color: var(--ink); }
.btn:disabled {
  border-color: var(--muted-ink);
  background: var(--muted);
  box-shadow: none;
  color: var(--muted-ink);
  cursor: not-allowed;
}
.btn.loading { cursor: progress; }

/* ---------- labels (only where they carry meaning) ---------- */

.badge {
  display: inline-block;
  padding: 3px 9px;
  border: var(--border-thin);
  border-radius: 999px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}
.badge-muted { border-color: var(--muted-ink); background: var(--bg); color: var(--muted-ink); }
.badge-success { background: var(--green); }
.badge-warning { background: var(--amber); }
.badge-danger { background: var(--coral); }
.badge-info { background: var(--cyan); }

.banner {
  padding: 12px 16px;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-weight: 700;
}
.banner-error { background: var(--coral); color: var(--ink); }

/* ---------- recommendation ---------- */

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 24px;
  margin: 0;
}
.metrics dt {
  color: var(--muted-ink);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.metrics dt small { font-weight: 600; letter-spacing: 0; text-transform: none; }
.metrics dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ---------- candidates ---------- */

.table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.table th, .table td { padding: 9px 8px; border-bottom: 2px solid var(--muted); text-align: left; }
.table th {
  border-bottom: var(--border);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.table .num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.table tr.top td { font-weight: 800; background: var(--bg); }
.table tr.top td:first-child { box-shadow: inset 5px 0 0 var(--violet); }
.table tr.empty td { color: var(--muted-ink); text-align: center; padding: 24px; }

/* ---------- execute ---------- */

.action-row { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.hint { margin: 0; color: var(--muted-ink); font-size: 0.85rem; }

.result h3 {
  margin: 10px 0 8px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.result-body {
  min-height: 44px;
  padding: 12px 14px;
  border: var(--border-thin);
  border-radius: var(--radius);
  background: var(--bg);
  font-size: 0.88rem;
}
.result-body dl { display: grid; grid-template-columns: max-content 1fr; gap: 5px 14px; margin: 0; }
.result-body dt { color: var(--muted-ink); font-weight: 700; }
.result-body dd { margin: 0; font-family: var(--font-mono); font-weight: 700; overflow-wrap: anywhere; }
.muted { color: var(--muted-ink); }

/* ---------- LangGraph workflow ---------- */

.toggle { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; cursor: pointer; }
.toggle input { width: 18px; height: 18px; accent-color: var(--violet); }

.flow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 14px;
  padding: 0;
  list-style: none;
}
.flow li {
  padding: 8px 12px;
  border: 2px dashed var(--muted-ink);
  border-radius: var(--radius);
  color: var(--muted-ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}
.flow li:not(.branch)::after { content: " →"; }
.flow li.active {
  border: var(--border-thin);
  background: var(--cyan);
  box-shadow: 2px 2px 0 var(--ink);
  color: var(--ink);
  font-weight: 800;
}
/* Terminal nodes take the colour of their outcome. */
.flow li.active[data-node="execute_offer"] { background: var(--green); }
.flow li.active[data-node="handoff"] { background: var(--coral); }
.flow li.active[data-node="no_action"] { background: var(--amber); }

.agent-message { margin: 0 0 12px; font-weight: 600; }

.footer {
  padding: 14px 0 32px;
  color: var(--muted-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: center;
}

/* ---------- customer agent ---------- */

#tab-agent { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); align-items: start; }

.chat { display: flex; flex-direction: column; gap: 14px; }
.chat .card-head { border-bottom-color: var(--ink); }
.chat-transcript {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 340px;
  max-height: 500px;
  overflow-y: auto;
  padding: 16px;
  border: var(--border-thin);
  border-radius: var(--radius);
  background: var(--bg);
}
.chat-empty { margin: auto; text-align: center; font-weight: 600; }

.bubble {
  max-width: 78%;
  padding: 10px 14px;
  border: var(--border-thin);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--ink);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.bubble-user { align-self: flex-end; background: var(--green); color: var(--ink); font-weight: 600; }
.bubble-assistant { align-self: flex-start; background: var(--surface); }

.typing { display: inline-flex; gap: 5px; align-items: center; }
.typing[hidden] { display: none; }
.typing span:not(.sr-only) {
  width: 8px;
  height: 8px;
  background: var(--ink);
  animation: typing 1s infinite ease-in-out;
}
.typing span:nth-child(3) { animation-delay: 0.15s; }
.typing span:nth-child(4) { animation-delay: 0.3s; }
@keyframes typing { 0%, 80%, 100% { opacity: 0.2; } 40% { opacity: 1; } }

.chat-form { display: flex; gap: 10px; }

/* Debug sits apart from the conversation: dashed, flat, and tagged for presenters. */
.debug {
  border-style: dashed;
  background: var(--bg);
  box-shadow: none;
}
.debug .card-head { border-bottom-style: dashed; }
.debug .card-head::after {
  content: "DEV";
  padding: 2px 8px;
  border: var(--border-thin);
  border-radius: 999px;
  background: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
}
.debug .result-body { background: var(--surface); font-size: 0.82rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 820px) {
  .layout, .customer-bar, .metrics, .tab-panel, #tab-agent { grid-template-columns: 1fr; }
  .topbar { padding: 14px 18px; }
  .layout { padding: 0 16px; }
}