:root {
  --bg: #0b0f14;
  --bg-elev: #121820;
  --bg-card: #161e28;
  --border: #243041;
  --text: #e6edf5;
  --muted: #8b9bb0;
  --accent: #3dd6c6;
  --accent-dim: #1f8f84;
  --warn: #f0a202;
  --danger: #ef476f;
  --ok: #57cc99;
  --chat-user: #1a2740;
  --chat-asst: #15231f;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", monospace;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  color: var(--accent);
}

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #10161f 0%, var(--bg) 100%);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.logo {
  color: var(--accent);
  font-size: 22px;
  line-height: 1;
}

.brand h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 0 transparent;
  transition: background 0.2s, box-shadow 0.2s;
}

.status .dot.ok {
  background: var(--ok);
  box-shadow: 0 0 8px rgba(87, 204, 153, 0.5);
}

.status .dot.busy {
  background: var(--warn);
  box-shadow: 0 0 8px rgba(240, 162, 2, 0.55);
  animation: pulse 1s infinite;
}

.status .dot.err {
  background: var(--danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.sep { opacity: 0.4; }

/* ---- tabs ---- */
.tabs {
  display: flex;
  gap: 4px;
  padding: 10px 18px 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}

.tab {
  appearance: none;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  font: inherit;
  font-weight: 560;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--text);
  background: var(--bg);
  border-color: var(--border);
  position: relative;
  top: 1px;
}

/* ---- panels ---- */
main { padding: 18px 22px 40px; }

.panel { display: none; }
.panel.active { display: block; }

/* ---- chat ---- */
.chat-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 16px;
  min-height: calc(100vh - 200px);
}

.chat-main {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 420px;
  overflow: hidden;
}

.chat-log {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 10px;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid var(--border);
}

.msg.user {
  align-self: flex-end;
  background: var(--chat-user);
}

.msg.assistant {
  align-self: flex-start;
  background: var(--chat-asst);
}

.msg .role {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 4px;
}

.msg .sources {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed var(--border);
  font-size: 11px;
  color: var(--muted);
}

.chat-controls .check {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-direction: row;
}

.msg.streaming::after {
  content: "▍
  animation: blink 0.9s step-end infinite;
  color: var(--accent);
  margin-left: 2px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.chat-form {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
}

.chat-form textarea {
  resize: vertical;
  min-height: 48px;
  max-height: 160px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}

.chat-controls {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: fit-content;
}

.chat-controls h2 {
  margin: 0 0 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}

input[type="number"],
input[type="text"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 9px;
  font: inherit;
}

button {
  appearance: none;
  border: 1px solid var(--accent-dim);
  background: linear-gradient(180deg, #2bb8a9, var(--accent-dim));
  color: #04120f;
  font: inherit;
  font-weight: 650;
  padding: 9px 14px;
  border-radius: 8px;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }
button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: none;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.hint {
  color: var(--muted);
  font-size: 12px;
  margin: 4px 0 0;
}

/* ---- telemetry ---- */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

.metric {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.metric.headline {
  border-color: var(--danger);
  box-shadow: inset 0 0 0 1px rgba(239, 71, 111, 0.15);
}

.m-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 4px;
}

.m-val {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 600;
}

.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px 10px;
}

.card.wide { grid-column: 1 / -1; }

.card h2 {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card h2 .sub {
  color: var(--danger);
  font-weight: 500;
  font-size: 11px;
  margin-left: 6px;
}

.heatmap-wrap {
  position: relative;
  width: 100%;
  overflow-x: auto;
}

.io-card .kv {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px 16px;
}

.io-card .kv div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.io-card .kv span {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.io-card .kv b {
  font-family: var(--mono);
  font-weight: 560;
  font-size: 15px;
}

/* ---- models ---- */
.models-bar {
  display: flex;
  gap: 10px;
  align-items: end;
  margin-bottom: 14px;
}

.models-bar .grow { flex: 1; }

.models-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.model-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
  word-break: break-all;
}

.model-card .path {
  color: var(--muted);
  font-size: 11px;
  font-family: var(--mono);
  margin-bottom: 10px;
  word-break: break-all;
}

.model-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  margin: 0;
  font-size: 13px;
}

.model-card dt { color: var(--muted); }
.model-card dd {
  margin: 0;
  font-family: var(--mono);
  text-align: right;
}

/* ---- converter ---- */
.convert-form {
  display: grid;
  gap: 12px;
  max-width: 640px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.convert-form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}

.convert-form input,
.convert-form select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 10px;
  font: inherit;
}

.cmd-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.cmd-box code {
  flex: 1;
  background: transparent;
  white-space: pre-wrap;
  word-break: break-all;
  font-size: 13px;
  color: var(--ok);
  padding: 0;
}

/* ---- footer ---- */
footer {
  padding: 12px 22px 24px;
  color: var(--muted);
  font-size: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  border-top: 1px solid var(--border);
}

/* ---- responsive ---- */
@media (max-width: 960px) {
  .chat-layout { grid-template-columns: 1fr; }
  .metrics-row { grid-template-columns: repeat(3, 1fr); }
  .chart-grid { grid-template-columns: 1fr; }
  .io-card .kv { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .metrics-row { grid-template-columns: repeat(2, 1fr); }
}