:root {
  --bg:        #0a0a0c;
  --bg-1:      #131316;
  --bg-2:      #1a1a1f;
  --fg:        #e7e7ea;
  --fg-2:      #a8a8b0;
  --fg-3:      #6e6e78;
  --fg-4:      #46464e;
  --acc:       #f59e0b;
  --acc-soft:  rgba(245, 158, 11, 0.12);
  --border:    #232328;
  --border-hi: #3a3a42;
  --ok:        #22c55e;
  --err:       #ef4444;
  --rad:       3px;
  --rad-lg:    5px;
  --mono:      'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Monaco, monospace;
  --sans:      'Inter', -apple-system, system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 14px;
  font-feature-settings: 'tnum' 1, 'cv11' 1;
  -webkit-font-smoothing: antialiased;
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

header.top {
  border-bottom: 1px solid var(--border);
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 14px;
}
header.top .brand {
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
}
header.top .brand::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--acc);
  transform: rotate(45deg);
  margin-right: 9px;
  position: relative;
  top: 0;
}
header.top .tag {
  color: var(--fg-3);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}
header.top .meta {
  margin-left: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--fg-3);
}
header.top .meta a {
  color: var(--fg-2);
  text-decoration: none;
  border-bottom: 1px dashed var(--border-hi);
}

/* Locale switch — sits between the tag and the meta block, auto-pushed left */
.locale-switch {
  margin-left: auto;
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--rad);
  overflow: hidden;
  font-family: var(--mono);
}
.locale-switch .loc-btn {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  border: none;
  background: transparent;
  color: var(--fg-3);
  cursor: pointer;
  text-transform: none;
}
.locale-switch .loc-btn + .loc-btn { border-left: 1px solid var(--border); }
.locale-switch .loc-btn:hover { color: var(--fg-2); }
.locale-switch .loc-btn.on {
  background: var(--acc);
  color: #14140d;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: 0;
}

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

.col {
  padding: 22px 26px;
  overflow-y: auto;
  min-height: 0;
}
.col.left {
  border-right: 1px solid var(--border);
  background: var(--bg-1);
}

h1, h2 {
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}
h1 { font-size: 20px; }
h2 {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-weight: 500;
  margin-top: 24px;
}

p.intro {
  color: var(--fg-2);
  line-height: 1.55;
  margin: 0 0 22px;
  max-width: 56ch;
}

label.q-label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 8px;
}
textarea#q {
  width: 100%;
  min-height: 110px;
  resize: vertical;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 12px 13px;
  color: var(--fg);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.5;
  outline: none;
}
textarea#q:focus {
  border-color: var(--acc);
  background: var(--bg);
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
button {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 9px 15px;
  border-radius: var(--rad);
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-2);
  color: var(--fg);
  transition: border-color 0.12s, background 0.12s;
}
button:hover { border-color: var(--border-hi); }
button.primary {
  background: var(--acc);
  color: #14140d;
  border-color: var(--acc);
}
button.primary:disabled {
  background: var(--bg-2);
  color: var(--fg-4);
  border-color: var(--border);
  cursor: not-allowed;
}
button.ghost { background: transparent; color: var(--fg-3); }

.examples {
  margin-top: 28px;
}
.examples ul { list-style: none; padding: 0; margin: 8px 0 0; }
.examples li {
  padding: 9px 11px;
  margin-bottom: 6px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  font-size: 12px;
  color: var(--fg-2);
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
}
.examples li:hover { border-color: var(--acc); color: var(--fg); }

/* RIGHT column */
#trace {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
}
.ev {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 10px;
  padding: 6px 10px;
  border-left: 2px solid var(--border);
  background: transparent;
}
.ev .badge {
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 2px;
  flex-shrink: 0;
}
.ev .body { min-width: 0; overflow: hidden; }
.ev .body .detail { color: var(--fg-3); word-break: break-word; }
.ev .ts {
  font-size: 10px;
  color: var(--fg-4);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.ev .ts.done { color: var(--fg-3); }
.ev.thinking      { border-left-color: var(--fg-3); }
.ev.thinking .badge   { color: var(--fg-2); border: 1px solid var(--border); }
.ev.tool_call     { border-left-color: var(--acc); }
.ev.tool_call .badge  { background: var(--acc-soft); color: var(--acc); }
.ev.tool_result   { border-left-color: var(--ok); }
.ev.tool_result .badge { color: var(--ok); }
.ev.tool_error    { border-left-color: var(--err); }
.ev.tool_error .badge  { color: var(--err); }
.ev .name { color: var(--fg); font-weight: 600; }
.ev .kv { color: var(--fg-3); margin-right: 6px; }
.ev .kv .k { color: var(--fg-2); }
.ev .kv .v { color: var(--fg); }

/* Live event — animated bar on the left edge + ticking timestamp */
.ev.live {
  background: linear-gradient(90deg, var(--acc-soft) 0%, transparent 60%);
}
.ev.live .ts::after {
  content: ' ⟳';
  display: inline-block;
  animation: spin 1.4s linear infinite;
  color: var(--acc);
}
@keyframes spin {
  from { transform: rotate(0); } to { transform: rotate(360deg); }
}

/* Top-right elapsed timer next to the section title */
.elapsed {
  font-size: 10.5px;
  color: var(--fg-3);
  margin-left: 10px;
  letter-spacing: 0.04em;
}
.elapsed.live { color: var(--acc); }
.elapsed.live::before { content: '● '; }

/* Answer-row toolbar (share button) */
.row-h2 {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.answer-toolbar {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.toolbar-btn {
  font-family: var(--sans);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 5px 10px;
  background: transparent;
  color: var(--fg-2);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  cursor: pointer;
  transition: border-color .12s, color .12s;
}
.toolbar-btn:hover { border-color: var(--acc); color: var(--fg); }
.share-feedback {
  font-size: 10.5px;
  color: var(--fg-3);
}
.share-feedback.ok { color: var(--ok); }
.share-feedback code {
  background: rgba(255,255,255,0.06);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 10.5px;
}

/* Snapshot banner — shown when viewing /r/{id} */
.snapshot-banner {
  font-family: var(--mono);
  font-size: 11px;
  padding: 9px 12px;
  margin-bottom: 12px;
  background: var(--acc-soft);
  border-left: 3px solid var(--acc);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--fg-2);
}
.snapshot-banner code {
  background: rgba(0,0,0,0.3);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 10px;
  margin: 0 4px;
}
.snapshot-banner a {
  color: var(--acc);
  text-decoration: none;
  font-weight: 600;
}
.snapshot-banner a:hover { color: var(--acc-2); }

/* In-answer hyperlinks for mp-ids */
#answer .mp-link {
  color: var(--acc);
  text-decoration: none;
  border-bottom: 1px dashed var(--acc-soft);
  font-family: var(--mono);
  font-size: 0.95em;
}
#answer .mp-link:hover {
  color: var(--acc-2);
  border-bottom-color: var(--acc);
}
#answer .cif-link {
  font-family: var(--mono);
  font-size: 0.7em;
  color: var(--fg-3);
  text-decoration: none;
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 2px;
  margin-left: 1px;
  vertical-align: 0.1em;
  transition: color .12s, border-color .12s;
}
#answer .cif-link:hover {
  color: var(--acc);
  border-color: var(--acc);
}

/* Inline phase-diagram visualisation (under a get_phase_diagram tool_result row) */
.viz-holder {
  grid-column: 1 / -1;
  padding: 8px 0 4px 28px;
}
svg.phase-diagram {
  width: 100%;
  max-width: 460px;
  height: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--rad-lg);
  display: block;
  padding: 4px;
}
svg.phase-diagram .pt.stable     { fill: var(--acc); stroke: var(--acc-2); stroke-width: 0.6; cursor: pointer; }
svg.phase-diagram .pt.metastable { fill: none; stroke: var(--fg-3); stroke-width: 1.1; cursor: pointer; }
svg.phase-diagram .pt:hover      { stroke: var(--acc-2); stroke-width: 1.6; }
svg.phase-diagram .axis-label    { fill: var(--fg-3); font-size: 9.5px; font-family: var(--sans); text-anchor: middle; }
svg.phase-diagram .tick-label    { fill: var(--fg-4); font-size: 9px; font-family: var(--mono); text-anchor: end; }
svg.phase-diagram .chart-title   { fill: var(--fg-2); font-size: 9.5px; letter-spacing: 0.06em; font-family: var(--mono); text-transform: uppercase; }
svg.phase-diagram .legend-label  { fill: var(--fg-3); font-size: 9px; font-family: var(--mono); }

/* References block beneath the answer */
.references-block {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--rad-lg);
  font-size: 12.5px;
}
.references-block h3 {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--fg-3);
}
.references-block .references-caption {
  margin: 0 0 10px;
  color: var(--fg-3);
  font-size: 11.5px;
}
.references-block ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 6px 14px;
}
.references-block li {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-3);
}
.references-block li a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px dashed var(--border-hi);
}
.references-block li a:hover {
  color: var(--acc);
  border-bottom-color: var(--acc);
}
.references-block .ref-host {
  font-size: 9.5px;
  letter-spacing: 0.04em;
  color: var(--fg-4);
}

/* Provenance block — sits below references, same visual weight, tabular layout */
.provenance-block {
  margin-top: 14px;
  padding: 14px 18px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--rad-lg);
  font-size: 11px;
}
.provenance-block h3 {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--fg-3);
}
.provenance-block dl {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 14px;
}
.provenance-block dt {
  color: var(--fg-4);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.provenance-block dd {
  margin: 0;
  color: var(--fg-2);
  font-size: 11px;
}

#answer {
  margin-top: 14px;
  padding: 18px 20px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--rad-lg);
  font-size: 14px;
  line-height: 1.6;
  color: var(--fg);
  white-space: pre-wrap;
  min-height: 80px;
}
#answer:empty::before {
  content: attr(data-empty-msg);
  color: var(--fg-4);
  font-style: italic;
  font-size: 12.5px;
}
#answer h1, #answer h2, #answer h3 {
  font-weight: 600;
  letter-spacing: -0.01em;
}
#answer h3 { font-size: 14px; margin: 18px 0 6px; }
#answer h2 {
  font-size: 13px; letter-spacing: 0; text-transform: none; color: var(--fg);
  margin: 22px 0 8px;
}
#answer code {
  font-family: var(--mono);
  font-size: 11.5px;
  background: rgba(255,255,255,0.06);
  padding: 1px 5px;
  border-radius: 2px;
}
#answer table {
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 12.5px;
  width: 100%;
}
#answer th, #answer td {
  text-align: left;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
}
#answer th {
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-3);
  font-weight: 500;
}
#answer ul, #answer ol { padding-left: 22px; }
#answer li { margin: 3px 0; }

.status {
  font-size: 10.5px;
  font-family: var(--mono);
  color: var(--fg-3);
  margin-top: 14px;
  letter-spacing: 0.03em;
}
.status.live::before {
  content: '●';
  color: var(--acc);
  margin-right: 6px;
  animation: pulse 1.4s infinite;
}
.status.done::before {
  content: '●';
  color: var(--ok);
  margin-right: 6px;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

footer {
  padding: 12px 22px;
  border-top: 1px solid var(--border);
  font-size: 10.5px;
  color: var(--fg-3);
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
footer a { color: var(--fg-2); text-decoration: none; border-bottom: 1px dashed var(--border-hi); }