/* Sceance Ledger — operator dashboard.
   High-contrast dark theme, color-blind-safe palette (Okabe-Ito).
   Sans-serif only (IBM Plex Sans) + JetBrains Mono for figures. */

:root {
  /* surfaces */
  --bg:           #0e0e10;
  --surface:      #18181b;
  --surface-2:    #1f1f23;
  --rule:         #34343a;
  --rule-soft:    #26262b;

  /* text — all maintain >= 6:1 contrast on --bg */
  --text:         #f5f5f7;   /* primary       (~18:1) */
  --text-2:       #d4d4d8;   /* secondary     (~12:1) */
  --text-3:       #a1a1aa;   /* tertiary      (~ 7:1) */

  /* accents — Okabe-Ito color-blind-safe palette */
  --accent:       #e69f00;   /* orange  (assistant, brand) */
  --blue:         #56b4e9;   /* sky blue (user) */
  --green:        #009e73;   /* bluish green (success) */
  --vermillion:   #d55e00;   /* live / alert */
  --yellow:       #f0e442;
  --purple:       #cc79a7;

  --sans:  "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  padding: 0 5vw 6rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Masthead ─────────────────────────────────────────────────────── */
.masthead {
  padding: 3rem 0 1.75rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
  border-bottom: 1px solid var(--rule);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.7rem;
  font-weight: 500;
}
.title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--text);
}
.subtitle {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--text-2);
  margin: 0.55rem 0 0;
  max-width: 38rem;
}
.period {
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  border: 1px solid var(--rule);
  background: var(--surface);
  border-radius: 4px;
}
.period button {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--text-2);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  border-radius: 2px;
  transition: color 120ms, background 120ms;
}
.period button:hover { color: var(--text); }
.period button.active {
  color: var(--bg);
  background: var(--accent);
}

/* ─── Aggregate KPIs ───────────────────────────────────────────────── */
.aggregate {
  margin: 2rem 0 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
  overflow: hidden;
}
.kpi {
  padding: 1.25rem 1.25rem;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.kpi:last-child { border-right: 0; }
.kpi .label {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}
.kpi .value {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.05;
}
.kpi .value .unit {
  color: var(--text-3);
  font-size: 0.6em;
  margin-left: 0.3em;
  letter-spacing: 0;
}
.kpi .accent-rule {
  width: 28px;
  height: 2px;
  background: var(--accent);
  margin-top: 0.15rem;
  border-radius: 1px;
}
.kpi .sub {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--text-2);     /* WAS the barely-visible italic line */
  font-weight: 400;
}
.agg-placeholder {
  grid-column: 1 / -1;
  padding: 1.5rem;
  color: var(--text-2);
}

/* ─── TTFB row ─────────────────────────────────────────────────────── */
.ttfb-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0 2.5rem;
  padding: 1rem 0 1.5rem;
  border-bottom: 1px solid var(--rule);
}
.ttfb-pill {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0;
}
.ttfb-pill .who {
  font-family: var(--mono);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--accent);
}
.ttfb-pill .v {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--text);
  font-size: 1rem;
}
.ttfb-pill .n {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--text-2);     /* WAS barely-visible italic */
}

/* ─── Sessions list ────────────────────────────────────────────────── */
.sessions { margin-top: 2.5rem; }
.sessions-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.sessions-head h2 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--text);
}
.session-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.session-list li.loading {
  padding: 1.25rem 0;
  color: var(--text-2);
}
.session {
  border-bottom: 1px solid var(--rule-soft);
  padding: 1rem 0;
  cursor: pointer;
  transition: background 120ms;
}
.session:hover { background: var(--surface); }
.session.open  { background: var(--surface-2); }

.session-row {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr 0.7fr 0.9fr 1.1fr auto;
  align-items: baseline;
  gap: 1rem;
  padding: 0 0.75rem;
}
.s-persona {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}
.s-persona .lang {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--bg);
  background: var(--accent);
  margin-left: 0.5rem;
  padding: 0.15em 0.5em;
  vertical-align: middle;
  position: relative;
  top: -2px;
  border-radius: 2px;
}
.s-date, .s-dur, .s-tok, .s-msgs {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-2);
}
.s-tok .small { color: var(--text-3); }
.s-chev {
  color: var(--text-3);
  font-family: var(--mono);
  transition: transform 120ms, color 120ms;
}
.session.open .s-chev { transform: rotate(90deg); color: var(--accent); }
.session.live .s-dur::after {
  content: "● LIVE";
  color: var(--vermillion);
  margin-left: 0.4rem;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  font-weight: 500;
}

/* expanded detail */
.detail {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 0.95fr 1.5fr;
  gap: 2rem;
  padding: 1.25rem 0.75rem 0.5rem;
  border-top: 1px solid var(--rule);
}
@media (max-width: 820px) {
  .detail { grid-template-columns: 1fr; }
  .session-row { grid-template-columns: 1fr auto; }
  .s-date, .s-dur, .s-tok, .s-msgs { grid-column: 1; }
}
.detail h3 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 0 0 0.7rem;
}

/* metrics column */
.meta-grid {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.4rem 1rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  margin-bottom: 1.5rem;
}
.meta-grid dt { color: var(--text-3); }
.meta-grid dd { margin: 0; color: var(--text); }

.metrics-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text);
}
.metrics-table th, .metrics-table td {
  text-align: left;
  padding: 0.5rem 0.6rem 0.5rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.metrics-table th {
  color: var(--text-3);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.68rem;
}
.metrics-table td.num { text-align: right; color: var(--text); padding-right: 0; }
.metrics-table td.empty { color: var(--text-2); padding: 0.75rem 0; }

/* response latency block */
.lat-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
  margin-bottom: 0.75rem;
}
.lat-stat {
  padding: 0.65rem 0.75rem;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.lat-stat:last-child { border-right: 0; }
.lat-stat-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-3);
  font-weight: 500;
}
.lat-stat-value {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--text);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.lat-chart {
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
  padding: 0.5rem 0.5rem 0.25rem;
  margin-bottom: 1.5rem;
}
.lat-svg { display: block; width: 100%; height: auto; }

/* transcript column */
.transcript {
  max-height: 580px;
  overflow-y: auto;
  padding-right: 0.5rem;
  scrollbar-color: var(--rule) transparent;
  scrollbar-width: thin;
}
.transcript .turn {
  margin-bottom: 1.1rem;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
}
.transcript .turn .who {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.25rem;
}
.transcript .turn.user .who      { color: var(--blue); }
.transcript .turn.assistant .who { color: var(--accent); }
.transcript .turn.system .who    { color: var(--purple); }
.transcript .turn.user      { border-left-color: var(--blue); }
.transcript .turn.assistant { border-left-color: var(--accent); }
.transcript .turn.system    { border-left-color: var(--purple); }
.transcript .turn .text {
  font-family: var(--sans);
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--text);
  white-space: pre-wrap;
}
.transcript .turn.system .text { color: var(--text-2); }
.transcript .empty {
  color: var(--text-2);
  padding: 1rem 0;
}

/* ─── Pager ───────────────────────────────────────────────────────── */
.pager {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-2);
}
.pager button {
  appearance: none;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--text);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 120ms, color 120ms, background 120ms;
}
.pager button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
.pager button:disabled { opacity: 0.35; cursor: not-allowed; }
.pager .pos { letter-spacing: 0.14em; color: var(--text-2); }

/* ─── Footer ──────────────────────────────────────────────────────── */
.footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}
.footer a { color: var(--accent); }
.footer a:hover { color: var(--accent); text-decoration: underline; }