/* Research Lab — Linear/Vercel-inspired dashboard system
   UI sans + mono numerics, dark slate */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg:        oklch(0.148 0.008 260);
  --bg-elev:   oklch(0.175 0.009 260);
  --panel:     oklch(0.198 0.010 260);
  --panel-2:   oklch(0.232 0.012 260);
  --panel-3:   oklch(0.275 0.014 260);
  --rule:      oklch(0.30 0.012 260);
  --rule-soft: oklch(0.24 0.010 260);
  --ink:       oklch(0.965 0.005 260);
  --ink-2:     oklch(0.78 0.010 260);
  --ink-3:     oklch(0.58 0.012 260);
  --ink-4:     oklch(0.42 0.012 260);

  --accent:    oklch(0.72 0.14 255);
  --accent-2:  oklch(0.72 0.14 255 / 0.15);
  --good:      oklch(0.78 0.16 155);
  --good-soft: oklch(0.78 0.16 155 / 0.14);
  --bad:       oklch(0.68 0.20 25);
  --bad-soft:  oklch(0.68 0.20 25 / 0.14);
  --amber:     oklch(0.82 0.14 85);
  --amber-soft: oklch(0.82 0.14 85 / 0.14);

  --ui:   'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.005em;
}
a { color: inherit; text-decoration: none; }

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--rule-soft);
  background: var(--bg-elev);
  position: sticky; top: 0; z-index: 10;
}
.topbar-left {
  display: flex; align-items: center; gap: 20px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600;
  font-size: 14px;
}
.brand-mark {
  width: 24px; height: 24px;
  border: 1px solid var(--rule);
  background: var(--panel);
  display: grid; place-items: center;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  border-radius: 6px;
}
.nav {
  display: flex; gap: 2px;
}
.nav a {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--ink-3);
  border-radius: 6px;
  transition: background .1s, color .1s;
}
.nav a:hover { color: var(--ink); background: var(--panel); }
.nav a.active { color: var(--ink); background: var(--panel); }

.topbar-meta {
  display: flex; gap: 14px; align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
}

/* ---------- container ---------- */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px 24px 80px;
}
@media (max-width: 720px) {
  .topbar { padding: 12px 16px; }
  .container { padding: 20px 16px 60px; }
  .nav { display: none; }
}

/* ---------- page head ---------- */
.page-head {
  margin-bottom: 28px;
}
.page-kicker {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.page-title {
  font-size: 28px;
  font-weight: 600;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}
.page-sub {
  color: var(--ink-3);
  font-size: 14px;
  max-width: 70ch;
}

/* ---------- card ---------- */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  padding: 18px;
}
.card-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.card-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
}
.card-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
}

/* ---------- filter row ---------- */
.filter-row {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  margin-bottom: 18px;
}
.seg {
  display: inline-flex;
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-elev);
}
.seg button {
  background: transparent;
  border: none;
  color: var(--ink-3);
  padding: 6px 12px;
  font-family: var(--ui);
  font-size: 12px;
  cursor: pointer;
  border-right: 1px solid var(--rule-soft);
  font-weight: 500;
}
.seg button:last-child { border-right: none; }
.seg button:hover { color: var(--ink); }
.seg button.on { color: var(--ink); background: var(--panel); }

.search {
  flex: 1; min-width: 160px;
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
  padding: 6px 12px;
  color: var(--ink);
  font-family: var(--ui);
  font-size: 13px;
}
.search:focus { outline: none; border-color: var(--accent); }

/* ---------- runs list (index) ---------- */
.runs-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  overflow: hidden;
}
.run-row {
  background: var(--bg-elev);
  padding: 14px 18px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  cursor: pointer;
  transition: background .1s;
}
.run-row:hover { background: var(--panel); }
.run-row-left {
  display: flex; align-items: center; gap: 12px; min-width: 0;
}
.run-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  min-width: 76px;
}
.kind-chip {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--rule);
  letter-spacing: 0.04em;
}
.kind-chip.run        { color: var(--accent); border-color: oklch(0.72 0.14 255 / 0.4); background: var(--accent-2); }
.kind-chip.session    { color: var(--amber); border-color: oklch(0.82 0.14 85 / 0.35); background: var(--amber-soft); }
.kind-chip.experiment { color: var(--ink-3); }

.run-title-block { min-width: 0; flex: 1; }
.run-title { font-weight: 500; font-size: 14px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.run-version { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
.run-summary { font-size: 12px; color: var(--ink-3); margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.run-metrics {
  display: flex; gap: 16px;
  font-family: var(--mono); font-variant-numeric: tabular-nums;
}
.run-metric {
  display: flex; flex-direction: column; gap: 1px; align-items: flex-end;
  min-width: 54px;
}
.run-metric .l { font-size: 9.5px; color: var(--ink-4); text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--ui); }
.run-metric .v { font-size: 13px; color: var(--ink); font-weight: 500; }
.run-metric .v.good { color: var(--good); }
.run-metric .v.bad { color: var(--bad); }

@media (max-width: 820px) {
  .run-row { grid-template-columns: 1fr; gap: 10px; }
  .run-metrics { flex-wrap: wrap; }
  .run-metric { align-items: flex-start; }
}

/* ---------- run dashboard header ---------- */
.run-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 24px;
}
@media (min-width: 900px) {
  .run-head { grid-template-columns: 1.5fr 1fr; }
}
.run-head .hero-block {
  display: flex; flex-direction: column; gap: 10px;
}
.run-crumbs {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
}
.run-crumbs a:hover { color: var(--accent); }
.run-crumbs .sep { color: var(--ink-4); }
.run-title-big {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.run-title-big .ver {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-3);
  background: var(--panel);
  border: 1px solid var(--rule-soft);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0;
}
.run-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.status-chip {
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--rule);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.status-chip.done   { color: var(--accent); border-color: oklch(0.72 0.14 255 / 0.35); background: var(--accent-2); }
.status-chip.frozen { color: var(--amber);  border-color: oklch(0.82 0.14 85 / 0.35); background: var(--amber-soft); }
.status-chip.live   { color: var(--good);   border-color: oklch(0.78 0.16 155 / 0.35); background: var(--good-soft); }
.status-chip.draft  { color: var(--ink-3); }

/* ---------- metric grid ---------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  overflow: hidden;
  margin: 18px 0;
}
@media (min-width: 760px) { .metrics { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 1100px) { .metrics { grid-template-columns: repeat(7, 1fr); } }

.metric {
  background: var(--bg-elev);
  padding: 14px 16px;
  display: flex; flex-direction: column; gap: 5px;
}
.metric-label {
  font-size: 10.5px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}
.metric-value {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.metric-delta {
  font-family: var(--mono);
  font-size: 11px;
  display: inline-flex; align-items: center; gap: 3px;
}
.metric-delta.up   { color: var(--good); }
.metric-delta.down { color: var(--bad); }
.metric-delta.flat { color: var(--ink-4); }

/* ---------- section ---------- */
.section {
  margin-top: 28px;
}
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 12px;
  gap: 12px;
}
.section-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex; align-items: center; gap: 8px;
}
.section-title::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%;
  background: var(--ink-4);
}
.section-meta { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }

/* ---------- 2-col grid ---------- */
.split-2 {
  display: grid; grid-template-columns: 1fr; gap: 12px;
}
@media (min-width: 900px) { .split-2 { grid-template-columns: 1.5fr 1fr; } }
.split-eq-mo {
  display: grid; grid-template-columns: 1fr; gap: 12px;
}
@media (min-width: 900px) { .split-eq-mo { grid-template-columns: 1fr 1fr; } }

/* ---------- svg chart ---------- */
svg.chart { width: 100%; display: block; }

/* ---------- tables ---------- */
.tbl-wrap {
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  background: var(--bg-elev);
  overflow: hidden;
}
.tbl-scroll { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
}
table.data th, table.data td {
  text-align: left;
  padding: 9px 14px;
  font-size: 12.5px;
  white-space: nowrap;
  border-bottom: 1px solid var(--rule-soft);
}
table.data th {
  font-size: 10.5px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  background: var(--panel);
}
table.data td.num, table.data th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
table.data tbody tr:hover { background: var(--panel); }
table.data tbody tr:last-child td { border-bottom: none; }
table.data td.good { color: var(--good); }
table.data td.bad { color: var(--bad); }
table.data td.sym { font-weight: 500; }

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--rule);
  color: var(--ink-2);
}
.pill.long, .pill.good { color: var(--good); border-color: oklch(0.78 0.16 155 / 0.3); background: var(--good-soft); }
.pill.short, .pill.bad { color: var(--bad); border-color: oklch(0.68 0.20 25 / 0.3); background: var(--bad-soft); }
.pill.neutral { color: var(--amber); border-color: oklch(0.82 0.14 85 / 0.3); background: var(--amber-soft); }

/* ---------- params ---------- */
.params {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
  overflow: hidden;
}
@media (min-width: 720px) { .params { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .params { grid-template-columns: repeat(4, 1fr); } }
.param {
  background: var(--bg-elev);
  padding: 10px 14px;
  display: flex; flex-direction: column; gap: 2px;
}
.param.changed { background: oklch(0.22 0.06 85 / 0.25); }
.param .k {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-4);
  letter-spacing: 0.02em;
}
.param .v {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  font-weight: 500;
}
.param .diff {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  margin-top: 2px;
}
.param .diff .old { color: var(--ink-4); text-decoration: line-through; }
.param .diff .arrow { color: var(--accent); margin: 0 4px; }

/* ---------- changes vs parent ---------- */
.changes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
@media (min-width: 820px) { .changes { grid-template-columns: 1fr 1fr; } }
.change-block {
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  overflow: hidden;
}
.change-block-head {
  padding: 10px 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  background: var(--panel);
  border-bottom: 1px solid var(--rule-soft);
  display: flex; justify-content: space-between; align-items: center;
}
.change-list { padding: 6px 0; }
.change-item {
  padding: 8px 14px;
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: baseline;
  font-size: 12.5px;
  border-bottom: 1px solid var(--rule-soft);
}
.change-item:last-child { border-bottom: none; }
.change-item .k { color: var(--ink-2); font-weight: 500; }
.change-item .before { font-family: var(--mono); color: var(--ink-3); text-decoration: line-through; }
.change-item .arrow { color: var(--ink-4); }
.change-item .after { font-family: var(--mono); font-weight: 500; }
.change-item .after.up   { color: var(--good); }
.change-item .after.down { color: var(--bad); }
.change-item .after.flat { color: var(--ink); }

/* ---------- verification checklist ---------- */
.checklist {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule-soft);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--rule-soft);
}
.check-item {
  background: var(--bg-elev);
  padding: 10px 14px;
  display: flex; align-items: center; gap: 10px;
  font-size: 13px;
}
.check-box {
  width: 18px; height: 18px;
  border-radius: 4px;
  border: 1px solid var(--rule);
  display: grid; place-items: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-4);
  flex: none;
}
.check-box.on {
  background: var(--good-soft);
  border-color: oklch(0.78 0.16 155 / 0.4);
  color: var(--good);
}
.check-item.done .check-label { color: var(--ink); }
.check-label { color: var(--ink-3); }

/* ---------- compare ---------- */
.compare-pickers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 20px;
}
@media (min-width: 720px) { .compare-pickers { grid-template-columns: 1fr 1fr; } }
.picker {
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  padding: 14px 16px;
}
.picker select {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 6px;
  margin-top: 6px;
}
.picker .lbl {
  font-size: 11px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}
.picker.a { border-left: 3px solid var(--ink-3); }
.picker.b { border-left: 3px solid var(--accent); }

.compare-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  overflow: hidden;
}
.cm-row {
  background: var(--bg-elev);
  display: grid;
  grid-template-columns: 110px 1fr 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px 18px;
}
.cm-row.head {
  background: var(--panel);
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-4); font-weight: 500;
}
.cm-row .k { color: var(--ink-2); font-weight: 500; }
.cm-row .v { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 14px; }
.cm-row .v.a { color: var(--ink-3); }
.cm-row .v.b { color: var(--ink); font-weight: 500; }
.cm-row .delta {
  font-family: var(--mono); font-size: 12px;
  padding: 3px 8px; border-radius: 4px;
  min-width: 70px; text-align: right;
}
.cm-row .delta.up   { color: var(--good); background: var(--good-soft); }
.cm-row .delta.down { color: var(--bad); background: var(--bad-soft); }
.cm-row .delta.flat { color: var(--ink-4); background: var(--panel); }

/* ---------- empty state ---------- */
.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-3);
  font-size: 13px;
}

/* ---------- sidebar (for run page) ---------- */
.sidebar-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 1100px) {
  .sidebar-layout { grid-template-columns: 240px minmax(0, 1fr); gap: 28px; }
}
.run-sidebar {
  border-right: 0;
  padding: 0;
}
@media (min-width: 1100px) {
  .run-sidebar {
    border-right: 1px solid var(--rule-soft);
    padding-right: 20px;
    position: sticky; top: 72px;
    max-height: calc(100vh - 88px);
    overflow-y: auto;
  }
}
.sb-label {
  font-size: 10px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 14px 0 8px;
}
.sb-list {
  display: flex; flex-direction: column; gap: 1px;
}
.sb-item {
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--ink-3);
  display: flex; align-items: center; gap: 8px;
  cursor: pointer;
}
.sb-item:hover { background: var(--panel); color: var(--ink); }
.sb-item.active { background: var(--panel); color: var(--ink); }
.sb-item .sb-date {
  font-family: var(--mono); font-size: 10px; color: var(--ink-4); flex: none;
}
.sb-item .sb-ttl { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- summary timeline on index ---------- */
.sparkpanel {
  display: grid; grid-template-columns: 1fr; gap: 12px;
  margin-bottom: 24px;
}
@media (min-width: 720px) { .sparkpanel { grid-template-columns: repeat(4, 1fr); } }
.spark-card {
  background: var(--bg-elev);
  border: 1px solid var(--rule-soft);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex; flex-direction: column; gap: 6px;
}
.spark-card .l { font-size: 10.5px; color: var(--ink-4); text-transform: uppercase; letter-spacing: 0.08em; }
.spark-card .v { font-family: var(--mono); font-size: 18px; font-weight: 500; color: var(--ink); }

/* ---------- anchor spacing ---------- */
.section[id] { scroll-margin-top: 80px; }