/* ==========================================================================
   TCVALPHA — shared theme
   Ground: cold slate paper. Accent: oxide (structure, links, hover) only.
   Numeric sign uses its own semantic scale (pos/neg/warn) so the accent
   never competes with the data.
   ========================================================================== */

:root {
  --paper:   #EEF0F3;
  --surface: #F8F9FB;
  --sunk:    #E6E9ED;
  --ink:     #14181F;
  --ink-2:   #4A5260;
  --ink-3:   #737B88;
  --rule:    #CFD3DA;
  --rule-2:  #E1E4E9;
  --oxide:   #B23A1E;
  --oxide-w: rgba(178, 58, 30, 0.10);

  --pos:     #0F7355;
  --neg:     #A32B32;
  --warn:    #9A6707;
  --pos-w:   rgba(15, 115, 85, 0.10);
  --neg-w:   rgba(163, 43, 50, 0.10);

  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", "Roboto Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:   #0F1318;
    --surface: #161B21;
    --sunk:    #0A0D11;
    --ink:     #E4E7EC;
    --ink-2:   #98A0AC;
    --ink-3:   #6E7683;
    --rule:    #29303A;
    --rule-2:  #1F252D;
    --oxide:   #E1613F;
    --oxide-w: rgba(225, 97, 63, 0.13);

    --pos:     #4FBF92;
    --neg:     #E9636E;
    --warn:    #E0A63C;
    --pos-w:   rgba(79, 191, 146, 0.12);
    --neg-w:   rgba(233, 99, 110, 0.12);
  }
}

:root[data-theme="dark"] {
  --paper:   #0F1318;
  --surface: #161B21;
  --sunk:    #0A0D11;
  --ink:     #E4E7EC;
  --ink-2:   #98A0AC;
  --ink-3:   #6E7683;
  --rule:    #29303A;
  --rule-2:  #1F252D;
  --oxide:   #E1613F;
  --oxide-w: rgba(225, 97, 63, 0.13);
  --pos:     #4FBF92;
  --neg:     #E9636E;
  --warn:    #E0A63C;
  --pos-w:   rgba(79, 191, 146, 0.12);
  --neg-w:   rgba(233, 99, 110, 0.12);
}

:root[data-theme="light"] {
  --paper:   #EEF0F3;
  --surface: #F8F9FB;
  --sunk:    #E6E9ED;
  --ink:     #14181F;
  --ink-2:   #4A5260;
  --ink-3:   #737B88;
  --rule:    #CFD3DA;
  --rule-2:  #E1E4E9;
  --oxide:   #B23A1E;
  --oxide-w: rgba(178, 58, 30, 0.10);
  --pos:     #0F7355;
  --neg:     #A32B32;
  --warn:    #9A6707;
  --pos-w:   rgba(15, 115, 85, 0.10);
  --neg-w:   rgba(163, 43, 50, 0.10);
}

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

html { color-scheme: light dark; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--oxide); }

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

.wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 28px;
}

.wrap-narrow { max-width: 1160px; }

/* ---------- masthead + nav ---------- */

.masthead { border-bottom: 1px solid var(--rule); }

.masthead-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 22px 0 18px;
}

.mark {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.mark .alpha { color: var(--oxide); }

.label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.subnav {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  overflow-x: auto;
}

.subnav-inner {
  display: flex;
  gap: 2px;
  padding: 0;
  min-height: 40px;
  align-items: stretch;
}

.subnav a {
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 130ms ease, border-color 130ms ease, background 130ms ease;
}

.subnav a:hover { color: var(--oxide); background: var(--oxide-w); }

.subnav a.active {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--oxide);
}

/* ---------- page head ---------- */

main { padding: 32px 0 80px; }

h1 {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.035em;
  margin: 0 0 6px;
  text-wrap: balance;
}

h2 {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 34px 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ink);
}

h2:first-of-type { margin-top: 22px; }

.lede {
  color: var(--ink-2);
  font-size: 14.5px;
  max-width: 78ch;
  margin: 0 0 4px;
}

.note {
  color: var(--ink-3);
  font-size: 12.5px;
  max-width: 86ch;
  margin: 8px 0 0;
}

.note strong { color: var(--ink-2); }

.stamp {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
}

.stamp .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--pos); flex: none;
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  gap: 14px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin: 0 0 18px;
}

.field { display: flex; flex-direction: column; gap: 4px; }

.field > span {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

select, input[type="number"], input[type="text"], input[type="date"] {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 7px 9px;
  min-width: 120px;
  border-radius: 0;
}

select:hover, input:hover { border-color: var(--ink-3); }

.segmented {
  display: inline-flex;
  border: 1px solid var(--rule);
  background: var(--surface);
}

.segmented button {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--rule);
  padding: 7px 12px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.segmented button:last-child { border-right: 0; }
.segmented button:hover { background: var(--oxide-w); color: var(--oxide); }

.segmented button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

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

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin: 0 0 6px;
}

.card {
  background: var(--surface);
  padding: 12px 14px 13px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.card .k {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.card .v {
  font-family: var(--mono);
  font-size: 21px;
  font-weight: 650;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.card .v.sm { font-size: 15px; }

.card .sub {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

/* ---------- tables ---------- */

.tablewrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  background: var(--surface);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--sunk);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

thead th.num { text-align: right; }

thead th.sortable { cursor: pointer; user-select: none; }
thead th.sortable:hover { color: var(--oxide); }

thead th .caret { color: var(--oxide); }

tbody td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule-2);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

tbody td.num { text-align: right; font-family: var(--mono); }
tbody td.sym { font-family: var(--mono); font-weight: 650; letter-spacing: -0.01em; }
tbody td.wrap-cell { white-space: normal; min-width: 200px; }

tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: var(--oxide-w); }
tbody tr.is-selected td { background: var(--oxide-w); box-shadow: inset 2px 0 0 var(--oxide); }

/* ---------- semantics ---------- */

.pos  { color: var(--pos); }
.neg  { color: var(--neg); }
.warn { color: var(--warn); }
.dim  { color: var(--ink-3); }
.strong { font-weight: 650; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--rule);
  padding: 1px 7px;
  color: var(--ink-3);
}

.pill.ok   { color: var(--pos); border-color: var(--pos); background: var(--pos-w); }
.pill.bad  { color: var(--neg); border-color: var(--neg); background: var(--neg-w); }
.pill.mid  { color: var(--warn); border-color: var(--warn); }

/* ---------- charts ---------- */

.chartbox {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 14px;
  margin-top: 12px;
}

.chartbox canvas { display: block; width: 100%; }

/* ---------- calculator ---------- */

.calc {
  display: grid;
  grid-template-columns: minmax(300px, 400px) 1fr;
  gap: 28px;
  align-items: start;
}

@media (max-width: 860px) {
  .calc { grid-template-columns: 1fr; }
}

.calc-inputs {
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-row {
  display: grid;
  grid-template-columns: 1fr 118px;
  gap: 10px;
  align-items: center;
}

.calc-row label {
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.35;
}

.calc-row input, .calc-row select { min-width: 0; width: 100%; }

.calc-out {
  border: 1px solid var(--rule);
  background: var(--surface);
}

.calc-out table { font-size: 13px; }
.calc-out td { padding: 8px 14px; border-bottom: 1px solid var(--rule-2); }
.calc-out td.k { color: var(--ink-2); white-space: normal; }
.calc-out td.v {
  text-align: right;
  font-family: var(--mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.calc-out td.v.big { font-size: 18px; letter-spacing: -0.02em; }

/* ---------- empty / loading ---------- */

.empty {
  border: 1px dashed var(--rule);
  padding: 28px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--rule);
  padding: 22px 0 56px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

footer a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

footer a:hover { color: var(--oxide); border-color: var(--oxide); }

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}