/*
 * Dark theme.
 *
 * Colours come from the validated data-viz reference palette rather than being
 * picked by eye: chart surface #1a1a19 on page plane #0d0d0d, series blue
 * #3987e5, and the fixed status set. Every foreground was checked for contrast
 * against the surface it actually sits on.
 */

:root {
  color-scheme: dark;

  /* Planes */
  --plane: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #212120;
  --surface-3: #2a2a28;

  /* Ink */
  --text: #ffffff;
  --text-2: #c3c2b7;
  --muted: #898781;

  /* Lines */
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --grid: #2c2c2a;
  --axis: #383835;

  /* Series & status. Status hues are reserved and never reused as a series. */
  --accent: #3987e5;          /* series line, focus ring, outlines */
  --accent-dim: rgba(57, 135, 229, 0.14);
  /* Solid button: white on #3987e5 is only 3.64:1, so the fill drops to blue
     ramp step 500, where white reads 5.39:1 and the button still sits 3.23:1
     clear of the surface. Hover darkens rather than lightens - no lighter step
     keeps white above 4.5:1. */
  --accent-solid: #256abf;
  --accent-solid-hover: #1c5cab;
  --pos: #0ca30c;             /* 5.19:1 on surface */
  --neg: #d03b3b;             /* reserved status fill; too dark for body text */
  --neg-text: #e66767;        /* 5.39:1 - the numerals use this */
  --warn: #fab219;

  --radius: 10px;
  --radius-sm: 6px;
  --ring: 0 0 0 3px rgba(57, 135, 229, 0.30);
}

* { box-sizing: border-box; }

html { background: var(--plane); }

body {
  margin: 0;
  padding: 0;
  font: 14px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--plane);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1440px;
  margin: 0 auto;
  padding: 26px 28px 80px;
}

/* ── Top bar ─────────────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 28px;
  height: 58px;
  background: rgba(13, 13, 13, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand .mark {
  width: 18px; height: 18px; border-radius: 5px; flex: none;
  background: linear-gradient(140deg, var(--accent), #7c4dd1);
}
.brand h1 {
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin: 0;
  white-space: nowrap;
}

/* Segmented tab control */
.tabs {
  display: flex;
  gap: 2px;
  padding: 3px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.tab {
  border: none;
  background: none;
  padding: 5px 14px;
  font: inherit;
  font-size: 13px;
  color: var(--text-2);
  cursor: pointer;
  border-radius: 6px;
  white-space: nowrap;
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab.active { color: var(--text); background: var(--surface-3); font-weight: 600; }
.tab:focus-visible { outline: none; box-shadow: var(--ring); }

.health {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--text-2);
  white-space: nowrap;
}
/* The dot is backed by the adjacent text, never the only signal. */
.health::before {
  content: "";
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--pos);
  flex: none;
}
.health.bad { color: var(--neg); }
.health.bad::before { background: var(--neg); }

/* Below this the three top-bar groups no longer fit on one line, so the tab
   control drops to its own full-width row rather than pushing the page sideways. */
@media (max-width: 720px) {
  .topbar {
    height: auto;
    flex-wrap: wrap;
    gap: 10px 16px;
    padding: 10px 16px;
  }
  .tabs { order: 3; width: 100%; }
  .tab { flex: 1; text-align: center; }
  .health { font-size: 11px; }
  .wrap { padding: 20px 16px 64px; }
  .controls { padding: 16px; }
  .controls button { margin-left: 0; width: 100%; }
  .controls input, .controls select { min-width: 0; width: 100%; }
  .controls label { flex: 1 1 140px; }
}

/* ── Cards ───────────────────────────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.panel { padding-top: 24px; }

.section-head { margin: 34px 0 12px; }
.section-head h2 {
  font-size: 14px;
  font-weight: 650;
  margin: 0;
  letter-spacing: -0.01em;
}
.section-head h2 small {
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
  margin-left: 8px;
  letter-spacing: 0;
}

/* ── Controls ────────────────────────────────────────────────────── */

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 16px;
  padding: 18px 20px;
}
.controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}
.controls label small {
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--muted);
}
.controls input,
.controls select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text);
  min-width: 150px;
}
.controls input:hover,
.controls select:hover { border-color: var(--border-strong); }
.controls input:focus,
.controls select:focus { outline: none; border-color: var(--accent); box-shadow: var(--ring); }

.with-unit { position: relative; display: inline-flex; align-items: center; }
.with-unit .unit {
  position: absolute; right: 10px;
  color: var(--muted); font-weight: 400;
  pointer-events: none;
}
.with-unit input { padding-right: 26px; }

.controls button {
  font: inherit;
  font-weight: 600;
  padding: 9px 20px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent-solid);
  color: #fff;
  cursor: pointer;
  margin-left: auto;
}
.controls button:hover { background: var(--accent-solid-hover); }
.controls button:focus-visible { outline: none; box-shadow: var(--ring); }
.controls button:disabled { opacity: .5; cursor: progress; }

/* A second controls row, visually subordinate to the first. */
.control-card { padding: 0; }
.controls-secondary {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  align-items: center;
}
.group-label {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  align-self: center;
}
.controls label.check {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 12.5px;
  font-weight: 400;
  color: var(--text-2);
  cursor: pointer;
}
.controls label.check input {
  min-width: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Error ───────────────────────────────────────────────────────── */

.error {
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid rgba(208, 59, 59, 0.40);
  border-left: 3px solid var(--neg);
  border-radius: var(--radius);
  background: rgba(208, 59, 59, 0.10);
  color: #f2b5b5;   /* 9.2:1 over the composited tint */
}
.error strong { color: #ff9c9c; }
.error pre {
  margin: 10px 0 0;
  font-size: 12px;
  white-space: pre-wrap;
  max-height: 180px;
  overflow: auto;
  color: var(--text-2);
}

.note {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-2);
  max-width: 80ch;
  margin: 0;
}
.note strong { color: var(--text); font-weight: 600; }

/* Long explainers collapse so they stop competing with the data. */
details.explain { margin: 10px 0 14px; }
details.explain > summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--muted);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 0;
}
details.explain > summary::-webkit-details-marker { display: none; }
details.explain > summary::before {
  content: "\25B8";
  font-size: 10px;
  transition: transform .15s ease;
}
details.explain[open] > summary::before { transform: rotate(90deg); }
details.explain > summary:hover { color: var(--text-2); }
details.explain .note { margin-top: 10px; }

/* Nothing-to-show state. Informational, not an error: the run succeeded, the
   instrument just is not listed that far out. */
.empty {
  margin: 22px 0 8px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--warn);
  border-radius: var(--radius);
  background: var(--surface);
}
.empty h3 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 650;
  color: var(--text);
}
.empty p { margin: 0; font-size: 12.5px; line-height: 1.65; color: var(--text-2); max-width: 78ch; }
.empty code {
  background: var(--surface-3);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

/* ── Summary tiles ───────────────────────────────────────────────── */

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 12px;
  margin-top: 4px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.stat .label {
  font-size: 10.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 600;
}
.stat .value {
  font-size: 21px;
  font-weight: 600;
  margin-top: 6px;
  letter-spacing: -0.02em;
}
.stat .sub { font-size: 11.5px; color: var(--muted); margin-top: 3px; }

/* The headline metric outranks the rest instead of sitting in a flat row. */
.stat.hero {
  grid-column: span 2;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border-color: var(--border-strong);
}
.stat.hero .value { font-size: 38px; margin-top: 4px; }
@media (max-width: 560px) { .stat.hero { grid-column: span 1; } }

.pos { color: var(--pos); }
.neg { color: var(--neg-text); }

/* ── Chart ───────────────────────────────────────────────────────── */

.chart-wrap {
  margin-top: 12px;
  padding: 18px 20px 20px;
  /* Chart.js sizes the canvas from its container, so without a ceiling here the
     two feed each other: a canvas left at its old width keeps the container wide,
     which keeps the canvas wide, and the page scrolls sideways on a narrow window. */
  max-width: 100%;
  overflow: hidden;
}
.chart-wrap canvas { max-width: 100%; }
/* maintainAspectRatio is off, so the canvas fills this box; give it a real height. */
.chart-canvas-box { position: relative; height: 300px; margin-top: 14px; }

/* ── Tables ──────────────────────────────────────────────────────── */

.table-wrap {
  max-width: 100%;
  overflow: auto;
  max-height: 580px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  font-variant-numeric: tabular-nums;
}
th, td {
  padding: 9px 14px;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}
th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface-2);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .06em;
  /* A shade lighter than --muted: these labels sit on --surface-2, where
     --muted would land at 4.49:1, just under AA for text this small. */
  color: #918f88;
  font-weight: 600;
}
th:first-child, td:first-child { text-align: left; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface-2); }

/* Unpriced months: no trade existed, so they must not read as break-even zeros. */
/* Recessive, but still legible: #6d6c67 measured 3.31:1, under AA. */
tr.unpriced td { color: #8a8984; background: rgba(255, 255, 255, 0.012); }
tr.unpriced:hover td { background: rgba(255, 255, 255, 0.035); }

.badge {
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 999px;
  font-weight: 600;
  display: inline-block;
}
.badge.held { background: rgba(12, 163, 12, 0.16); color: #5bd45b; }
.badge.breach { background: rgba(208, 59, 59, 0.16); color: #f07a7a; }
.badge.none { background: var(--surface-3); color: var(--muted); }

/* A cycle whose shares were called away. Backed by the word, not colour alone. */
.badge.assigned { background: rgba(250, 178, 25, 0.16); color: #f3c05a; }

/* A priced month whose sold strike never traded on the entry day: the premium is
   a settlement mark, so that row's P&L was never actually obtainable. The literal
   0 and the hover title carry it too; colour is never the only cue. */
.untraded { color: var(--warn); font-weight: 600; }

/* ── Diagnostics ─────────────────────────────────────────────────── */

.sub-head {
  font-size: 13px;
  font-weight: 650;
  margin: 0;
  letter-spacing: -0.01em;
}
.sub-head small {
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
  margin-left: 8px;
  letter-spacing: 0;
}

.diag-axis {
  display: flex;
  justify-content: space-between;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: 12px;
}
.diag-axis-mid { color: var(--text-2); }

.diag-row {
  display: grid;
  grid-template-columns: minmax(150px, 220px) 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 5px 0;
}
.diag-name { font-size: 12.5px; color: var(--text-2); }
.diag-value {
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  color: var(--text-2);
  min-width: 52px;
  text-align: right;
}

/* The track carries a centre line and, around it, the band inside which an
   effect counts as negligible. Drawing the threshold rather than naming it lets
   a null result be seen instead of worked out. */
.diag-track {
  position: relative;
  height: 20px;
  border-radius: 4px;
  background: var(--surface-2);
  overflow: hidden;
}
.diag-band {
  position: absolute;
  top: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.045);
  border-left: 1px dashed var(--border-strong);
  border-right: 1px dashed var(--border-strong);
}
.diag-mid {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--axis);
}
.diag-bar {
  position: absolute;
  top: 4px;
  bottom: 4px;
  border-radius: 3px;
  background: var(--accent);
}
/* An effect too small to mean anything is drawn muted, so the eye is not pulled
   to a bar that the statistics say to ignore. */
.diag-bar.negligible { background: var(--surface-3); }

/* Narrow: the label column starves the track, and the bar is the point. Stack so
   the track keeps the full width. */
@media (max-width: 720px) {
  .diag-row {
    grid-template-columns: 1fr auto;
    gap: 4px 10px;
    padding: 8px 0;
  }
  .diag-name { grid-column: 1 / -1; }
}

.diag-key {
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
  margin: 14px 0 0;
  max-width: 78ch;
}

.mag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
}
.mag.negligible { background: var(--surface-3); color: var(--muted); }
.mag.small { background: rgba(255,255,255,.07); color: var(--text-2); }
.mag.medium { background: rgba(250, 178, 25, 0.16); color: #f3c05a; }
.mag.large { background: rgba(57, 135, 229, 0.18); color: #7fb3f0; }

/* ── Heatmap ─────────────────────────────────────────────────────── */

.heatmap {
  display: grid;
  gap: 4px;
  width: max-content;
  max-width: 100%;
  margin-top: 4px;
}
.heat-cell {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
  min-width: 88px;
  cursor: default;
  color: #fff;
}
.heat-cell.header {
  background: none;
  color: var(--muted);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 600;
}
.heat-cell.best { outline: 2px solid var(--accent); outline-offset: 1px; }
/* Not a value on the scale: no contract could be opened, so it gets no fill. */
.heat-cell.none {
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 400;
  border: 1px dashed var(--border-strong);
}

/* Diverging legend: the fill hue is the encoding, so it gets a scale. */
.heat-legend {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.heat-legend .ramp {
  width: 190px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #be3838, var(--axis), #367cd1);
  border: 1px solid var(--border);
}

/* ── Scrollbars ──────────────────────────────────────────────────── */

* { scrollbar-color: var(--surface-3) transparent; scrollbar-width: thin; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--surface-3);
  border-radius: 999px;
  border: 2px solid var(--surface);
}
::-webkit-scrollbar-thumb:hover { background: #3a3a37; }