/* ====================================================================
   HandyConvert — Trades / Engineering surface  (v3, "pharma lab" look)
   Sky-blue accent palette on white. True 0px corners. Soft hairline
   borders (#E0F2FE / sky-100), with sky-blue (#0284C7) reserved for
   action / focus / result emphasis. Designed so each tool fits a
   single viewport on a typical 13"–15" laptop screen.
   ==================================================================== */

[data-category="trades"] {
  /* Surfaces (all white) */
  --bg:              #FFFFFF;
  --surface:         #FFFFFF;
  --surface-tint:    #F0F9FF;   /* sky-50 — subtle wash on result panel */

  /* Borders — soft sky-blue hairlines */
  --border:          #E0F2FE;   /* sky-100 */
  --border-mid:      #BAE6FD;   /* sky-200 */
  --border-strong:   #7DD3FC;   /* sky-300 */

  /* Text — near-black, slate gray */
  --text:            #0F172A;   /* slate-900 */
  --text-muted:      #475569;   /* slate-600 */
  --text-subtle:     #94A3B8;   /* slate-400 */

  /* Accent — sky-blue */
  --accent:          #0284C7;   /* sky-600 */
  --accent-strong:   #0369A1;   /* sky-700 */
  --accent-light:    #38BDF8;   /* sky-400 */
  --accent-soft:     #F0F9FF;   /* sky-50 */
  --on-accent:       #FFFFFF;

  /* Status */
  --ok:              #16A34A;
  --warn:            #EAB308;
  --danger:          #DC2626;

  /* Geometry — square, period */
  --radius:          0;
  --radius-sm:       0;
  --radius-md:       0;

  --shadow:          none;
  --font-mono:       'IBM Plex Mono', ui-monospace, SFMono-Regular,
                     'Menlo', 'Consolas', monospace;
}

/* ---- Page-level container ---------------------------------------- */
[data-category="trades"] main { padding: 0; }
[data-category="trades"] .container {
  max-width: 1100px;          /* wider so side-by-side fits well */
  padding-left: 20px;
  padding-right: 20px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- Page head — calm, lab-document tone ------------------------- */
[data-category="trades"] .page-head {
  padding: 20px 0 14px;
  margin: 0 0 16px;
  border-bottom: 1px solid var(--border);
}
[data-category="trades"] .page-head h1 {
  font: 500 22px/1.2 var(--font);
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0;
}
[data-category="trades"] .page-head .subhead {
  font: 400 13.5px/1.4 var(--font);
  color: var(--text-muted);
  margin: 4px 0 0;
}
[data-category="trades"] .page-head--compact { padding: 14px 0 10px; margin: 0 0 12px; }
[data-category="trades"] .page-head--compact h1 { font-size: 20px; }

/* ---- Headings on the page --------------------------------------- */
[data-category="trades"] h2 {
  font: 600 16px/1.2 var(--font);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 12px;
}
[data-category="trades"] h3 {
  font: 600 14px/1.3 var(--font);
  color: var(--text);
  margin: 12px 0 6px;
}
[data-category="trades"] section + section { margin-top: 24px; }

/* ====================================================================
   SECTION-LABEL CHIP
   A small kicker label (e.g. "INPUTS", "ANSWER") that sits at the
   top of a panel as a colored tab.
   ==================================================================== */
[data-category="trades"] .v3-label {
  display: inline-block;
  background: var(--accent);
  color: var(--on-accent);
  font: 600 10px/1 var(--font);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 5px 10px;
  margin: 0 0 12px;
}

/* ====================================================================
   THE TOOL — side-by-side INPUTS | ANSWER on desktop, stacked on mobile
   ==================================================================== */
[data-category="trades"] .v3-tool {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
}
@media (min-width: 760px) {
  [data-category="trades"] .v3-tool {
    grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.15fr);
    gap: 0;
    border: 1px solid var(--border);
  }
  [data-category="trades"] .v3-tool > .v3-panel + .v3-panel {
    border-left: 1px solid var(--border);
  }
}

[data-category="trades"] .v3-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 16px 18px 18px;
}
@media (min-width: 760px) {
  [data-category="trades"] .v3-panel { border: 0; }
}
[data-category="trades"] .v3-panel--answer {
  background: var(--surface-tint);   /* very pale sky wash */
}

/* ====================================================================
   INPUTS — labels above fields, vertical stacking inside the panel
   ==================================================================== */
[data-category="trades"] .v3-field { margin: 0 0 12px; }
[data-category="trades"] .v3-field:last-child { margin-bottom: 0; }

[data-category="trades"] .v3-field__label {
  display: block;
  font: 600 10px/1 var(--font);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 6px;
}
[data-category="trades"] .v3-field__hint {
  display: block;
  font: 400 12px/1.4 var(--font);
  color: var(--text-subtle);
  margin: 8px 0 0;
}

[data-category="trades"] .v3-input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-mid);
  border-radius: 0;
  font: 500 16px/1.4 var(--font-mono);
  font-variant-numeric: tabular-nums;
  transition: border-color 80ms ease;
}
[data-category="trades"] .v3-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

/* ---- Operator picker — joined row of 4 buttons -------------------- */
[data-category="trades"] .v3-ops {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-mid);
}
[data-category="trades"] .v3-op {
  appearance: none;
  background: var(--bg);
  border: 0;
  border-right: 1px solid var(--border-mid);
  height: 40px;
  font: 500 16px/1 var(--font-mono);
  color: var(--text-muted);
  cursor: pointer;
  transition: background 80ms ease, color 80ms ease;
}
[data-category="trades"] .v3-op:last-child { border-right: 0; }
[data-category="trades"] .v3-op:hover { color: var(--accent); background: var(--accent-soft); }
[data-category="trades"] .v3-op[aria-pressed="true"] {
  background: var(--accent);
  color: var(--on-accent);
}

/* ====================================================================
   ANSWER PANEL
   ==================================================================== */
[data-category="trades"] .v3-equation {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  padding: 14px 16px;
  font: 500 22px/1.2 var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
  margin: 0 0 10px;
}
[data-category="trades"] .v3-equation__op { color: var(--accent); }
[data-category="trades"] .v3-equation__eq { color: var(--text-subtle); }
[data-category="trades"] .v3-equation__r { color: var(--accent-strong); font-weight: 700; }

/* Detail readouts — three small panels in a row */
[data-category="trades"] .v3-readouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border);
  background: var(--bg);
  margin: 0 0 12px;
}
[data-category="trades"] .v3-readout {
  padding: 10px 12px;
  border-right: 1px solid var(--border);
}
[data-category="trades"] .v3-readout:last-child { border-right: 0; }
[data-category="trades"] .v3-readout__label {
  display: block;
  font: 600 9.5px/1 var(--font);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin: 0 0 4px;
}
[data-category="trades"] .v3-readout__value {
  display: block;
  font: 500 15px/1.2 var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
  margin: 0;
}

/* ---- Empty state when no result --------------------------------- */
[data-category="trades"] .v3-empty {
  background: var(--bg);
  border: 1px dashed var(--border-mid);
  padding: 24px 16px;
  text-align: center;
  font: 400 13px/1.4 var(--font);
  color: var(--text-subtle);
}

/* ====================================================================
   ACTIONS
   ==================================================================== */
[data-category="trades"] .v3-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
[data-category="trades"] .v3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--accent);
  color: var(--accent);
  height: 34px;
  padding: 0 14px;
  font: 600 12px/1 var(--font);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 80ms ease, color 80ms ease;
}
[data-category="trades"] .v3-btn:hover {
  background: var(--accent);
  color: var(--on-accent);
}
[data-category="trades"] .v3-btn--primary {
  background: var(--accent);
  color: var(--on-accent);
}
[data-category="trades"] .v3-btn--primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

/* ====================================================================
   HOW-TO DISCLOSURE — collapsed by default, slim
   ==================================================================== */
[data-category="trades"] details.v3-help {
  border: 1px solid var(--border);
  background: var(--bg);
  margin: 0 0 14px;
}
[data-category="trades"] details.v3-help > summary {
  list-style: none;
  cursor: pointer;
  padding: 8px 14px;
  font: 600 10.5px/1 var(--font);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
[data-category="trades"] details.v3-help > summary::-webkit-details-marker { display: none; }
[data-category="trades"] details.v3-help > summary:hover { color: var(--accent); }
[data-category="trades"] details.v3-help[open] > summary {
  border-bottom: 1px solid var(--border);
  background: var(--surface-tint);
  color: var(--accent);
}
[data-category="trades"] details.v3-help .v3-help__caret {
  font-family: var(--font-mono);
  font-size: 11px;
  transition: transform 150ms ease;
}
[data-category="trades"] details.v3-help[open] .v3-help__caret { transform: rotate(180deg); }
[data-category="trades"] details.v3-help .v3-help__body { padding: 12px 14px 14px; }
[data-category="trades"] details.v3-help p {
  margin: 0 0 8px;
  font: 400 13.5px/1.55 var(--font);
  color: var(--text-muted);
}
[data-category="trades"] details.v3-help ol {
  margin: 0;
  padding-left: 22px;
  font: 400 13.5px/1.6 var(--font);
  color: var(--text-muted);
}
[data-category="trades"] details.v3-help li { padding: 3px 0; }
[data-category="trades"] details.v3-help strong { color: var(--text); font-weight: 600; }

/* ====================================================================
   PROSE (below-fold sections)
   ==================================================================== */
[data-category="trades"] .v3-prose {
  max-width: 720px;
  margin: 32px 0 0;
}
[data-category="trades"] .v3-prose p,
[data-category="trades"] .v3-prose li {
  font: 400 14.5px/1.7 var(--font);
  color: var(--text-muted);
  margin: 0 0 10px;
}

[data-category="trades"] .v3-stamp {
  display: inline-block;
  font: 500 11px/1.4 var(--font-mono);
  color: var(--text-subtle);
  margin: 6px 0 0;
}

/* ====================================================================
   REFERENCE TABLE
   ==================================================================== */
[data-category="trades"] .v3-ref-wrap { overflow-x: auto; margin: 0 0 12px; }
[data-category="trades"] .v3-ref {
  width: 100%;
  border-collapse: collapse;
  font: 500 13.5px/1.4 var(--font-mono);
  font-variant-numeric: tabular-nums;
}
[data-category="trades"] .v3-ref th,
[data-category="trades"] .v3-ref td {
  padding: 6px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border);
}
[data-category="trades"] .v3-ref th {
  font-weight: 600;
  color: var(--text-subtle);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--border-mid);
}
[data-category="trades"] .v3-ref th:first-child,
[data-category="trades"] .v3-ref td:first-child { text-align: left; }

/* ====================================================================
   FAQ — light hairline rule between questions
   ==================================================================== */
[data-category="trades"] details.v3-q {
  border-top: 1px solid var(--border);
  padding: 10px 0;
}
[data-category="trades"] details.v3-q:last-of-type { border-bottom: 1px solid var(--border); }
[data-category="trades"] details.v3-q > summary {
  cursor: pointer;
  font: 500 14.5px/1.3 var(--font);
  list-style: none;
  padding: 4px 24px 4px 0;
  position: relative;
  color: var(--text);
}
[data-category="trades"] details.v3-q > summary::-webkit-details-marker { display: none; }
[data-category="trades"] details.v3-q > summary::after {
  content: "+";
  position: absolute;
  right: 0; top: 4px;
  font-family: var(--font-mono);
  color: var(--accent);
}
[data-category="trades"] details.v3-q[open] > summary::after { content: "−"; }
[data-category="trades"] details.v3-q > div p {
  padding: 6px 0 4px;
  font: 400 14px/1.6 var(--font);
  color: var(--text-muted);
}

/* ====================================================================
   TOAST
   ==================================================================== */
[data-category="trades"] .v3-toast {
  position: fixed;
  left: 50%; bottom: 24px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  font: 500 13px/1 var(--font);
  z-index: 1000;
}