/* ═══════════════════════════════════════════
   44 · COMPONENT: CALCULATOR & FORMS KIT
   Extends §21 form controls with the pieces
   interactive tools need: affixed numeric
   inputs, steppers, ranges, segmented
   controls, results panels, breakdowns,
   assumptions, disclaimers, tool shell.
   Consumes digit-2026.css tokens only —
   load AFTER digit-2026.css. No new roots.
═══════════════════════════════════════════ */

/* ── Tool shell: inputs left, live result right ── */
.calc-shell {
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(300px,420px);
  gap:2rem;
  align-items:start;
}
.calc-shell-result { position:sticky;top:calc(var(--sp-element) + 72px); }
@media (max-width:860px) {
  /* minmax(0,1fr), not 1fr: a bare 1fr keeps min-width:auto, so wide intrinsic
     content (segmented controls, selects) stretches the column past the viewport */
  .calc-shell { grid-template-columns:minmax(0,1fr); }
  .calc-shell-result { position:static; }
}

/* ── Panels ── */
.calc-card {
  background:#fff;
  border:1px solid var(--blue-lt);
  border-radius:var(--r-card);
  padding:2rem;
}
.calc-card + .calc-card { margin-top:var(--sp-element); }
.calc-card-title {
  font-family:'Fraunces',serif;
  font-size:var(--fs-h3);color:var(--dark);
  margin:0 0 .35rem;
}
.calc-card-sub {
  font-size:var(--fs-xs);color:var(--muted);
  margin:0 0 1.5rem;line-height:1.5;
}

/* ── Fieldset rows ── */
.calc-fields { display:flex;flex-direction:column;gap:1.25rem; }
.calc-row { display:grid;grid-template-columns:1fr 1fr;gap:1rem; }
@media (max-width:560px) { .calc-row { grid-template-columns:1fr; } }
.calc-fieldset { border:none;margin:0;padding:0;min-width:0; }
.calc-legend {
  font-size:var(--fs-label);letter-spacing:.08em;text-transform:uppercase;
  color:var(--cool-grey);font-weight:700;
  padding:0;margin-bottom:.85rem;
}

/* ── Label + help tooltip ── */
.calc-label-row {
  display:flex;align-items:center;gap:.4rem;
  margin-bottom:.4rem;
}
.calc-label-row .form-label { margin-bottom:0; }
.calc-help {
  width:17px;height:17px;flex-shrink:0;
  border:none;border-radius:50%;
  background:var(--blue-lt);color:var(--cool-grey);
  font-size:var(--fs-micro);font-weight:700;line-height:1;
  display:grid;place-items:center;
  cursor:help;position:relative;
  transition:background .15s,color .15s;
}
.calc-help:hover,
.calc-help:focus-visible { background:var(--cyan);color:#fff;outline:none; }
.calc-help[data-tip]::after {
  content:attr(data-tip);
  position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(4px);
  width:max-content;max-width:240px;
  background:var(--dark);color:#fff;
  font-size:var(--fs-micro);font-weight:400;line-height:1.45;text-align:left;
  padding:.5rem .7rem;border-radius:6px;
  display:none;opacity:0;pointer-events:none;
  transition:opacity .15s,transform .15s;
  z-index:20;
}
/* display:none while hidden - an opacity-0 absolute tooltip still occupies layout,
   which widens document scrollWidth on small screens when the button sits near an edge */
.calc-help:hover::after,
.calc-help:focus-visible::after { display:block;opacity:1;transform:translateX(-50%) translateY(0); }

/* ── Affixed input: $ 1,200 /week ── */
.input-group {
  display:flex;align-items:stretch;
  border:1px solid var(--silver);
  border-radius:var(--r-button);
  background:#fff;
  transition:border-color .2s,box-shadow .2s;
  overflow:hidden;
}
.input-group:hover { border-color:var(--cool-grey); }
.input-group:focus-within {
  border-color:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,174,202,.15);
}
.input-group .form-input {
  border:none;border-radius:0;box-shadow:none;
  min-height:50px;flex:1;min-width:0;
  font-variant-numeric:tabular-nums;
}
.input-group .form-input:focus { box-shadow:none; }
.input-affix {
  display:flex;align-items:center;
  padding:0 .9rem;
  background:var(--blue-xlt);
  color:var(--cool-grey);
  font-size:var(--fs-small);font-weight:700;
  white-space:nowrap;
  user-select:none;
}
.input-affix:first-child { border-right:1px solid var(--blue-lt); }
.input-affix:last-child { border-left:1px solid var(--blue-lt); }
/* error variant mirrors .form-input-error */
.input-group-error { border-color:var(--terracotta); }
.input-group-error:focus-within {
  border-color:var(--terracotta);
  box-shadow:0 0 0 3px rgba(184,114,90,.15);
}

/* ── Stepper: − [ 38 ] + ── */
.calc-stepper { display:flex;align-items:stretch;gap:.5rem; }
.calc-stepper .input-group { flex:1; }
.calc-stepper .form-input { text-align:center; }
.calc-stepper-btn {
  width:50px;flex-shrink:0;
  border:1px solid var(--silver);
  border-radius:var(--r-button);
  background:#fff;color:var(--dark);
  font-size:1.1rem;font-weight:700;line-height:1;
  cursor:pointer;
  display:grid;place-items:center;
  transition:background .15s,border-color .15s,color .15s;
}
.calc-stepper-btn:hover { border-color:var(--cyan);color:var(--cyan-d); }
.calc-stepper-btn:focus-visible {
  outline:none;border-color:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,174,202,.15);
}
.calc-stepper-btn:active { background:var(--cyan-p); }
.calc-stepper-btn:disabled { opacity:.35;cursor:default;pointer-events:none; }

/* ── Range slider with filled track ──
   JS sets --fill: percentage, e.g. style="--fill:64%" */
.calc-range { display:block; }
.calc-range-head {
  display:flex;justify-content:space-between;align-items:baseline;
  margin-bottom:.55rem;
}
.calc-range-value {
  font-family:'Fraunces',serif;
  font-size:1.25rem;color:var(--dark);
  font-variant-numeric:tabular-nums;
}
.calc-range input[type="range"] {
  -webkit-appearance:none;appearance:none;
  width:100%;height:6px;border-radius:3px;
  background:linear-gradient(to right,var(--cyan) var(--fill,50%),var(--blue-lt) var(--fill,50%));
  outline:none;cursor:pointer;
}
.calc-range input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance:none;appearance:none;
  width:22px;height:22px;border-radius:50%;
  background:#fff;border:2px solid var(--cyan);
  box-shadow:0 1px 3px rgba(0,0,0,.15);
  transition:transform .15s;
}
.calc-range input[type="range"]::-moz-range-thumb {
  width:22px;height:22px;border-radius:50%;
  background:#fff;border:2px solid var(--cyan);
  box-shadow:0 1px 3px rgba(0,0,0,.15);
  transition:transform .15s;
}
.calc-range input[type="range"]:hover::-webkit-slider-thumb,
.calc-range input[type="range"]:focus-visible::-webkit-slider-thumb { transform:scale(1.15); }
.calc-range input[type="range"]:focus-visible {
  box-shadow:0 0 0 3px rgba(0,174,202,.15);
}
.calc-range-scale {
  display:flex;justify-content:space-between;
  font-size:var(--fs-micro);color:var(--cool-grey);
  margin-top:.4rem;font-variant-numeric:tabular-nums;
}

/* ── Segmented control: Weekly | Fortnightly | Monthly ── */
.calc-seg {
  display:inline-flex;
  background:var(--blue-xlt);
  border:1px solid var(--blue-lt);
  border-radius:var(--r-button);
  padding:3px;gap:2px;
  max-width:100%;overflow-x:auto;
}
.calc-seg-btn { position:relative;display:inline-flex; }
.calc-seg-btn input {
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0,0,0,0);border:0;white-space:nowrap;
}
.calc-seg-btn span {
  display:inline-flex;align-items:center;
  padding:.5rem 1rem;
  border-radius:calc(var(--r-button) - 3px);
  font-size:var(--fs-xs);font-weight:700;color:var(--muted);
  cursor:pointer;white-space:nowrap;
  transition:background .15s,color .15s,box-shadow .15s;
}
.calc-seg-btn:hover span { color:var(--dark); }
.calc-seg-btn input:checked + span {
  background:#fff;color:var(--dark);
  box-shadow:0 1px 3px rgba(12,28,46,.12);
}
.calc-seg-btn input:focus-visible + span {
  box-shadow:0 0 0 3px rgba(0,174,202,.25);
}

/* ── Result panel (dark, live) ── */
.calc-result {
  background:var(--dark);
  border-radius:var(--r-card);
  padding:2rem;
  color:#fff;
}
.calc-result-label {
  font-size:var(--fs-label);letter-spacing:.08em;text-transform:uppercase;
  color:var(--silver);font-weight:700;
  margin:0 0 .5rem;
}
.calc-result-figure {
  font-family:'Fraunces',serif;
  font-size:clamp(2.2rem,4vw,3rem);line-height:1.05;
  color:#fff;margin:0;
  font-variant-numeric:tabular-nums;
  transition:opacity .2s;
}
.calc-result-figure small {
  font-family:'DM Sans',sans-serif;
  font-size:var(--fs-small);color:var(--silver);font-weight:400;
  margin-left:.35rem;
}
.calc-result-note {
  font-size:var(--fs-xs);color:var(--cool-grey);
  margin:.6rem 0 0;line-height:1.5;
}
.calc-result.is-recalc .calc-result-figure { opacity:.35; }
/* secondary figures row */
.calc-result-secondary {
  display:grid;grid-template-columns:1fr 1fr;gap:1rem;
  margin-top:1.5rem;padding-top:1.5rem;
  border-top:1px solid var(--blue-mid);
}
.calc-result-secondary b {
  display:block;font-size:1.15rem;color:#fff;
  font-variant-numeric:tabular-nums;
}
.calc-result-secondary span {
  font-size:var(--fs-micro);color:var(--silver);
}

/* ── Breakdown table ── */
.calc-breakdown { width:100%;border-collapse:collapse;margin-top:1.5rem; }
.calc-breakdown th {
  font-size:var(--fs-label);letter-spacing:.06em;text-transform:uppercase;
  color:var(--cool-grey);font-weight:700;text-align:left;
  padding:.45rem 0;border-bottom:1px solid var(--blue-lt);
}
.calc-breakdown th:last-child { text-align:right; }
.calc-breakdown td {
  font-size:var(--fs-small);color:var(--text);
  padding:.55rem 0;border-bottom:1px solid var(--blue-xlt);
  line-height:1.4;
}
.calc-breakdown td:last-child {
  text-align:right;font-variant-numeric:tabular-nums;
  white-space:nowrap;color:var(--dark);
}
.calc-breakdown .is-subtle td { color:var(--muted); }
.calc-breakdown .is-total td {
  border-bottom:none;border-top:2px solid var(--dark);
  font-weight:700;color:var(--dark);
  padding-top:.75rem;
}
/* dark variant inside .calc-result */
.calc-result .calc-breakdown th { color:var(--cool-grey);border-color:var(--blue-mid); }
.calc-result .calc-breakdown td { color:var(--blue-lt);border-color:var(--blue-mid); }
.calc-result .calc-breakdown td:last-child { color:#fff; }
.calc-result .calc-breakdown .is-total td { border-top-color:var(--cyan);color:#fff; }
/* the last-column nowrap above exists for currency figures; on narrow screens it
   forces prose cells (e.g. a method description) wider than the viewport. Placed
   AFTER the base rule - same specificity, so source order decides the cascade. */
@media (max-width:860px) {
  .calc-breakdown td:last-child { white-space:normal; }
}

/* ── Assumptions (collapsible) ── */
.calc-assumptions {
  margin-top:var(--sp-element);
  border:1px solid var(--blue-lt);
  border-radius:var(--r-btn);
  background:var(--blue-xlt);
}
.calc-assumptions summary {
  font-size:var(--fs-xs);font-weight:700;color:var(--muted);
  padding:.8rem 1rem;cursor:pointer;list-style:none;
  display:flex;align-items:center;gap:.5rem;
}
.calc-assumptions summary::-webkit-details-marker { display:none; }
.calc-assumptions summary::before {
  content:'';width:0;height:0;
  border-left:5px solid var(--cool-grey);
  border-top:4px solid transparent;border-bottom:4px solid transparent;
  transition:transform .15s;
}
.calc-assumptions[open] summary::before { transform:rotate(90deg); }
.calc-assumptions ul {
  margin:0;padding:0 1rem 1rem 2.1rem;
  font-size:var(--fs-xs);color:var(--muted);line-height:1.6;
}
.calc-assumptions li { margin:.25rem 0; }
.calc-assumptions li b { color:var(--text);font-weight:700; }

/* ── Disclaimer (general advice / TPB) ── */
.calc-disclaimer {
  margin-top:var(--sp-element);
  padding:1rem 1.25rem;
  background:var(--oatmeal);
  border-left:3px solid var(--terracotta);
  border-radius:0 var(--r-btn) var(--r-btn) 0;
  font-size:var(--fs-xs);color:var(--muted);line-height:1.6;
}
.calc-disclaimer b { color:var(--text); }

/* ── Action row ── */
.calc-actions {
  display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;
  margin-top:1.5rem;
}
.calc-actions .btn-primary,
.calc-actions .btn-secondary { min-height:44px; }

/* ── Multi-step progress (health-check style tools) ── */
.calc-steps {
  display:flex;gap:.4rem;
  margin-bottom:var(--sp-block);
}
.calc-step {
  flex:1;height:4px;border-radius:2px;
  background:var(--blue-lt);
  position:relative;
}
.calc-step.is-done { background:var(--cyan); }
.calc-step.is-active { background:var(--cyan);opacity:.45; }
.calc-steps-label {
  font-size:var(--fs-xs);color:var(--muted);
  margin:-1.4rem 0 var(--sp-block);
  font-variant-numeric:tabular-nums;
}

/* ── Reduced motion + print ── */
@media (prefers-reduced-motion:reduce) {
  .calc-help[data-tip]::after,
  .calc-range input[type="range"]::-webkit-slider-thumb,
  .calc-seg-btn span,
  .calc-result-figure { transition:none; }
}
@media print {
  .calc-shell { grid-template-columns:1fr; }
  .calc-actions,.calc-help { display:none; }
  .calc-result { border:1px solid #999;color:#000;background:#fff; }
  .calc-result-figure,.calc-result .calc-breakdown td:last-child { color:#000; }
  .calc-assumptions[open] { background:#fff; }
}