/* Calculator form system — required/optional pattern, expandables,
   live preview sidebar, sticky action bar. Built on moss/Stripe DS palette. */

:root {
  --cf-bg: var(--canvas);
  --cf-card: #fff;
  --cf-surface-soft: #f5f7f9;
  --cf-ink: var(--ink);
  --cf-ink-soft: var(--ink-mute);
  --cf-ink-faint: #8a8580;
  --cf-border: var(--hairline);
  --cf-border-hover: #d4d6dc;
  --cf-required: #993333;
  --cf-good: #1d6e56;
  --cf-bad: #b22222;
  --cf-warn: #b3711f;
}

/* Layout */
.cf-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 160px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 32px;
  align-items: flex-start;
}
.cf-form-col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

/* Calc intro */
.cf-page-intro {
  max-width: 1280px;
  margin: 32px auto 24px;
  padding: 0 24px;
}
.cf-page-intro h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 44px;
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 12px 0 14px;
  color: var(--cf-ink);
}
.cf-page-intro h1 .accent { font-style: italic; color: var(--primary); }
.cf-page-intro .lead {
  font-size: 16px;
  color: var(--cf-ink-soft);
  max-width: 720px;
  line-height: 1.5;
  font-weight: 300;
}

/* Demo bar */
.cf-demo {
  background: color-mix(in srgb, var(--primary) 8%, white);
  border: 1px solid color-mix(in srgb, var(--primary) 25%, var(--cf-border));
  border-radius: 12px;
  padding: 18px 20px;
}
.cf-demo-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.cf-demo-title { font-family: var(--font-display); font-size: 18px; font-weight: 500; color: var(--cf-ink); }
.cf-demo-sub { font-size: 13px; color: var(--cf-ink-soft); margin-top: 4px; max-width: 540px; }

/* Section card — borderless, divider-separated */
.cf-section {
  background: transparent;
  border: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--cf-border);
  padding-bottom: 8px;
}
.cf-section:last-of-type { border-bottom: 0; }
.cf-section-head {
  display: flex; align-items: baseline; gap: 12px;
  padding: 24px 0 0;
}
.cf-ix { display: none; }
.cf-section-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--cf-ink);
  margin: 0;
}
.cf-section-tag {
  margin-left: auto;
  font-size: 11px;
  padding: 3px 10px;
  background: #f2f2f2;
  color: #8a8580;
  border-radius: 9999px;
  text-transform: lowercase;
  letter-spacing: 0.02em;
}
.cf-section-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 22px;
  padding: 16px 0 22px;
}

/* Field */
.cf-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.cf-field.span-2 { grid-column: 1 / -1; }
.cf-label { display: flex; align-items: center; gap: 8px; }
.cf-label-text { font-size: 13px; font-weight: 500; color: var(--cf-ink); }
.req-badge {
  font-size: 10px;
  font-weight: 600;
  color: var(--cf-required);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.opt-pill {
  font-size: 10px;
  font-weight: 500;
  color: #8a8580;
  background: #f2f2f2;
  padding: 2px 8px;
  border-radius: 9999px;
  letter-spacing: 0.01em;
}
.cf-hint {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 11px;
  color: var(--cf-ink-faint);
  line-height: 1.4;
}
.cf-hint.cf-err { color: var(--cf-required); font-style: normal; font-family: var(--font-sans); }

/* Inputs */
.cf-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  background: #fff;
  border: 1px solid var(--cf-border);
  border-radius: 8px;
  transition: border-color 140ms, box-shadow 140ms;
}
.cf-input-wrap:hover { border-color: var(--cf-border-hover); }
.cf-input-wrap:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent);
}
.cf-field.has-error .cf-input-wrap { border-color: var(--cf-required); }
.cf-input {
  border: 0; background: transparent; outline: none;
  width: 100%; height: 40px; padding: 0 12px;
  font: inherit; color: var(--cf-ink);
  font-variant-numeric: tabular-nums;
}
.cf-prefix, .cf-suffix {
  color: var(--cf-ink-faint);
  font-size: 13px;
  padding: 0 10px;
  user-select: none;
}
.cf-input-wrap.has-prefix .cf-input { padding-left: 0; }
.cf-input-wrap.has-suffix .cf-input { padding-right: 0; }
.cf-input::placeholder { color: var(--cf-ink-faint); }

/* Expandable */
.cf-expand-wrap { grid-column: 1 / -1; }
.cf-expand {
  background: var(--cf-surface-soft);
  border-radius: 10px;
  overflow: hidden;
  transition: background 160ms;
}
.cf-expand-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 16px;
  background: transparent;
  border: 0;
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  color: #4a4a4a;
  cursor: pointer;
  transition: color 140ms;
}
.cf-expand-head:hover { color: var(--cf-ink); }
.cf-expand-head svg { transition: transform 200ms; }
.cf-expand.open .cf-expand-head svg { transform: rotate(180deg); }
.cf-expand.open .cf-expand-head { color: var(--cf-ink); }
.cf-expand-body {
  border-top: 1px solid color-mix(in srgb, var(--cf-ink) 8%, transparent);
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 18px;
  animation: cf-fade-in 200ms ease;
}
@keyframes cf-fade-in { from { opacity: 0; } to { opacity: 1; } }
.cf-subtotal {
  grid-column: 1 / -1;
  text-align: right;
  font-size: 12px;
  color: var(--cf-ink-soft);
  padding-top: 8px;
  border-top: 1px dashed var(--cf-border);
}
.cf-subtotal b { color: var(--cf-ink); font-family: var(--font-display); font-weight: 500; }

/* Live sidebar */
.cf-sidebar { position: sticky; top: 88px; align-self: flex-start; }
.cf-sidebar-card {
  background: var(--cf-card);
  border: 1px solid var(--cf-border);
  border-radius: 12px;
  padding: 20px;
}
.cf-sb-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 10%, white);
  padding: 3px 10px;
  border-radius: 9999px;
}
.cf-sb-title { font-family: var(--font-display); font-size: 20px; font-weight: 500; color: var(--cf-ink); margin: 10px 0 4px; }
.cf-sb-sub { font-family: var(--font-display); font-style: italic; font-size: 12px; color: var(--cf-ink-faint); }
.cf-sb-rows { display: flex; flex-direction: column; gap: 0; margin: 20px 0 16px; }
.cf-sb-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--cf-border);
  font-size: 13px;
}
.cf-sb-row:last-child { border-bottom: 0; }
.cf-sb-label { color: var(--cf-ink-soft); }
.cf-sb-val { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 13px; color: var(--cf-ink-soft); font-variant-numeric: tabular-nums; }
.cf-sb-row.bottom { padding-top: 14px; margin-top: 6px; border-top: 1px solid var(--cf-border); border-bottom: 0; }
.cf-sb-row.bottom .cf-sb-label { font-weight: 500; color: var(--cf-ink); font-size: 14px; }
.cf-sb-row.bottom .cf-sb-val { font-size: 17px; color: var(--cf-ink); }
.cf-sb-row.good .cf-sb-val { color: var(--cf-good); }
.cf-sb-row.bad .cf-sb-val { color: var(--cf-bad); }
.cf-sb-row.warn .cf-sb-val { color: var(--cf-warn); }
.cf-sb-rows.tight .cf-sb-row { padding: 7px 0; font-size: 12px; }

/* Live preview — formula label under the headline row */
.cf-sb-formula {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10.5px;
  color: var(--cf-ink-faint);
  background: var(--cf-surface-soft);
  border-radius: 6px;
  padding: 7px 10px;
  margin: -8px 0 6px;
  text-align: center;
  letter-spacing: 0.01em;
}

/* Live preview — subsections (Leverage, ROI, Sensitivity) */
.cf-sb-subsection { margin-top: 18px; }
.cf-sb-subhead {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--cf-ink-faint);
  margin-bottom: 8px;
}
.cf-sb-pills { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cf-sb-pill {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--cf-surface-soft);
  border-left: 3px solid var(--cf-border);
}
.cf-sb-pill.good { border-left-color: var(--cf-good); }
.cf-sb-pill.warn { border-left-color: var(--cf-warn); }
.cf-sb-pill.bad { border-left-color: var(--cf-bad); }
.cf-sb-pill-label { font-size: 10.5px; color: var(--cf-ink-faint); }
.cf-sb-pill-val {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--cf-ink);
  font-variant-numeric: tabular-nums;
}
.cf-sb-pill.good .cf-sb-pill-val { color: var(--cf-good); }
.cf-sb-pill.warn .cf-sb-pill-val { color: var(--cf-warn); }
.cf-sb-pill.bad .cf-sb-pill-val { color: var(--cf-bad); }

/* Sensitivity table (4 cols: row-label + 3 ARV/reno cells) */
.cf-sb-sens {
  display: grid;
  grid-template-columns: minmax(0, 1fr) repeat(3, minmax(0, 1.05fr));
  gap: 1px;
  background: var(--cf-border);
  border: 1px solid var(--cf-border);
  border-radius: 6px;
  overflow: hidden;
}
.cf-sb-sens-cell {
  background: #fff;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10.5px;
  padding: 6px 5px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--cf-ink);
}
.cf-sb-sens-cell.head {
  background: var(--cf-surface-soft);
  font-family: var(--font-display);
  font-size: 9.5px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--cf-ink-faint);
  text-align: center;
}
.cf-sb-sens-cell.head.row { text-align: left; padding-left: 8px; }
.cf-sb-sens-cell.pos { color: var(--cf-good); }
.cf-sb-sens-cell.neg { color: var(--cf-bad); }

/* "Saved" indicator bar */
.cf-saved-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--cf-good) 6%, white);
  border: 1px solid color-mix(in srgb, var(--cf-good) 25%, var(--cf-border));
  font-size: 12px;
  color: var(--cf-ink-soft);
}
.cf-saved-dot {
  width: 7px; height: 7px; border-radius: 9999px;
  background: var(--cf-good);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cf-good) 18%, transparent);
}
.cf-saved-text { flex: 1; }
.cf-saved-clear {
  border: 0; background: transparent;
  font: inherit; font-size: 12px;
  color: var(--cf-good); cursor: pointer; padding: 4px 8px;
  border-radius: 6px;
  text-decoration: underline;
}
.cf-saved-clear:hover { background: color-mix(in srgb, var(--cf-good) 10%, transparent); }

.cf-sb-progress { margin-top: 16px; }
.cf-sb-progress-track { height: 4px; background: var(--cf-border); border-radius: 9999px; overflow: hidden; }
.cf-sb-progress-fill { height: 100%; background: var(--primary); border-radius: 9999px; transition: width 200ms; }
.cf-sb-progress-label { font-size: 11px; color: var(--cf-ink-faint); margin-top: 6px; font-family: var(--font-display); font-style: italic; }

/* Sticky action bar */
.cf-actionbar {
  position: fixed; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--cf-border);
  z-index: 50;
}
.cf-actionbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex; justify-content: space-between; align-items: center;
}
.cf-action-counter { font-family: var(--font-display); font-style: italic; font-size: 14px; color: var(--cf-ink-soft); }
.cf-counter-num { color: var(--cf-ink); font-weight: 500; font-style: normal; margin-right: 6px; }
.cf-action-buttons { display: flex; gap: 10px; align-items: center; }
.cf-btn-ghost {
  border: 1px solid var(--cf-border);
  background: transparent;
  font: inherit; font-size: 13px;
  padding: 8px 16px; border-radius: 9999px;
  cursor: pointer; color: var(--cf-ink-soft);
  transition: border-color 140ms, color 140ms;
}
.cf-btn-ghost:hover { color: var(--cf-ink); border-color: var(--cf-border-hover); }
.btn-primary-pill[disabled] { opacity: 0.4; cursor: not-allowed; }
.btn-primary-pill.ready { box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 20%, transparent); }

/* Toast */
.cf-toast {
  position: fixed;
  bottom: 80px; right: 24px;
  background: #1a1a1a; color: #fff;
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 6px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.18);
  opacity: 0; transform: translateY(8px);
  transition: opacity 200ms, transform 200ms;
  z-index: 60;
}
.cf-toast.show { opacity: 1; transform: translateY(0); }

/* Loan-input mode toggle (LTC % vs Dollar amount) */
.cf-toggle-row {
  display: inline-flex;
  border: 1px solid var(--cf-border);
  border-radius: 8px;
  overflow: hidden;
}
.cf-toggle-btn {
  background: transparent;
  border: none;
  font: inherit;
  font-size: 13px;
  color: var(--cf-ink-soft);
  padding: 7px 14px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}
.cf-toggle-btn + .cf-toggle-btn { border-left: 1px solid var(--cf-border); }
.cf-toggle-btn:hover { color: var(--cf-ink); }
.cf-toggle-btn.is-active {
  background: var(--primary);
  color: white;
}
.cf-warn-row {
  grid-column: 1 / -1;
  font-size: 12px;
  color: #8a5a00;
  background: #fff7e1;
  border: 1px solid #f0d27a;
  border-radius: 8px;
  padding: 8px 12px;
}
.cf-hint-row {
  grid-column: 1 / -1;
  font-size: 12px;
  color: var(--cf-ink-soft);
}
.cf-hint-row b { color: var(--cf-ink); font-family: var(--font-display); font-weight: 500; }

/* Responsive */
@media (max-width: 980px) {
  .cf-layout { grid-template-columns: 1fr; }
  .cf-sidebar { position: static; }
}
@media (max-width: 720px) {
  .cf-section-body { grid-template-columns: 1fr; }
  .cf-expand-body { grid-template-columns: 1fr; }
  .cf-demo-inner { flex-direction: column; align-items: flex-start; }
  .cf-actionbar-inner { padding: 10px 16px; }
  .cf-page-intro h1 { font-size: 32px; }
}