.bf-calculator {
  --bf-ink: #172033;
  --bf-muted: #5c667a;
  --bf-line: #d7deea;
  --bf-soft: #f4f7fb;
  --bf-blue: #0969da;
  --bf-blue-dark: #0550ae;
  --bf-coral: #cf3f52;
  --bf-warning: #fff7d6;
  color: var(--bf-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.55;
}

.bf-intro {
  max-width: 52rem;
  margin-bottom: 1.5rem;
  color: var(--bf-muted);
  font-size: 1.05rem;
}

.bf-notice {
  margin: 0 0 1.5rem;
  padding: 0.85rem 1rem;
  border-left: 4px solid #d4a72c;
  border-radius: 0 6px 6px 0;
  background: #fffbea;
  color: #4f431d;
}

.bf-workspace {
  display: grid;
  grid-template-columns: minmax(18rem, 0.92fr) minmax(22rem, 1.08fr);
  gap: 1.5rem;
  align-items: start;
}

.bf-workspace:has(.bf-result-card[hidden]) {
  grid-template-columns: minmax(18rem, 36rem);
}

.bf-card {
  border: 1px solid var(--bf-line);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(31, 42, 68, 0.06);
}

.bf-input-card {
  padding: 1.25rem;
}

.bf-section-heading {
  margin: 0 0 0.35rem !important;
  padding: 0 !important;
  border: 0 !important;
  font-size: 1.15rem !important;
}

.bf-section-note {
  margin: 0 0 1rem;
  color: var(--bf-muted);
  font-size: 0.9rem;
}

.bf-unit-toggle {
  display: inline-flex;
  margin-bottom: 1.1rem;
  padding: 3px;
  border: 1px solid var(--bf-line);
  border-radius: 9px;
  background: var(--bf-soft);
}

.bf-unit-toggle label {
  position: relative;
  margin: 0;
  cursor: pointer;
}

.bf-unit-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.bf-unit-toggle span {
  display: block;
  padding: 0.42rem 0.8rem;
  border-radius: 6px;
  color: var(--bf-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.bf-unit-toggle input:checked + span {
  background: #fff;
  color: var(--bf-blue-dark);
  box-shadow: 0 1px 4px rgba(31, 42, 68, 0.14);
}

.bf-unit-toggle input:focus-visible + span {
  outline: 3px solid rgba(9, 105, 218, 0.28);
  outline-offset: 2px;
}

.bf-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.bf-field {
  min-width: 0;
}

.bf-field label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.3rem;
  color: var(--bf-ink);
  font-size: 0.875rem;
  font-weight: 600;
}

.bf-input-wrap {
  display: flex;
  overflow: hidden;
  border: 1px solid #b8c1d1;
  border-radius: 7px;
  background: #fff;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.bf-input-wrap:focus-within {
  border-color: var(--bf-blue);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.16);
}

.bf-input-wrap input {
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0.58rem 0.65rem;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
  color: var(--bf-ink);
  font-size: 1rem;
}

.bf-input-wrap input:focus {
  outline: 0;
  box-shadow: none;
}

.bf-unit {
  display: flex;
  min-width: 2.65rem;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--bf-line);
  background: var(--bf-soft);
  color: var(--bf-muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.bf-distance-warning {
  margin: 1.4rem 0 0;
  padding: 0.65rem 0.75rem;
  border: 1px solid #ead38c;
  border-radius: 7px;
  background: var(--bf-warning);
  color: #8a5b00;
  font-size: 0.86rem;
  line-height: 1.4;
}

.bf-distance-warning p {
  margin: 0;
}

.bf-distance-warning p + p {
  margin-top: 0.55rem;
}

.bf-distance-warning ul {
  margin: 0.35rem 0 0 1.25rem;
}

.bf-distance-warning li + li {
  margin-top: 0.18rem;
}

.bf-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.2rem;
}

.bf-button {
  min-height: 2.65rem;
  padding: 0.58rem 1rem;
  border: 1px solid transparent;
  border-radius: 7px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

.bf-button-primary {
  background: var(--bf-blue);
  color: #fff;
}

.bf-button-primary:hover:not(:disabled) {
  background: var(--bf-blue-dark);
}

.bf-button-primary:disabled {
  opacity: 0.58;
  cursor: wait;
}

.bf-button-secondary {
  border-color: var(--bf-line);
  background: #fff;
  color: var(--bf-muted);
}

.bf-button:focus-visible {
  outline: 3px solid rgba(9, 105, 218, 0.28);
  outline-offset: 2px;
}

.bf-status {
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
  color: var(--bf-muted);
  font-size: 0.86rem;
}

.bf-status.is-error {
  color: #b42318;
}

.bf-result-card {
  overflow: hidden;
}

.bf-result-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bf-line);
  border-bottom: 1px solid var(--bf-line);
}

.bf-result-stat {
  padding: 1.25rem;
  background: #fff;
}

.bf-result-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--bf-muted);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.bf-result-value {
  display: block;
  color: var(--bf-ink);
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.bf-result-detail {
  display: block;
  margin-top: 0.38rem;
  color: var(--bf-muted);
  font-size: 0.82rem;
}

.bf-result-meta {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--bf-line);
  color: var(--bf-muted);
  font-size: 0.84rem;
}

.bf-result-meta span + span::before {
  content: " · ";
}

.bf-chart-wrap {
  padding: 0.75rem 1rem 1rem;
}

.bf-chart-title {
  margin: 0.25rem 0 0 !important;
  font-size: 1rem !important;
}

.bf-chart-subtitle {
  margin: 0.15rem 0 0.4rem;
  color: var(--bf-muted);
  font-size: 0.8rem;
}

.bf-chart {
  display: block;
  width: 100%;
  min-height: 15rem;
}

.bf-chart-bar {
  fill: #82aadd;
  opacity: 0.78;
}

.bf-chart-grid {
  stroke: #e7ebf2;
  stroke-width: 1;
}

.bf-chart-axis {
  stroke: #8c96a8;
  stroke-width: 1;
}

.bf-chart-tick,
.bf-chart-axis-label {
  fill: var(--bf-muted);
  font-family: inherit;
  font-size: 13px;
}

.bf-chart-band {
  fill: var(--bf-coral);
  opacity: 0.16;
}

.bf-chart-sd-line {
  stroke: var(--bf-coral);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  opacity: 0.8;
}

.bf-chart-mean-line {
  stroke: #9d2438;
  stroke-width: 3;
}

.bf-chart-mean-label {
  fill: #9d2438;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
}

.bf-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: -0.15rem 0 0.2rem 0.2rem;
  color: var(--bf-muted);
  font-size: 0.8rem;
}

.bf-key {
  display: inline-block;
  width: 1rem;
  height: 0.65rem;
  margin-right: 0.3rem;
  vertical-align: -0.04rem;
}

.bf-key-histogram {
  background: #82aadd;
}

.bf-key-band {
  border-left: 2px solid #9d2438;
  background: rgba(207, 63, 82, 0.2);
}

.bf-warning-box {
  margin: 0 1rem 1rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid #ead38c;
  border-radius: 7px;
  background: var(--bf-warning);
  color: #5b4610;
  font-size: 0.86rem;
}

.bf-warning-box ul {
  margin: 0.35rem 0 0 1.1rem;
}

.bf-warning-box li + li {
  margin-top: 0.2rem;
}

.bf-method {
  margin-top: 2.5rem;
}

.bf-method h2 {
  margin-top: 2rem;
}

.bf-class-weights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.25rem;
}

.bf-class-pill {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--bf-line);
  border-radius: 999px;
  background: var(--bf-soft);
  color: var(--bf-muted);
  font-size: 0.86rem;
}

.bf-table-scroll {
  overflow-x: auto;
  margin: 0.75rem 0 1.75rem;
  border: 1px solid var(--bf-line);
  border-radius: 9px;
}

.bf-table-scroll table {
  display: table !important;
  width: 100%;
  min-width: 38rem;
  max-width: none !important;
  margin: 0 !important;
  border: 0 !important;
  border-collapse: collapse;
  overflow: visible !important;
}

.bf-table-scroll th {
  white-space: nowrap;
  background: var(--bf-soft);
}

.bf-table-scroll td,
.bf-table-scroll th {
  padding: 0.55rem 0.7rem !important;
}

.bf-table-scroll td:not(:first-child),
.bf-table-scroll th:not(:first-child) {
  text-align: right;
}

.bf-table-scroll .bf-pip-above-prior td:nth-child(2) {
  background: #e8f2ff;
  color: #0550ae;
  font-weight: 700;
}

.bf-footnote {
  color: var(--bf-muted);
  font-size: 0.88rem;
}

.bf-pip-key {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0.8rem 0 1.25rem;
  color: var(--bf-muted);
  font-size: 0.88rem;
}

.bf-pip-key span {
  display: inline-block;
  flex: 0 0 auto;
  width: 0.85rem;
  height: 0.85rem;
  border: 1px solid #b6d4fe;
  border-radius: 3px;
  background: #e8f2ff;
}

@media (max-width: 800px) {
  .bf-workspace {
    grid-template-columns: 1fr;
  }

  .bf-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .bf-fields,
  .bf-result-summary {
    grid-template-columns: 1fr;
  }

  .bf-result-summary {
    gap: 0;
  }

  .bf-result-stat + .bf-result-stat {
    border-top: 1px solid var(--bf-line);
  }

  .bf-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .bf-button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bf-input-wrap {
    transition: none;
  }
}