/*
 * Gravel Calculators. Works under any theme; the gravel-calculator theme can override the
 * --gcalc-* custom properties. Colours meet WCAG 2.2 AA contrast (4.5:1 text, 3:1 UI).
 */

.gcalc {
  --gcalc-bg: #ffffff;
  --gcalc-surface: #f6f4f0;
  --gcalc-border: #8a8378;
  --gcalc-text: #23201c;
  --gcalc-muted: #5b554c;
  --gcalc-accent: #4d5b2e;
  --gcalc-accent-text: #ffffff;
  --gcalc-error: #a3221b;
  --gcalc-focus: #1f5fbf;
  --gcalc-radius: 8px;

  box-sizing: border-box;
  max-width: 48rem;
  margin: 1.5rem 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--gcalc-border);
  border-radius: var(--gcalc-radius);
  background: var(--gcalc-bg);
  color: var(--gcalc-text);
  font-size: 1rem;
  line-height: 1.5;
}

.gcalc *,
.gcalc *::before,
.gcalc *::after {
  box-sizing: inherit;
}

.gcalc [hidden] {
  display: none !important;
}

.gcalc-title {
  margin: 0 0 1rem;
  font-size: 1.375rem;
  line-height: 1.3;
}

.gcalc-form {
  display: grid;
  gap: 1rem;
}

.gcalc-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  align-items: start;
}

.gcalc-field {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
}

.gcalc-field > label,
.gcalc-choice legend,
.gcalc-group > legend {
  font-weight: 600;
}

.gcalc-unit {
  font-weight: 400;
  color: var(--gcalc-muted);
}

.gcalc input[type="text"],
.gcalc select {
  width: 100%;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gcalc-border);
  border-radius: 6px;
  background: #fff;
  color: var(--gcalc-text);
  font: inherit;
}

.gcalc input[aria-invalid="true"] {
  border: 2px solid var(--gcalc-error);
}

.gcalc-hint {
  margin: 0;
  font-size: 0.875rem;
  color: var(--gcalc-muted);
}

.gcalc-error {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gcalc-error);
}

.gcalc-error:empty {
  display: none;
}

.gcalc fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.gcalc-group {
  display: grid;
  gap: 1rem;
}

fieldset.gcalc-group:not(.gcalc-plain) {
  padding: 1rem;
  border: 1px solid var(--gcalc-border);
  border-radius: 6px;
  background: var(--gcalc-surface);
}

fieldset.gcalc-group > legend {
  padding: 0 0.25rem;
}

.gcalc-choice-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.gcalc-choice-options label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.25rem 0.875rem 0.25rem 0.625rem;
  border: 1px solid var(--gcalc-border);
  border-radius: 999px;
  cursor: pointer;
}

.gcalc-choice-options label:has(input:checked) {
  border-color: var(--gcalc-accent);
  background: var(--gcalc-surface);
  box-shadow: inset 0 0 0 1px var(--gcalc-accent);
}

.gcalc input[type="radio"],
.gcalc input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  margin: 0;
  accent-color: var(--gcalc-accent);
}

.gcalc-check {
  grid-template-columns: auto 1fr;
  align-items: center;
  column-gap: 0.625rem;
}

.gcalc-check > label {
  display: flex;
  align-items: center;
  min-height: 44px;
  cursor: pointer;
}

.gcalc-check .gcalc-hint {
  grid-column: 2;
}

.gcalc-notice:empty,
.gcalc-action-status:empty {
  display: none;
}

.gcalc-notice {
  margin: 0;
  padding: 0.625rem 0.875rem;
  border-left: 4px solid var(--gcalc-accent);
  background: var(--gcalc-surface);
}

.gcalc-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.gcalc-button {
  min-height: 44px;
  padding: 0.5rem 1.125rem;
  border: 1px solid var(--gcalc-accent);
  border-radius: 6px;
  background: #fff;
  color: var(--gcalc-accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.gcalc-button--primary {
  background: var(--gcalc-accent);
  color: var(--gcalc-accent-text);
}

.gcalc-button:hover {
  text-decoration: underline;
}

.gcalc-action-status {
  font-size: 0.9375rem;
  color: var(--gcalc-muted);
}

.gcalc input:focus-visible,
.gcalc select:focus-visible,
.gcalc button:focus-visible,
.gcalc a:focus-visible {
  outline: 3px solid var(--gcalc-focus);
  outline-offset: 2px;
}

.gcalc-results {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: 6px;
  background: var(--gcalc-surface);
}

.gcalc-results-title {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
}

.gcalc-list {
  display: grid;
  gap: 0;
  margin: 0;
}

.gcalc-list > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid #d6d1c8;
}

.gcalc-list dt {
  color: var(--gcalc-muted);
}

.gcalc-list dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.gcalc-list .is-key dt,
.gcalc-list .is-key dd {
  color: var(--gcalc-text);
  font-weight: 700;
}

.gcalc-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
}

.gcalc-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.gcalc-table caption {
  margin-bottom: 0.5rem;
  font-weight: 600;
  text-align: left;
}

.gcalc-table th,
.gcalc-table td {
  padding: 0.5rem;
  border-bottom: 1px solid #d6d1c8;
  text-align: right;
  white-space: nowrap;
}

.gcalc-table th:first-child,
.gcalc-table thead th:first-child {
  text-align: left;
}

.gcalc-note,
.gcalc-placeholder {
  margin: 0.75rem 0 0;
  font-size: 0.9375rem;
  color: var(--gcalc-muted);
}

.gcalc-placeholder {
  margin-top: 0;
}

.gcalc-offscreen {
  position: fixed;
  top: -1000px;
  left: -1000px;
}

.gcalc-config-error {
  padding: 0.75rem;
  border: 2px solid #a3221b;
  color: #a3221b;
}

@media (prefers-reduced-motion: no-preference) {
  .gcalc-button,
  .gcalc-choice-options label {
    transition: background-color 0.15s, box-shadow 0.15s;
  }
}