/* ==========================================================================
   Calculator landing pages — shared resource layout
   ========================================================================== */

.calc-landing {
  --calc-max: 720px;
  padding-bottom: 4rem;
}

.calc-landing .site-container {
  max-width: 1120px;
}

/* --- Hero --------------------------------------------------------------- */

.calc-hero {
  padding: 1.5rem 0 2rem;
}

/* Line the intro paragraph up with the heading (site.css centres it with margin: 0 auto). */
.calc-hero .page-hero__subtitle {
  margin: 0;
  max-width: 40rem;
}

.calc-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 0.85rem 0 1.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.calc-hero__meta strong {
  color: var(--color-text);
  font-weight: 600;
}

.calc-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.calc-hero__actions .btn {
  min-height: 2.75rem;
}

/* --- Section shell ------------------------------------------------------ */

.calc-section {
  margin-top: 2.75rem;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.calc-section__eyebrow {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.calc-section__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.calc-section__lead {
  margin: 0 0 1.25rem;
  max-width: 40rem;
  color: var(--color-text-muted);
  font-size: 0.9875rem;
  line-height: 1.6;
}

/* --- Calculator card ---------------------------------------------------- */

.calc-card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.calc-card__fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.calc-card__hint {
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.calc-card__error {
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
  color: #b42318;
}

.calc-card__field.is-invalid .form-input,
.calc-card__field.is-invalid .form-select {
  border-color: #b42318;
}

.calc-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.calc-card__toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.calc-card__toolbar .btn {
  font-size: 0.8125rem;
}

.calc-radios {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.calc-radio {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.calc-radio:hover,
.calc-radio:has(input:checked) {
  border-color: var(--color-accent);
  background: rgba(45, 106, 79, 0.06);
}

.calc-radio input {
  accent-color: var(--color-accent);
}

/* --- Results ------------------------------------------------------------ */

.calc-results {
  margin-top: 1.25rem;
}

.calc-results[hidden] {
  display: none;
}

.calc-results.is-success {
  animation: calcPop 0.35s ease;
}

@keyframes calcPop {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.calc-results__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.calc-result-card {
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-accent-light);
}

.calc-result-card--muted {
  background: var(--color-surface);
}

.calc-result-card--warn {
  background: #fff7ed;
  border-color: #fdba74;
}

.calc-result-card__label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.calc-result-card__value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent-hover);
  line-height: 1.3;
}

.calc-result-card p {
  margin: 0.35rem 0 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.calc-results__list {
  margin: 0.85rem 0 0;
  padding-left: 1.15rem;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.calc-results__list li + li {
  margin-top: 0.4rem;
}

/* --- Content blocks ----------------------------------------------------- */

.calc-steps {
  display: grid;
  gap: 0.85rem;
  counter-reset: calc-step;
}

.calc-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.calc-step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.875rem;
}

.calc-step__diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 4.5rem;
  margin-top: 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(45, 106, 79, 0.08);
  color: var(--color-accent);
  font-size: 1.75rem;
}

.calc-prose {
  max-width: 42rem;
  color: var(--color-text-muted);
  font-size: 0.9875rem;
  line-height: 1.7;
}

.calc-prose p + p {
  margin-top: 0.85rem;
}

.calc-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.calc-info-card {
  padding: 1.1rem 1.2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.calc-info-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.calc-info-card--warn {
  border-color: #fdba74;
  background: #fffaf5;
}

.calc-info-card__icon {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1.35rem;
}

.calc-info-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.calc-info-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* --- FAQ ---------------------------------------------------------------- */

.calc-faq {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.calc-faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: 0.85rem 1rem;
}

.calc-faq__item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  list-style: none;
}

.calc-faq__item summary::-webkit-details-marker {
  display: none;
}

.calc-faq__item summary::after {
  content: "+";
  float: right;
  color: var(--color-accent);
  font-weight: 700;
}

.calc-faq__item[open] summary::after {
  content: "–";
}

.calc-faq__item p {
  margin: 0.7rem 0 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Related grids ------------------------------------------------------ */

.calc-link-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.calc-link-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), transform var(--transition);
}

.calc-link-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.calc-link-card__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.calc-link-card__title {
  font-size: 1rem;
  font-weight: 700;
}

.calc-link-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.calc-plant-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.calc-plant-card {
  display: flex;
  flex-direction: column;
  padding: 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.calc-plant-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.calc-plant-card__icon {
  font-size: 1.75rem;
  margin-bottom: 0.35rem;
}

.calc-plant-card__name {
  font-weight: 700;
  font-size: 0.9rem;
}

.calc-plant-card__note {
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* --- Download / CTAs ---------------------------------------------------- */

.calc-download {
  display: grid;
  gap: 0.75rem;
}

.calc-download__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.15rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.calc-cta-band {
  margin-top: 2.75rem;
  padding: 2rem 1.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(45, 106, 79, 0.12), rgba(45, 106, 79, 0.04));
  border: 1px solid var(--color-border);
  text-align: center;
}

.calc-cta-band h2 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
}

.calc-cta-band p {
  margin: 0 auto 1.15rem;
  max-width: 32rem;
  color: var(--color-text-muted);
}

.calc-cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.calc-status {
  margin-top: 0.65rem;
  font-size: 0.8125rem;
  color: var(--color-accent);
}

.calc-status[hidden] {
  display: none;
}

.calc-status--error {
  color: #b42318;
}

.btn.is-loading {
  opacity: 0.75;
  pointer-events: none;
}

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

/* --- Responsive --------------------------------------------------------- */

@media (min-width: 640px) {
  .calc-card__fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .calc-cards,
  .calc-link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calc-plant-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .calc-cards--3,
  .calc-link-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .calc-plant-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 639px) {
  .calc-hero__actions .btn,
  .calc-card__actions .btn,
  .calc-card__toolbar .btn,
  .calc-cta-band__actions .btn,
  .calc-download__item .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .calc-results.is-success,
  .calc-info-card,
  .calc-link-card,
  .calc-plant-card {
    animation: none;
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .calc-hero__actions,
  .calc-card__toolbar,
  .calc-cta-band,
  .hamburger-btn {
    display: none !important;
  }

  .calc-card,
  .calc-info-card {
    box-shadow: none;
  }
}