/* ─── Breadcrumb (reuse from article.css pattern) ─── */
.howto-breadcrumb-bar {
  background: var(--mk-cream);
  border-bottom: 1px solid var(--mk-line);
  padding: 0.65rem 0;
}

.howto-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--mk-muted);
}

.howto-breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--mk-line);
}

.howto-breadcrumb a {
  color: var(--mk-sage-dark);
  text-decoration: none;
}

.howto-breadcrumb a:hover {
  color: var(--mk-navy);
}

/* ─── Hero ─── */
.calc-hero {
  padding: 4rem 0 3rem;
  background:
    linear-gradient(90deg, rgba(246, 241, 232, 0.98), rgba(246, 241, 232, 0.78)),
    linear-gradient(145deg, var(--mk-sage), var(--mk-ivory));
}

.calc-hero-title {
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  line-height: 1.05;
  max-width: 18ch;
  margin-bottom: 1rem;
}

.calc-hero-lead {
  max-width: 58ch;
  color: #48423b;
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  margin-bottom: 0;
}

/* ─── Stat bar ─── */
.calc-stat-bar {
  background: var(--mk-navy);
  padding: 1.5rem 0;
}

.calc-stats {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.calc-stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.5rem 1.5rem;
  min-width: 160px;
}

.calc-stat-divider {
  width: 1px;
  height: 42px;
  background: rgba(201, 205, 185, 0.25);
  flex-shrink: 0;
}

.calc-stat-label {
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mk-sage);
}

.calc-stat-value {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 900;
  color: var(--mk-cream);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1;
}

.calc-stat-value--warn {
  color: #e8a07a;
}

.calc-stat-value--savings {
  color: #a3c48a;
}

/* ─── Main section layout ─── */
.calc-main-section {
  padding: 3rem 0 2rem;
  background: var(--mk-ivory);
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  align-items: start;
}

/* ─── Chart panel ─── */
.calc-chart-panel {
  background: var(--mk-cream);
  border: 1px solid var(--mk-line);
  border-radius: 16px;
  padding: 1.75rem;
}

.calc-chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.calc-chart-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--mk-navy);
  margin: 0;
}

.calc-legend {
  display: flex;
  gap: 1rem;
  flex-shrink: 0;
}

.calc-legend-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--mk-muted);
}

.calc-legend-item::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 4px;
  border-radius: 2px;
  flex-shrink: 0;
}

.calc-legend-item--maintained::before {
  background: #8f9775;
}

.calc-legend-item--neglected::before {
  background: #a0522d;
}

.calc-chart-wrap {
  position: relative;
  height: 380px;
}

.calc-chart-note {
  margin-top: 1rem;
  margin-bottom: 0;
  font-size: 0.8rem;
  color: var(--mk-muted);
  font-style: italic;
}

/* ─── Controls panel ─── */
.calc-controls-panel {
  background: var(--mk-cream);
  border: 1px solid var(--mk-line);
  border-radius: 16px;
  padding: 1.5rem;
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.calc-controls-header {
  flex-shrink: 0;
  margin-bottom: 0.75rem;
}

.calc-controls-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--mk-navy);
  margin-bottom: 0.4rem;
}

.calc-controls-sub {
  font-size: 0.82rem;
  color: var(--mk-muted);
  margin-bottom: 0.75rem;
}

.calc-select-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--mk-muted);
}

.calc-text-btn {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--mk-claret);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.calc-text-btn:hover {
  color: var(--mk-navy);
}

.calc-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--mk-line) transparent;
}

.calc-checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--mk-line);
  cursor: pointer;
}

.calc-checklist-item:last-child {
  border-bottom: none;
}

.calc-checklist-item input[type="checkbox"] {
  margin-top: 2px;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--mk-sage-dark);
  cursor: pointer;
}

.calc-checklist-item label {
  cursor: pointer;
  line-height: 1.3;
}

.calc-item-name {
  display: block;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--mk-navy);
}

.calc-item-meta {
  display: block;
  font-size: 0.74rem;
  color: var(--mk-muted);
  margin-top: 0.1rem;
}

.calc-checklist-item:has(input:not(:checked)) .calc-item-name {
  color: var(--mk-muted);
}

/* ─── Data table section ─── */
.calc-table-section {
  padding: 3rem 0 4rem;
  background: var(--mk-cream);
}

.calc-table-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--mk-navy);
  margin-bottom: 0.5rem;
}

.calc-table-sub {
  font-size: 0.88rem;
  color: var(--mk-muted);
  margin-bottom: 1.5rem;
}

.calc-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--mk-line);
  border-radius: 12px;
}

.calc-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 700px;
}

.calc-data-table thead tr {
  background: var(--mk-navy);
}

.calc-data-table thead th {
  padding: 0.85rem 1rem;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mk-sage);
  text-align: left;
  white-space: nowrap;
}

.calc-data-table tbody tr {
  border-bottom: 1px solid var(--mk-line);
  transition: background 0.12s;
}

.calc-data-table tbody tr:last-child {
  border-bottom: none;
}

.calc-data-table tbody tr:hover {
  background: rgba(188, 194, 170, 0.12);
}

.calc-data-table tbody td {
  padding: 0.75rem 1rem;
  color: var(--mk-ink);
  vertical-align: middle;
}

.calc-data-table tbody td:first-child {
  font-weight: 700;
  color: var(--mk-navy);
}

.calc-data-table .td-cost {
  color: var(--mk-sage-dark);
  font-weight: 700;
  white-space: nowrap;
}

.calc-data-table .td-replace-cost {
  color: #a0522d;
  font-weight: 700;
  white-space: nowrap;
}

.calc-data-table .td-life {
  font-weight: 600;
  color: var(--mk-muted);
  white-space: nowrap;
}

/* ─── FAQ section ─── */
.calc-faq-section {
  padding: 3rem 0 4rem;
  background: var(--mk-ivory);
}

.calc-faq-header {
  margin-bottom: 2rem;
}

.calc-faq-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--mk-navy);
  margin-bottom: 0;
}

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

.calc-faq-item {
  background: var(--mk-cream);
  border: 1px solid var(--mk-line);
  border-radius: 12px;
  overflow: hidden;
}

.calc-faq-item[open] {
  border-color: var(--mk-sage-dark);
}

.calc-faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--mk-navy);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.calc-faq-question::-webkit-details-marker {
  display: none;
}

.calc-faq-question::after {
  content: "+";
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--mk-sage);
  color: var(--mk-navy);
  font-size: 1rem;
  font-weight: 900;
  line-height: 1;
  transition: background 0.15s, transform 0.2s;
}

.calc-faq-item[open] .calc-faq-question::after {
  content: "−";
  background: var(--mk-sage-dark);
  color: #fff;
  transform: rotate(180deg);
}

.calc-faq-answer {
  padding: 0 1.25rem 1.1rem;
  border-top: 1px solid var(--mk-line);
}

.calc-faq-answer p {
  font-size: 0.9rem;
  color: var(--mk-muted);
  margin-bottom: 0.5rem;
}

.calc-faq-answer p:last-child {
  margin-bottom: 0;
}

.calc-faq-answer ul {
  margin: 0.5rem 0 0.75rem 1.1rem;
  padding: 0;
  font-size: 0.9rem;
  color: var(--mk-muted);
}

.calc-faq-answer ul li {
  margin-bottom: 0.3rem;
}

.calc-faq-answer strong {
  color: var(--mk-ink);
}

/* ─── CTA band ─── */
.howto-cta-band {
  padding: 5rem 0;
  background: var(--mk-navy);
}

.howto-cta-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.howto-cta-copy .eyebrow {
  color: var(--mk-sage);
}

.howto-cta-copy h2 {
  color: var(--mk-cream);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  line-height: 1.1;
  margin-bottom: 1rem;
}

.howto-cta-copy p {
  color: rgba(255, 250, 240, 0.7);
}

.howto-cta-action .launch-box {
  padding: 2rem;
  border: 2px solid rgba(201, 205, 185, 0.3);
  text-align: center;
}

.howto-cta-action .launch-box .eyebrow {
  color: var(--mk-brass);
}

.howto-cta-action .launch-box p {
  color: rgba(255, 250, 240, 0.8);
  max-width: 340px;
  margin: 0.5rem auto 1.25rem;
}

.howto-cta-fine {
  display: block;
  font-size: 0.78rem !important;
  color: rgba(255, 250, 240, 0.45) !important;
  margin-top: 0.75rem;
  margin-bottom: 0 !important;
}

/* ─── Footer ─── */
.howto-footer {
  background: var(--mk-claret);
  padding: 2rem 0;
  color: rgba(255, 250, 240, 0.7);
}

.howto-footer .navbar-brand span {
  color: var(--mk-cream);
}

.howto-footer p {
  margin: 0.5rem 0 0;
  color: rgba(255, 250, 240, 0.5);
  font-size: 0.84rem;
}

/* ─── Home page promo strip ─── */
.calc-promo-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 2.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding: 1.75rem 2rem;
  background: var(--mk-navy);
  border-radius: 16px;
}

.calc-promo-copy {
  flex: 1;
  min-width: 200px;
}

.calc-promo-copy .eyebrow {
  color: var(--mk-sage);
}

.calc-promo-copy strong {
  display: block;
  color: var(--mk-cream);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.calc-promo-copy p {
  margin: 0;
  color: rgba(255, 250, 240, 0.65);
  font-size: 0.95rem;
}

/* ─── Responsive ─── */
@media (max-width: 1199.98px) {
  .calc-layout {
    grid-template-columns: 1fr 300px;
  }
}

@media (max-width: 991.98px) {
  .calc-faq-grid {
    grid-template-columns: 1fr;
  }

  .calc-layout {
    grid-template-columns: 1fr;
  }

  .calc-controls-panel {
    position: static;
    max-height: none;
  }

  .calc-checklist {
    overflow-y: visible;
  }

  .howto-cta-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 575.98px) {
  .calc-hero {
    padding: 2.5rem 0 2rem;
  }

  .calc-stats {
    flex-direction: column;
    align-items: stretch;
  }

  .calc-stat-divider {
    display: none;
  }

  .calc-stat {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(201, 205, 185, 0.2);
  }

  .calc-stat:last-child {
    border-bottom: none;
  }

  .calc-chart-wrap {
    height: 260px;
  }
}