html {
  overflow-x: hidden;
}

.post-page {
  --post-stone: #57534e;
  --post-stone-deep: #292524;
  --post-amber: #b45309;
  --post-green: #166534;
  --post-red: #b91c1c;
  --post-blue: #2563eb;
  --post-line: rgba(87, 83, 78, 0.24);
  --post-panel: rgba(255, 255, 255, 0.72);
  --post-panel-strong: rgba(250, 250, 249, 0.92);
  --post-svg-stroke: #292524;
  --bg: #f5f5f4;
  --bg-elevated: var(--post-panel);
  --bg-strong: var(--post-panel-strong);
  --text: #1c1917;
  --text-soft: #57534e;
  --line: var(--post-line);
  --line-strong: rgba(87, 83, 78, 0.34);
  --brand: var(--post-stone);
  --brand-deep: var(--post-stone-deep);
  --accent: var(--post-amber);
  --accent-deep: #92400e;
  overflow-x: hidden;
}

:root[data-theme="dark"] .post-page {
  --post-line: rgba(231, 229, 228, 0.16);
  --post-panel: rgba(28, 25, 23, 0.74);
  --post-panel-strong: rgba(41, 37, 36, 0.9);
  --post-svg-stroke: #fafaf9;
  --post-stone: #d6d3d1;
  --post-stone-deep: #fafaf9;
  --post-amber: #fbbf24;
  --post-green: #86efac;
  --post-red: #fca5a5;
  --bg: #0c0a09;
  --bg-elevated: var(--post-panel);
  --bg-strong: var(--post-panel-strong);
  --text: #fafaf9;
  --text-soft: #d6d3d1;
  --line: var(--post-line);
  --line-strong: rgba(231, 229, 228, 0.28);
  --brand: var(--post-stone);
  --brand-deep: #fafaf9;
  --accent: var(--post-amber);
  --accent-deep: #fde68a;
}

.post-page *,
.post-page *::before,
.post-page *::after {
  min-width: 0;
}

.post-page .reveal {
  opacity: 1;
  transform: none;
}

.post-page .site-header {
  border-bottom-color: var(--post-line);
}

.post-page .logo,
.post-page h1,
.post-page h2,
.post-page h3 {
  letter-spacing: 0;
}

.post-page .section-heading h2 {
  max-width: 980px;
  font-size: clamp(2rem, 3vw, 2.75rem);
  letter-spacing: 0;
}

.post-hero {
  padding: 3.25rem 0 2rem;
}

.post-hero-grid,
.post-calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: 1.25rem;
  align-items: start;
}

.post-hero h1 {
  margin: 0.65rem 0 0.45rem;
}

.post-subtitle {
  max-width: 780px;
  margin: 0;
  color: var(--text-soft);
  font-size: 1.08rem;
  overflow-wrap: break-word;
}

.post-alert {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  max-width: 850px;
  margin: 1.25rem 0;
  padding: 1rem;
  border-left: 4px solid #78716c;
  border-radius: 0 16px 16px 0;
  background: #fafaf9;
  color: #292524;
}

:root[data-theme="dark"] .post-alert {
  background: rgba(68, 64, 60, 0.42);
  color: #fafaf9;
}

.post-alert strong {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--font-heading);
}

.post-hero-list {
  display: grid;
  gap: 0.35rem;
  margin: 1.2rem 0;
  padding: 0;
  color: var(--text-soft);
  list-style: none;
}

.post-hero-list li::before {
  content: "✓";
  margin-right: 0.5rem;
  color: var(--post-green);
  font-weight: 900;
}

.post-diagram-card,
.post-tool-panel,
.post-results-panel,
.post-preview-card,
.post-estimate-card,
.post-info-card,
.post-related-card,
.post-planning-details details,
.post-faq details,
.frost-alert {
  border: 1px solid var(--post-line);
  background: var(--post-panel);
  box-shadow: var(--shadow-soft);
}

.post-diagram-card {
  padding: 1rem;
  border-radius: 18px;
  color: var(--post-svg-stroke);
}

.post-diagram-card svg,
.post-preview-stage svg {
  display: block;
  width: 100%;
  height: auto;
}

.post-diagram-card text,
.post-preview-stage text {
  font-family: var(--font-body);
}

.post-tool-panel,
.post-results-panel {
  border-radius: 20px;
  padding: 1rem;
}

.post-results-panel {
  display: grid;
  gap: 1rem;
}

.post-calculator-title,
.estimate-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.post-calculator-title h2,
.estimate-head h3,
.post-estimate-card h3,
.post-info-card h3,
.post-related-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  letter-spacing: -0.03em;
}

.post-small,
.estimate-head p,
.post-field-help {
  margin: 0.2rem 0 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.post-mode-switch,
.post-preview-tabs,
.post-step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.post-mode-switch button,
.post-preview-tabs button,
.post-step-actions button,
.post-action {
  min-height: 42px;
  border: 1px solid var(--post-line);
  border-radius: 999px;
  padding: 0.65rem 0.9rem;
  background: rgba(255, 255, 255, 0.45);
  color: var(--text);
  font-weight: 800;
}

:root[data-theme="dark"] .post-mode-switch button,
:root[data-theme="dark"] .post-preview-tabs button,
:root[data-theme="dark"] .post-step-actions button,
:root[data-theme="dark"] .post-action {
  background: rgba(255, 255, 255, 0.06);
}

.post-mode-switch button[aria-pressed="true"],
.post-preview-tabs button[aria-selected="true"],
.post-action.primary {
  border-color: rgba(87, 83, 78, 0.58);
  background: linear-gradient(135deg, rgba(87, 83, 78, 0.18), rgba(180, 83, 9, 0.14));
  color: var(--brand-deep);
}

.post-progress {
  display: none;
  gap: 0.65rem;
  margin-bottom: 1rem;
  color: var(--text-soft);
  font-weight: 800;
}

.post-progress.is-visible {
  display: grid;
}

.post-progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(120, 113, 108, 0.18);
}

.post-progress-track span {
  display: block;
  width: 16.666%;
  height: 100%;
  border-radius: inherit;
  background: #57534e;
  transition: width 180ms ease;
}

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

.post-fieldset {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--post-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.36);
}

:root[data-theme="dark"] .post-fieldset {
  background: rgba(255, 255, 255, 0.04);
}

.post-fieldset[hidden] {
  display: none;
}

.post-fieldset legend {
  padding: 0 0.3rem;
  font-family: var(--font-heading);
  font-weight: 900;
}

.post-choice-grid,
.post-choice-row,
.post-count-box,
.post-how-grid,
.post-related-grid,
.concrete-cards,
.mistake-grid {
  display: grid;
  gap: 0.75rem;
}

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

.post-choice-row {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.post-choice input[type="radio"] {
  position: absolute;
  opacity: 0;
}

.post-choice label {
  display: grid;
  gap: 0.25rem;
  min-height: 74px;
  padding: 0.8rem;
  border: 1px solid var(--post-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.46);
  cursor: pointer;
}

:root[data-theme="dark"] .post-choice label {
  background: rgba(255, 255, 255, 0.04);
}

.post-choice input:checked + label {
  border-color: rgba(87, 83, 78, 0.72);
  background: linear-gradient(135deg, rgba(87, 83, 78, 0.16), rgba(180, 83, 9, 0.1));
}

.post-choice span,
.post-choice label > span {
  color: var(--text-soft);
  font-size: 0.86rem;
}

.post-choice.custom-choice label {
  grid-template-columns: auto 1fr auto;
  align-items: center;
}

.post-form label {
  display: grid;
  gap: 0.4rem;
}

.post-form input[type="number"],
.post-form select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--post-line);
  border-radius: 12px;
  padding: 0.62rem 0.72rem;
  background: var(--bg-strong);
  color: var(--text);
}

.post-count-box {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 1rem;
  border: 1px solid var(--post-line);
  border-radius: 16px;
  background: rgba(120, 113, 108, 0.08);
}

.post-count-box > div {
  display: grid;
  gap: 0.4rem;
  color: var(--text-soft);
}

.post-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--post-line);
  border-radius: 999px;
  color: var(--brand);
  font-size: 0.8rem;
  font-weight: 850;
}

.post-preview-card,
.post-estimate-card,
.post-info-card,
.post-related-card,
.frost-alert {
  border-radius: 18px;
  padding: 1rem;
}

.post-preview-stage {
  min-height: 280px;
  display: grid;
  place-items: center;
  overflow: hidden;
  margin-top: 0.8rem;
  border: 1px solid var(--post-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.32);
  color: var(--post-svg-stroke);
}

:root[data-theme="dark"] .post-preview-stage {
  background: rgba(255, 255, 255, 0.04);
}

.post-section-title {
  margin: 1rem 0 0.55rem;
  color: var(--brand);
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.post-materials,
.post-budget-lines {
  display: grid;
  gap: 0.55rem;
}

.post-material-row,
.post-budget-lines div {
  display: grid;
  grid-template-columns: minmax(110px, 0.95fr) minmax(95px, 0.7fr) minmax(130px, 1fr);
  gap: 0.75rem;
  align-items: start;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--post-line);
}

.post-budget-lines div {
  grid-template-columns: minmax(110px, 0.7fr) minmax(0, 1.4fr);
}

.post-material-row span:last-child,
.post-budget-lines span:last-child {
  color: var(--text-soft);
}

.post-material-row.total {
  color: var(--brand-deep);
  font-weight: 900;
}

.frost-alert {
  border-left: 4px solid #38bdf8;
  background: rgba(224, 242, 254, 0.72);
}

:root[data-theme="dark"] .frost-alert {
  background: rgba(12, 74, 110, 0.3);
}

.frost-alert p {
  margin: 0.55rem 0 0;
  color: var(--text-soft);
}

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

.concrete-cards article {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem;
  border: 1px solid var(--post-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.35);
}

:root[data-theme="dark"] .concrete-cards article {
  background: rgba(255, 255, 255, 0.04);
}

.concrete-cards article > span {
  color: var(--post-amber);
  font-weight: 900;
}

.concrete-cards p,
.concrete-cards em {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.post-how-grid,
.post-related-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.post-info-card {
  display: grid;
  gap: 0.65rem;
}

.post-info-card p,
.post-related-card p,
.post-planning-details p,
.post-faq p {
  color: var(--text-soft);
  overflow-wrap: break-word;
}

.post-guide-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.post-anchor-nav {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  display: grid;
  gap: 0.5rem;
  padding: 0.9rem;
  border: 1px solid var(--post-line);
  border-radius: 16px;
  background: var(--post-panel);
}

.post-anchor-nav a {
  color: var(--text-soft);
  font-weight: 800;
}

.post-planning-details,
.post-faq {
  display: grid;
  gap: 0.85rem;
}

.post-planning-details details,
.post-faq details {
  border-radius: 18px;
  overflow: hidden;
}

.post-planning-details summary,
.post-faq summary {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 900;
  list-style: none;
}

.post-planning-details summary::-webkit-details-marker,
.post-faq summary::-webkit-details-marker {
  display: none;
}

.post-planning-details summary::after,
.post-faq summary::after {
  content: "+";
  color: var(--brand);
  font-size: 1.35rem;
}

.post-planning-details details[open] summary::after,
.post-faq details[open] summary::after {
  content: "-";
}

.post-planning-details details > div,
.post-faq details > div {
  display: grid;
  gap: 0.9rem;
  padding: 0 1.1rem 1.15rem;
}

.post-formula {
  padding: 0.9rem 1rem;
  border: 1px dashed var(--post-line);
  border-radius: 14px;
  background: rgba(120, 113, 108, 0.08);
  color: var(--brand-deep);
  font-weight: 850;
}

.post-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--post-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.26);
  -webkit-overflow-scrolling: touch;
}

.post-table-wrap table {
  min-width: 620px;
}

.post-table-wrap th,
.post-table-wrap td {
  padding: 0.8rem;
}

.post-tip {
  margin: 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--post-amber);
  border-radius: 0 14px 14px 0;
  background: rgba(251, 191, 36, 0.1);
}

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

.mistake-grid article {
  padding: 0.85rem;
  border-left: 4px solid var(--post-red);
  border-radius: 0 14px 14px 0;
  background: rgba(248, 113, 113, 0.08);
}

.mistake-grid p {
  margin: 0.3rem 0 0;
}

.post-related-card {
  display: grid;
  gap: 0.55rem;
}

.post-related-card span {
  color: var(--brand);
  font-weight: 900;
}

.post-related-card h3,
.post-related-card p {
  margin: 0;
}

.post-related-card a {
  color: var(--brand);
  font-weight: 850;
  overflow-wrap: anywhere;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 80;
  display: grid;
  gap: 0.2rem;
  max-width: min(360px, calc(100vw - 2rem));
  padding: 0.9rem 1rem;
  border: 1px solid var(--post-line);
  border-radius: 14px;
  background: var(--bg-strong);
  color: var(--text);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: 180ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .post-hero-grid,
  .post-calculator-grid,
  .post-guide-layout {
    grid-template-columns: 1fr;
  }

  .post-anchor-nav {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .post-how-grid,
  .post-related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .post-hero {
    padding-top: 2.2rem;
  }

  .post-hero h1 {
    font-size: clamp(2.25rem, 10vw, 3.4rem);
  }

  .post-page .logo-tag {
    display: none;
  }

  .post-alert {
    grid-template-columns: 1fr;
  }

  .post-hero p,
  .post-hero li {
    overflow-wrap: anywhere;
  }

  .post-choice-grid,
  .post-choice-row,
  .post-count-box,
  .post-how-grid,
  .post-related-grid,
  .concrete-cards,
  .mistake-grid {
    grid-template-columns: 1fr;
  }

  .post-calculator-title,
  .estimate-head {
    display: grid;
  }

  .post-material-row,
  .post-budget-lines div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .post-tool-panel,
  .post-results-panel,
  .post-preview-card,
  .post-estimate-card,
  .post-info-card,
  .post-related-card {
    border-radius: 16px;
    padding: 0.9rem;
  }

  .post-anchor-nav {
    grid-template-columns: 1fr;
  }

  .post-action,
  .post-step-actions button {
    width: 100%;
  }
}