html {
  overflow-x: hidden;
}

.chain-page {
  --chain-zinc: #52525b;
  --chain-zinc-dark: #3f3f46;
  --chain-zinc-soft: rgba(82, 82, 91, 0.12);
  --chain-line: rgba(82, 82, 91, 0.22);
  --chain-panel: rgba(255, 255, 255, 0.72);
  --chain-panel-strong: rgba(250, 250, 250, 0.88);
  --chain-green: #16a34a;
  --chain-stone: #78716c;
  --chain-svg-stroke: #27272a;
  overflow-x: hidden;
}

:root[data-theme="dark"] .chain-page {
  --chain-line: rgba(244, 244, 245, 0.18);
  --chain-panel: rgba(24, 24, 27, 0.76);
  --chain-panel-strong: rgba(39, 39, 42, 0.88);
  --chain-svg-stroke: #e4e4e7;
}

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

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

.chain-hero-grid,
.chain-calculator-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1fr) minmax(370px, 0.92fr);
  align-items: start;
}

.chain-hero-grid > *,
.chain-calculator-grid > *,
.guide-layout > * {
  min-width: 0;
}

.chain-hero h1 {
  margin: 0.6rem 0 0.35rem;
  max-width: 100%;
  text-wrap: balance;
}

.chain-eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.42rem 0.78rem;
  border: 1px solid var(--chain-line);
  border-radius: 999px;
  color: var(--chain-zinc-dark);
  background: var(--chain-zinc-soft);
  font-weight: 900;
}

:root[data-theme="dark"] .chain-eyebrow {
  color: #e4e4e7;
}

.chain-subtitle {
  max-width: 760px;
  margin: 0;
  color: var(--text-soft);
  font-size: 1.08rem;
}

.chain-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 #71717a;
  border-radius: 0 16px 16px 0;
  background: #fafafa;
  color: #27272a;
}

:root[data-theme="dark"] .chain-alert {
  background: rgba(82, 82, 91, 0.28);
  color: #f4f4f5;
}

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

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

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

.chain-diagram-card,
.chain-tool-panel,
.chain-results-panel,
.chain-info-card,
.chain-related-card {
  border: 1px solid var(--chain-line);
  background: var(--chain-panel);
  box-shadow: var(--shadow-soft);
}

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

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

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

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

.chain-calculator-title {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

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

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

.chain-mode-switch button,
.chain-preview-tabs button,
.chain-step-actions button,
.chain-action {
  min-height: 42px;
  border: 1px solid var(--chain-line);
  border-radius: 999px;
  padding: 0.65rem 0.9rem;
  background: rgba(255, 255, 255, 0.44);
  color: var(--text);
  font-weight: 800;
}

:root[data-theme="dark"] .chain-mode-switch button,
:root[data-theme="dark"] .chain-preview-tabs button,
:root[data-theme="dark"] .chain-step-actions button,
:root[data-theme="dark"] .chain-action {
  background: rgba(255, 255, 255, 0.05);
}

.chain-mode-switch button[aria-pressed="true"],
.chain-preview-tabs button[aria-selected="true"],
.chain-action.primary {
  border-color: rgba(82, 82, 91, 0.68);
  background: linear-gradient(135deg, rgba(82, 82, 91, 0.16), rgba(22, 163, 74, 0.1));
  color: var(--chain-zinc-dark);
}

:root[data-theme="dark"] .chain-mode-switch button[aria-pressed="true"],
:root[data-theme="dark"] .chain-preview-tabs button[aria-selected="true"],
:root[data-theme="dark"] .chain-action.primary {
  color: #f4f4f5;
}

.chain-mode-switch .active-tab {
  border-radius: 12px 12px 0 0;
  border-bottom: 2px solid #52525b;
}

.chain-progress {
  display: none;
  gap: 0.75rem;
  align-items: center;
  margin: 0 0 1rem;
  color: var(--text-soft);
  font-weight: 800;
}

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

.chain-progress-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(120, 113, 108, 0.18);
}

.chain-progress-fill {
  display: block;
  width: 14.28%;
  height: 100%;
  background: linear-gradient(90deg, #52525b, #a1a1aa);
  transition: width 180ms ease;
}

.chain-form {
  display: grid;
  gap: 0.95rem;
  grid-template-columns: minmax(0, 1fr);
}

.chain-fieldset {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: minmax(0, 1fr);
  margin: 0;
  padding: 0.95rem;
  border: 1px solid var(--chain-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.28);
}

:root[data-theme="dark"] .chain-fieldset {
  background: rgba(255, 255, 255, 0.035);
}

.chain-fieldset legend {
  padding: 0 0.35rem;
  font-weight: 900;
  color: var(--text);
}

.chain-choice-grid {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.chain-choice {
  position: relative;
}

.chain-choice input {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.chain-choice label {
  display: grid;
  gap: 0.22rem;
  min-height: 100%;
  padding: 0.82rem;
  border: 1px solid var(--chain-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.42);
  transition: 160ms ease;
}

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

.chain-choice input:checked + label {
  border-color: rgba(82, 82, 91, 0.7);
  background: var(--chain-zinc-soft);
}

.chain-choice span,
.chain-field-help,
.chain-small,
.chain-results-panel p,
.chain-info-card p,
.chain-related-card p {
  color: var(--text-soft);
}

.chain-input-row {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: minmax(140px, 0.72fr) minmax(0, 1fr);
  align-items: end;
}

.chain-fieldset input[type="number"],
.chain-fieldset select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--chain-line);
  border-radius: 14px;
  padding: 0.8rem 0.9rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.54);
}

:root[data-theme="dark"] .chain-fieldset input[type="number"],
:root[data-theme="dark"] .chain-fieldset select {
  background: rgba(255, 255, 255, 0.06);
}

.chain-fieldset input:focus-visible,
.chain-fieldset select:focus-visible,
.chain-choice:focus-within,
.chain-mode-switch button:focus-visible,
.chain-preview-tabs button:focus-visible,
.chain-action:focus-visible {
  outline: 2px solid rgba(82, 82, 91, 0.55);
  outline-offset: 2px;
}

.chain-map {
  display: none;
  gap: 0.65rem;
}

.chain-map.is-visible {
  display: grid;
}

.chain-map-canvas {
  position: relative;
  min-height: 220px;
  overflow: hidden;
  border: 1px dashed rgba(82, 82, 91, 0.58);
  border-radius: 16px;
  background:
    linear-gradient(90deg, rgba(120, 113, 108, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(120, 113, 108, 0.08) 1px, transparent 1px),
    rgba(82, 82, 91, 0.08);
  background-size: 28px 28px;
}

.chain-map-canvas svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.chain-map-point {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid #fafafa;
  border-radius: 50%;
  background: #52525b;
  transform: translate(-50%, -50%);
  box-shadow: 0 6px 16px rgba(39, 39, 42, 0.24);
}

.chain-preview-card,
.chain-estimate-card {
  display: grid;
  gap: 0.95rem;
  grid-template-columns: minmax(0, 1fr);
  padding: 1rem;
  border: 1px solid var(--chain-line);
  border-radius: 18px;
  background: var(--chain-panel-strong);
}

.chain-preview-stage {
  min-height: 260px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--chain-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.36);
  color: var(--chain-svg-stroke);
}

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

.estimate-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.estimate-total {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  padding: 0.9rem 0;
  border-top: 1px solid var(--chain-line);
  border-bottom: 1px solid var(--chain-line);
}

.estimate-total strong {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.chain-materials {
  display: grid;
  gap: 0.45rem;
  grid-template-columns: minmax(0, 1fr);
}

.chain-material-row {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: 1.05fr 0.62fr 1.45fr;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(120, 113, 108, 0.16);
}

.chain-material-row strong {
  font-family: var(--font-heading);
}

.chain-budget-lines {
  display: grid;
  gap: 0.4rem;
  padding-top: 0.35rem;
}

.chain-budget-line {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 800;
}

.chain-breakdown {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr);
}

.breakdown-track {
  display: flex;
  height: 34px;
  overflow: hidden;
  border: 1px solid var(--chain-line);
  border-radius: 999px;
  background: rgba(120, 113, 108, 0.14);
}

.breakdown-segment {
  min-width: 8%;
  border: 0;
  color: #fff;
  font-size: 0;
}

.breakdown-segment.materials {
  background: #52525b;
}

.breakdown-segment.labor {
  background: #78716c;
}

.breakdown-segment.gates {
  background: #16a34a;
}

.breakdown-rows {
  display: grid;
  gap: 0.45rem;
  grid-template-columns: minmax(0, 1fr);
}

.breakdown-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0.75rem;
  align-items: center;
  color: var(--text-soft);
}

.breakdown-detail {
  min-height: 42px;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--chain-line);
  border-radius: 12px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.28);
}

.chain-comparison,
.chain-simple-table {
  width: 100%;
  border-collapse: collapse;
}

.chain-comparison th,
.chain-comparison td,
.chain-simple-table th,
.chain-simple-table td {
  padding: 0.7rem;
  border-bottom: 1px solid var(--chain-line);
  text-align: left;
  vertical-align: top;
}

.chain-comparison th,
.chain-simple-table th {
  color: var(--text);
  background: rgba(82, 82, 91, 0.11);
  font-size: 0.88rem;
}

.chain-table-wrap {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
}

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

.chain-info-card,
.chain-related-card {
  display: grid;
  gap: 0.65rem;
  padding: 1rem;
  border-radius: 16px;
}

.guide-layout {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 0.32fr) minmax(0, 1fr);
  align-items: start;
}

.anchor-nav {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  display: grid;
  gap: 0.35rem;
  padding: 1rem;
  border: 1px solid var(--chain-line);
  border-radius: 16px;
  background: var(--chain-panel);
}

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

.planning-details {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr);
}

.planning-details details,
.chain-faq details {
  overflow: hidden;
  border: 1px solid var(--chain-line);
  border-radius: 16px;
  background: var(--chain-panel);
}

.planning-details summary,
.chain-faq summary {
  cursor: pointer;
  padding: 0.95rem 1rem;
  font-family: var(--font-heading);
  font-weight: 900;
}

.planning-details details > div,
.chain-faq details > div {
  padding: 0 1rem 1rem;
}

.chain-formula {
  overflow: auto;
  padding: 0.85rem;
  border: 1px solid var(--chain-line);
  border-radius: 12px;
  background: rgba(120, 113, 108, 0.1);
  font-weight: 800;
}

.chain-tip {
  padding: 0.85rem;
  border-left: 4px solid #16a34a;
  border-radius: 0 14px 14px 0;
  background: rgba(22, 163, 74, 0.1);
  color: var(--text-soft);
}

.chain-faq {
  display: grid;
  gap: 0.75rem;
}

.chain-related-card {
  min-height: 190px;
}

.chain-related-card a {
  color: var(--chain-zinc-dark);
  font-weight: 900;
}

:root[data-theme="dark"] .chain-related-card a {
  color: #e4e4e7;
}

.chain-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 30px;
  padding: 0.32rem 0.62rem;
  border: 1px solid var(--chain-line);
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 0.78rem;
  font-weight: 900;
}

.chain-material-row > *,
.breakdown-row > *,
.estimate-head > *,
.estimate-total > *,
.chain-budget-line > *,
.chain-field-help,
[data-share-output] {
  min-width: 0;
  overflow-wrap: anywhere;
}

.chain-hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .chain-hero-grid,
  .chain-calculator-grid,
  .guide-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .anchor-nav {
    position: static;
  }

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

@media (max-width: 720px) {
  .chain-page .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.75rem 0;
  }

  .chain-page .site-nav {
    justify-content: flex-start;
    width: 100%;
  }

  .chain-page .site-nav a,
  .chain-page .theme-toggle {
    padding: 0.55rem 0.7rem;
  }

  .chain-hero {
    padding-top: 2rem;
  }

  .chain-hero h1 {
    font-size: clamp(2rem, 8vw, 2.75rem);
    line-height: 1.12;
  }

  .chain-subtitle,
  .chain-hero .reveal > p,
  .chain-alert,
  .chain-hero-list {
    max-width: calc(100vw - 3rem);
    overflow-wrap: break-word;
  }

  .chain-choice-grid,
  .chain-how-grid,
  .chain-related-grid,
  .chain-input-row {
    grid-template-columns: 1fr;
  }

  .chain-calculator-title,
  .estimate-head,
  .estimate-total,
  .chain-budget-line {
    align-items: start;
    flex-direction: column;
  }

  .chain-material-row,
  .breakdown-row {
    grid-template-columns: 1fr;
  }

  .chain-preview-stage {
    min-height: 220px;
  }

  .chain-page .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .chain-page .hero-actions a,
  .chain-action {
    justify-content: center;
    width: 100%;
  }
}