:root {
  color-scheme: light;
  --color-bg: #f6f8f4;
  --color-surface: #ffffff;
  --color-ink: #18211c;
  --color-muted: #5e6b62;
  --color-border: #dbe4dc;
  --color-accent: #176b57;
  --color-accent-dark: #0f4f41;
  --color-focus: #b88900;
  --shadow-soft: 0 16px 40px rgba(24, 33, 28, 0.08);
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--color-accent);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.container,
.section {
  width: min(var(--container), calc(100% - 32px));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--color-ink);
  color: #fff;
  border-radius: 6px;
}

.skip-link:focus {
  top: 16px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 248, 244, 0.94);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.site-logo,
.site-footer__brand {
  font-weight: 800;
  letter-spacing: 0;
}

.site-logo {
  flex: 0 0 auto;
}

.nav-toggle {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.nav-toggle__bar {
  width: 18px;
  height: 2px;
  background: currentColor;
}

.site-nav {
  position: absolute;
  inset: 64px 16px auto;
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.site-nav.is-open {
  display: flex;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 6px;
  color: var(--color-muted);
  font-weight: 700;
}

.site-nav a:hover {
  background: #eef4ef;
  color: var(--color-accent);
}

.site-search {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  width: 100%;
  padding: 4px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fbfcfa;
}

.site-search input {
  min-width: 0;
  min-height: 38px;
  border: 0;
  padding: 8px 10px;
  background: transparent;
  color: var(--color-ink);
  font: inherit;
}

.site-search button {
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--color-accent);
  border-radius: 6px;
  background: var(--color-accent);
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.locale-switcher {
  display: block;
}

.locale-switcher select {
  min-height: 40px;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.site-main {
  min-height: 70vh;
}

.breadcrumb {
  padding-top: 16px;
  font-size: 0.9rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--color-muted);
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: #9aa59d;
}

.breadcrumb a {
  color: var(--color-accent);
  font-weight: 700;
}

.section {
  padding-block: 32px;
}

.section + .section {
  padding-top: 18px;
}

.hero {
  display: grid;
  align-items: center;
  min-height: 440px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(2.35rem, 12vw, 4.9rem);
  line-height: 1;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(1.8rem, 8vw, 3rem);
  line-height: 1.08;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
  line-height: 1.2;
}

.hero__text,
.section__heading p,
.tool-card p,
.site-footer p,
.page-intro {
  color: var(--color-muted);
}

.hero__text {
  max-width: 660px;
  margin-bottom: 24px;
  font-size: 1.08rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid var(--color-accent);
  border-radius: 6px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 800;
}

.button:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

.button--secondary {
  background: transparent;
  color: var(--color-accent);
}

.button--secondary:hover {
  background: #eaf3ee;
  color: var(--color-accent-dark);
}

.calculator-actions,
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.calculator-actions .button,
.result-actions .button {
  flex: 1 1 150px;
}

.section__heading {
  max-width: 680px;
  margin-bottom: 22px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.tool-card {
  display: block;
  min-height: 180px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

a.tool-card:hover,
a.tool-card:focus-visible {
  border-color: #b9d5c9;
  background: #eef7f1;
  box-shadow: 0 18px 44px rgba(23, 107, 87, 0.12);
  color: var(--color-ink);
}

.tool-card__label {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.calculator-panel {
  display: grid;
  gap: 18px;
  margin-bottom: 28px;
}

.calculator-form,
.result-card,
.content-section,
.faq-block details,
.link-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
}

.calculator-form {
  display: grid;
  gap: 18px;
  padding: 18px;
}

.form-grid {
  display: grid;
  gap: 14px;
  /* Keep each cell at its own content height so a field with a long unit
     label does not stretch its neighbour into a tall, empty-looking box. */
  align-items: start;
}

.calculator-form label {
  display: grid;
  gap: 7px;
  color: var(--color-ink);
  font-weight: 800;
}

.calculator-form input,
.calculator-form select {
  min-height: 46px;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
  background: #fbfcfa;
  color: var(--color-ink);
  font: inherit;
}

.calculator-form select {
  cursor: pointer;
}

.field-row {
  display: flex;
  min-height: 46px;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fbfcfa;
}

.field-row input {
  width: 100%;
  min-width: 0;
  border: 0;
  padding: 12px;
  background: transparent;
  color: var(--color-ink);
  font: inherit;
}

.field-row input:disabled {
  color: var(--color-muted);
}

.field-row span {
  flex-shrink: 0;
  padding-inline: 10px;
  border-left: 1px solid var(--color-border);
  color: var(--color-muted);
  font-weight: 700;
  /* Keep the unit on one line so long labels (e.g. "lb / 1,000 sq ft",
     "sq ft", "dry qt") never wrap and inflate the field height. The input
     has min-width: 0 and shrinks to make room instead. */
  white-space: nowrap;
  font-size: 0.85rem;
  line-height: 1.2;
  text-align: center;
}

.form-help,
.field-help,
.form-error {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.field-help {
  font-weight: 400;
  line-height: 1.4;
}

.form-error {
  color: #a33b2f;
  font-weight: 800;
}

.result-card {
  padding: 20px;
  box-shadow: var(--shadow-soft);
}

.result-card__header {
  margin-bottom: 12px;
}

.result-card__eyebrow {
  margin-bottom: 6px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.result-card__value {
  margin-bottom: 8px;
  color: var(--color-accent-dark);
  font-size: clamp(2rem, 10vw, 3.3rem);
  font-weight: 800;
  line-height: 1;
}

.result-card__note {
  color: var(--color-muted);
}

.copy-status {
  min-height: 1.4em;
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.result-card__list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.result-card__list div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

.result-card__list dt {
  color: var(--color-muted);
}

.result-card__list dd {
  margin: 0;
  font-weight: 800;
  text-align: right;
}

.result-metrics {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.result-metrics div {
  display: grid;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #f8faf7;
}

.result-metrics span {
  color: var(--color-muted);
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
}

.result-metrics strong {
  color: var(--color-accent-dark);
  font-size: 1.35rem;
  line-height: 1.15;
}

.material-list {
  display: grid;
  gap: 12px;
}

.material-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fbfcfa;
}

.material-row__actions {
  display: flex;
  align-items: end;
  grid-column: 1 / -1;
}

.material-row__actions .button {
  width: 100%;
}

.button--small {
  min-height: 38px;
  padding: 8px 12px;
}

.content-section {
  padding: 20px;
}

.content-section > *:last-child {
  margin-bottom: 0;
}

.content-list {
  margin: 0;
  padding-left: 1.2rem;
}

.content-list li + li {
  margin-top: 8px;
}

.table-wrap {
  overflow-x: auto;
  margin-block: 18px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef4ef;
  font-size: 0.88rem;
}

tr:last-child td {
  border-bottom: 0;
}

.faq-block {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.faq-block details {
  padding: 0;
}

.faq-block summary {
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 800;
}

.faq-block details p {
  padding: 0 16px 16px;
  color: var(--color-muted);
}

.link-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.link-card {
  display: block;
  padding: 18px;
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

a.link-card:hover,
a.link-card:focus-visible {
  border-color: #b9d5c9;
  background: #eef7f1;
  box-shadow: 0 18px 44px rgba(23, 107, 87, 0.12);
  color: var(--color-ink);
}

.link-card__type {
  display: block;
  margin-bottom: 16px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.link-card p {
  color: var(--color-muted);
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.calculator-hub {
  display: grid;
  gap: 34px;
}

.calculator-category {
  display: grid;
  gap: 16px;
}

.calculator-category__header {
  max-width: 720px;
}

.calculator-category__header p {
  color: var(--color-muted);
}

.calculator-link-card {
  display: grid;
  gap: 8px;
}

.keyword-angle {
  display: inline-flex;
  width: fit-content;
  margin-top: 8px;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-muted);
  background: #f7faf7;
  font-size: 0.85rem;
  font-weight: 700;
}

.page-header {
  padding-block: 34px 10px;
}

.page-header + .section {
  padding-top: 18px;
}

.page-header h1 {
  margin-bottom: 12px;
}

.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
  background: #eef3ef;
}

.site-footer__inner {
  display: grid;
  gap: 24px;
  padding-block: 32px;
}

.site-footer__links {
  display: grid;
  gap: 10px;
}

.site-footer__links a {
  color: var(--color-muted);
  font-weight: 700;
}

@media (min-width: 720px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    flex: 1;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-search {
    max-width: clamp(220px, 28vw, 360px);
    margin-right: 8px;
  }

  .locale-switcher select {
    width: auto;
    max-width: 140px;
  }

  .site-nav a {
    padding: 8px 10px;
  }

  .section {
    padding-block: 36px;
  }

  .section + .section {
    padding-top: 20px;
  }

  .page-header {
    padding-block: 36px 12px;
  }

  .page-header + .section {
    padding-top: 20px;
  }

  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .calculator-panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
    align-items: start;
  }

  .form-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .form-grid--calculator {
    grid-template-columns: repeat(2, 1fr);
  }

  .calculator-panel--wide {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.85fr);
  }

  .result-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .material-row {
    grid-template-columns: minmax(150px, 1.1fr) minmax(120px, 0.9fr) minmax(110px, 0.8fr) minmax(120px, 0.8fr);
    align-items: start;
  }

  .material-row label:nth-child(1) {
    grid-column: span 2;
  }

  .material-row label:nth-child(2),
  .material-row label:nth-child(3),
  .material-row label:nth-child(4),
  .material-row label:nth-child(5) {
    grid-column: span 1;
  }

  .material-row label:nth-child(6) {
    grid-column: span 2;
  }

  .material-row__actions {
    grid-column: span 2;
  }

  .material-row__actions .button {
    width: auto;
    min-width: 120px;
  }

  .content-section {
    padding: 28px;
  }

  .link-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }

  .site-footer__links {
    grid-template-columns: repeat(4, auto);
    gap: 18px;
  }
}