/*
 * Gravel Calculator theme. One stylesheet, system fonts, no external requests.
 * Colours are checked for WCAG 2.2 AA contrast by tests/theme.
 */

/* ---------- Tokens ---------- */
:root {
  --c-bg: #f7f5f1;
  --c-surface: #ffffff;
  --c-surface-2: #efebe4;
  --c-text: #23201c;
  --c-muted: #574f45;
  --c-line: #d6d0c5;
  --c-control: #8a8378;
  --c-accent: #4d5b2e;
  --c-accent-ink: #ffffff;
  --c-link: #3d5a1f;
  --c-link-hover: #23201c;
  --c-header: #2b2823;
  --c-header-ink: #f7f5f1;
  --c-header-muted: #d9d3c7;
  --c-focus: #1f5fbf;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: clamp(1.375rem, 1.2rem + 0.8vw, 1.625rem);
  --step-3: clamp(1.75rem, 1.4rem + 1.6vw, 2.375rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;

  --radius: 8px;
  --measure: 44rem;
  --wide: 72rem;
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
  overflow-wrap: break-word;
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--c-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--c-link-hover);
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--c-focus);
  outline-offset: 2px;
}

.site-main:focus {
  outline: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  margin: var(--space-5) 0 var(--space-3);
  font-weight: 700;
}

h1 {
  font-size: var(--step-3);
  margin-top: 0;
}

h2 {
  font-size: var(--step-2);
}

h3 {
  font-size: var(--step-1);
}

h4 {
  font-size: var(--step-0);
}

p,
ul,
ol,
dl,
table,
figure,
details,
blockquote {
  margin: 0 0 var(--space-3);
}

ul,
ol {
  padding-left: 1.4em;
}

li + li {
  margin-top: var(--space-1);
}

hr {
  border: 0;
  border-top: 1px solid var(--c-line);
  margin: var(--space-5) 0;
}

.screen-reader-text {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

@media (min-width: 48em) {
  .container {
    padding: 0 var(--space-4);
  }
}

.site-main {
  display: block;
  padding: var(--space-4) 0 var(--space-6);
}

.entry {
  max-width: var(--measure);
}

.entry--home {
  max-width: 52rem;
}

.entry__header {
  margin-bottom: var(--space-4);
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--c-surface);
  color: var(--c-text);
  font-weight: 700;
  border-radius: var(--radius);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

/* ---------- Header and navigation ---------- */
.site-header {
  background: var(--c-header);
  color: var(--c-header-ink);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  min-height: 4rem;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  color: var(--c-header-ink);
  font-size: var(--step-1);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-title:hover {
  color: var(--c-header-ink);
  text-decoration: underline;
}

.site-title__mark {
  width: 1.375rem;
  height: 1.375rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 35%, #c9c1b3 0 18%, transparent 19%),
    radial-gradient(circle at 68% 30%, #9e9585 0 16%, transparent 17%),
    radial-gradient(circle at 50% 70%, #b8ae9d 0 22%, transparent 23%),
    #6f675b;
}

.site-header :focus-visible {
  outline-color: #9cc3ff;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__list li + li {
  margin-top: 0;
}

.site-nav__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-2);
  color: var(--c-header-ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 3px solid transparent;
}

.site-nav__list a:hover,
.site-nav__list a[aria-current="page"],
.site-nav__list .current-menu-item > a,
.site-nav__list .current-menu-ancestor > a {
  color: var(--c-header-ink);
  border-bottom-color: var(--c-header-muted);
}

.site-nav__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--c-header-muted);
  border-radius: var(--radius);
  background: transparent;
  color: var(--c-header-ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.site-nav__toggle[hidden] {
  display: none;
}

.site-nav__icon,
.site-nav__icon::before,
.site-nav__icon::after {
  display: block;
  width: 1.125rem;
  height: 2px;
  background: currentColor;
}

.site-nav__icon {
  position: relative;
}

.site-nav__icon::before,
.site-nav__icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-nav__icon::before {
  top: -6px;
}

.site-nav__icon::after {
  top: 6px;
}

.site-nav.is-open .site-nav__icon {
  background: transparent;
}

.site-nav.is-open .site-nav__icon::before {
  top: 0;
  transform: rotate(45deg);
}

.site-nav.is-open .site-nav__icon::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 47.99em) {
  .site-nav {
    flex-basis: 100%;
  }

  .site-nav.is-collapsible {
    flex-basis: auto;
  }

  .site-nav.is-collapsible .site-nav__menu {
    display: none;
  }

  .site-nav.is-collapsible.is-open {
    flex-basis: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
  }

  .site-nav.is-collapsible.is-open .site-nav__menu {
    display: block;
    width: 100%;
    padding: var(--space-2) 0 var(--space-3);
  }

  .site-nav.is-open .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav.is-open .site-nav__list a {
    display: flex;
    padding: 0 var(--space-2);
    border-bottom: 1px solid #4a4540;
  }
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  margin-bottom: var(--space-3);
  font-size: var(--step--1);
  color: var(--c-muted);
}

.breadcrumbs ol {
  display: block;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li {
  display: inline;
  margin: 0;
}

.breadcrumbs li + li::before {
  content: "/";
  margin: 0 var(--space-2);
  color: var(--c-muted);
}

.breadcrumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--c-link);
}

/* ---------- Content ---------- */
.gdc-byline {
  margin: 0 0 var(--space-4);
  font-size: var(--step--1);
  color: var(--c-muted);
}

.gdc-byline a {
  color: var(--c-link);
}

.entry__content > :first-child {
  margin-top: 0;
}

.entry__content > p:first-child,
.entry--home .entry__content > p:first-of-type {
  font-size: var(--step-1);
  color: var(--c-text);
}

.entry__content .wp-block-table,
.entry__content figure.wp-block-table {
  overflow-x: auto;
}

.entry__content table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-surface);
  font-variant-numeric: tabular-nums;
  font-size: 0.9875rem;
}

.entry__content caption,
.entry__content .wp-element-caption,
.entry__content figcaption {
  margin: var(--space-2) 0;
  font-size: var(--step--1);
  color: var(--c-muted);
  text-align: left;
}

.entry__content th,
.entry__content td {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--c-line);
  text-align: left;
  vertical-align: top;
}

.entry__content thead th {
  background: var(--c-surface-2);
}

.entry__content .has-text-align-right,
.entry__content td.num {
  text-align: right;
}

.entry__content :target {
  scroll-margin-top: var(--space-3);
}

.entry__content tr:target {
  background: #fff4c7;
}

.entry__content blockquote {
  margin-left: 0;
  padding: var(--space-2) var(--space-3);
  border-left: 4px solid var(--c-accent);
  background: var(--c-surface);
}

.entry__content code {
  padding: 0.1em 0.3em;
  border-radius: 4px;
  background: var(--c-surface-2);
  font-size: 0.92em;
}

/* Callout: a core Group block with the class "gdc-note". */
.gdc-note {
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--c-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--c-surface);
}

.gdc-note > :last-child {
  margin-bottom: 0;
}

/* Formula: a core Paragraph or Preformatted block with the class "gdc-formula". */
.gdc-formula {
  padding: var(--space-3);
  border-radius: var(--radius);
  background: var(--c-surface-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  white-space: pre-wrap;
}

/* FAQ: core Details blocks with the class "gdc-faq" (also read by gdc-site for FAQPage schema). */
.entry__content details.gdc-faq {
  margin: 0;
  border-top: 1px solid var(--c-line);
}

.entry__content details.gdc-faq:last-of-type {
  border-bottom: 1px solid var(--c-line);
  margin-bottom: var(--space-4);
}

.entry__content details.gdc-faq > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 44px;
  padding: var(--space-3) 0;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.entry__content details.gdc-faq > summary::-webkit-details-marker {
  display: none;
}

.entry__content details.gdc-faq > summary::after {
  content: "+";
  flex: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--c-accent);
}

.entry__content details.gdc-faq[open] > summary::after {
  content: "–";
}

.entry__content details.gdc-faq > :not(summary) {
  margin-top: 0;
}

/* Buttons (core Buttons block). */
.wp-block-button__link,
.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius);
  background: var(--c-accent);
  color: var(--c-accent-ink);
  font-weight: 700;
  text-decoration: none;
}

.wp-block-button__link:hover,
.button:hover {
  background: var(--c-text);
  color: var(--c-accent-ink);
}

/* ---------- Link cards ---------- */
/* Use on a core List block (class "link-cards"): each item holds a link with <strong> and a line of text. */
.link-cards {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
  margin: var(--space-3) 0 var(--space-4);
  padding: 0;
  list-style: none;
}

.link-cards li {
  margin: 0;
}

.link-cards a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  height: 100%;
  padding: var(--space-3);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
  color: var(--c-text);
  text-decoration: none;
}

.link-cards a strong {
  color: var(--c-link);
  font-size: var(--step-1);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.link-cards a:hover {
  border-color: var(--c-accent);
}

.link-cards a:hover strong {
  text-decoration-thickness: 2px;
}

.link-cards a span,
.link-cards a em {
  color: var(--c-muted);
  font-size: var(--step--1);
  font-style: normal;
}

/* ---------- Related ---------- */
.related {
  max-width: var(--measure);
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-radius: var(--radius);
  background: var(--c-surface-2);
}

.related__title {
  margin: 0 0 var(--space-3);
  font-size: var(--step-1);
}

.related__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.related__list li {
  margin: 0;
}

.related__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: 1px solid var(--c-control);
  border-radius: 999px;
  background: var(--c-surface);
  text-decoration: none;
  font-weight: 600;
}

.related__list a:hover {
  border-color: var(--c-accent);
  text-decoration: underline;
}

/* ---------- Calculators inside content ---------- */
.entry__content .gcalc {
  --gcalc-accent: var(--c-accent);
  --gcalc-text: var(--c-text);
  --gcalc-muted: var(--c-muted);
  --gcalc-focus: var(--c-focus);
  margin: var(--space-4) 0 var(--space-5);
  max-width: none;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--c-line);
  background: var(--c-surface-2);
  font-size: var(--step--1);
  color: var(--c-muted);
}

.site-footer__inner {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-3);
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
}

.site-footer__links li {
  margin: 0;
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 600;
}

.site-footer__note,
.site-footer__copy {
  margin: 0 0 var(--space-2);
}

/* ---------- Motion and print ---------- */
@media (prefers-reduced-motion: no-preference) {
  .skip-link {
    transition: transform 0.15s;
  }
}

@media print {
  .site-header,
  .site-footer,
  .breadcrumbs,
  .related,
  .gcalc-form,
  .gcalc-actions,
  .skip-link {
    display: none !important;
  }

  body {
    background: #fff;
  }

  a {
    color: inherit;
  }
}