/* London Mineral Resources — core-log design system */
:root {
  /* palette */
  --c-shale: #1E2826;
  --c-shale-2: #2A3533;
  --c-limestone: #E3E5DF;
  --c-paper: #EEF0EB;
  --c-haematite: #7B2D24;
  --c-haematite-dk: #62231C;
  --c-ochre: #C9A45C;
  --c-lichen: #505B56;
  --c-rule: #C3C8C0;
  --c-white: #FFFFFF;
  --c-on-dark: #E3E5DF;
  --c-on-dark-muted: #B8BFB9;
  --c-focus: #C9A45C;

  /* lithology fills */
  --l-clay: #9A806B;
  --l-sand: #D6BF86;
  --l-gravel: #8C877B;
  --l-lime: #CBCBBF;
  --l-iron: #7B2D24;
  --l-chem: #58706A;
  --l-ink: rgba(30, 40, 38, 0.42);

  /* type */
  --f-display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --f-body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --fs-small: 0.875rem;
  --fs-body: 1.0625rem;
  --fs-lead: 1.1875rem;
  --fs-h3: 1.375rem;
  --fs-h2: clamp(2rem, 5vw + 0.75rem, 3.5rem);
  --fs-h1: clamp(2.75rem, 8vw + 1rem, 6rem);

  /* spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4.5rem;
  --s-9: 6.5rem;

  /* radii, shadows */
  --r-s: 2px;
  --r-m: 4px;
  --r-core: 1.25rem;
  --sh-core: drop-shadow(0 1rem 1.25rem rgba(30, 40, 38, 0.2));
  --sh-panel: 0 0.75rem 2rem -1rem rgba(0, 0, 0, 0.55);

  /* layout */
  --maxw: 74rem;
  --measure: 36rem;
  --header-h: 4.25rem;
  --core-w: 4.25rem;
  --core-u: 0.95rem;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--s-4)); }
body {
  margin: 0;
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: 1.62;
  color: var(--c-shale);
  background: var(--c-limestone);
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--c-haematite); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--c-haematite-dk); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--c-focus); outline-offset: 3px; border-radius: var(--r-s); }
h1, h2, h3 {
  font-family: var(--f-display);
  font-stretch: 75%;
  font-weight: 760;
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0;
}
p { margin: 0 0 var(--s-4); }
ul, ol { margin: 0; padding: 0; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s-4); }
.skip-link {
  position: absolute; left: var(--s-4); top: var(--s-2); z-index: 100;
  background: var(--c-shale); color: var(--c-on-dark); padding: var(--s-2) var(--s-4);
  transform: translateY(-200%);
}
.skip-link:focus { transform: translateY(0); color: var(--c-on-dark); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--c-limestone);
  border-bottom: 1px solid var(--c-rule);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); gap: var(--s-4); }
.brand { display: flex; align-items: center; gap: var(--s-3); color: var(--c-shale); text-decoration: none; }
.brand:hover { color: var(--c-shale); }
.brand__mark { width: 1.5rem; height: 2rem; flex: none; }
.brand__name { font-family: var(--f-display); font-stretch: 75%; font-weight: 720; font-size: 1.125rem; line-height: 1.05; display: flex; flex-direction: column; }
.brand__name span + span { color: var(--c-haematite); }

.burger {
  width: 2.75rem; height: 2.75rem; border: 1px solid var(--c-shale); border-radius: var(--r-m);
  background: transparent; display: grid; place-content: center; gap: 6px; cursor: pointer; padding: 0;
}
.burger__line { display: block; width: 1.25rem; height: 2px; background: var(--c-shale); transition: transform 0.25s var(--ease); }
.burger[aria-expanded="true"] .burger__line:first-child { transform: translateY(4px) rotate(45deg); }
.burger[aria-expanded="true"] .burger__line:last-child { transform: translateY(-4px) rotate(-45deg); }

.site-nav {
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--c-shale); color: var(--c-on-dark);
  padding: var(--s-4) var(--s-4) var(--s-6);
  opacity: 0; transform: translateY(-0.75rem); pointer-events: none; visibility: hidden;
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0s linear 0.22s;
}
.site-nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; visibility: visible; transition-delay: 0s; }
.site-nav__list { list-style: none; display: grid; gap: var(--s-1); }
.site-nav__list a {
  display: block; padding: var(--s-3) 0; color: var(--c-on-dark); text-decoration: none;
  font-family: var(--f-display); font-stretch: 85%; font-weight: 600; font-size: 1.375rem;
  border-bottom: 1px solid var(--c-shale-2);
}
.site-nav__list a:hover { color: var(--c-ochre); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 3rem;
  padding: var(--s-3) var(--s-5); border-radius: var(--r-m); border: 2px solid var(--c-haematite);
  font-family: var(--f-display); font-stretch: 90%; font-weight: 650; font-size: 1rem; text-decoration: none;
  transition: transform 0.18s var(--ease);
}
.btn:hover { transform: translateY(-2px); text-decoration: none; }
.btn--primary { background: var(--c-haematite); color: var(--c-paper); }
.btn--primary:hover { background: var(--c-haematite-dk); border-color: var(--c-haematite-dk); color: var(--c-paper); }
.btn--ghost { background: transparent; color: var(--c-haematite); }
.btn--ghost:hover { color: var(--c-haematite-dk); }

/* ---------- hero ---------- */
.hero { padding: var(--s-7) 0 var(--s-8); }
.hero__grid { display: grid; gap: var(--s-7); }
.hero__title { font-size: var(--fs-h1); font-weight: 800; max-width: 11ch; }
.hero__lead { font-size: var(--fs-lead); max-width: var(--measure); margin-top: var(--s-5); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin: var(--s-6) 0 var(--s-5); }
.hero__note { font-size: var(--fs-small); color: var(--c-lichen); max-width: var(--measure); margin: 0; }

/* the memorable element: a borehole core log */
.core { margin: 0; position: relative; }
.core__log { list-style: none; position: relative; }
.core__row .core__slice { filter: var(--sh-core); }
.core__log::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: calc(var(--core-w) + var(--s-2)); width: 0.5rem;
  background: repeating-linear-gradient(to bottom, var(--c-lichen) 0 1px, transparent 1px 0.625rem);
  opacity: 0.7;
}
.core__row { display: grid; grid-template-columns: var(--core-w) 1fr; min-height: calc(var(--h) * var(--core-u)); }
.core__row--clay { --h: 3; --i: 0; }
.core__row--sand { --h: 3.75; --i: 1; }
.core__row--gravel { --h: 3; --i: 2; }
.core__row--lime { --h: 5.5; --i: 3; }
.core__row--iron { --h: 4.25; --i: 4; }
.core__row--chem { --h: 3.25; --i: 5; }
.core__slice { position: relative; border-top: 1px solid rgba(30, 40, 38, 0.35); animation: layer-in 0.7s var(--ease) both; animation-delay: calc(var(--i) * 110ms + 150ms); }
.core__slice::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.32) 0%, rgba(255, 255, 255, 0.16) 30%, rgba(255, 255, 255, 0) 55%, rgba(0, 0, 0, 0.34) 100%);
}
.core__row:first-child .core__slice { border-top: 0; border-radius: var(--r-core) var(--r-core) 0 0 / 0.6rem 0.6rem 0 0; }
.core__row:last-child .core__slice { border-radius: 0 0 var(--r-core) var(--r-core) / 0 0 0.6rem 0.6rem; }
.core__label {
  display: flex; align-items: center; padding-left: calc(var(--s-6) + var(--s-2));
  border-top: 1px dashed var(--c-rule); color: var(--c-shale); text-decoration: none;
  font-family: var(--f-display); font-stretch: 80%; font-weight: 650; font-size: 1.0625rem;
  animation: label-in 0.6s var(--ease) both; animation-delay: calc(var(--i) * 110ms + 380ms);
}
.core__row:first-child .core__label { border-top: 0; }
.core__label:hover { color: var(--c-haematite); text-decoration: underline; }
.core__caption { font-size: var(--fs-small); color: var(--c-lichen); margin-top: var(--s-4); max-width: 22rem; }

@keyframes layer-in { from { opacity: 0; transform: translateY(-0.75rem); } to { opacity: 1; transform: translateY(0); } }
@keyframes label-in { from { opacity: 0; transform: translateX(-0.5rem); } to { opacity: 1; transform: translateX(0); } }

/* lithology patterns, after geological log conventions */
.lith--clay { background-color: var(--l-clay); background-image: repeating-linear-gradient(0deg, transparent 0 6px, var(--l-ink) 6px 7px); }
.lith--sand {
  background-color: var(--l-sand);
  background-image: radial-gradient(var(--l-ink) 0.9px, transparent 1.3px), radial-gradient(var(--l-ink) 0.9px, transparent 1.3px);
  background-size: 8px 8px, 8px 8px; background-position: 0 0, 4px 4px;
}
.lith--gravel {
  background-color: var(--l-gravel);
  background-image: radial-gradient(circle, rgba(30, 40, 38, 0.45) 2.4px, transparent 2.9px), radial-gradient(circle, rgba(255, 255, 255, 0.28) 3.2px, transparent 3.7px);
  background-size: 15px 13px, 15px 13px; background-position: 0 0, 7px 6px;
}
.lith--lime {
  background-color: var(--l-lime);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='12'%3E%3Cpath d='M0 .5H24M0 6.5H24M6 .5V6.5M18 6.5V12' stroke='%231E2826' stroke-opacity='.4' fill='none'/%3E%3C/svg%3E");
  background-size: 24px 12px;
}
.lith--iron { background-color: var(--l-iron); background-image: repeating-linear-gradient(45deg, rgba(0, 0, 0, 0.3) 0 2px, transparent 2px 7px), repeating-linear-gradient(-45deg, rgba(201, 164, 92, 0.2) 0 1px, transparent 1px 9px); }
.lith--chem {
  background-color: var(--l-chem);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14'%3E%3Cpath d='M7 1.5L12.5 7L7 12.5L1.5 7Z' stroke='%23E3E5DF' stroke-opacity='.35' fill='none'/%3E%3C/svg%3E");
  background-size: 14px 14px;
}
.lith--other {
  background-color: var(--c-lichen);
  background-image: repeating-linear-gradient(90deg, rgba(227, 229, 223, 0.22) 0 1px, transparent 1px 9px), repeating-linear-gradient(0deg, rgba(227, 229, 223, 0.22) 0 1px, transparent 1px 9px);
}

/* ---------- sections ---------- */
.section { padding: var(--s-8) 0; }
.section--paper { background: var(--c-paper); border-top: 1px solid var(--c-rule); border-bottom: 1px solid var(--c-rule); }
.section__title { font-size: var(--fs-h2); max-width: 16ch; }
.section__intro { font-size: var(--fs-lead); max-width: var(--measure); margin-top: var(--s-5); }

/* services */
.services__body { display: grid; gap: var(--s-7); margin-top: var(--s-7); }
.services__figure { margin: 0; }
.services__img { width: 100%; border: 1px solid var(--c-rule); border-radius: var(--r-m); background: var(--c-white); }
.services__caption { font-size: var(--fs-small); color: var(--c-lichen); margin-top: var(--s-3); }
.service-list { list-style: none; border-top: 2px solid var(--c-shale); }
.service { padding: var(--s-5) 0; border-bottom: 1px solid var(--c-rule); }
.service__title { font-size: var(--fs-h3); margin-bottom: var(--s-2); }
.service p { margin: 0; max-width: var(--measure); }

/* materials */
.materials { list-style: none; display: grid; margin-top: var(--s-7); border-top: 2px solid var(--c-shale); }
.material { display: grid; grid-template-columns: 2.5rem 1fr; gap: var(--s-4); padding: var(--s-5) 0; border-bottom: 1px solid var(--c-rule); }
.material__swatch { border-radius: var(--r-s); min-height: 4.5rem; box-shadow: inset 0 0 0 1px rgba(30, 40, 38, 0.25); }
.material__name { font-size: var(--fs-h3); margin-bottom: var(--s-2); }
.material p { margin: 0; }

/* approach */
.steps { list-style: none; counter-reset: step; display: grid; gap: var(--s-6); margin-top: var(--s-7); }
.step { counter-increment: step; position: relative; padding-left: 4rem; }
.step::before {
  content: counter(step); position: absolute; left: 0; top: -0.2rem;
  font-family: var(--f-display); font-stretch: 75%; font-weight: 800; font-size: 3rem; line-height: 1; color: var(--c-haematite);
}
.step__title { font-size: var(--fs-h3); margin-bottom: var(--s-2); }
.step p { margin: 0; }

/* contact */
.section--contact { background: var(--c-shale); color: var(--c-on-dark); }
.section--contact .section__title { color: var(--c-on-dark); }
.section--contact a { color: var(--c-ochre); }
.section--contact a:hover { color: var(--c-paper); }
.contact__grid { display: grid; gap: var(--s-7); margin-top: var(--s-7); }
.contact__dl { margin: 0; display: grid; gap: var(--s-5); }
.contact__dl dt { font-family: var(--f-display); font-stretch: 85%; font-weight: 600; color: var(--c-on-dark-muted); font-size: var(--fs-small); }
.contact__dl dd { margin: var(--s-1) 0 0; overflow-wrap: anywhere; }

.enquiry { background: var(--c-paper); color: var(--c-shale); padding: var(--s-5); border-radius: var(--r-m); box-shadow: var(--sh-panel); }
.enquiry__grid { display: grid; gap: var(--s-4); }
.field { display: grid; gap: var(--s-1); align-content: start; }
.field label { font-family: var(--f-display); font-stretch: 85%; font-weight: 600; font-size: 0.9375rem; }
.field__hint { font-weight: 400; color: var(--c-lichen); }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; font-size: 1rem; color: var(--c-shale); background: var(--c-white);
  border: 1px solid var(--c-lichen); border-radius: var(--r-s); padding: var(--s-3);
}
.field textarea { min-height: 8rem; resize: vertical; }
.field [aria-invalid="true"] { border-color: var(--c-haematite); box-shadow: inset 0 0 0 1px var(--c-haematite); }
.field__error { font-size: var(--fs-small); color: var(--c-haematite); margin: 0; }
.field__error:empty { display: none; }
.field--check { grid-template-columns: auto 1fr; align-items: start; gap: var(--s-3); }
.field--check input { width: 1.25rem; height: 1.25rem; margin-top: 0.2rem; accent-color: var(--c-haematite); }
.field--check label { font-family: var(--f-body); font-stretch: 100%; font-weight: 400; font-size: 0.9375rem; }
.field--check .field__error { grid-column: 2; }
.section--contact .enquiry a { color: var(--c-haematite); }
.section--contact .enquiry a:hover { color: var(--c-haematite-dk); }
.enquiry__submit { margin-top: var(--s-2); width: 100%; cursor: pointer; }
.enquiry__note { font-size: var(--fs-small); color: var(--c-lichen); margin: var(--s-4) 0 0; }
.enquiry__status {
  margin-top: var(--s-4); padding: var(--s-4); border-left: 4px solid var(--c-haematite);
  background: var(--c-limestone); border-radius: var(--r-s);
}
.enquiry__status p { margin: 0; }
.enquiry__status.is-visible { animation: label-in 0.4s var(--ease) both; }

/* ---------- legal pages ---------- */
.doc { padding: var(--s-7) 0 var(--s-8); }
.doc__title { font-size: var(--fs-h2); max-width: 18ch; }
.doc__meta { color: var(--c-lichen); font-size: var(--fs-small); margin-top: var(--s-4); }
.doc__body { max-width: 42rem; margin-top: var(--s-6); }
.doc__body h2 { font-size: 1.625rem; margin: var(--s-7) 0 var(--s-3); }
.doc__body ul { padding-left: 1.25rem; margin-bottom: var(--s-4); }
.doc__body li { margin-bottom: var(--s-2); }
.notfound { padding: var(--s-9) 0; }
.notfound__code { font-family: var(--f-display); font-stretch: 75%; font-weight: 800; font-size: clamp(5rem, 22vw, 11rem); line-height: 0.9; color: var(--c-haematite); margin: 0 0 var(--s-4); }
.notfound .section__intro { margin-bottom: var(--s-6); }

/* ---------- footer ---------- */
.site-footer { background: var(--c-shale); color: var(--c-on-dark); border-top: 6px solid var(--c-haematite); }
.site-footer .footer__top { display: grid; gap: var(--s-6); padding-top: var(--s-7); padding-bottom: var(--s-6); }
.site-footer .brand { color: var(--c-on-dark); }
.site-footer .brand__name span + span { color: var(--c-ochre); }
.footer__text { color: var(--c-on-dark-muted); margin: var(--s-4) 0 0; max-width: 26rem; }
.footer__nav ul { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-2) var(--s-5); }
.footer__nav a { color: var(--c-on-dark); text-decoration: none; }
.footer__nav a:hover { color: var(--c-ochre); text-decoration: underline; }
.site-footer .footer__legal {
  border-top: 1px solid var(--c-shale-2); padding-top: var(--s-5); padding-bottom: var(--s-6);
  font-size: var(--fs-small); line-height: 1.6; color: var(--c-on-dark-muted);
}
.footer__legal p { margin: 0 0 var(--s-1); overflow-wrap: anywhere; }
.footer__legal a { color: var(--c-on-dark); }
.footer__legal a:hover { color: var(--c-ochre); }
.legal__name { color: var(--c-on-dark); font-weight: 600; }
.legal__links { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-5); margin-top: var(--s-3); }

/* ---------- breakpoints ---------- */
@media (min-width: 480px) {
  .wrap { padding: 0 var(--s-5); }
  .site-nav { padding-left: var(--s-5); padding-right: var(--s-5); }
  .enquiry { padding: var(--s-6); }
  .enquiry__grid--two { grid-template-columns: 1fr 1fr; }
  .enquiry__submit { width: auto; }
  .material { grid-template-columns: 3rem 1fr; }
}

@media (min-width: 768px) {
  :root { --core-u: 1.1rem; --core-w: 5rem; }
  .burger { display: none; }
  .site-nav {
    position: static; opacity: 1; transform: none; pointer-events: auto; visibility: visible;
    background: transparent; color: inherit; padding: 0; transition: none;
  }
  .site-nav__list { display: flex; align-items: center; gap: var(--s-5); }
  .site-nav__list a { border: 0; padding: var(--s-2) 0; font-size: 1rem; color: var(--c-shale); }
  .site-nav__list a:hover { color: var(--c-haematite); }
  .site-nav__list .site-nav__cta { padding: var(--s-2) var(--s-4); border: 2px solid var(--c-haematite); border-radius: var(--r-m); color: var(--c-haematite); }
  .site-nav__list .site-nav__cta:hover { background: var(--c-haematite); color: var(--c-paper); }
  .hero { padding: var(--s-8) 0 var(--s-9); }
  .hero__grid { grid-template-columns: 1.35fr 1fr; align-items: center; }
  .section { padding: var(--s-9) 0; }
  .service { display: grid; grid-template-columns: 13rem 1fr; gap: var(--s-5); }
  .service__title { margin: 0; }
  .materials { grid-template-columns: 1fr 1fr; column-gap: var(--s-7); }
  .steps { grid-template-columns: 1fr 1fr; column-gap: var(--s-7); }
  .contact__grid { grid-template-columns: 1fr 1.4fr; align-items: start; }
  .site-footer .footer__top { grid-template-columns: 1.4fr 1fr; }
}

@media (min-width: 1024px) {
  :root { --core-u: 1.3rem; --core-w: 6rem; }
  .services__head { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-7); align-items: end; }
  .services__head .section__intro { margin: 0; }
  .services__body { grid-template-columns: 1fr 1.25fr; align-items: start; }
  .materials { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(4, 1fr); column-gap: var(--s-6); border-top: 2px solid var(--c-shale); padding-top: var(--s-6); }
  .step { padding-left: 0; padding-top: 3.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .btn:hover { transform: none; }
}