/* GStone Minerals - site styles */
:root {
  --navy: #0B1C3D;
  --navy-2: #13284F;
  --ink: #1B2230;
  --slate: #5E6168;
  --sand: #C4AD86;
  --sand-deep: #A68E66;
  --chalk: #F2F3F1;
  --white: #FFFFFF;
  --line: #D9DBD8;
  --display: "Montserrat", system-ui, sans-serif;
  --body: "Source Sans 3", system-ui, sans-serif;
  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  font: 400 1.0625rem/1.6 var(--body);
  color: var(--ink);
  background: var(--chalk);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; margin: 0 0 .6em; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); font-weight: 800; color: var(--navy); }
h3 { font-size: 1.125rem; font-weight: 700; }
p { margin: 0 0 1em; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--white); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--sand); outline-offset: 3px; }

/* Buttons */
.btn {
  display: inline-block; font: 700 .95rem/1 var(--display); text-decoration: none;
  padding: 15px 22px; border-radius: 3px; border: 2px solid transparent; cursor: pointer;
  transition: background-color .15s, color .15s, border-color .15s;
}
.btn-sand { background: var(--sand); color: var(--navy); }
.btn-sand:hover { background: #D4BF9A; }
.btn-ghost { border-color: rgba(255,255,255,.4); color: var(--white); }
.btn-ghost:hover { border-color: var(--white); }
.btn-navy { background: var(--navy); color: var(--white); }
.btn-navy:hover { background: var(--navy-2); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(242,243,241,.96); backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 44px; }
.brand-text { display: flex; flex-direction: column; line-height: 1; font-family: var(--display); }
.brand-text strong { font-size: 1.25rem; font-weight: 800; color: var(--navy); letter-spacing: .02em; }
.brand-text small { font-size: .72rem; font-weight: 500; color: var(--slate); letter-spacing: .28em; margin-top: 3px; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { font: 600 .92rem var(--display); text-decoration: none; color: var(--ink); }
.nav a:hover { color: var(--sand-deep); }
.nav .nav-cta { background: var(--navy); color: var(--white); padding: 10px 16px; border-radius: 3px; }
.nav .nav-cta:hover { background: var(--navy-2); color: var(--white); }
.nav-toggle { display: none; font: 700 .9rem var(--display); background: none; border: 2px solid var(--navy); color: var(--navy); padding: 8px 14px; border-radius: 3px; }

/* Hero */
.hero { background: var(--navy); color: var(--white); overflow: hidden; }
.hero-copy { padding-top: clamp(56px, 9vw, 112px); padding-bottom: clamp(48px, 7vw, 88px); }
.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.6rem); font-weight: 800; max-width: 19ch;
  letter-spacing: -0.02em; margin-bottom: .5em;
}
.lede { font-size: clamp(1.05rem, 1.5vw, 1.25rem); max-width: 60ch; color: #C9D0DD; margin-bottom: 2em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* The strata cross-section */
.strata { display: flex; flex-direction: column; height: clamp(420px, 58vh, 620px); position: relative; }
.layer {
  position: relative; flex: 0 0 var(--h);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px var(--gutter) 0;
  margin-top: -16px;
  text-decoration: none; color: var(--ink);
  clip-path: var(--edge);
  transition: filter .2s;
}
.layer:first-child { margin-top: 0; }
.layer:last-child { flex: 1 1 auto; }
.layer:hover, .layer:focus-visible { filter: brightness(1.08); }
.layer:focus-visible { outline: none; }
.layer:focus-visible .layer-name { text-decoration: underline; text-underline-offset: 4px; }
.layer-name { font: 700 clamp(.95rem, 1.6vw, 1.2rem) var(--display); }
.layer-formula { font: 400 clamp(.85rem, 1.3vw, 1rem) var(--body); opacity: .75; }

/* Irregular bedding planes, one per layer */
.strata .layer:nth-child(1) { --edge: polygon(0 10px, 8% 0, 22% 8px, 37% 2px, 55% 12px, 71% 4px, 86% 11px, 100% 3px, 100% 100%, 0 100%); }
.strata .layer:nth-child(2) { --edge: polygon(0 4px, 12% 13px, 27% 5px, 44% 15px, 60% 6px, 78% 14px, 92% 4px, 100% 10px, 100% 100%, 0 100%); }
.strata .layer:nth-child(3) { --edge: polygon(0 12px, 15% 3px, 30% 14px, 47% 6px, 63% 16px, 80% 5px, 100% 13px, 100% 100%, 0 100%); }
.strata .layer:nth-child(4) { --edge: polygon(0 6px, 10% 15px, 24% 6px, 41% 14px, 58% 3px, 74% 12px, 90% 6px, 100% 14px, 100% 100%, 0 100%); }
.strata .layer:nth-child(5) { --edge: polygon(0 14px, 9% 4px, 26% 12px, 39% 2px, 57% 13px, 69% 5px, 85% 15px, 100% 6px, 100% 100%, 0 100%); }
.strata .layer:nth-child(6) { --edge: polygon(0 5px, 14% 14px, 31% 4px, 49% 15px, 66% 6px, 83% 13px, 100% 4px, 100% 100%, 0 100%); }

/* Rock textures, shared by hero layers and spec swatches */
.l-lime {
  background-color: #DAD6C9;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(120,110,90,.22) 0 2px, transparent 3px),
    radial-gradient(ellipse at 70% 60%, rgba(255,255,255,.35) 0 3px, transparent 4px),
    radial-gradient(circle at 45% 80%, rgba(120,110,90,.15) 0 1.5px, transparent 2.5px);
  background-size: 46px 38px, 61px 47px, 29px 33px;
}
.l-gyp {
  background-color: #EEECE6;
  background-image:
    repeating-linear-gradient(112deg, rgba(160,160,150,.16) 0 1px, transparent 1px 13px),
    repeating-linear-gradient(68deg, rgba(255,255,255,.7) 0 2px, transparent 2px 23px);
}
.l-dolo {
  background-color: #C8BAB0;
  background-image:
    radial-gradient(circle, rgba(90,70,60,.22) 0 1.2px, transparent 2px),
    radial-gradient(circle, rgba(255,250,245,.4) 0 1.5px, transparent 2.5px);
  background-size: 9px 11px, 17px 13px;
  background-position: 0 0, 5px 4px;
}
.l-sand {
  background-color: #CDB48A;
  background-image:
    radial-gradient(circle, rgba(120,90,50,.28) 0 .8px, transparent 1.3px),
    radial-gradient(circle, rgba(255,240,210,.45) 0 .8px, transparent 1.4px);
  background-size: 5px 5px, 7px 6px;
  background-position: 0 0, 2px 3px;
}
.l-agg {
  background-color: #8C8D8B;
  background-image:
    radial-gradient(ellipse 9px 6px at 30% 40%, #6E706F 98%, transparent),
    radial-gradient(ellipse 7px 8px at 70% 70%, #A3A4A1 98%, transparent),
    radial-gradient(ellipse 11px 7px at 60% 20%, #7A7B79 98%, transparent);
  background-size: 34px 26px, 27px 31px, 41px 36px;
  color: var(--white);
}
.l-gab {
  background-color: #2C3135;
  background-image:
    radial-gradient(circle, rgba(225,225,215,.55) 0 1px, transparent 1.6px),
    radial-gradient(circle, rgba(15,15,15,.8) 0 1.5px, transparent 2.2px),
    radial-gradient(circle, rgba(180,185,180,.35) 0 1.2px, transparent 2px);
  background-size: 11px 9px, 7px 8px, 15px 13px;
  background-position: 0 0, 3px 4px, 6px 2px;
  color: var(--white);
}
.l-agg .layer-formula, .l-gab .layer-formula { opacity: .85; }

/* Sections */
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section-head { max-width: 680px; margin-bottom: clamp(32px, 5vw, 56px); }
.section-head p { color: var(--slate); font-size: 1.1rem; }

/* Materials spec list */
.materials { background: var(--white); }
.spec-list { border-top: 2px solid var(--navy); }
.spec {
  display: grid; grid-template-columns: 72px minmax(0, 1.1fr) minmax(0, 1.4fr);
  gap: 28px; padding: 28px 0; border-bottom: 1px solid var(--line); align-items: start;
}
.swatch { width: 72px; height: 72px; border-radius: 2px; box-shadow: inset 0 0 0 1px rgba(0,0,0,.08); }
.spec-main h3 { font-size: 1.3rem; color: var(--navy); margin-bottom: .35em; }
.spec-main p { color: var(--slate); margin: 0; }
.spec-data { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; }
.spec-data dt { font: 600 .8rem var(--display); color: var(--sand-deep); margin-bottom: 4px; }
.spec-data dd { margin: 0; font-size: .98rem; }
.spec:target { background: linear-gradient(90deg, rgba(196,173,134,.14), transparent 70%); }

/* Process */
.process { background: var(--chalk); }
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 0; }
.steps li { counter-increment: step; padding: 28px 28px 28px 0; border-top: 2px solid var(--navy); margin-right: 28px; }
.steps li::before {
  content: counter(step); display: block; font: 800 2.4rem/1 var(--display); color: var(--sand);
  margin-bottom: 14px;
}
.steps h3 { color: var(--navy); }
.steps p { color: var(--slate); margin: 0; }

/* Shipping */
.shipping { background: var(--navy); color: var(--white); }
.shipping h2 { color: var(--white); }
.shipping .section-head p { color: #C9D0DD; }
.shipping-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 0 64px; }
.shipping-grid .section-head { grid-column: 1 / -1; }
.terms { margin: 0; }
.terms div { display: grid; grid-template-columns: 140px minmax(0,1fr); gap: 16px; padding: 16px 0; border-top: 1px solid rgba(255,255,255,.16); }
.terms dt { font: 600 .9rem var(--display); color: var(--sand); }
.terms dd { margin: 0; color: #E3E7EE; }
.lanes h3 { color: var(--sand); font-size: 1rem; margin-bottom: 16px; }
.lanes ul { list-style: none; margin: 0; padding: 0; }
.lanes li { display: grid; grid-template-columns: auto minmax(40px,1fr) auto; align-items: center; gap: 14px; padding: 13px 0; border-top: 1px solid rgba(255,255,255,.16); }
.lanes li span:first-child { color: #9AA6BC; font-size: .95rem; }
.lanes li span:last-child { font: 700 1.05rem var(--display); text-align: right; }
.lanes i { height: 2px; background: repeating-linear-gradient(90deg, var(--sand) 0 8px, transparent 8px 14px); position: relative; }
.lanes i::after { content: ""; position: absolute; right: -2px; top: -4px; border: 5px solid transparent; border-left: 7px solid var(--sand); border-right: 0; }

/* About */
.about { background: var(--white); }
.about-grid { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: clamp(32px, 6vw, 88px); align-items: start; }
.about-grid > div { max-width: 68ch; }
.about-mark { width: 100%; max-width: 240px; }
.about p { font-size: 1.1rem; }
.facts { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 10px; }
.facts li { padding-left: 18px; border-left: 3px solid var(--sand); color: var(--slate); }
.facts strong { color: var(--navy); font-weight: 600; }

/* Enquiry */
.enquiry { background: var(--chalk); }
.enquiry-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(32px, 6vw, 80px); }
.enquiry-grid > div > p { color: var(--slate); font-size: 1.1rem; max-width: 42ch; }
.contact-block { margin-top: 28px; border-top: 2px solid var(--navy); }
.contact-block p { display: grid; grid-template-columns: 80px 1fr; padding: 12px 0; margin: 0; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 1rem; }
.contact-block span { font: 600 .85rem var(--display); color: var(--sand-deep); padding-top: 2px; }
.contact-block a { text-decoration: none; }
.contact-block .phones { font: inherit; color: var(--ink); padding-top: 0; line-height: 1.7; }
.contact-block a:hover { text-decoration: underline; }
.rfq { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; background: var(--white); padding: clamp(20px, 3vw, 36px); border: 1px solid var(--line); border-top: 4px solid var(--navy); }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font: 600 .85rem var(--display); color: var(--navy); }
.field input, .field select, .field textarea {
  font: 400 1rem var(--body); color: var(--ink); background: var(--chalk);
  border: 1px solid #C8CBC7; border-radius: 2px; padding: 11px 12px; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--navy); box-shadow: 0 0 0 3px rgba(196,173,134,.5); }
.field [aria-invalid="true"] { border-color: #A2372B; }
.rfq .btn { justify-self: start; }
.form-note { grid-column: 1 / -1; font-size: .9rem; color: var(--slate); margin: 0; }
.form-error { grid-column: 1 / -1; color: #A2372B; margin: 0; font-weight: 600; }

/* Footer */
.site-footer { background: #081430; color: #AEB8CA; padding: 48px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center; }
.footer-brand { display: flex; gap: 16px; align-items: center; }
.footer-brand img { width: 56px; }
.footer-brand strong { font-family: var(--display); color: var(--white); letter-spacing: .02em; }
.footer-brand p { margin: 2px 0 0; font-size: .95rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-nav a { text-decoration: none; font-size: .95rem; }
.footer-nav a:hover { color: var(--white); }
.copy { grid-column: 1 / -1; margin: 12px 0 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1); font-size: .85rem; }

/* Responsive */
@media (max-width: 960px) {
  .spec { grid-template-columns: 56px minmax(0,1fr); gap: 16px 20px; }
  .swatch { width: 56px; height: 56px; }
  .spec-data { grid-column: 2; grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .shipping-grid { grid-template-columns: 1fr; }
  .lanes { margin-top: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-mark { max-width: 140px; }
  .enquiry-grid { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .nav-toggle { display: inline-block; }
  .nav {
    position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--chalk); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 20px; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav .nav-cta { margin-top: 14px; text-align: center; border: 0; }
}
@media (max-width: 600px) {
  .spec { grid-template-columns: 1fr; }
  .swatch { width: 100%; height: 14px; }
  .spec-data { grid-column: 1; grid-template-columns: 1fr; gap: 10px; }
  .steps { grid-template-columns: 1fr; }
  .steps li { margin-right: 0; padding-right: 0; }
  .terms div { grid-template-columns: 1fr; gap: 4px; }
  .rfq { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .layer-formula { display: none; }
  .strata { height: 420px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}