/* AB Grain Trading — "Silo strata" design system */

:root {
  /* palette */
  --soil: #2E2118;
  --soil-2: #4A3627;
  --soil-3: #6B5140;
  --wheat: #D6A13A;
  --wheat-light: #E9C46E;
  --leaf: #3E6B3F;
  --leaf-deep: #2F5331;
  --barley: #EDE3C8;
  --straw: #F6EFDC;
  --ink: #2E2118;
  --ink-muted: #5A4838;
  --on-dark: #EDE3C8;
  --on-dark-muted: #CDBFA0;
  --line: rgba(46, 33, 24, 0.22);
  --line-dark: rgba(237, 227, 200, 0.2);
  --error: #9A2E1C;

  /* grain colours */
  --g-wheat: #D6A13A;
  --g-barley: #E3C77E;
  --g-maize: #EDB02A;
  --g-oats: #CDBB94;
  --g-oilseed: #2B2A1F;
  --g-seed: #6F7E43;
  --g-feed: #8A5A33;

  /* type */
  --f-display: "Big Shoulders Display", "Arial Narrow", Impact, sans-serif;
  --f-body: "Libre Franklin", "Helvetica Neue", Arial, sans-serif;

  /* 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;

  /* shape */
  --r-s: 3px;
  --r-m: 8px;
  --r-l: 16px;
  --r-dome: 50% 50% 0 0 / 100% 100% 0 0;

  --shadow-1: 0 1px 0 rgba(46, 33, 24, 0.12), 0 12px 24px -16px rgba(46, 33, 24, 0.5);
  --shadow-silo: inset -18px 0 24px -12px rgba(46, 33, 24, 0.35), inset 12px 0 18px -12px rgba(255, 245, 220, 0.25);

  --wrap: 72rem;
  --header-h: 64px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--s-4)); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--barley);
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3 {
  font-family: var(--f-display);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: 0.005em;
  margin: 0 0 var(--s-4);
}

h2 { font-size: clamp(2.25rem, 7vw, 3.5rem); }
h3 { font-size: 1.6rem; font-weight: 600; line-height: 1.05; margin-bottom: var(--s-2); }

p { margin: 0 0 var(--s-4); max-width: 62ch; }

a { color: var(--leaf-deep); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--leaf); outline-offset: 3px; border-radius: var(--r-s); }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--s-4); }

.skip-link {
  position: absolute; left: var(--s-4); top: var(--s-2); z-index: 100;
  padding: var(--s-2) var(--s-4); background: var(--soil); color: var(--barley);
  border-radius: var(--r-s); transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: var(--s-3) var(--s-5);
  font: 600 1rem/1.2 var(--f-body);
  border-radius: var(--r-s); border: 2px solid transparent;
  text-decoration: none; cursor: pointer;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--leaf-deep); color: #FFFFFF; }
.btn--ghost { color: var(--soil); border-color: var(--soil); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--soil); color: var(--on-dark);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); gap: var(--s-4); }

.brand { display: inline-flex; align-items: center; gap: var(--s-3); color: inherit; text-decoration: none; }
.brand img { width: 34px; height: 34px; background: var(--barley); border-radius: var(--r-s); padding: 3px; }
.brand__name { font: 800 1.45rem/1 var(--f-display); letter-spacing: 0.01em; }

.burger {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 48px; height: 48px; padding: 0 12px;
  background: transparent; border: 1px solid var(--line-dark); border-radius: var(--r-s); cursor: pointer;
}
.burger__line { display: block; height: 2px; background: var(--on-dark); transition: transform 0.25s var(--ease), opacity 0.2s; }
.burger[aria-expanded="true"] .burger__line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] .burger__line:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] .burger__line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--soil); border-top: 1px solid var(--line-dark);
  opacity: 0; transform: translateY(-8px); visibility: hidden;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0s linear 0.2s;
}
.site-nav.is-open { opacity: 1; transform: none; visibility: visible; transition-delay: 0s; }
.site-nav__list { list-style: none; margin: 0; padding: var(--s-2) var(--s-4) var(--s-5); }
.site-nav__list a {
  display: block; padding: var(--s-3) 0; color: var(--on-dark);
  text-decoration: none; font-weight: 500; border-bottom: 1px solid var(--line-dark);
}
.site-nav__list a:hover { color: var(--wheat-light); }
.site-nav__list .site-nav__cta { color: var(--wheat-light); border-bottom: 0; }

/* ---------- hero ---------- */
.hero { padding-top: var(--s-7); overflow: hidden; }
.hero__grid { display: grid; gap: var(--s-7); align-items: end; }
.hero__copy { padding-bottom: var(--s-2); }
.hero__title { font-size: clamp(2.6rem, 11vw, 5.4rem); max-width: 14ch; margin-bottom: var(--s-5); }
.hero__lead { font-size: 1.075rem; color: var(--ink-muted); max-width: 52ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-5); }

/* the silo — signature element */
.silo { position: relative; width: min(100%, 300px); margin: 0 auto; padding-right: 26px; }
.silo__roof {
  height: 64px; background: var(--soil); border-radius: var(--r-dome);
  box-shadow: var(--shadow-silo);
}
.silo__body {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; height: 360px;
  border: 6px solid var(--soil); border-top-width: 4px; border-bottom: 0;
  background: var(--straw); overflow: hidden;
  box-shadow: var(--shadow-silo);
}
.silo__head { flex: 0.9 1 0; }
.band {
  position: relative; display: flex; align-items: center;
  padding: 0 var(--s-4); border-top: 2px solid rgba(46, 33, 24, 0.28);
  box-shadow: var(--shadow-silo);
  animation: settle 0.7s var(--ease) both;
}
.band span { font: 600 1.05rem/1 var(--f-display); letter-spacing: 0.02em; color: var(--soil); }
.grain--feed.band { flex: 1 1 0; }
.grain--seed.band { flex: 0.7 1 0; }
.grain--oilseed.band { flex: 0.8 1 0; }
.grain--oats.band { flex: 0.9 1 0; }
.grain--maize.band { flex: 1.1 1 0; }
.grain--barley.band { flex: 1.2 1 0; }
.grain--wheat.band { flex: 1.5 1 0; }
.grain--oilseed.band span,
.grain--seed.band span,
.grain--feed.band span { color: var(--barley); }

/* pour from the bottom up */
.band:nth-child(8) { animation-delay: 0.1s; }
.band:nth-child(7) { animation-delay: 0.22s; }
.band:nth-child(6) { animation-delay: 0.34s; }
.band:nth-child(5) { animation-delay: 0.46s; }
.band:nth-child(4) { animation-delay: 0.58s; }
.band:nth-child(3) { animation-delay: 0.7s; }
.band:nth-child(2) { animation-delay: 0.82s; }

@keyframes settle {
  from { opacity: 0; transform: translateY(-60px); }
  to { opacity: 1; transform: none; }
}

.silo__ladder {
  position: absolute; right: 4px; top: 40px; bottom: 0; width: 16px;
  border-left: 3px solid var(--soil); border-right: 3px solid var(--soil);
  background-image: repeating-linear-gradient(to bottom, transparent 0 14px, var(--soil) 14px 17px);
}

.ground { height: 22px; background: var(--soil); position: relative; }
.ground::after {
  content: ""; position: absolute; inset: 0;
  background-image: repeating-linear-gradient(90deg, transparent 0 22px, rgba(237, 227, 200, 0.12) 22px 24px);
}

/* shared grain textures: base colour + speckled kernels */
.grain { background-color: var(--g-wheat); }
.grain--wheat {
  background-color: var(--g-wheat);
  background-image: radial-gradient(ellipse 2px 3px, rgba(122, 78, 18, 0.45) 60%, transparent 70%);
  background-size: 9px 8px;
}
.grain--barley {
  background-color: var(--g-barley);
  background-image: radial-gradient(ellipse 2px 3.5px, rgba(140, 100, 40, 0.4) 60%, transparent 70%);
  background-size: 10px 9px;
}
.grain--maize {
  background-color: var(--g-maize);
  background-image: radial-gradient(circle, rgba(180, 90, 10, 0.4) 2px, transparent 2.6px);
  background-size: 11px 10px;
}
.grain--oats {
  background-color: var(--g-oats);
  background-image: repeating-linear-gradient(60deg, transparent 0 6px, rgba(110, 90, 50, 0.28) 6px 7px);
}
.grain--oilseed {
  background-color: var(--g-oilseed);
  background-image: radial-gradient(circle, rgba(237, 227, 200, 0.22) 1px, transparent 1.6px);
  background-size: 5px 5px;
}
.grain--seed {
  background-color: var(--g-seed);
  background-image: radial-gradient(circle, rgba(237, 227, 200, 0.25) 1.4px, transparent 2px);
  background-size: 8px 7px;
}
.grain--feed {
  background-color: var(--g-feed);
  background-image: repeating-linear-gradient(0deg, transparent 0 5px, rgba(46, 33, 24, 0.3) 5px 6px),
    repeating-linear-gradient(90deg, transparent 0 10px, rgba(46, 33, 24, 0.25) 10px 11px);
}

/* ---------- sections ---------- */
.section { padding: var(--s-8) 0; }
.section__intro { margin-bottom: var(--s-6); }
.section__intro p { color: var(--ink-muted); font-size: 1.05rem; }

/* commodities */
.commodities { list-style: none; margin: 0; padding: 0; display: grid; border-top: 2px solid var(--soil); }
.commodity {
  display: grid; grid-template-columns: 56px 1fr; gap: var(--s-4); align-items: start;
  padding: var(--s-5) 0; border-bottom: 1px solid var(--line);
}
.commodity__swatch { width: 56px; height: 56px; border-radius: var(--r-m); box-shadow: inset 0 0 0 2px rgba(46, 33, 24, 0.25); }
.commodity p { margin: 0; color: var(--ink-muted); }

/* process */
.process { background: var(--soil); color: var(--on-dark); }
.process h2 { color: var(--wheat-light); }
.process__intro p { color: var(--on-dark-muted); }
.process__grid { display: grid; gap: var(--s-6); }
.furrows {
  height: 140px; margin-top: var(--s-5); border-radius: var(--r-l);
  background-color: var(--soil-2);
  background-image:
    repeating-linear-gradient(-18deg, transparent 0 16px, rgba(214, 161, 58, 0.55) 16px 19px, transparent 19px 26px),
    linear-gradient(180deg, rgba(62, 107, 63, 0.35), rgba(46, 33, 24, 0));
}
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.step {
  counter-increment: step; position: relative;
  padding: var(--s-5) 0 var(--s-5) 4rem; border-top: 1px solid var(--line-dark);
}
.step::before {
  content: counter(step);
  position: absolute; left: 0; top: var(--s-5);
  font: 800 2.75rem/0.9 var(--f-display); color: var(--wheat);
}
.step h3 { color: var(--barley); }
.step p { margin: 0; color: var(--on-dark-muted); }

/* partners */
.partners__grid { display: grid; gap: var(--s-4); }
.side { padding: var(--s-6) var(--s-5); border-radius: var(--r-l); }
.side p { margin: 0; }
.side--sell { background: var(--straw); border: 2px solid var(--soil); }
.side--buy { background: var(--leaf-deep); color: var(--straw); }
.side--buy h3 { color: var(--wheat-light); }

/* contact */
.contact { background: var(--straw); border-top: 2px solid var(--soil); }
.contact__grid { display: grid; gap: var(--s-7); }
.contact__info p { color: var(--ink-muted); }
.contact__list { margin: var(--s-5) 0 0; display: grid; gap: var(--s-4); }
.contact__list dt { font-weight: 600; font-size: 0.9rem; color: var(--ink-muted); }
.contact__list dd { margin: 0; overflow-wrap: anywhere; }

.enquiry {
  display: grid; gap: var(--s-4);
  background: #FFFDF7; padding: var(--s-5); border-radius: var(--r-m);
  border: 1px solid var(--line); box-shadow: var(--shadow-1);
}
.enquiry__side { border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: center; }
.enquiry__side legend { font-weight: 600; float: left; margin-right: var(--s-3); padding: 0; }
.choice { position: relative; cursor: pointer; }
.choice input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.choice span {
  display: inline-block; padding: var(--s-2) var(--s-5); min-height: 44px; line-height: 28px;
  border: 2px solid var(--soil); border-radius: var(--r-s); font-weight: 600;
}
.choice input:checked + span { background: var(--soil); color: var(--barley); }
.choice input:focus-visible + span { outline: 3px solid var(--leaf); outline-offset: 3px; }

.field { display: grid; gap: var(--s-1); }
.field label { font-weight: 600; font-size: 0.95rem; }
.field input,
.field select,
.field textarea {
  width: 100%; font: 400 1rem/1.4 var(--f-body); color: var(--ink);
  background: #FFFFFF; border: 1.5px solid var(--soil-3); border-radius: var(--r-s);
  padding: var(--s-3); min-height: 48px;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder,
.field textarea::placeholder { color: #7A6A58; }
.field input:focus-visible,
.field select:focus-visible,
.field textarea:focus-visible { outline: 3px solid var(--leaf); outline-offset: 1px; border-color: var(--leaf-deep); }
.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea { border-color: var(--error); }
.field__error { margin: 0; color: var(--error); font-size: 0.9rem; font-weight: 500; }
.enquiry__submit { justify-self: start; }

.enquiry__done {
  padding: var(--s-5); border-radius: var(--r-m); background: var(--barley);
  border-left: 6px solid var(--leaf); animation: appear 0.35s var(--ease) both;
}
.enquiry__done:focus { outline: none; }
.enquiry__done p { color: var(--ink-muted); }
@keyframes appear { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- document pages ---------- */
.doc { padding: var(--s-8) 0; }
.doc__inner { max-width: 46rem; }
.doc h1 { font-size: clamp(2.5rem, 9vw, 4.25rem); }
.doc__updated { color: var(--ink-muted); font-weight: 500; margin-bottom: var(--s-6); }
.doc h2 { font-size: clamp(1.75rem, 5vw, 2.25rem); margin-top: var(--s-7); padding-top: var(--s-4); border-top: 2px solid var(--soil); }
.doc ul { padding-left: 1.25rem; margin: 0 0 var(--s-4); max-width: 62ch; }
.doc li { margin-bottom: var(--s-2); }
.doc address { font-style: normal; margin-bottom: var(--s-4); }

.notfound { padding: var(--s-8) 0 var(--s-9); }
.notfound h1 { font-size: clamp(2.6rem, 10vw, 5rem); max-width: 14ch; }
.notfound__silo { width: 120px; height: 120px; border-radius: var(--r-dome); margin-bottom: var(--s-5); border: 6px solid var(--soil); background: var(--straw); }

/* ---------- footer ---------- */
.site-footer { background: var(--soil); color: var(--on-dark); padding: var(--s-7) 0 var(--s-6); }
.site-footer a { color: var(--wheat-light); }
.footer__grid { display: grid; gap: var(--s-6); }
.footer__brand p { color: var(--on-dark-muted); margin-top: var(--s-3); font-size: 0.95rem; }
.brand--footer { color: var(--on-dark); }
.brand--footer img { width: 30px; height: 30px; }
.footer__nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-2); }
.footer__nav a { color: var(--on-dark); text-decoration: none; }
.footer__nav a:hover { color: var(--wheat-light); text-decoration: underline; }
.legal {
  font-size: 0.875rem; line-height: 1.55; color: var(--on-dark);
  padding-top: var(--s-5); border-top: 1px solid var(--line-dark);
}
.legal p { margin: 0 0 var(--s-1); overflow-wrap: anywhere; }
.legal__name { font-weight: 600; }
.legal__links { display: flex; flex-wrap: wrap; gap: var(--s-4); margin-top: var(--s-3); }

/* ---------- breakpoints ---------- */
@media (min-width: 480px) {
  .wrap { padding: 0 var(--s-5); }
  .enquiry { grid-template-columns: 1fr 1fr; padding: var(--s-6); }
  .enquiry > * { grid-column: 1 / -1; }
  .enquiry > .field--half { grid-column: auto; }
  .silo { width: 320px; }
}

@media (min-width: 768px) {
  body { font-size: 1.0625rem; }
  .hero { padding-top: var(--s-8); }
  .hero__grid { grid-template-columns: 1.25fr 0.75fr; gap: var(--s-6); }
  .silo { margin: 0 0 0 auto; }
  .silo__body { height: 420px; }
  .commodities { grid-template-columns: 1fr 1fr; column-gap: var(--s-7); }
  .partners__grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); }
  .footer__grid { grid-template-columns: 1.4fr 1fr; }
  .legal { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(2, 1fr); column-gap: var(--s-6); }
  .legal__links { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .burger { display: none; }
  .site-nav {
    position: static; opacity: 1; transform: none; visibility: visible;
    background: transparent; border: 0; transition: none;
  }
  .site-nav__list { display: flex; align-items: center; gap: var(--s-5); padding: 0; }
  .site-nav__list a { border: 0; padding: var(--s-2) 0; }
  .site-nav__list .site-nav__cta {
    padding: var(--s-2) var(--s-4); border: 2px solid var(--wheat); border-radius: var(--r-s);
  }
  .hero__grid { grid-template-columns: 1.3fr 0.7fr; }
  .silo { width: 360px; }
  .silo__roof { height: 78px; }
  .silo__body { height: 470px; }
  .band span { font-size: 1.2rem; }
  .process__grid { grid-template-columns: 0.9fr 1.1fr; gap: var(--s-8); }
  .furrows { height: 220px; }
  .contact__grid { grid-template-columns: 0.8fr 1.2fr; gap: var(--s-8); }
  .footer__grid { grid-template-columns: 1.2fr 0.8fr 2fr; }
  .legal { grid-column: auto; padding-top: 0; border-top: 0; display: block; }
}

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