/* ============================================================
   Sustainability Holdings — site stylesheet
   Tokens → base → layout → components → pages → utilities
   ============================================================ */

/* ── Tokens ───────────────────────────────────────────────── */
:root {
  /* light — cool paper with a faint green cast */
  --ground:      #F0F2EE;
  --surface:     #FAFBF8;
  --ink:         #171B18;
  --ink-soft:    #565E58;
  --ink-faint:   #8B948C;
  --rule:        #D2D7CF;
  --rule-soft:   #E2E6DE;
  --accent:      #2F6E58;
  --accent-ink:  #FAFBF8;
  --clay:        #A85436;

  /* the plate is dark in both themes — it is the brand's ground */
  --plate:       #141815;
  --plate-ink:   #EDF0EA;
  --plate-soft:  #9BA69D;
  --plate-rule:  #2E3630;

  --serif: "EB Garamond", Baskerville, "Hoefler Text", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  --measure: 64ch;
  --pad: clamp(1.25rem, 5vw, 5rem);
  --max: 1240px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground:    #131614;
    --surface:   #191E1B;
    --ink:       #E6EAE4;
    --ink-soft:  #98A29A;
    --ink-faint: #6B756D;
    --rule:      #2B322D;
    --rule-soft: #222824;
    --accent:    #7FBEA4;
    --accent-ink:#10130F;
    --clay:      #D08059;
  }
}
:root[data-theme="dark"] {
  --ground:    #131614;
  --surface:   #191E1B;
  --ink:       #E6EAE4;
  --ink-soft:  #98A29A;
  --ink-faint: #6B756D;
  --rule:      #2B322D;
  --rule-soft: #222824;
  --accent:    #7FBEA4;
  --accent-ink:#10130F;
  --clay:      #D08059;
}
:root[data-theme="light"] {
  --ground:    #F0F2EE;
  --surface:   #FAFBF8;
  --ink:       #171B18;
  --ink-soft:  #565E58;
  --ink-faint: #8B948C;
  --rule:      #D2D7CF;
  --rule-soft: #E2E6DE;
  --accent:    #2F6E58;
  --accent-ink:#FAFBF8;
  --clay:      #A85436;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--plate);
  color: var(--plate-ink);
  padding: 0.75rem 1.25rem;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

/* ── Layout ───────────────────────────────────────────────── */
.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { border-top: 1px solid var(--rule); }
.section > .wrap { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.section--tight > .wrap { padding-block: clamp(2.5rem, 5vw, 4rem); }

.section-head {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: clamp(1rem, 4vw, 3rem);
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.section-head h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  line-height: 1.14;
  margin: 0 0 0.6rem;
  text-wrap: balance;
}
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; } }

/* ── Shared type ──────────────────────────────────────────── */
.label {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.display {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 0;
}
.lede { max-width: var(--measure); color: var(--ink-soft); }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.9rem 1.75rem;
  border: 1px solid currentColor;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.btn:hover { background: var(--ink); color: var(--ground); }

.plate .btn,
.hero .btn {
  color: var(--plate-ink);
}
.plate .btn:hover,
.hero .btn:hover {
  background: var(--plate-ink);
  color: var(--plate);
}

/* ── Masthead ─────────────────────────────────────────────── */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--plate);
  color: var(--plate-ink);
  border-bottom: 1px solid var(--plate-rule);
}
.masthead > .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1rem;
}
.wordmark { text-decoration: none; }
.wordmark b {
  display: block;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.375rem;
  letter-spacing: 0.005em;
}
.wordmark span {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.8125rem;
  color: var(--plate-soft);
  letter-spacing: 0.02em;
}

.nav ul {
  display: flex;
  gap: clamp(1rem, 2.2vw, 2.1rem);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
}
.nav a {
  text-decoration: none;
  color: var(--plate-soft);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}
.nav a:hover { color: var(--plate-ink); border-bottom-color: var(--plate-ink); }
.nav a[aria-current="page"] { color: var(--plate-ink); border-bottom-color: var(--plate-ink); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--plate-rule);
  color: var(--plate-ink);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
}

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .nav {
    display: none;
    width: 100%;
    border-top: 1px solid var(--plate-rule);
    margin-top: 1rem;
    padding-top: 1rem;
  }
  .nav[data-open="true"] { display: block; }
  .nav ul { flex-direction: column; gap: 0.9rem; font-size: 1.0625rem; }
  .masthead > .wrap { flex-wrap: wrap; align-items: center; }
}

/* ── Hero plate ───────────────────────────────────────────── */
.hero {
  position: relative;
  background: var(--plate);
  color: var(--plate-ink);
  padding-block: clamp(4rem, 11vw, 8.5rem) 0;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-media::after {
  /* Same plate colour as the rest of the hero, at low opacity — the video
     shows through, the tint keeps it on-brand and keeps text legible. */
  content: "";
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--plate) 62%, transparent);
}
.hero-grid,
.hero > .stripes,
.hero > .stripes-note {
  position: relative;
  z-index: 1;
}
@media (prefers-reduced-motion: reduce) {
  .hero-media video { display: none; }
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: end;
  padding-bottom: clamp(3.5rem, 8vw, 6rem);
}
.hero h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.9rem);
  color: var(--plate-ink);
}
.hero h1 em { font-style: italic; font-weight: 600; }
.hero-aside p {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  line-height: 1.5;
  color: var(--plate-soft);
  margin: 0 0 2rem;
  max-width: 38ch;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; align-items: start; } }

/* Inner-page hero — same plate, shorter */
.hero--page { padding-block: clamp(3rem, 7vw, 5.5rem); }
.hero--page .wrap { display: grid; gap: 1rem; }
.hero--page h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
  max-width: 20ch;
}
.hero--page p {
  margin: 0;
  color: var(--plate-soft);
  max-width: 56ch;
  font-size: 1.0625rem;
}
.hero--page .label { color: var(--plate-soft); }

.crumbs {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--plate-soft);
}
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--plate-ink); }

/* ── Warming stripes band ─────────────────────────────────── */
.stripes { display: flex; height: 44px; width: 100%; }
.stripes i { flex: 1; }
.stripes-note { background: var(--plate); color: var(--plate-soft); }
.stripes-note .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.7rem 1.4rem;
}
.stripes-note .label { color: var(--plate-soft); }
.stripes-note a { text-decoration: none; }
.stripes-note a:hover { color: var(--plate-ink); }

/* ── Record strip ─────────────────────────────────────────── */
.record {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}
.record div {
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 1.4rem 1.5rem 1.6rem;
}
.record b {
  display: block;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 2.1rem;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.35rem;
}
.record p { margin: 0; font-size: 0.875rem; color: var(--ink-soft); line-height: 1.45; }
@media (max-width: 900px) { .record { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .record { grid-template-columns: 1fr; } }

/* ── Ledger rows (services) ───────────────────────────────── */
.ledger { border-top: 1px solid var(--rule); }
.ledger--flush { border-top: 0; }
.row {
  display: grid;
  grid-template-columns: 14rem 1fr 3rem;
  gap: clamp(1rem, 4vw, 3rem);
  align-items: baseline;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
  transition: background .2s;
}
.row:hover { background: var(--surface); }
.row h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  margin: 0;
  line-height: 1.2;
}
.row p { margin: 0; color: var(--ink-soft); font-size: 0.9375rem; max-width: 62ch; }
.row .arrow { justify-self: end; color: var(--ink-faint); transition: transform .2s, color .2s; }
.row:hover .arrow { transform: translateX(4px); color: var(--accent); }
@media (max-width: 760px) {
  .row { grid-template-columns: 1fr; gap: 0.5rem; }
  .row .arrow { display: none; }
}

/* ── Columns (industries, partners, values) ───────────────── */
.cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3.25rem);
}
.cols--2 { grid-template-columns: repeat(2, 1fr); }
.cols--4 { grid-template-columns: repeat(4, 1fr); }
.col { border-top: 2px solid var(--accent); padding-top: 1.1rem; }
.col h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.375rem;
  margin: 0 0 0.6rem;
}
.col p { margin: 0; color: var(--ink-soft); font-size: 0.9375rem; }
@media (max-width: 980px) { .cols--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px) { .cols, .cols--2 { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .cols--4 { grid-template-columns: 1fr; } }

/* ── Insights index ───────────────────────────────────────── */
.index { border-top: 1px solid var(--rule); }
.index--flush { border-top: 0; }
.entry {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: clamp(1rem, 4vw, 3rem);
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
}
.entry time {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  padding-top: 0.35rem;
}
.entry h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
  line-height: 1.22;
  margin: 0 0 0.4rem;
  text-wrap: balance;
  transition: color .18s;
}
.entry:hover h3 { color: var(--accent); }
.entry p { margin: 0; color: var(--ink-soft); font-size: 0.9375rem; max-width: 70ch; }
@media (max-width: 620px) { .entry { grid-template-columns: 1fr; gap: 0.4rem; } }

/* ── Prose (article + long-form pages) ────────────────────── */
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.25rem; }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0; }
.prose h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  line-height: 1.18;
  margin-top: 2.75rem;
  margin-bottom: 0;
  text-wrap: balance;
}
.prose h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.3125rem;
  margin-top: 2rem;
  margin-bottom: 0;
}
.prose ul, .prose ol { margin: 0; padding-left: 1.25rem; color: var(--ink-soft); }
.prose li + li { margin-top: 0.5rem; }
.prose blockquote {
  margin: 2rem 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--accent);
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.45;
  color: var(--ink);
}
.prose a { color: var(--accent); text-underline-offset: 3px; }
.prose strong { font-weight: 600; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

.article-layout {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: clamp(1rem, 4vw, 3rem);
}
.article-meta { display: grid; gap: 0.5rem; align-content: start; }
.article-meta time {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
@media (max-width: 860px) { .article-layout { grid-template-columns: 1fr; } }

/* ── Plate sections (careers / newsletter / CTA) ──────────── */
.plate { background: var(--plate); color: var(--plate-ink); }
.plate > .wrap { padding-block: clamp(3.5rem, 8vw, 6rem); }
.plate-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.plate h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.9rem, 3.8vw, 3rem);
  line-height: 1.1;
  margin: 0.5rem 0 1rem;
  text-wrap: balance;
}
.plate p { color: var(--plate-soft); max-width: 48ch; }
.plate .label { color: var(--plate-soft); }
.actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.75rem; }
@media (max-width: 860px) { .plate-grid { grid-template-columns: 1fr; } }

/* ── Footer ───────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--rule); }
.site-footer > .wrap { padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: clamp(1.75rem, 5vw, 4rem);
}
.foot-grid h4 { margin: 0 0 0.9rem; }
.foot-grid address,
.foot-grid p {
  font-style: normal;
  margin: 0 0 0.75rem;
  color: var(--ink-soft);
  font-size: 0.9375rem;
  line-height: 1.55;
}
.foot-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; font-size: 0.9375rem; }
.foot-links a { text-decoration: none; color: var(--ink-soft); }
.foot-links a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.entity { font-family: var(--sans); font-size: 0.75rem; line-height: 1.7; color: var(--ink-faint); }
.colophon {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule-soft);
}
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .foot-grid { grid-template-columns: 1fr; } }

/* ── Utilities ────────────────────────────────────────────── */
.meta-value { margin: 0; font-size: 0.9375rem; color: var(--ink-soft); }
.article-meta .label + .label,
.article-meta .meta-value + .label { margin-top: 1rem; }
.back-link { text-decoration: none; }
.address-block { font-style: normal; margin: 0.6rem 0 0; color: var(--ink-soft); }
.stack > div > .label + * { margin-top: 0.6rem; }
.h-alt {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.75rem;
  line-height: 1.15;
  margin: 0;
}

.stack { display: grid; gap: 1.25rem; align-content: start; }
.stack--lg { gap: 2.5rem; }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 4.5rem);
  align-items: start;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}