/* ============================================================
   Zumra Carbon Advisory — Design System
   Palette: white + charcoal + green (ESG consultancy direction)
   Type: IBM Plex Sans (display) + Source Sans 3 (text)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&family=Source+Sans+3:wght@400;500;600&display=swap');

:root{
  /* colour */
  --ink:        #1E2522;
  --ink-70:     #6B7470;
  --forest:     #1F4D3D;
  --forest-dk:  #163A2D;
  --paper:      #FFFFFF;
  --paper-raised:#FFFFFF;
  --tint:       #F4FAF6;
  --light-green:#E8F3EE;
  --stone:      #6B7470;
  --stone-line: #D9E3DD;
  --sage:       #2F6B57;
  --sage-dk:    #1F4D3D;
  --line:       #D9E3DD;

  /* type */
  --font-display: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-text: 'Source Sans 3', -apple-system, sans-serif;

  /* layout */
  --container: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --section-pad: clamp(64px, 8vw, 116px);
  --radius: 3px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1{ font-size: clamp(2.25rem, 1.4rem + 3.2vw, 3.4rem); line-height: 1.08; }
h2{ font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.35rem); }
h3{ font-size: 1.22rem; font-weight: 600; }
h4{ font-size: 1.02rem; font-weight: 600; }

p{ margin: 0 0 1.1em 0; max-width: 62ch; }
p:last-child{ margin-bottom: 0; }

a{ color: inherit; }

.lede{
  font-size: clamp(1.05rem, 0.95rem + 0.4vw, 1.2rem);
  color: var(--ink-70);
  max-width: 58ch;
}

.muted{ color: var(--ink-70); }
.on-dark{ color: var(--paper); }
.on-dark .muted, .on-dark p{ color: #CFE0D6; }
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4{ color: var(--paper); }

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section{ padding: var(--section-pad) 0; }
.section--tight{ padding: clamp(40px,5vw,64px) 0; }
.section--dark{ background: var(--forest); }
.section--raised{ background: var(--tint); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.hr{ border: none; border-top: 1px solid var(--line); margin: 0; }
.on-dark .hr{ border-top-color: rgba(255,255,255,0.18); }

.kicker{
  display:block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--sage-dk);
  margin-bottom: 0.6em;
}
.on-dark .kicker{ color: #94C2A8; }

/* ---------- buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.98rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}
.btn-primary{ background: var(--forest); color: var(--paper); border-color: var(--forest); }
.btn-primary:hover{ background: var(--forest-dk); border-color: var(--forest-dk); }
.btn-secondary{ background: var(--paper); color: var(--sage); border-color: var(--sage); }
.btn-secondary:hover{ background: var(--light-green); color: var(--sage-dk); border-color: var(--sage-dk); }
.on-dark .btn-secondary{ background: transparent; color: var(--paper); border-color: rgba(255,255,255,0.55); }
.on-dark .btn-secondary:hover{ background: var(--paper); color: var(--forest); border-color: var(--paper); }
.on-dark .btn-primary{ background: var(--paper); color: var(--forest-dk); border-color: var(--paper); }
.on-dark .btn-primary:hover{ background: #EAF4EF; }

.btn-row{ display:flex; flex-wrap: wrap; gap: 14px; align-items:center; }

/* ---------- header / nav ---------- */
.site-header{
  position: sticky; top: 0; z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.site-header .container{
  display:flex; align-items:center; justify-content: space-between;
  height: 78px;
}
.logo{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
  display:flex; align-items:center; gap:10px;
}
.logo .mark{
  width: 11px; height: 11px;
  background: var(--sage);
  display:inline-block;
}
.logo .name-sub{ display:block; font-family: var(--font-text); font-weight: 400; font-size: 0.68rem; color: var(--stone); letter-spacing: 0.02em; }

.nav{ display:flex; align-items:center; gap: 34px; }
.nav-links{ display:flex; gap: 30px; list-style:none; margin:0; padding:0; }
.nav-links a{
  text-decoration:none; color: var(--ink-70);
  font-size: 0.97rem; font-weight: 500; font-family: var(--font-display);
  padding: 6px 0; border-bottom: 1px solid transparent;
  transition: color 140ms ease, border-color 140ms ease;
}
.nav-links a:hover{ color: var(--ink); }
.nav-links a.active{ color: var(--ink); border-bottom-color: var(--sage); }

.nav-toggle{
  display:none; background:none; border: 1px solid var(--line); border-radius: var(--radius);
  width: 42px; height: 42px; cursor:pointer; padding: 0;
  align-items:center; justify-content:center;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after{
  content:''; display:block; width: 18px; height: 1.5px; background: var(--ink);
}

@media (max-width: 900px){
  .nav-links{
    position: fixed; inset: 78px 0 0 0; background: var(--paper);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 10px var(--gutter) 30px;
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
    border-top: 1px solid var(--line);
    overflow-y: auto;
  }
  .nav-links.open{ opacity:1; transform: translateY(0); pointer-events:auto; }
  .nav-links li{ width:100%; border-bottom: 1px solid var(--line); }
  .nav-links a{ display:block; padding: 16px 2px; font-size: 1.05rem; }
  .nav-cta{ display:none; }
  .nav-toggle{ display:flex; flex-direction: column; align-items:center; justify-content:center; gap: 4px; }
}
.nav-cta{ }

/* ---------- hero ---------- */
.hero{ padding: clamp(56px,7vw,96px) 0 clamp(48px,6vw,84px); }
.hero-grid{
  display:grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(28px,5vw,72px); align-items:center;
}
.hero-copy h1{ margin-bottom: 0.42em; }
.hero-visual{ width:100%; height:auto; }

@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-visual{ max-width: 320px; margin: 24px auto 0; }
}

/* ---------- generic grids ---------- */
.grid-2{ display:grid; grid-template-columns: 1fr 1fr; gap: clamp(28px,4vw,56px); }
.grid-3{ display:grid; grid-template-columns: repeat(3,1fr); gap: clamp(24px,3vw,40px); }
.grid-4{ display:grid; grid-template-columns: repeat(4,1fr); gap: clamp(22px,3vw,32px); }
.grid-6{ display:grid; grid-template-columns: repeat(3,1fr); gap: 0; }

@media (max-width: 960px){
  .grid-3{ grid-template-columns: 1fr 1fr; }
  .grid-4{ grid-template-columns: 1fr 1fr; }
  .grid-6{ grid-template-columns: 1fr; }
}
@media (max-width: 640px){
  .grid-2, .grid-3, .grid-4{ grid-template-columns: 1fr; }
}

.section-head{ max-width: 640px; margin-bottom: clamp(30px,4vw,52px); }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

/* ---------- service cards (editorial, hairline, no shadow) ---------- */
.service-card{
  border-top: 1px solid var(--line);
  padding: 30px 30px 30px 0;
}
.grid-6 .service-card{ border-right: 1px solid var(--line); padding-right: 28px; }
.grid-6 .service-card:nth-child(3n){ border-right: none; }
@media (max-width: 960px){ .grid-6 .service-card:nth-child(3n){ border-right: 1px solid var(--line); } .grid-6 .service-card:nth-child(2n){ border-right:none; } }
@media (max-width: 640px){ .grid-6 .service-card{ border-right: none !important; padding-right:0; padding-left:0; } }

.service-card h3{ margin-bottom: 10px; }
.service-card .desc{ color: var(--ink-70); margin-bottom: 14px; font-size: 0.98rem; }
.capability-list{
  list-style:none; margin:0; padding:0;
  font-size: 0.9rem; color: var(--ink-70);
}
.capability-list li{
  padding: 6px 0; border-top: 1px solid var(--stone-line);
  display:flex; gap:8px;
}
.capability-list li:first-child{ border-top: none; }
.capability-list li::before{ content:'—'; color: var(--sage-dk); flex: none; }

.card-link{
  display:inline-flex; align-items:center; gap:8px;
  margin-top: 16px; font-family: var(--font-display); font-weight:500; font-size:0.92rem;
  text-decoration:none; color: var(--ink); border-bottom: 1px solid var(--sage);
  padding-bottom: 2px;
}

/* Services grid only: extra breathing room below the top divider (scoped so nothing else on the site is affected) */
.grid-6 .service-card{ padding-top: 46px; padding-left: 28px; }

/* ---------- differentiators ---------- */
.diff-item{ padding-top: 22px; border-top: 1px solid var(--line); }
.diff-item h4{ margin-bottom: 8px; }
.diff-item p{ color: var(--ink-70); font-size: 0.96rem; }

/* ---------- FAQ ---------- */
.faq-item{ padding: 22px 0; border-top: 1px solid var(--line); }
.faq-item:last-child{ padding-bottom: 0; }
.faq-item h4{ margin-bottom: 8px; }
.faq-item p{ color: var(--ink-70); font-size: 0.96rem; }
.faq-item summary{
  cursor:pointer; list-style:none;
  font-family: var(--font-display); font-weight:600; font-size:1rem; color: var(--ink);
  display:flex; justify-content:space-between; align-items:center; gap:20px;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{ content:"+"; font-weight:400; color: var(--sage-dk); font-size:1.3rem; line-height:1; flex-shrink:0; }
.faq-item[open] summary::after{ content:"\2212"; }
.faq-item[open] summary{ margin-bottom:8px; }
.faq-item p{ margin:0; }

/* ---------- process / flow diagram ---------- */
.flow{ display:flex; align-items: stretch; gap: 0; margin-top: 10px; }
.flow-step{
  flex:1; position: relative; padding: 26px 22px 22px;
  border: 1px solid var(--line); border-left: none;
}
.flow-step:first-child{ border-left: 1px solid var(--line); }
.flow-step .num{
  font-family: var(--font-display); font-weight:600; color: var(--sage-dk);
  font-size: 0.85rem; display:block; margin-bottom: 10px;
}
.flow-step h4{ margin-bottom: 8px; }
.flow-step p{ font-size: 0.92rem; color: var(--ink-70); }

@media (max-width: 860px){
  .flow{ flex-direction: column; }
  .flow-step{ border-left: 1px solid var(--line); border-top: none; }
  .flow-step:first-child{ border-top: 1px solid var(--line); }
}

/* simple inline chip-flow, e.g. Scope1 -> Scope2 -> Scope3 */
.chip-flow{ display:flex; flex-wrap:wrap; align-items:center; gap: 10px; margin: 22px 0; }
.chip{
  font-family: var(--font-display); font-weight:500; font-size: 0.92rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 11px 18px; background: var(--paper-raised);
}
.on-dark .chip{ background: transparent; border-color: rgba(255,255,255,0.3); }
.chip-arrow{ color: var(--stone); font-size: 1rem; }

/* ---------- industries / tags ---------- */
.tag-row{ display:flex; flex-wrap:wrap; gap: 10px; margin-top: 18px; }
.tag{
  font-family: var(--font-display); font-size: 0.88rem; font-weight:500;
  border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px;
  color: var(--ink-70);
}

/* ---------- founder ---------- */
.founder{ display:grid; grid-template-columns: 160px 1fr; gap: 34px; align-items:start; }
.monogram{
  width: 120px; height: 120px; border: 1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:600; font-size: 1.7rem; color: var(--sage-dk);
  background: var(--paper-raised);
}
@media (max-width: 640px){ .founder{ grid-template-columns: 1fr; } .monogram{ margin-bottom: 6px; } }

/* ---------- insights ---------- */
.insight-card{ border-top: 1px solid var(--line); padding: 24px 0; }
.insight-card .topic{ font-family: var(--font-display); font-size: 0.82rem; color: var(--sage-dk); font-weight:500; margin-bottom:6px; display:block; }
.insight-card h3{ margin-bottom: 8px; font-size: 1.08rem; }
.insight-card p{ font-size: 0.94rem; color: var(--ink-70); }
.insight-status{ font-size: 0.82rem; color: var(--stone); font-style: italic; }

/* ---------- CTA band ---------- */
.cta-band{ text-align:left; }
.cta-band h2{ max-width: 20ch; }

/* ---------- forms ---------- */
.enquiry-form{ max-width: 640px; }
.form-row{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 640px){ .form-row{ grid-template-columns: 1fr; } }
.field{ margin-bottom: 20px; }
.field label{
  display:block; font-family: var(--font-display); font-weight:500; font-size: 0.9rem;
  margin-bottom: 7px; color: var(--ink);
}
.field .opt{ color: var(--stone); font-weight:400; }
.field input, .field select, .field textarea{
  width:100%; font-family: var(--font-text); font-size: 1rem; color: var(--ink);
  background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px;
}
.field textarea{ min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus{
  outline: 2px solid var(--sage-dk); outline-offset: 1px;
}

/* ---------- footer ---------- */
.site-footer{ background: var(--forest); color: var(--paper); padding: 56px 0 26px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 36px; }
.footer-grid h4{ color: #A9C9B7; font-size: 0.86rem; font-weight:600; margin-bottom: 14px; }
.footer-grid ul{ list-style:none; margin:0; padding:0; }
.footer-grid li{ margin-bottom: 10px; }
.footer-grid a{ text-decoration:none; color: #CFE0D6; font-size:0.95rem; }
.footer-grid a:hover{ color: var(--paper); }
.footer-bottom{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.16);
  font-size: 0.84rem; color: #9FB5A8;
}
@media (max-width: 760px){ .footer-grid{ grid-template-columns: 1fr 1fr; } .footer-grid > div:first-child{ grid-column: 1 / -1; } }
@media (max-width: 500px){ .footer-grid{ grid-template-columns: 1fr; } }

/* ---------- page hero (interior pages) ---------- */
.page-hero{ padding: clamp(52px,6vw,84px) 0 clamp(36px,4vw,52px); }
.page-hero .lede{ margin-top: 14px; }
.page-hero-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items:end; }
@media (max-width: 800px){ .page-hero-grid{ grid-template-columns: 1fr; } }

.definition-list{ display:grid; grid-template-columns: repeat(3,1fr); gap: 0; border-top:1px solid var(--line); margin-top: 28px; }
.definition-list dt{ font-family: var(--font-display); font-weight:600; padding: 20px 22px 6px 22px; }
.definition-list dd{ margin: 0; padding: 0 22px 22px 22px; color: var(--ink-70); font-size:0.95rem; }
.definition-list > div{ border-right: 1px solid var(--line); }
.definition-list > div:last-child{ border-right:none; }
@media (max-width: 760px){ .definition-list{ grid-template-columns: 1fr; } .definition-list > div{ border-right:none; border-bottom:1px solid var(--line); } }

.disclaimer{
  font-size: 0.88rem; color: var(--ink-70); border-left: 2px solid var(--sage);
  padding: 4px 0 4px 18px; margin-top: 28px;
}
.on-dark .disclaimer{ border-left-color: rgba(255,255,255,0.4); color:#CFE0D6; }

.numbered-list{ list-style:none; counter-reset: item; margin:0; padding:0; }
.numbered-list li{
  counter-increment: item; position:relative; padding: 16px 0 16px 40px;
  border-top: 1px solid var(--line);
}
.numbered-list li:first-child{ border-top:none; }
.numbered-list li::before{
  content: counter(item);
  position:absolute; left:0; top:16px;
  font-family: var(--font-display); font-weight:600; color: var(--sage-dk); font-size: 0.9rem;
}
.numbered-list h4{ margin-bottom: 4px; display:inline; }
.numbered-list .stage-body{ display:block; margin-top:4px; color: var(--ink-70); font-size:0.95rem; }

/* misc */
.mt-0{ margin-top:0; } .mb-0{ margin-bottom:0; }
.two-col-text{ display:grid; grid-template-columns: 1fr 1fr; gap: clamp(28px,4vw,64px); }
@media (max-width: 760px){ .two-col-text{ grid-template-columns: 1fr; } }

.skip-link{
  position:absolute; left:-999px; top:auto;
  background: var(--ink); color: var(--paper); padding: 10px 16px; z-index: 200;
}
.skip-link:focus{ left: 12px; top: 12px; }

:focus-visible{ outline: 2px solid var(--sage-dk); outline-offset: 2px; }

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