/* =========================================================================
   WTP CARIN LIMITED — Design system
   Concept: clean-energy infrastructure. Engineered, grounded, measured.
   Palette: steel + concrete + paper, with a biogas-amber spark and a
   deep petrol-teal for trust. Data/labels set in mono to encode the
   measurement nature of the business.
   ========================================================================= */

/* ----- Fonts ----- */
@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800;900&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

/* ----- Tokens ----- */
:root{
  --steel:#13191d;
  --steel-2:#1c252b;
  --steel-3:#28343b;
  --paper:#fbfbf9;
  --concrete:#e7eae6;
  --concrete-2:#dde1dc;
  --biogas:#e89126;
  --biogas-soft:#f4b25e;
  --petrol:#0e4f4c;
  --petrol-2:#0a3b39;
  --petrol-soft:#1d6a66;
  --slate:#56655f;
  --ink:#10161a;

  --line:rgba(16,22,26,.12);
  --line-2:rgba(16,22,26,.07);
  --line-dark:rgba(255,255,255,.14);
  --line-dark-2:rgba(255,255,255,.07);

  --font-display:"Archivo",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-body:"IBM Plex Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  --maxw:1180px;
  --gutter:clamp(1.25rem,5vw,4rem);
  --radius:3px;

  --shadow:0 1px 2px rgba(16,22,26,.04),0 8px 28px rgba(16,22,26,.06);
  --shadow-lg:0 2px 4px rgba(16,22,26,.05),0 22px 50px rgba(16,22,26,.12);
}

/* ----- Reset ----- */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  overflow-x:hidden;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  font-size:1.0625rem;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;display:block;}
a{color:var(--petrol);text-decoration:none;}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:800;line-height:1.02;letter-spacing:-.02em;color:var(--ink);}
p{margin:0;}
ul{margin:0;}

/* ----- Layout helpers ----- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);}
.section{padding-block:clamp(2.4rem,4.5vw,4.25rem);}
.section--tight{padding-block:clamp(1.8rem,3.5vw,3rem);}
.section--concrete{background:var(--concrete);}
.section--steel{background:var(--steel);color:#eef1ef;}
.section--petrol{background:var(--petrol);color:#eaf3f1;}
.section--steel h1,.section--steel h2,.section--steel h3,
.section--petrol h1,.section--petrol h2,.section--petrol h3{color:#fff;}

/* ----- Eyebrow (recurring structural device: a measured "tick" + label) ----- */
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--petrol-soft);
  display:inline-flex;
  align-items:center;
  gap:.7em;
  margin:0 0 1.35rem;
}
.eyebrow::before{content:"";width:1.6rem;height:2px;background:var(--biogas);display:inline-block;}
.section--steel .eyebrow,.section--petrol .eyebrow{color:var(--biogas-soft);}
.section--steel .eyebrow::before,.section--petrol .eyebrow::before{background:var(--biogas);}

/* ----- Type scale ----- */
.display{font-size:clamp(1.9rem,3.5vw,2.9rem);line-height:1.04;letter-spacing:-.02em;font-weight:800;}
.h-xl{font-size:clamp(1.55rem,2.6vw,2.15rem);letter-spacing:-.02em;}
.h-lg{font-size:clamp(1.4rem,2.2vw,1.85rem);letter-spacing:-.015em;}
.h-md{font-size:clamp(1.2rem,2vw,1.45rem);letter-spacing:-.01em;}
.lede{font-size:clamp(1.04rem,1.4vw,1.18rem);line-height:1.55;color:var(--slate);font-weight:400;}
.section--steel .lede,.section--petrol .lede{color:rgba(255,255,255,.74);}
.muted{color:var(--slate);}
.section--steel .muted,.section--petrol .muted{color:rgba(255,255,255,.66);}

/* ----- Buttons ----- */
.btn{
  font-family:var(--font-mono);
  font-size:.82rem;
  font-weight:500;
  letter-spacing:.04em;
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:.95rem 1.5rem;
  border-radius:var(--radius);
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .15s ease,background .2s ease,border-color .2s ease,color .2s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px);}
.btn--solid{background:var(--petrol);color:#fff;}
.btn--solid:hover{background:var(--petrol-2);}
.btn--amber{background:var(--biogas);color:var(--steel);}
.btn--amber:hover{background:var(--biogas-soft);}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--ink);}
.btn--ghost:hover{border-color:var(--ink);}
.section--steel .btn--ghost,.section--petrol .btn--ghost{border-color:var(--line-dark);color:#fff;}
.section--steel .btn--ghost:hover,.section--petrol .btn--ghost:hover{border-color:#fff;}
.btn-row{display:flex;flex-wrap:wrap;gap:.85rem;}

/* arrow that nudges on hover */
.btn .arr{transition:transform .15s ease;}
.btn:hover .arr{transform:translateX(3px);}

/* ===========================================================
   HEADER / NAV
   =========================================================== */
.site-head{
  position:sticky;top:0;z-index:60;
  background:rgba(251,251,249,.86);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  height:74px;
}
.brand{display:inline-flex;align-items:center;gap:.65rem;}
.brand svg{width:30px;height:30px;flex:none;}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:1.18rem;letter-spacing:-.02em;color:var(--ink);line-height:1;}
.brand-name span{color:var(--petrol);}
.brand-sub{display:block;font-family:var(--font-mono);font-size:.55rem;letter-spacing:.28em;color:var(--slate);text-transform:uppercase;margin-top:.28rem;}

.nav-links{display:flex;align-items:center;gap:.35rem;list-style:none;margin:0;padding:0;}
.nav-links a:not(.btn){
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.02em;
  color:var(--slate);
  padding:.55rem .8rem;
  border-radius:var(--radius);
  transition:color .15s ease,background .15s ease;
}
.nav-links a:not(.btn):hover{color:var(--ink);background:var(--concrete);}
.nav-links a.active{color:var(--ink);}
.nav-links a.active::after{content:"";display:block;height:2px;background:var(--biogas);margin-top:3px;border-radius:2px;}
.nav-cta{margin-left:.4rem;}

.nav-toggle{
  display:none;background:none;border:1px solid var(--line);border-radius:var(--radius);
  width:42px;height:42px;cursor:pointer;align-items:center;justify-content:center;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--ink);transition:.2s;position:relative;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}
.nav-open .nav-toggle span{background:transparent;}
.nav-open .nav-toggle span::before{top:0;transform:rotate(45deg);}
.nav-open .nav-toggle span::after{top:0;transform:rotate(-45deg);}

/* ===========================================================
   HERO
   =========================================================== */
.hero{position:relative;overflow:hidden;}
.hero-grid-bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line-2) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line-2) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(120% 90% at 80% 10%,#000 0%,transparent 70%);
  -webkit-mask-image:radial-gradient(120% 90% at 80% 10%,#000 0%,transparent 70%);
}
.hero-inner{position:relative;z-index:1;padding-block:clamp(3rem,6vw,5rem) clamp(2.5rem,5vw,4rem);}
.hero-grid2{display:grid;gap:clamp(2rem,4vw,3.6rem);align-items:center;grid-template-columns:1fr;}
@media(min-width:820px){.hero-grid2{grid-template-columns:1.05fr .95fr;}}
.hero-title{font-family:var(--font-display);font-weight:700;font-size:clamp(1.7rem,2.7vw,2.4rem);line-height:1.07;letter-spacing:-.02em;color:var(--ink);max-width:20ch;}
.hero-copy .lede{max-width:50ch;margin-top:1.3rem;}
.hero-copy .btn-row{margin-top:1.9rem;}
.hero-figure{position:relative;}
.hero-figure svg{width:100%;height:auto;max-width:520px;display:block;margin-inline:auto;}

/* signature: engineered "output readout" strip */
.readout{
  margin-top:clamp(2.5rem,5vw,3.5rem);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  box-shadow:var(--shadow);
  display:grid;
  grid-template-columns:repeat(4,1fr);
}
.readout-head{
  grid-column:1/-1;
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
  padding:.7rem 1.1rem;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--slate);
}
.readout-head .dot{width:7px;height:7px;border-radius:50%;background:var(--biogas);box-shadow:0 0 0 4px rgba(232,145,38,.16);}
.readout-cell{padding:1.15rem 1.1rem;border-right:1px solid var(--line);}
.readout-cell:last-child{border-right:none;}
.readout-cell .k{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);}
.readout-cell .v{font-family:var(--font-display);font-weight:800;font-size:clamp(1.35rem,2.4vw,1.85rem);letter-spacing:-.02em;margin-top:.45rem;color:var(--ink);}
.readout-cell .v em{font-style:normal;color:var(--biogas);}
.readout-cell .u{font-family:var(--font-mono);font-size:.7rem;color:var(--slate);margin-top:.15rem;}

/* page hero (interior pages) */
.phero{padding-block:clamp(2.4rem,5vw,4rem) clamp(1.6rem,3vw,2.4rem);}
.phero h1{max-width:18ch;}
.phero .lede{max-width:56ch;margin-top:1.4rem;}

/* ===========================================================
   STAT BAND (dark)
   =========================================================== */
.stat-band{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(1.5rem,3vw,2.5rem);}
.stat .n{font-family:var(--font-display);font-weight:900;font-size:clamp(2.1rem,4vw,3.1rem);letter-spacing:-.03em;line-height:1;color:#fff;}
.stat .n em{font-style:normal;color:var(--biogas);}
.stat .l{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.05em;color:rgba(255,255,255,.62);margin-top:.7rem;line-height:1.45;}

/* ===========================================================
   GENERIC: section heading block
   =========================================================== */
.head-block{max-width:60ch;}
.head-block .lede{margin-top:1.1rem;}
.head-split{display:grid;grid-template-columns:1fr;gap:1.4rem;align-items:end;}
@media(min-width:820px){
  .head-split{grid-template-columns:1.3fr .9fr;gap:3rem;}
  .head-split .aside{padding-bottom:.4rem;}
}

/* ===========================================================
   CARDS — solutions / generic
   =========================================================== */
.cards{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.8rem 1.7rem;display:flex;flex-direction:column;gap:.85rem;
  transition:transform .18s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--concrete-2);}
.card .idx{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--biogas);}
.card h3{font-size:1.22rem;letter-spacing:-.01em;}
.card p{color:var(--slate);font-size:.98rem;}
.card .ico{width:38px;height:38px;color:var(--petrol);}
.section--steel .card,.section--petrol .card{background:var(--steel-2);border-color:var(--line-dark);}
.section--steel .card p{color:rgba(255,255,255,.66);}
.section--steel .card .ico{color:var(--biogas-soft);}

/* ===========================================================
   PROCESS FLOW (anaerobic digestion) — signature diagram
   =========================================================== */
.flow{display:grid;gap:1rem;grid-template-columns:1fr;counter-reset:step;}
@media(min-width:900px){.flow{grid-template-columns:repeat(4,1fr);align-items:stretch;}}
.flow-step{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem 1.4rem;display:flex;flex-direction:column;gap:.55rem;
}
.flow-step .stage{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--slate);display:flex;gap:.6rem;align-items:center;}
.flow-step .stage b{color:var(--petrol);font-weight:600;}
.flow-step h4{font-size:1.12rem;}
.flow-step p{font-size:.92rem;color:var(--slate);margin-top:.15rem;}
.flow-step .tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.4rem;}
.tag{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.04em;color:var(--petrol);background:rgba(14,79,76,.07);border:1px solid rgba(14,79,76,.16);padding:.22rem .5rem;border-radius:2px;}
.tag--amber{color:var(--biogas-deep,#b5710f);background:rgba(232,145,38,.1);border-color:rgba(232,145,38,.28);color:#9a5e0d;}
/* connector arrow */
.flow-step::after{
  content:"→";position:absolute;font-family:var(--font-mono);color:var(--biogas);font-size:1.2rem;
  right:-1rem;top:50%;transform:translateY(-50%);z-index:2;
}
.flow-step:last-child::after{display:none;}
@media(max-width:899px){
  .flow-step::after{right:50%;top:auto;bottom:-1rem;transform:translateX(50%) rotate(90deg);}
}

/* ===========================================================
   FEATURE ROWS (alternating text blocks) — solutions detail
   =========================================================== */
.feature{display:grid;gap:1.6rem;grid-template-columns:1fr;align-items:center;padding-block:clamp(2.2rem,4vw,3.2rem);}
.feature + .feature{border-top:1px solid var(--line);}
@media(min-width:880px){
  .feature{grid-template-columns:1fr 1fr;gap:clamp(2.5rem,5vw,4.5rem);}
  .feature.flip .feature-media{order:-1;}
}
.feature h3{font-size:clamp(1.5rem,2.6vw,2.05rem);}
.feature .eyebrow{margin-bottom:.9rem;}
.feature p{color:var(--slate);margin-top:1rem;}
.feature ul.ticks{list-style:none;padding:0;margin:1.3rem 0 0;display:grid;gap:.7rem;}
.feature ul.ticks li{position:relative;padding-left:1.7rem;font-size:.98rem;}
.feature ul.ticks li::before{content:"";position:absolute;left:0;top:.55em;width:.7rem;height:.7rem;border:2px solid var(--biogas);border-radius:50%;}
.feature ul.ticks li b{color:var(--ink);}

/* media panel (data card instead of stock photo) */
.feature-media{
  background:var(--steel);color:#eef1ef;border-radius:var(--radius);
  padding:1.9rem;box-shadow:var(--shadow-lg);
}
.feature-media .eyebrow{color:var(--biogas-soft);}
.feature-media .eyebrow::before{background:var(--biogas);}
.metric-list{display:grid;gap:0;margin-top:.4rem;}
.metric-list .row{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;padding:.95rem 0;border-bottom:1px solid var(--line-dark);}
.metric-list .row:last-child{border-bottom:none;}
.metric-list .row .k{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:rgba(255,255,255,.6);text-transform:uppercase;}
.metric-list .row .v{font-family:var(--font-display);font-weight:800;font-size:1.25rem;letter-spacing:-.02em;color:#fff;text-align:right;}
.metric-list .row .v em{font-style:normal;color:var(--biogas);}

/* ===========================================================
   PARTNERS
   =========================================================== */
.partner-grid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}
.partner{
  display:flex;flex-direction:column;gap:.6rem;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:1.6rem;transition:border-color .2s ease,transform .18s ease,box-shadow .2s ease;
}
.partner:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--concrete-2);}
.partner .pname{font-family:var(--font-display);font-weight:800;font-size:1.18rem;letter-spacing:-.01em;}
.partner .ptag{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--biogas-deep,#9a5e0d);color:#9a5e0d;}
.partner p{font-size:.94rem;color:var(--slate);}
.plink{margin-top:auto;font-family:var(--font-mono);font-size:.78rem;color:var(--petrol);display:inline-flex;gap:.4rem;align-items:center;}
.plink .arr{transition:transform .15s ease;}
.partner:hover .plink .arr,.card:hover .plink .arr{transform:translateX(3px);}
/* featured / lead partner */
.partner--lead{grid-column:1/-1;border-color:var(--petrol);border-left-width:4px;background:linear-gradient(180deg,#fff, #fcfdfc);}
@media(min-width:760px){.partner--lead{display:grid;grid-template-columns:1.2fr 1fr;gap:1.4rem 2.4rem;align-items:center;}}
.partner--lead .pflag{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--petrol);display:inline-flex;align-items:center;gap:.45rem;}
.partner--lead .pflag::before{content:"";width:.5rem;height:.5rem;border-radius:50%;background:var(--biogas);display:inline-block;}
.partner--lead .pname{font-size:clamp(1.4rem,2.4vw,1.9rem);}
.partner--lead p{font-size:1rem;}
.pstake{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;color:var(--petrol);display:inline-flex;align-items:center;gap:.42rem;margin-top:.5rem;}
.pstake::before{content:"";width:.42rem;height:.42rem;border-radius:50%;background:var(--biogas);flex:none;}

/* ===========================================================
   PLACEHOLDER GRID (board / team)
   =========================================================== */
.people{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));}
.person{background:#fff;border:1px dashed var(--line);border-radius:var(--radius);padding:1.5rem;text-align:left;}
.person .avatar{
  width:56px;height:56px;border-radius:50%;background:var(--concrete);
  display:flex;align-items:center;justify-content:center;color:var(--slate);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;margin-bottom:1rem;
  overflow:hidden;
}
.person .avatar img{width:100%;height:100%;object-fit:cover;display:block;}
.person .pn{font-family:var(--font-display);font-weight:700;font-size:1.05rem;color:var(--slate);}
.person .pr{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--biogas-deep,#9a5e0d);color:#9a5e0d;text-transform:uppercase;margin-top:.4rem;}
.person .pbio{font-size:.86rem;line-height:1.5;color:var(--slate);margin-top:.85rem;opacity:.85;text-align:justify;}
.people--bio{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));}
.placeholder-note{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.04em;color:var(--slate);
  border-left:2px solid var(--biogas);padding-left:.9rem;margin-top:1.4rem;
}

/* project photo gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:clamp(1rem,2vw,1.4rem);}
.gallery figure{margin:0;border-radius:14px;overflow:hidden;background:var(--concrete);border:1px solid #e2e6e1;}
.gallery img{display:block;width:100%;height:200px;object-fit:cover;background:#dde3dd;}
.gallery figcaption{padding:.85rem 1rem;}
.gallery figcaption b{display:block;font-family:var(--font-display);font-weight:700;font-size:.95rem;color:var(--slate);margin-bottom:.25rem;}
.gallery figcaption span{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:#9a5e0d;text-transform:uppercase;}

/* ===========================================================
   GEOGRAPHY STRIP
   =========================================================== */
.geo{display:flex;flex-wrap:wrap;gap:.6rem;}
.geo .g{font-family:var(--font-mono);font-size:.82rem;letter-spacing:.04em;border:1px solid var(--line-dark);border-radius:40px;padding:.5rem 1.1rem;color:rgba(255,255,255,.85);display:inline-flex;gap:.55rem;align-items:center;}
.geo .g::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--biogas);}

/* ===========================================================
   CTA band
   =========================================================== */
.cta-band{text-align:center;}
.cta-band h2{max-width:20ch;margin-inline:auto;}
.cta-band .lede{max-width:52ch;margin:1.2rem auto 2rem;}
.cta-band .btn-row{justify-content:center;}

/* ===========================================================
   CONTACT
   =========================================================== */
.contact-grid{display:grid;gap:2.5rem;grid-template-columns:1fr;}
@media(min-width:860px){.contact-grid{grid-template-columns:1fr 1fr;gap:clamp(3rem,5vw,5rem);}}
.field{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.2rem;}
.field label{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--slate);}
.field input,.field textarea,.field select{
  font-family:var(--font-body);font-size:1rem;color:var(--ink);
  border:1px solid var(--line);border-radius:var(--radius);padding:.85rem 1rem;background:#fff;
  transition:border-color .15s ease,box-shadow .15s ease;
}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--petrol);box-shadow:0 0 0 3px rgba(14,79,76,.12);
}
.field textarea{resize:vertical;min-height:130px;}
.contact-aside{display:grid;gap:1.4rem;align-content:start;}
.cinfo .ct{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--slate);margin-bottom:.4rem;}
.cinfo .cv{font-size:1.05rem;color:var(--ink);}
.cinfo .cv a{color:var(--petrol);}

/* ===========================================================
   FOOTER
   =========================================================== */
.site-foot{background:var(--steel);color:rgba(255,255,255,.7);padding-block:clamp(3rem,6vw,4.5rem) 2rem;}
.foot-top{display:grid;gap:2.5rem;grid-template-columns:1fr;}
@media(min-width:780px){.foot-top{grid-template-columns:1.6fr 1fr 1fr;gap:2rem;}}
.foot-brand .brand-name{color:#fff;}
.foot-brand p{margin-top:1rem;max-width:38ch;font-size:.95rem;color:rgba(255,255,255,.6);}
.foot-col h4{font-family:var(--font-mono);font-weight:500;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:1rem;}
.foot-col ul{list-style:none;padding:0;display:grid;gap:.6rem;}
.foot-col a{color:rgba(255,255,255,.78);font-size:.95rem;}
.foot-col a:hover{color:var(--biogas-soft);}
.foot-bottom{
  margin-top:clamp(2.5rem,5vw,3.5rem);padding-top:1.6rem;border-top:1px solid var(--line-dark);
  display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;color:rgba(255,255,255,.45);
}
.foot-bottom .arr{color:var(--biogas);}

/* ===========================================================
   DIAGRAMS
   =========================================================== */
/* circular loop */
.cycle-wrap{display:grid;gap:clamp(2rem,4vw,3.5rem);grid-template-columns:1fr;align-items:center;margin-top:clamp(2.2rem,4.5vw,3.4rem);}
@media(min-width:900px){.cycle-wrap{grid-template-columns:1.05fr .95fr;}}
.cycle-svg{width:100%;height:auto;max-width:540px;margin-inline:auto;display:block;}
.cycle-legend{display:grid;gap:1.05rem;}
.cyc-item{display:grid;grid-template-columns:auto 1fr;gap:.95rem;align-items:start;}
.cyc-n{font-family:var(--font-mono);font-size:.76rem;color:var(--biogas);border:1px solid var(--line);border-radius:7px;padding:.28rem .5rem;line-height:1;white-space:nowrap;}
.cyc-item h4{font-size:1.02rem;letter-spacing:-.01em;margin-bottom:.15rem;}
.cyc-item p{font-size:.93rem;color:var(--slate);}
.section--steel .cyc-item p,.section--petrol .cyc-item p{color:rgba(255,255,255,.66);}
.section--steel .cyc-n,.section--petrol .cyc-n{border-color:var(--line-dark);}
/* linear vs circular */
.lc-grid{display:grid;gap:1.1rem;grid-template-columns:1fr;margin-top:clamp(2rem,4vw,3rem);}
@media(min-width:760px){.lc-grid{grid-template-columns:1fr 1fr;}}
.lc-card{border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem 1.5rem 1.4rem;background:#fff;display:flex;flex-direction:column;gap:1rem;}
.lc-card.is-circular{border-color:var(--petrol);border-left-width:4px;}
.lc-tag{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--slate);}
.lc-card.is-circular .lc-tag{color:var(--petrol);}
.lc-card h4{font-size:1.18rem;letter-spacing:-.01em;}
.lc-card p{font-size:.92rem;color:var(--slate);}
.lc-svg{width:100%;height:auto;display:block;}
/* leadership banner */
.lead-svg{width:100%;height:auto;max-width:760px;margin:clamp(2rem,4vw,3rem) auto 0;display:block;}
/* saf banner */
.saf-banner{width:100%;height:auto;display:block;margin-top:clamp(1.6rem,3vw,2.4rem);}

/* ===========================================================
   REVEAL ANIMATION
   =========================================================== */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease;}
.reveal.in{opacity:1;transform:none;}

/* ===========================================================
   RESPONSIVE NAV
   =========================================================== */
@media(max-width:880px){
  .nav-toggle{display:inline-flex;}
  .nav-links{
    position:absolute;top:74px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:.2rem;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:.8rem var(--gutter) 1.3rem;
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.22s ease;
  }
  .nav-open .nav-links{transform:none;opacity:1;pointer-events:auto;}
  .nav-links a{padding:.85rem .4rem;font-size:.95rem;}
  .nav-links a.active::after{display:none;}
  .nav-cta{margin:.5rem 0 0;}
}

/* grids collapse */
@media(max-width:819px){
  .hero-figure{margin-top:.5rem;}
  .hero-figure svg{max-width:440px;}
}
@media(max-width:720px){
  .readout{grid-template-columns:repeat(2,1fr);}
  .readout-cell:nth-child(2n){border-right:none;}
  .readout-cell:nth-child(3),.readout-cell:nth-child(4){border-top:1px solid var(--line);}
  .stat-band{grid-template-columns:repeat(2,1fr);gap:2rem;}
}
@media(max-width:440px){
  .readout{grid-template-columns:1fr;}
  .readout-cell{border-right:none;border-top:1px solid var(--line);}
  .readout-cell:first-of-type{border-top:none;}
  .stat-band{grid-template-columns:1fr;}
}

/* reduced motion */
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
  .reveal{opacity:1;transform:none;}
}

/* focus visibility */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:2px solid var(--biogas);outline-offset:2px;border-radius:2px;
}