/* Bert Energy India – preview 2026-10. All values from BERT-STYLEGUIDE.md (10.10.2026): colours, Poppins, type scale, spacing 4–96, radii 4/8/16.
   Poppins self-hosted (SIL OFL, see fonts/OFL.txt): no request to Google. */
@font-face{font-family:Poppins;font-weight:400;font-display:swap;src:url(fonts/Poppins-Regular.ttf) format('truetype')}
@font-face{font-family:Poppins;font-weight:600;font-display:swap;src:url(fonts/Poppins-SemiBold.ttf) format('truetype')}
@font-face{font-family:Poppins;font-weight:700;font-display:swap;src:url(fonts/Poppins-Bold.ttf) format('truetype')}
:root{--g:#3DA578;--g-hover:#52B98A;--gt:#246B4C;--tint:#E8F4EE;--ink:#1B171B;--mute:#5C5A5E;--soft:#F4F7F5;--line:#D7DDD9;
  --d-surface:#262126;--d-line:#3A353A;--d-mute:#A8A5AA;--font:Poppins,"Segoe UI",Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:400 16px/26px var(--font);color:var(--ink);background:#fff}
a{color:var(--gt)}img{max-width:100%;display:block}
.display{font-size:60px;line-height:66px;font-weight:700;margin:0 0 24px}
h1{font-size:40px;line-height:48px;font-weight:700;margin:0 0 24px}
h2{font-size:32px;line-height:40px;font-weight:600;margin:0 0 16px}
h3{font-size:24px;line-height:32px;font-weight:600;margin:0 0 8px}
h4{font-size:20px;line-height:28px;font-weight:600;margin:0 0 8px}
.hl{color:var(--gt)}
p{color:var(--mute);margin:0 0 16px;max-width:70ch}
.lead{font-size:18px;line-height:30px}
.small,.src{font-size:14px;line-height:22px}.src{color:var(--mute)}
.wrap{max-width:1200px;margin:auto;padding:0 32px}
.section{padding:96px 0}.soft{background:var(--soft)}
.caption{font-size:12px;line-height:16px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--gt)}
.eyebrow{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.eyebrow::before{content:"";width:32px;height:2px;background:var(--g)}
.eyebrow b{color:var(--ink);font-weight:700}

/* Preview badge – remove before go-live */
.draft{position:fixed;right:16px;bottom:16px;z-index:50;background:var(--ink);color:#fff;font-size:12px;line-height:16px;padding:8px 12px;border-radius:4px;border-left:4px solid var(--g)}

/* Header */
.head{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.head .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:80px}
.brand{display:flex;align-items:center;gap:16px;text-decoration:none;color:var(--ink)}
.brand img{width:180px;height:auto}
.brand span{font-size:12px;line-height:16px;font-weight:600;letter-spacing:.08em;border-left:2px solid var(--g);padding-left:12px}
.nav{display:flex;gap:24px;font-size:14px;line-height:22px;font-weight:600}
.nav a{color:var(--ink);text-decoration:none;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current]{border-color:var(--g)}
.menu{display:none}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--g);color:var(--ink);font:600 16px/24px var(--font);padding:12px 24px;border-radius:8px;text-decoration:none;border:0;cursor:pointer}
.btn:hover{background:var(--g-hover)}
.btn-line{background:transparent;border:2px solid var(--ink);padding:10px 22px}.btn-line:hover{background:var(--soft)}
.dark .btn-line,.hero .btn-line{border-color:#fff;color:#fff}.dark .btn-line:hover,.hero .btn-line:hover{background:var(--d-surface)}
a:focus-visible,summary:focus-visible{outline:2px solid var(--gt);outline-offset:2px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}

/* Hero – dark, bottom edge cut at the 36° slant of the logo (the one graphic motif) */
.hero{background:var(--ink);color:#fff;clip-path:polygon(0 0,100% 0,100% 100%,0 calc(100% - 48px))}
.hero .wrap{display:grid;grid-template-columns:7fr 5fr;gap:64px;padding-top:96px;padding-bottom:144px}
.hero h1,.hero .display{color:#fff}.hero .hl{color:var(--g)}
.hero p{color:var(--d-mute)}
.hero .caption{color:var(--g)}.hero .eyebrow b{color:#fff}
.crumb{font-size:14px;line-height:22px;color:var(--d-mute);margin-bottom:24px}.crumb a{color:#fff}
/* Partner ledger */
.ledger{background:var(--d-surface);border:1px solid var(--d-line);border-radius:16px;padding:8px 24px;align-self:center}
.ledger .caption{color:var(--d-mute);margin:16px 0 4px}
.ledger a{display:grid;grid-template-columns:48px 1fr auto;gap:16px;align-items:center;padding:16px 0;border-top:1px solid var(--d-line);color:#fff;text-decoration:none}
.ledger .caption+a{border-top:0}
.cc{font-weight:700;font-size:12px;line-height:16px;letter-spacing:.08em;color:var(--ink);background:var(--g);border-radius:4px;text-align:center;padding:8px 0}
.cc.alt{background:transparent;color:var(--g);border:1px solid var(--g)}
.ledger strong{display:block;font-weight:600;font-size:16px;line-height:24px}
.ledger small{display:block;color:var(--d-mute);font-size:14px;line-height:22px}
.ledger .arr{color:var(--g);font-weight:700}
.ledger a:hover strong{color:var(--g)}

/* Proof strip */
.strip .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.strip div{padding:32px 24px;border-left:1px solid var(--line)}.strip div:first-child{border-left:0;padding-left:0}
.strip b{display:block;font-size:32px;line-height:40px;color:var(--gt);font-weight:700}
.strip span{font-size:14px;line-height:22px;color:var(--mute)}

/* Feature blocks */
.flag{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.flag.rev .media{order:2}
.partner{display:inline-flex;gap:8px;align-items:center;font-size:14px;line-height:22px;font-weight:600;background:var(--tint);color:var(--gt);padding:4px 12px;border-radius:4px;margin-bottom:16px}
.partner i{font-style:normal;background:var(--g);color:var(--ink);border-radius:4px;padding:0 8px;font-size:12px;line-height:20px;letter-spacing:.08em}
.media{position:relative}
.media img{border-radius:16px;width:100%;aspect-ratio:4/3;object-fit:cover;background:var(--soft)}
.media img.contain{object-fit:contain;padding:24px;border:1px solid var(--line)}
.ph{border-radius:16px;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;text-align:center;padding:32px;font-size:14px;line-height:22px;color:var(--mute);background:repeating-linear-gradient(126deg,var(--soft) 0 16px,#fff 16px 32px);border:1px dashed var(--line)}
.ph b{display:block;color:var(--ink)}
.media .tag{position:absolute;left:-16px;bottom:24px;background:var(--g);color:var(--ink);font-weight:600;padding:12px 16px;border-radius:8px;font-size:14px;line-height:22px}
.media .tag b{display:block;font-size:32px;line-height:40px;font-weight:700}
.split{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}
.split div{border:1px solid var(--line);border-radius:8px;padding:24px;background:#fff}
.split h4{display:flex;gap:8px;align-items:center}.split h4::before{content:"";flex:none;width:12px;height:12px;border-radius:4px;background:var(--g)}
.split p{font-size:14px;line-height:22px;margin:0}
.ticks{list-style:none;padding:0;margin:16px 0 24px;display:grid;grid-template-columns:1fr 1fr;gap:8px 24px}
.ticks li{position:relative;padding-left:24px}
.ticks li::before{content:"";position:absolute;left:0;top:8px;width:12px;height:8px;border-left:2px solid var(--gt);border-bottom:2px solid var(--gt);transform:rotate(-45deg)}
.ticks.one{grid-template-columns:1fr}
.more{font-weight:600;text-decoration:none;border-bottom:2px solid var(--g);padding-bottom:2px;color:var(--ink)}
.more:hover{color:var(--gt)}

/* Cards */
.pair{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:48px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column}
.card .img{height:240px;background:var(--soft);display:flex;align-items:center;justify-content:center;padding:16px}
.card .img img{max-height:100%;width:auto;object-fit:contain}
.card .body{padding:32px;flex:1}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.mini{border-top:4px solid var(--ink);padding-top:24px;text-decoration:none;color:var(--ink)}
.mini img{aspect-ratio:4/3;object-fit:cover;border-radius:8px;margin-bottom:16px;background:var(--soft)}
.mini p{font-size:14px;line-height:22px}
a.mini:hover h4{color:var(--gt)}

/* Dark section, services */
.dark{background:var(--ink);color:#fff}.dark p{color:var(--d-mute)}.dark h2,.dark h3,.dark h4{color:#fff}.dark .caption{color:var(--g)}.dark .eyebrow b{color:#fff}
.svc{display:grid;grid-template-columns:repeat(3,1fr);margin-top:48px;border:1px solid var(--d-line);border-radius:16px;overflow:hidden}
.svc>*{padding:32px;border-left:1px solid var(--d-line);color:#fff;text-decoration:none}.svc>*:first-child{border-left:0}
a.svc-i:hover h3{color:var(--g)}

/* About */
.bridge{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.route{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center;margin-top:24px}
.route div{background:var(--soft);border-radius:8px;padding:16px 24px}
.route b{display:block}.route span{font-size:14px;line-height:22px;color:var(--mute)}
.route i{font-style:normal;font-size:24px;color:var(--gt)}
.team{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.team img{border-radius:8px;aspect-ratio:1;object-fit:cover;filter:grayscale(1)}
.team b{display:block;margin-top:8px}.team span{font-size:14px;line-height:22px;color:var(--mute)}
.plist{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-top:48px}
.plist article{border:1px solid var(--line);border-radius:16px;padding:32px}
.plist .cc{display:inline-block;padding:4px 8px;margin-bottom:16px}

/* Subpage helpers */
.tabs{position:sticky;top:80px;background:#fff;z-index:10;border-bottom:1px solid var(--line)}
.tabs .wrap{display:flex;overflow-x:auto}
.tabs a{padding:16px 24px;font-weight:600;font-size:14px;line-height:22px;text-decoration:none;color:var(--mute);border-bottom:2px solid transparent;white-space:nowrap}
.tabs a:first-child{padding-left:0}
.tabs a:hover{color:var(--ink);border-color:var(--g)}
.figs{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:32px 0}
.figs.four{grid-template-columns:repeat(4,1fr)}
.figs div{background:var(--tint);border-radius:8px;padding:24px}
.figs b{display:block;font-size:24px;line-height:32px;font-weight:600;color:var(--gt)}
.figs span{font-size:14px;line-height:22px;color:var(--ink)}
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:32px}
.steps div{counter-increment:s;border-top:4px solid var(--g);padding-top:16px}
.steps div::before{content:"0" counter(s);display:block;font-weight:600;color:var(--gt);font-size:12px;line-height:16px;letter-spacing:.08em;margin-bottom:8px}
.steps p{font-size:14px;line-height:22px}
.tbl{width:100%;border-collapse:collapse;font-size:14px;line-height:22px;margin-top:24px}
.tbl th{text-align:left;font-size:12px;line-height:16px;letter-spacing:.08em;text-transform:uppercase;color:var(--mute);border-bottom:2px solid var(--ink);padding:12px}
.tbl td{border-bottom:1px solid var(--line);padding:12px}
.tbl tr.em td{background:var(--tint);font-weight:600}
.video{aspect-ratio:16/9;border-radius:16px;background:var(--ink);display:flex;align-items:center;justify-content:center;color:#fff;text-decoration:none;flex-direction:column;gap:12px;font-size:14px;line-height:22px}
.video .play{width:72px;height:72px;border-radius:50%;background:var(--g);display:flex;align-items:center;justify-content:center}
.video .play::after{content:"";border-left:20px solid var(--ink);border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.note{background:var(--tint);border-left:4px solid var(--g);border-radius:4px;padding:16px 24px;margin:24px 0;color:var(--ink)}
.prose{max-width:70ch}.prose h2{margin-top:48px}.prose h3{margin-top:32px}

/* Contact */
.addr{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.addr div{border:1px solid var(--line);border-radius:16px;padding:32px}
.addr p{margin:0 0 8px;color:var(--ink)}

/* CTA + footer */
.cta{background:var(--g)}
.cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:32px;padding-top:64px;padding-bottom:64px}
.cta h2{margin:0}.cta p{color:var(--ink);margin:8px 0 0}
.cta .btn{background:var(--ink);color:#fff}.cta .btn:hover{background:var(--d-surface)}
.footer{background:var(--ink);color:#fff;padding:64px 0 32px;font-size:14px;line-height:22px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:32px}
.footer img{width:180px;margin-bottom:16px}
.footer p,.footer li{color:var(--d-mute);margin:0 0 8px}.footer ul{list-style:none;padding:0;margin:0}
.footer a{color:#fff;text-decoration:none}.footer a:hover{color:var(--g)}
.footer .caption{color:var(--g);margin-bottom:12px}
.footer .legal{border-top:1px solid var(--d-line);margin-top:48px;padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--d-mute)}

@media (max-width:980px){
 .display{font-size:40px;line-height:46px}h1{font-size:32px;line-height:40px}h2{font-size:26px;line-height:34px}h3{font-size:22px;line-height:30px}
 .lead{font-size:17px;line-height:28px}
 .wrap{padding:0 16px}.section{padding:64px 0}
 .brand img{width:120px}.head .wrap{height:64px}.tabs{top:64px}
 .nav,.head .btn{display:none}
 .menu{display:block;position:relative}
 .menu summary{list-style:none;cursor:pointer;font-weight:600;font-size:14px;border:2px solid var(--ink);border-radius:8px;padding:4px 12px}
 .menu summary::-webkit-details-marker{display:none}
 .menu nav{position:absolute;right:0;top:48px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 0;min-width:240px;display:flex;flex-direction:column}
 .menu nav a{padding:12px 24px;color:var(--ink);text-decoration:none;font-weight:600}
 .hero .wrap,.flag,.bridge,.pair{grid-template-columns:1fr;gap:48px}
 .hero .wrap{padding-top:64px;padding-bottom:96px}
 .flag.rev .media{order:0}
 .strip .wrap,.grid4,.figs.four,.steps{grid-template-columns:1fr 1fr}
 .strip div{padding:24px 16px}.strip div:nth-child(odd){border-left:0;padding-left:0}.strip b{font-size:24px;line-height:32px}
 .svc,.addr,.footer .cols{grid-template-columns:1fr}.svc>*{border-left:0;border-top:1px solid var(--d-line)}.svc>*:first-child{border-top:0}
 .split,.ticks{grid-template-columns:1fr}
 .media .tag{left:12px}
 .cta .wrap{flex-direction:column;align-items:flex-start}
 .tbl{display:block;overflow-x:auto}
}