/* Poppins, self-hosted (SIL Open Font License, see assets/fonts/OFL.txt): no request to Google */
@font-face{font-family:Poppins;font-weight:400;font-style:normal;font-display:swap;src:url(fonts/Poppins-Regular.ttf) format('truetype')}
@font-face{font-family:Poppins;font-weight:600;font-style:normal;font-display:swap;src:url(fonts/Poppins-SemiBold.ttf) format('truetype')}
@font-face{font-family:Poppins;font-weight:700;font-style:normal;font-display:swap;src:url(fonts/Poppins-Bold.ttf) format('truetype')}
/* Bert Energy website V5.6 – shared styles. Values from BERT-STYLEGUIDE.md (10.10.2026). */
:root{--g:#3DA578;--g-hover:#52B98A;--gt:#246B4C;--ink:#1B171B;--mute:#5C5A5E;--soft:#F4F7F5;--line:#D7DDD9;--tint:#E8F4EE;--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}
h1{font-size:40px;line-height:48px;font-weight:700;margin:8px 0 16px}
h1.display{font-size:60px;line-height:66px}
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}
p{color:var(--mute);margin:0 0 16px;max-width:70ch}
.lead{font-size:18px;line-height:30px}
.hl{color:var(--gt)}
.wrap{max-width:1200px;margin:auto;padding:0 32px}
.section{padding:96px 0}.soft{background:var(--soft)}
.eyebrow{color:var(--gt);text-transform:uppercase;font-size:12px;line-height:16px;letter-spacing:.08em;font-weight:600;margin-bottom:8px}
.note{font-size:14px;line-height:22px}

/* Header / footer */
.head{position:sticky;top:0;background:#fff;z-index:9;border-bottom:1px solid var(--line)}
.head .wrap{display:flex;justify-content:space-between;align-items:center;gap:24px;padding-top:16px;padding-bottom:16px}
.head .logo img{width:180px;height:auto}
.nav{display:flex;flex-wrap:wrap;gap:16px;font-size:14px;font-weight:600}
.nav a{color:var(--ink);text-decoration:none}.nav a:hover,.nav a[aria-current]{color:var(--gt)}
.footer{background:var(--ink);color:#fff;padding:48px 0;font-size:14px;line-height:22px}
.footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px}
.footer img{width:160px;margin-bottom:16px}.footer p{color:#A8A5AA;margin:0 0 4px}.footer a{color:#fff}

/* Buttons */
.btn{border:0;background:var(--g);color:var(--ink);font:600 16px/24px var(--font);padding:12px 24px;border-radius:8px;display:inline-block;text-decoration:none;cursor:pointer}
.btn:hover{background:var(--g-hover)}
.btn-outline{background:transparent;border:2px solid var(--ink);padding:10px 22px}.btn-outline:hover{background:var(--soft)}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
a:focus-visible,button:focus-visible{outline:2px solid var(--gt);outline-offset:2px}

/* Grids */
.grid2{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:48px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}

/* Cards, panels */
.card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;text-decoration:none;color:var(--ink);display:block}
.card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.card .cap{padding:16px}.card h4{margin:0 0 4px}.card p{font-size:14px;line-height:22px;margin:0}
a.card:hover h4{color:var(--gt)}
.panel{background:#fff;border:1px solid var(--line);border-radius:8px;padding:24px}
.callout{background:var(--tint);border-left:4px solid var(--g);border-radius:8px;padding:24px 32px;margin-top:48px}
.callout p:last-child{margin-bottom:0}.callout p{color:var(--ink)}

/* Photo grid (LushBert pattern) */
.photo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0 48px}
.photo-grid.four{grid-template-columns:repeat(4,1fr)}
.photo-grid figure{margin:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.photo-grid img{width:100%;aspect-ratio:4/3;object-fit:cover}
.photo-grid figcaption{padding:12px 16px;font-size:14px;line-height:22px;color:var(--mute)}
.photo-grid figcaption strong{display:block;color:var(--ink);font-weight:600}

/* Click-to-load YouTube with own start image */
.player{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;background:var(--ink);border-radius:8px;overflow:hidden;cursor:pointer}
.player img{width:100%;height:100%;object-fit:cover}
.player .play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--g);color:var(--ink);font:600 16px/24px var(--font);padding:12px 24px;border-radius:8px;white-space:nowrap}
.player .badge{position:absolute;left:16px;bottom:16px;background:var(--ink);color:#fff;font-size:12px;line-height:16px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:8px 12px;border-radius:4px}
.player:hover .play{background:var(--g-hover)}
.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.player-text{background:var(--ink)}
.player-text .vt{position:absolute;left:16px;right:16px;top:16px;color:#fff;font:600 18px/26px var(--font);text-align:left}
.player-text .play{top:58%}
.explainers{margin-top:24px;align-items:start}.explainers figure{margin:0}.explainers h4{margin-top:12px}

/* Featured block */
.featured{display:grid;grid-template-columns:3fr 2fr;gap:48px;align-items:center}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
.facts div{background:var(--tint);border-radius:8px;padding:16px}
.facts strong{display:block;font-size:20px;line-height:28px;color:var(--gt)}
.facts span{font-size:14px;line-height:22px;color:var(--ink)}
.checklist{list-style:none;padding:0;margin:0 0 16px}
.checklist li{padding-left:28px;position:relative;margin-bottom:8px;color:var(--ink)}
.checklist li:before{content:'';position:absolute;left:0;top:7px;width:12px;height:12px;background:var(--g);border-radius:4px}

/* Scale steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s;margin-top:24px}
.steps>div{counter-increment:s;background:#fff;border:1px solid var(--line);border-top:4px solid var(--g);border-radius:8px;padding:24px 16px 16px}
.steps>div:before{content:counter(s);display:block;font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--gt);margin-bottom:4px}
.steps p{font-size:14px;line-height:22px;margin:0}

/* Reference table */
table.refs{width:100%;border-collapse:collapse;margin:16px 0 0;font-size:14px;line-height:22px}
table.refs th,table.refs td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}
table.refs th{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--mute)}
table.refs td:first-child{font-weight:600;white-space:nowrap}

/* Video cards */
.video-card .thumb{position:relative;background:var(--ink)}
.video-card .thumb img{aspect-ratio:16/9;object-fit:cover;width:100%}
.video-card .thumb:after{content:'▶';position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--g);color:var(--ink);padding:8px 16px;border-radius:8px;font-size:16px}

/* Existing V5.5 pieces */
.thumb-btn{position:relative;border:0;background:none;width:100%;padding:0;cursor:pointer}
.thumb-btn img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:8px}
.thumb-btn:after{content:'▶';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--g);padding:12px 24px;border-radius:8px;font-size:24px}
.video{display:none;margin:24px auto;max-width:900px}.video.show{display:block}.video video{width:100%}
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.flow>div{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px}
.flow h4{margin:0 0 4px}.flow p{margin:0;font-size:14px}
.flowout{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.flowout>div{background:var(--tint);padding:16px;border-radius:8px}
/* Zoom viewer for graphics (img.zoomable) */
.zoomable{cursor:zoom-in}
.grid-wide-right{grid-template-columns:2fr 3fr}
.zoom{border:0;padding:0;width:96vw;height:94vh;max-width:none;max-height:none;border-radius:8px;overflow:hidden}
.zoom[open]{display:flex;flex-direction:column}
.zoom::backdrop{background:#1B171Bdd}
.zoom-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);background:#fff}
.zoom-bar .btn{padding:6px 14px}
.zoom-pct{min-width:56px;text-align:center;font-weight:600}
.zoom-hint{font-size:14px;color:var(--mute);margin-right:auto}
.zoom-stage{flex:1;overflow:auto;background:var(--soft);cursor:grab;touch-action:pan-x pan-y pinch-zoom}
.zoom-stage.dragging{cursor:grabbing}
.zoom-stage img{display:block;max-width:none;margin:0 auto;user-select:none;-webkit-user-drag:none}
@media(max-width:650px){.zoom-hint{display:none}.grid-wide-right{grid-template-columns:1fr}}
@media(max-width:950px){.grid-wide-right{grid-template-columns:1fr}}
.franchise{background:var(--tint);padding:32px;border-left:4px solid var(--g);border-radius:8px}

/* Hero badges */
.badgebar{display:grid;grid-template-columns:repeat(3,1fr);margin-top:48px;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.badgebar div{padding:16px 24px;font-weight:600;text-align:center;background:var(--tint)}
.badgebar div+div{border-left:1px solid var(--line)}

/* Chart boxes */
.chartbox{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;margin-top:48px}
.chart-head{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:24px}
.chart-head h3{margin:0 0 4px}.chart-head p{margin:0}
.bars{display:grid;gap:4px}
.bar-row{display:grid;grid-template-columns:200px 1fr 130px;align-items:center;gap:16px;border:0;background:none;padding:6px 8px;border-radius:4px;font:inherit;text-align:left;cursor:pointer;color:var(--ink)}
.bar-row:hover,.bar-row:focus-visible,.bar-row.active{background:var(--tint)}
.bar-name{font-size:14px;line-height:22px;font-weight:600;text-align:right}
.bar-name small{font-weight:400;color:var(--mute);margin-left:4px}
.bar-track{height:20px}
.bar-fill{height:100%;background:var(--g);border-radius:0 4px 4px 0;min-width:4px}
.bar-val{font-size:14px;line-height:22px}.bar-val strong{font-size:16px}.bar-val span{color:var(--mute);margin-left:8px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.tags span{background:#fff;border:1px solid var(--line);border-radius:4px;padding:8px 16px;font-weight:600;font-size:14px}
#usage-chart svg{width:100%;height:auto;display:block}
.usage-tip{font:600 12px var(--font)}

/* Team */
.people{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:16px}
.person{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;text-align:center}
.person img,.person .avatar{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 12px}
.person .avatar{display:grid;place-items:center;background:var(--tint);color:var(--gt);font-size:32px;font-weight:700}
.person strong{display:block}.person span{display:block;font-size:14px;line-height:22px;color:var(--mute)}

/* Contact form */
.contactgrid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.formbox{background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:32px;display:grid;gap:8px}
.formbox h3{margin-bottom:8px}
.formbox label{font-size:14px;line-height:22px;font-weight:600;display:block;margin-bottom:4px}
.formbox input,.formbox textarea{font:400 16px/24px var(--font);padding:8px 12px;border:1px solid var(--line);border-radius:4px;background:#fff;width:100%}
.form2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.formbox .btn{justify-self:start;margin-top:8px}

/* Footer columns, top link */
.footer .footergrid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:32px}
.footergrid strong{display:block;margin-bottom:8px}
.footergrid a{display:block;margin:4px 0;color:#A8A5AA;text-decoration:none}.footergrid a:hover{color:var(--g)}
.toplink{position:fixed;left:24px;bottom:24px;z-index:700;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 16px;font-weight:600;font-size:14px;color:var(--ink);text-decoration:none}

@media(max-width:950px){.contactgrid,.footer .footergrid{grid-template-columns:1fr 1fr}.people{grid-template-columns:1fr 1fr}.bar-row{grid-template-columns:150px 1fr 110px}}
@media(max-width:650px){.badgebar,.contactgrid,.form2,.footer .footergrid{grid-template-columns:1fr}.badgebar div+div{border-left:0;border-top:1px solid var(--line)}.chartbox{padding:24px 16px}.chart-head{display:block}.chart-head .btn{margin-top:12px}.bar-row{grid-template-columns:1fr auto;gap:4px 8px}.bar-name{text-align:left}.bar-track{grid-column:1/-1;grid-row:2}.toplink{display:none}.people{grid-template-columns:1fr 1fr}}

/* Biogas calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:48px;background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:32px}
.calc-form{display:grid;gap:8px;max-width:400px}
.calc-form label{font-size:14px;line-height:22px;font-weight:600;margin-top:8px}
.calc-form select,.calc-form input{font:400 16px/24px var(--font);padding:8px 12px;border:1px solid var(--line);border-radius:4px;background:#fff;width:100%}
.calc-qty{display:grid;grid-template-columns:2fr 1fr;gap:8px}
.calc-form .btn{margin-top:16px;justify-self:start}
.calc-out{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-content:start}
.calc-out>div{background:#fff;border:1px solid var(--line);border-top:4px solid var(--g);border-radius:8px;padding:16px}
.calc-out strong{display:block;font-size:32px;line-height:40px;color:var(--gt)}
.calc-out span{font-size:14px;line-height:22px;color:var(--ink)}
.calc-out .note{grid-column:1/-1;margin:0}
.calc-prices{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.calc-prices label{display:block;margin-bottom:8px}
.calc-money{display:block;margin-top:8px;padding-top:8px;border-top:1px solid var(--line);font-style:normal;font-weight:600;font-size:14px;line-height:22px;color:var(--gt)}
.calc-glance{margin:24px 0 0;font-weight:600;color:var(--gt)}
.calc-next{margin-top:16px;background:var(--tint);border-radius:8px;padding:24px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.calc-next p{margin:0;max-width:640px}.calc-next .actions{margin:0}
@media(max-width:650px){.calc-prices{grid-template-columns:1fr}}
@media(max-width:950px){.calc{grid-template-columns:1fr}}
@media(max-width:650px){.calc{padding:24px 16px}.calc-out{grid-template-columns:1fr}}

/* Ask Bert is switched off until the Bert wiki is ready: delete this rule and set ASK_ENABLED = true in site.js */
[data-ask]{display:none !important}

/* Floating assistant (Bert wiki) */
.ask-fab{position:fixed;right:24px;bottom:24px;z-index:999;border:0;border-radius:8px;padding:12px 24px;background:var(--g);color:var(--ink);font:600 16px/24px var(--font);box-shadow:0 8px 24px rgba(27,23,27,.18);cursor:pointer}
.ask-fab:hover{background:var(--g-hover)}
.ask-panel{position:fixed;right:24px;bottom:88px;z-index:998;width:min(380px,calc(100vw - 32px));max-height:calc(100vh - 120px);display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 16px 40px rgba(27,23,27,.16);overflow:hidden}
.ask-panel[hidden]{display:none}
.ask-head{display:flex;justify-content:space-between;align-items:center;padding:16px 24px;background:var(--ink);color:#fff}
.ask-close{border:0;background:none;color:#fff;font-size:24px;line-height:24px;cursor:pointer}
.ask-log{padding:16px 24px;overflow-y:auto;flex:1;min-height:120px}
.ask-msg{font-size:14px;line-height:22px;padding:8px 12px;border-radius:8px;margin:0 0 8px;max-width:90%}
.ask-msg.bot{background:var(--tint);color:var(--ink)}
.ask-msg.user{background:var(--soft);color:var(--ink);margin-left:auto}
.ask-form{display:grid;gap:8px;padding:16px 24px;border-top:1px solid var(--line)}
.ask-form[hidden]{display:none}
.ask-form textarea,.ask-form input[type=email]{font:400 14px/22px var(--font);padding:8px 12px;border:1px solid var(--line);border-radius:4px;resize:vertical;width:100%}
.ask-form label{font-size:14px;line-height:22px;font-weight:600}
.ask-form .ask-consent{font-weight:400;color:var(--mute);display:flex;gap:8px;align-items:flex-start}
.ask-consent input{margin-top:5px}
.ask-actions{display:flex;gap:8px;justify-content:flex-end}
.ask-mic{width:48px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:20px;line-height:24px;cursor:pointer}
.ask-mic[hidden]{display:none}
.ask-mic:hover{border-color:var(--g)}
.ask-mic.rec{background:var(--g);border-color:var(--g);animation:ask-pulse 1.2s ease-in-out infinite}
@keyframes ask-pulse{0%,100%{box-shadow:0 0 0 0 rgba(61,165,120,.5)}50%{box-shadow:0 0 0 8px rgba(61,165,120,0)}}
@media(prefers-reduced-motion:reduce){.ask-mic.rec{animation:none}}
@media(max-width:650px){.ask-fab{right:16px;bottom:16px}.ask-panel{right:16px;bottom:76px}}

@media(max-width:950px){.grid2,.featured{grid-template-columns:1fr}.grid3,.grid4,.photo-grid,.photo-grid.four,.steps{grid-template-columns:1fr 1fr}}
@media(max-width:767px){h1{font-size:32px;line-height:40px}h1.display{font-size:40px;line-height:46px}h2{font-size:26px;line-height:34px}h3{font-size:22px;line-height:30px}.lead{font-size:17px;line-height:28px}}
@media(max-width:650px){.wrap{padding:0 16px}.section{padding:64px 0}.grid3,.grid4,.photo-grid,.photo-grid.four,.flow,.flowout,.steps,.facts{grid-template-columns:1fr}.head .wrap{display:block}.nav{margin-top:12px;font-size:13px}.head .logo img{width:120px}table.refs td:first-child{white-space:normal}.player .play{font-size:14px;padding:8px 16px}}

/* YouTube two-click notice */
.yt-note{font-size:12px;line-height:16px;color:var(--mute);margin:8px 0 0}

/* Legal pages */
.legal .wrap{max-width:860px}.legal h2{font-size:24px;line-height:32px;margin-top:40px}.legal h3{margin-top:24px}
.legal article+article{margin-top:64px;padding-top:48px;border-top:1px solid var(--line)}
.legal-lang{font-weight:600}
.todo{background:#FFF4D6;color:var(--ink);padding:0 4px;border-radius:4px}
.legal-links a{display:block;margin:4px 0;color:#A8A5AA;text-decoration:none}.legal-links a:hover{color:var(--g)}

/* How it works: video + plant layout */
.howgrid{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:32px;align-items:start}
.howcard{margin:0;background:var(--tint);border:1px solid var(--line);border-top:4px solid var(--g);border-radius:16px;padding:16px}
.howcard .player{background:var(--tint)}
.howcard>img{width:100%;aspect-ratio:16/9;object-fit:contain;background:#fff;border-radius:8px}
.howcard figcaption{padding:16px 8px 8px}.howcard h3{margin-top:4px}
.howgrid+.flowout{margin-top:24px}
@media(max-width:950px){.howgrid{grid-template-columns:1fr}}

/* Data tables behind charts and images (readable for screen readers, search engines and AI) */
.datatable{margin-top:16px}.datatable summary{cursor:pointer;font-weight:600;color:var(--gt)}
.datatable table{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px;line-height:22px;background:#fff}
.datatable caption{text-align:left;color:var(--mute);padding-bottom:8px}
.datatable th,.datatable td{padding:6px 10px;border-bottom:1px solid var(--line);text-align:right}.datatable th:first-child,.datatable td:first-child{text-align:left}
.datatable th{background:var(--ink);color:#fff;font-weight:600}

/* LinkedIn link (inline icon, no request to LinkedIn) */
.li-link{display:inline-flex!important;align-items:center;gap:8px;margin-top:8px}.li-link svg{flex:none}
.footer .li-link{color:#fff}.footer .li-link:hover{color:var(--g)}
.li-card{justify-content:center;margin-top:12px;color:var(--gt);font-size:14px;font-weight:600;text-decoration:none}.li-card:hover{color:var(--g)}