:root{--bg:#dcdcdc;--paper:#f4f4f2;--card:#fff;--ink:#0a0a0a;--mute:#777;--line:#cfcfcf;--r:4px;--mono:"Space Mono",ui-monospace,monospace;--sans:"Inter",system-ui,sans-serif;--ease:cubic-bezier(.2,.8,.2,1)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.5;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--mono);font-weight:400;letter-spacing:-.02em}
b,strong{font-weight:600}
.mono{font-family:var(--mono)}

/* loader */
.loader{position:fixed;inset:0;background:var(--ink);color:#fff;z-index:100;display:grid;place-items:center;align-content:center;gap:18px;font-family:var(--mono);font-size:12px;letter-spacing:.3em;transition:clip-path .9s var(--ease)}
.loader-sun{width:46px;height:46px;border-radius:50%;border:2px solid #fff;border-top-color:transparent;animation:spin 1s linear infinite}
.loaded .loader{clip-path:inset(0 0 100% 0)}
@keyframes spin{to{transform:rotate(360deg)}}

.cursor{position:fixed;width:28px;height:28px;border:1px solid var(--ink);border-radius:50%;pointer-events:none;z-index:90;transform:translate(-50%,-50%);transition:width .25s,height .25s,background .25s;mix-blend-mode:difference;border-color:#fff}
.cursor.hover{width:56px;height:56px;background:#fff}
@media (hover:none){.cursor{display:none}}

/* nav */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px clamp(16px,4vw,40px);background:rgba(244,244,242,.8);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .3s,padding .3s}
.nav.scrolled{border-color:var(--line);padding-block:10px}
.brand{display:flex;align-items:center;gap:8px;font-weight:500}
.links{display:flex;border:1px solid var(--line);border-radius:var(--r);padding:3px;background:#fff}
.links a{font-size:13px;padding:7px 16px;border-radius:3px;transition:background .25s,color .25s}
.links a:hover{background:#eee}
.links a.active{background:var(--ink);color:#fff}
.burger{display:none;background:none;border:0;width:36px;height:36px;cursor:pointer;flex-direction:column;justify-content:center;gap:6px;align-items:center}
.burger span{width:22px;height:1.5px;background:var(--ink);transition:transform .3s}
.burger[aria-expanded=true] span:first-child{transform:translateY(3.75px) rotate(45deg)}
.burger[aria-expanded=true] span:last-child{transform:translateY(-3.75px) rotate(-45deg)}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 22px;border-radius:var(--r);font-size:14px;font-weight:500;border:1px solid var(--ink);cursor:pointer;transition:transform .3s var(--ease),background .3s,color .3s;font-family:inherit}
.btn:hover{transform:translateY(-2px)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#333}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-light{background:#fff;color:var(--ink);border-color:#fff}
.btn-light:hover{background:transparent;color:#fff}
.full{width:100%}

/* hero */
.hero{position:relative;padding:40px clamp(16px,4vw,40px) 40px;background:linear-gradient(#ececea,var(--paper))}
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:80px 80px;opacity:.35;mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 75%);pointer-events:none}
.hero-head{position:relative;max-width:640px;z-index:2}
.eyebrow{font-family:var(--mono);font-size:12px;color:var(--mute);text-transform:uppercase;letter-spacing:.1em;margin-bottom:14px}
h1{font-size:clamp(38px,6vw,68px);line-height:1.02;margin-bottom:16px}
.sub{color:#555;font-size:15px;max-width:460px}
.hero-ctas{display:flex;gap:10px;margin-top:24px;flex-wrap:wrap}

.house-wrap{position:relative;width:100%;max-width:640px;justify-self:center;z-index:1}
.house{width:100%;height:auto;display:block;filter:drop-shadow(0 30px 30px rgba(0,0,0,.12))}
.house .panels{transform-origin:300px 110px}
.house .pv{animation:shimmer 4s ease-in-out infinite}
.house .pv:nth-child(2){animation-delay:.6s}
@keyframes shimmer{0%,100%{opacity:1}50%{opacity:.78}}
.house .scan{animation:scan 5s ease-in-out infinite}
@keyframes scan{0%{transform:translateY(0);opacity:0}20%{opacity:.2}80%{opacity:.2}100%{transform:translateY(420px);opacity:0}}
.house .plants ellipse{transform-box:fill-box;transform-origin:bottom center;animation:sway 5s ease-in-out infinite}
.house .plants ellipse:nth-child(even){animation-delay:-2s}
@keyframes sway{0%,100%{transform:rotate(-2deg)}50%{transform:rotate(2deg)}}
.tag{position:absolute;font-family:var(--mono);font-size:11px;background:#fff;border:1px solid var(--ink);padding:5px 9px;border-radius:2px;white-space:nowrap;animation:float 4s ease-in-out infinite}
.tag-1{top:14%;right:4%}.tag-2{top:48%;left:0;animation-delay:-1.3s}.tag-3{bottom:16%;right:0;animation-delay:-2.6s;background:var(--ink);color:#fff}
@keyframes float{50%{transform:translateY(-8px)}}

/* cards */
.cards{position:relative;display:grid;gap:10px;grid-template-columns:repeat(4,1fr);margin-top:20px;z-index:3}
.card{z-index:2}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:10px;transition:transform .4s var(--ease),box-shadow .4s;min-height:150px;position:relative}
.card::before,.card::after{content:"+";position:absolute;font-size:10px;color:#aaa;line-height:1}
.card::before{top:-6px;left:-4px}.card::after{bottom:-6px;right:-4px}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px -20px rgba(0,0,0,.35)}
.card header{display:flex;justify-content:space-between;align-items:center}
.card h2{font-size:14px}
.arr{transition:transform .3s}
.card:hover .arr{transform:rotate(45deg)}
.row{display:flex;justify-content:space-between;align-items:center}
.ico{font-size:22px}
.big{font-family:var(--mono);font-size:22px;font-weight:400}
.big small{font-size:12px;color:var(--mute)}
.muted{font-size:12px;color:var(--mute)}
.muted b{color:var(--ink);font-weight:500}
.right{text-align:right}
.xl{font-family:var(--mono);font-size:28px;font-weight:400!important}
.svgtxt{font-family:var(--mono);font-size:13px;fill:var(--ink)}
.svgtxt.big{font-size:22px}
.sunarc,.gauge,.ring{width:100%;max-width:240px;margin:auto auto 0}
.gauge .needle{transform-origin:100px 110px;transform:rotate(-90deg);transition:transform 2s var(--ease)}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--ink);margin:0 4px 0 8px}
.dot.light{background:#ddd}
.kv{display:grid;grid-template-columns:auto auto;gap:2px 12px;font-size:12px;color:var(--mute)}
.kv b{color:var(--ink);font-weight:500}
.bars{display:flex;align-items:flex-end;gap:3px;height:80px;margin-top:auto}
.bars i{flex:1;background:var(--ink);height:4%;transition:height 1.2s var(--ease);border-radius:1px}
.pill{height:54px;border-radius:30px;background:#e8e8e8;overflow:hidden;border:1px solid var(--line)}
.pill-fill{height:100%;width:0;background:var(--ink);border-radius:30px;transition:width 2s var(--ease)}
.c-earn,.c-co2{grid-column:1}
.c-earn{grid-row:1}.c-co2{grid-row:2}
.c-sun{grid-column:4;grid-row:1/3}
.c-out,.c-bal,.c-bat{grid-row:3}
.c-pow{grid-row:3}
.c-earn{align-self:end}.c-co2{align-self:start}
.c-sun{align-self:end}
.cards>.house-wrap{grid-column:2/4;grid-row:1/3;margin:-60px 0 -10px}

/* marquee */
.marquee{overflow:hidden;background:var(--ink);color:#fff;padding:18px 0;font-family:var(--mono);font-size:14px}
.track{display:flex;gap:40px;width:max-content;animation:marq 30s linear infinite}
@keyframes marq{to{transform:translateX(-50%)}}

/* sections */
.section{padding:clamp(64px,10vw,120px) clamp(16px,4vw,40px)}
.section.dark{background:var(--ink);color:#fff}
.section.dark .eyebrow,.section.dark .sub,.section.dark p{color:#aaa}
.sec-head{max-width:720px;margin-bottom:48px}
.sec-head h2{font-size:clamp(28px,4.5vw,48px);line-height:1.1;margin-bottom:12px}
.features{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--ink);border-left:1px solid var(--ink)}
.feat{padding:32px 28px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);position:relative;overflow:hidden;transition:color .4s}
.feat::before{content:"";position:absolute;inset:0;background:var(--ink);transform:translateY(101%);transition:transform .5s var(--ease);z-index:-1}
.feat{z-index:0}
.feat:hover{color:#fff}
.feat:hover::before{transform:none}
.feat:hover p{color:#bbb}
.num{font-family:var(--mono);font-size:12px;border:1px solid currentColor;border-radius:50%;width:28px;height:28px;display:grid;place-items:center;margin-bottom:40px}
.feat h3{font-size:20px;margin-bottom:10px}
.feat p{color:#555;font-size:14px;transition:color .4s}

.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step span{font-family:var(--mono);font-size:44px;display:block;color:#fff;margin-bottom:12px}
.step h3{font-size:18px;margin-bottom:8px}
.step p{font-size:14px}
.progress-line{height:1px;background:#333;margin-top:40px}
.progress-line span{display:block;height:100%;width:0;background:#fff;transition:width 1.8s var(--ease)}
.progress-line.in span{width:100%}

.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.plan{border:1px solid var(--ink);border-radius:var(--r);padding:32px 28px;background:#fff;display:flex;flex-direction:column;gap:14px;transition:transform .4s var(--ease),box-shadow .4s}
.plan:hover{transform:translateY(-8px);box-shadow:0 30px 60px -30px rgba(0,0,0,.4)}
.plan.featured{background:var(--ink);color:#fff}
.plan-tag{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--mute)}
.featured .plan-tag{color:#aaa}
.plan h3{font-size:24px}
.price{font-family:var(--mono);font-size:48px;line-height:1}
.price small{font-size:13px;color:var(--mute);margin-left:6px}
.plan ul{list-style:none;flex:1;margin:10px 0}
.plan li{padding:9px 0;border-bottom:1px dashed var(--line);font-size:14px}
.featured li{border-color:#333}
.plan li::before{content:"✓  ";font-family:var(--mono)}
.calc{margin-top:40px;border:1px solid var(--ink);border-radius:var(--r);padding:24px;display:grid;gap:14px;background:#fff}
.calc label{font-family:var(--mono)}
.calc strong{font-family:var(--mono);font-size:24px}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--ink);border-radius:2px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:#fff;border:2px solid var(--ink);cursor:pointer}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:#fff;border:2px solid var(--ink);cursor:pointer}

.faq{max-width:820px;border-top:1px solid var(--ink)}
.faq details{border-bottom:1px solid var(--ink);padding:20px 0}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;font-family:var(--mono);font-size:17px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";transition:transform .3s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{color:#555;padding-top:12px;animation:fade .4s}
@keyframes fade{from{opacity:0;transform:translateY(-6px)}}

.contact{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact h2{font-size:clamp(28px,4.5vw,48px);line-height:1.1;margin-bottom:12px}
.contact .mono{margin-top:24px;color:#fff!important}
.form{display:grid;gap:14px}
.form label{display:grid;gap:6px;font-size:12px;font-family:var(--mono);color:#aaa;text-transform:uppercase}
.form input,.form select,.form textarea{background:transparent;border:0;border-bottom:1px solid #444;color:#fff;padding:10px 0;font:inherit;font-family:var(--sans);font-size:15px;text-transform:none;transition:border-color .3s}
.form select option{color:#000}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:#fff}
.form-msg{font-family:var(--mono);font-size:13px}

.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:24px clamp(16px,4vw,40px);font-size:12px;font-family:var(--mono);border-top:1px solid var(--line)}

/* reveal */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.split .w{display:inline-block;white-space:nowrap}
.split .ch{display:inline-block;opacity:0;transform:translateY(100%) rotate(6deg);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.split.in .ch{opacity:1;transform:none}

/* responsive */
@media (max-width:1024px){
  .cards{grid-template-columns:repeat(2,1fr);margin-top:0}
  .c-earn,.c-co2,.c-sun,.c-out,.c-bal,.c-pow,.c-bat{grid-column:auto;grid-row:auto;margin-top:0}
  .cards>.house-wrap{grid-column:1/-1;grid-row:1;margin:0 auto}
  .features{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .links{position:fixed;inset:60px 16px auto;flex-direction:column;padding:8px;transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s var(--ease)}
  .links.open{transform:none;opacity:1;pointer-events:auto}
  .links a{padding:12px}
  .burger{display:flex}
  .nav-cta{display:none}
  .plans,.contact{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .tag{font-size:10px}
}
@media (max-width:480px){
  .cards{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.split .w{display:inline-block;white-space:nowrap}
.split .ch{opacity:1;transform:none}
}

/* ---- multi-page components ---- */
.page-hero{position:relative;padding:clamp(56px,9vw,110px) clamp(16px,4vw,40px) clamp(40px,6vw,64px);background:linear-gradient(#ececea,var(--paper));border-bottom:1px solid var(--line);overflow:hidden}
.page-hero>*{position:relative}
.crumbs{font-family:var(--mono);font-size:12px;color:var(--mute);margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap}
.crumbs a{border-bottom:1px solid transparent;transition:border-color .3s}
.crumbs a:hover{border-color:currentColor}
.more{margin-top:32px}
.btn-outline-light{border-color:#fff;color:#fff;background:transparent}
.btn-outline-light:hover{background:#fff;color:var(--ink)}
.cta-band{text-align:center}
.cta-band h2{font-size:clamp(28px,5vw,56px);line-height:1.1;margin-bottom:14px}
.cta-band .sub{margin:0 auto}
.cta-band .hero-ctas{justify-content:center}

.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.post-card{display:flex;flex-direction:column;gap:12px;border:1px solid var(--ink);border-radius:var(--r);padding:26px;background:#fff;transition:transform .4s var(--ease),background .4s,color .4s}
.post-card h3{font-size:18px;line-height:1.3}
.post-card p{font-size:14px;color:#555;flex:1;transition:color .4s}
.post-card:hover{transform:translateY(-6px);background:var(--ink);color:#fff}
.post-card:hover p,.post-card:hover .muted{color:#aaa}
.tag-s{align-self:flex-start;font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.08em;border:1px solid currentColor;padding:3px 8px;border-radius:20px}

.post-head{position:relative;padding:clamp(56px,9vw,110px) clamp(16px,4vw,40px) 40px;border-bottom:1px solid var(--line);background:linear-gradient(#ececea,var(--paper));overflow:hidden}
.post-head>*{position:relative;max-width:820px;margin-left:auto;margin-right:auto}
.post-head h1{font-size:clamp(30px,4.6vw,52px);line-height:1.1}
.prose{max-width:760px;margin:0 auto;padding:48px clamp(16px,4vw,40px) 24px;font-size:17px;line-height:1.75;color:#222}
.prose h2{font-size:clamp(22px,3vw,28px);line-height:1.25;margin:44px 0 14px}
.prose p,.prose ul,.prose ol,.prose .table-wrap{margin-bottom:18px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-bottom:6px}
.prose a{border-bottom:1px solid var(--ink);font-weight:500;transition:background .25s}
.prose a:hover{background:var(--ink);color:#fff}
.prose .lead{font-size:20px;line-height:1.6;color:var(--ink)}
.prose .note{font-size:14px;color:var(--mute);border-left:2px solid var(--ink);padding-left:14px}
.table-wrap{overflow-x:auto}
.prose table{width:100%;border-collapse:collapse;font-size:15px}
.prose th,.prose td{border:1px solid var(--ink);padding:10px 14px;text-align:left}
.prose th{background:var(--ink);color:#fff;font-weight:500}

.deliver{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.deliver>div{border:1px solid var(--ink);border-radius:var(--r);padding:26px;background:#fff}
.deliver h3,.contact-info h3{font-size:18px;margin-bottom:14px}
.ticks-list{list-style:none}
.ticks-list li{padding:8px 0;border-bottom:1px dashed var(--line);font-size:14px}
.ticks-list li::before{content:"✓  ";font-family:var(--mono)}

.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start}
.prose-sm p{font-size:17px;line-height:1.75;margin-bottom:16px;color:#333}
.stats{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink);border-left:1px solid var(--ink)}
.stat{padding:26px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);display:grid;gap:6px}
.stat strong{font-family:var(--mono);font-size:34px;font-weight:400}
.stat>span{font-size:13px;color:var(--mute)}
.contact-info h3{color:#fff;margin:22px 0 6px}
.contact-info h3:first-child{margin-top:0}

.footer{background:var(--ink);color:#fff}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.4fr 1fr;gap:32px;padding:56px clamp(16px,4vw,40px) 40px}
.foot-grid p{color:#999;font-size:14px;margin-top:12px;max-width:320px}
.foot-grid h3{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:#888;margin-bottom:14px}
.foot-grid nav,.foot-grid>div{display:flex;flex-direction:column;gap:8px;font-size:14px}
.foot-grid nav a:hover,.foot-grid>div a:hover{text-decoration:underline}
.footer .foot{border-color:#222;color:#999}

@media (max-width:1024px){
  .post-grid,.deliver{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .about-grid{grid-template-columns:1fr}
}
@media (max-width:760px){
  .post-grid,.deliver{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .prose{font-size:16px}
}
.dark .features{border-color:#333}
.dark .feat{border-color:#333}
.dark .feat p{color:#aaa}
.dark .feat::before{background:#fff}
.dark .feat:hover{color:var(--ink)}
.dark .feat:hover p{color:#444}

/* ---- long-form blog components ---- */
.prose h3{font-size:19px;margin:28px 0 10px}
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--ink);border-radius:var(--r);margin:28px 0;background:#fff}
.stat-strip div{padding:18px;border-right:1px solid var(--ink);display:grid;gap:4px}
.stat-strip div:last-child{border-right:0}
.stat-strip strong{font-family:var(--mono);font-size:26px;font-weight:400;line-height:1.1}
.stat-strip span{font-size:12px;color:var(--mute);line-height:1.4}
.num-list{counter-reset:n;list-style:none;padding-left:0!important}
.num-list li{counter-increment:n;position:relative;padding:10px 0 10px 52px;border-bottom:1px dashed var(--line);margin:0}
.num-list li::before{content:counter(n,decimal-leading-zero);position:absolute;left:0;top:10px;font-family:var(--mono);font-size:13px;border:1px solid var(--ink);border-radius:50%;width:34px;height:34px;display:grid;place-items:center}
.prose table.cmp{font-size:13px}
.prose table.cmp td:nth-child(2),.prose table.cmp th:nth-child(2){background:#f0f0ee;font-weight:500}
.prose table.cmp th:nth-child(2){background:#333}
.prose td:first-child{font-weight:500}
.cta-box{background:var(--ink);color:#fff;border-radius:var(--r);padding:32px;margin:40px 0}
.cta-box .eyebrow{color:#999}
.cta-box h3{font-size:24px;margin:0 0 10px;line-height:1.2}
.cta-box p{color:#bbb}
.prose .cta-box a.btn{border-bottom:1px solid #fff;margin-top:8px}
.prose .cta-box a.btn:hover{background:transparent;color:#fff}
.post-faq{max-width:none;margin-bottom:24px}
.post-faq summary{font-size:16px;gap:16px}
.sources{font-size:14px}
.disclaimer{margin-top:40px;border:1px dashed var(--ink);border-radius:var(--r);padding:22px 24px;font-size:14px;line-height:1.65;background:#fafaf8}
.disclaimer h2{font-size:15px!important;margin:0 0 10px!important;text-transform:uppercase;letter-spacing:.08em}
.disclaimer p{margin-bottom:10px!important;color:#444}
@media (max-width:760px){
  .stat-strip{grid-template-columns:1fr 1fr}
  .stat-strip div:nth-child(2){border-right:0}
  .stat-strip div:nth-child(-n+2){border-bottom:1px solid var(--ink)}
  .prose table{font-size:13px}
  .prose th,.prose td{padding:8px 10px}
}
.prose .table-wrap:has(.cmp){width:min(1100px,calc(100vw - 32px));position:relative;left:50%;transform:translateX(-50%)}
.prose table.cmp{min-width:760px}
.prose table.cmp td,.prose table.cmp th{padding:10px 12px}
.tip{border-left:3px solid var(--ink);background:#fff;padding:16px 20px;margin:28px 0;border-radius:0 var(--r) var(--r) 0}
.tip strong{font-family:var(--mono);font-size:12px;text-transform:uppercase;letter-spacing:.1em}
.tip p{margin:6px 0 0!important}
.hub-list li{margin-bottom:10px}
.fm-series{border-bottom:1px solid var(--line)}