:root{--ink:#0b1a28;--navy:#0f2a40;--deep:#081420;--paper:#f6f3ec;--card:#fff;--amber:#ffb43c;--heat:#ff6b35;--teal:#2fb59a;--mute:#5d6b78;--line:#e3ddd0;--r:18px;
--sans:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{line-height:1.12;margin:0 0 .5em;letter-spacing:-.02em}
h2{font-size:clamp(1.9rem,4.2vw,3.1rem)}
h3{font-size:1.2rem}
em{font-style:italic;color:var(--amber)}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:16px;z-index:99;background:#fff;padding:8px 12px}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.78rem;font-weight:700;color:var(--teal);margin:0 0 .8em}
.fine{font-size:.8rem;color:var(--mute)}
.btn{display:inline-block;background:var(--amber);color:var(--ink);font-weight:700;text-decoration:none;padding:.95em 1.6em;border-radius:999px;border:2px solid var(--amber);transition:transform .2s,box-shadow .2s,background .2s;cursor:pointer;font-size:1rem;font-family:inherit}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px -8px rgba(255,180,60,.7)}
.btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn.sm{padding:.55em 1.1em;font-size:.9rem}
.btn[disabled]{opacity:.6;cursor:progress}

/* nav */
.nav{position:fixed;inset:0 0 auto;z-index:50;display:flex;align-items:center;gap:20px;padding:14px clamp(16px,4vw,48px);color:#fff;transition:background .3s,box-shadow .3s,padding .3s}
.nav.solid{background:rgba(8,20,32,.92);backdrop-filter:blur(10px);box-shadow:0 6px 24px rgba(0,0,0,.25);padding-block:10px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand img{border-radius:50%;background:#fff}
.brand span{display:flex;flex-direction:column;line-height:1.1}.brand b{letter-spacing:.08em}.brand small{font-size:.72rem;opacity:.75}
.links{display:flex;gap:22px;align-items:center;margin-left:auto}
.links a:not(.btn){text-decoration:none;font-weight:600;font-size:.93rem;opacity:.9}
.links a:not(.btn):hover{color:var(--amber)}
.lang{display:flex;border:1px solid rgba(255,255,255,.35);border-radius:999px;overflow:hidden}
.lang button{background:none;border:0;color:#fff;font:600 .8rem var(--sans);padding:.45em .8em;cursor:pointer}
.lang button[aria-pressed=true]{background:#fff;color:var(--ink)}
.burger{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;flex-direction:column;justify-content:center;gap:6px}
.burger span{display:block;height:2px;background:#fff;transition:transform .3s}
.burger[aria-expanded=true] span:first-child{transform:translateY(4px) rotate(45deg)}
.burger[aria-expanded=true] span:last-child{transform:translateY(-4px) rotate(-45deg)}

/* hero */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;color:#fff;overflow:hidden;background:var(--deep)}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform:scale(1.05)}
.hero-shade{position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,20,32,.92) 0%,rgba(8,20,32,.65) 50%,rgba(8,20,32,.25) 100%),linear-gradient(0deg,rgba(8,20,32,.8),transparent 40%)}
.hero-in{position:relative;padding:120px clamp(16px,6vw,96px) 80px;max-width:820px}
.hero h1{font-size:clamp(2.6rem,7.5vw,5.6rem);font-weight:800}
.lead{font-size:clamp(1.05rem,1.8vw,1.3rem);opacity:.92;max-width:600px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.rise{opacity:0;transform:translateY(28px);animation:rise .9s cubic-bezier(.2,.7,.2,1) forwards}
.d1{animation-delay:.15s;transition-delay:.1s}.d2{animation-delay:.3s;transition-delay:.2s}.d3{animation-delay:.45s;transition-delay:.3s}
@keyframes rise{to{opacity:1;transform:none}}
.scroll-cue{position:absolute;bottom:28px;left:50%;width:26px;height:42px;border:2px solid rgba(255,255,255,.7);border-radius:14px;transform:translateX(-50%)}
.scroll-cue span{position:absolute;left:50%;top:8px;width:4px;height:8px;margin-left:-2px;background:#fff;border-radius:2px;animation:cue 1.6s infinite}
@keyframes cue{0%{opacity:0;transform:translateY(0)}40%{opacity:1}100%{opacity:0;transform:translateY(14px)}}

.ticker{background:var(--amber);color:var(--ink);overflow:hidden;white-space:nowrap;font-weight:800;letter-spacing:.08em;font-size:.85rem}
.ticker-track{display:inline-block;padding:12px 0;animation:tick 40s linear infinite}
.ticker-track span{padding:0 22px}
@keyframes tick{to{transform:translateX(-50%)}}

/* stats */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1100px;margin:0 auto;padding:64px clamp(16px,4vw,48px)}
.stats div{border-top:3px solid var(--ink);padding-top:14px}
.stats b{display:block;font-size:clamp(2.4rem,5vw,3.6rem);line-height:1;color:var(--navy)}
.stats span{color:var(--mute);font-size:.95rem}

/* reveal */
.reveal{opacity:0;transform:translateY(40px);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* insulation story */
.ins{background:var(--deep);color:#fff;padding:96px clamp(16px,4vw,48px)}
.ins-head{max-width:1100px;margin:0 auto 40px}
.ins-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;max-width:1200px;margin:0 auto}
.ins-sticky{position:sticky;top:90px;align-self:start}
#house{width:100%;height:auto;border-radius:var(--r);box-shadow:0 30px 60px -20px rgba(0,0,0,.6)}
.ins .fine{color:#9fb2c3;margin-top:10px}
.meter{height:6px;background:rgba(255,255,255,.12);border-radius:3px;overflow:hidden}
.meter i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--heat),var(--amber),var(--teal))}
.ins-steps{list-style:none;margin:0;padding:0}
.step{min-height:70vh;display:flex;flex-direction:column;justify-content:center;opacity:.28;transition:opacity .5s,transform .5s;transform:translateX(12px)}
.step.on{opacity:1;transform:none}
.step .num{font-weight:800;color:var(--amber);font-size:.9rem;letter-spacing:.1em}
.step h3{font-size:clamp(1.5rem,3vw,2.2rem);margin-top:.3em}
.step p{color:#c6d3de;font-size:1.05rem;max-width:460px}
#heatArrows .ha{stroke-dasharray:12 10;animation:flow 1.2s linear infinite}
@keyframes flow{to{stroke-dashoffset:-44}}
#rays line{animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{50%{opacity:.35}}

/* calc */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:48px;max-width:1100px;margin:0 auto;padding:96px clamp(16px,4vw,48px);align-items:center}
.calc-box{background:var(--card);border-radius:var(--r);padding:28px;box-shadow:0 20px 50px -24px rgba(11,26,40,.35);display:grid;gap:18px}
.calc-box label{font-weight:600}
.calc-box input[type=range]{width:100%;accent-color:var(--heat);margin-top:8px}
.calc-box output{font-weight:800;font-size:1.3rem;color:var(--heat)}
fieldset{border:0;padding:0;margin:0;min-width:0}
.calc-box fieldset{display:flex;flex-wrap:wrap;gap:8px}
legend{font-weight:600;margin-bottom:8px;width:100%;padding:0}
.chip input{position:absolute;opacity:0}
.chip span{display:inline-block;padding:.45em 1em;border:1.5px solid var(--line);border-radius:999px;font-weight:600;cursor:pointer;transition:all .2s}
.chip input:checked+span{background:var(--ink);color:#fff;border-color:var(--ink)}
.chip input:focus-visible+span{outline:3px solid var(--amber)}
.gauge{position:relative;height:18px;border-radius:9px;background:#eee7da;overflow:visible;margin:6px 0 10px}
.gauge-fill{height:100%;width:0;border-radius:9px;background:linear-gradient(90deg,var(--heat),var(--amber),var(--teal));transition:width .6s cubic-bezier(.2,.7,.2,1)}
.gauge-target{position:absolute;top:-6px;width:3px;height:30px;background:var(--ink);transition:left .6s}
.calc-out p{margin:0}

/* sections */
.sec-head{max-width:760px;margin:0 auto 40px;text-align:center}
.services,.programs,.tips{padding:96px clamp(16px,4vw,48px)}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1200px;margin:0 auto}
.card{background:var(--card);border-radius:var(--r);padding:28px;border:1px solid var(--line);transition:transform .3s,box-shadow .3s}
.card:hover{transform:translateY(-6px);box-shadow:0 24px 40px -20px rgba(11,26,40,.35)}
.card p{color:var(--mute);margin:0}
.ico{width:56px;height:56px;border-radius:14px;background:var(--ink);display:grid;place-items:center;margin-bottom:18px}
.ico svg{width:34px;height:34px;fill:none;stroke:var(--amber);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.ico .wave{stroke:var(--heat);animation:flow 1.4s linear infinite;stroke-dasharray:6 4}
.ico .spin{transform-origin:34px 32px;animation:spin 3s linear infinite;stroke-dasharray:4 3}
@keyframes spin{to{transform:rotate(360deg)}}
.ico .glow{stroke:#fff;animation:pulse 2s infinite}
.ico .check{stroke:var(--teal);stroke-dasharray:20;stroke-dashoffset:20}
.card.in .check{animation:draw 1s .6s forwards}
@keyframes draw{to{stroke-dashoffset:0}}

.band{position:relative;padding:140px clamp(16px,4vw,48px);color:#fff;text-align:center;background:var(--deep) var(--bg) center/cover fixed}
.band::before{content:"";position:absolute;inset:0;background:rgba(8,20,32,.7)}
.band-in{position:relative;max-width:820px;margin:0 auto}
.band h2{margin-bottom:28px}

.programs{background:#ece6da}
.prog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1200px;margin:0 auto}
.prog{background:var(--card);border-radius:var(--r);padding:28px;border-left:5px solid var(--teal)}
.prog p{color:var(--mute)}
.tag{display:inline-block;background:var(--ink);color:#fff;font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:.3em .8em;border-radius:999px;margin-bottom:12px}
.link{font-weight:700;color:var(--navy);text-decoration:none;border-bottom:2px solid var(--amber)}
.how{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1200px;margin:56px auto 0;padding:0;position:relative}
.how::before{content:"";position:absolute;top:22px;left:4%;height:3px;width:0;background:var(--heat);transition:width 1.6s cubic-bezier(.2,.7,.2,1) .2s}
.how.in::before{width:92%}
.how li{position:relative}
.how b{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:var(--ink);color:var(--amber);margin-bottom:14px;position:relative}
.how p{color:var(--mute);margin:0}

.tip-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1200px;margin:0 auto}
.tip{background:var(--card);border-radius:var(--r);padding:26px;border:1px solid var(--line)}
.tip b{display:block;font-size:2rem;color:var(--heat);line-height:1;margin-bottom:10px}
.tip p{color:var(--mute);margin:0}

/* apply / form */
.apply{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;max-width:1200px;margin:0 auto;padding:96px clamp(16px,4vw,48px)}
.contact{list-style:none;padding:0;font-weight:700;font-size:1.15rem}
.contact a{text-decoration:none;border-bottom:2px solid var(--amber)}
.form-card{background:var(--card);border-radius:var(--r);padding:clamp(20px,3vw,36px);box-shadow:0 30px 60px -30px rgba(11,26,40,.4)}
.skel{height:48px;border-radius:10px;background:linear-gradient(90deg,#eee 0,#f7f7f7 50%,#eee 100%);background-size:200% 100%;animation:sk 1.2s infinite;margin-bottom:14px}.skel.short{width:50%}
@keyframes sk{to{background-position:-200% 0}}
.f{margin-bottom:16px}
.f>label,.f legend{display:block;font-weight:600;margin-bottom:6px}
.f input[type=text],.f input[type=email],.f input[type=tel],.f input[type=url],.f input[type=number],.f input[type=date],.f select,.f textarea{width:100%;padding:.8em 1em;border:1.5px solid var(--line);border-radius:10px;font:inherit;background:#fcfbf8;transition:border-color .2s,box-shadow .2s}
.f input:focus,.f select:focus,.f textarea:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 4px rgba(47,181,154,.18)}
.f textarea{min-height:110px;resize:vertical}
.f [aria-invalid=true]{border-color:#c62828}
.f .opts{display:flex;flex-wrap:wrap;gap:8px}
.f .help{font-size:.82rem;color:var(--mute);margin:4px 0 0}
.err{color:#c62828;font-size:.85rem;margin:4px 0 0;min-height:0}
.req{color:var(--heat)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.form-err{background:#fdecea;color:#8a1c1c;padding:12px 14px;border-radius:10px;margin-bottom:14px}
.thanks{text-align:center;padding:30px 10px}
.thanks .tick{width:72px;height:72px;margin:0 auto 16px;border-radius:50%;background:var(--teal);display:grid;place-items:center;animation:pop .5s cubic-bezier(.2,1.6,.4,1)}
@keyframes pop{from{transform:scale(0)}}
.thanks svg{width:36px;stroke:#fff;fill:none;stroke-width:4;stroke-linecap:round;stroke-dasharray:40;stroke-dashoffset:40;animation:draw .6s .3s forwards}

.foot{background:var(--deep);color:#cfdbe5;padding:48px clamp(16px,4vw,48px)}
.foot-top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-bottom:18px}
.foot .fine{color:#8fa3b5;max-width:1000px}
.foot a{color:#fff}

@media (max-width:960px){
  .links{position:fixed;inset:64px 0 auto;flex-direction:column;align-items:flex-start;gap:0;padding:8px 20px 20px;background:rgba(8,20,32,.97);transform:translateY(-130%);transition:transform .35s}
  .links.open{transform:none}
  .links a{padding:12px 0;width:100%}
  .links .btn{margin-top:8px;width:auto}
  .burger{display:flex}
  .lang{margin-left:auto}
  .ins-grid,.calc,.apply{grid-template-columns:1fr}
  .ins-sticky{top:60px;z-index:2;background:var(--deep);padding:6px 0 8px}
  #house{max-height:38vh;width:auto;margin:0 auto}
  .ins .fine{text-align:center}
  .step{min-height:75vh;justify-content:flex-end;padding-bottom:12vh}
  .cards{grid-template-columns:1fr 1fr}
  .prog-grid,.tip-row,.how{grid-template-columns:1fr}
  .how::before{display:none}
  .band{background-attachment:scroll}
}
@media (max-width:560px){
  .brand small{display:none}
  .stats{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .two{grid-template-columns:1fr}
  .lang button{padding:.4em .55em}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.rise{opacity:1;transform:none}
  html{scroll-behavior:auto}
}