:root{
  --yellow:#f5c84b;
  --dark:#2a2a2a;
  --muted:#666;
  --border:#f2b800;
  --btn:#ffffff;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--dark);
  background:#fff;
}
.container{
  width:min(1100px, calc(100% - 56px));
  margin:0 auto;
}
.section{padding:56px 0;}
.section.yellow{background:var(--yellow);}
.section.white{background:#fff url("../images/paper.jpg") center/cover no-repeat;}
.section.tight{padding:42px 0;}

.topbar{
  position:sticky;
  top:0;
  z-index:20;
  background:var(--yellow);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 0;
}
.brand{display:flex; align-items:center; gap:10px;}
.brand img{width:34px;height:34px;}
.menu{
  display:flex;
  gap:28px;
  align-items:center;
  font-weight:800;
  letter-spacing:.4px;
  font-size:13px;
}
.menu a{color:var(--dark); text-decoration:none;}
.menu a:hover{text-decoration:underline;}
.plane{
  width:20px;height:20px;
  border:2px solid rgba(0,0,0,.35);
  border-left:none;border-bottom:none;
  transform:rotate(45deg);
  border-radius:2px;
}

.hero{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap:30px;
  align-items:center;
  padding:40px 0 26px;
}
.hero h1{margin:0 0 14px; font-size:44px; letter-spacing:.5px;}
.hero p{
  margin:0 0 18px;
  color:#3c3c3c;
  max-width:560px;
  font-size:12px;
  line-height:1.65;
}
.actions{display:flex; gap:14px; align-items:center;}
.btn{
  appearance:none;
  border:none;
  border-radius:999px;
  padding:10px 16px;
  font-weight:800;
  font-size:12px;
  cursor:pointer;
}
.btn.primary{
  background:var(--btn);
  color:var(--dark);
  box-shadow:0 1px 0 rgba(0,0,0,.12);
}
.btn.link{background:transparent; color:var(--dark);}
.btn.link span{font-weight:900; padding-left:6px;}

.hero-art{display:flex; justify-content:flex-end;}
.hero-art img{width:min(430px, 70vw); height:auto;}

.eco{
  display:grid;
  grid-template-columns: 1fr 1.1fr;
  gap:28px;
  align-items:start;
}
.eco-left{padding-left:60px;}
.eco-item{
  display:flex;
  gap:14px;
  align-items:center;
  margin:18px 0;
  font-weight:900;
  letter-spacing:.3px;
}
.ico{
  width:34px;height:34px;
  border:3px solid #000;
  border-radius:50%;
  display:grid;
  place-items:center;
}
.ico.flame{
  border-radius:12px;
  transform:rotate(45deg);
  border-width:0;
  background:#000;
  width:18px;height:18px;
}
.ico.chart{border-radius:6px;}
.eco-right h2{margin:6px 0 10px; font-size:20px; letter-spacing:.3px;}
.eco-right p{margin:0; color:var(--muted); font-size:12px; line-height:1.65;}

.stats{
  margin-top:26px;
  border:2px solid var(--border);
  border-radius:8px;
  display:grid;
  grid-template-columns: 1fr 1fr 1fr;
  overflow:hidden;
  background:#fff;
}
.stat{
  padding:18px 16px;
  text-align:center;
  font-weight:900;
  border-right:2px solid rgba(242,184,0,.45);
}
.stat:last-child{border-right:none;}
.stat small{
  display:block;
  font-weight:800;
  color:var(--border);
  margin-top:6px;
}

.howto-head{text-align:center;}
.howto-head .k{
  display:flex;
  justify-content:center;
  gap:18px;
  align-items:center;
  margin-bottom:14px;
}
.howto-head .k img{width:44px;height:44px;}
.howto-head .sub{font-size:14px; letter-spacing:.2px; opacity:.85;}
.howto-head h2{margin:6px 0 14px; font-size:54px; letter-spacing:1px;}
.howto-head p{
  margin:0 auto 18px;
  max-width:700px;
  color:#3d3d3d;
  font-size:12px;
  line-height:1.65;
}
.howto-actions{display:flex; justify-content:center; gap:14px;}

.steps{padding:22px 0 0; text-align:center;}
.step{
  display:grid;
  grid-template-columns: 140px 1fr;
  gap:16px;
  align-items:center;
  margin:34px auto;
  width:min(680px, 100%);
}
.step .icon{display:flex; justify-content:center;}
.step .icon img{max-width:120px; height:auto;}
.step h3{margin:0 0 6px; font-size:18px;}
.step p{margin:0; color:var(--muted); font-size:12px; line-height:1.55; text-align:left;}
.chev{display:flex; justify-content:center; margin:8px 0 -10px;}
.chev img{width:62px; height:auto; opacity:.9;}

.end{
  text-align:center;
  font-weight:900;
  letter-spacing:.6px;
  padding:34px 0 18px;
}
.social{display:flex; justify-content:center; gap:14px; margin:16px 0 34px;}
.pill{
  background:#2a86d1;
  color:#fff;
  font-weight:900;
  font-size:12px;
  padding:9px 14px;
  border-radius:4px;
}
.pill.alt{background:#1fa0d6;}
.footer{
  text-align:center;
  color:#777;
  font-size:12px;
  padding:12px 0 40px;
}

@media (max-width: 900px){
  .hero{grid-template-columns:1fr;}
  .hero-art{justify-content:center;}
  .eco{grid-template-columns:1fr;}
  .eco-left{padding-left:0;}
  .howto-head h2{font-size:40px;}
  .step{grid-template-columns: 1fr; text-align:center;}
  .step p{text-align:center;}
}