/* Gas Check landing page — layout & components. */

*{box-sizing:border-box;}

html,body{
  margin:0;
  padding:0;
  background:var(--surface-app);
  color:var(--text-body);
  font-family:var(--font-sans);
}

a{color:var(--primary);text-decoration:none;}
a:hover{color:var(--on-primary-container);}

.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 24px;
  max-width:1180px;
  width:100%;
  margin:0 auto;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--text-body);
}
.brand:hover{color:var(--text-body);}
.brand img{display:block;border-radius:8px;}
.brand span{font-size:18px;font-weight:700;letter-spacing:-.2px;}

.lang-switch{
  display:flex;
  align-items:center;
  gap:4px;
  background:var(--surface-container-highest);
  padding:3px;
  border-radius:20px;
}
.lang-switch a{
  border:none;
  cursor:pointer;
  font-family:inherit;
  font-size:12px;
  font-weight:500;
  letter-spacing:.5px;
  padding:6px 12px;
  border-radius:20px;
  color:var(--text-muted);
}
.lang-switch a:hover{
  background:var(--surface-container-high);
  color:var(--text-body);
}
.lang-switch a[aria-current="page"]{
  background:var(--primary);
  color:var(--on-primary);
}
.lang-switch a[aria-current="page"]:hover{
  background:var(--primary);
  color:var(--on-primary);
}

main{
  flex:1;
  max-width:1180px;
  width:100%;
  margin:0 auto;
  padding:8px 24px 0;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,400px),1fr));
  gap:48px;
  align-items:center;
}

body{min-height:100vh;display:flex;flex-direction:column;}

.hero-copy{
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:24px 0 40px;
}

h1{
  margin:0;
  font-size:clamp(34px,4.4vw,54px);
  line-height:1.06;
  font-weight:700;
  letter-spacing:-1.2px;
  text-wrap:balance;
}

.sub{
  margin:0;
  font-size:18px;
  line-height:1.5;
  color:var(--text-muted);
  max-width:34em;
}

.math-card{
  display:flex;
  flex-direction:column;
  gap:10px;
  background:var(--surface-card);
  border-radius:12px;
  box-shadow:var(--elevation-1);
  padding:16px 18px;
  max-width:460px;
}
.math-label{
  font-size:13px;
  font-weight:500;
  letter-spacing:.4px;
  text-transform:uppercase;
  color:var(--primary);
}
.math-example{
  font-family:var(--font-mono);
  font-size:17px;
  line-height:1.5;
  background:var(--surface-sunken);
  border-radius:10px;
  padding:12px 14px;
}
.math-example strong{color:var(--primary);font-weight:700;}
.math-note{
  font-size:13px;
  line-height:1.55;
  color:var(--text-muted);
}

.cta-row{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.cta{
  display:flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  border-radius:12px;
  font-size:15px;
  font-weight:500;
}
.cta-primary{
  background:var(--primary);
  color:var(--on-primary);
}
.cta-primary:hover{
  opacity:.9;
  color:var(--on-primary);
}
.cta-secondary{
  background:transparent;
  color:var(--text-body);
  border:1.5px solid var(--outline);
}
.cta-secondary:hover{
  background:var(--surface-container-high);
  color:var(--text-body);
}
.cta .material-symbols-outlined{font-size:20px;}

.privacy-note{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-size:13px;
  color:var(--text-muted);
}
.privacy-note .material-symbols-outlined{font-size:16px;}

.faq{
  display:flex;
  flex-direction:column;
  border-top:1px solid var(--border-hairline);
  margin-top:4px;
}
.faq details{
  border-bottom:1px solid var(--border-hairline);
  padding:12px 0;
}
.faq summary{
  cursor:pointer;
  font-size:15px;
  font-weight:500;
  list-style:none;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{
  content:'+';
  float:right;
  color:var(--text-muted);
}
.faq details[open] summary::after{content:'\2212';}
.faq .faq-answer{
  font-size:14px;
  line-height:1.6;
  color:var(--text-muted);
  padding-top:8px;
  max-width:46em;
}

.hero-shots{
  display:flex;
  justify-content:center;
  align-items:flex-end;
  gap:20px;
  padding:24px 0 40px;
}
.shot{
  width:46%;
  max-width:250px;
  border-radius:20px;
  box-shadow:0 12px 40px rgba(0,0,0,.22);
  display:block;
}
.shot-list{margin-bottom:36px;}

.site-footer{border-top:1px solid var(--border-hairline);}
.site-footer .footer-inner{
  max-width:1180px;
  margin:0 auto;
  padding:16px 24px;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:space-between;
  font-size:12px;
  color:var(--text-muted);
}

.material-symbols-outlined{
  font-family:var(--font-icons);
  font-weight:normal;
  font-style:normal;
  line-height:1;
  letter-spacing:normal;
  text-transform:none;
  display:inline-block;
  white-space:nowrap;
  word-wrap:normal;
  direction:ltr;
  vertical-align:middle;
}