:root{
  --ink:#0B2530;
  --petrol:#0B4F5C;
  --petrol-dark:#083A44;
  --teal:#12798C;
  --amber:#F2994A;
  --amber-dark:#D97D2E;
  --paper:#F7F5F0;
  --line:rgba(11,37,48,0.12);
  --muted:#4F6B72;
  --good:#1E8E5A;
  --bad:#C94A3B;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
}
a{color:var(--teal);text-decoration:none;}
a:hover{text-decoration:underline;}
code{
  background:#fff;
  border:1px solid var(--line);
  padding:2px 6px;
  border-radius:4px;
  font-size:0.92em;
}
header.hero{
  background:linear-gradient(135deg,var(--petrol) 0%,var(--petrol-dark) 100%);
  color:#fff;
  padding:64px 24px 72px;
}
.wrap{max-width:820px;margin:0 auto;padding:0 20px;}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:36px;
}
.brand svg{width:36px;height:36px;flex-shrink:0;}
.brand span{
  font-weight:700;
  font-size:1.15rem;
  letter-spacing:0.02em;
}
.brand .dot{color:var(--amber);}
.brand a{color:inherit;display:flex;align-items:center;gap:12px;}
.brand a:hover{text-decoration:none;opacity:0.9;}
h1{
  font-size:2.1rem;
  line-height:1.25;
  margin:0 0 14px;
  font-weight:800;
}
header.hero p.lede{
  font-size:1.1rem;
  color:#DCEEF0;
  max-width:560px;
  margin:0;
}
main{max-width:820px;margin:-40px auto 0;padding:0 20px 80px;}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:14px;
  padding:32px 36px;
  margin-bottom:28px;
  box-shadow:0 8px 24px rgba(11,37,48,0.06);
}
.card h2{
  font-size:1.3rem;
  margin:0 0 16px;
  color:var(--petrol-dark);
}
.dns-block{
  background:var(--ink);
  color:#E9F3F3;
  border-radius:10px;
  padding:20px 22px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:0.92rem;
  overflow-x:auto;
  line-height:1.9;
}
.dns-block .field{color:#7FD1C9;}
.dns-block .val{color:var(--amber);}
ul{padding-left:1.3em;}
li{margin-bottom:8px;}
details{
  border-bottom:1px solid var(--line);
  padding:14px 0;
}
details:last-child{border-bottom:none;}
summary{
  cursor:pointer;
  font-weight:600;
  color:var(--petrol-dark);
  list-style:none;
  position:relative;
  padding-right:24px;
}
summary::-webkit-details-marker{display:none;}
summary::after{
  content:"+";
  position:absolute;
  right:0;
  top:0;
  color:var(--amber-dark);
  font-weight:700;
  font-size:1.1em;
}
details[open] summary::after{content:"–";}
details p{margin:10px 0 0;color:var(--muted);}
.badges{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:8px;
}
.badge{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 14px;
  font-size:0.85rem;
  color:var(--petrol-dark);
  font-weight:600;
}
footer{
  text-align:center;
  padding:36px 20px 48px;
  color:var(--muted);
  font-size:0.88rem;
}
footer a{color:var(--muted);text-decoration:underline;}
.disclaimer{
  font-size:0.78rem;
  color:var(--muted);
  max-width:640px;
  margin:18px auto 0;
  line-height:1.7;
}

/* --- Checker page specific --- */
.check-form{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}
.check-form input[type="text"]{
  flex:1 1 260px;
  padding:12px 14px;
  border:1px solid var(--line);
  border-radius:8px;
  font-size:1rem;
  font-family:inherit;
  color:var(--ink);
}
.check-form input[type="text"]:focus{
  outline:2px solid var(--teal);
  outline-offset:1px;
}
.btn{
  background:var(--petrol);
  color:#fff;
  border:none;
  padding:12px 22px;
  border-radius:8px;
  font-size:1rem;
  font-weight:600;
  cursor:pointer;
  font-family:inherit;
}
.btn:hover{background:var(--petrol-dark);}
.btn:disabled{background:var(--muted);cursor:not-allowed;}
.btn.secondary{
  background:transparent;
  color:var(--petrol);
  border:1px solid var(--line);
}
.btn.secondary:hover{background:var(--paper);}
.result-list{
  margin-top:22px;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.result-row{
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:14px 16px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--paper);
}
.result-icon{
  flex-shrink:0;
  width:22px;
  height:22px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:0.85rem;
  font-weight:800;
  color:#fff;
  margin-top:2px;
}
.result-icon.pass{background:var(--good);}
.result-icon.fail{background:var(--bad);}
.result-icon.pending{background:var(--muted);}
.result-body strong{display:block;margin-bottom:2px;}
.result-body span.detail{color:var(--muted);font-size:0.9rem;word-break:break-all;}
.status-banner{
  margin-top:20px;
  padding:16px 18px;
  border-radius:10px;
  font-weight:700;
  display:none;
}
.status-banner.show{display:block;}
.status-banner.ok{background:rgba(30,142,90,0.12);color:var(--good);}
.status-banner.error{background:rgba(201,74,59,0.12);color:var(--bad);}
.hint{color:var(--muted);font-size:0.9rem;margin-top:14px;}