*{box-sizing:border-box}
body{
  margin:0;
  min-height:100vh;
  font-family:Arial,Helvetica,sans-serif;
  color:#fff;
  background:
    linear-gradient(90deg,rgba(3,8,24,.94),rgba(4,16,48,.88),rgba(3,8,24,.96)),
    url('assets/priority-mail-bg.png') center/cover no-repeat;
}
.error-page{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:48px 20px;
}
.error-card{
  width:min(1040px,94vw);
  border:1px solid rgba(255,216,77,.32);
  background:linear-gradient(180deg,rgba(2,10,32,.82),rgba(1,5,18,.92));
  box-shadow:0 35px 110px rgba(0,0,0,.62);
  border-radius:34px;
  padding:54px;
  position:relative;
  overflow:hidden;
}
.badge{
  display:inline-block;
  padding:10px 18px;
  border-radius:999px;
  border:1px solid rgba(255,216,77,.36);
  color:#ffd84d;
  font-weight:900;
  letter-spacing:2px;
  text-transform:uppercase;
  font-size:12px;
  background:rgba(255,255,255,.05);
  margin-bottom:24px;
}
.code{
  font-size:clamp(82px,14vw,170px);
  line-height:.9;
  font-weight:1000;
  background:linear-gradient(180deg,#fff,#35c7ff 45%,#ffd84d 75%,#fff);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  margin:0 0 12px;
}
h1{
  font-size:clamp(34px,5vw,64px);
  line-height:1.05;
  margin:0 0 20px;
  text-transform:uppercase;
}
p{
  color:#c9d8f5;
  font-size:20px;
  line-height:1.7;
  max-width:820px;
  margin:0 0 20px;
}
.actions{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin-top:34px;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:16px 28px;
  border-radius:999px;
  background:linear-gradient(180deg,#fff36a,#ffbf00);
  color:#07123c;
  font-size:17px;
  font-weight:1000;
  text-decoration:none;
  box-shadow:0 14px 35px rgba(255,191,0,.28);
  border:1px solid rgba(255,255,255,.35);
}
.btn.secondary{
  background:rgba(255,255,255,.06);
  color:#fff;
  border:1px solid rgba(255,216,77,.36);
  box-shadow:none;
}
.quick-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
  margin-top:36px;
}
.quick{
  padding:20px;
  border-radius:22px;
  border:1px solid rgba(255,216,77,.22);
  background:rgba(255,255,255,.045);
}
.quick strong{
  display:block;
  color:#ffd84d;
  margin-bottom:6px;
  font-size:18px;
}
.quick span{
  color:#d9e5ff;
  font-size:14px;
  line-height:1.5;
}
.footer-note{
  margin-top:34px;
  font-size:13px;
  color:#98acd4;
}
@media(max-width:800px){
  .error-card{padding:34px 24px}
  .quick-grid{grid-template-columns:1fr}
  .actions{flex-direction:column}
  .btn{width:100%}
}