:root{
  --red-deep: #2b0000;
  --red-700: #8b0000;
  --red-600: #c20000;
  --red-400: #ff4d4d;
  --black: #0b0b0b;
  --white: #ffffff;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, var(--red-deep) 0%, var(--black) 60%);
  color:var(--white);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}

.center{
  width:100%;
  max-width:920px;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:60vh;
}

.card{
  text-align:center;
  padding:48px 32px;
  border-radius:16px;
  background: linear-gradient(180deg, rgba(0,0,0,0.35), rgba(0,0,0,0.6));
  box-shadow: 0 10px 30px rgba(0,0,0,0.6), 0 2px 6px rgba(194,0,0,0.12);
  border: 1px solid rgba(255,255,255,0.03);
}

.code{
  font-size:clamp(48px, 12vw, 160px);
  margin:0;
  line-height:0.85;
  font-weight:900;
  color:var(--red-400);
  text-shadow: 0 6px 24px rgba(194,0,0,0.25), 0 2px 6px rgba(0,0,0,0.6);
  letter-spacing: -4px;
}

.title{
  margin:12px 0 6px;
  font-size:clamp(18px, 2.4vw, 28px);
  color:var(--white);
  font-weight:700;
}

.desc{
  margin:0 0 18px;
  color:rgba(255,255,255,0.85);
  font-size:clamp(14px, 1.6vw, 16px);
}

.home{
  display:inline-block;
  padding:12px 20px;
  border-radius:10px;
  background:linear-gradient(180deg,var(--red-600),var(--red-700));
  color:var(--white);
  text-decoration:none;
  font-weight:700;
  box-shadow: 0 6px 18px rgba(139,0,0,0.25);
  transition:transform .12s ease, box-shadow .12s ease, opacity .12s ease;
}

.home:hover{ transform:translateY(-2px); box-shadow: 0 10px 26px rgba(139,0,0,0.32); opacity:0.98 }

@media (max-width:520px){
  .card{ padding:28px 18px; border-radius:12px; }
  .code{ letter-spacing: -2px; }
}