:root{
  --bg:#0b0b0b;
  --text:#bfe27a;
  --muted:#7a7a7a;
  --accent:#5cff5c;
  --card-bg:#060606;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", "Courier New", monospace;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.center{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:2rem;
}

.card{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  border:1px solid rgba(255,255,255,0.04);
  padding:2rem 2.5rem;
  border-radius:8px;
  box-shadow:0 6px 18px rgba(0,0,0,0.6);
  text-align:center;
  max-width:420px;
}

.sr{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}

.link-btn{
  display:inline-block;
  margin-top:1rem;
  padding:0.85rem 1.4rem;
  color:var(--bg);
  background:var(--accent);
  text-decoration:none;
  border-radius:6px;
  font-weight:600;
  letter-spacing:0.02em;
  border:1px solid rgba(0,0,0,0.25);
  transition:transform .08s ease, box-shadow .08s ease;
}
.link-btn:active{transform:translateY(1px)}
.link-btn:hover{box-shadow:0 6px 18px rgba(92,255,92,0.06)}

.hint{
  margin:0.8rem 0 0;
  color:var(--muted);
  font-size:0.9rem;
}

@media (prefers-reduced-motion:reduce){
  .link-btn{transition:none}
}

/* 备案（底部小徽章） */
.site-footer{
  position:fixed;
  left:0;right:0;bottom:12px;
  display:flex;
  justify-content:center;
  pointer-events:none; /* allow clicks only on inner link */
}
.beian-link{
  pointer-events:auto;
  background:rgba(255,255,255,0.02);
  color:var(--muted);
  padding:0.28rem 0.6rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,0.03);
  font-size:0.85rem;
  text-decoration:none;
  box-shadow:0 4px 10px rgba(0,0,0,0.45);
  transition:transform .12s ease, color .12s ease, background .12s ease;
}
.beian-link:hover{
  transform:translateY(-2px);
  color:var(--text);
  background:linear-gradient(180deg, rgba(92,255,92,0.06), rgba(92,255,92,0.02));
}

@media (max-width:420px){
  .site-footer{bottom:8px}
  .beian-link{font-size:0.8rem;padding:0.22rem 0.5rem}
}