*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  background: #0d0f13;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #e2e8f0;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}
.card {
  background: #161a22;
  border: 1px solid #252b38;
  border-radius: 16px;
  padding: 48px 40px 40px;
  width: 100%;
  max-width: 380px;
  text-align: center;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
}
.icon {
  width: 56px;
  height: 56px;
  background: #1a2535;
  border: 1px solid #253045;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.icon svg { color: #3b82f6; }
h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: -0.3px;
  margin-bottom: 28px;
}
.subtitle {
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 32px;
}
#btn {
  display: flex;
  justify-content: center;
  min-height: 44px;
}
#err {
  margin-top: 18px;
  padding: 10px 14px;
  background: #2d1a1a;
  border: 1px solid #5c2626;
  border-radius: 8px;
  color: #f87171;
  font-size: 0.82rem;
  display: none;
}
#err.visible { display: block; }
.footer {
  margin-top: 28px;
  font-size: 0.85rem;
}
.pub-link {
  color: #3b82f6;
  text-decoration: none;
  font-weight: 500;
}
.pub-link:hover { text-decoration: underline; }