body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(900px 450px at 5% -10%, rgba(249, 229, 50, .18) 0%, transparent 60%),
    radial-gradient(900px 450px at 100% 0%, rgba(68, 68, 68, .1) 0%, transparent 60%),
    #e0e0e0;
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.card {
  width: min(560px, 92vw);
  border: 1px solid rgba(68, 68, 68, 0.22);
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 14px 30px rgba(68, 68, 68, .16);
  animation: fadeIn .45s ease both;
}
.title { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.muted { color: #444; font-size: 14px; margin-bottom: 14px; line-height: 1.5; }
.btn {
  display: inline-block;
  text-decoration: none;
  border: 1px solid rgba(68,68,68,.38);
  cursor: pointer;
  background: linear-gradient(135deg, #f9e532, #f9e532);
  color: #000;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  transition: transform .16s ease, box-shadow .16s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 20px rgba(68,68,68,.16); }
.row { margin-top: 12px; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }