*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg-start: #0f172a;
  --bg-end: #1e293b;
  --accent: #38bdf8;
  --text: #f8fafc;
  --muted: #94a3b8;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #1e3a8a 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, #312e81 0%, transparent 50%),
              linear-gradient(135deg, var(--bg-start), var(--bg-end));
  background-attachment: fixed;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.card {
  max-width: 560px;
  width: 100%;
  padding: 3rem 2.5rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  text-align: center;
  animation: fadeIn 0.8s ease-out;
}

.badge {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0;
}

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
  margin: 2rem 0 1.5rem;
}

.footer {
  font-size: 0.85rem;
  color: var(--muted);
  opacity: 0.7;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}