:root {
  --bg: #070a12;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #8b5cf6;
  --border: rgba(148, 163, 184, 0.14);
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: grid;
  place-items: center;
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 45% at 50% -5%, rgba(139, 92, 246, 0.22), transparent 55%),
    radial-gradient(ellipse 50% 35% at 100% 100%, rgba(59, 130, 246, 0.08), transparent 50%);
}

.gate { position: relative; z-index: 1; width: min(100% - 2rem, 22rem); }

.card {
  padding: 1.75rem 1.5rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(18, 24, 38, 0.85);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  text-align: center;
}

.logo {
  width: 2.75rem;
  height: 2.75rem;
  margin: 0 auto 0.85rem;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid rgba(139, 92, 246, 0.45);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.28), rgba(59, 130, 246, 0.12));
  color: #c4b5fd;
  font-size: 1.25rem;
}

h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 650;
}

.lede {
  margin: 0.35rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

form { display: grid; gap: 0.75rem; }

#pin {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.75);
  color: var(--text);
  font-size: 1.35rem;
  letter-spacing: 0.35em;
  text-align: center;
}

#pin:focus {
  outline: none;
  border-color: rgba(139, 92, 246, 0.65);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.18);
}

#go {
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(135deg, #7c3aed, #4f46e5);
  color: white;
  font-weight: 600;
  cursor: pointer;
}

#go:hover { filter: brightness(1.08); }
#go:disabled { opacity: 0.6; cursor: wait; }

.err {
  margin: 0.85rem 0 0;
  color: var(--danger);
  font-size: 0.85rem;
}