* {
  margin: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(160deg, #050608, #0a1422 60%, #0e1d33);
  font-family: system-ui, sans-serif;
}

.card {
  width: 400px;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  background: linear-gradient(160deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 0 80px rgba(59,130,246,0.06), 0 30px 80px rgba(0,0,0,0.7);
}

.content {
  padding: 44px 40px;
  text-align: center;
}

.shield {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.15);
  font-size: 28px;
  line-height: 64px;
  margin: 0 auto 20px;
}

h2 {
  font-size: 22px;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 6px;
}

.subtitle {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  margin-bottom: 32px;
}

.digits {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
}

.digits input {
  width: 46px;
  height: 54px;
  border-radius: 4px;
  border: 1px solid rgba(59,130,246,0.2);
  background: rgba(0,0,0,0.3);
  color: #93c5fd;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
}

.digits input:focus {
  outline: none;
  border-color: rgba(59,130,246,0.6);
  box-shadow: 0 0 15px rgba(59,130,246,0.2);
}

button {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #1d4ed8, #2563eb, #1d4ed8);
  background-size: 200% 200%;
  background-position: left center;
  cursor: pointer;
  transition: background-position 0.3s ease;
}

button:hover {
  background-position: right center;
}

.card::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 12px;
  width: 24px;
  height: 24px;
  border-top: 2px solid #3b82f6;
  border-left: 2px solid #3b82f6;
}

.card::after {
  content: "";
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 24px;
  height: 24px;
  border-bottom: 2px solid #3b82f6;
  border-right: 2px solid #3b82f6;
}