body.alfa-page {
  background: linear-gradient(135deg, #2d0a4a 0%, #5b1a8a 50%, #2d0a4a 100%);
  background-image:
    linear-gradient(135deg, #2d0a4a 0%, #5b1a8a 50%, #2d0a4a 100%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='5'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.06 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-blend-mode: normal, overlay;
  color: var(--noir-paper);
}

body.alfa-page::before {
  background: radial-gradient(ellipse at center, transparent 35%, rgba(0, 0, 0, 0.5) 100%);
}

.alfa-board {
  width: 100%;
  max-width: 480px;
  text-align: center;
  padding: 2rem 1.25rem;
  position: relative;
  z-index: 2;
}

.alfa-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 8vw, 4rem);
  text-align: center;
  letter-spacing: 0.4em;
  color: #fff;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.55);
  padding: 1rem 0.5rem;
  margin-bottom: 1.5rem;
  font-weight: bold;
  caret-color: var(--noir-gold);
}

.alfa-input::placeholder {
  color: rgba(255, 255, 255, 0.25);
  letter-spacing: 0.4em;
}

.alfa-input:focus {
  border-color: var(--noir-gold);
  background: rgba(255, 255, 255, 0.04);
}

.alfa-input::-webkit-outer-spin-button,
.alfa-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.alfa-input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}

.alfa-check-btn {
  font-family: var(--font-mono);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 1rem 2.25rem;
  background: rgba(255, 255, 255, 0.95);
  color: #2d0a4a;
  border: 2px solid #fff;
  font-weight: bold;
  transition: background 0.15s ease, transform 0.15s ease;
  width: 100%;
  max-width: 280px;
}

.alfa-check-btn:hover,
.alfa-check-btn:active {
  background: var(--noir-gold);
  border-color: var(--noir-gold);
  transform: scale(1.02);
}

.alfa-feedback {
  min-height: 1.5rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: #ffb3b3;
}

.alfa-reveal {
  display: none;
  flex-direction: column;
  align-items: center;
}

.alfa-reveal.active {
  display: flex;
  animation: reveal-pop 0.9s ease-out;
}

.alfa-reveal-title {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 4vw, 1.75rem);
  letter-spacing: 0.18em;
  margin-bottom: 1rem;
  color: #fff;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.4);
}

.alfa-reveal-cipher {
  font-size: clamp(8rem, 25vw, 18rem);
  font-family: var(--font-mono);
  color: var(--noir-gold);
  text-shadow: 0 0 50px rgba(201, 169, 97, 0.55), 0 6px 0 rgba(0, 0, 0, 0.4);
  line-height: 1;
  font-weight: bold;
}

.shake {
  animation: shake 0.4s ease-in-out;
}

.hidden {
  display: none !important;
}