:root {
  --glow-cyan: #00ffff;
  --glow-magenta: #ff00ff;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: radial-gradient(ellipse at center, #000011 0%, #000000 100%);
  font-family: 'Orbitron', sans-serif;
}

canvas, #shader {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 2;
  opacity: 0;
}

.glitch {
  font-size: 8vw;
  color: var(--glow-cyan);
  position: relative;
  animation: flicker 2s infinite;
  white-space: nowrap;
  text-shadow:
    0 0 5px var(--glow-cyan),
    0 0 20px var(--glow-magenta),
    0 0 30px var(--glow-cyan),
    0 0 60px var(--glow-magenta);
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  width: 100%;
  overflow: hidden;
  color: var(--glow-magenta);
}

.glitch::before { left: 2px; animation: glitch-before 1s infinite; }
.glitch::after { left: -2px; animation: glitch-after 1.5s infinite; }

@keyframes flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: 0.4; }
}

@keyframes glitch-before {
  0% { clip: rect(0, 900px, 0, 0); }
  10% { clip: rect(10px, 900px, 30px, 0); }
  20% { clip: rect(40px, 900px, 60px, 0); }
}

@keyframes glitch-after {
  0% { clip: rect(80px, 900px, 100px, 0); }
  10% { clip: rect(50px, 900px, 70px, 0); }
  20% { clip: rect(30px, 900px, 50px, 0); }
}

.subtitle {
  color: #ffffffcc;
  font-size: 4vw;
  margin-top: 1rem;
  animation: subtitleFadeIn 2.5s ease-in-out;
}

@keyframes subtitleFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.countdown {
  margin-top: 2rem;
  font-size: 2.5vw;
  color: var(--glow-cyan);
  text-shadow: 0 0 10px var(--glow-magenta);
}

.enter-btn {
  margin-top: 3rem;
  padding: 0.8rem 2.5rem;
  font-size: 1.5rem;
  border: none;
  background: var(--glow-cyan);
  color: black;
  border-radius: 6px;
  cursor: pointer;
  animation: pulse 2s infinite;
  box-shadow: 0 0 10px var(--glow-cyan), 0 0 30px var(--glow-magenta);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@media (max-width: 768px) {
  .glitch { font-size: 12vw; }
  .subtitle { font-size: 6vw; }
}

.access-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
}

.access-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.access-overlay #accessText {
  font-size: 3vw;
  color: red;
  text-shadow:
    0 0 10px red,
    0 0 20px red,
    0 0 40px #ff0044;
  font-family: 'Orbitron', sans-serif;
  animation: glowFlicker 2s infinite;
}

.access-overlay.granted #accessText {
  color: lime;
  text-shadow:
    0 0 10px lime,
    0 0 20px lime,
    0 0 40px #00ff88;
}

@keyframes glowFlicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.hidden {
  display: none;
}