/* css/style.css - SALDOZEA BLACKHOLE EDITION */
:root {
  --space: #0a0a1f;
  --nebula: #1a1033;
  --accent: #00f7ff;
  --purple: #c724ff;
  --blackhole: #0f0f1f;
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: radial-gradient(circle at center, #1a1033 0%, #0a0a1f 70%);
  color: #fff;
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
}

/* Background stars */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: transparent url('https://i.ibb.co/0jZ7k3K/stars.png') repeat;
  opacity: 0.15;
  pointer-events: none;
  z-index: -1;
  animation: twinkle 8s infinite alternate;
}

/* Blackhole glow di pojok */
body::after {
  content: '';
  position: fixed;
  bottom: -30%;
  right: -30%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(199,36,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
  filter: blur(80px);
}

.header {
  background: linear-gradient(90deg, #0f0f1f, #1a1033);
  border-bottom: 1px solid rgba(0, 247, 255, 0.3);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 0 30px rgba(199, 36, 255, 0.4);
}

.card {
  background: rgba(26, 16, 51, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 247, 255, 0.2);
  border-radius: 20px;
  box-shadow: 0 0 40px rgba(199, 36, 255, 0.15);
}

.led-preview {
  background: #000;
  border: 3px solid #00f7ff;
  box-shadow: 
    0 0 30px #00f7ff,
    0 0 60px #c724ff;
  color: #fff;
  font-family: monospace;
  text-shadow: 0 0 15px #00f7ff;
}

.btn-neon {
  border: 2px solid var(--accent);
  color: var(--accent);
  transition: all 0.4s ease;
}

.btn-neon:hover {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 25px var(--accent);
}

@keyframes twinkle {
  from { opacity: 0.1; }
  to   { opacity: 0.3; }
}