:root {
  --bg: #020604;
  --bg-deep: #010201;
  --green: #86ff7a;
  --green-bright: #b9ffb1;
  --green-soft: rgba(134, 255, 122, 0.46);
  --green-faint: rgba(134, 255, 122, 0.12);
  --white: #f2fff1;
  --font-display: "Orbitron", system-ui, sans-serif;
  --font-mono: Consolas, "SFMono-Regular", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 8%, rgba(134, 255, 122, 0.12), transparent 26%),
    radial-gradient(circle at 90% 85%, rgba(134, 255, 122, 0.08), transparent 28%),
    linear-gradient(180deg, #020604 0%, #010301 100%);
  color: var(--white);
  overflow: hidden;
  position: relative;
}

#matrix,
.vignette,
.noise,
.scanline {
  position: fixed;
  inset: 0;
}

#matrix {
  z-index: 0;
  width: 100vw;
  height: 100vh;
  opacity: 0.78;
}

.vignette {
  z-index: 1;
  background:
    radial-gradient(circle at center, transparent 42%, rgba(0, 0, 0, 0.34) 76%, rgba(0, 0, 0, 0.64) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.44));
  pointer-events: none;
}

.noise,
.scanline {
  pointer-events: none;
}

.noise {
  z-index: 3;
  opacity: 0.045;
  mix-blend-mode: screen;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.88' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scanline {
  z-index: 4;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0) 0,
    rgba(255,255,255,0) 2px,
    rgba(134,255,122,0.035) 3px,
    rgba(255,255,255,0) 4px
  );
  animation: scan-drift 10s linear infinite;
}

.site-header {
  position: relative;
  z-index: 5;
  padding: 22px 24px;
}

.brand {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--green-bright);
  text-decoration: none;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  line-height: 1;
  user-select: none;
  transition: transform 180ms ease, filter 180ms ease, letter-spacing 180ms ease;
  animation: idle-float 4.5s ease-in-out infinite, signal-flicker 5.5s infinite steps(1, end);
}

.brand::before,
.brand::after {
  content: "";
  position: absolute;
  inset: -10px -12px;
  border: 1px solid rgba(134, 255, 122, 0.14);
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 180ms ease, transform 180ms ease;
}

.brand::after {
  inset: -16px -18px;
  border-color: rgba(134, 255, 122, 0.08);
}

.brand:hover,
.brand:focus-visible {
  transform: translateY(-1px);
  filter: drop-shadow(0 0 7px rgba(134, 255, 122, 0.5)) drop-shadow(0 0 18px rgba(134, 255, 122, 0.2));
  letter-spacing: 0.21em;
  outline: none;
}

.brand:hover::before,
.brand:hover::after,
.brand:focus-visible::before,
.brand:focus-visible::after {
  opacity: 1;
  transform: scale(1);
}

.brand-bracket {
  display: inline-block;
  color: var(--green);
  text-shadow: 0 0 8px rgba(134, 255, 122, 0.35);
  transition: transform 180ms ease, opacity 180ms ease;
}

.brand:hover .brand-bracket.left,
.brand:focus-visible .brand-bracket.left {
  transform: translateX(-4px);
}

.brand:hover .brand-bracket.right,
.brand:focus-visible .brand-bracket.right {
  transform: translateX(4px);
}

.brand-stack {
  position: relative;
  display: inline-grid;
  place-items: center start;
}

.brand-text {
  grid-area: 1 / 1;
  font-weight: 700;
  color: var(--green-bright);
  text-shadow:
    0 0 3px rgba(185,255,177,0.45),
    0 0 9px rgba(134,255,122,0.4),
    0 0 22px rgba(134,255,122,0.14);
}

.brand-text.ghost {
  color: rgba(134,255,122,0.38);
  transform: translate(1px, -1px);
  mix-blend-mode: screen;
  opacity: 0.85;
  animation: glitch-ghost 2.8s infinite steps(1, end);
}

.brand:hover .brand-text,
.brand:focus-visible .brand-text {
  animation: hover-glitch 420ms steps(2, end) 1;
}

@keyframes idle-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-1px); }
}

@keyframes signal-flicker {
  0%, 84%, 100% { opacity: 1; }
  85% { opacity: 0.92; }
  86% { opacity: 1; }
  87% { opacity: 0.95; }
  88% { opacity: 1; }
}

@keyframes glitch-ghost {
  0%, 76%, 100% {
    transform: translate(1px, -1px);
    opacity: 0.82;
  }
  77% {
    transform: translate(3px, 0px);
    opacity: 0.45;
  }
  78% {
    transform: translate(-2px, 1px);
    opacity: 0.75;
  }
  79% {
    transform: translate(1px, -1px);
    opacity: 0.82;
  }
}

@keyframes hover-glitch {
  0% {
    transform: translate(0, 0);
    filter: none;
  }
  20% {
    transform: translate(-1px, 0);
    filter: brightness(1.2);
  }
  40% {
    transform: translate(2px, -1px);
    filter: brightness(1.05);
  }
  60% {
    transform: translate(-1px, 1px);
    filter: brightness(1.3);
  }
  100% {
    transform: translate(0, 0);
    filter: none;
  }
}

@keyframes scan-drift {
  0% { transform: translateY(0); }
  100% { transform: translateY(12px); }
}

@media (max-width: 640px) {
  .site-header {
    padding: 18px 18px;
  }

  .brand {
    gap: 8px;
    font-size: 0.85rem;
    letter-spacing: 0.14em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .brand,
  .brand-text.ghost,
  .scanline {
    animation: none !important;
  }

  .brand,
  .brand::before,
  .brand::after,
  .brand-bracket {
    transition: none !important;
  }
}