:root {
  --bg: #1f1f1e;
  --fg: #f5f4ee;
  --particle-rgb: 245, 244, 238;
}

body.inverted {
  --bg: #f5f4ee;
  --fg: #1f1f1e;
  --particle-rgb: 31, 31, 30;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'VT323', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  transition: background 0.4s ease, color 0.4s ease;
}

#cosmos {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.content {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.header {
  position: fixed;
  top: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.8rem);
  justify-content: center;
  white-space: nowrap;
}

.header > a:first-child {
  margin-right: clamp(0.4rem, 2vw, 1.4rem);
}

.header a {
  color: var(--fg);
  text-decoration: none;
  font-size: clamp(1rem, 3vw, 1.2rem);
  letter-spacing: 0.02em;
  transition: opacity 0.25s ease;
  opacity: 0.3;
}

.header > a:first-child {
  opacity: 1;
}

.header a.active {
  color: var(--fg);
  opacity: 1;
}

@media (hover: hover) {
  .header a:hover {
    color: var(--fg);
    opacity: 1;
  }
}

.logo {
  height: clamp(28px, 5.5vw, 36px);
  width: auto;
  display: block;
  cursor: pointer;
}

body.inverted .logo {
  filter: invert(1);
}