@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("/assets/fonts/ibm-plex-sans-latin.woff2") format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin.woff2") format("woff2");
}

:root {
  --void: #000000;
  --ink: #f2f5f2;
  --muted: rgba(242, 245, 242, 0.62);
  --neon: #39ff14;
  --cyan: #00d4ff;
  --focus: #c44dff;
  --line: rgba(242, 245, 242, 0.16);
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(36% 48% at 42% 48%, rgba(0, 212, 255, 0.2), transparent 62%),
    radial-gradient(24% 32% at 36% 62%, rgba(57, 255, 20, 0.08), transparent 58%);
}

::selection { background: rgba(57, 255, 20, 0.35); color: #fff; }

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #9eecff; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.home {
  color: var(--neon);
  text-transform: uppercase;
  font-weight: 600;
}

.home:hover { color: #b8ffb8; }

.langs { color: var(--muted); }
.langs button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  cursor: pointer;
}
.langs button[aria-pressed="true"] { color: var(--neon); }
.langs .sep { margin: 0 0.35rem; color: rgba(242, 245, 242, 0.28); }

.stage {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5rem);
  padding: 4.5rem 1.5rem 3rem;
}

/* Atom: same construction as the hub */
.atom {
  --atom: min(34vw, 300px);
  width: var(--atom);
  aspect-ratio: 1;
  flex: 0 0 auto;
  position: relative;
}

.system { position: absolute; inset: 0; }

.orbit {
  position: absolute;
  width: 76%;
  height: 37%;
  left: 12%;
  top: 31.5%;
  border-radius: 50%;
  filter: drop-shadow(0 0 4px #05bfe5aa);
}

.orbit::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--orbit-color);
  -webkit-mask: radial-gradient(ellipse closest-side, transparent calc(100% - 4px), #000 100%);
  mask: radial-gradient(ellipse closest-side, transparent calc(100% - 4px), #000 100%);
}

.orbit.a { transform: rotate(10deg); --orbit-color: #0cd7f5; }
.orbit.b { transform: rotate(60deg); --orbit-color: #0aa1b8; }
.orbit.c { transform: rotate(-55deg); --orbit-color: #035263; }

.nucleus {
  position: absolute;
  width: 11%;
  aspect-ratio: 1;
  left: 44.5%;
  top: 44.5%;
  border-radius: 50%;
  background: #03c7f4;
  border: 1px solid #40e9ff;
  box-shadow: 0 0 0 1px #12dfff33, 0 0 30px 13px #00d9fc6e, 0 0 68px 35px #00dcff2b;
}

.nucleus::after {
  content: "";
  position: absolute;
  width: 37%;
  aspect-ratio: 1;
  left: 31.5%;
  top: 31.5%;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px #e2fcffaf, 0 0 12px white;
}

.electron-track {
  position: absolute;
  width: 76%;
  height: 37%;
  left: 12%;
  top: 31.5%;
  border-radius: 50%;
  transform: rotate(var(--angle));
}

.electron {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3.9%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: white;
  border: 3px solid #54eaff;
  box-shadow: 0 0 0 4px #2ddcff55, 0 0 12px 4px #00dfff;
  offset-path: ellipse(50% 50% at 50% 50%);
  offset-rotate: 0deg;
  animation: atom-travel var(--duration) linear infinite;
  animation-delay: var(--delay);
}

@keyframes atom-travel {
  from { offset-distance: 0%; }
  to { offset-distance: 100%; }
}

.copy {
  flex: 0 1 30rem;
  min-width: 0;
}

.kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lead {
  margin: 0 0 1.4rem;
  max-width: 36ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.field {
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}

.field .name {
  margin: 0 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hit {
  appearance: none;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 1rem;
  cursor: pointer;
}

.hit:hover { color: var(--neon); }

.hint {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.foot {
  margin: 0;
  padding-top: 0.95rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.status {
  position: fixed;
  left: 1.25rem;
  bottom: 1rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--neon);
}

@media (max-width: 800px) {
  .stage {
    flex-direction: column;
    gap: 1.5rem;
    padding: 4.5rem 1.25rem 3rem;
  }
  .atom { --atom: min(62vw, 220px); }
  .copy { width: min(32rem, 100%); }
  .hit { overflow-wrap: anywhere; }
}

@media (prefers-reduced-motion: reduce) {
  .electron { animation: none; offset-distance: 12%; }
}