:root {
  --phosphor: #ffb000;
  --phosphor-dim: #8a5f00;
  --bg: #0a0602;
}

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

html { background: #000; }

body {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  color: var(--phosphor);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2rem 1rem;
}

.bezel {
  background: #111;
  border-radius: 18px;
  padding: 14px;
  max-width: 900px;
  width: 100%;
  box-shadow: 0 0 60px rgba(255, 176, 0, 0.08);
}

.crt {
  position: relative;
  background: radial-gradient(ellipse at center, #120b03 0%, var(--bg) 75%);
  border-radius: 10px;
  padding: 2rem 1.5rem 3rem;
  overflow: hidden;
  text-shadow: 0 0 6px rgba(255, 176, 0, 0.55);
  animation: crt-flicker 8s infinite;
}

/* Scanlines: static overlay, always on. */
.crt::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.28) 3px,
    rgba(0, 0, 0, 0.28) 4px
  );
}

/* Vignette + faint curvature shading. */
.crt::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center,
    rgba(0, 0, 0, 0) 55%, rgba(0, 0, 0, 0.55) 100%);
}

pre {
  font-family: inherit;
  font-size: clamp(0.7rem, 2.2vw, 1rem);
  line-height: 1.45;
  white-space: pre;
  overflow-x: auto;
}

.lang {
  position: absolute;
  top: 0.9rem;
  right: 1.2rem;
  z-index: 1;
}

.lang button {
  background: none;
  border: none;
  color: var(--phosphor-dim);
  font: inherit;
  cursor: pointer;
  padding: 0.1rem 0.25rem;
  text-shadow: inherit;
}

.lang button[aria-pressed="true"] { color: var(--phosphor); text-decoration: underline; }
.lang span { color: var(--phosphor-dim); }

#boot { min-height: 16rem; }

.cursor { animation: blink 1.05s steps(1) infinite; }

.explain { max-width: 62ch; margin: 2.5rem auto 0; }
.explain h1 { font-size: 1.15rem; margin-bottom: 0.9rem; text-transform: uppercase; letter-spacing: 0.12em; }
.explain p { margin-bottom: 0.9rem; line-height: 1.55; }
.connect-label { color: var(--phosphor-dim); }

.connect {
  border: 1px solid var(--phosphor-dim);
  padding: 0.7rem 1rem;
  margin-top: 0.4rem;
  user-select: all;
}

.boards { margin-top: 2.5rem; }

footer { margin-top: 2.5rem; color: var(--phosphor-dim); }
footer pre { text-shadow: none; }

@keyframes blink { 50% { opacity: 0; } }

@keyframes crt-flicker {
  0%, 96%, 100% { opacity: 1; }
  97% { opacity: 0.92; }
  98% { opacity: 1; }
  99% { opacity: 0.96; }
}

@media (prefers-reduced-motion: reduce) {
  .crt { animation: none; }
  .cursor { animation: none; }
}