:root{
  --green:#33ff33;
  --green-dim:rgba(51,255,51,.42);
  --green-ghost:rgba(51,255,51,.22);
  --amber:#ffb000;
  --bg:#000;
  --pad:clamp(18px,4.5vw,64px);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);}
html{height:100%;}
body{
  min-height:100svh;
  color:var(--green);
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:clamp(16px,1.05vw + 12px,20px);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-shadow:0 0 8px currentColor;
  overflow:hidden;
  overscroll-behavior:none;
  -webkit-tap-highlight-color:transparent;
}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---- CRT atmosphere ---- */
.crt{
  position:fixed;inset:0;z-index:3;pointer-events:none;
  background:repeating-linear-gradient(
    to bottom,
    rgba(51,255,51,.055) 0px,
    rgba(51,255,51,.055) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode:screen;
  animation:flicker 6.5s steps(1,end) infinite;
}
.vignette{
  position:fixed;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(ellipse at center,transparent 52%,rgba(0,0,0,.85) 100%);
}
@keyframes flicker{
  0%,96%,100%{opacity:1}
  97%{opacity:.72}
  98%{opacity:1}
  99%{opacity:.84}
}

/* ---- layout ---- */
.screen{
  position:relative;z-index:1;
  display:flex;flex-direction:column;justify-content:center;
  height:100svh;
  max-height:100svh;
  padding:var(--pad) var(--pad) calc(var(--pad) * .6 + 2.6em);
  max-width:78ch;
  margin:0 auto;
}
.log{
  flex:0 1 auto;
  min-height:0;
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
  padding-bottom:1.2em;
  display:flex;
  flex-direction:column;
}
.log::-webkit-scrollbar{display:none}

.line{white-space:pre-wrap;word-break:break-word;margin:0 0 .15em}
.line.gap{margin-top:1.05em}
.line.echoed{color:var(--green-dim);text-shadow:0 0 6px rgba(51,255,51,.35)}
.line.faded{color:var(--green-ghost);text-shadow:none}
.line.alert{color:var(--amber);text-shadow:0 0 9px rgba(255,176,0,.85)}
.line.head{letter-spacing:.14em;text-transform:uppercase;font-weight:700}
.line.rule{color:var(--green-ghost);text-shadow:none;letter-spacing:.05em}
.line.blank{height:1.35em}
.line.small{font-size:.88em;color:var(--green-dim);text-shadow:0 0 6px rgba(51,255,51,.3)}

a{color:inherit;text-decoration:none;border-bottom:1px solid var(--green-dim)}
a:hover,a:focus-visible{background:var(--green);color:#000;text-shadow:none;outline:none;border-color:var(--green)}
.line.alert a{border-bottom-color:rgba(255,176,0,.5)}
.line.alert a:hover,.line.alert a:focus-visible{background:var(--amber);color:#000}

/* ---- prompt ---- */
.prompt{
  flex:0 0 auto;
  display:flex;align-items:baseline;gap:.6ch;
  padding-top:.9em;
  padding-bottom:env(safe-area-inset-bottom,0);
}
.prompt[hidden]{display:none}
.caret{color:var(--green)}
.field{position:relative;display:inline-flex;align-items:baseline;flex:1 1 auto;min-width:0}
.echo{white-space:pre;overflow:hidden;text-overflow:clip}
.cursor{
  display:inline-block;width:.62ch;height:1.05em;
  transform:translateY(.16em);
  background:var(--green);box-shadow:0 0 10px var(--green);
  animation:blink 1.05s step-end infinite;
}
.cursor.idle{opacity:.35;animation:none}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}

#cmd{
  position:absolute;inset:0;width:100%;
  font:inherit;font-size:max(16px,1em);
  background:transparent;border:0;outline:none;
  color:transparent;caret-color:transparent;
  padding:0;
}
#cmd::selection{background:rgba(51,255,51,.3)}

/* typing cursor appended to streaming text */
.tick{
  display:inline-block;width:.62ch;height:1.02em;
  vertical-align:baseline;
  transform:translateY(.16em);
  background:var(--green);box-shadow:0 0 10px var(--green);
}

.hint{
  position:absolute;left:var(--pad);right:var(--pad);
  bottom:calc(var(--pad) * .6 + env(safe-area-inset-bottom,0px));
  margin:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  font-size:.74em;letter-spacing:.06em;
  color:rgba(51,255,51,.28);text-shadow:none;
  transition:opacity .5s ease;
}
.hint.hide{opacity:0}

.tick.rest{animation:blink 1.05s step-end infinite;margin-left:.4ch}

@media (max-width:520px){
  body{line-height:1.6}
  .screen{max-width:none;padding-bottom:calc(var(--pad) * .55 + 2.6em)}
  .hint{font-size:.66em;letter-spacing:.04em}
}

@media (prefers-reduced-motion:reduce){
  .crt{animation:none;opacity:.5}
  .cursor{animation:none}
  *{transition:none !important}
}