:root {
  --desk: #121310;
  --desk-2: #1b1c17;
  --ink: #e9e4d6;
  --ink-dim: #9c978a;
  --beige: #d8ceb6;
  --beige-2: #bfb398;
  --beige-ink: #3b352a;
  --led-off: #4a1d18;
  --led-on: #ff3d2e;
  --phos: #5dff8a;
  --phos-dim: #2c9c4f;
  --phos-bg: #031007;
  --amber: #ffb000;
  --bad: #ff5a4e;
  --radius: 14px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 50% -10%, #2a2b22 0%, var(--desk) 60%) fixed, var(--desk);
  color: var(--ink);
  font: 15px/1.55 "IBM Plex Mono", ui-monospace, Menlo, monospace;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 16px 48px;
  display: grid;
  gap: 20px;
}

/* ——— masthead ——— */
.masthead { text-align: center; }
.logo {
  font: 400 clamp(56px, 12vw, 112px)/0.9 "VT323", monospace;
  letter-spacing: 0.04em;
  margin: 0;
  color: var(--phos);
  text-shadow: 0 0 18px rgba(93, 255, 138, 0.45), 0 0 2px #cfffdc;
}
.logo span { color: var(--amber); text-shadow: 0 0 18px rgba(255, 176, 0, 0.45); }
.logo::after {
  content: "_";
  animation: blink 1s steps(1) infinite;
  color: var(--phos);
}
.tag { margin: 10px 0 0; color: var(--ink-dim); }

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

/* ——— modem ——— */
.modem {
  background:
    repeating-linear-gradient(90deg, transparent 0 22px, rgba(0,0,0,.05) 22px 24px) top / 100% 18px no-repeat,
    linear-gradient(180deg, #e6dcc4 0%, var(--beige) 40%, var(--beige-2) 100%);
  color: var(--beige-ink);
  border-radius: 18px 18px 26px 26px;
  padding: 26px 22px 18px;
  box-shadow:
    inset 0 2px 0 rgba(255,255,255,.6),
    inset 0 -6px 0 rgba(0,0,0,.12),
    0 24px 40px -18px rgba(0,0,0,.8);
}
.modem-face {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  background: #26241f;
  border-radius: 10px;
  padding: 14px 18px;
  box-shadow: inset 0 3px 8px rgba(0,0,0,.6);
}
.badge b { display: block; color: #e8e0cc; letter-spacing: .18em; font-size: 13px; }
.badge small { color: #8d8674; font-size: 11px; }

.leds { display: flex; gap: 14px; flex-wrap: wrap; }
.led { display: grid; justify-items: center; gap: 4px; }
.led i {
  width: 12px; height: 12px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #7a3a33, var(--led-off));
  box-shadow: inset 0 -1px 2px rgba(0,0,0,.6);
  transition: background .05s, box-shadow .05s;
}
.led.on i {
  background: radial-gradient(circle at 35% 30%, #ffd2c8, var(--led-on) 55%);
  box-shadow: 0 0 10px 2px rgba(255, 61, 46, .75);
}
.led span { font-size: 10px; letter-spacing: .1em; color: #b8b09c; }

.modem-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.power {
  display: inline-flex; align-items: center; gap: 10px;
  font: 600 13px "IBM Plex Mono", monospace;
  letter-spacing: .12em;
  color: var(--beige-ink);
  background: none; border: 0; cursor: pointer; padding: 4px;
}
.rocker {
  width: 26px; height: 40px; border-radius: 5px;
  background: linear-gradient(180deg, #2b2923 0 50%, #151410 50%);
  box-shadow: inset 0 0 0 2px #0c0b09, 0 2px 0 rgba(255,255,255,.4);
  position: relative;
}
.rocker::after {
  content: ""; position: absolute; left: 4px; right: 4px; top: 5px; height: 14px;
  border-radius: 3px; background: #4a463c; transition: top .12s;
}
.power[aria-pressed="true"] .rocker::after { top: 21px; background: #c9392c; }
.power:focus-visible, .dial:focus-visible, .send:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

.mode-badge { flex: 1; font-size: 13px; letter-spacing: .06em; }
.mode-badge b { display: block; }
.mode-badge small { font-size: 11px; opacity: .7; letter-spacing: 0; }
.extras { display: flex; gap: 12px; align-items: center; }
.echo { font-size: 12px; font-weight: 600; display: flex; gap: 6px; align-items: center; cursor: pointer; }
.echo input { accent-color: #c9392c; }
.dial {
  font: 600 12px "IBM Plex Mono", monospace;
  padding: 7px 12px; border-radius: 6px; cursor: pointer;
  background: #26241f; color: #ffd98a; border: 0;
}
.dial:disabled { opacity: .45; cursor: not-allowed; }

/* ——— CRT ——— */
.crt {
  background: linear-gradient(145deg, #2c2b27, #161613);
  border-radius: 26px;
  padding: 18px;
  box-shadow: 0 30px 50px -20px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.08);
}
.screen {
  position: relative;
  background: radial-gradient(ellipse at center, #06200f 0%, var(--phos-bg) 75%);
  border-radius: 18px / 22px;
  overflow: hidden;
  padding: 14px;
  box-shadow: inset 0 0 60px rgba(0,0,0,.9), inset 0 0 6px rgba(93,255,138,.25);
}
.screen::after {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(0,0,0,.28) 0 1px, transparent 1px 3px),
    radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,.55) 100%);
  animation: flicker 6s infinite steps(60);
}
@keyframes flicker { 0%, 100% { opacity: .95; } 50% { opacity: 1; } 51% { opacity: .9; } }

.fall-wrap { position: relative; }
#fall {
  display: block; width: 100%; height: 130px;
  border-radius: 6px;
  background: #010702;
  image-rendering: pixelated;
}
.guides { position: absolute; inset: 0 0 18px; pointer-events: none; }
.guide {
  position: absolute; top: 0; bottom: 0; width: 0;
  border-left: 1px dashed rgba(255, 176, 0, .55);
}
.guide b {
  position: absolute; top: 2px; left: 3px;
  font: 400 15px/1 "VT323", monospace; color: var(--amber);
}
.axis {
  display: flex; justify-content: space-between;
  font: 400 15px/18px "VT323", monospace; color: var(--phos-dim);
}

.meters {
  display: flex; gap: 14px; flex-wrap: wrap;
  font: 400 17px/1 "VT323", monospace; color: var(--phos-dim);
  margin: 6px 0 8px;
}
.meter { display: flex; align-items: center; gap: 6px; }
.meter .bar { width: 60px; height: 7px; background: rgba(93,255,138,.12); border-radius: 2px; overflow: hidden; }
.meter .bar > i { display: block; height: 100%; width: 0; background: var(--phos); box-shadow: 0 0 6px var(--phos); }
.meter.lock { color: var(--phos); }

.term {
  height: 340px;
  overflow-y: auto;
  font: 400 21px/1.2 "VT323", monospace;
  color: var(--phos);
  text-shadow: 0 0 6px rgba(93,255,138,.55);
  white-space: pre-wrap;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: var(--phos-dim) transparent;
}
.ln.sys { color: var(--phos-dim); }
.ln.err { color: var(--bad); text-shadow: 0 0 6px rgba(255,90,78,.5); }
.ln.hi { color: #c9ffd8; }

.msg { margin: 8px 0; padding-left: 10px; border-left: 2px solid var(--phos-dim); }
.msg .meta { color: var(--phos-dim); font-size: 17px; }
.msg .nick { color: var(--amber); text-shadow: 0 0 6px rgba(255,176,0,.5); }
.msg .nick::after { content: "> "; }
.msg .pending { opacity: .3; }
.msg .caret { display: inline-block; width: .55em; height: .9em; background: var(--phos); vertical-align: -2px; animation: blink .8s steps(1) infinite; margin-left: 1px; }
.msg.done .caret { display: none; }
.msg.out { border-left-color: var(--amber); }
.msg.bad { border-left-color: var(--bad); }
.msg .verdict { font-size: 17px; margin-left: 8px; }
.msg.ok .verdict { color: var(--phos); }
.msg.bad .verdict { color: var(--bad); }
.msg.locked { border-left-color: var(--amber); }
.msg.locked .verdict { color: var(--amber); }
.msg.sealed .text { color: var(--amber); text-shadow: 0 0 6px rgba(255,176,0,.4); word-break: break-all; }
.msg.sealed.opened .text { color: var(--phos); text-shadow: 0 0 6px rgba(93,255,138,.55); word-break: break-word; }
.how code { font-size: 12.5px; color: var(--ink); }

/* ——— compose ——— */
.compose {
  display: grid; gap: 8px;
  background: var(--desk-2);
  border: 1px solid #2d2e26;
  border-radius: var(--radius);
  padding: 14px;
}
.compose-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.field { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--ink-dim); letter-spacing: .1em; }
.key-field { position: relative; }
#nick, #key, #msg {
  font: 400 15px "IBM Plex Mono", monospace;
  background: #0b0c09; color: var(--ink);
  border: 1px solid #34352c; border-radius: 8px;
  padding: 8px 10px;
}
#nick { width: 150px; }
#key { width: 210px; padding-right: 52px; }
.eye {
  position: absolute; right: 6px;
  font: 600 10px "IBM Plex Mono", monospace; letter-spacing: .06em;
  background: none; border: 0; color: var(--ink-dim); cursor: pointer; padding: 4px;
}
.eye:hover { color: var(--ink); }
.key-status { font-size: 12px; color: var(--ink-dim); }
.key-status.busy { color: var(--amber); }
.key-status.on { color: var(--phos); }
.key-status.on b { letter-spacing: .12em; }
.meta-row { font-size: 12px; color: var(--ink-dim); }
#msg { width: 100%; resize: vertical; min-height: 64px; }
#nick:focus, #key:focus, #msg:focus { outline: none; border-color: var(--phos-dim); box-shadow: 0 0 0 3px rgba(93,255,138,.12); }
#msg:disabled { opacity: .5; }
.eta, .count { font-size: 12px; color: var(--ink-dim); }
.send {
  font: 600 14px "IBM Plex Mono", monospace; letter-spacing: .08em;
  padding: 10px 18px; border-radius: 8px; border: 0; cursor: pointer;
  background: var(--phos); color: #032010;
  box-shadow: 0 0 18px rgba(93,255,138,.35);
}
.send:disabled { background: #2d3a30; color: #6c7d70; box-shadow: none; cursor: not-allowed; }

/* ——— how ——— */
.how { padding: 8px 4px; }
.how h2 { font: 400 34px/1 "VT323", monospace; color: var(--amber); margin: 0 0 12px; }
.how ol { margin: 0 0 16px; padding-left: 22px; display: grid; gap: 6px; }
.notes { display: grid; gap: 8px; color: var(--ink-dim); font-size: 13.5px; }
.notes p { margin: 0; }
.notes b { color: var(--ink); }
.share {
  display: inline-block; margin-top: 18px;
  padding: 10px 16px; border-radius: 8px;
  background: var(--ink); color: #111; text-decoration: none; font-weight: 600;
}
.share:hover { background: #fff; }
.links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.links .share { margin-top: 0; }
.share.ghost { background: none; color: var(--ink); border: 1px solid #45463c; }
.share.ghost:hover { background: #1f201a; }
footer { text-align: center; color: #5c5a50; font-size: 12px; }

@media (max-width: 600px) {
  .wrap { padding-top: 20px; }
  .modem { padding: 16px 14px 14px; }
  .leds { gap: 10px; }
  .crt { padding: 10px; border-radius: 18px; }
  .term { height: 300px; font-size: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  .screen::after, .logo::after, .msg .caret { animation: none; }
}