:root {
  /* Typography compliance terms: IBM Plex Sans Condensed** for oversized routing stamps; Space Mono** only as a restrained accent for serial numbers. */
  --bone: #E9E1C7;
  --terminal: #10251F;
  --amber: #FFB23E;
  --cyan: #38D9D0;
  --red: #FF3B30;
  --purple: #5F4B8B;
  --carbon: #7D8B86;
  --grid: 8px;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  background: var(--terminal);
  color: var(--terminal);
  font-family: "Atkinson Hyperlegible", Atkinson, Verdana, system-ui, sans-serif;
}

body {
  cursor: crosshair;
}

.routing-machine {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--bone);
  isolation: isolate;
}

.routing-machine::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(16, 37, 31, .06) 1px, transparent 1px),
    linear-gradient(0deg, rgba(16, 37, 31, .04) 1px, transparent 1px),
    radial-gradient(circle at 82% 18%, rgba(255, 178, 62, .18), transparent 28%),
    radial-gradient(circle at 20% 78%, rgba(56, 217, 208, .10), transparent 35%);
  background-size: 32px 32px, 32px 32px, auto, auto;
  opacity: .75;
  pointer-events: none;
  z-index: 0;
}

.paper-grain {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(var(--terminal) .7px, transparent .7px),
    linear-gradient(90deg, transparent 0 47%, rgba(125, 139, 134, .12) 48% 49%, transparent 50%);
  background-size: 11px 11px, 117px 100%;
  mix-blend-mode: multiply;
  opacity: .28;
  pointer-events: none;
  z-index: 2;
}

.state {
  position: absolute;
  inset: 0;
  padding: clamp(18px, 4vw, 64px);
  opacity: 0;
  transform: translateY(18px) scale(.99);
  pointer-events: none;
  transition: opacity .42s ease, transform .55s cubic-bezier(.18, 1.25, .33, 1);
  z-index: 3;
}

.state.is-active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.state.feed-jitter {
  animation: feed-jitter .28s steps(3, end);
}

.state h2 {
  position: absolute;
  margin: 0;
  font-family: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  font-size: clamp(6rem, 23vw, 22rem);
  line-height: .72;
  letter-spacing: -.08em;
  color: transparent;
  -webkit-text-stroke: 2px rgba(16, 37, 31, .45);
  transform: rotate(-7deg);
  opacity: .55;
}

.fragment {
  position: absolute;
  border: 2px solid var(--terminal);
  background: rgba(233, 225, 199, .84);
  padding: 10px 12px;
  z-index: 8;
  box-shadow: 6px 5px 0 rgba(255, 59, 48, .52);
}

.sender-window {
  top: 23px;
  left: 18px;
  width: 220px;
  transform: translateX(3px) rotate(-1deg);
}

.sender-window strong,
.sender-window em {
  display: block;
  font-size: 13px;
  font-style: normal;
  margin-top: 5px;
}

.recipient-void {
  right: 7vw;
  bottom: 7vh;
  width: 238px;
  transform: rotate(2deg);
}

.recipient-void i {
  display: block;
  height: 13px;
  margin: 8px 0;
  background: var(--terminal);
}

.recipient-void i:nth-child(3) { width: 72%; }
.recipient-void i:nth-child(4) { width: 52%; background: var(--red); }

.micro,
.code {
  font-family: "Space Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.verification-strip {
  position: absolute;
  top: 4vh;
  right: -12px;
  width: 44px;
  min-height: 65vh;
  border-left: 2px dashed var(--carbon);
  border-right: 2px dashed var(--carbon);
  background: rgba(255, 178, 62, .23);
  z-index: 9;
}

.verification-strip span {
  display: block;
  margin: 28px 0;
  font-family: "Space Mono", monospace;
  font-size: 10px;
  writing-mode: vertical-rl;
  color: var(--terminal);
}

.conveyor {
  position: absolute;
  inset: -10vh -10vw;
  z-index: 1;
  pointer-events: none;
  transform: rotate(-13deg) translateY(var(--tug-y, 0px));
  transition: transform .2s ease-out;
}

.conveyor-line {
  position: absolute;
  left: -6vw;
  top: 53vh;
  width: 130vw;
  height: 10px;
  border-top: 2px solid var(--purple);
  border-bottom: 2px solid var(--purple);
  background: repeating-linear-gradient(90deg, rgba(95, 75, 139, .30) 0 18px, transparent 18px 30px);
}

.packet {
  position: absolute;
  top: 48vh;
  padding: 5px 10px;
  border: 2px solid var(--purple);
  background: var(--bone);
  font-family: "Space Mono", monospace;
  font-size: 11px;
  animation: packet-drift 12s linear infinite;
}

.packet-one { left: 4vw; animation-delay: -1s; }
.packet-two { left: 48vw; animation-delay: -5s; }
.packet-three { left: 86vw; animation-delay: -9s; }

.queue-column {
  position: absolute;
  right: 76px;
  top: 18vh;
  width: 112px;
  border-left: 2px solid var(--terminal);
  padding-left: 11px;
  font-family: "Space Mono", monospace;
  font-size: 11px;
  line-height: 2.2;
}

.queue-column b,
.queue-column span { display: block; }

.stamp-stack {
  position: absolute;
  left: 8vw;
  top: 29vh;
  width: 84vw;
  height: 33vh;
  transform: rotate(-8deg);
  pointer-events: none;
}

.stamp {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  font-weight: 700;
  font-size: clamp(5rem, 17vw, 16rem);
  letter-spacing: -.06em;
  line-height: .7;
  text-transform: uppercase;
  border: clamp(7px, 1.2vw, 15px) solid currentColor;
  border-radius: 2px;
  opacity: 0;
  transform: translateY(-65vh) scaleY(1.08);
  animation: stamp-hit .9s cubic-bezier(.28, 1.7, .5, .98) forwards;
}

.stamp-shadow {
  color: var(--red);
  transform: translate(12px, -65vh) scaleY(1.08);
  animation-delay: .06s;
  opacity: .6;
}

.stamp-main {
  color: var(--amber);
  text-shadow: -3px 4px 0 var(--terminal);
  animation-delay: .14s;
}

.stamp-cut {
  inset: auto 14% -24px auto;
  width: 38%;
  height: 54px;
  color: var(--terminal);
  background: rgba(56, 217, 208, .18);
  font-size: clamp(1.4rem, 3.4vw, 4rem);
  letter-spacing: .02em;
  border-width: 4px;
  animation-delay: .28s;
}

.accepted-note {
  position: absolute;
  left: 52vw;
  top: 16vh;
  padding: 4px 9px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: var(--terminal);
  font-family: "Space Mono", monospace;
  font-size: 12px;
  text-transform: uppercase;
  animation: blink-note 1.05s steps(2, jump-none) infinite;
}

.edge-envelope,
.flying-envelope {
  position: absolute;
  width: 178px;
  height: 112px;
  background: var(--bone);
  border: 4px solid var(--terminal);
  box-shadow: 8px 7px 0 var(--cyan), -5px -3px 0 rgba(255, 59, 48, .7);
}

.edge-envelope {
  left: -88px;
  top: 57vh;
  transform: rotate(5deg);
  opacity: .88;
}

.env-flap {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(30deg, transparent 48%, var(--terminal) 49% 51%, transparent 52%),
    linear-gradient(150deg, transparent 48%, var(--terminal) 49% 51%, transparent 52%);
}

.env-window {
  position: absolute;
  right: 12px;
  bottom: 15px;
  min-width: 72px;
  padding: 5px 7px;
  background: var(--terminal);
  color: var(--bone);
  font-family: "Space Mono", monospace;
  font-size: 10px;
}

.env-route {
  position: absolute;
  left: 18px;
  top: 12px;
  color: var(--red);
  font-size: 46px;
  font-family: "IBM Plex Sans Condensed", sans-serif;
}

.address-slip {
  position: absolute;
  background: rgba(233, 225, 199, .96);
  border: 2px solid var(--terminal);
  box-shadow: 10px 10px 0 rgba(125, 139, 134, .45);
  padding: 18px;
  width: min(370px, 78vw);
  transform: rotate(-2deg);
}

.address-slip p { margin: 10px 0; }

.slip-label {
  display: inline-block;
  padding: 3px 8px;
  background: var(--amber);
  border: 1px solid var(--terminal);
  font-family: "IBM Plex Sans Condensed", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
}

.raw-slip { left: 20vw; bottom: 9vh; }

.state-mask { background: var(--terminal); color: var(--bone); }
.state-mask h2 { right: -3vw; top: 11vh; -webkit-text-stroke-color: rgba(233, 225, 199, .36); }

.mask-slip {
  left: 9vw;
  top: 22vh;
  color: var(--terminal);
  transform: rotate(1.3deg);
}

.mask-slip mark {
  display: inline-block;
  color: transparent;
  background: var(--terminal);
  padding: 0 6px;
}

.redactions i {
  display: block;
  height: 16px;
  margin: 11px 0;
  background: var(--terminal);
  transform-origin: left center;
}
.redactions i:nth-child(1) { width: 78%; }
.redactions i:nth-child(2) { width: 58%; background: var(--red); }
.redactions i:nth-child(3) { width: 91%; }

.route-svg {
  position: absolute;
  inset: 12vh 2vw auto auto;
  width: 78vw;
  height: 62vh;
  overflow: visible;
}

.route-svg path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 5;
  stroke-dasharray: 18 12;
  stroke-linecap: square;
  filter: drop-shadow(8px 6px 0 rgba(255, 59, 48, .34));
  animation: draw-route 2s linear infinite;
}

.route-svg circle { fill: var(--amber); stroke: var(--bone); stroke-width: 4; }

.terse {
  position: absolute;
  margin: 0;
  font-size: clamp(1.3rem, 3.5vw, 4.8rem);
  font-family: "Atkinson Hyperlegible", sans-serif;
  font-weight: 700;
  letter-spacing: -.04em;
}

.mask-copy { right: 9vw; bottom: 16vh; color: var(--cyan); }

.state-forward { background: var(--bone); }
.state-forward h2 { left: -5vw; bottom: 15vh; }

.portal {
  position: absolute;
  top: 24vh;
  width: 22vw;
  height: 44vh;
  min-width: 180px;
  border: 5px solid var(--purple);
  background: var(--terminal);
  overflow: hidden;
}

.portal span {
  position: absolute;
  inset: 13px;
  border: 2px dashed var(--cyan);
  background: repeating-linear-gradient(0deg, rgba(56, 217, 208, .22) 0 3px, transparent 3px 13px);
}

.portal-left { left: -7vw; transform: rotate(-3deg); }
.portal-right { right: -5vw; top: 35vh; transform: rotate(4deg); }

.flying-envelope {
  top: 36vh;
  left: 7vw;
  transform: rotate(-6deg);
  animation: envelope-cross 5s cubic-bezier(.4, 0, .2, 1) infinite;
}

.tube-map {
  position: absolute;
  left: 24vw;
  right: 20vw;
  top: 29vh;
  bottom: 29vh;
  border: 2px solid var(--terminal);
  border-left: 0;
  border-right: 0;
  transform: rotate(-9deg);
}

.tube-map i {
  position: absolute;
  width: 44px;
  height: 44px;
  border: 3px solid var(--terminal);
  border-radius: 50%;
  background: var(--amber);
}
.tube-map i:nth-child(1) { left: 4%; top: -24px; }
.tube-map i:nth-child(2) { left: 32%; bottom: -24px; background: var(--cyan); }
.tube-map i:nth-child(3) { left: 64%; top: -24px; background: var(--red); }
.tube-map i:nth-child(4) { right: 5%; bottom: -24px; background: var(--purple); }

.forward-copy { left: 31vw; bottom: 11vh; color: var(--purple); transform: rotate(.8deg); }

.state-return { background: var(--terminal); color: var(--bone); }
.state-return h2 { left: 15vw; top: 8vh; -webkit-text-stroke-color: rgba(255, 178, 62, .5); }

.return-slip {
  right: 14vw;
  top: 25vh;
  color: var(--terminal);
  transform: rotate(3deg);
}

.contradictory-stamps b {
  display: inline-block;
  margin: 6px 6px 0 0;
  padding: 5px 9px;
  border: 3px solid var(--red);
  color: var(--red);
  font-family: "IBM Plex Sans Condensed", sans-serif;
  transform: rotate(-4deg);
}
.contradictory-stamps b:nth-child(2) { border-color: var(--cyan); color: var(--cyan); transform: rotate(2deg); }
.contradictory-stamps b:nth-child(3) { border-color: var(--purple); color: var(--purple); }

.mitten-hand {
  position: absolute;
  left: 8vw;
  bottom: 18vh;
  width: 210px;
  height: 95px;
  background: var(--amber);
  border: 4px solid var(--bone);
  border-radius: 58px 36px 42px 58px;
  transform: rotate(-7deg);
  box-shadow: 12px 10px 0 var(--red);
}
.mitten-hand span {
  position: absolute;
  right: -42px;
  top: 14px;
  width: 72px;
  height: 40px;
  background: var(--amber);
  border: 4px solid var(--bone);
  border-left: 0;
  border-radius: 0 30px 30px 0;
}

.return-copy { left: 12vw; top: 20vh; color: var(--amber); }

.state-vanish {
  background: var(--bone);
  color: var(--terminal);
}

.proxy-seal {
  position: absolute;
  left: 50%;
  top: 49%;
  width: min(320px, 70vw);
  height: min(320px, 70vw);
  transform: translate(-50%, -50%) rotate(-4deg);
  border: 7px double var(--terminal);
  border-radius: 50%;
  display: grid;
  place-content: center;
  text-align: center;
  background: rgba(233, 225, 199, .8);
  box-shadow: 12px 9px 0 var(--cyan), -8px -6px 0 rgba(255, 59, 48, .65);
}

.proxy-seal span,
.proxy-seal strong {
  font-family: "IBM Plex Sans Condensed", sans-serif;
  font-size: clamp(3.4rem, 10vw, 6.6rem);
  line-height: .72;
  letter-spacing: -.08em;
}

.proxy-seal em {
  margin-top: 22px;
  font-family: "Space Mono", monospace;
  font-style: normal;
  font-size: 11px;
  color: var(--carbon);
}

.cyan-dot {
  position: absolute;
  left: 50%;
  top: 72%;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 28px var(--cyan), 24px 0 0 rgba(56, 217, 208, .12), 48px 0 0 rgba(56, 217, 208, .06);
  animation: dot-vanish 2.8s cubic-bezier(.2, 1.4, .35, 1) infinite;
}

.crop-mark {
  position: absolute;
  width: 64px;
  height: 64px;
  border-color: var(--terminal);
  opacity: .6;
}
.cm-a { left: 34px; top: 30px; border-left: 3px solid; border-top: 3px solid; }
.cm-b { right: 34px; top: 30px; border-right: 3px solid; border-top: 3px solid; }
.cm-c { left: 34px; bottom: 30px; border-left: 3px solid; border-bottom: 3px solid; }
.cm-d { right: 34px; bottom: 30px; border-right: 3px solid; border-bottom: 3px solid; }

.vanish-code {
  position: absolute;
  bottom: 9vh;
  left: 50%;
  transform: translateX(-50%);
  color: var(--carbon);
  white-space: nowrap;
}

.state-nav {
  position: fixed;
  left: 18px;
  bottom: 16px;
  z-index: 20;
  display: flex;
  gap: 6px;
  transform: rotate(-1deg);
}

.state-nav button {
  border: 2px solid var(--terminal);
  background: var(--bone);
  color: var(--terminal);
  padding: 7px 9px;
  font-family: "Space Mono", monospace;
  font-size: 10px;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--carbon);
}

.state-nav button.is-current {
  background: var(--terminal);
  color: var(--cyan);
  box-shadow: 3px 3px 0 var(--red);
}

@keyframes stamp-hit {
  0% { opacity: 0; transform: translateY(-65vh) scaleY(1.08); }
  54% { opacity: .96; transform: translateY(14px) scaleY(.82); }
  68% { transform: translateY(-16px) scaleY(1.06); }
  82% { transform: translateY(7px) scaleY(.95); }
  100% { opacity: .92; transform: translateY(0) scaleY(1); }
}

@keyframes blink-note {
  0%, 42% { opacity: 1; }
  43%, 80% { opacity: .18; }
  81%, 100% { opacity: 1; }
}

@keyframes packet-drift {
  from { transform: translateX(-18vw); }
  to { transform: translateX(38vw); }
}

@keyframes draw-route {
  from { stroke-dashoffset: 160; }
  to { stroke-dashoffset: 0; }
}

@keyframes envelope-cross {
  0% { transform: translateX(0) translateY(0) rotate(-6deg); opacity: 0; }
  12% { opacity: 1; }
  48% { transform: translateX(42vw) translateY(-18vh) rotate(3deg); }
  74% { transform: translateX(78vw) translateY(11vh) rotate(-9deg); opacity: 1; }
  100% { transform: translateX(96vw) translateY(9vh) rotate(-9deg); opacity: 0; }
}

@keyframes dot-vanish {
  0% { transform: translate(-50%, 0) scale(1); opacity: 1; }
  32% { transform: translate(-50%, -22px) scale(1.22); opacity: 1; }
  49% { transform: translate(-50%, 3px) scale(.78); opacity: .8; }
  75% { transform: translate(-50%, -8px) scale(.25); opacity: .35; }
  100% { transform: translate(-50%, -8px) scale(0); opacity: 0; }
}

@keyframes feed-jitter {
  0% { transform: translateY(0) translateX(0) scale(1); }
  35% { transform: translateY(-4px) translateX(6px) scale(1); }
  70% { transform: translateY(3px) translateX(-5px) scale(1); }
  100% { transform: translateY(0) translateX(0) scale(1); }
}

@media (max-width: 760px) {
  .sender-window { width: 176px; }
  .queue-column { right: 16px; top: 21vh; font-size: 9px; }
  .stamp-stack { left: -4vw; width: 104vw; top: 31vh; }
  .state-nav { right: 10px; left: 10px; flex-wrap: wrap; }
  .state-nav button { flex: 1; padding: 7px 3px; }
  .verification-strip { display: none; }
  .mask-slip, .return-slip { left: 8vw; right: auto; top: 38vh; }
  .terse { left: 8vw; right: 8vw; bottom: 14vh; }
}