:root {
  color-scheme: light;
  --porcelain: #e8eef3;
  --paper: #f7fafc;
  --ink: #102337;
  --cobalt: #2858e8;
  --signal: #f05a3f;
  --mist: #a9b8c5;
  --line: rgba(16, 35, 55, 0.2);
  --display: "Arial Narrow", "Avenir Next Condensed", "Helvetica Neue", sans-serif;
  --body: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
  --utility: "SFMono-Regular", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  min-height: 100%;
  overflow-x: clip;
  background: var(--porcelain);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent calc(50% - 0.5px), var(--line) 50%, transparent calc(50% + 0.5px)),
    linear-gradient(var(--line) 1px, transparent 1px),
    var(--porcelain);
  background-size: 100% 100%, 100% 25%, auto;
  font-family: var(--body);
}

.shell {
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto 1fr auto;
  padding: clamp(1.25rem, 3vw, 2.75rem);
}

.masthead,
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  font-family: var(--utility);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  line-height: 1.4;
  text-transform: uppercase;
}

.masthead {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--ink);
}

.masthead p,
.footer p {
  margin: 0;
}

.wordmark {
  font-weight: 700;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-align: right;
}

.status__mark {
  width: 0.55rem;
  height: 0.55rem;
  border: 1px solid var(--signal);
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 0.25rem rgba(240, 90, 63, 0.14);
}

.field {
  position: relative;
  display: grid;
  grid-template-columns: minmax(4rem, 0.42fr) minmax(15rem, 1fr);
  align-items: center;
  width: min(100%, 87rem);
  margin: 0 auto;
  padding: clamp(3rem, 9vw, 8rem) 0;
}

.field__index {
  align-self: stretch;
  display: grid;
  place-items: center;
  border-right: 1px solid var(--ink);
  color: var(--cobalt);
  font-family: var(--display);
  font-size: clamp(1.3rem, 2vw, 2.1rem);
  font-stretch: condensed;
  font-weight: 800;
  letter-spacing: -0.06em;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.field__content {
  position: relative;
  z-index: 1;
  padding-left: clamp(1.75rem, 6vw, 7.5rem);
}

.eyebrow,
.notice {
  font-family: var(--utility);
  font-size: clamp(0.68rem, 1vw, 0.78rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 clamp(1.5rem, 4vw, 3.5rem);
  color: var(--cobalt);
}

h1 {
  max-width: 10ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(4.7rem, 13vw, 12rem);
  font-stretch: condensed;
  font-weight: 800;
  letter-spacing: -0.075em;
  line-height: 0.72;
  text-transform: uppercase;
}

.notice {
  margin: clamp(2.25rem, 5vw, 4.5rem) 0 0;
}

.trace {
  position: absolute;
  right: 0;
  bottom: 15%;
  left: 34%;
  height: 2.5rem;
  overflow: hidden;
  pointer-events: none;
}

.trace__line {
  position: absolute;
  top: 50%;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--mist);
}

.trace__line::before {
  position: absolute;
  top: -0.8rem;
  left: 55%;
  width: 1.6rem;
  height: 1.6rem;
  border: solid var(--signal);
  border-width: 1px 1px 0 0;
  content: "";
  transform: rotate(-45deg) skew(-14deg, -14deg);
  transform-origin: center;
}

.trace__pulse {
  position: absolute;
  top: calc(50% - 0.2rem);
  left: 0;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--cobalt);
  animation: scan 7s cubic-bezier(0.72, 0, 0.28, 1) infinite;
}

.footer {
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
  color: rgba(16, 35, 55, 0.68);
}

.error {
  align-self: center;
  max-width: 62rem;
  padding: clamp(4rem, 10vw, 9rem) 0;
}

.error h1 {
  max-width: 12ch;
  font-size: clamp(3.6rem, 9vw, 8.5rem);
  line-height: 0.82;
}

.return-link {
  display: inline-block;
  margin-top: clamp(2.5rem, 6vw, 5rem);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid currentColor;
  color: var(--cobalt);
  font-family: var(--utility);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.return-link:hover {
  color: var(--signal);
}

.return-link:focus-visible {
  outline: 2px solid var(--cobalt);
  outline-offset: 0.4rem;
}

@keyframes scan {
  0%, 18% {
    left: 0;
    opacity: 0;
  }
  24% {
    opacity: 1;
  }
  78% {
    opacity: 1;
  }
  84%, 100% {
    left: calc(100% - 0.4rem);
    opacity: 0;
  }
}

@media (max-width: 42rem) {
  .masthead,
  .footer {
    align-items: flex-start;
  }

  .field {
    grid-template-columns: 2.75rem minmax(0, 1fr);
  }

  .field__content {
    padding-left: 1.35rem;
  }

  h1 {
    font-size: clamp(4rem, 22vw, 7.5rem);
    line-height: 0.76;
  }

  .trace {
    left: 3.75rem;
  }
}

@media (max-width: 27rem) {
  .masthead,
  .footer {
    gap: 1rem;
    font-size: 0.6rem;
  }

  .status {
    max-width: 11rem;
  }

  .field {
    padding: 3.75rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .trace__pulse {
    left: calc(55% + 0.65rem);
    animation: none;
  }
}