@font-face {
  font-family: "Meltdown Sans";
  src: url("./spike/assets/fonts/space-grotesk-400.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Meltdown Sans";
  src: url("./spike/assets/fonts/space-grotesk-500.ttf") format("truetype");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Tranz Neue";
  src: url("./assets/fonts/tranz-neue.otf") format("opentype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Alsatian";
  src: url("./assets/fonts/alsatian.woff") format("woff");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #111110;
  --ink: #f0efe9;
  --mute: #a7a59e;
  --rule: #575750;
  --signal: #ff6047;
  --mono: "Tranz Neue", "Courier New", monospace;
  --sans: "Meltdown Sans", "Helvetica Neue", Arial, sans-serif;
  --display: "Alsatian", Georgia, serif;
  --gutter: clamp(0.875rem, 2.5vw, 2.75rem);
}

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

html {
  min-width: 320px;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  scroll-padding-top: 5rem;
}

body {
  min-width: 320px;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font: 400 1rem/1.6 var(--sans);
  font-synthesis: none;
}

a {
  color: inherit;
  text-underline-offset: 0.3em;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: var(--gutter);
  z-index: 1000;
  padding: 1rem;
  background: var(--ink);
  color: var(--bg);
  font: 400 0.75rem/1.2 var(--mono);
  text-decoration: none;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

#wrap {
  width: 100%;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 3.5rem;
  padding: 0.25rem var(--gutter);
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}

.nav a,
.nav-meta {
  font: 400 0.7rem/1.4 var(--mono);
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.nav a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
}

.nav-brand img {
  display: block;
  width: 1.65rem;
  height: auto;
  filter: invert(1) brightness(3);
}

.nav-meta {
  margin-right: auto;
  color: var(--mute);
}

.nav-exit {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--signal);
}

#stage {
  display: grid;
  grid-template-columns: minmax(17rem, 1fr) minmax(0, 42rem);
  align-items: start;
  gap: clamp(2rem, 4vw, 4rem);
  max-width: 82rem;
  margin-inline: auto;
  padding: clamp(2rem, 4vw, 4rem) var(--gutter) 4rem;
}

.meltdown-title {
  position: sticky;
  top: 5rem;
  padding-block: 1rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.meltdown-title > p,
.transmission-meta {
  color: var(--mute);
  font: 400 0.7rem/1.6 var(--mono);
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.meltdown-title h1 {
  margin: 1.5rem 0;
  color: var(--signal);
  font: 500 clamp(3.25rem, 5.6vw, 6.5rem)/0.95 var(--display);
  letter-spacing: -0.035em;
}

.meltdown-title > p:last-child {
  color: var(--ink);
}

.transmission {
  min-width: 0;
  border-top: 1px solid var(--rule);
}

.transmission-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  min-height: 3rem;
  padding-block: 0.25rem;
  border-bottom: 1px solid var(--rule);
}

.transmission-complete {
  min-height: 2.75rem;
  padding: 0.5rem;
  border: 0;
  background: transparent;
  color: var(--signal);
  font: inherit;
  letter-spacing: inherit;
  text-transform: none;
  text-decoration: underline;
  text-underline-offset: 0.3em;
  cursor: pointer;
}

.transmission-complete:hover,
.transmission-complete:focus-visible {
  background: var(--signal);
  color: var(--bg);
}

.transmission-readable {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: normal;
}

#out {
  min-height: 60vh;
  padding-block: 1.5rem;
  color: var(--ink);
  font: 400 clamp(1.0625rem, 1.35vw, 1.125rem)/1.65 var(--sans);
  letter-spacing: -0.01em;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

#out .open {
  display: block;
  margin-bottom: 1.25rem;
  font: 500 clamp(2.15rem, 3vw, 3rem)/1.08 var(--display);
  letter-spacing: -0.035em;
}

#out .end {
  display: block;
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--mute);
  font: 400 0.7rem/1.6 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.caret {
  display: inline-block;
  width: 0.5ch;
  height: 0.9em;
  margin-left: 0.15em;
  vertical-align: baseline;
  background: var(--signal);
  animation: transmission-blink 1.1s steps(1) infinite;
}

body.is-idle .caret {
  opacity: 0.3;
  animation: none;
}

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

#hint {
  position: fixed;
  right: var(--gutter);
  bottom: 1rem;
  z-index: 2;
  max-width: calc(100vw - var(--gutter) * 2);
  padding: 0.5rem 0;
  background: var(--bg);
  color: var(--mute);
  font: 400 0.7rem/1.5 var(--mono);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms linear;
}

#hint.show {
  opacity: 1;
}

@media (max-width: 820px) {
  .nav {
    min-height: 3.5rem;
    gap: 1rem;
  }

  .nav-meta {
    display: none;
  }

  #stage {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
    max-width: 45rem;
    padding-top: 1.5rem;
  }

  .meltdown-title {
    position: static;
  }

  .meltdown-title h1 {
    margin-block: 1.25rem;
    font-size: clamp(3.5rem, 12vw, 5.6rem);
  }

  #out {
    padding-top: 1.5rem;
    font-size: 1.0625rem;
    line-height: 1.65;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}