:root {
  --black: #000000;
  --green: #00ff66;
  --green-soft: #6dff9f;
  --green-dim: rgba(0, 255, 102, 0.66);
  --green-ghost: rgba(0, 255, 102, 0.14);
  --font-terminal: "IBM Plex Mono", "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: var(--black);
  color: var(--green);
  font-family: var(--font-terminal);
  overflow: hidden;
}

button,
input {
  font: inherit;
}

.site-shell {
  position: relative;
  width: 100vw;
  height: 100dvh;
  min-height: 100vh;
  background: var(--black);
  isolation: isolate;
}

#pixel-field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: var(--black);
  image-rendering: pixelated;
}

.intro {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: grid;
  place-content: center;
  gap: clamp(1rem, 4vw, 1.75rem);
  padding: 1.5rem;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 800ms ease;
}

.intro.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.intro.is-leaving {
  opacity: 0;
  pointer-events: none;
}

.intro__mark {
  color: var(--black);
  font-size: clamp(4rem, 18vw, 13rem);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: 0;
  text-shadow:
    0 0 1px rgba(0, 0, 0, 0.95),
    0 0 18px rgba(0, 0, 0, 0.54);
  user-select: none;
}

.intro__button {
  justify-self: center;
  min-width: 8.5rem;
  min-height: 3rem;
  padding: 0.65rem 1.35rem;
  border: 1px solid var(--black);
  border-radius: 0;
  background: transparent;
  color: var(--black);
  cursor: pointer;
  letter-spacing: 0;
  text-transform: uppercase;
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.3),
    0 0 22px rgba(0, 0, 0, 0.24);
  transition:
    background-color 140ms ease,
    color 140ms ease,
    transform 140ms ease;
}

.intro__button:hover,
.intro__button:focus-visible {
  background: var(--black);
  color: var(--green);
  outline: none;
}

.intro__button:active {
  transform: translateY(1px);
}

.terminal {
  position: fixed;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0.35rem;
  padding: clamp(0.85rem, 2vw, 1.4rem);
  background:
    linear-gradient(rgba(0, 255, 102, 0.04) 50%, rgba(0, 0, 0, 0.04) 50%),
    var(--black);
  background-size: 100% 4px;
  color: var(--green);
  text-shadow: 0 0 8px var(--green-dim);
}

.terminal::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at center, transparent 0 48%, rgba(0, 0, 0, 0.35) 100%),
    linear-gradient(90deg, transparent, var(--green-ghost), transparent);
  mix-blend-mode: screen;
  opacity: 0.28;
}

.terminal[hidden] {
  display: none;
}

.terminal__screen {
  width: min(100%, 90rem);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  line-height: 1.48;
}

.terminal__input-row {
  position: relative;
  z-index: 1;
  display: none;
  align-items: center;
  gap: 0.6rem;
  width: min(100%, 90rem);
  min-height: 1.8rem;
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
}

.terminal.is-ready .terminal__input-row {
  display: flex;
}

.terminal__prompt {
  flex: 0 0 auto;
  color: var(--green-soft);
}

.terminal__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--green);
  caret-color: var(--green);
  outline: none;
  text-shadow: 0 0 8px var(--green-dim);
}

.terminal__input::selection {
  background: var(--green);
  color: var(--black);
}

.terminal-line {
  min-height: 1.48em;
}

.terminal-link {
  color: var(--green-soft);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

@media (max-width: 42rem) {
  .intro__button {
    min-width: 7.25rem;
  }

  .terminal {
    padding: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .intro {
    transition-duration: 1ms;
  }

  .intro__button {
    transition: none;
  }
}