:root {
  --bg: #f4f4f4;
  --ink: #0e0e0e;
  --accent: #ff3131;
  --line: #151515;
  --soft: #b8b8b8;
}

body.dark {
  --bg: #0f0f10;
  --ink: #f5f5f5;
  --accent: #41e8ff;
  --line: #f0f0f0;
  --soft: #696969;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  font-family: "IBM Plex Mono", monospace;
  color: var(--ink);
  background: var(--bg);
  transition: background-color 220ms ease, color 220ms ease;
  min-height: 100vh;
}

.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgba(0, 0, 0, 0.03) 4px
  );
  mix-blend-mode: multiply;
  opacity: 0.3;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 99;
  background: var(--bg);
  border-bottom: 2px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
}

.meta {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.theme-toggle {
  border: 2px solid var(--line);
  background: transparent;
  color: var(--ink);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  font: inherit;
}

main {
  border-left: 2px solid var(--line);
  border-right: 2px solid var(--line);
  margin: 0 auto;
  width: min(1280px, 100%);
}

section {
  padding: clamp(1rem, 2.2vw, 1.6rem);
  border-bottom: 2px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  filter: blur(2px);
  transition:
    opacity 420ms ease,
    transform 420ms ease,
    filter 420ms ease;
}

section.in-view {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

@media (prefers-reduced-motion: reduce) {
  section {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }
}

.chapter {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
}

.hero {
  min-height: 78vh;
  display: grid;
  align-content: start;
  gap: 0.5rem;
}

h1 {
  margin: 0;
  font-family: "Staatliches", sans-serif;
  font-size: clamp(3.2rem, 14vw, 13rem);
  line-height: 0.88;
  letter-spacing: 0.02em;
}

.deck {
  margin: 0;
  max-width: 62ch;
  font-family: "Fraunces", serif;
  font-variation-settings: "SOFT" 40, "WONK" 0;
  font-size: clamp(1rem, 2vw, 1.35rem);
}

.line {
  margin-top: 1rem;
  height: 3px;
  background: var(--accent);
  width: 30%;
  animation: lineGrow 2.2s ease-in-out infinite alternate;
}

@keyframes lineGrow {
  from { width: 14%; }
  to { width: 68%; }
}

.ticker-wrap {
  overflow: hidden;
  padding: 0;
}

.ticker {
  display: flex;
  gap: 2rem;
  white-space: nowrap;
  padding: 0.8rem 1rem;
  font-family: "Staatliches", sans-serif;
  font-size: clamp(1.2rem, 4vw, 2.8rem);
  animation: run 16s linear infinite;
}

.ticker span {
  color: var(--accent);
}

@keyframes run {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.lab {
  display: grid;
  gap: 1rem;
}

.verbs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 2px solid var(--line);
}

.verb {
  border: 0;
  border-right: 2px solid var(--line);
  background: transparent;
  color: var(--ink);
  padding: 1rem 0.5rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.verb:last-child { border-right: 0; }

.verb.active {
  background: var(--ink);
  color: var(--bg);
}

.output-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 2px solid var(--line);
}

.output-word {
  margin: 0;
  padding: 0.8rem;
  border-right: 2px solid var(--line);
  font-family: "Staatliches", sans-serif;
  font-size: clamp(2rem, 10vw, 9rem);
  line-height: 0.9;
  color: var(--accent);
}

.output-note {
  margin: 0;
  padding: 0.8rem;
  font-family: "Fraunces", serif;
  font-size: clamp(1rem, 2.4vw, 1.7rem);
  align-self: end;
}

.index ol {
  list-style: none;
  margin: 0.8rem 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.index li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  align-items: center;
  margin: 0;
  padding: 0.9rem 0.2rem;
  border-bottom: 2px solid var(--line);
  font-family: "Staatliches", sans-serif;
  font-size: clamp(1.45rem, 4vw, 4rem);
  cursor: pointer;
  transition: letter-spacing 140ms ease;
}

.index li span {
  font-family: "IBM Plex Mono", monospace;
  font-size: clamp(0.8rem, 1.4vw, 1rem);
  letter-spacing: 0.08em;
}

.index li:hover {
  letter-spacing: 0.02em;
}

.index-copy {
  margin: 0;
  color: var(--soft);
}

.playfield {
  margin-top: 0.7rem;
  position: relative;
  border: 2px solid var(--line);
  min-height: 250px;
}

#target {
  position: absolute;
  width: 56px;
  height: 56px;
  border: 2px solid var(--line);
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  transform: translate(-50%, -50%);
}

.score {
  margin: 0.8rem 0 0;
  font-family: "Staatliches", sans-serif;
  font-size: clamp(1.2rem, 3vw, 2.4rem);
}

@media (max-width: 900px) {
  .verbs { grid-template-columns: repeat(2, 1fr); }
  .verb:nth-child(2n) { border-right: 0; }
  .verb:nth-child(-n+2) { border-bottom: 2px solid var(--line); }
  .output-grid { grid-template-columns: 1fr; }
  .output-word { border-right: 0; border-bottom: 2px solid var(--line); }
}