:root {
  /* Design font markers: IBM Plex Mono** Source Sans 3** */
  --obsidian: #050505;
  --ink: #111111;
  --ivory: #F4EFE4;
  --silver: #B8B8B8;
  --graphite: #3A3A3A;
  --platinum: #E7E7DF;
  --display: "Alegreya Sans", "Trebuchet MS", sans-serif;
  --body: "Source Sans 3", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-snap-type: y mandatory;
  background: var(--obsidian);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ivory);
  background: var(--obsidian);
  font-family: var(--body);
  overflow-x: hidden;
}

.logical-weather {
  position: fixed;
  inset: -20vh -20vw;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at var(--mx, 28%) var(--my, 30%), rgba(231,231,223,.24), transparent 18%),
    radial-gradient(circle at 72% 20%, rgba(184,184,184,.14), transparent 24%),
    radial-gradient(circle at 50% 72%, rgba(58,58,58,.76), transparent 34%),
    linear-gradient(125deg, #050505 0%, #111111 45%, #3A3A3A 72%, #050505 100%);
  filter: blur(18px);
  opacity: .78;
  animation: meshDrift 18s ease-in-out infinite alternate;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .28;
  background-image: repeating-linear-gradient(0deg, rgba(244,239,228,.03) 0 1px, transparent 1px 4px);
  mix-blend-mode: screen;
}

.terminal-magazine {
  position: relative;
  z-index: 2;
}

.spread {
  position: relative;
  min-height: 100vh;
  scroll-snap-align: start;
  display: grid;
  grid-template-columns: minmax(42px, 6vw) repeat(8, 1fr) 34px repeat(4, minmax(58px, .66fr)) minmax(28px, 4vw);
  gap: 0;
  padding: clamp(24px, 4vw, 66px) 0;
  background:
    linear-gradient(90deg, rgba(244,239,228,.025), transparent 10% 88%, rgba(244,239,228,.025)),
    radial-gradient(circle at 28% 62%, rgba(231,231,223,.08), transparent 34%);
  border-bottom: 1px solid rgba(184,184,184,.22);
}

.narrative-page {
  grid-column: 2 / span 8;
  align-self: stretch;
  min-height: calc(100vh - clamp(48px, 8vw, 132px));
  padding: clamp(26px, 4vw, 62px) clamp(18px, 3vw, 48px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid rgba(184,184,184,.35);
  border-top: 1px solid rgba(184,184,184,.16);
  background: linear-gradient(135deg, rgba(17,17,17,.72), rgba(5,5,5,.42));
  box-shadow: inset 0 0 80px rgba(0,0,0,.62);
}

.narrative-page.compact { justify-content: space-between; }

.annotation-rail {
  grid-column: 11 / span 4;
  align-self: stretch;
  min-height: calc(100vh - clamp(48px, 8vw, 132px));
  padding: clamp(22px, 3vw, 42px) clamp(16px, 2vw, 28px);
  border-right: 1px solid rgba(184,184,184,.34);
  border-top: 1px solid rgba(184,184,184,.16);
  background: rgba(17,17,17,.58);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.gutter {
  grid-column: 10;
  grid-row: 1;
  min-height: calc(100vh - clamp(48px, 8vw, 132px));
  align-self: center;
  display: flex;
  justify-content: center;
}

.gutter span {
  display: block;
  width: 1px;
  height: 100%;
  background: linear-gradient(transparent, #B8B8B8, transparent);
  box-shadow: 0 0 20px rgba(231,231,223,.38);
  transform: scaleY(.12);
  transform-origin: top;
  transition: transform 1.1s ease;
}

.spread.is-active .gutter span { transform: scaleY(1); }

.kicker, .rail-header, .command-line, .folio-number, .thesis-strip, .rule-stack, .final-command, .bracketed-fragment {
  font-family: var(--mono);
}

.kicker {
  margin: 0 0 18px;
  color: var(--silver);
  font-size: clamp(11px, 1vw, 14px);
  letter-spacing: .18em;
  text-transform: uppercase;
}

.display-title {
  margin: 0;
  max-width: 11ch;
  font-family: var(--display);
  font-size: clamp(76px, 15vw, 226px);
  font-weight: 900;
  line-height: .78;
  letter-spacing: -.065em;
  color: var(--ivory);
  text-shadow: 0 0 28px rgba(184,184,184,.18), 2px 0 0 rgba(231,231,223,.16);
}

.section-title {
  max-width: 8.6ch;
  font-size: clamp(58px, 10vw, 158px);
}

.typed-proposition {
  min-height: 1.4em;
  max-width: 760px;
  margin: clamp(24px, 4vw, 54px) 0 0;
  font-size: clamp(22px, 3vw, 42px);
  line-height: 1.02;
  font-weight: 600;
  color: var(--platinum);
}

.typed-proposition::after, .title-cursor, .left-cursor::after {
  animation: blink 1s steps(2, start) infinite;
}

.body-copy {
  max-width: 680px;
  margin: 36px 0 0;
  color: var(--platinum);
  font-size: clamp(20px, 2vw, 32px);
  line-height: 1.18;
}

.body-copy.large { font-size: clamp(26px, 3.2vw, 48px); }

.left-cursor {
  position: absolute;
  left: clamp(22px, 3.5vw, 54px);
  top: 50%;
  width: 18px;
  height: 54px;
  border-left: 2px solid var(--ivory);
  filter: drop-shadow(0 0 16px rgba(244,239,228,.9));
}

.left-cursor::after { content: ""; }

.thesis-strip {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 40px;
  color: var(--silver);
  font-size: 12px;
  letter-spacing: .08em;
}

.annotation-rail.dense { justify-content: space-between; }

.rail-header {
  color: var(--ivory);
  text-transform: uppercase;
  letter-spacing: .22em;
  font-size: 11px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--graphite);
}

.command-line {
  min-height: 1.4em;
  margin: 0;
  color: var(--silver);
  font-size: clamp(12px, 1.05vw, 15px);
  line-height: 1.45;
}

.command-line::after, .typed-proposition::after {
  content: "_";
  color: var(--ivory);
  margin-left: 2px;
}

.proof-card {
  margin-top: auto;
  border: 1px solid rgba(184,184,184,.32);
  padding: 22px;
  background: linear-gradient(145deg, rgba(244,239,228,.08), rgba(17,17,17,.48));
  box-shadow: 0 20px 70px rgba(0,0,0,.32);
}

.proof-card span {
  display: block;
  margin-bottom: 20px;
  font-family: var(--mono);
  color: var(--silver);
  font-size: 11px;
  letter-spacing: .16em;
}

.proof-card strong {
  display: block;
  color: var(--ivory);
  font-size: clamp(20px, 2vw, 30px);
  line-height: 1.04;
}

.proof-card.slim { margin-top: 20px; }

.folio-number {
  margin-top: 24px;
  color: rgba(231,231,223,.2);
  font-size: clamp(68px, 8vw, 120px);
  font-weight: 600;
  line-height: .8;
}

.rule-stack {
  display: grid;
  gap: 18px;
  color: var(--silver);
  font-size: 13px;
  line-height: 1.3;
}

.rule-stack span {
  padding: 12px 0;
  border-top: 1px solid var(--graphite);
}

.operator-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(70px, 1fr));
  max-width: 620px;
  margin-top: 36px;
  border: 1px solid rgba(184,184,184,.22);
}

.operator-grid div {
  min-height: 120px;
  display: grid;
  place-items: center;
  border-right: 1px solid rgba(184,184,184,.18);
  font-family: var(--mono);
  font-size: clamp(34px, 5vw, 72px);
  color: var(--platinum);
  background: rgba(17,17,17,.42);
}

.operator-grid div:last-child { border-right: 0; }

.spread-inverse .narrative-page {
  background: linear-gradient(155deg, rgba(244,239,228,.08), rgba(5,5,5,.86));
}

.contradiction-page .display-title { color: var(--platinum); }

.bracketed-fragment {
  margin-top: auto;
  color: var(--silver);
  font-size: clamp(16px, 1.5vw, 22px);
  border-top: 1px solid var(--graphite);
  padding-top: 22px;
}

.final-command {
  width: fit-content;
  margin-top: 42px;
  padding: 14px 18px;
  color: var(--obsidian);
  background: var(--platinum);
  box-shadow: 0 0 46px rgba(231,231,223,.25);
}

.page-mark {
  position: absolute;
  width: 28px;
  height: 28px;
  border-color: rgba(184,184,184,.52);
}

.top-left { top: 20px; left: 20px; border-top: 1px solid; border-left: 1px solid; }
.top-right { top: 20px; right: 20px; border-top: 1px solid; border-right: 1px solid; }
.bottom-left { bottom: 20px; left: 20px; border-bottom: 1px solid; border-left: 1px solid; }
.bottom-right { bottom: 20px; right: 20px; border-bottom: 1px solid; border-right: 1px solid; }

.folio-nav {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  display: grid;
  gap: 8px;
}

.folio-nav button {
  width: 42px;
  height: 26px;
  border: 1px solid rgba(184,184,184,.32);
  color: var(--silver);
  background: rgba(5,5,5,.58);
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: color .25s ease, border-color .25s ease, background .25s ease;
}

.folio-nav button.is-active {
  color: var(--obsidian);
  background: var(--ivory);
  border-color: var(--ivory);
}

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

@keyframes meshDrift {
  0% { transform: translate3d(-1%, -1%, 0) scale(1); }
  100% { transform: translate3d(2%, 1%, 0) scale(1.05); }
}

@media (max-width: 860px) {
  html { scroll-snap-type: none; }
  .spread {
    grid-template-columns: 22px 1fr 22px;
    padding: 22px 0 70px;
  }
  .narrative-page, .annotation-rail {
    grid-column: 2;
    min-height: auto;
  }
  .narrative-page { min-height: 62vh; }
  .annotation-rail { margin-top: 18px; }
  .gutter { display: none; }
  .display-title { font-size: clamp(64px, 22vw, 116px); }
  .section-title { font-size: clamp(54px, 17vw, 96px); }
  .folio-nav { right: 8px; }
  .left-cursor { display: none; }
  .operator-grid { grid-template-columns: repeat(2, 1fr); }
}