:root {
  color-scheme: dark;
  --ink: #080808;
  --paper: #f4f1eb;
  --muted: #9d9a92;
  --line: rgba(244, 241, 235, 0.17);
  --accent: #ff4e2f;
  --display-font: "Syne", Inter, ui-sans-serif, sans-serif;
  --pointer-x: 50%;
  --pointer-y: 50%;
  --move-x: 0px;
  --move-y: 0px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--ink);
  color: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { min-width: 20rem; background: var(--ink); }

body {
  margin: 0;
  min-height: 100svh;
  background:
    radial-gradient(circle at var(--pointer-x) var(--pointer-y), rgba(255, 78, 47, 0.085), transparent 30rem),
    var(--ink);
  color: var(--paper);
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 50;
  top: 1rem;
  left: 1rem;
  padding: 0.75rem 1rem;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.8rem;
  transform: translateY(-180%);
}

.skip-link:focus { transform: translateY(0); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }

.corner-nav {
  position: fixed;
  z-index: 20;
  top: clamp(1.4rem, 3.5vw, 3.25rem);
  right: clamp(1.4rem, 3.5vw, 3.25rem);
  display: flex;
  gap: 1.5rem;
}

.corner-nav a {
  color: var(--muted);
  font: 0.73rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: color 180ms ease;
}

.corner-nav a:hover { color: var(--accent); }

.ambient-field {
  position: fixed;
  z-index: 0;
  inset: -30vmax;
  overflow: hidden;
  pointer-events: none;
  filter: blur(1px);
}

.ambient-field i {
  position: absolute;
  display: block;
  border-radius: 50%;
  opacity: 0.75;
  will-change: transform;
}

.ambient-field i:nth-child(1) {
  width: 72vmax;
  height: 72vmax;
  left: 5%;
  top: 10%;
  background: radial-gradient(circle, rgba(255, 78, 47, 0.09), rgba(255, 78, 47, 0) 63%);
  animation: drift-one 19s ease-in-out infinite alternate;
}

.ambient-field i:nth-child(2) {
  width: 54vmax;
  height: 54vmax;
  right: 4%;
  bottom: 3%;
  background: radial-gradient(circle, rgba(244, 241, 235, 0.047), rgba(244, 241, 235, 0) 67%);
  animation: drift-two 26s ease-in-out infinite alternate;
}

.ambient-field i:nth-child(3) {
  width: 1px;
  height: 130vmax;
  left: 52%;
  top: -15%;
  border-radius: 0;
  background: linear-gradient(transparent, rgba(255, 78, 47, 0.22), transparent);
  transform: rotate(19deg);
  animation: scan-line 15s ease-in-out infinite alternate;
}

.signal-stage {
  position: relative;
  z-index: 2;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(4rem, 8vw, 8rem) clamp(1.2rem, 4vw, 4rem);
  overflow: clip;
}

.signal-equation {
  margin: 0;
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  justify-content: center;
  column-gap: clamp(0.75rem, 2.1vw, 2.5rem);
  row-gap: clamp(0.9rem, 2vw, 2rem);
  white-space: nowrap;
  transform: translate3d(var(--move-x), var(--move-y), 0);
  transition: transform 900ms cubic-bezier(0.16, 1, 0.3, 1), opacity 700ms ease, filter 900ms ease;
}

.equation-label {
  grid-column: 1 / -1;
  font-family: var(--display-font);
  font-size: clamp(3.25rem, 8.5vw, 8.5rem);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.08em;
  text-align: center;
}

.equation-equals {
  color: var(--accent);
  font: 500 clamp(2rem, 4vw, 5rem)/1 var(--display-font);
}

.equation-value {
  min-width: 2.55ch;
  color: var(--paper);
  font: 600 clamp(6.75rem, 21vw, 18rem)/0.84 var(--display-font);
  letter-spacing: -0.09em;
  font-variant-numeric: tabular-nums lining-nums;
  text-align: left;
}

.equation-value::after {
  content: "%";
  display: inline-block;
  margin-left: 0.04em;
  font-size: 0.38em;
  letter-spacing: 0;
  vertical-align: top;
  transform: translateY(0.13em);
}

.js .signal-equation {
  opacity: 0;
  filter: blur(18px);
  transform: translate3d(var(--move-x), calc(var(--move-y) + 2rem), 0) scale(0.92);
}

.js.is-counting .signal-equation,
.js.is-settled .signal-equation {
  opacity: 1;
  filter: blur(0);
  transform: translate3d(var(--move-x), var(--move-y), 0) scale(1);
}

.equation-value.is-flipping { animation: number-flip 72ms linear both; }

.boot-screen {
  position: fixed;
  z-index: 15;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 1.5rem;
  pointer-events: none;
  transition: opacity 650ms ease, transform 900ms cubic-bezier(0.16, 1, 0.3, 1), filter 700ms ease;
}

.boot-screen[hidden] { display: none; }

.boot-orb {
  position: relative;
  display: grid;
  place-items: center;
  width: clamp(13rem, 26vw, 21rem);
  aspect-ratio: 1;
  animation: orb-hover 2.4s ease-in-out infinite alternate;
}

.boot-orb img {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 0 2.3rem rgba(255, 78, 47, 0.13));
  animation: orb-breathe 1.35s ease-in-out infinite alternate;
}

.boot-orb::before,
.boot-orb::after {
  content: "";
  position: absolute;
  inset: 5%;
  border-radius: 50%;
  pointer-events: none;
}

.boot-orb::before {
  border: 1px solid rgba(255, 78, 47, 0.2);
  animation: orb-pulse 1.8s ease-out infinite;
}

.boot-orb::after {
  border: 1px solid transparent;
  border-top-color: rgba(255, 78, 47, 0.58);
  border-right-color: rgba(244, 241, 235, 0.12);
  animation: orb-orbit 3.2s linear infinite;
}

.boot-label {
  color: var(--muted);
  font: 0.69rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.14em;
}

.is-counting .boot-screen,
.is-settled .boot-screen {
  opacity: 0;
  filter: blur(16px);
  transform: scale(1.55);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Why */
.story-page {
  min-height: 100svh;
  background:
    radial-gradient(circle at 75% 10%, rgba(255, 78, 47, 0.075), transparent 27rem),
    var(--ink);
}

.story-header {
  min-height: 6rem;
  margin-inline: clamp(1.25rem, 4vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  font: 0.72rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.1em;
}

.story-header a { text-decoration: none; }
.story-header a:hover { color: var(--accent); }
.story-mark { font-weight: 700; }
.story-mark span { color: var(--accent); }

.story-shell {
  width: min(100%, 87rem);
  margin-inline: auto;
  padding: clamp(4rem, 10vh, 8rem) clamp(1.25rem, 4vw, 4rem) clamp(6rem, 12vh, 11rem);
  display: grid;
  grid-template-columns: minmax(6rem, 0.3fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 5rem);
}

.story-index,
.story-kicker {
  color: var(--accent);
  font: 0.72rem/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.12em;
}

.story-copy { max-width: 58rem; }

.story-copy h1 {
  margin: 0 0 clamp(4rem, 10vh, 8rem);
  max-width: 12ch;
  font-family: var(--display-font);
  font-size: clamp(3.5rem, 8.3vw, 8.75rem);
  font-weight: 540;
  line-height: 0.88;
  letter-spacing: -0.075em;
}

.story-copy .lead {
  max-width: 36ch;
  font-family: var(--display-font);
  font-size: clamp(1.6rem, 3.2vw, 2.75rem);
  line-height: 1.17;
  letter-spacing: -0.045em;
}

.story-copy p {
  max-width: 43rem;
  margin: 1.7rem 0;
  color: #cbc8c0;
  font-size: 1.08rem;
  line-height: 1.75;
}

.story-copy blockquote {
  margin: clamp(4.5rem, 10vh, 8rem) 0;
  padding: 1.8rem 0 1.8rem clamp(1.4rem, 3.5vw, 3.2rem);
  border-left: 3px solid var(--accent);
  font-family: var(--display-font);
  font-size: clamp(2.2rem, 5.1vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.names {
  margin: clamp(4rem, 9vh, 7rem) 0 2rem;
  padding-block: 1.4rem;
  border-block: 1px solid var(--line);
  color: var(--paper);
  font: 500 clamp(1.55rem, 3.4vw, 3rem)/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: -0.055em;
}

.story-copy .closing {
  margin-top: clamp(4.5rem, 10vh, 8rem);
  color: var(--paper);
  font-family: var(--display-font);
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 1.06;
  letter-spacing: -0.055em;
}

.story-back {
  display: inline-block;
  margin-top: 4rem;
  color: var(--accent);
  font: 0.76rem/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace;
  text-underline-offset: 0.35rem;
}

/* How */
.how-page {
  min-height: 100svh;
  background:
    radial-gradient(circle at 18% 5%, rgba(255, 78, 47, 0.075), transparent 30rem),
    var(--ink);
}

.how-shell {
  width: min(100%, 87rem);
  margin-inline: auto;
  padding: clamp(4rem, 10vh, 8rem) clamp(1.25rem, 4vw, 4rem) clamp(6rem, 12vh, 10rem);
}

.how-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
  margin-bottom: clamp(5rem, 12vh, 10rem);
}

.how-intro h1 {
  margin: 0;
  max-width: 11ch;
  font-family: var(--display-font);
  font-size: clamp(3.6rem, 8.2vw, 8.5rem);
  font-weight: 540;
  line-height: 0.88;
  letter-spacing: -0.075em;
}

.how-intro p {
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--paper);
  color: #cbc8c0;
  font-size: 1.05rem;
  line-height: 1.68;
}

.how-grid { border-top: 1px solid var(--line); }

.how-step {
  display: grid;
  grid-template-columns: 4rem minmax(11rem, 0.48fr) minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 4rem);
  padding: clamp(2rem, 5vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
}

.how-step > span {
  color: var(--accent);
  font: 0.72rem/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.how-step h2 {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(1.5rem, 2.7vw, 2.5rem);
  font-weight: 520;
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.how-step p {
  margin: 0;
  max-width: 46rem;
  color: #c8c5bd;
  font-size: 1rem;
  line-height: 1.7;
}

.how-note {
  max-width: 48rem;
  margin: clamp(4rem, 9vh, 7rem) 0 0 auto;
  color: var(--muted);
  font: 0.78rem/1.7 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.how-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.3rem;
  margin-top: 2rem;
}

.how-sources a {
  color: var(--muted);
  font: 0.72rem/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace;
  text-underline-offset: 0.3rem;
}

.how-sources a:hover { color: var(--accent); }

@keyframes drift-one {
  from { transform: translate3d(-4%, -2%, 0) scale(0.92); }
  to { transform: translate3d(9%, 6%, 0) scale(1.08); }
}

@keyframes drift-two {
  from { transform: translate3d(7%, 2%, 0) scale(1.06); }
  to { transform: translate3d(-9%, -7%, 0) scale(0.9); }
}

@keyframes scan-line {
  from { transform: translateX(-12vw) rotate(19deg); opacity: 0.25; }
  to { transform: translateX(14vw) rotate(19deg); opacity: 0.85; }
}

@keyframes orb-hover {
  from { transform: translateY(0) rotate(-3deg); }
  to { transform: translateY(-0.45rem) rotate(3deg); }
}

@keyframes orb-breathe {
  from { transform: scale(0.96); opacity: 0.84; }
  to { transform: scale(1.045); opacity: 1; }
}

@keyframes orb-pulse {
  0% { transform: scale(0.86); opacity: 0.55; }
  80%, 100% { transform: scale(1.18); opacity: 0; }
}

@keyframes orb-orbit {
  to { transform: rotate(360deg); }
}

@keyframes number-flip {
  0% { opacity: 0.25; filter: blur(8px); transform: translateY(0.08em); }
  100% { opacity: 1; filter: blur(0); transform: translateY(0); }
}

@media (max-width: 680px) {
  .signal-equation {
    row-gap: 1.25rem;
  }

  .equation-label {
    font-size: clamp(2.75rem, 13vw, 5.5rem);
  }

  .equation-equals { font-size: clamp(2.2rem, 10vw, 4rem); }
  .equation-value { font-size: clamp(5.4rem, 25vw, 9.4rem); }
  .story-shell { grid-template-columns: 1fr; }
  .story-index { margin-bottom: 0.5rem; }
  .how-intro { grid-template-columns: 1fr; }
  .how-step { grid-template-columns: 2rem minmax(0, 1fr); }
  .how-step p { grid-column: 2; }
}

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

  .ambient-field { opacity: 0.55; }
}