:root {
  color-scheme: dark;
  --ink: #0a0a0a;
  --ink-soft: #111211;
  --paper: #efeee9;
  --silver: #b6b7b3;
  --muted: #868883;
  --line: #2b2d2b;
  --line-light: #434642;
  --max: 82rem;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --section-space: clamp(5.5rem, 11vw, 10rem);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
  font-size: 1rem;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration-color: var(--line-light);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.35em;
}

a:hover {
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 0.35rem;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  transform: translateY(-180%);
  background: var(--paper);
  color: var(--ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
main > section,
footer {
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.75rem;
  gap: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.85rem;
  text-decoration: none;
}

.wordmark span:first-child {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.wordmark span:last-child {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
}

nav {
  display: none;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
}

nav a {
  color: var(--silver);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

nav a:hover {
  color: var(--paper);
}

.hero {
  display: grid;
  min-height: calc(100svh - 4.75rem);
  align-items: center;
  padding-block: clamp(5rem, 11vw, 9rem);
}

.kicker,
.section-number {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  margin: 0;
  font-size: clamp(6.25rem, 30vw, 13rem);
  font-weight: 420;
  letter-spacing: -0.075em;
  line-height: 0.78;
}

.hero-statement {
  max-width: 17ch;
  margin: 2.5rem 0 1.15rem;
  font-size: clamp(1.75rem, 6.4vw, 3.4rem);
  font-weight: 390;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

.hero-support {
  max-width: 39rem;
  margin: 0;
  color: var(--silver);
  font-size: clamp(1rem, 2.3vw, 1.16rem);
  line-height: 1.7;
}

.hero-mark {
  position: relative;
  width: min(100%, 34rem);
  margin: 4rem auto 0;
}

.hero-mark svg {
  display: block;
  width: 100%;
}

.hero-loop {
  fill: none;
  stroke: var(--line-light);
  stroke-width: 1.25;
}

.hero-loop-b {
  stroke: var(--muted);
}

.hero-cross {
  fill: var(--paper);
}

.hero-eight {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -51%);
  color: var(--paper);
  font-size: 1rem;
  font-weight: 600;
}

.ruled {
  padding-block: var(--section-space);
  border-top: 1px solid var(--line);
}

.section-intro {
  margin-bottom: clamp(3.5rem, 8vw, 7rem);
}

.section-intro h2 {
  max-width: 20ch;
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.75rem);
  font-weight: 390;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.model-comparison {
  display: grid;
  gap: 4.5rem;
}

.identity-model {
  display: grid;
  justify-items: start;
  gap: 0.7rem;
  font-size: clamp(2.1rem, 8vw, 5.6rem);
  font-weight: 390;
  letter-spacing: -0.045em;
  line-height: 0.95;
  text-transform: uppercase;
}

.identity-model span:nth-child(even) {
  color: var(--muted);
  font-size: 0.44em;
  font-weight: 300;
  line-height: 1;
}

.old-model {
  align-self: end;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.old-model p {
  margin: 0 0 0.75rem;
  font-size: 0.67rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.old-model div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
}

.letter-definitions {
  margin: 0;
}

.letter-definitions > div {
  display: grid;
  gap: 1.25rem;
  padding-block: 2.4rem;
  border-top: 1px solid var(--line);
}

.letter-definitions > div:last-child {
  border-bottom: 1px solid var(--line);
}

.letter-definitions dt {
  font-size: clamp(1.6rem, 4vw, 3rem);
  font-weight: 390;
  letter-spacing: -0.035em;
}

.letter-definitions dt span {
  display: inline-block;
  min-width: 1.55em;
  color: var(--muted);
}

.letter-definitions dd {
  max-width: 42rem;
  margin: 0;
  color: var(--silver);
}

.lifecycle-figure {
  margin: 0;
  padding: clamp(1rem, 3vw, 2.5rem) 0 0;
}

.lifecycle-figure svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.life-path {
  fill: none;
  stroke: var(--silver);
  stroke-width: 1.6;
  vector-effect: non-scaling-stroke;
}

#arrow path {
  fill: var(--silver);
}

.life-label text {
  fill: var(--paper);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-anchor: middle;
  text-transform: uppercase;
}

.crossing-ring {
  fill: var(--ink-soft);
  stroke: var(--line-light);
  stroke-width: 1;
}

.crossing-core {
  fill: var(--paper);
  transform-box: fill-box;
  transform-origin: center;
  animation: breathe 4.8s ease-in-out infinite;
}

.crossing text {
  fill: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-anchor: middle;
  text-transform: uppercase;
}

.lifecycle-figure figcaption {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.lifecycle-figure figcaption span:first-child {
  color: var(--paper);
  font-size: clamp(0.82rem, 2vw, 1rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lifecycle-figure figcaption span:last-child {
  max-width: 35rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.principle {
  padding-block: clamp(7rem, 15vw, 14rem);
}

.principle h2 {
  max-width: 25ch;
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 6rem);
  font-weight: 390;
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.principle h2 span {
  display: block;
  margin-bottom: 0.3em;
  color: var(--muted);
  font-size: 0.34em;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.origin-grid {
  display: grid;
  gap: clamp(4rem, 8vw, 8rem);
}

.origin-copy {
  max-width: 32rem;
  font-size: clamp(1.35rem, 3.2vw, 2.3rem);
  letter-spacing: -0.025em;
  line-height: 1.3;
}

.origin-copy p {
  margin: 0 0 1.4em;
}

.project-state {
  display: grid;
  align-content: start;
}

.project-state > div {
  padding-block: 1.65rem;
  border-top: 1px solid var(--line);
}

.project-state h3 {
  margin: 0 0 0.8rem;
  font-size: 0.73rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.project-state p {
  margin: 0;
  color: var(--silver);
}

.project-state .status-note {
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

footer p {
  margin: 0;
}

footer p span {
  margin-right: 0.65rem;
  color: var(--paper);
  font-weight: 700;
}

@keyframes breathe {
  0%, 100% { opacity: 0.55; transform: scale(0.82); }
  50% { opacity: 1; transform: scale(1); }
}

@media (min-width: 40rem) {
  nav {
    display: flex;
  }

  .hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
    gap: clamp(2rem, 6vw, 7rem);
  }

  .hero-mark {
    margin: 0;
  }

  .model-comparison {
    grid-template-columns: minmax(0, 1.35fr) minmax(14rem, 0.65fr);
  }

  .letter-definitions > div {
    grid-template-columns: minmax(12rem, 0.7fr) minmax(0, 1.3fr);
  }

  .lifecycle-figure figcaption,
  footer {
    grid-template-columns: 1fr 1fr;
  }

  footer {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 58rem) {
  .origin-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(22rem, 1.1fr);
  }
}

@media (max-width: 28rem) {
  .site-header {
    min-height: 4.25rem;
  }

  .wordmark span:last-child {
    display: none;
  }

  .hero {
    min-height: calc(100svh - 4.25rem);
  }

  .life-label text {
    font-size: 16px;
  }

  .crossing text {
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .crossing-core {
    animation: none;
  }
}