:root {
  --canvas: #f7f4ee;
  --elevated: #fffdf9;
  --trust: #fbf8f2;
  --final: #f3efe6;
  --ink: #252321;
  --body: #3c3834;
  --muted: #6e6963;
  --hairline: rgba(37, 35, 33, 0.12);
  --orange: #c74a14;
  --orange-press: #b34110;
  --violet: #7564d8;
  --shadow: 0 22px 50px rgba(37, 35, 33, 0.1), 0 2px 8px rgba(37, 35, 33, 0.05);
  --header: 68px;
  --shell: 1180px;
  --read: 660px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", sans-serif;
  font-size: 18px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; }

h1, h2, h3, p { margin: 0; }

h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.08;
}

.shell {
  width: min(var(--shell), calc(100% - 96px));
  margin-inline: auto;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 560;
  letter-spacing: -0.01em;
  line-height: 1;
  padding: 12px 16px;
  border-radius: 10px;
  border: 0;
}

.button:hover { background: var(--orange-press); }

.button:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header);
}

.site-header.is-scrolled {
  background: rgba(247, 244, 238, 0.88);
  backdrop-filter: blur(16px);
}

.header-bar {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 17px;
  font-weight: 560;
  letter-spacing: -0.02em;
}

.brand img { width: 22px; height: auto; }

.hero { padding: 104px 0 72px; }

.line-mask {
  display: block;
  overflow: hidden;
  padding-bottom: 0.08em;
}

.line-mask > span {
  display: block;
  transform: translateY(115%);
  animation: line-in 0.95s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero h1 .line-mask:nth-child(2) > span { animation-delay: 0.28s; }

.rise {
  opacity: 0;
  transform: translateY(14px);
  animation: rise-in 0.7s cubic-bezier(0.16, 1, 0.3, 1) var(--d, 0s) forwards;
}

.enter {
  opacity: 0;
  transform: translateY(18px);
}

.enter.is-in {
  animation: rise-in 0.75s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.proof > div:nth-child(2).is-in { animation-delay: 0.1s; }
.proof > div:nth-child(3).is-in { animation-delay: 0.18s; }

.sheen.enter.is-in {
  background-image: linear-gradient(
    105deg,
    var(--ink) 0%,
    var(--ink) 38%,
    var(--orange) 50%,
    var(--ink) 62%,
    var(--ink) 100%
  );
  background-size: 240% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation:
    rise-in 0.75s cubic-bezier(0.16, 1, 0.3, 1) forwards,
    sheen 2.6s cubic-bezier(0.16, 1, 0.3, 1) 0.15s forwards;
}

@keyframes line-in {
  to { transform: translateY(0); }
}

@keyframes rise-in {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sheen {
  from { background-position: 100% 0; }
  to { background-position: 0% 0; }
}

.hero-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 68px;
  max-width: 12ch;
  margin-bottom: 22px;
}

.lede {
  max-width: 500px;
  font-size: 20px;
  line-height: 1.5;
  color: var(--body);
  margin-bottom: 28px;
}

.trust-line,
.compat {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.trust-line { margin-top: 16px; }

.compat { margin-top: 6px; }

.hero-figure { margin: 0; }

.hero-figure img,
.loop-stage img,
.step-figure img,
.retrieval-figure img {
  width: 100%;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.keycaps {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.keycaps span,
kbd {
  font-family: inherit;
  font-size: 13px;
  color: var(--muted);
  background: var(--elevated);
  border: 1px solid var(--hairline);
  border-radius: 7px;
  padding: 3px 7px;
}

.editorial { padding: 168px 0; }

.editorial-column {
  max-width: var(--read);
  margin-left: 8%;
}

.editorial h2,
.distinction h2,
.retrieval h2,
.trust h2,
.final h2 {
  font-size: 48px;
  margin-bottom: 24px;
}

.editorial p,
.distinction p,
.section-copy,
.final p,
.step p {
  color: var(--body);
  max-width: 58ch;
}

.editorial p + p,
.distinction p + p,
.section-copy + .section-copy,
.step p + p { margin-top: 16px; }

.statement {
  color: var(--ink);
  font-weight: 600;
  margin-top: 28px;
}

.loop { padding-bottom: 80px; }

.loop-grid {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: 48px;
  align-items: start;
}

.step {
  min-height: 78vh;
  padding-top: 8vh;
}

.step-name {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
}

.step.is-on .step-name { color: var(--violet); }

.step h3 {
  font-size: 30px;
  margin-bottom: 16px;
}

.step-constraint {
  font-weight: 600;
  color: var(--ink);
}

.step-figure { display: none; }

.loop-stage {
  position: sticky;
  top: 18vh;
  min-height: 420px;
}

.loop-stage img {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 320ms ease;
}

.loop-stage img.is-on { opacity: 1; }

.loop-close {
  margin-top: 12px;
  font-weight: 600;
  font-size: 18px;
}

.distinction {
  padding: 148px 0 40px;
  border-top: 1px solid var(--hairline);
}

.distinction-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}

.distinction h2 { margin-bottom: 0; }

.retrieval { padding: 140px 0; }

.retrieval-figure { margin: 40px 0 0; }

.trust {
  background: var(--trust);
  padding: 128px 0;
}

.proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--hairline);
}

.proof h3 {
  font-size: 17px;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.proof p {
  color: var(--body);
  font-size: 16px;
  max-width: 28ch;
}

.compat-block {
  margin-top: 36px;
  max-width: 62ch;
}

.final {
  background: var(--final);
  padding: 156px 0 140px;
}

.final-column { max-width: 720px; }

.final p { margin-bottom: 28px; }

@media (max-width: 1199px) {
  .hero h1 { font-size: 56px; }
  .editorial h2,
  .distinction h2,
  .retrieval h2,
  .trust h2,
  .final h2 { font-size: 42px; }
}

@media (max-width: 899px) {
  .shell { width: min(var(--shell), calc(100% - 48px)); }
  .hero { padding-top: 64px; }
  .hero-grid,
  .loop-grid,
  .distinction-grid { grid-template-columns: 1fr; }
  .hero h1 { max-width: 14ch; font-size: 46px; }
  .editorial { padding: 96px 0; }
  .editorial-column { margin-left: 0; }
  .step {
    min-height: 0;
    padding: 0 0 64px;
  }
  .step-figure { display: block; margin: 28px 0 0; }
  .loop-stage { display: none; }
  .distinction { padding-top: 96px; }
  .retrieval,
  .trust { padding: 96px 0; }
  .final { padding: 96px 0; }
  .proof { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 640px) {
  .shell { width: min(var(--shell), calc(100% - 40px)); }
  .header-bar .button { padding: 10px 12px; font-size: 14px; }
  .hero h1 { font-size: 40px; }
  .lede { font-size: 18px; }
  .editorial h2,
  .distinction h2,
  .retrieval h2,
  .trust h2,
  .final h2 { font-size: 34px; }
  .button { width: 100%; }
  .header-bar .button { width: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .loop-stage img { transition: none; }
  .line-mask > span,
  .rise,
  .enter,
  .enter.is-in,
  .sheen.enter.is-in {
    animation: none;
    opacity: 1;
    transform: none;
    background: none;
    -webkit-text-fill-color: var(--ink);
    color: var(--ink);
  }
}