:root {
  color-scheme: light;
  --paper: oklch(0.992 0.004 225);
  --paper-alt: oklch(0.965 0.009 225);
  --paper-warm: oklch(0.972 0.016 76);
  --ink: oklch(0.205 0.026 245);
  --ink-soft: oklch(0.405 0.028 245);
  --navy: oklch(0.305 0.078 245);
  --navy-strong: oklch(0.235 0.064 245);
  --cyan: oklch(0.64 0.128 220);
  --cyan-soft: oklch(0.91 0.037 220);
  --coral: oklch(0.65 0.172 24);
  --amber: oklch(0.79 0.146 78);
  --green: oklch(0.57 0.118 151);
  --line: oklch(0.79 0.026 225);
  --line-strong: oklch(0.64 0.042 225);
  --focus: oklch(0.67 0.17 72);
  --display: "Bahnschrift", "Arial Narrow", Arial, sans-serif;
  --body: "Segoe UI", Aptos, Arial, sans-serif;
  --mono: "Cascadia Mono", Consolas, monospace;
  --page: min(74rem, calc(100vw - 2rem));
  --measure: 68ch;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
  --space-3xl: 6rem;
  --shadow-paper: 0 1.5rem 3.5rem oklch(0.26 0.045 245 / 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  padding:
    env(safe-area-inset-top)
    env(safe-area-inset-right)
    env(safe-area-inset-bottom)
    env(safe-area-inset-left);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1rem;
  font-kerning: normal;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

h1,
h2,
h3 {
  font-family: var(--display);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  background: var(--amber);
  color: var(--navy-strong);
  font-weight: 800;
  transform: translateY(-180%);
}

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

.site-header {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 1rem;
  padding: 1.1rem max(1rem, calc((100vw - 74rem) / 2));
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.author-mark {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.1;
}

.author-mark__name {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.author-mark__role {
  margin-top: 0.3rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.075em;
  text-transform: uppercase;
}

.primary-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: 100%;
  gap: 0.5rem 1rem;
  font-size: 0.84rem;
  font-weight: 700;
}

.primary-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  text-decoration: none;
  text-underline-offset: 0.35rem;
}

.primary-nav__cta {
  justify-content: center;
  padding: 0.65rem 0.85rem;
  background: var(--navy);
  color: var(--paper);
}

.hero {
  display: grid;
  gap: var(--space-xl);
  padding: var(--space-2xl) max(1rem, calc((100vw - 82rem) / 2));
  border-bottom: 1px solid var(--line);
}

.hero__copy {
  align-self: center;
}

.eyebrow,
.section-index {
  margin-bottom: 1rem;
  color: var(--navy);
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 11ch;
  margin-left: -0.035em;
  margin-bottom: var(--space-md);
  font-size: clamp(3rem, 13vw, 5.6rem);
  font-weight: 760;
  letter-spacing: -0.055em;
  line-height: 0.94;
}

h2 {
  max-width: 15ch;
  margin-left: -0.025em;
  margin-bottom: var(--space-md);
  font-size: clamp(2.25rem, 8vw, 4.25rem);
  font-weight: 740;
  letter-spacing: -0.045em;
  line-height: 0.99;
}

h3 {
  margin-bottom: 0.35rem;
  font-size: 1.14rem;
  font-weight: 760;
  line-height: 1.18;
}

.hero__lead {
  max-width: 56ch;
  margin-bottom: 1rem;
  color: var(--ink);
  font-size: clamp(1.16rem, 3.3vw, 1.45rem);
  line-height: 1.48;
}

.founder-line {
  max-width: 58ch;
  margin-bottom: var(--space-lg);
  padding: 1rem 0;
  border-top: 1px solid var(--coral);
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.96rem;
}

.hero__actions {
  display: flex;
  align-items: stretch;
  flex-direction: column;
  gap: 1rem;
}

.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--display);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 180ms cubic-bezier(0.16, 1, 0.3, 1),
    background-color 180ms ease-out,
    color 180ms ease-out;
}

.button--primary {
  background: var(--navy);
  color: var(--paper);
}

.button--purchase {
  width: 100%;
  margin-top: 0.5rem;
  background: var(--navy-strong);
  color: var(--paper);
}

.text-link {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  width: fit-content;
  color: var(--navy);
  font-weight: 750;
  text-decoration-color: var(--coral);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.4rem;
}

.spec-line {
  display: grid;
  margin: var(--space-xl) 0 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.spec-line div {
  padding: 0.9rem 0;
}

.spec-line div + div {
  border-top: 1px solid var(--line);
}

.spec-line dt {
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.spec-line dd {
  margin: 0.2rem 0 0;
  font-family: var(--display);
  font-size: 1.08rem;
  font-weight: 780;
}

.hero__artifact {
  width: 100%;
  max-width: 38rem;
  margin: 0 auto;
}

.artifact-stage {
  padding: clamp(0.55rem, 1.2vw, 0.9rem);
  background-color: var(--paper-alt);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
  border: 1px solid var(--line);
}

.artifact-stage img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-paper);
}

figcaption {
  margin-top: 0.8rem;
  color: var(--ink-soft);
  font-size: 0.8rem;
  line-height: 1.5;
}

.field-rule {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 1.5rem max(1rem, calc((100vw - 74rem) / 2));
  background: var(--paper-warm);
  border-bottom: 1px solid var(--line);
}

.field-rule p {
  margin-bottom: 0;
}

.field-rule__label {
  color: var(--coral);
  font-family: var(--display);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.field-rule > p:last-child {
  max-width: 50ch;
  font-family: var(--display);
  font-size: clamp(1.22rem, 4vw, 1.6rem);
  font-weight: 700;
  line-height: 1.35;
}

.proof-section,
.inside-section,
.method-section,
.ai-section,
.licence-section,
.purchase-section,
.faq-section {
  padding: var(--space-3xl) max(1rem, calc((100vw - 74rem) / 2));
}

.inside-section,
.ai-section,
.purchase-section {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  gap: 0.25rem;
  margin-bottom: var(--space-xl);
}

.section-heading > p:last-child {
  max-width: var(--measure);
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 1.04rem;
}

.section-heading--compact {
  margin-bottom: var(--space-xl);
}

.product-spread {
  display: grid;
  gap: var(--space-lg);
}

.product-spread figure {
  display: grid;
  justify-items: center;
  margin: 0;
}

.product-spread img,
.handoff-figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  box-shadow: 0 1rem 2.4rem oklch(0.26 0.045 245 / 0.1);
}

.product-spread img {
  width: 100%;
  max-width: 31rem;
  aspect-ratio: 1985 / 2807;
  max-height: calc(100svh - 3rem);
  object-fit: contain;
}

.product-spread figcaption {
  width: min(100%, 31rem);
}

.proof-ledger {
  margin-top: var(--space-xl);
  border-top: 1px solid var(--line-strong);
}

.proof-ledger div {
  display: grid;
  gap: 0.45rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.proof-ledger span {
  color: var(--navy);
  font-family: var(--display);
  font-weight: 800;
}

.proof-ledger p {
  max-width: 66ch;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.deliverable-ledger {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.deliverable-ledger li {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: start;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.deliverable-ledger__number {
  color: var(--coral);
  font-family: var(--display);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.deliverable-ledger p {
  max-width: 68ch;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.deliverable-ledger li > strong {
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

.method-line {
  display: grid;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.method-line li {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.method-line span {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--coral);
  font-family: var(--display);
  font-size: 0.82rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.method-line strong {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--display);
  font-size: 1.25rem;
}

.method-line p {
  max-width: 50ch;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.ai-section {
  display: grid;
  gap: var(--space-xl);
}

.ai-section__copy {
  align-self: center;
}

.ai-section__copy > p:not(.section-index) {
  max-width: 62ch;
  color: var(--ink-soft);
}

.ai-section__lead {
  color: var(--ink) !important;
  font-size: clamp(1.15rem, 3.2vw, 1.4rem);
  font-weight: 650;
}

.handoff-figure {
  width: 100%;
  max-width: 29rem;
  margin: 0 auto;
}

.boundary-columns {
  display: grid;
  gap: var(--space-lg);
  border-top: 1px solid var(--line-strong);
}

.boundary-columns section {
  padding-top: var(--space-lg);
}

.boundary-columns ul,
.price-panel ul {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.boundary-columns li,
.price-panel li {
  margin-bottom: 0.7rem;
}

.purchase-section {
  display: grid;
  gap: var(--space-xl);
}

.purchase-section__copy {
  align-self: center;
}

.purchase-section__copy > p:not(.section-index) {
  max-width: 58ch;
  color: var(--ink-soft);
}

.purchase-note {
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-strong);
  color: var(--ink) !important;
  font-weight: 650;
}

.price-panel {
  padding: clamp(1.5rem, 6vw, 3rem);
  background: var(--paper);
  border: 1px solid var(--line-strong);
}

.price-panel__licence {
  margin-bottom: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 750;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.price-panel__price {
  margin-bottom: 0;
  color: var(--coral);
  font-family: var(--display);
  font-size: clamp(4.5rem, 18vw, 7.5rem);
  font-weight: 800;
  letter-spacing: -0.065em;
  line-height: 0.95;
  font-variant-numeric: tabular-nums;
}

.price-panel__price span {
  margin-right: 0.15em;
  font-size: 0.43em;
  vertical-align: top;
}

.price-panel__tax {
  max-width: 42ch;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.price-panel ul {
  margin-bottom: 1.5rem;
}

.checkout-form {
  display: grid;
  gap: 1.4rem;
  margin-top: 1.75rem;
}

.checkout-form fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.checkout-form legend {
  width: 100%;
  margin-bottom: 0.9rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line-strong);
  color: var(--navy-strong);
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 780;
}

.checkout-form__grid,
.checkout-business-fields {
  display: grid;
  gap: 1rem;
}

.checkout-business-fields[hidden] {
  display: none;
}

.checkout-field {
  display: grid;
  gap: 0.42rem;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
}

.checkout-field input,
.checkout-field select {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
}

.checkout-form__consent {
  display: grid;
  gap: 0.85rem;
}

.checkout-check {
  display: grid;
  grid-template-columns: 1.2rem 1fr;
  gap: 0.72rem;
  align-items: start;
  color: var(--ink);
  font-size: 0.84rem;
  line-height: 1.45;
}

.checkout-check input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0.16rem 0 0;
  accent-color: var(--cyan);
}

.checkout-check a {
  color: var(--navy);
  font-weight: 760;
  text-underline-offset: 0.16em;
}

.checkout-check--optional {
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.checkout-honeypot {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  clip-path: inset(50%);
  white-space: nowrap;
}

.checkout-status {
  min-height: 2.75rem;
  margin: 0.8rem 0 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.checkout-status.is-active {
  color: var(--green);
  font-weight: 750;
}

.checkout-status.is-error {
  color: var(--coral);
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  min-height: 4rem;
  padding: 1.15rem 2.2rem 1.15rem 0;
  font-family: var(--display);
  font-size: 1.06rem;
  font-weight: 760;
  cursor: pointer;
}

.faq-list details p {
  max-width: 68ch;
  padding: 0 0 1.25rem;
  color: var(--ink-soft);
}

.site-footer {
  display: grid;
  gap: var(--space-lg);
  padding: var(--space-xl) max(1rem, calc((100vw - 74rem) / 2));
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.site-footer p {
  margin-bottom: 0.25rem;
}

.site-footer__name {
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 800;
}

.site-footer__stamp {
  color: var(--navy);
  font-family: var(--mono);
  font-weight: 700;
}

@media (hover: hover) and (pointer: fine) {
  .primary-nav a:hover {
    text-decoration: underline;
  }

  .primary-nav__cta:hover {
    background: var(--navy-strong);
    text-decoration: none !important;
  }

  .button:hover {
    transform: translateY(-2px);
  }

  .button--primary:hover,
  .button--purchase:hover {
    background: var(--navy);
  }
}

@media (min-width: 45rem) {
  :root {
    --page: min(74rem, calc(100vw - 3rem));
  }

  .site-header {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
    min-height: 5.25rem;
  }

  .primary-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    width: auto;
    gap: clamp(1rem, 2.2vw, 2rem);
  }

  .hero__actions {
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .spec-line {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .spec-line div {
    padding: 0.9rem 1rem;
  }

  .spec-line div:first-child {
    padding-left: 0;
  }

  .spec-line div + div {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .field-rule {
    grid-template-columns: minmax(9rem, 0.28fr) minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-xl);
    padding-block: 2rem;
  }

  .section-heading {
    grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr);
    column-gap: var(--space-xl);
  }

  .section-heading h2 {
    grid-column: 2;
  }

  .section-heading > p:last-child {
    grid-column: 2;
  }

  .section-heading--compact {
    grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr);
  }

  .product-spread {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
  }

  .proof-ledger div {
    grid-template-columns: minmax(8rem, 0.22fr) minmax(0, 1fr);
    gap: 2rem;
  }

  .method-line {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .method-line li {
    padding: 1.5rem 1.1rem;
    border-right: 1px solid var(--line);
  }

  .method-line li:first-child {
    padding-left: 0;
  }

  .method-line li:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .ai-section,
  .purchase-section {
    grid-template-columns: minmax(0, 1.02fr) minmax(19rem, 0.62fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
  }

  .boundary-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-xl);
  }

  .boundary-columns section + section {
    padding-left: var(--space-xl);
    border-left: 1px solid var(--line);
  }

  .site-footer {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer > div:last-child {
    text-align: right;
  }
}

@media (min-width: 68rem) {
  .hero {
    grid-template-columns: minmax(28rem, 0.9fr) minmax(31rem, 0.78fr);
    gap: clamp(3rem, 5vw, 5.5rem);
    align-items: center;
    min-height: 50rem;
    padding-block: clamp(4.5rem, 7vw, 7rem);
  }

  .hero__artifact {
    max-width: 34rem;
  }
}

@media (min-width: 64rem) {
  .proof-section,
  .inside-section,
  .method-section,
  .ai-section,
  .licence-section,
  .purchase-section,
  .faq-section {
    padding-block: 7.5rem;
  }

  .deliverable-ledger li {
    grid-template-columns: 3rem minmax(0, 1fr) 4rem;
    gap: 1.5rem;
    align-items: center;
    padding: 1.5rem 0;
  }
}

@media (pointer: coarse) {
  .button,
  .primary-nav a,
  .faq-list summary {
    min-height: 3.25rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}