:root {
  --ground: #FBFAF6;
  --card: #F4F1E9;
  --ink: #1A1613;
  --muted: #55504A;
  --soft: #6B6761;
  --accent: #1D6F5C;
  --close-lead: #C9C4BA;
  --close-meta: #9AC7B8;
  --line: rgba(26, 22, 19, 0.12);
  --line-strong: rgba(26, 22, 19, 0.2);
  --nav-h: 73px;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; overflow-x: hidden; }
body { margin: 0; max-width: 100%; overflow-x: hidden; }
* { box-sizing: border-box; }
::selection { background: var(--accent); color: var(--ground); }

a { color: var(--ink); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: 12px;
  top: -56px;
  z-index: 100;
  background: var(--ink);
  color: var(--ground);
  padding: 10px 14px;
  text-decoration: none;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 14px;
}
.skip-link:focus { top: 12px; }

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

.page {
  background: var(--ground);
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 246, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px 32px;
}
.brand {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-height: 44px;
  justify-content: center;
}
.brand:hover { color: var(--ink); }
.wordmark {
  font-family: "IBM Plex Mono", monospace;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
}
.tagline {
  font-family: "Newsreader", serif;
  font-style: italic;
  font-weight: 300;
  font-size: 14px;
  color: var(--muted);
}
.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 18px;
  font-size: 14px;
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 0;
  text-decoration: none;
  color: var(--muted);
}
.nav-links a[aria-current="page"] {
  color: var(--ink);
}
.nav-links .btn {
  padding: 10px 18px;
  min-height: 0;
  border: 0;
  border-radius: 0;
  background: var(--ink);
  color: var(--ground);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
  white-space: nowrap;
}
.nav-links .btn:hover {
  background: var(--accent);
  color: var(--ground);
}

.nav-toggle {
  display: none;
  appearance: none;
  background: none;
  border: 0;
  padding: 10px;
  margin: -6px -10px -6px 0;
  color: var(--ink);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}
.nav-toggle-icon {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
}
.nav-toggle-close { display: none; }
.nav.is-open .nav-toggle-open { display: none; }
.nav.is-open .nav-toggle-close { display: block; }

/* Marks: product and offering tiles (assets/marks/) */
.mark {
  display: block;
  width: 40px;
  height: 40px;
  flex: none;
}
.mark-row {
  display: inline-flex;
  gap: 3px;
  flex: none;
}

/* Nav hover menus (desktop only; on phones the top-level link is enough) */
.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav-menu { display: none; }
.nav-links .nav-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 0;
  padding: 8px;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.35;
}
.nav-links .nav-menu-item:hover { background: var(--card); color: var(--ink); }
.nav-menu-rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 6px 8px;
}
.nav-menu-doors {
  display: flex;
  align-items: flex-start;
  gap: 4px;
  width: 260px;
}
.nav-links .nav-menu-doors .nav-menu-item {
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  font-family: "Newsreader", serif;
  font-size: 17px;
}
.nav-menu-arrow {
  margin-top: 18px;
  color: var(--soft);
}
@media (min-width: 900px) {
  .nav-item.has-menu .nav-menu {
    position: absolute;
    top: 100%;
    right: -18px;
    min-width: 280px;
    padding: 10px;
    background: var(--ground);
    border: 1px solid var(--line);
  }
  .nav-item.has-menu:hover .nav-menu,
  .nav-item.has-menu:focus-within .nav-menu { display: block; }
}

/* Offering doors (ai.html) */
.doors {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  max-width: 720px;
  margin-top: 48px;
}
.door {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}
.door .mark { width: 64px; height: 64px; }
.door h3 { margin: 4px 0 0; }
.door .body { margin: 0; }
.doors-arrow {
  margin-top: 20px;
  font-size: 28px;
  color: var(--soft);
}

/* Product rows (products.html, ai.html, index.html) */
.product-list {
  display: flex;
  flex-direction: column;
  margin-top: 40px;
  border-top: 1px solid var(--line);
}
.product-row {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}
.product-row .mark,
.product-row .mark-row .mark { width: 64px; height: 64px; }
.product-row h3 { margin: 0; }
.product-row .body { margin-top: 8px; }
.mark-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.mark-links a {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
}
.mark-links a:hover { color: var(--accent); }
.mark-links .mark { width: 72px; height: 72px; }

/* The work we do (index.html) */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 48px;
}
.work-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  padding: 28px 24px;
  background: var(--ground);
  color: var(--ink);
  text-decoration: none;
}
.work-col-link {
  display: flex;
  flex-direction: column;
  gap: 14px;
  color: inherit;
  text-decoration: none;
}
a.work-col:hover h3,
.work-col-link:hover h3 { color: var(--accent); }
.work-col h3 { margin: 4px 0 0; }
.work-col .body { margin: 0; }
.work-col .mark { width: 56px; height: 56px; }
.work-col .mark-row { align-items: center; gap: 6px; }
.work-arrow { color: var(--soft); padding: 0 4px; }
.work-examples {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
  text-decoration: none;
}
.work-examples:hover { color: var(--accent); }
.work-col .mark.mark-sm { width: 40px; height: 40px; }

@media (max-width: 899px) {
  .doors { flex-direction: column; gap: 12px; }
  .doors-arrow { margin: 0; transform: rotate(90deg); }
  .product-row { gap: 18px; }
  .work-grid { grid-template-columns: minmax(0, 1fr); gap: 12px; margin-top: 32px; }
  .work-col { padding: 24px 20px; }
  .product-row .mark,
  .product-row .mark-row .mark { width: 48px; height: 48px; }
}

.main {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.card {
  background: var(--ground);
  border: 0;
  border-radius: 0;
  padding: 64px 0;
  min-width: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.card.on-card { background: var(--card); }
.card-inner {
  max-width: 1120px;
  width: 100%;
  min-width: 0;
  margin: 0 auto;
  padding: 0 20px;
}
.fold {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
}
.fold-scroll {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  z-index: 1;
  transition: opacity 280ms ease, color 200ms ease;
}
.fold-scroll:hover { color: var(--accent); }
.fold-scroll.is-away {
  opacity: 0;
  pointer-events: none;
}
.fold-scroll-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.fold-scroll-mark {
  display: block;
  animation: fold-scroll-nudge 1.8s ease-in-out infinite;
}
@keyframes fold-scroll-nudge {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(5px); opacity: 1; }
}

.top-scroll {
  position: fixed;
  left: auto;
  right: max(20px, env(safe-area-inset-right));
  bottom: max(28px, env(safe-area-inset-bottom));
  transform: none;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  cursor: pointer;
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms ease, color 200ms ease;
}
.top-scroll:hover { color: var(--accent); }
.top-scroll.is-visible {
  opacity: 1;
  pointer-events: auto;
}
.top-scroll.is-on-ink { color: var(--close-lead); }
.top-scroll.is-on-ink:hover { color: #fff; }
.top-scroll-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.top-scroll-mark {
  display: block;
  animation: top-scroll-nudge 1.8s ease-in-out infinite;
}
@keyframes top-scroll-nudge {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(-5px); opacity: 1; }
}

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}
h1, h2, h3 {
  font-family: "Newsreader", serif;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: 0;
}
h1, h2, .lead, .body { min-width: 0; }
h1 {
  font-size: clamp(56px, 8.5vw, 112px);
  line-height: 0.98;
  max-width: 12ch;
  overflow-wrap: break-word;
}
h2 {
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.04;
  max-width: 14ch;
}
h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.2;
}
.lead {
  font-size: 22px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 34em;
  margin: 18px 0 0;
}
.body {
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.65;
  color: var(--muted);
  max-width: 38em;
  margin: 16px 0 0;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  min-width: 0;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 26px;
  border: 0;
  border-radius: 0;
  text-decoration: none;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 16px;
  font-weight: 500;
  background: var(--ink);
  color: var(--ground);
  cursor: pointer;
  appearance: none;
}
.btn-primary:hover { background: var(--accent); color: var(--ground); }

.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.split-copy,
.split-mark { min-width: 0; }
.split-mark {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.context-rows {
  display: flex;
  flex-direction: column;
  width: 100%;
}
.split-copy .context-rows {
  margin-top: 28px;
}
.context-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px;
  border: 1px solid var(--ground);
  background: var(--card);
}
.on-card .context-row { background: var(--ground); }
.context-verb,
.context-gloss {
  font-family: "Newsreader", serif;
  margin: 0;
}
.context-verb {
  font-size: 30px;
  font-weight: 400;
  font-style: normal;
  line-height: 1.2;
  color: var(--ink);
}
.context-gloss {
  font-size: 22px;
  font-weight: 300;
  font-style: italic;
  line-height: 1.2;
  color: var(--accent);
  text-align: right;
}

.horizon-wrap {
  position: relative;
  margin-top: 40px;
  width: 100%;
}
.horizon {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}
.horizon-legend {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 32px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0;
  transition: opacity 300ms ease;
}
.horizon-legend.is-on { opacity: 1; }
.horizon-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.horizon-legend svg { display: block; flex: 0 0 auto; }
.horizon-risk {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
  opacity: 0;
  transition: opacity 200ms ease;
}
.horizon-risk.is-on { opacity: 1; }
.horizon-finish {
  stroke: var(--ink);
  opacity: 0.4;
  transition: stroke 300ms ease, opacity 300ms ease;
}
.horizon-finish.is-on {
  stroke: var(--accent);
  opacity: 1;
}
.horizon-solved {
  position: absolute;
  left: 98.214%;
  top: 36.364%;
  margin: 0;
  padding-left: 10px;
  transform: translateY(-50%);
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  transition: opacity 300ms ease;
}
.horizon-solved.is-on { opacity: 1; }

.horizon-motion {
  appearance: none;
  margin: 16px 0 0;
  padding: 0;
  border: 0;
  background: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.horizon-motion:hover { color: var(--accent); }
.horizon-motion[hidden] { display: none !important; }

.num {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 12px;
}

#close {
  background: var(--ink);
}
#close h1,
#close h2 { color: var(--ground); }
#close .lead { color: var(--close-lead); }
#close .btn-primary {
  background: var(--accent);
  color: #fff;
}
#close .btn-primary:hover {
  background: #155a4a;
  color: #fff;
}
#close .btn-primary:disabled {
  opacity: 0.55;
  cursor: wait;
}

.close-form {
  position: relative;
  margin-top: 28px;
  max-width: 34em;
}
.close-field {
  margin: 0 0 20px;
}
.close-field label {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--close-meta);
  margin: 0 0 8px;
}
#close .close-form input,
#close .close-form textarea,
.close-field input,
.close-field textarea {
  box-sizing: border-box;
  display: block;
  width: 100%;
  max-width: 100%;
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(201, 196, 186, 0.45);
  border-radius: 0;
  color: var(--ground);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  padding: 10px 0;
}
.close-field textarea {
  min-height: 8rem;
  resize: vertical;
}
.close-field input:focus,
.close-field textarea:focus {
  outline: none;
  border-bottom-color: var(--accent);
}
.close-honey {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}
.close-error {
  margin: 0 0 16px;
  color: var(--close-meta);
  font-size: 15px;
}
.close-sent {
  margin: 28px 0 0;
  font-family: "Newsreader", serif;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.3;
  color: var(--close-lead);
}
.close-form .actions { margin-top: 8px; }

.close-book {
  margin: 18px 0 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  color: var(--close-meta);
}
.close-book a {
  color: var(--close-meta);
  text-decoration: none;
  white-space: nowrap;
}
.close-book a:hover { color: var(--ground); }

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(36px, 4vw, 52px) clamp(20px, 4vw, 48px);
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  gap: 32px;
  justify-content: space-between;
}
.footer-brand {
  max-width: 22em;
  min-width: 0;
}
.footer-brand .wordmark { margin-bottom: 10px; }
.footer-brand .tagline { margin: 0; }
.footer a {
  color: var(--muted);
  text-decoration: none;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}
.footer a:hover { color: var(--accent); }
.footer-nav {
  display: flex;
  gap: clamp(32px, 5vw, 64px);
  flex-wrap: nowrap;
  flex: 0 0 auto;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}
.footer-col a { white-space: nowrap; }
.footer-note {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--muted);
}
.legal {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px clamp(20px, 4vw, 48px) 28px;
  border-top: 1px solid var(--line);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--soft);
}

@media (min-width: 900px) {
  .card {
    padding: 96px 0;
    min-height: 70vh;
  }
  .fold { min-height: calc(100vh - var(--nav-h)); }
  .card-inner { padding: 0 24px; }
  .split {
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
  }
  .split-mark { align-items: center; }
}

@media (min-width: 1168px) {
  .card-inner { padding: 0; }
}

@media (max-width: 899px) {
  .nav-inner {
    flex-wrap: wrap;
    padding-top: 12px;
    padding-bottom: 10px;
  }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 0 6px;
    border-top: 1px solid var(--line);
    font-size: 14px;
  }
  .nav.is-open .nav-links { display: flex; }
  .nav-links a { align-self: flex-start; }
  .nav-links .btn { margin-top: 10px; width: auto; }
  .footer-inner {
    flex-direction: column;
    gap: 28px;
  }
  .footer-nav {
    width: 100%;
    justify-content: space-between;
  }
  .fold { min-height: auto; }
  .fold > * { min-width: 0; max-width: 100%; }
  .fold-scroll {
    position: static;
    transform: none;
    margin: 28px auto 0;
  }
  .card { min-height: auto; }
  .split-mark { width: 60%; }
  .split-mark.context-stack { width: 100%; }
  .horizon-legend { flex-wrap: wrap; }
  .context-verb { font-size: 26px; }
  .context-gloss { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body,
  .page,
  .card,
  a,
  button {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .horizon-legend {
    opacity: 1;
    transition: none;
  }
  .horizon-risk {
    opacity: 1;
    transition: none;
  }
  .horizon-finish {
    stroke: var(--accent);
    opacity: 1;
    transition: none;
  }
  .horizon-solved {
    opacity: 1;
    transition: none;
  }
  .fold-scroll-mark,
  .top-scroll-mark {
    animation: none;
    opacity: 1;
  }
}

.product-row .body a {
  color: var(--ink);
  text-decoration-color: var(--line-strong);
}
.product-row .body a:hover { color: var(--accent); }