:root {
  --ink-0: #090b0c;
  --ink-1: #111516;
  --ink-2: #171d1f;
  --ink-3: #223033;
  --paper-0: #f4e7d6;
  --paper-1: #dbc9b3;
  --paper-2: #bea886;
  --teal-0: #b5f1e3;
  --teal-1: #6fd2bc;
  --teal-2: #2d7567;
  --ember-0: #f6b094;
  --ember-1: #eb7a59;
  --line-soft: rgba(244, 231, 214, 0.16);
  --line-hard: rgba(244, 231, 214, 0.34);
  --shadow-deep: 0 24px 80px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 18px 42px rgba(0, 0, 0, 0.28);
  --radius-large: 28px;
  --radius-medium: 18px;
  --radius-small: 12px;
  --copy-max: 74rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--paper-0);
  font-family: "Avenir Next", Avenir, "Trebuchet MS", system-ui, sans-serif;
  background:
    radial-gradient(circle at 15% 0%, rgba(111, 210, 188, 0.16), transparent 28%),
    radial-gradient(circle at 88% 10%, rgba(235, 122, 89, 0.16), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0, rgba(255, 255, 255, 0) 40%),
    linear-gradient(180deg, #060708 0%, #0d1112 38%, #111718 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(244, 231, 214, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 231, 214, 0.04) 1px, transparent 1px);
  background-size: 100% 2.4rem, 2.4rem 100%;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0.85));
}

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

a {
  color: inherit;
}

.skip-thread {
  position: absolute;
  left: 1rem;
  top: -4rem;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--paper-0);
  color: var(--ink-0);
  text-decoration: none;
  z-index: 100;
}

.skip-thread:focus {
  top: 1rem;
}

.trace-bar {
  width: min(calc(100% - 2rem), var(--copy-max));
  margin: 0 auto;
  padding: 1.4rem 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.trace-back,
.trace-title {
  color: var(--paper-1);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.trace-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: flex-end;
}

.trace-back {
  text-decoration: none;
  padding-bottom: 0.18rem;
  border-bottom: 1px solid rgba(244, 231, 214, 0.2);
}

.trace-back:hover,
.trace-back:focus-visible {
  border-color: var(--teal-1);
  color: var(--teal-0);
}

.manual-shell {
  width: min(calc(100% - 2rem), var(--copy-max));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.signal-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: stretch;
  min-height: 38rem;
}

.hero-copy,
.contact-board,
.manual-block,
.cta-shell {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-large);
  background: linear-gradient(180deg, rgba(22, 28, 29, 0.92), rgba(13, 17, 18, 0.98));
  box-shadow: var(--shadow-deep);
}

.hero-copy {
  padding: 3rem;
  position: relative;
  overflow: hidden;
}

.hero-copy::after {
  content: "";
  position: absolute;
  inset: auto -10% -25% 30%;
  height: 16rem;
  background: radial-gradient(circle, rgba(111, 210, 188, 0.12), transparent 68%);
  pointer-events: none;
}

.section-kicker {
  margin: 0 0 1rem;
  color: var(--paper-1);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  line-height: 1.03;
  margin: 0;
}

h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 6vw, 5.6rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(2rem, 3.5vw, 3.2rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

p,
li,
dd {
  line-height: 1.65;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.hero-subhead {
  max-width: 42rem;
  margin: 1.35rem 0 0;
  color: rgba(244, 231, 214, 0.84);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.stub-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  font-size: 0.8rem;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.stub-button--primary {
  background: linear-gradient(135deg, var(--teal-1), var(--ember-1));
  color: var(--ink-0);
}

.stub-button--quiet {
  background: rgba(255, 255, 255, 0.02);
  color: var(--paper-0);
  border-color: var(--line-hard);
}

.stub-button:hover,
.stub-button:focus-visible {
  transform: translateY(-2px);
}

.stub-button:focus-visible,
.trace-back:focus-visible,
details summary:focus-visible {
  outline: 2px solid var(--teal-1);
  outline-offset: 3px;
}

.field-strip {
  margin: 2.4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.field-strip div {
  padding: 1rem 1.05rem;
  border-radius: var(--radius-medium);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
}

.field-strip dt {
  margin: 0 0 0.35rem;
  color: var(--paper-1);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.field-strip dd {
  margin: 0;
  font-size: 1rem;
}

.contact-board {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem;
  background:
    linear-gradient(180deg, rgba(23, 29, 31, 0.96), rgba(14, 18, 19, 1)),
    radial-gradient(circle at top, rgba(111, 210, 188, 0.08), transparent 40%);
}

.board-label,
.board-caption,
.block-heading p,
.proof-ledger p,
.availability-note p,
.faq-stack p,
.visual-frame figcaption {
  color: rgba(244, 231, 214, 0.78);
}

.board-label {
  margin: 0 0 0.8rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.board-image {
  border-radius: calc(var(--radius-large) - 8px);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-card);
}

.board-caption {
  margin: 0.85rem 0 0;
  font-size: 0.92rem;
}

.manual-block {
  margin-top: 1.6rem;
  padding: 2.2rem;
}

.block-heading {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1.6rem;
}

.block-heading .section-kicker {
  margin: 0;
}

.intent-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 0.9fr;
  gap: 1rem;
}

.intent-note,
.friction-ledger,
.signal-card,
.ledger-row,
.visual-frame,
.use-case-band article {
  padding: 1.3rem;
  border-radius: var(--radius-medium);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
  box-shadow: var(--shadow-card);
}

.friction-ledger ul {
  margin: 0.9rem 0 0;
  padding-left: 1.1rem;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.signal-card p,
.intent-note p,
.friction-ledger li,
.sequence-lane p,
.use-case-band p,
.ledger-row p,
.cta-shell p {
  margin: 0.75rem 0 0;
}

.sequence-lane {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.sequence-lane li {
  position: relative;
  padding: 1.3rem 1.1rem 1.25rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-medium);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015));
  box-shadow: var(--shadow-card);
}

.sequence-lane li::before {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: 0.8rem;
  height: 0.2rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--teal-1), var(--ember-1));
}

.use-case-band {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.visual-pair {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1rem;
}

.visual-frame img {
  border-radius: 14px;
  border: 1px solid var(--line-soft);
}

.visual-frame figcaption {
  margin-top: 0.85rem;
  font-size: 0.92rem;
}

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

.availability-note {
  margin-top: 1rem;
  padding: 1rem 1.1rem 0;
  border-top: 1px solid var(--line-soft);
}

.faq-stack {
  display: grid;
  gap: 0.8rem;
}

details {
  padding: 0;
  border-radius: var(--radius-medium);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.025);
  overflow: hidden;
}

details[open] {
  background: rgba(255, 255, 255, 0.04);
}

details summary {
  cursor: pointer;
  list-style: none;
  padding: 1.1rem 1.2rem;
  font-weight: 700;
}

details summary::-webkit-details-marker {
  display: none;
}

details p {
  margin: 0;
  padding: 0 1.2rem 1.2rem;
}

.manual-block--cta {
  background: transparent;
  box-shadow: none;
  border: 0;
  padding: 0;
}

.cta-shell {
  padding: 2.4rem;
  text-align: left;
  background:
    radial-gradient(circle at 20% 20%, rgba(111, 210, 188, 0.1), transparent 30%),
    linear-gradient(180deg, rgba(25, 31, 32, 0.94), rgba(11, 14, 15, 0.98));
}

@media (max-width: 1120px) {
  .signal-hero,
  .visual-pair,
  .intent-layout,
  .sequence-lane,
  .use-case-band,
  .signal-grid,
  .proof-ledger,
  .block-heading {
    grid-template-columns: 1fr;
  }

  .field-strip {
    grid-template-columns: 1fr;
  }

  .signal-hero {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .manual-shell,
  .trace-bar {
    width: min(calc(100% - 1rem), var(--copy-max));
  }

  .hero-copy,
  .manual-block,
  .cta-shell,
  .contact-board {
    padding: 1.3rem;
  }

  h1 {
    max-width: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .stub-button {
    width: 100%;
  }

  .trace-bar {
    padding-top: 0.9rem;
    align-items: flex-start;
    flex-direction: column;
  }

  .trace-links {
    width: 100%;
    justify-content: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}