.ai-hero {
  position: relative;
  padding-top: clamp(54px, 7vw, 94px);
  padding-bottom: clamp(64px, 9vw, 118px);
  overflow-x: clip;
}

.ai-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--color-line-soft) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-line-soft) 1px, var(--color-transparent) 1px),
    radial-gradient(circle at 78% 42%, var(--color-brand-glow), var(--color-transparent) 38%);
  background-size: 48px 48px, 48px 48px, auto;
  -webkit-mask-image: linear-gradient(to bottom, var(--color-black), var(--color-transparent));
  mask-image: linear-gradient(to bottom, var(--color-black), var(--color-transparent));
  pointer-events: none;
}

.ai-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr);
  gap: clamp(38px, 7vw, 88px);
  align-items: center;
}

.ai-hero-copy,
.ai-ledger {
  min-width: 0;
}

.ai-hero-copy h1 {
  max-width: 760px;
}

.ai-hero-lead {
  max-width: 690px;
  margin-bottom: 20px;
  color: var(--color-ink-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

.ai-hero-lead strong {
  color: var(--color-ink);
  font-weight: 650;
}

.ai-signup-note {
  margin-bottom: 0;
  color: var(--color-brand-strong);
  font-size: 13px;
  font-weight: 650;
}

.ai-ledger {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transform: rotate(1deg);
  transition: transform var(--transition-fast);
}

.ai-ledger:hover {
  transform: rotate(1deg) translateY(-2px);
}

.ai-ledger::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 116px;
  height: 116px;
  background: var(--color-brand-mist);
  border: 1px solid var(--color-brand-border);
  border-radius: 50%;
  box-shadow: 0 0 0 18px var(--color-brand-mist);
  pointer-events: none;
}

.ai-ledger-chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: var(--color-surface-warm);
  border-bottom: 1px solid var(--color-line);
}

.ai-ledger-title {
  margin-left: 8px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.ai-ledger-body {
  position: relative;
  z-index: 1;
  padding: clamp(20px, 4vw, 32px);
}

.ai-ledger-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 15px;
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 700;
}

.ai-ledger-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}

.ai-ledger-row:last-of-type {
  border-bottom: 0;
}

.ai-ledger-mark {
  width: 11px;
  height: 11px;
  background: var(--color-brand);
  border: 3px solid var(--color-brand-soft);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--color-brand-border-strong);
}

.ai-ledger-row strong,
.ai-ledger-row small {
  display: block;
}

.ai-ledger-row strong {
  margin-bottom: 2px;
  font-size: 14px;
}

.ai-ledger-row small {
  color: var(--color-ink-muted);
  font-size: 12px;
  line-height: 1.55;
}

.ai-ledger-state {
  color: var(--color-brand-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.ai-ledger-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
  padding-top: 15px;
  color: var(--color-ink-muted);
  border-top: 1px dashed var(--color-line);
  font-size: 11px;
}

.ai-ledger-foot .mono {
  color: var(--color-brand);
  font-weight: 750;
}

.ai-article {
  position: relative;
}

.ai-article .toc-tabs {
  margin-bottom: clamp(40px, 6vw, 72px);
}

.ai-section {
  padding-top: clamp(58px, 8vw, 104px);
  padding-bottom: clamp(58px, 8vw, 104px);
  border-bottom: 1px solid var(--color-line);
}

.ai-section:last-child {
  border-bottom: 0;
}

.ai-section-label {
  display: block;
  margin-bottom: 11px;
  color: var(--color-brand);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .12em;
}

.ai-prose {
  max-width: 850px;
  color: var(--color-ink-muted);
  font-size: 17px;
}

.ai-prose p {
  margin-bottom: 1.35em;
}

.ai-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 38px;
}

.ai-principle {
  min-width: 0;
  padding: 25px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
}

.ai-principle-index {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--color-brand);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .1em;
}

.ai-principle h3 {
  font-size: 20px;
}

.ai-principle p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.ai-tool-table td:first-child {
  color: var(--color-brand-strong);
  font-family: var(--font-display);
}

.ai-tool-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-tool-note {
  min-width: 0;
  padding: clamp(23px, 4vw, 34px);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
}

.ai-tool-name {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 15px;
}

.ai-tool-name h3 {
  margin-bottom: 0;
  font-size: 22px;
}

.ai-tool-dot {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  background: var(--color-brand);
  border: 3px solid var(--color-brand-soft);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--color-brand-border-strong);
}

.ai-tool-note p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

.ai-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.ai-split-panel {
  box-shadow: var(--shadow-soft);
}

.ai-split-panel:nth-child(2) {
  background: var(--color-brand-mist);
  border-color: var(--color-brand-border-strong);
}

.ai-panel-kicker {
  display: inline-flex;
  margin-bottom: 20px;
  padding: 5px 11px;
  color: var(--color-brand-strong);
  background: var(--color-brand-soft);
  border: 1px solid var(--color-brand-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.ai-split-panel p,
.ai-split-panel li {
  color: var(--color-ink-muted);
}

.ai-split-panel ul {
  margin-bottom: 0;
}

.ai-split-panel li {
  margin-bottom: 7px;
}

.ai-workflow {
  display: grid;
  gap: 15px;
}

.ai-workflow-item {
  display: grid;
  grid-template-columns: minmax(150px, .45fr) minmax(0, 1.55fr);
  gap: 28px;
  align-items: start;
  padding: clamp(22px, 4vw, 34px);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
}

.ai-workflow-head {
  min-width: 0;
}

.ai-workflow-head h3 {
  margin-bottom: 0;
  font-size: 21px;
}

.ai-workflow-symbol {
  display: block;
  margin-bottom: 10px;
  color: var(--color-brand);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .1em;
}

.ai-workflow-item p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

.ai-selection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-selection-card {
  box-shadow: var(--shadow-soft);
}

.ai-selection-tag {
  display: inline-flex;
  margin-bottom: 22px;
  padding: 5px 11px;
  color: var(--color-brand-strong);
  background: var(--color-brand-soft);
  border: 1px solid var(--color-brand-border);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
}

.ai-selection-card h3 {
  font-size: 21px;
}

.ai-selection-card p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

.ai-service-panel {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(210px, .6fr);
  gap: clamp(28px, 6vw, 70px);
  align-items: center;
  padding: clamp(28px, 5vw, 52px);
  color: var(--color-surface-warm);
  background: var(--color-ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.ai-service-copy {
  min-width: 0;
}

.ai-service-copy h3 {
  margin-top: 18px;
  color: var(--color-white);
  font-size: clamp(27px, 4vw, 40px);
}

.ai-service-copy p {
  color: var(--color-line);
}

.ai-service-copy p:last-child {
  margin-bottom: 0;
}

.ai-service-copy a {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: .2em;
}

.ai-service-actions {
  display: grid;
  gap: 11px;
}

.ai-service-actions .btn {
  width: 100%;
}

.ai-service-actions .btn-secondary {
  color: var(--color-white);
  background: var(--color-transparent);
  border-color: var(--color-ink-muted);
}

.ai-service-actions .btn-secondary:hover {
  background: var(--color-ink-muted);
  border-color: var(--color-line);
}

.ai-service-actions .btn-quiet {
  color: var(--color-brand-strong);
  background: var(--color-brand-soft);
}

@media (max-width: 1000px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

  .ai-ledger {
    width: 100%;
    max-width: 660px;
    transform: none;
  }

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

  .ai-principles {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 42px;
    padding-bottom: 66px;
  }

  .ai-hero::before {
    background-size: 34px 34px, 34px 34px, auto;
  }

  .ai-tool-notes,
  .ai-split,
  .ai-selection-grid,
  .ai-service-panel {
    grid-template-columns: 1fr;
  }

  .ai-workflow-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .ai-section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .ai-service-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ai-service-actions .btn-quiet {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .ai-hero-grid {
    gap: 34px;
  }

  .ai-ledger-body {
    padding: 18px;
  }

  .ai-ledger-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .ai-ledger-state {
    grid-column: 2;
  }

  .ai-ledger-foot {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-tool-notes {
    gap: 14px;
  }

  .ai-tool-note {
    padding: 21px;
  }

  .ai-service-actions {
    grid-template-columns: 1fr;
  }

  .ai-service-actions .btn-quiet {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-ledger,
  .ai-ledger:hover {
    transform: none;
  }
}