.ai-hero {
  padding-top: 58px;
  padding-bottom: 68px;
}

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  align-items: center;
  gap: 70px;
}

.ai-visual {
  min-width: 0;
}

.ai-hero-copy {
  position: relative;
  z-index: 2;
}

.ai-hero-copy h1 {
  max-width: 620px;
  margin: 20px 0 28px;
}

.ai-hero-copy .lede {
  max-width: 610px;
  margin: 24px 0 0;
}

.ai-signup-note {
  margin: 16px 0 0;
}

.ai-plot-grid path {
  fill: none;
  stroke: var(--color-lavender);
  stroke-width: 1;
  opacity: .08;
}

.ai-axis {
  fill: none;
  stroke: var(--color-lavender);
  stroke-width: 1;
  opacity: .16;
}

.ai-curve-glow {
  fill: none;
  stroke: var(--color-lavender);
  stroke-width: 10;
  stroke-linecap: round;
  opacity: .2;
}

.ai-curve {
  fill: none;
  stroke: url("#aiCurve");
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-chord {
  fill: none;
  stroke: var(--color-lavender);
  stroke-width: 1;
  stroke-dasharray: 5 5;
  opacity: .72;
}

.ai-point {
  fill: var(--color-lavender-light);
}

.ai-point-ring {
  fill: none;
  stroke: var(--color-lavender-light);
  stroke-width: 1.5;
  opacity: .55;
}

.ai-svg-label {
  fill: var(--color-lavender);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-svg-note {
  fill: var(--color-lavender-mid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.ai-article {
  position: relative;
}

.ai-section-tinted {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel-deep);
}

.ai-section-dark {
  color: var(--color-lavender);
  background: var(--color-ink);
}

.ai-section-head {
  max-width: 850px;
  margin-bottom: 34px;
}

.ai-section-head h2 {
  margin-bottom: 16px;
}

.ai-section-head .lede {
  margin-bottom: 0;
}

.ai-section-code {
  margin-bottom: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.ai-section-head-light h2 {
  color: var(--color-lavender-light);
}

.ai-section-head-light .lede {
  color: var(--color-lavender);
}

.ai-section-dark .ai-section-code {
  color: var(--color-lavender-mid);
}

.ai-principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.ai-principle {
  min-width: 0;
  padding: 26px;
}

.ai-principle + .ai-principle {
  border-left: 1px solid var(--color-border);
}

.ai-principle h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.ai-principle p:last-child {
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-principle-key {
  margin-bottom: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

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

.ai-tool-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-border);
  box-shadow: var(--shadow-card);
}

.ai-tool-notes section {
  min-width: 0;
  padding: 26px;
  background: var(--color-panel);
}

.ai-tool-notes h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

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

.ai-dark-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
  align-items: start;
  gap: 56px;
}

.ai-dark-grid h2 {
  color: var(--color-lavender-light);
}

.ai-dark-grid > div:first-child > p:not(.ai-section-code) {
  color: var(--color-lavender);
}

.ai-check-panel {
  box-shadow: none;
}

.ai-check-body {
  display: grid;
  gap: 0;
  padding: 12px 18px 18px;
}

.ai-check-body p {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 13px 0;
  border-bottom: 1px solid var(--color-ink-rule);
  color: var(--color-lavender);
  font-size: 13px;
}

.ai-check-body p:last-child {
  border-bottom: 0;
}

.ai-check-body span {
  color: var(--color-lavender-light);
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.ai-split .card {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.ai-split h3 {
  margin-bottom: 12px;
}

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

.ai-split ul {
  display: grid;
  gap: 8px;
  margin-bottom: 0;
}

.ai-workflow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.ai-workflow section {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.ai-workflow h3 {
  margin-bottom: 12px;
  font-size: 21px;
}

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

.ai-selection-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.ai-selection-grid section {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--color-ink-chip-border);
  border-radius: var(--radius-md);
  background: var(--color-ink-chip);
}

.ai-selection-grid h3 {
  margin-bottom: 10px;
  color: var(--color-lavender-light);
  font-size: 19px;
}

.ai-selection-grid p {
  margin-bottom: 0;
  color: var(--color-lavender);
}

.ai-dark-actions {
  margin-top: 28px;
}

.ai-dark-ghost {
  border-color: var(--color-ink-chip-border);
  color: var(--color-lavender-light);
  background: var(--color-ink-chip);
}

.ai-dark-ghost:hover {
  border-color: var(--color-lavender-mid);
  color: var(--color-text);
  background: var(--color-lavender-light);
}

.ai-plan-layout {
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
  align-items: start;
  gap: 24px 54px;
}

.ai-plan-layout .ai-section-head {
  grid-row: span 2;
  margin-bottom: 0;
}

.ai-plan-facts {
  display: grid;
  gap: 10px;
}

.ai-fact-block {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.ai-fact-block h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.ai-fact-block p {
  margin-bottom: 5px;
}

.ai-fact-block p:last-child {
  margin-bottom: 0;
  font-size: 13px;
}

@media (max-width: 1040px) {
  .ai-hero-grid {
    gap: 40px;
  }

  .ai-dark-grid {
    gap: 32px;
  }

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

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

  .ai-plan-layout .ai-section-head {
    grid-row: auto;
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 34px;
    padding-bottom: 48px;
  }

  .ai-hero-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .ai-hero-copy {
    order: 1;
  }

  .ai-visual {
    order: 2;
  }

  .ai-visual .ec-stage {
    width: 100%;
    margin-left: 0;
  }

  .ai-visual .ec-halo,
  .ai-visual .ec-foot,
  .ai-visual .ai-svg-label,
  .ai-visual .ai-svg-note {
    display: none;
  }

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

  .ai-principle + .ai-principle {
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .ai-dark-grid {
    gap: 28px;
  }
}

@media (max-width: 480px) {
  .ai-principle,
  .ai-tool-notes section,
  .ai-workflow section,
  .ai-selection-grid section,
  .ai-fact-block {
    padding: 19px;
  }

  .ai-check-body {
    padding-inline: 14px;
  }

  .ai-check-body p {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}