.ai-hero {
  display: flex;
  min-height: calc(100svh - var(--header-height));
  align-items: center;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
}

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(360px, 0.96fr);
  gap: clamp(48px, 7vw, 104px);
  align-items: center;
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(64px, 8vw, 112px);
}

.ai-hero-copy h1 {
  max-width: 720px;
  margin-top: 24px;
}

.ai-hero-lead {
  max-width: 650px;
  margin-top: 26px;
  color: var(--color-muted);
  font-size: 17px;
  line-height: 1.85;
}

.ai-hero-copy .button-row {
  margin-top: 32px;
}

.ai-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 24px;
  color: var(--color-muted);
  font-size: 13px;
}

.ai-trust span {
  position: relative;
  padding-left: 13px;
}

.ai-trust span::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  content: "";
}

.ai-flow-board {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.ai-flow-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 11px;
  letter-spacing: 0.07em;
}

.ai-flow-canvas {
  position: relative;
  min-height: 300px;
  margin-top: 18px;
}

.ai-flow-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.ai-flow-lines path,
.ai-flow-lines circle {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1.2;
}

.ai-flow-lines path {
  stroke-dasharray: 5 6;
}

.ai-flow-source,
.ai-flow-target {
  position: absolute;
  top: 20px;
  bottom: 20px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ai-flow-source {
  left: 0;
}

.ai-flow-target {
  right: 0;
}

.ai-flow-source span,
.ai-flow-target span,
.ai-flow-core {
  display: inline-flex;
  min-width: 58px;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-flow-core {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  min-width: 62px;
  min-height: 62px;
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translate(-50%, -50%);
}

.ai-flow-board > p {
  margin: 12px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.ai-article {
  overflow-x: clip;
}

.ai-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(44px, 7vw, 112px);
  align-items: start;
}

.ai-section-label {
  position: sticky;
  top: calc(var(--header-height) + 28px);
}

.ai-section-label > span,
.ai-wide-head .mono,
.ai-choice .mono {
  display: block;
  margin-bottom: 18px;
  color: var(--color-muted);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.ai-section-label h2 {
  max-width: 400px;
}

.ai-copy {
  max-width: var(--reading-max);
}

.ai-copy > p {
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.9;
}

.ai-copy h3 {
  font-size: 24px;
}

.ai-panel-section {
  background: var(--color-panel);
}

.ai-wide-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.7fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 48px;
}

.ai-wide-head p {
  margin: 0;
  color: var(--color-muted);
}

.ai-tool-list {
  border-top: 1px solid var(--color-border);
}

.ai-tool-item {
  display: grid;
  grid-template-columns: minmax(190px, 0.48fr) minmax(0, 1.52fr);
  gap: 36px;
  padding: 34px 0;
  border-bottom: 1px solid var(--color-border);
}

.ai-tool-name span {
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.ai-tool-name h3 {
  margin-top: 10px;
  font-size: 27px;
}

.ai-tool-item p {
  max-width: 800px;
  margin: 0;
  color: var(--color-muted);
  line-height: 1.85;
}

.ai-practice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.ai-practice-grid article {
  min-width: 0;
  padding: clamp(24px, 4vw, 40px);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.ai-practice-grid .mono {
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.ai-practice-grid h3 {
  margin-top: 16px;
  font-size: 25px;
}

.ai-practice-grid p {
  margin: 16px 0 0;
  color: var(--color-muted);
}

.ai-diagnose-list {
  border-top: 1px solid var(--color-border);
}

.ai-diagnose-list article {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.ai-diagnose-list h3 {
  font-size: 22px;
}

.ai-diagnose-list p {
  margin: 12px 0 0;
  color: var(--color-muted);
  line-height: 1.85;
}

.ai-choice-section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  background: var(--color-accent);
  color: var(--color-bg);
}

.ai-choice {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(48px, 8vw, 120px);
}

.ai-choice h2 {
  color: var(--color-bg);
}

.ai-choice .mono {
  color: var(--color-border);
}

.ai-choice-copy p {
  color: var(--color-border);
  line-height: 1.9;
}

.ai-choice-copy .button-row {
  margin-top: 32px;
}

.ai-choice-copy .btn {
  border-color: var(--color-bg);
  background: var(--color-bg);
  color: var(--color-text);
}

.ai-choice-copy .btn:hover {
  background: var(--color-panel);
}

.ai-choice-copy .btn-primary {
  border-color: var(--color-bg);
  background: var(--color-transparent);
  color: var(--color-bg);
}

.ai-choice-copy .btn-primary:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

@media (max-width: 1050px) {
  .ai-hero {
    min-height: auto;
  }

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

  .ai-flow-board {
    max-width: 720px;
  }

  .ai-layout {
    grid-template-columns: minmax(190px, 0.55fr) minmax(0, 1.45fr);
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .ai-hero-grid {
    gap: 48px;
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .ai-hero-lead {
    font-size: 15px;
  }

  .ai-flow-canvas {
    min-height: 250px;
  }

  .ai-layout,
  .ai-wide-head,
  .ai-choice {
    grid-template-columns: 1fr;
  }

  .ai-section-label {
    position: static;
  }

  .ai-tool-item {
    grid-template-columns: 1fr;
    gap: 18px;
  }

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

  .ai-wide-head {
    gap: 22px;
  }
}

@media (max-width: 520px) {
  .ai-flow-board {
    padding: 16px;
  }

  .ai-flow-canvas {
    min-height: 220px;
  }

  .ai-flow-lines {
    opacity: 0.55;
  }

  .ai-flow-source span,
  .ai-flow-target span {
    min-width: 48px;
    min-height: 30px;
    font-size: 9px;
  }

  .ai-flow-core {
    min-width: 54px;
    min-height: 54px;
  }

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

  .ai-tool-item {
    padding: 28px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-flow-lines {
    animation: none;
  }
}