.ai-hero {
  position: relative;
  padding-top: clamp(54px, 8vw, 104px);
  padding-bottom: clamp(58px, 8vw, 98px);
  overflow: clip;
}

.ai-hero::before {
  position: absolute;
  top: 8%;
  right: -12%;
  width: min(680px, 72vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-tint), transparent 68%);
  content: "";
  pointer-events: none;
}

.ai-hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 38%;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel-strong);
  content: "";
  pointer-events: none;
}

.ai-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(520px, 1.18fr);
  gap: clamp(34px, 5vw, 72px);
  align-items: center;
}

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

.ai-hero-copy h1 {
  max-width: 650px;
  margin-top: 18px;
}

.ai-hero-lede {
  max-width: 650px;
  margin-bottom: 26px;
  color: var(--color-text-muted);
  font-size: 18px;
}

.ai-fact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.ai-fact-row .fact-pill {
  background: var(--color-panel);
}

.ai-route-window {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-window);
  background: var(--color-paper);
  box-shadow: var(--shadow-window);
}

.ai-window-chrome {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--color-border);
}

.ai-window-label {
  margin-left: auto;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
}

.ai-window-body {
  min-width: 0;
  padding: 18px;
}

.ai-terminal {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  background: var(--color-panel);
}

.ai-terminal-label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
}

.ai-terminal-dot {
  width: 7px;
  height: 7px;
  margin-left: auto;
  border-radius: 50%;
  background: var(--color-success);
  animation: ai-pulse 2.4s ease-in-out infinite;
}

.ai-route-diagram {
  width: 100%;
  height: auto;
  margin-top: 8px;
}

.ai-grid-line {
  fill: none;
  stroke: var(--color-panel-strong);
  stroke-width: 1;
}

.ai-route-path {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 3;
  stroke-dasharray: 9 7;
  stroke-linecap: round;
  animation: ai-route-shift 5s linear infinite;
}

.ai-route-origin {
  fill: var(--color-warning);
}

.ai-route-ring {
  fill: var(--color-accent-tint);
  stroke: var(--color-accent);
  stroke-width: 2;
}

.ai-route-end {
  fill: var(--color-accent);
}

.ai-tool-slot {
  fill: var(--color-panel);
  stroke: var(--color-border);
  stroke-width: 1;
}

.ai-tool-slot-active {
  fill: var(--color-accent-tint);
  stroke: var(--color-accent);
}

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

.ai-svg-label-hot,
.ai-svg-note-hot {
  fill: var(--color-accent-dark);
  font-weight: 700;
}

.ai-window-status {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
}

.ai-window-status span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.ai-window-status i {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-success);
}

.ai-geo {
  position: absolute;
  z-index: 4;
  width: 0;
  height: 0;
}

.ai-geo-pink {
  top: -17px;
  right: 54px;
  border-right: 17px solid transparent;
  border-bottom: 15px solid var(--color-pink);
  transform: rotate(16deg);
}

.ai-geo-amber {
  bottom: -14px;
  left: 38px;
  border-top: 14px solid var(--color-warning);
  border-left: 16px solid transparent;
  transform: rotate(-12deg);
}

.ai-article {
  position: relative;
  padding-top: 34px;
  padding-bottom: var(--section-space);
}

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

.ai-principle-card {
  min-width: 0;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.ai-principle-card:nth-child(2),
.ai-principle-card:nth-child(3) {
  background: var(--color-paper);
}

.ai-principle-card h3 {
  margin-top: 14px;
  font-size: 26px;
}

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

.ai-card-code,
.ai-mode-label {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
}

.ai-table-note {
  margin-top: 18px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.ai-copy-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, .38fr);
  gap: clamp(24px, 5vw, 60px);
  align-items: start;
}

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

.ai-copy-main h3:not(:first-child) {
  margin-top: 38px;
}

.ai-copy-main p {
  color: var(--color-text-muted);
  font-size: 17px;
}

.ai-side-register {
  position: sticky;
  top: calc(var(--header-height) + 84px);
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-paper);
  box-shadow: var(--shadow-soft);
}

.ai-side-register h3 {
  margin-top: 12px;
}

.ai-side-register ul {
  margin-bottom: 24px;
  padding-left: 20px;
  color: var(--color-text-muted);
}

.ai-side-register li + li {
  margin-top: 8px;
}

.ai-side-register .btn {
  width: 100%;
}

.ai-dual-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-window);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

.ai-mode-panel {
  min-width: 0;
  padding: clamp(24px, 4vw, 42px);
}

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

.ai-mode-panel-strong {
  background: var(--color-paper);
}

.ai-mode-panel h3 {
  margin-top: 14px;
}

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

.ai-mode-panel ul {
  margin-bottom: 0;
  padding-left: 20px;
}

.ai-dev-ledger {
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-window);
  background: var(--color-paper);
}

.ai-dev-row {
  display: grid;
  grid-template-columns: minmax(150px, .26fr) minmax(0, 1fr);
  gap: clamp(22px, 4vw, 54px);
  padding: clamp(24px, 4vw, 42px);
}

.ai-dev-row + .ai-dev-row {
  border-top: 1px solid var(--color-border);
}

.ai-dev-row:nth-child(2) {
  background: var(--color-panel);
}

.ai-dev-key span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
}

.ai-dev-key h3 {
  margin-top: 10px;
}

.ai-dev-row p {
  color: var(--color-text-muted);
}

.ai-dev-row p:last-child {
  margin-bottom: 0;
}

.ai-selection {
  display: grid;
  gap: 12px;
}

.ai-selection-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.ai-selection-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: var(--radius-control);
  background: var(--color-accent);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-weight: 800;
}

.ai-selection-step h3 {
  margin-bottom: 7px;
  font-size: 24px;
}

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

.ai-service-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 30px;
  align-items: center;
  margin-top: 44px;
  padding: clamp(26px, 5vw, 48px);
  border-radius: var(--radius-window);
  background: var(--color-accent-dark);
  color: var(--color-paper);
  box-shadow: var(--shadow-window);
}

.ai-service-note h3 {
  color: var(--color-paper);
}

.ai-service-note p {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--color-panel-strong);
}

.ai-service-note .button-row {
  justify-content: flex-end;
}

.ai-service-note .btn-primary,
.ai-service-note .btn-secondary {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-accent-dark);
}

.ai-service-note .btn-primary:hover,
.ai-service-note .btn-secondary:hover {
  border-color: var(--color-panel-strong);
  background: var(--color-panel-strong);
  color: var(--color-accent-dark);
}

@keyframes ai-pulse {
  0%,
  100% {
    opacity: .4;
    transform: scale(.82);
  }

  50% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes ai-route-shift {
  to {
    stroke-dashoffset: -80;
  }
}

@media (max-width: 1020px) {
  .ai-hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .ai-route-window {
    width: 100%;
  }

  .ai-copy-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-side-register {
    position: static;
  }

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

  .ai-service-note .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 46px;
  }

  .ai-hero::after {
    height: 30%;
  }

  .ai-hero-lede {
    font-size: 16px;
  }

  .ai-principle-grid,
  .ai-dual-panel {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .ai-dev-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .ai-service-note .button-row {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .ai-window-label {
    max-width: 170px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .ai-window-body {
    padding: 12px;
  }

  .ai-route-diagram {
    min-width: 560px;
  }

  .ai-window-body {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .ai-terminal,
  .ai-window-status {
    min-width: 560px;
  }

  .ai-geo-pink {
    right: 20px;
  }

  .ai-selection-step {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 13px;
    padding: 18px;
  }

  .ai-selection-mark {
    width: 38px;
    height: 38px;
  }

  .ai-service-note .btn {
    flex: 1 1 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-terminal-dot,
  .ai-route-path {
    animation: none;
  }
}