.ai-hero {
  position: relative;
  padding-top: clamp(64px, 8vw, 104px);
  padding-bottom: clamp(72px, 9vw, 120px);
  overflow: hidden;
  background:
    radial-gradient(circle at 78% 28%, var(--color-glow), var(--color-transparent) 34%),
    linear-gradient(180deg, var(--color-bg-deep), var(--color-bg));
}

.ai-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--color-grid-strong) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid-strong) 1px, var(--color-transparent) 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.ai-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(480px, 1.12fr);
  align-items: center;
  gap: clamp(42px, 7vw, 92px);
}

.ai-hero-copy {
  max-width: 640px;
}

.ai-hero h1 {
  max-width: 620px;
  margin: 18px 0 0;
}

.ai-hero-actions {
  margin-top: 24px;
}

.ai-hero-summary {
  max-width: 620px;
  margin: 24px 0 0;
  font-size: clamp(16px, 1.6vw, 19px);
}

.ai-fact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 26px;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.ai-fact-line span {
  position: relative;
  padding-left: 14px;
}

.ai-fact-line span::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

.ai-synapse {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(145deg, var(--color-panel-raised), var(--color-bg-deep));
  background-size: 36px 36px, 36px 36px, 100% 100%;
  box-shadow: var(--shadow-panel), var(--shadow-inset);
}

.ai-synapse::before {
  content: "";
  position: absolute;
  top: -140px;
  left: -70px;
  width: 440px;
  height: 300px;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle, var(--color-glow), var(--color-transparent) 68%);
  pointer-events: none;
}

.ai-synapse-head,
.ai-synapse-foot {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
}

.ai-synapse-head {
  height: 52px;
  justify-content: space-between;
  padding-inline: 20px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-white-soft);
}

.ai-synapse-state {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent-soft);
}

.ai-synapse-state i {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  box-shadow: 0 0 12px var(--color-success);
}

.ai-synapse-svg {
  width: 100%;
  height: 395px;
}

.ai-path {
  fill: none;
  vector-effect: non-scaling-stroke;
}

.ai-path-muted {
  stroke: var(--color-border);
  stroke-width: 1.2;
}

.ai-path-live {
  stroke: var(--color-accent-dark);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-dasharray: 6 9;
}

.ai-path-fine {
  stroke: var(--color-border-bright);
  stroke-width: 0.8;
  opacity: 0.72;
}

.ai-node-halo {
  fill: var(--color-glow-soft);
  stroke: var(--color-accent-dark);
  stroke-width: 1;
}

.ai-node {
  fill: var(--color-panel-raised);
  stroke: var(--color-accent);
  stroke-width: 1.4;
}

.ai-node-core,
.ai-pulse {
  fill: var(--color-accent-soft);
}

.ai-node-muted {
  fill: var(--color-panel);
  stroke: var(--color-border-bright);
  stroke-width: 1;
}

.ai-node-ring {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1;
  opacity: 0.5;
  transform-box: fill-box;
  transform-origin: center;
  animation: ai-ring 3.8s ease-in-out infinite;
}

.ai-pulse {
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
}

.ai-pulse-a {
  animation: ai-pulse-forward 5.6s ease-in-out infinite;
}

.ai-pulse-b {
  animation: ai-pulse-back 6.2s ease-in-out 1.4s infinite;
}

.ai-svg-label {
  fill: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.ai-svg-label-active {
  fill: var(--color-accent-soft);
}

.ai-synapse-foot {
  position: absolute;
  right: 18px;
  bottom: 16px;
  left: 18px;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-synapse-foot span {
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-bg-deep);
}

.ai-document {
  position: relative;
}

.ai-article {
  max-width: 1100px;
  margin-inline: auto;
}

.ai-section {
  padding-top: clamp(54px, 7vw, 92px);
  padding-bottom: clamp(54px, 7vw, 92px);
  scroll-margin-top: calc(var(--toc-top) + 72px);
}

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

.ai-browser {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel), var(--shadow-inset);
}

.ai-browser-index {
  padding: 28px 18px;
  border-right: 1px solid var(--color-border);
  background:
    linear-gradient(180deg, var(--color-highlight), var(--color-transparent)),
    var(--color-bg-deep);
}

.ai-index-label {
  display: block;
  margin: 0 10px 20px;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.ai-browser-index a {
  min-height: 46px;
  display: flex;
  align-items: center;
  padding-inline: 12px;
  border-left: 2px solid var(--color-transparent);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.ai-browser-index a:hover,
.ai-browser-index a.is-current {
  border-left-color: var(--color-accent);
  color: var(--color-text);
  background: var(--color-highlight);
}

.ai-browser-content {
  padding: clamp(26px, 4vw, 52px);
}

.ai-detail {
  position: relative;
  padding-left: 36px;
}

.ai-detail + .ai-detail {
  margin-top: 44px;
  padding-top: 44px;
  border-top: 1px solid var(--color-border);
}

.ai-detail::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 0;
  width: 12px;
  height: 12px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  background: var(--color-panel-raised);
  box-shadow: 0 0 16px var(--color-glow);
}

.ai-detail + .ai-detail::before {
  top: 51px;
}

.ai-detail h3 {
  margin: 7px 0 12px;
}

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

.ai-detail-code,
.ai-dev-label,
.ai-route-summary-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.tool-matrix-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-inset);
  -webkit-overflow-scrolling: touch;
}

.tool-matrix {
  min-width: 880px;
  margin: 0;
}

.tool-matrix td:first-child {
  color: var(--color-text);
  font-family: var(--font-mono);
}

.ai-flow {
  position: relative;
  display: grid;
  gap: 18px;
}

.ai-flow::before {
  content: "";
  position: absolute;
  top: 28px;
  bottom: 28px;
  left: 29px;
  width: 1px;
  background: linear-gradient(var(--color-accent-dark), var(--color-border));
}

.ai-flow-item {
  position: relative;
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 24px;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-inset);
}

.ai-flow-mark {
  position: relative;
  z-index: 1;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-bg-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  box-shadow: 0 0 20px var(--color-glow-soft);
}

.ai-flow-item h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.ai-flow-item p {
  margin-bottom: 0;
}

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

.ai-compare-panel {
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 12% 0%, var(--color-glow-soft), var(--color-transparent) 36%),
    var(--color-panel);
  box-shadow: var(--shadow-card), var(--shadow-inset);
}

.ai-compare-panel h3 {
  margin: 9px 0 12px;
}

.ai-compare-panel .check-list {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

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

.ai-dev-card {
  position: relative;
  padding: clamp(24px, 3vw, 34px);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-inset);
}

.ai-dev-card::after {
  content: "";
  position: absolute;
  right: -54px;
  bottom: -54px;
  width: 116px;
  height: 116px;
  border: 1px dashed var(--color-accent-dark);
  border-radius: var(--radius-pill);
  opacity: 0.45;
  pointer-events: none;
}

.ai-dev-card h3 {
  margin: 9px 0 12px;
}

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

.ai-fault-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 12px;
}

.ai-route-guide {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: 22px;
  align-items: stretch;
}

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

.ai-route-principles article {
  padding: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-route-principles h3 {
  margin: 7px 0 8px;
  font-size: 1.08rem;
}

.ai-route-principles p {
  margin-bottom: 0;
}

.ai-route-summary {
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 14% 0%, var(--color-glow), var(--color-transparent) 40%),
    var(--color-panel-raised);
  box-shadow: var(--shadow-panel), var(--shadow-inset);
}

.ai-route-summary h3 {
  margin: 12px 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 500;
}

.ai-route-summary .button-row {
  margin-top: 26px;
}

@keyframes ai-ring {
  0%,
  100% {
    opacity: 0.28;
    transform: scale(0.9);
  }

  50% {
    opacity: 0.7;
    transform: scale(1.16);
  }
}

@keyframes ai-pulse-forward {
  0% {
    opacity: 0;
    transform: translate(0, 0) scale(0.7);
  }

  18% {
    opacity: 1;
  }

  78% {
    opacity: 0.8;
  }

  100% {
    opacity: 0;
    transform: translate(580px, -112px) scale(1.2);
  }
}

@keyframes ai-pulse-back {
  0% {
    opacity: 0;
    transform: translate(0, 0) scale(0.7);
  }

  18% {
    opacity: 0.92;
  }

  78% {
    opacity: 0.72;
  }

  100% {
    opacity: 0;
    transform: translate(-305px, 127px) scale(1.18);
  }
}

@media (max-width: 1040px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

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

  .ai-synapse {
    min-height: 460px;
  }

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

  .ai-route-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .ai-browser {
    grid-template-columns: 1fr;
  }

  .ai-browser-index {
    display: flex;
    max-width: 100%;
    padding: 10px;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .ai-index-label {
    display: none;
  }

  .ai-browser-index a {
    min-height: 42px;
    flex: 0 0 auto;
    border-left: 0;
    border-bottom: 2px solid var(--color-transparent);
  }

  .ai-browser-index a:hover,
  .ai-browser-index a.is-current {
    border-left-color: var(--color-transparent);
    border-bottom-color: var(--color-accent);
  }

  .ai-compare,
  .ai-dev-grid,
  .ai-fault-list {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .ai-hero {
    padding-top: 48px;
  }

  .ai-hero-grid {
    gap: 38px;
  }

  .ai-hero-summary {
    font-size: 1rem;
  }

  .ai-synapse {
    min-height: 370px;
    border-radius: var(--radius-lg);
  }

  .ai-synapse-head {
    height: 46px;
    padding-inline: 14px;
    font-size: 0.58rem;
  }

  .ai-synapse-svg {
    height: 310px;
  }

  .ai-synapse-foot {
    display: none;
  }

  .ai-browser-content {
    padding: 22px 18px;
  }

  .ai-detail {
    padding-left: 27px;
  }

  .ai-flow::before {
    display: none;
  }

  .ai-flow-item {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 20px;
  }

  .ai-flow-mark {
    width: 34px;
    height: 34px;
  }

  .ai-route-summary {
    border-radius: var(--radius-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-node-ring,
  .ai-pulse {
    animation: none;
  }

  .ai-pulse {
    opacity: 0.72;
  }
}