.ai-hero {
  padding-top: 18px;
  padding-bottom: clamp(42px, 6vw, 76px);
}

.ai-hero-panel {
  position: relative;
  display: grid;
  min-height: 660px;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
  overflow: hidden;
  padding: clamp(34px, 5vw, 72px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-hero);
  background: var(--color-panel);
}

.ai-hero-panel::before,
.ai-hero-panel::after {
  position: absolute;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  content: "";
  pointer-events: none;
}

.ai-hero-panel::before {
  top: -96px;
  right: 18%;
  width: 240px;
  height: 240px;
  opacity: 0.76;
}

.ai-hero-panel::after {
  right: -72px;
  bottom: -120px;
  width: 310px;
  height: 310px;
  opacity: 0.62;
}

.ai-hero-copy {
  position: relative;
  z-index: 3;
  max-width: 650px;
}

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

.ai-hero-lead {
  max-width: 620px;
  margin: 26px 0 0;
  color: var(--color-muted);
  font-size: clamp(17px, 1.6vw, 20px);
}

.ai-hero-lead strong {
  color: var(--color-text);
}

.ai-route-visual {
  position: relative;
  z-index: 2;
  min-height: 520px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-hero);
  background:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px),
    var(--color-white);
  background-size: 48px 48px;
}

.ai-route-visual::before,
.ai-route-visual::after {
  position: absolute;
  inset: 50%;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  content: "";
  transform: translate(-50%, -50%);
}

.ai-route-visual::before {
  width: 310px;
  height: 310px;
  opacity: 0.45;
}

.ai-route-visual::after {
  width: 430px;
  height: 430px;
  opacity: 0.2;
}

.ai-core {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  display: flex;
  width: 170px;
  height: 170px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  border: 12px solid var(--color-accent);
  border-radius: var(--radius-pill);
  background: var(--color-white);
  box-shadow: var(--shadow-bubble);
  transform: translate(-50%, -50%);
}

.ai-core span {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.ai-core strong {
  margin-top: 7px;
  font-size: 19px;
}

.ai-orbit {
  position: absolute;
  z-index: 5;
  display: inline-flex;
  min-height: 38px;
  max-width: 150px;
  align-items: center;
  padding-inline: 13px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-white);
  box-shadow: var(--shadow-bubble);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
  animation: ai-orbit-pulse 4.6s ease-in-out infinite;
}

.ai-orbit::before {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  margin-right: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.ai-orbit-chatgpt {
  top: 9%;
  left: 35%;
}

.ai-orbit-claude {
  top: 25%;
  right: 4%;
  animation-delay: 700ms;
}

.ai-orbit-gemini {
  right: 8%;
  bottom: 20%;
  animation-delay: 1400ms;
}

.ai-orbit-copilot {
  bottom: 7%;
  left: 37%;
  animation-delay: 2100ms;
}

.ai-orbit-cursor {
  bottom: 23%;
  left: 3%;
  animation-delay: 2800ms;
}

.ai-orbit-midjourney {
  top: 24%;
  left: 2%;
  animation-delay: 3500ms;
}

.ai-route-line {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  width: 78%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  opacity: 0.42;
  transform-origin: left center;
}

.ai-route-line-a {
  transform: rotate(18deg) translateX(-50%);
}

.ai-route-line-b {
  transform: rotate(138deg) translateX(-50%);
}

.ai-route-line-c {
  transform: rotate(258deg) translateX(-50%);
}

.ai-toc-wrap {
  position: relative;
  z-index: 10;
}

.ai-section-heading {
  max-width: 850px;
  margin-bottom: clamp(32px, 5vw, 58px);
}

.ai-section-heading h2 {
  margin: 18px 0 16px;
}

.ai-section-heading p,
.ai-split-heading > p {
  color: var(--color-muted);
  font-size: 17px;
}

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

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

.ai-principle {
  display: grid;
  min-height: 280px;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 22px;
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-white);
}

.ai-principle-featured {
  grid-row: span 2;
  align-content: start;
  background: var(--color-accent-pale);
}

.ai-principle h3 {
  margin-bottom: 12px;
  font-size: 25px;
}

.ai-principle p {
  color: var(--color-muted);
}

.ai-index {
  display: inline-flex;
  min-width: 54px;
  height: 34px;
  align-items: center;
  justify-content: center;
  padding-inline: 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-size: 10px;
  font-weight: 850;
}

.ai-tool-table td {
  min-width: 190px;
}

.ai-tool-table td:first-child {
  min-width: 135px;
  font-family: var(--font-mono);
}

.ai-table-note {
  margin-top: 24px;
}

.ai-split-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  align-items: end;
  gap: clamp(28px, 6vw, 88px);
  margin-bottom: clamp(34px, 5vw, 60px);
}

.ai-split-heading h2 {
  margin: 18px 0 0;
}

.ai-process {
  position: relative;
  display: grid;
  gap: 14px;
}

.ai-process::before {
  position: absolute;
  top: 30px;
  bottom: 30px;
  left: 29px;
  width: 1px;
  background: var(--color-border);
  content: "";
}

.ai-process-step {
  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-card);
  background: var(--color-white);
}

.ai-step-marker {
  position: relative;
  z-index: 2;
  display: inline-flex;
  width: 60px;
  height: 60px;
  align-items: center;
  justify-content: center;
  border: 7px solid var(--color-white);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 900;
}

.ai-process-step h3 {
  margin-bottom: 8px;
  font-size: 24px;
}

.ai-process-step p {
  color: var(--color-muted);
}

.ai-account-note {
  display: grid;
  grid-template-columns: minmax(260px, 0.6fr) minmax(0, 1fr);
  align-items: center;
  gap: 28px;
  margin-top: 20px;
  padding: clamp(26px, 4vw, 42px);
}

.ai-account-note h3 {
  margin: 14px 0 0;
}

.ai-account-note p {
  color: var(--color-muted);
}

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

.ai-mode-card {
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-white);
}

.ai-mode-card-accent {
  border-color: var(--color-accent);
  background: var(--color-accent-pale);
}

.ai-mode-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 26px;
}

.ai-mode-top h3 {
  margin-bottom: 0;
}

.ai-mode-card .check-list {
  margin-bottom: 26px;
}

.ai-mode-card p {
  color: var(--color-muted);
}

.ai-dev-browser {
  display: grid;
  grid-template-columns: minmax(190px, 0.32fr) minmax(0, 1fr);
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-hero);
  background: var(--color-white);
}

.ai-dev-index {
  display: grid;
  align-content: start;
  gap: 5px;
  padding: 18px;
  border-right: 1px solid var(--color-border);
  background: var(--color-panel);
}

.ai-dev-index a {
  display: grid;
  min-height: 62px;
  grid-template-columns: 48px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-weight: 750;
}

.ai-dev-index a:hover {
  background: var(--color-accent-soft);
  color: var(--color-text);
}

.ai-dev-index span {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-dev-content {
  padding: clamp(28px, 5vw, 58px);
}

.ai-dev-content article {
  padding-bottom: 38px;
  scroll-margin-top: calc(var(--toc-top) + var(--toc-height) + 24px);
}

.ai-dev-content article + article {
  padding-top: 38px;
  border-top: 1px solid var(--color-border);
}

.ai-dev-content article:last-child {
  padding-bottom: 0;
}

.ai-dev-content h3 {
  margin-bottom: 14px;
}

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

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

.ai-diagnosis-list .faq-item {
  align-self: start;
}

.ai-route-choice {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.7fr);
  gap: clamp(30px, 6vw, 88px);
}

.ai-route-choice-copy h2 {
  margin: 18px 0 20px;
}

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

.ai-route-links {
  display: grid;
  gap: 14px;
}

.ai-route-link {
  position: relative;
  display: flex;
  min-height: 210px;
  flex-direction: column;
  align-items: flex-start;
  padding: 28px 62px 28px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.ai-route-link:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.ai-route-link strong {
  margin-top: 18px;
  font-size: 20px;
}

.ai-route-link > span:not(.badge) {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

.ai-route-link b {
  position: absolute;
  right: 26px;
  bottom: 26px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 22px;
}

.ai-final-note {
  margin-top: 40px;
}

@keyframes ai-orbit-pulse {
  50% {
    transform: translateY(-5px);
  }
}

@media (max-width: 1080px) {
  .ai-hero-panel {
    min-height: 610px;
    grid-template-columns: minmax(0, 1fr) minmax(380px, 0.9fr);
    padding: 42px;
  }

  .ai-route-visual {
    min-height: 480px;
  }

  .ai-orbit-gemini {
    right: 2%;
  }

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

  .ai-principle-featured {
    grid-row: auto;
  }
}

@media (max-width: 860px) {
  .ai-hero-panel {
    grid-template-columns: 1fr;
    padding: 38px var(--gutter);
  }

  .ai-route-visual {
    min-height: 480px;
  }

  .ai-split-heading,
  .ai-account-note,
  .ai-comparison,
  .ai-route-choice {
    grid-template-columns: 1fr;
  }

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

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

  .ai-dev-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }
}

@media (max-width: 640px) {
  .ai-hero {
    padding-top: 10px;
  }

  .ai-hero-panel {
    gap: 32px;
    padding-top: 30px;
    padding-bottom: 30px;
  }

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

  .ai-route-visual {
    min-height: 370px;
  }

  .ai-route-visual::before {
    width: 220px;
    height: 220px;
  }

  .ai-route-visual::after {
    width: 310px;
    height: 310px;
  }

  .ai-core {
    width: 128px;
    height: 128px;
    border-width: 9px;
  }

  .ai-core strong {
    font-size: 15px;
  }

  .ai-orbit {
    min-height: 32px;
    padding-inline: 9px;
    font-size: 9px;
  }

  .ai-orbit-chatgpt {
    top: 6%;
    left: 29%;
  }

  .ai-orbit-claude {
    top: 22%;
    right: 1%;
  }

  .ai-orbit-gemini {
    right: 1%;
    bottom: 18%;
  }

  .ai-orbit-copilot {
    bottom: 5%;
    left: 31%;
  }

  .ai-orbit-cursor {
    bottom: 20%;
    left: 1%;
  }

  .ai-orbit-midjourney {
    top: 22%;
    left: 1%;
  }

  .ai-principle {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 24px;
  }

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

  .ai-process-step {
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 22px;
  }

  .ai-step-marker {
    width: 46px;
    height: 46px;
    border-width: 0;
  }

  .ai-mode-top {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .ai-dev-content {
    padding: 24px;
  }

  .ai-route-link {
    min-height: 190px;
    padding: 24px 52px 24px 24px;
  }
}