:root {
  --ai-hero-min: 760px;
  --ai-board-width: 820px;
  --ai-board-height: 310px;
  --ai-orbit-outer-width: 690px;
  --ai-orbit-outer-height: 236px;
  --ai-orbit-inner-width: 430px;
  --ai-orbit-inner-height: 150px;
  --ai-core-size: 126px;
  --ai-line-dashed: 1px dashed var(--color-line-soft);
  --ai-grid-line: var(--color-line-faint);
  --ai-panel-gap: 18px;
  --ai-content-width: 980px;
}

.ai-article {
  position: relative;
}

.ai-hero {
  position: relative;
  min-height: var(--ai-hero-min);
  overflow: hidden;
  border-bottom: var(--border-thin) solid var(--color-line-faint);
  background:
    linear-gradient(var(--ai-grid-line) var(--border-thin), transparent var(--border-thin)),
    linear-gradient(90deg, var(--ai-grid-line) var(--border-thin), transparent var(--border-thin)),
    radial-gradient(760px 390px at 78% 46%, var(--color-cyan-wash), transparent 70%),
    radial-gradient(620px 380px at 17% 12%, var(--color-pink-wash), transparent 70%),
    var(--color-bg);
  background-size:
    46px 46px,
    46px 46px,
    auto,
    auto,
    auto;
}

.ai-hero::before,
.ai-hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.ai-hero::before {
  inset: 0;
  background:
    radial-gradient(1px 1px at 8% 18%, var(--color-star-strong) 50%, transparent 51%),
    radial-gradient(1px 1px at 18% 67%, var(--color-star-soft) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 34% 26%, var(--color-star-mid) 50%, transparent 51%),
    radial-gradient(1px 1px at 62% 14%, var(--color-star-soft) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 81% 23%, var(--color-star-strong) 50%, transparent 51%),
    radial-gradient(1px 1px at 93% 71%, var(--color-star-soft) 50%, transparent 51%);
}

.ai-hero::after {
  right: -12%;
  bottom: -220px;
  left: -12%;
  height: 330px;
  border-top: var(--border-thin) solid var(--color-line-soft);
  border-radius: 50%;
  background: var(--color-cyan-wash);
}

.ai-hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: var(--ai-hero-min);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 68px;
  padding-bottom: 44px;
  text-align: center;
}

.ai-hero h1 {
  margin-top: 20px;
  margin-bottom: 0;
}

.ai-title-slant {
  display: inline-block;
  margin-inline: 0.08em;
  color: var(--color-accent);
  font-style: italic;
  transform: rotate(-4deg) translateY(-3px);
}

.ai-hero-copy {
  max-width: 720px;
  margin: 22px auto 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.95;
}

.ai-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 26px;
}

.ai-trust-row {
  display: flex;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

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

.ai-trust-row span::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  transform: translateY(-50%);
}

.ai-star {
  position: absolute;
  z-index: 1;
  color: var(--color-warning);
  font-family: var(--font-mono);
  font-size: 24px;
  opacity: 0.72;
  pointer-events: none;
}

.ai-star-a {
  top: 20%;
  left: 8%;
  transform: rotate(12deg);
}

.ai-star-b {
  top: 28%;
  right: 9%;
  color: var(--color-line);
  transform: rotate(-9deg);
}

.ai-orbit-board {
  position: relative;
  width: min(var(--ai-board-width), 100%);
  height: var(--ai-board-height);
  margin-top: 30px;
}

.ai-orbit-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border: var(--ai-line-dashed);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.ai-orbit-ring-outer {
  width: min(var(--ai-orbit-outer-width), 90%);
  height: var(--ai-orbit-outer-height);
}

.ai-orbit-ring-inner {
  width: min(var(--ai-orbit-inner-width), 58%);
  height: var(--ai-orbit-inner-height);
  border-color: var(--color-pink-glow);
  transform: translate(-50%, -50%) rotate(-7deg);
}

.ai-relay-core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  width: var(--ai-core-size);
  height: var(--ai-core-size);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  border: var(--border-thin) solid var(--color-line);
  border-radius: 50%;
  background: var(--color-panel);
  box-shadow: var(--shadow-cyan);
  transform: translate(-50%, -50%);
}

.ai-relay-core svg {
  width: 76px;
  height: 76px;
}

.ai-relay-core span {
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.ai-core-shell {
  fill: var(--color-panel-strong);
  stroke: var(--color-line);
  stroke-width: 1.5;
}

.ai-core-wing {
  fill: var(--color-panel);
  stroke: var(--color-line);
  stroke-width: 1.3;
}

.ai-core-grid,
.ai-core-antenna {
  fill: none;
  stroke: var(--color-line);
  stroke-linecap: round;
  stroke-width: 1.2;
}

.ai-core-eye {
  fill: var(--color-text);
}

.ai-core-pupil {
  fill: var(--color-bg);
}

.ai-core-led {
  fill: var(--color-accent);
}

.ai-tool-chip {
  position: absolute;
  z-index: 2;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-xs);
  background: var(--color-panel-glass);
  padding: 6px 11px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  box-shadow: var(--shadow-cyan);
  white-space: nowrap;
}

.ai-tool-chat {
  top: 22px;
  left: 19%;
}

.ai-tool-claude {
  top: 32px;
  right: 18%;
}

.ai-tool-gemini {
  top: 44%;
  right: 4%;
}

.ai-tool-copilot {
  right: 19%;
  bottom: 22px;
}

.ai-tool-midjourney {
  bottom: 30px;
  left: 14%;
}

.ai-tool-cursor {
  top: 43%;
  left: 3%;
}

.ai-reading {
  position: relative;
  padding-top: 28px;
  padding-bottom: var(--section-space);
}

.ai-reading > .toc-tabs {
  margin-inline: auto;
}

.ai-content {
  width: 100%;
  max-width: var(--ai-content-width);
  margin-inline: auto;
}

.ai-content .section-head {
  margin-bottom: 36px;
}

.ai-content .section-head h2 {
  margin-top: 14px;
}

.ai-layer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ai-panel-gap);
}

.ai-layer-card {
  position: relative;
  min-width: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-panel);
  background: var(--color-panel);
  padding: 28px;
  box-shadow: var(--shadow-cyan);
}

.ai-layer-card::before {
  content: "";
  position: absolute;
  top: 24px;
  left: -1px;
  width: 4px;
  height: 34px;
  background: var(--color-warning);
}

.ai-layer-code {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

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

.ai-layer-card p,
.ai-note p,
.ai-compare-panel li,
.ai-dev-step p,
.ai-choice-panel p {
  color: var(--color-muted);
}

.ai-layer-card p,
.ai-note p,
.ai-dev-step p {
  margin-bottom: 0;
}

.ai-tool-table td {
  min-width: 140px;
}

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

.ai-tool-notes {
  display: grid;
  gap: var(--ai-panel-gap);
}

.ai-note {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  align-items: start;
  gap: 30px;
}

.ai-note-head {
  position: relative;
  border-right: var(--border-thin) solid var(--color-line-soft);
  padding-right: 24px;
}

.ai-note-head h3 {
  margin-top: 14px;
  margin-bottom: 0;
}

.ai-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 80px minmax(0, 1fr);
  align-items: stretch;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-panel);
  background: var(--color-panel);
  box-shadow: var(--shadow-cyan);
}

.ai-compare-panel {
  padding: clamp(24px, 4vw, 38px);
}

.ai-compare-panel ul {
  margin-bottom: 0;
}

.ai-compare-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: var(--border-thin) solid var(--color-line-soft);
  border-left: var(--border-thin) solid var(--color-line-soft);
  background: var(--color-panel-strong);
}

.ai-compare-divider span {
  color: var(--color-warning);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
}

.ai-dev-flow {
  position: relative;
  display: grid;
  gap: 16px;
}

.ai-dev-flow::before {
  content: "";
  position: absolute;
  top: 30px;
  bottom: 30px;
  left: 45px;
  border-left: var(--ai-line-dashed);
}

.ai-dev-step {
  position: relative;
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  border: var(--border-thin) solid var(--color-line-soft);
  border-radius: var(--radius-control);
  background: var(--color-panel);
  padding: 24px;
}

.ai-dev-marker {
  position: relative;
  z-index: 2;
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: var(--border-thin) solid var(--color-warning);
  border-radius: var(--radius-xs);
  background: var(--color-panel-strong);
  color: var(--color-warning);
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-dev-step h3 {
  margin-bottom: 10px;
}

.ai-choice-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 36px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-panel);
  background:
    linear-gradient(112deg, var(--color-pink-wash), transparent 45%),
    var(--color-panel-strong);
  padding: clamp(26px, 5vw, 48px);
  box-shadow: var(--shadow-cyan);
}

.ai-choice-panel h2 {
  margin-top: 14px;
}

.ai-choice-actions {
  display: grid;
  gap: 12px;
  min-width: 150px;
}

@media (max-width: 900px) {
  .ai-note {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 22px;
  }

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

  .ai-choice-actions {
    display: flex;
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  :root {
    --ai-hero-min: 680px;
    --ai-board-height: 270px;
    --ai-core-size: 104px;
  }

  .ai-hero-inner {
    padding-top: 48px;
  }

  .ai-hero-copy {
    font-size: 16px;
    line-height: 1.8;
  }

  .ai-hero-actions {
    width: 100%;
    flex-direction: column;
  }

  .ai-hero-actions .btn {
    width: min(100%, 340px);
  }

  .ai-star {
    display: none;
  }

  .ai-title-slant {
    transform: none;
  }

  .ai-orbit-ring-outer {
    width: 88%;
    height: 202px;
  }

  .ai-orbit-ring-inner {
    width: 54%;
    height: 126px;
  }

  .ai-tool-chat {
    top: 15px;
    left: 7%;
  }

  .ai-tool-claude {
    top: 20px;
    right: 6%;
  }

  .ai-tool-gemini {
    top: 46%;
    right: 0;
  }

  .ai-tool-copilot {
    right: 7%;
    bottom: 13px;
  }

  .ai-tool-midjourney {
    bottom: 18px;
    left: 3%;
  }

  .ai-tool-cursor {
    top: 45%;
    left: 0;
  }

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

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

  .ai-note-head {
    border-right: 0;
    border-bottom: var(--border-thin) solid var(--color-line-soft);
    padding-right: 0;
    padding-bottom: 16px;
  }

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

  .ai-compare-divider {
    min-height: 52px;
    border-top: var(--border-thin) solid var(--color-line-soft);
    border-right: 0;
    border-bottom: var(--border-thin) solid var(--color-line-soft);
    border-left: 0;
  }

  .ai-compare-divider span {
    writing-mode: horizontal-tb;
  }

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

  .ai-dev-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .ai-dev-marker {
    width: 78px;
  }
}

@media (max-width: 520px) {
  :root {
    --ai-board-height: 292px;
  }

  .ai-trust-row {
    align-items: flex-start;
    flex-direction: column;
    margin-top: 22px;
    text-align: left;
  }

  .ai-orbit-ring {
    display: none;
  }

  .ai-orbit-board {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: end;
    gap: 8px;
    padding-top: 126px;
  }

  .ai-relay-core {
    top: 58px;
  }

  .ai-tool-chip {
    position: static;
    max-width: 100%;
    overflow: hidden;
    text-align: center;
  }

  .ai-choice-actions {
    display: grid;
  }

  .ai-choice-actions .btn {
    width: 100%;
  }
}