:root {
  --manual-column-width: 920px;
  --manual-diagram-ratio: 1.1923;
}

.manual-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--border-strong) solid var(--color-accent-dark);
  background: var(--color-panel);
}

.manual-hero::before {
  position: absolute;
  top: 42px;
  right: -90px;
  width: 320px;
  height: 320px;
  border: var(--border-standard) dashed var(--color-border);
  border-radius: 50%;
  content: "";
}

.manual-hero::after {
  position: absolute;
  bottom: -120px;
  left: -80px;
  width: 300px;
  height: 300px;
  border: var(--border-strong) solid var(--color-panel-strong);
  border-radius: 50%;
  content: "";
}

.manual-hero-grid {
  position: relative;
  z-index: 1;
  min-height: 670px;
  padding-top: 72px;
  padding-bottom: 72px;
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(460px, 1.06fr);
  align-items: center;
  gap: 58px;
}

.manual-hero-copy h1 {
  max-width: 650px;
  margin-bottom: 24px;
  font-size: clamp(52px, 5.2vw, 72px);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.manual-intro {
  max-width: 670px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.85;
}

.manual-hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.manual-facts {
  margin: 31px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: var(--border-standard) solid var(--color-border);
  border-bottom: var(--border-standard) solid var(--color-border);
  list-style: none;
}

.manual-facts li {
  padding: 16px 14px;
  display: grid;
  gap: 2px;
  border-right: var(--border-standard) solid var(--color-border);
}

.manual-facts li:first-child {
  padding-left: 0;
}

.manual-facts li:last-child {
  border-right: 0;
}

.manual-facts strong {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 15px;
}

.manual-facts span {
  color: var(--color-muted);
  font-size: 12px;
}

.manual-diagram {
  width: 100%;
  aspect-ratio: var(--manual-diagram-ratio);
  overflow: hidden;
  border: var(--border-strong) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-white);
}

.manual-diagram svg {
  width: 100%;
  height: 100%;
}

.diagram-field {
  fill: var(--color-panel);
  stroke: var(--color-border);
  stroke-width: 2;
}

.diagram-route-under {
  fill: none;
  stroke: var(--color-white);
  stroke-width: 12;
  stroke-linecap: round;
}

.diagram-route {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 12 13;
  animation: manual-route 9s linear infinite;
}

.diagram-route-b {
  animation-direction: reverse;
}

.diagram-route-c {
  animation-duration: 7s;
}

.diagram-terminal {
  fill: var(--color-white);
  stroke: var(--color-accent-dark);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.diagram-terminal circle {
  fill: var(--color-panel-strong);
}

.diagram-core path {
  fill: var(--color-accent-dark);
}

.diagram-core .diagram-core-face {
  fill: var(--color-accent);
  stroke: var(--color-white);
  stroke-width: 4;
}

.diagram-core-dot {
  fill: var(--color-warn);
  stroke: var(--color-accent-dark);
  stroke-width: 5;
}

.diagram-core text {
  fill: var(--color-accent-dark);
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 850;
}

.diagram-pulse {
  fill: var(--color-warn);
  stroke: var(--color-accent-dark);
  stroke-width: 3;
  transform-box: fill-box;
  transform-origin: center;
  animation: manual-pulse 2.8s ease-in-out infinite;
}

.diagram-pulse-b {
  animation-delay: 1.4s;
}

.diagram-label {
  fill: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.manual-shell {
  padding-top: 28px;
  padding-bottom: var(--section-space);
}

.manual-shell > .toc-tabs {
  margin-bottom: 68px;
}

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

.manual-preface {
  margin-bottom: 76px;
  padding: clamp(24px, 4vw, 38px);
  border: var(--border-strong) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-white);
}

.manual-preface > p {
  margin-bottom: 26px;
  color: var(--color-text);
  font-size: 18px;
}

.manual-preface .callout {
  margin-bottom: 0;
}

.manual-content a {
  color: var(--color-accent);
  font-weight: 750;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-decoration-thickness: var(--border-standard);
  text-underline-offset: 4px;
}

.manual-content a:hover {
  color: var(--color-warn);
  text-decoration-color: var(--color-warn);
}

.manual-chapter {
  padding-top: 32px;
  padding-bottom: 88px;
  border-bottom: var(--border-strong) solid var(--color-panel-strong);
}

.manual-chapter:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.manual-chapter h2 {
  margin-bottom: 34px;
  font-size: clamp(32px, 4.2vw, 46px);
  line-height: 1.22;
}

.manual-chapter h3 {
  margin-top: 40px;
  margin-bottom: 15px;
  font-size: clamp(21px, 2.6vw, 27px);
}

.manual-chapter p,
.manual-chapter li {
  font-size: 17px;
  line-height: 1.92;
}

.manual-chapter p {
  margin-bottom: 22px;
}

.manual-chapter .callout {
  margin-top: 34px;
  margin-bottom: 18px;
}

.manual-table {
  width: 100%;
  min-width: 760px;
}

.manual-table td {
  vertical-align: top;
  color: var(--color-muted);
}

.manual-table td:first-child {
  color: var(--color-text);
  font-weight: 750;
}

.manual-compare {
  margin: 34px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  border: var(--border-strong) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-white);
}

.manual-compare > div {
  padding: 28px;
}

.manual-compare > div + div {
  border-left: var(--border-standard) solid var(--color-border);
  background: var(--color-panel);
}

.manual-compare h3 {
  margin-top: 0;
}

.manual-compare ul {
  margin-bottom: 0;
  padding-left: 22px;
}

.manual-compare li + li {
  margin-top: 8px;
}

.diagnostic-path {
  margin: 38px 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: var(--border-strong) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-white);
}

.diagnostic-path div {
  position: relative;
  min-height: 142px;
  padding: 25px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: var(--border-standard) solid var(--color-border);
}

.diagnostic-path div:last-child {
  border-right: 0;
}

.diagnostic-path span {
  width: fit-content;
  padding: 4px 9px;
  border: var(--border-standard) solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.diagnostic-path strong {
  display: block;
  color: var(--color-accent-dark);
  line-height: 1.45;
}

.manual-links {
  margin-top: 42px;
  padding: clamp(24px, 4vw, 38px);
  border: var(--border-strong) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-panel);
}

.manual-links h3 {
  margin-top: 0;
}

.manual-links p:last-child {
  margin-bottom: 0;
}

@keyframes manual-route {
  to {
    stroke-dashoffset: -100;
  }
}

@keyframes manual-pulse {
  50% {
    transform: scale(1.32);
  }
}

@media (max-width: 1000px) {
  .manual-hero-grid {
    min-height: 0;
    grid-template-columns: 1fr;
  }

  .manual-diagram {
    max-width: 680px;
    margin-inline: auto;
  }

  .diagnostic-path {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .diagnostic-path div:nth-child(2) {
    border-right: 0;
  }

  .diagnostic-path div:nth-child(-n + 2) {
    border-bottom: var(--border-standard) solid var(--color-border);
  }
}

@media (max-width: 640px) {
  .manual-hero::before,
  .manual-hero::after {
    display: none;
  }

  .manual-hero-grid {
    padding-top: 48px;
    padding-bottom: 58px;
    gap: 42px;
  }

  .manual-hero-copy h1 {
    font-size: clamp(34px, 10vw, 40px);
    letter-spacing: -0.01em;
  }

  .manual-hero-actions {
    flex-direction: column;
  }

  .manual-facts {
    grid-template-columns: 1fr;
  }

  .manual-facts li,
  .manual-facts li:first-child {
    padding: 12px 0;
    border-right: 0;
    border-bottom: var(--border-standard) solid var(--color-border);
  }

  .manual-facts li:last-child {
    border-bottom: 0;
  }

  .manual-shell {
    padding-top: 18px;
  }

  .manual-shell > .toc-tabs {
    margin-bottom: 48px;
  }

  .manual-preface {
    margin-bottom: 52px;
  }

  .manual-preface > p,
  .manual-chapter p,
  .manual-chapter li {
    font-size: 16px;
  }

  .manual-chapter {
    padding-top: 20px;
    padding-bottom: 62px;
  }

  .manual-chapter h2 {
    font-size: 31px;
  }

  .manual-compare,
  .diagnostic-path {
    grid-template-columns: 1fr;
  }

  .manual-compare > div + div {
    border-top: var(--border-standard) solid var(--color-border);
    border-left: 0;
  }

  .diagnostic-path div,
  .diagnostic-path div:nth-child(2) {
    min-height: 112px;
    border-right: 0;
    border-bottom: var(--border-standard) solid var(--color-border);
  }

  .diagnostic-path div:last-child {
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .diagram-route,
  .diagram-pulse {
    animation: none;
  }
}