* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--ky-page);
}

body {
  margin: 0;
  color: var(--ky-text);
  background: var(--ky-page);
  font: 400 var(--ky-text-body)/var(--ky-line-body) var(--ky-font-body);
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}

button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: var(--ky-info);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--ky-focus);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  color: var(--ky-on-button);
  background: var(--ky-button);
  border-radius: var(--ky-radius-control);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--ky-border);
  background: color-mix(in srgb, var(--ky-page) 92%, transparent);
  backdrop-filter: blur(12px);
}

.header-inner,
.content,
.footer-inner {
  width: min(100% - 48px, 1180px);
  margin-inline: auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--ky-text);
  font-weight: 600;
  text-decoration: none;
}

.brand img {
  width: 30px;
  height: 30px;
}

.logo-dark {
  display: none;
}

[data-ky-theme="dark"] .logo-light {
  display: none;
}

[data-ky-theme="dark"] .logo-dark {
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.site-nav a,
.theme-toggle {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  color: var(--ky-muted);
  background: transparent;
  border: 0;
  font-size: var(--ky-text-ui);
  font-weight: 500;
  line-height: var(--ky-line-ui);
  text-decoration: none;
  cursor: pointer;
}

.site-nav a {
  border-radius: var(--ky-radius-control);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  justify-content: center;
  flex: 0 0 40px;
  padding: 0;
  border-radius: var(--ky-radius-control);
}

.theme-icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.site-nav a:hover,
.theme-toggle:hover {
  color: var(--ky-text);
  background: var(--ky-hover);
}

.site-nav a[aria-current="page"] {
  color: var(--ky-text);
  background: var(--ky-selected);
}

.content {
  padding-block: 80px 96px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  align-items: end;
  gap: 64px;
  min-height: 520px;
  padding-block: 32px 80px;
}

.hero.compact {
  min-height: auto;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.55fr);
  padding-block: 24px 64px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 20px;
  color: var(--ky-muted);
  font: 600 var(--ky-text-meta)/var(--ky-line-ui) var(--ky-font-body);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 36px;
  height: 3px;
  content: '';
  background: var(--ky-accent-blue);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hero h1,
.page-title {
  max-width: 13ch;
  margin-bottom: 24px;
  font: 500 clamp(3rem, 7vw, var(--ky-text-display))/1.02 var(--ky-font-heading);
  letter-spacing: -0.035em;
}

.hero.compact h1 {
  max-width: 16ch;
  font-size: clamp(2.6rem, 6vw, 3.75rem);
}

.hero-copy {
  max-width: 60ch;
  color: var(--ky-muted);
  font-size: 1.125rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  color: var(--ky-on-button);
  background: var(--ky-button);
  border: 1px solid var(--ky-button);
  border-radius: var(--ky-radius-control);
  font-size: var(--ky-text-ui);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  color: var(--ky-on-button);
  background: var(--ky-button-hover);
  text-decoration: none;
}

.button.secondary {
  color: var(--ky-text);
  background: transparent;
  border-color: var(--ky-control-border);
}

.button.secondary:hover {
  color: var(--ky-text);
  background: var(--ky-hover);
}

.architecture {
  min-width: 0;
  margin: 0;
  padding: 24px;
  background: var(--ky-canvas);
  border: 1px solid var(--ky-border);
  border-radius: var(--ky-radius-panel);
}

.architecture figcaption {
  margin-bottom: 20px;
  font-size: var(--ky-text-meta);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture-node {
  padding: 16px;
  background: var(--ky-surface);
  border: 1px solid var(--ky-border);
  border-radius: var(--ky-radius-inset);
}

.architecture-node strong,
.architecture-node span {
  display: block;
}

.architecture-node span {
  margin-top: 4px;
  color: var(--ky-muted);
  font-size: var(--ky-text-ui);
}

.architecture-connector {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  margin-block: 12px;
  color: var(--ky-muted);
  font: 500 var(--ky-text-meta)/1 var(--ky-font-mono);
}

.architecture-connector::before,
.architecture-connector::after {
  height: 1px;
  content: '';
  background: var(--ky-control-border);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.62fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 32px;
}

.section-heading h2,
.editorial-title {
  margin-bottom: 0;
  font: 500 var(--ky-text-section)/1.2 var(--ky-font-heading);
  letter-spacing: -0.02em;
}

.section-heading p {
  margin-bottom: 0;
  color: var(--ky-muted);
}

.route-grid,
.requirement-grid,
.step-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.route-card,
.requirement-card,
.section-panel {
  min-width: 0;
  padding: 28px;
  color: var(--ky-text);
  background: var(--ky-surface);
  border: 1px solid var(--ky-border);
  border-radius: var(--ky-radius-panel);
  text-decoration: none;
}

.route-card {
  position: relative;
  min-height: 290px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color var(--ky-motion-fast) var(--ky-ease), transform var(--ky-motion-fast) var(--ky-ease);
}

.route-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  content: '';
  background: var(--ky-accent-blue);
}

.route-card.agent::before {
  background: var(--ky-accent-green);
}

.route-card:hover {
  color: var(--ky-text);
  border-color: var(--ky-control-border);
  text-decoration: none;
  transform: translateY(-2px);
}

.route-number {
  color: var(--ky-muted);
  font: 400 var(--ky-text-code)/var(--ky-line-code) var(--ky-font-mono);
}

.route-card h3 {
  margin: auto 0 12px;
  font: 500 2rem/1.15 var(--ky-font-heading);
  letter-spacing: -0.02em;
}

.route-card p {
  max-width: 46ch;
  margin-bottom: 20px;
  color: var(--ky-muted);
}

.route-link {
  font-size: var(--ky-text-ui);
  font-weight: 600;
}

.section {
  margin-top: 96px;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-block: 1px solid var(--ky-border);
}

.principle {
  padding: 28px 24px;
}

.principle + .principle {
  border-left: 1px solid var(--ky-border);
}

.principle strong {
  display: block;
  margin-bottom: 8px;
}

.principle p {
  margin: 0;
  color: var(--ky-muted);
  font-size: var(--ky-text-ui);
}

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

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 30px;
  padding: 4px 10px;
  color: var(--ky-text);
  background: var(--ky-inset);
  border-radius: var(--ky-radius-badge);
  font-size: var(--ky-text-meta);
  font-weight: 600;
}

.status::before {
  width: 7px;
  height: 7px;
  content: '';
  background: var(--ky-muted);
  border-radius: 50%;
}

.status.required::before {
  background: var(--ky-info);
}

.status.recommended::before {
  background: var(--ky-success);
}

.status.optional::before {
  background: var(--ky-warning);
}

.prompt-panel {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 20px;
  color: var(--ky-text);
  background: var(--ky-surface);
  border: 1px solid var(--ky-border);
  border-radius: var(--ky-radius-panel);
}

.prompt-panel h2 {
  margin-bottom: 4px;
  font: 600 1.125rem/1.4 var(--ky-font-body);
}

.prompt-panel p {
  margin: 0;
  color: var(--ky-muted);
}

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

.requirement-card h3 {
  margin-block: 16px 8px;
  font: 600 1rem/1.4 var(--ky-font-body);
}

.requirement-card ul,
.section-panel ul {
  margin: 0;
  padding-left: 20px;
}

.requirement-card li + li,
.section-panel li + li {
  margin-top: 10px;
}

.requirement-card p,
.section-panel > p {
  color: var(--ky-muted);
}

.stage-list {
  counter-reset: stage;
  border-top: 1px solid var(--ky-border);
}

.stage-row {
  counter-increment: stage;
  display: grid;
  grid-template-columns: 64px minmax(180px, 0.55fr) minmax(0, 1fr);
  gap: 24px;
  padding-block: 24px;
  border-bottom: 1px solid var(--ky-border);
}

.stage-row::before {
  content: counter(stage, decimal-leading-zero);
  color: var(--ky-muted);
  font: 400 var(--ky-text-code)/var(--ky-line-code) var(--ky-font-mono);
}

.stage-row h3 {
  margin: 0;
  font: 600 1rem/1.4 var(--ky-font-body);
}

.stage-row p {
  margin: 0;
  color: var(--ky-muted);
}

.callout {
  padding: 16px;
  color: var(--ky-text);
  background: var(--ky-info-surface);
  border-left: 3px solid var(--ky-info);
  border-radius: 0 var(--ky-radius-inset) var(--ky-radius-inset) 0;
}

.callout.warning {
  background: var(--ky-warning-surface);
  border-color: var(--ky-warning);
}

.onboarding-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 24px;
}

.section-panel h2,
.section-panel h3 {
  font-family: var(--ky-font-body);
  font-weight: 600;
}

.section-panel h2 {
  font-size: 1.125rem;
}

.code-block {
  position: relative;
  min-width: 0;
  margin-block: 16px 24px;
}

pre,
code {
  font-family: var(--ky-font-mono);
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
  letter-spacing: 0;
}

code {
  font-size: 0.9em;
}

:not(pre) > code {
  padding: 0.12em 0.35em;
  background: var(--ky-inset);
  border-radius: 3px;
  overflow-wrap: anywhere;
}

pre {
  margin: 0;
  padding: 16px;
  overflow: auto;
  color: var(--ky-text);
  background: var(--ky-inset);
  border: 1px solid var(--ky-border);
  border-radius: var(--ky-radius-inset);
  font-size: var(--ky-text-code);
  line-height: var(--ky-line-code);
  tab-size: 2;
  white-space: pre;
}

.code-copy {
  position: absolute;
  z-index: 2;
  top: 8px;
  right: 8px;
  min-height: 32px;
  padding: 4px 10px;
  color: var(--ky-text);
  background: var(--ky-raised);
  border: 1px solid var(--ky-control-border);
  border-radius: var(--ky-radius-control);
  font-size: var(--ky-text-meta);
  font-weight: 600;
  cursor: pointer;
}

.code-copy:hover {
  background: var(--ky-hover);
}

.guide-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.guide-nav {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 2px;
  max-height: calc(100vh - 112px);
  overflow: auto;
}

.guide-nav strong {
  margin-bottom: 8px;
  font-size: var(--ky-text-meta);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guide-nav a {
  padding: 7px 9px;
  color: var(--ky-muted);
  border-radius: var(--ky-radius-control);
  font-size: var(--ky-text-meta);
  line-height: 1.35;
  text-decoration: none;
}

.guide-nav a:hover {
  color: var(--ky-text);
  background: var(--ky-hover);
}

.prose {
  min-width: 0;
  max-width: 780px;
}

.prose > h1 {
  margin-bottom: 16px;
  font: 500 clamp(2.5rem, 6vw, 3.75rem)/1.04 var(--ky-font-heading);
  letter-spacing: -0.03em;
}

.prose h2 {
  margin: 72px 0 20px;
  padding-top: 8px;
  font: 500 var(--ky-text-section)/1.2 var(--ky-font-heading);
  letter-spacing: -0.02em;
}

.prose h3 {
  margin: 40px 0 12px;
  font: 600 1rem/1.4 var(--ky-font-body);
}

.heading-link {
  margin-left: 8px;
  color: var(--ky-muted);
  font-family: var(--ky-font-body);
  font-size: 0.65em;
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
}

h1:hover .heading-link,
h2:hover .heading-link,
h3:hover .heading-link,
.heading-link:focus {
  opacity: 1;
}

.prose p,
.prose li {
  max-width: var(--ky-reading-width);
}

.prose ul,
.prose ol {
  padding-left: 24px;
}

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

.prose hr {
  margin-block: 56px;
  border: 0;
  border-top: 1px solid var(--ky-border);
}

.notice {
  display: block;
  margin-block: 24px;
  padding: 16px;
  color: var(--ky-text);
  background: var(--ky-warning-surface);
  border-left: 3px solid var(--ky-warning);
  border-radius: 0 var(--ky-radius-inset) var(--ky-radius-inset) 0;
}

.site-footer {
  border-top: 1px solid var(--ky-border);
}

.footer-inner {
  min-height: 112px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--ky-muted);
  font-size: var(--ky-text-ui);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.not-found {
  min-height: calc(100vh - 177px);
  display: grid;
  place-items: center;
  text-align: center;
}

.not-found h1 {
  margin-bottom: 12px;
  font: 500 4rem/1 var(--ky-font-heading);
}

@media (max-width: 900px) {
  .hero,
  .hero.compact,
  .section-heading,
  .onboarding-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 40px;
  }

  .architecture {
    max-width: 620px;
  }

  .requirement-grid,
  .principles {
    grid-template-columns: 1fr;
  }

  .principle + .principle {
    border-top: 1px solid var(--ky-border);
    border-left: 0;
  }

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

  .guide-nav {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: none;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--ky-border);
  }

  .guide-nav strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .header-inner,
  .content,
  .footer-inner {
    width: min(100% - 32px, 1180px);
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 4px 12px;
    padding-block: 8px;
  }

  .site-nav {
    width: 100%;
    order: 2;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: 0;
    overflow: visible;
  }

  .site-nav a,
  .theme-toggle {
    min-width: 0;
    justify-content: center;
    padding-inline: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .theme-toggle {
    width: 40px;
    justify-self: center;
    padding: 0;
  }

  .content {
    padding-block: 48px 72px;
  }

  .hero,
  .hero.compact {
    padding-block: 16px 48px;
  }

  .hero h1,
  .page-title {
    font-size: 2.9rem;
  }

  .route-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }

  .section {
    margin-top: 72px;
  }

  .prompt-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .prompt-panel .button {
    width: 100%;
  }

  .stage-row {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .stage-row p {
    grid-column: 2;
  }

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

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-block: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .route-card {
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .guide-nav,
  .code-copy,
  .button-row {
    display: none;
  }

  .content,
  .prose {
    width: 100%;
    max-width: none;
    padding: 0;
  }

  pre {
    white-space: pre-wrap;
  }
}