:root {
  --blue-dark: #0050a0;
  --blue-light: #dce4f5;
  --orange-dark: #eb5d0b;
  --prompt-text: #4a4a49;
  --red-dark: #e30613;
  --red-light: #fde5da;
  --green-dark: #3d6315;
  --green-light: #ecf3da;
  --text: #000000;
  --surface: #ffffff;
  --border: #d6d9dd;
  --muted: #5d6268;
  --nav-background: #181d17;
  --nav-text: #f5f5f5;

  font-family: "Heebo", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: .5rem;
  inset-inline-start: .5rem;
  z-index: 1000;
  padding: .65rem .9rem;
  border-radius: .4rem;
  background: var(--surface);
  color: var(--blue-dark);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-200%);
}

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

img {
  max-width: 100%;
}

.container {
  width: min(100% - 2rem, 980px);
  margin-inline: auto;
}

.site-header {
  background: var(--surface);
}

.site-banner {
  width: 100%;
  background: var(--nav-background);
  overflow: hidden;
}

.site-banner img {
  display: block;
  width: min(100%, 1400px);
  height: auto;
  aspect-ratio: 2800 / 640;
  object-fit: contain;
  margin-inline: auto;
}

.site-header-bar {
  border-block-end: 1.5px solid var(--orange-dark);
  background: var(--nav-background);
}

.site-header-bar .container {
  padding-block: .85rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: .65rem;
}

.header-home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 2rem;
  block-size: 2rem;
  color: var(--nav-text);
  text-decoration: none;
  border-radius: .35rem;
}

.header-home-link:hover,
.header-home-link:focus-visible {
  color: var(--nav-text);
  background: rgba(255, 255, 255, .12);
}

.home-icon {
  inline-size: 1.35rem;
  block-size: 1.35rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand {
  color: var(--nav-text);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 750;
  text-decoration: none;
}

.brand:hover,
.brand:focus-visible {
  color: var(--nav-text);
  text-decoration: underline;
  text-decoration-color: var(--orange-dark);
  text-decoration-thickness: 2px;
  text-underline-offset: .22em;
}

.hero,
.page-heading {
  padding-block: clamp(1.6rem, 4vw, 2.8rem) 1.5rem;
}

.hero {
  text-align: center;
}

.book-subtitle {
  margin-block: -.2rem .35rem;
  color: var(--orange-dark);
  font-size: clamp(1.3rem, 2.8vw, 1.7rem);
  font-weight: 700;
}

.book-author {
  margin-block: 0 .45rem;
  color: var(--prompt-text);
  font-size: clamp(.95rem, 1.8vw, 1.05rem);
  font-weight: 600;
}

.book-slogan {
  margin-block: 0 1.5rem;
  color: var(--blue-dark);
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 600;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.25;
  margin-block: 1.35em .55em;
}

h1,
h2,
h4,
h6 {
  color: var(--blue-dark);
}

h3,
h5 {
  color: var(--red-dark);
}

h1 {
  margin-block-start: 0;
  font-size: clamp(1.85rem, 4vw, 2.6rem);
}

h2 {
  font-size: clamp(1.45rem, 3vw, 1.9rem);
}

h3 {
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
}

.language-list,
.language-home-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

.language-home-nav {
  justify-content: center;
}

.language-home-nav {
  justify-content: center;
  gap: 1rem;
}

.language-home-nav .card-link {
  min-inline-size: 12rem;
  text-align: center;
}

.card-link {
  display: inline-block;
  border: 2px solid var(--blue-dark);
  border-radius: .65rem;
  padding: .7rem 1rem;
  color: var(--blue-dark);
  font-weight: 700;
  text-decoration: none;
  background: var(--surface);
}

.card-link:hover,
.card-link:focus-visible {
  background: var(--blue-light);
}

.toc {
  border: 1px solid color-mix(in srgb, var(--blue-dark) 30%, white);
  border-inline-start: 5px solid var(--blue-dark);
  border-radius: .65rem;
  padding: 1rem 1.25rem;
  margin-block-end: 2rem;
  background: #f8fbff;
}

.toc ul {
  margin: 0;
  padding-inline-start: 1.4rem;
}

.book-section {
  padding-block: 1.5rem 2.5rem;
  border-block-end: 1px solid var(--border);
  scroll-margin-block-start: 1rem;
}

.book-section:last-of-type {
  border-block-end: 0;
}

.content-group {
  margin-block-start: 1.5rem;
}

.content-group > h3:first-child {
  margin-block-start: 0;
}

.prompt-item {
  margin-block: 1.25rem;
}

.prompt-title {
  margin-block: 0 .5rem;
}

.prompt-card {
  position: relative;
  border: 1px solid color-mix(in srgb, var(--blue-dark) 28%, white);
  border-radius: .7rem;
  padding: 1rem;
  background: var(--blue-light);
  color: var(--prompt-text);
}

.copy-button {
  float: inline-end;
  margin-inline-start: 1rem;
  margin-block-end: .5rem;
  border: 0;
  border-radius: .45rem;
  padding: .45rem .8rem;
  cursor: pointer;
  background: var(--blue-dark);
  color: #ffffff;
  font: inherit;
  font-weight: 700;
}

.copy-button:hover,
.copy-button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--orange-dark) 45%, transparent);
  outline-offset: 2px;
}

pre {
  clear: both;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--blue-light);
  border-radius: .5rem;
  padding: 1rem;
  direction: inherit;
  text-align: start;
  color: var(--prompt-text);
}

.prompt-card pre {
  margin-block-end: 0;
  padding: .2rem 0 0;
  background: transparent;
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

.links-group {
  padding: 1rem 1.2rem;
  border: 1px solid color-mix(in srgb, var(--green-dark) 30%, white);
  border-inline-start: 5px solid var(--green-dark);
  border-radius: .7rem;
  background: var(--green-light);
}

.links-group > h3:first-child {
  color: var(--red-dark);
}

.links-group h4,
.links-group h5,
.links-group h6 {
  color: var(--green-dark);
}

.links-group ul {
  margin-block-end: 0;
}

.markdown-body a,
.downloads a,
.toc a,
.back-to-toc a {
  color: var(--blue-dark);
  overflow-wrap: anywhere;
  text-underline-offset: .18em;
}

.markdown-body a:hover,
.markdown-body a:focus-visible,
.downloads a:hover,
.downloads a:focus-visible,
.toc a:hover,
.toc a:focus-visible,
.back-to-toc a:hover,
.back-to-toc a:focus-visible {
  color: var(--red-dark);
}

ul {
  list-style-type: square;
}

ul > li::marker {
  color: var(--orange-dark);
}

.external-link {
  display: inline;
}

.new-tab-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 1.5rem;
  min-block-size: 1.5rem;
  padding: .15rem;
  margin-inline-start: .38em;
  border-radius: .2em;
  color: var(--blue-dark);
  vertical-align: -0.18em;
  text-decoration: none;
}

.new-tab-link:hover,
.new-tab-link:focus-visible {
  background: rgba(0, 80, 160, .10);
  color: var(--red-dark);
}

.new-tab-icon {
  width: 1em;
  height: 1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.content-group ul,
.downloads {
  padding-inline-start: 1.4rem;
}

.back-to-toc {
  display: flex;
  justify-content: flex-end;
  margin-block-start: 2rem;
  font-size: .95rem;
}

.back-to-toc a {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  line-height: 1;
  font-weight: 650;
  text-decoration: none;
}

.back-to-toc a span {
  display: block;
  line-height: 1.2;
}

.toc-list-icon {
  width: 1.1em;
  height: 1.1em;
  display: block;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

:focus-visible {
  outline: 3px solid var(--orange-dark);
  outline-offset: 3px;
}


.site-footer {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 100;
  border-block-start: 1.5px solid var(--orange-dark);
  background: #f7f8fa;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, .06);
}

.has-fixed-footer {
  padding-block-end: calc(var(--fixed-footer-height, 4.5rem) + 1rem);
}

.site-footer-links-row,
.site-footer-copyright-row {
  min-block-size: 2.8rem;
}

.site-footer-links-row .container,
.site-footer-copyright-row .container {
  min-block-size: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: .45rem;
}


.site-copyright {
  margin: 0;
  color: #6b6b6b;
  font-size: .86rem;
  font-weight: 400;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: .55rem 1.1rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: var(--blue-dark);
  font-size: .9rem;
  font-weight: 600;
  text-decoration: none;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--red-dark);
  text-decoration: underline;
  text-underline-offset: .18em;
}

.footer-link svg {
  width: 1.15em;
  height: 1.15em;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.footer-icon {
  inline-size: 1.15em;
  block-size: 1.15em;
  flex: 0 0 auto;
  object-fit: contain;
}

.footer-icon--kita {
  border-radius: 50%;
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 1.2rem, 980px);
  }

  .site-header-bar .container {
    padding-block: .65rem;
  }

  .hero,
  .page-heading {
    padding-block-start: 1.35rem;
  }

  .toc,
  .links-group,
  .prompt-card {
    padding-inline: .85rem;
  }

  .copy-button {
    float: none;
    display: block;
    margin-inline-start: 0;
    margin-block-end: .8rem;
  }

  .language-list,
  .language-home-nav {
    display: grid;
    grid-template-columns: 1fr;
  }

  .card-link {
    text-align: center;
  }
}

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

.info-page {
  padding-block: clamp(1.6rem, 4vw, 2.8rem);
}

.prompt-service-actions {
  clear: both;
  margin-block-start: 1rem;
  padding-block-start: .85rem;
  border-block-start: 1px solid color-mix(in srgb, var(--blue-dark) 22%, white);
}

.prompt-service-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem .8rem;
}

.prompt-service-label {
  font-weight: 650;
  color: var(--prompt-text);
}

.prompt-service-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.ai-service-button,
.ai-service-confirm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .32rem;
  min-block-size: 2rem;
  border: 1px solid color-mix(in srgb, var(--blue-dark) 48%, white);
  border-radius: .4rem;
  padding: .28rem .52rem;
  background: var(--surface);
  color: var(--blue-dark);
  font: inherit;
  font-size: .9rem;
  font-weight: 650;
  cursor: pointer;
}

.ai-service-button:hover,
.ai-service-button:focus-visible,
.ai-service-confirm:hover,
.ai-service-confirm:focus-visible {
  background: color-mix(in srgb, var(--blue-light) 72%, white);
}

.ai-service-icon {
  inline-size: 1rem;
  block-size: 1rem;
  flex: 0 0 auto;
  object-fit: contain;
}

.ai-service-notice {
  margin-block-start: .8rem;
  padding: .8rem .9rem;
  border: 1px solid color-mix(in srgb, var(--orange-dark) 38%, white);
  border-radius: .55rem;
  background: color-mix(in srgb, var(--surface) 78%, var(--blue-light));
}

.ai-service-notice[hidden] {
  display: none;
}

.ai-service-notice p {
  margin: 0;
}

.ai-service-notice-text strong {
  color: var(--blue-dark);
  font-weight: 750;
}

.ai-service-notice-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .65rem 1rem;
  margin-block-start: .7rem;
}

.ai-service-skip-label {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  cursor: pointer;
}

.ai-service-skip-label input {
  inline-size: 1rem;
  block-size: 1rem;
  accent-color: var(--blue-dark);
}

.ai-service-confirm {
  background: var(--blue-dark);
  color: #ffffff;
  border-color: var(--blue-dark);
}

.ai-service-confirm:hover,
.ai-service-confirm:focus-visible {
  background: color-mix(in srgb, var(--blue-dark) 88%, black);
}

@media (max-width: 640px) {
  .prompt-service-row {
    align-items: stretch;
  }

  .prompt-service-label {
    flex-basis: 100%;
  }

  .prompt-service-buttons {
    width: 100%;
  }

  .ai-service-button {
    flex: 1 1 calc(50% - .45rem);
  }

  .ai-service-notice-controls {
    align-items: stretch;
  }

  .ai-service-skip-label,
  .ai-service-confirm {
    width: 100%;
  }
}

.info-content ol,
.info-content ul {
  padding-inline-start: 1.6rem;
}

.info-empty-message {
  color: var(--muted);
}