:root {
  color-scheme: light;
  --ink: #20252b;
  --muted: #5b6570;
  --line: #e0e5e9;
  --soft: #f4f6f8;
  --accent: #294f82;
  --page: #ffffff;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  line-height: 1.65;
}
a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}
a:hover {
  text-decoration-thickness: 2px;
}
button,
input {
  font: inherit;
}
button {
  cursor: pointer;
}
::selection {
  background: #dce8f6;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}
code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
code {
  font-size: 0.9em;
  overflow-wrap: anywhere;
}
p {
  margin: 0 0 1.2rem;
}
h1,
h2,
h3 {
  line-height: 1.14;
  font-weight: 650;
  letter-spacing: -0.035em;
}
h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(2.75rem, 6.5vw, 5.4rem);
}
h2 {
  margin: 0 0 1.2rem;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
}
h3 {
  margin: 0 0 0.65rem;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}
ul,
ol {
  padding-left: 1.3rem;
}
li + li {
  margin-top: 0.45rem;
}
section[id] {
  scroll-margin-top: 2rem;
}
.container {
  width: min(1080px, calc(100% - 3.5rem));
  margin-inline: auto;
}
.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: white;
  z-index: 10;
}
.skip-link:focus {
  top: 0.75rem;
}
.site-header {
  border-bottom: 1px solid var(--line);
}
.header-inner {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  color: var(--ink);
  text-decoration: none;
}
.brand-name {
  font-size: 1.45rem;
  font-weight: 750;
  letter-spacing: -0.065em;
}
.brand-caption {
  color: var(--muted);
  font-size: 0.875rem;
}
.navigation {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  font-size: 0.9rem;
}
.navigation a {
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.navigation a:hover,
.navigation a[aria-current="page"] {
  color: var(--ink);
}
.navigation a[aria-current="page"] {
  text-decoration: underline;
}
.navigation .nav-start {
  color: var(--ink);
}
.eyebrow {
  margin-bottom: 1.2rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.hero {
  padding-block: 5.8rem 4.6rem;
}
.hero h1 {
  max-width: 900px;
}
.hero .lede {
  max-width: 710px;
}
.lede {
  font-size: 1.2rem;
  color: var(--muted);
  line-height: 1.7;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.6rem;
  margin-top: 2rem;
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 0.7rem 1.25rem;
  border: 1px solid var(--ink);
  border-radius: 5px;
  background: var(--ink);
  color: white;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
}
.button:hover {
  background: #38424e;
  text-decoration: none;
}
.text-link {
  font-size: 0.95rem;
  font-weight: 500;
}
.hero-command {
  max-width: 680px;
  margin-top: 2.25rem;
}
.code-block {
  margin-block: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  overflow: hidden;
  background: var(--soft);
}
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}
.copy-button {
  padding: 0.15rem 0.45rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 3px;
  font-size: 0.875rem;
}
.copy-button:hover {
  background: #e5e9ee;
  color: var(--ink);
}
pre {
  margin: 0;
  padding: 1.15rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.75;
}
pre code {
  font-size: inherit;
  overflow-wrap: normal;
}
.code-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.1rem;
}
.code-inline code {
  min-width: 0;
  font-size: 0.875rem;
}
.section {
  padding-block: 3.8rem;
  border-top: 1px solid var(--line);
}
.section-heading {
  max-width: 650px;
  margin-bottom: 2rem;
}
.section-heading p {
  color: var(--muted);
}
.feature-case {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 4.5rem;
  align-items: start;
}
.feature-case p {
  max-width: 630px;
  color: var(--muted);
}
.case-note {
  font-size: 0.875rem;
}
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.stats dt {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.04em;
}
.stats dd {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}
.case-stats {
  grid-template-columns: 1fr;
  margin: 0;
  padding-left: 2rem;
  border-left: 1px solid var(--line);
}
.case-stats > div + div {
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
}
.case-stats dt {
  font-size: 1.7rem;
}
.workflows {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.8rem;
}
.workflows p {
  margin-bottom: 0.8rem;
  color: var(--muted);
}
.workflows a {
  font-size: 0.9rem;
}
.start-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}
.start-row h2 {
  margin-bottom: 0.65rem;
}
.start-row p {
  margin: 0;
  color: var(--muted);
}
.site-footer {
  margin-top: 1.5rem;
  padding-block: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
}
.footer-inner p {
  margin: 0;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer-links a {
  color: var(--muted);
}
.page-heading {
  padding-block: 4.3rem 2.7rem;
}
.page-heading h1 {
  max-width: 850px;
  font-size: clamp(2.6rem, 5.5vw, 4.25rem);
}
.page-heading .lede {
  max-width: 730px;
}
.breadcrumb {
  margin-bottom: 2rem;
  color: var(--muted);
  font-size: 0.875rem;
}
.breadcrumb a {
  color: var(--muted);
}
.page-meta {
  color: var(--muted);
  font-size: 0.875rem;
}
.article-layout {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 4rem;
  padding-bottom: 3.5rem;
}
.contents {
  align-self: start;
  position: sticky;
  top: 2rem;
  padding-top: 2.4rem;
  font-size: 0.875rem;
}
.contents p {
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.8rem;
}
.contents ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.contents li + li {
  margin-top: 0.75rem;
}
.contents a {
  color: var(--muted);
  text-decoration: none;
}
.contents a:hover {
  color: var(--ink);
  text-decoration: underline;
}
.article {
  max-width: 760px;
  min-width: 0;
}
.article-section {
  padding-block: 2.4rem;
  border-top: 1px solid var(--line);
}
.article-section h2 {
  font-size: 1.8rem;
}
.article p,
.article li {
  color: #414b55;
}
.article .stats {
  margin: 0 0 1.6rem;
}
.article .stats dt {
  color: var(--ink);
}
.article .stats dd {
  color: var(--muted);
}
.caption {
  font-size: 0.875rem;
  color: var(--muted);
}
.explanatory-figure {
  margin: 0;
}
.figure-viewport {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 5px;
}
.explanatory-figure img {
  display: block;
  width: 100%;
  min-width: 880px;
  height: auto;
}
.explanatory-figure figcaption {
  max-width: 800px;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.875rem;
}
.explanatory-figure figcaption a {
  white-space: nowrap;
}
.case-figure {
  margin-bottom: 3.2rem;
}
.step-selector {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.5rem;
  margin-block: 1.5rem 0.9rem;
}
.step-selector button {
  padding: 0.55rem 0.3rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--page);
  color: var(--muted);
  font-size: 0.85rem;
}
.step-selector button span {
  font-size: 0.75rem;
  margin-right: 0.3rem;
  font-variant-numeric: tabular-nums;
}
.step-selector button[aria-pressed="true"] {
  border-color: var(--accent);
  background: #edf2f8;
  color: var(--accent);
}
.code-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}
.code-comparison .code-block {
  margin: 0;
  min-width: 0;
}
.code-comparison .code-header {
  padding-inline: 0.8rem;
  font-size: 0.8rem;
}
.code-comparison pre {
  padding: 1rem 0.8rem;
  font-size: 0.75rem;
  line-height: 1.95;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.step-comparison .is-active {
  background: #dce8f6;
  color: #173a67;
  border-radius: 2px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.step-detail {
  margin-block: 1.1rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
}
.step-detail p {
  margin: 0;
  font-size: 0.9rem;
}
.evidence-details {
  margin-block: 1.5rem;
}
.evidence-details summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.95rem;
}
.evidence-details[open] summary {
  margin-bottom: 1.2rem;
}
.evidence-details h3 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
}
.evidence-table-wrap {
  overflow-x: auto;
  margin-block: 1rem;
}
.evidence-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.evidence-table caption {
  text-align: left;
  color: var(--muted);
  margin-bottom: 0.6rem;
}
.evidence-table th,
.evidence-table td {
  text-align: left;
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--line);
}
.rea-queries {
  margin-block: 1.5rem 1.8rem;
  padding: 0;
  list-style: none;
  counter-reset: query;
}
.rea-queries li {
  position: relative;
  padding: 1.2rem 0 1.2rem 2.4rem;
  border-top: 1px solid var(--line);
  counter-increment: query;
}
.rea-queries li + li {
  margin-top: 0;
}
.rea-queries li::before {
  content: counter(query, decimal-leading-zero);
  position: absolute;
  top: 1.2rem;
  left: 0;
  color: var(--muted);
  font-size: 0.875rem;
}
.rea-queries h4 {
  margin: 0 0 0.6rem;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
}
.rea-queries .query-call {
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: 0.875rem;
}
.rea-query-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-block: 0.9rem;
}
.rea-query-pair .code-block {
  margin: 0;
  min-width: 0;
}
.rea-query-pair .code-header {
  padding-inline: 0.8rem;
  font-size: 0.75rem;
}
.rea-query-pair pre {
  padding: 0.8rem;
  font-size: 0.75rem;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.rea-queries p:last-child {
  margin: 0;
  font-size: 0.9rem;
}
.numbered-notes {
  list-style: none;
  padding: 0;
  margin: 1.75rem 0 0;
  counter-reset: note;
}
.numbered-notes li {
  position: relative;
  padding-left: 2.4rem;
  counter-increment: note;
}
.numbered-notes li + li {
  margin-top: 1.7rem;
}
.numbered-notes li::before {
  content: counter(note, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  color: var(--muted);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}
.numbered-notes h3 {
  color: var(--ink);
}
.verification {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.7rem;
}
.verification h3 {
  font-size: 1.1rem;
}
.verification p {
  margin: 0;
}
.reading-list {
  list-style: none;
  padding: 0;
  margin-bottom: 0;
}
.reading-list li {
  padding-block: 1rem;
  border-top: 1px solid var(--line);
}
.reading-list span {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 0.2rem;
}
.requirements {
  margin-top: 1.5rem;
  padding-bottom: 0.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.prompt {
  margin: 1.2rem 0;
  padding: 1rem 1.2rem;
  background: var(--soft);
  border-left: 2px solid #97a6b7;
}
.prompt p {
  margin: 0;
}
.provider-list {
  margin-top: 1.5rem;
}
.provider {
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 1.3rem;
  padding-block: 1.2rem;
  border-top: 1px solid var(--line);
}
.provider h3 {
  font-size: 1rem;
  margin-top: 0.2rem;
}
.provider p {
  margin-bottom: 0.5rem;
}
.provider a {
  font-size: 0.9rem;
}
.small-heading {
  margin-top: 1.8rem;
}
.agent-terminal {
  margin-block: 1.5rem;
  overflow: hidden;
  border: 1px solid #303d4a;
  border-radius: 6px;
  background: #202933;
  color: #f1f4f8;
}
.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid #384551;
  color: #bdc8d4;
  font-size: 0.8rem;
}
.terminal-title {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.terminal-dots {
  display: flex;
  gap: 4px;
}
.terminal-dots i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #81909e;
}
.agent-terminal .copy-button {
  color: #d6dee7;
}
.agent-terminal .copy-button:hover {
  background: #384551;
  color: white;
}
.agent-terminal .terminal-prompt {
  margin: 0;
  padding: 1.4rem;
  color: #f1f4f8;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.9;
}
.prompt-symbol {
  color: #9bbfe5;
  margin-right: 0.65rem;
}
.terminal-cursor {
  display: inline-block;
  width: 0.5em;
  height: 1em;
  margin-left: 0.4em;
  vertical-align: -0.12em;
  background: #9bbfe5;
}
.agent-terminal.is-visible .terminal-cursor {
  animation: terminal-blink 1s step-end 6;
}
@keyframes terminal-blink {
  50% {
    opacity: 0;
  }
}
.workflow-figure {
  margin: 1.7rem 0;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1.4rem;
  background: #fafbfc;
}
.figure-title {
  margin: 0 0 1.3rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
}
.flow-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.9rem;
  padding: 0;
  margin: 0;
  list-style: none;
}
.flow-steps li {
  position: relative;
  margin: 0;
  min-width: 0;
}
.flow-steps li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -1.4rem;
  top: 2.1rem;
  color: #8191a2;
}
.flow-label {
  display: block;
  margin-bottom: 0.65rem;
  color: var(--muted);
  font-size: 0.75rem;
}
.flow-node {
  display: block;
  padding: 0.8rem;
  background: white;
  border: 1px solid #ced9e5;
  border-radius: 4px;
  color: var(--accent);
  font-size: 0.875rem;
  line-height: 1.5;
  font-weight: 500;
}
.flow-note {
  display: block;
  margin-top: 0.65rem;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
}
.flow-result {
  margin: 1.3rem 0 0;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--accent);
  background: #edf2f8;
  color: var(--ink);
  font-size: 0.9rem;
}
.workflow-figure figcaption {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.8rem;
}
.guide-index {
  padding-bottom: 3rem;
}
.guide-entry {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 2.5rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--line);
}
.guide-entry .eyebrow {
  margin: 0;
}
.guide-entry h2 {
  font-size: 1.75rem;
}
.guide-entry p {
  max-width: 660px;
  color: var(--muted);
}
.guide-route {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.guide-route span {
  padding: 0.2rem 0.55rem;
  background: var(--soft);
  border-radius: 3px;
  color: #414b55;
}
.example-files {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}
.example-files li + li {
  margin: 0;
}
.example-app {
  max-width: 720px;
  padding-block: 3.5rem;
}
.example-app h1 {
  font-size: 3rem;
}
.example-notes {
  padding: 0;
  list-style: none;
  margin-block: 2rem;
}
.example-notes li {
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--line);
}
.example-status {
  margin-block: 1.5rem 1rem;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 850px) {
  .brand-caption {
    display: none;
  }
  .feature-case {
    gap: 2.4rem;
  }
  .workflows {
    gap: 1.8rem;
  }
  .article-layout {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 2rem;
  }
  .code-comparison,
  .rea-query-pair {
    grid-template-columns: 1fr;
  }
  .flow-steps {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .flow-steps li:not(:last-child)::after {
    content: "↓";
    top: auto;
    bottom: -1.7rem;
    right: auto;
    left: 0.85rem;
  }
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 2.5rem);
  }
  .header-inner {
    min-height: 78px;
    gap: 1rem;
  }
  .navigation {
    gap: 1rem;
    font-size: 0.875rem;
  }
  .hero {
    padding-block: 3.5rem 3rem;
  }
  .hero h1 {
    font-size: clamp(2.55rem, 10vw, 3.75rem);
  }
  .lede {
    font-size: 1.075rem;
  }
  .actions {
    gap: 1.2rem;
  }
  .section {
    padding-block: 2.6rem;
  }
  .feature-case,
  .workflows,
  .verification {
    grid-template-columns: 1fr;
  }
  .case-stats {
    grid-template-columns: repeat(3, 1fr);
    border-left: 0;
    padding: 1.5rem 0 0;
    border-top: 1px solid var(--line);
    gap: 1rem;
  }
  .case-stats > div + div {
    border: 0;
    padding-top: 0;
  }
  .stats dt {
    font-size: 1.65rem;
  }
  .stats dd {
    font-size: 0.875rem;
  }
  .start-row {
    align-items: flex-start;
    flex-direction: column;
  }
  .page-heading {
    padding-block: 3rem 2rem;
  }
  .page-heading h1 {
    font-size: clamp(2.45rem, 9vw, 3.4rem);
  }
  .article-layout {
    display: block;
  }
  .contents {
    position: static;
    padding-top: 0;
    padding-bottom: 1.7rem;
  }
  .contents p {
    display: none;
  }
  .contents ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.3rem;
  }
  .contents li + li {
    margin: 0;
  }
  .article-section {
    padding-block: 2rem;
  }
  .article .stats {
    gap: 1rem;
  }
  .provider {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .guide-entry {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }
  .workflow-figure {
    padding: 1rem;
  }
  .step-selector {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  pre {
    padding: 1rem;
  }
  .code-inline {
    align-items: flex-start;
    padding: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .agent-terminal.is-visible .terminal-cursor {
    animation: none;
  }
}

@media (max-width: 360px) {
  .header-inner {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.3rem;
    padding-block: 0.65rem;
  }
  .navigation {
    width: 100%;
    justify-content: space-between;
  }
  .stats,
  .case-stats {
    grid-template-columns: 1fr;
  }
}