:root {
  color-scheme: light;
  --paper: #f7f6f0;
  --ink: #17201f;
  --muted: #59635f;
  --line: #d8d7d0;
  --accent: #b83d25;
  --accent-bright: #f25736;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  color: var(--accent);
}
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
  border-radius: 3px;
}
img {
  max-width: 100%;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1,
h2,
h3 {
  text-wrap: balance;
}
p {
  line-height: 1.8;
}
.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 2;
  background: var(--ink);
  color: white;
  padding: 12px 18px;
}
.skip-link:focus {
  top: 12px;
}
.site-header {
  max-width: 1240px;
  margin: auto;
  padding: 26px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 650;
  white-space: nowrap;
}
.site-header nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 15px;
  color: var(--muted);
}
.site-header [aria-current] {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 8px;
  text-decoration-color: var(--accent-bright);
}
.index-main {
  max-width: 1240px;
  margin: auto;
  padding: 0 40px 80px;
}
.blog-intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: end;
  padding: 68px 0 58px;
}
.blog-intro h1 {
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.25;
  letter-spacing: -0.03em;
  font-weight: 650;
}
.blog-intro p {
  font-size: 17px;
  color: var(--muted);
  max-width: 460px;
}
.text-link {
  display: inline-block;
  margin-top: 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 5px;
}
.text-link span {
  margin-left: 8px;
}
.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  align-items: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
  font-size: 15px;
}
.topic-nav a {
  padding: 4px 0;
}
.topic-nav span {
  margin-left: auto;
  color: var(--muted);
  font-size: 14px;
}
.featured {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 56px;
  margin-top: 38px;
  padding: 34px 38px;
  background: #eeece4;
}
.featured h2 {
  font-size: 28px;
  letter-spacing: -0.035em;
  line-height: 1.4;
}
.featured p {
  font-size: 16px;
  color: var(--muted);
  margin-top: 12px;
  max-width: 570px;
}
.featured ol {
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: stage;
  display: grid;
  align-content: center;
  gap: 16px;
}
.featured li {
  counter-increment: stage;
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 16px;
}
.featured li:before {
  content: counter(stage);
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-size: 14px;
}
.article-section {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 50px;
  padding-top: 66px;
  scroll-margin-top: 30px;
}
.section-heading h2 {
  font-size: 25px;
  line-height: 1.4;
  letter-spacing: -0.03em;
}
.section-heading p {
  margin-top: 12px;
  font-size: 15px;
  color: var(--muted);
  max-width: 210px;
}
.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.article-row {
  display: flex;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 24px 0;
}
.article-row:last-child {
  border-bottom: 1px solid var(--line);
}
.article-row h3 {
  font-size: 20px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: -0.025em;
}
.article-row p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin-top: 8px;
  max-width: 650px;
}
.read-link {
  white-space: nowrap;
  font-size: 14px;
  color: var(--accent);
  padding: 10px 0;
}
.read-link span {
  margin-left: 6px;
}
.tool-invite {
  margin-top: 72px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}
.tool-invite h2 {
  font-size: 26px;
}
.tool-invite p {
  margin-top: 12px;
  font-size: 16px;
  color: var(--muted);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 24px;
  background: var(--ink);
  color: white;
  border-radius: 999px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
}
.button:hover {
  background: #303c38;
  color: white;
}
.site-footer {
  background: #ebe9e2;
  border-top: 1px solid var(--line);
  padding: 36px max(40px, calc((100vw - 1160px) /2));
  display: grid;
  gap: 22px;
}
.footer-brand {
  font-size: 16px;
  font-weight: 600;
}
.site-footer p {
  font-size: 14px;
  color: var(--muted);
  margin-top: 5px;
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}
.site-footer .filing {
  font-size: 12px;
}
.article-main {
  max-width: 1180px;
  margin: auto;
  padding: 28px 40px 80px;
}
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
}
.article-header {
  margin: 36px 0 48px 246px;
  max-width: 740px;
}
.article-header h1 {
  font-size: clamp(30px, 3.2vw, 43px);
  line-height: 1.4;
  letter-spacing: -0.03em;
  font-weight: 650;
}
.article-description {
  margin-top: 22px;
  font-size: 18px;
  color: var(--muted);
  line-height: 1.8;
}
.article-meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 22px;
}
.reading-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 740px);
  gap: 36px;
}
.reading-layout > aside {
  align-self: start;
  position: sticky;
  top: 28px;
}
.contents {
  font-size: 14px;
  line-height: 1.8;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}
.contents summary {
  cursor: pointer;
  font-weight: 600;
}
.contents ol {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.contents a {
  display: block;
  color: var(--muted);
  padding: 3px 0;
}
.contents a:hover {
  color: var(--accent);
}
.prose {
  font-size: 17px;
  line-height: 1.95;
  min-width: 0;
}
.prose > p {
  margin-bottom: 24px;
}
.prose h2 {
  font-size: 26px;
  line-height: 1.5;
  margin: 48px 0 16px;
  letter-spacing: -0.025em;
  scroll-margin-top: 28px;
}
.prose h2:first-child {
  margin-top: 0;
}
.prose h3 {
  font-size: 21px;
  margin: 32px 0 12px;
  line-height: 1.5;
}
.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  overflow-wrap: anywhere;
}
.prose li {
  margin-bottom: 10px;
}
.prose ul,
.prose ol {
  padding-left: 1.4em;
  margin: 18px 0 26px;
}
.prose code {
  font-size: 0.9em;
  background: #eeece4;
  padding: 2px 5px;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
.prose pre {
  overflow: auto;
  background: #eeece4;
  padding: 22px;
  font-size: 14px;
  line-height: 1.8;
  border-radius: 10px;
}
.prose pre code {
  padding: 0;
  background: none;
}
.note {
  padding: 22px 24px;
  background: #eeece4;
  margin: 28px 0;
  font-size: 16px;
}
.note p + p {
  margin-top: 12px;
}
.table-wrap {
  overflow: auto;
  margin: 26px 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.7;
}
th,
td {
  border-bottom: 1px solid var(--line);
  padding: 14px 16px 14px 0;
  text-align: left;
  vertical-align: top;
  min-width: 100px;
}
th {
  font-weight: 600;
}
.related-articles {
  border-top: 1px solid var(--line);
  margin-top: 52px;
  padding-top: 12px;
}
.related-articles h2 {
  margin-top: 22px;
}
.article-cta {
  background: #eeece4;
  padding: 28px 32px;
  margin-top: 40px;
}
.article-cta h2 {
  font-size: 24px;
  margin: 0 0 12px;
}
.article-cta p {
  font-size: 16px;
  color: var(--muted);
}
.article-cta .button {
  color: white;
  text-decoration: none;
}
.source-note {
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 36px;
}
.not-found {
  max-width: 740px;
  margin: 14vh auto;
  padding: 30px;
}
.not-found h1 {
  margin-bottom: 20px;
  font-size: 32px;
}
@media (max-width: 900px) {
  .blog-intro {
    gap: 32px;
  }
  .article-section {
    grid-template-columns: 200px 1fr;
    gap: 30px;
  }
  .article-header {
    margin-left: 0;
  }
  .reading-layout {
    grid-template-columns: 1fr;
  }
  .reading-layout > aside {
    position: static;
    max-width: 740px;
  }
  .contents {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px 20px;
  }
  .contents ol {
    grid-template-columns: 1fr 1fr;
    column-gap: 24px;
  }
  .prose {
    max-width: 740px;
  }
  .article-main {
    max-width: 820px;
  }
}
@media (max-width: 600px) {
  .site-header {
    padding: 20px;
    gap: 16px;
  }
  .brand {
    font-size: 15px;
    gap: 7px;
  }
  .brand img {
    width: 30px;
    height: 30px;
  }
  .site-header nav {
    gap: 16px;
    font-size: 14px;
  }
  .index-main {
    padding: 0 22px 52px;
  }
  .blog-intro {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 38px 0 32px;
  }
  .blog-intro h1 {
    font-size: 35px;
  }
  .blog-intro p {
    font-size: 16px;
  }
  .topic-nav {
    gap: 10px 18px;
    font-size: 14px;
    padding: 15px 0;
  }
  .topic-nav span {
    width: 100%;
    margin-left: 0;
    font-size: 12px;
  }
  .featured {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 26px 24px;
    margin-top: 28px;
  }
  .featured h2 {
    font-size: 25px;
  }
  .featured ol {
    gap: 12px;
  }
  .article-section {
    grid-template-columns: 1fr;
    gap: 22px;
    padding-top: 44px;
  }
  .section-heading p {
    max-width: none;
    margin-top: 8px;
  }
  .article-row {
    gap: 12px;
    align-items: flex-start;
    padding: 22px 0;
  }
  .article-row h3 {
    font-size: 19px;
  }
  .article-row p {
    font-size: 14px;
  }
  .read-link {
    font-size: 13px;
    padding-top: 4px;
  }
  .tool-invite {
    margin-top: 48px;
  }
  .tool-invite h2 {
    font-size: 23px;
  }
  .site-footer {
    padding: 30px 22px;
  }
  .site-footer nav {
    gap: 14px 22px;
  }
  .article-main {
    padding: 16px 22px 52px;
  }
  .article-header {
    margin: 28px 0 30px;
  }
  .article-header h1 {
    font-size: 30px;
    line-height: 1.45;
  }
  .article-description {
    font-size: 16px;
    margin-top: 18px;
  }
  .article-meta {
    font-size: 12px;
    margin-top: 18px;
  }
  .reading-layout {
    gap: 30px;
  }
  .contents ol {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .prose {
    font-size: 16px;
    line-height: 1.95;
  }
  .prose h2 {
    font-size: 24px;
    margin-top: 38px;
  }
  .prose h3 {
    font-size: 20px;
  }
  .note {
    padding: 18px 20px;
    font-size: 15px;
  }
  .article-cta {
    padding: 24px;
  }
  .article-cta h2 {
    font-size: 22px;
  }
  .prose pre {
    font-size: 12px;
    padding: 16px;
  }
  .button {
    min-height: 48px;
  }
  .breadcrumbs {
    font-size: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
@media print {
  .site-header,
  .site-footer,
  .reading-layout > aside,
  .article-cta,
  .related-articles {
    display: none;
  }
  .article-main {
    max-width: none;
    padding: 0;
  }
  .article-header {
    margin: 0 0 30px;
  }
  .reading-layout {
    display: block;
  }
  .prose {
    max-width: none;
  }
  body {
    background: white;
    color: black;
  }
}