:root {
  --bg: #f4f1ea;
  --bg-2: #ebe6dc;
  --paper: #fffdf8;
  --ink: #2c2b28;
  --mute: #6f6b63;
  --line: #d8d2c6;
  --accent: #3f4a3c;
  --warn: #8a4b32;
  --serif: "Songti SC", "STSong", "Iowan Old Style", Palatino, "Noto Serif CJK SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: clip;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.seo-nav {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
}

.seo-nav nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

code {
  font-family: "SF Mono", Menlo, "Courier New", monospace;
  font-size: 0.92em;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  color: var(--mute);
  font-size: 13px;
  line-height: 1.5;
}

.skip {
  position: absolute;
  left: 16px;
  top: -40px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--bg);
}

.skip:focus {
  top: 12px;
}

.wrap {
  width: min(920px, calc(100% - 48px));
  margin: 0 auto;
}

.wrap-article {
  width: min(720px, calc(100% - 48px));
  margin: 0 auto;
}

.wrap-chrome {
  width: min(1080px, calc(100% - 48px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: env(safe-area-inset-top);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.site-header.is-scrolled {
  background: color-mix(in srgb, var(--bg) 94%, transparent);
}

.site-header .wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px 32px;
  min-height: 68px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  box-shadow: 0 0 0 1px var(--line);
  background: #fff;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px 4px;
  font-size: 14px;
}

.site-header nav a {
  padding: 6px 10px;
  text-decoration: none;
  color: var(--mute);
}

.site-header nav a:hover,
.site-header nav a:focus-visible {
  color: var(--ink);
}

.site-header nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -1px 0 var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  min-width: 44px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}

.lang {
  position: relative;
  justify-self: end;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}

.lang-btn::after {
  content: "";
  width: 5px;
  height: 5px;
  margin-top: -3px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
}

.lang.is-open .lang-btn::after {
  margin-top: 2px;
  transform: rotate(-135deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 30;
  min-width: 168px;
  max-height: min(360px, 70dvh);
  overflow: auto;
  margin: 0;
  padding: 6px 0;
  list-style: none;
  background: var(--paper);
  border: 1px solid var(--line);
}

.site-footer .lang-menu {
  top: auto;
  bottom: calc(100% + 6px);
}

.lang-menu a {
  display: block;
  padding: 7px 14px;
  text-decoration: none;
  color: var(--mute);
  font-size: 13px;
  line-height: 1.4;
}

.lang-menu a:hover,
.lang-menu a:focus-visible {
  color: var(--ink);
  background: var(--bg);
}

.lang-menu a[aria-current="true"] {
  color: var(--ink);
}

.btn,
.site-header a,
.lang-btn,
.lang-menu a,
.nav-toggle,
.site-footer a {
  outline-offset: 3px;
}

.btn:focus-visible,
.site-header a:focus-visible,
.lang-btn:focus-visible,
.lang-menu a:focus-visible,
.nav-toggle:focus-visible,
.site-footer a:focus-visible {
  outline: 2px solid var(--ink);
}

.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  padding: 28px 0 0;
  color: var(--mute);
  font-size: 13px;
}

.crumb a {
  color: var(--mute);
  text-decoration: none;
}

.crumb a:hover,
.crumb a:focus-visible {
  color: var(--ink);
}

.page-hero {
  padding: 40px 0 8px;
}

.crumb + .page-hero {
  padding-top: 16px;
}

.page-hero h1 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
}

.page-hero p {
  margin: 0;
  color: var(--mute);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 168px;
  gap: 56px;
  align-items: start;
  padding: 64px 0 48px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--mute);
  font-size: 13px;
}

.hero h1 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(30px, 4.5vw, 42px);
  line-height: 1.28;
}

.hero p {
  margin: 0 0 12px;
  color: var(--mute);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.shot {
  max-width: 168px;
}

.shot img,
.shot-block img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.shot-inline {
  float: right;
  width: 148px;
  margin: 4px 0 20px 32px;
}

.shot-block {
  max-width: 180px;
  margin: 8px 0 28px;
}

.toc {
  margin: 8px 0 8px;
  padding: 0;
  list-style: none;
}

.toc li {
  padding: 8px 0;
  border-top: 1px solid var(--line);
}

.toc a {
  text-decoration: none;
}

.toc a:hover {
  color: var(--mute);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  margin: 0 0 22px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 22px;
  font-size: 14px;
}

.table-scroll table {
  margin: 0;
}

.prose th,
.prose td {
  text-align: left;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.prose th {
  color: var(--mute);
  font-weight: 500;
}

.article-body {
  padding: 36px 0 56px;
}

.article-body .prose > h2:first-child {
  margin-top: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  font-size: 14px;
  touch-action: manipulation;
}

.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--bg-2);
  border-color: var(--ink);
  color: var(--ink);
}

.panel {
  margin: 0 0 8px;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 600;
}

.check {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check li {
  color: var(--mute);
  font-size: 14px;
}

.section {
  padding: 56px 0;
}

.section-alt {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(26px, 3.5vw, 32px);
}

.lead {
  margin: 0 0 28px;
  color: var(--mute);
  max-width: 40em;
}

.caps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 40px;
}

.caps h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.caps p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.download {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.store {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.store-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.app-icon {
  width: 48px;
  height: 48px;
  border-radius: 11px;
  background: #fff;
}

.store .label,
.catalog .label {
  margin: 0 0 2px;
  font-size: 12px;
  color: var(--mute);
}

.store h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.store > p {
  margin: 0 0 14px;
  color: var(--mute);
  font-size: 13px;
}

.store dl {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 8px 10px;
  margin: 0 0 18px;
  font-size: 13px;
}

.store dt {
  color: var(--mute);
}

.store dd {
  margin: 0;
}

.article-body .store {
  max-width: 320px;
  margin: 8px 0 8px;
}

.prose h2,
.pager {
  clear: both;
}

.prose h2 {
  scroll-margin-top: calc(80px + env(safe-area-inset-top));
  margin: 40px 0 10px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
}

.prose h3 {
  scroll-margin-top: calc(80px + env(safe-area-inset-top));
  margin: 22px 0 8px;
  font-size: 16px;
}

.prose p,
.prose li,
.prose a,
.prose code {
  overflow-wrap: anywhere;
}

.prose p {
  margin: 0 0 14px;
}

.prose ol,
.prose ul {
  margin: 0 0 18px;
  padding-left: 1.2em;
}

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

.hint {
  margin: 8px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--warn);
  font-size: 14px;
}

.prose .done {
  margin: 8px 0 28px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 14px;
}

.prose .note {
  margin: 0 0 14px;
  color: var(--warn);
  font-size: 14px;
}

.path {
  margin: 0;
  padding: 0;
  list-style: none;
}

.path li {
  display: grid;
  grid-template-columns: 2em minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.path li:last-child {
  border-bottom: 1px solid var(--line);
}

.path .num {
  color: var(--mute);
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
}

.path h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
}

.path p {
  margin: 0;
  color: #4a4843;
}

.path a.more,
.path .see {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
}

.path .mark {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--mute);
}

.wrap-doc {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
}

.doc {
  display: grid;
  grid-template-columns: 200px minmax(0, 680px);
  gap: 56px;
  align-items: start;
  padding: 8px 0 56px;
}

.doc-nav {
  position: sticky;
  top: calc(76px + env(safe-area-inset-top));
}

.doc-nav p {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--mute);
}

.doc-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.doc-nav a {
  display: block;
  padding: 5px 0 5px 10px;
  border-left: 2px solid transparent;
  color: var(--mute);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
}

.doc-nav a:hover,
.doc-nav a.is-active {
  color: var(--ink);
  border-left-color: var(--ink);
}

.catalog {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}

.catalog .card {
  padding: 18px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}

.catalog .card:hover h3 {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.catalog h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.catalog p:last-child {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.pager a {
  text-decoration: none;
  color: var(--mute);
}

.pager a:hover {
  color: var(--ink);
}

.pager span {
  display: block;
  margin-bottom: 2px;
  font-size: 12px;
}

.blog-status {
  margin: 12px 0 24px;
  color: var(--mute);
  font-size: 14px;
}

.blog-list {
  display: grid;
  margin: 12px 0 24px;
  padding: 0;
  list-style: none;
}

.blog-list a {
  display: block;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.blog-list li:last-child a {
  border-bottom: 1px solid var(--line);
}

.blog-list time {
  display: block;
  margin-bottom: 6px;
  color: var(--mute);
  font-size: 13px;
}

.blog-list h2 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
}

.blog-list p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.blog-list a:hover h2 {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.dl-card {
  margin: 40px 0 8px;
  padding: 22px 22px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.dl-card h2 {
  margin: 0;
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 600;
}

.dl-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.dl-card .label {
  margin: 0 0 2px;
  font-size: 12px;
  color: var(--mute);
}

.dl-card .hero-actions {
  margin-top: 16px;
}

.dl-float {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
  width: 148px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.dl-float-main {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 12px 10px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.dl-float-main img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: 0 0 0 1px var(--line);
  background: #fff;
}

.dl-float-sub {
  display: block;
  padding: 8px 12px 10px;
  border-top: 1px solid var(--line);
  color: var(--mute);
  text-decoration: none;
  font-size: 12px;
}

.dl-float-main:hover,
.dl-float-sub:hover {
  color: var(--ink);
}

.faq {
  display: grid;
  gap: 22px;
}

.faq article h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.faq article p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.site-footer {
  margin-top: 48px;
  padding: 28px 0 calc(36px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 13px;
  line-height: 1.65;
}

.site-footer .wrap {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-mark {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin: 0;
}

.footer-mark a {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
}

.footer-nav a {
  text-decoration: none;
  color: var(--mute);
}

.footer-nav a:hover,
.footer-nav a:focus-visible,
.footer-nav a[aria-current="page"] {
  color: var(--ink);
}

.footer-sep {
  display: inline-block;
  width: 1px;
  height: 11px;
  background: var(--line);
}

.footer-bottom {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px 24px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  margin: 0;
  max-width: 46em;
  font-size: 12px;
  overflow-wrap: anywhere;
}

.footer-langs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 0;
}

.footer-langs a {
  color: var(--mute);
  text-decoration: none;
  white-space: nowrap;
}

.footer-langs a:hover,
.footer-langs a:focus-visible,
.footer-langs a[aria-current="true"] {
  color: var(--ink);
}

@media (max-width: 900px) {
  .doc {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .doc-nav {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
    margin-bottom: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
  }

  .doc-nav p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 800px) {
  .hero,
  .caps,
  .download,
  .catalog,
  .check {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 28px;
    padding: 40px 0 32px;
  }

  .shot {
    max-width: 200px;
  }

  .shot-inline {
    float: none;
    width: 148px;
    margin: 0 0 20px;
  }

  .site-header .wrap {
    grid-template-columns: 1fr auto auto;
    min-height: 52px;
    padding: 8px 0;
    gap: 8px 10px;
  }

  .site-header.is-nav-open .wrap {
    grid-template-columns: 1fr auto;
  }

  .site-header.is-nav-open .lang {
    display: none;
  }

  .logo {
    min-width: 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-header nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 0;
    padding: 6px 0 10px;
    border-top: 1px solid var(--line);
    font-size: 16px;
  }

  .site-header.is-nav-open nav {
    display: flex;
  }

  .site-header nav a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 2px;
  }

  .site-header nav a[aria-current="page"] {
    box-shadow: none;
    font-weight: 600;
  }

  .lang-btn {
    min-height: 36px;
    min-width: 44px;
  }

  .footer-bottom {
    flex-wrap: wrap;
  }

  .footer-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
  }

  .site-footer .lang-menu {
    right: 0;
    left: auto;
  }

  .article-body .store {
    max-width: none;
  }

  .prose h2 {
    font-size: 20px;
  }
}

@media (max-width: 640px) {
  .wrap,
  .wrap-article,
  .wrap-doc,
  .wrap-chrome {
    width: calc(100% - 32px);
  }

  .page-hero {
    padding: 28px 0 8px;
  }

  .page-hero h1,
  .hero h1 {
    font-size: clamp(26px, 8vw, 34px);
  }

  .hero,
  .section,
  .article-body {
    padding-top: 32px;
    padding-bottom: 32px;
  }

  .section h2 {
    font-size: clamp(22px, 7vw, 28px);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    margin-top: 20px;
  }

  .hero-actions .btn {
    width: 100%;
    min-height: 44px;
  }

  .store .btn,
  .dl-card .btn {
    min-height: 44px;
  }

  .doc-nav a {
    min-height: 40px;
    display: flex;
    align-items: center;
    padding: 8px 0 8px 10px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-langs {
    align-self: flex-start;
  }

  .blog-list a {
    padding: 20px 0;
  }

  .blog-list h2 {
    font-size: 20px;
  }

  .dl-card {
    padding: 18px 16px 16px;
  }

  .dl-float {
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    display: flex;
    align-items: stretch;
    padding-bottom: env(safe-area-inset-bottom);
  }

  .dl-float-main {
    flex: 1;
    padding: 12px 14px;
  }

  .dl-float-sub {
    display: flex;
    align-items: center;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 12px 16px;
    white-space: nowrap;
  }

  body.has-dl-float {
    padding-bottom: calc(64px + env(safe-area-inset-bottom));
  }

  body.has-dl-float .site-footer {
    padding-bottom: 28px;
  }
}

@media (max-width: 380px) {
  .wrap,
  .wrap-article,
  .wrap-doc,
  .wrap-chrome {
    width: calc(100% - 24px);
  }

  .logo-name {
    display: none;
  }

  .lang-btn {
    padding-left: 8px;
    padding-right: 8px;
  }
}

@media (hover: none) {
  .site-header nav a:hover {
    color: var(--mute);
  }

  .site-header nav a[aria-current="page"]:hover,
  .footer-nav a:hover,
  .footer-nav a:focus-visible {
    color: var(--ink);
  }
}

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