:root {
  --bg: #ffffff;
  --panel: #f6f7f9;
  --panel-2: #eef0f4;
  --line: #e4e7ec;
  --line-strong: #d6dae1;
  --accent: #1e6bff;
  --accent-dark: #1552d6;
  --accent-line: #b9cdff;
  --text: #0d0f14;
  --muted: #5d6470;
  --faint: #9aa1ac;
  --on-accent: #ffffff;
  --success: #1f9d5b;
  --warn: #b7791f;
  --error: #d14343;
  --veil: rgba(13, 15, 20, .18);
  --shadow-pop: 0 14px 36px rgba(13, 15, 20, .08), 0 2px 6px rgba(13, 15, 20, .04);
  --font-display: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --fs-body: 15px;
  --fs-small: 13px;
  --fs-label: 12px;
  --fs-nav: 14.5px;
  --fs-h1: clamp(34px, 3.2vw, 48px);
  --fs-hero: clamp(30px, 3.2vw, 48px);
  --fs-h2: clamp(24px, 2.8vw, 36px);
  --fs-h3: 21px;
  --weight-normal: 400;
  --weight-medium: 500;
  --tracking-title: -.03em;
  --tracking-cjk: -.02em;
  --r-pill: 999px;
  --r-panel: 20px;
  --r-card: 12px;
  --r-shot: 8px;
  --r-sm: 6px;
  --r-logo: 9px;
  --r-mark: 1.5px;
  --r-round: 50%;
  --wrap: 1232px;
  --head-width: 1280px;
  --reading: 780px;
  --gutter: 32px;
  --nav-h: 68px;
  --section-space: 140px;
  --card-pad: 28px;
  --tap: 44px;
  --ease: 150ms ease;
  --reveal-time: 420ms;
}
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
}
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button, summary { -webkit-tap-highlight-color: var(--panel-2); }
button { cursor: pointer; }
img { max-width: 100%; height: auto; }
svg { flex-shrink: 0; }
button svg, a svg { width: 18px; height: 18px; }
button:disabled { cursor: not-allowed; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}
::selection { background: var(--accent); color: var(--on-accent); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  line-height: 1.2;
  letter-spacing: var(--tracking-title);
  text-wrap: balance;
}
:lang(zh-CN) h1, :lang(zh-CN) h2, :lang(zh-CN) h3,
:lang(zh-TW) h1, :lang(zh-TW) h2, :lang(zh-TW) h3,
:lang(ja) h1, :lang(ja) h2, :lang(ja) h3,
:lang(ko) h1, :lang(ko) h2, :lang(ko) h3 { letter-spacing: var(--tracking-cjk); }
h1 { font-size: var(--fs-h1); line-height: 1.14; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
p, li, dd { overflow-wrap: break-word; }
strong { font-weight: var(--weight-medium); }
code, pre, kbd, samp { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  margin: 24px 0;
  padding: 20px;
  overflow-x: auto;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  font-size: var(--fs-small);
  line-height: 1.9;
  tab-size: 2;
}
pre code { overflow-wrap: normal; word-break: normal; white-space: pre; }
hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0; }
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: var(--reading); margin-inline: auto; }
.wrap.reading { max-width: calc(var(--reading) + var(--gutter) * 2); }
.grid, .hero-head, .head-row, .footer-grid, .card-grid, .two-col { min-width: 0; }
.grid > *, .hero-head > *, .head-row > *, .footer-grid > *, .card-grid > *, .two-col > * { min-width: 0; }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section + .section { padding-top: 0; }
.section-inner { border-top: 1px solid var(--line); padding-top: 36px; }
.section-title { margin: 14px 0 0; }
.section-lede { max-width: 640px; margin: 12px 0 32px; color: var(--muted); }
.two-col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.stack { display: grid; gap: 20px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); }
.keep { white-space: nowrap; }
.text-link, .prose a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 4px; }
.text-link:hover, .prose a:hover { text-decoration-thickness: 2px; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 8px;
  z-index: 100;
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
  padding: 0;
  clip-path: inset(50%);
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: var(--r-pill);
}
.skip-link:focus {
  width: auto;
  height: auto;
  overflow: visible;
  white-space: normal;
  padding: 10px 18px;
  clip-path: none;
}
.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  line-height: 20px;
  color: var(--muted);
}
.kicker-text { font-family: var(--font-body); font-size: var(--fs-small); color: var(--muted); }
.kicker-rule { width: 1px; height: 12px; flex-shrink: 0; background: var(--line-strong); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 11px 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text);
  font-size: var(--fs-body);
  font-weight: var(--weight-medium);
  line-height: 24px;
  text-align: center;
  transition: background-color var(--ease), border-color var(--ease), color var(--ease);
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn-primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-dark); color: var(--on-accent); border-color: var(--accent-dark); }
.btn-ghost { background: var(--bg); color: var(--text); border-color: var(--line-strong); }
.btn-ghost:hover, .btn-ghost.is-hover { border-color: var(--text); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--panel-2);
  color: var(--muted);
  border-color: var(--line);
  cursor: not-allowed;
}
.btn.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
.card, .panel {
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: var(--card-pad);
  background: var(--bg);
  color: var(--text);
  min-width: 0;
}
.panel { background: var(--panel); color: var(--text); border-radius: var(--r-panel); }
.card h3, .panel h3 { margin-top: 0; }
.card p:last-child, .panel p:last-child { margin-bottom: 0; }
.panel > .card { margin-top: 20px; }
.prose { min-width: 0; }
.prose h2 { margin: 56px 0 20px; }
.prose h3 { margin: 32px 0 14px; }
.prose p { margin: 0 0 20px; }
.prose li + li { margin-top: 8px; }
.prose :not(pre) > code {
  background: var(--panel);
  color: var(--text);
  border-radius: var(--r-sm);
  padding: 2px 5px;
  font-size: .9em;
}
.site-head { position: relative; z-index: 40; background: var(--bg); color: var(--text); }
.head-row {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: min(100%, calc(var(--head-width) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  font-size: 16px;
  font-weight: var(--weight-medium);
  letter-spacing: -.01em;
  color: var(--text);
}
.brand img, .brand-mark { display: block; width: 32px; height: 32px; flex: none; border-radius: var(--r-logo); }
.brand-mark {
  position: relative;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line-strong);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-sm);
}
.nav { display: flex; align-items: center; gap: 2px; min-width: 0; margin-left: auto; }
.nav-primary { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 14px;
  border: 0;
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--muted);
  font-size: var(--fs-nav);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--ease), background-color var(--ease);
}
.nav-link:hover { background: var(--panel); color: var(--text); }
.nav-link[aria-current="page"] { color: var(--text); font-weight: var(--weight-medium); }
.nav-link svg { width: 14px; height: 14px; }
.nav-more, .lang-picker { position: relative; }
.nav-more > summary, .preview-mobile > summary { list-style: none; }
.nav-more > summary::-webkit-details-marker, .preview-mobile > summary::-webkit-details-marker { display: none; }
.nav-more[open] > summary { background: var(--panel); color: var(--text); }
.nav-more[open] > summary svg { transform: rotate(180deg); }
.menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 228px;
  max-width: calc(100vw - var(--gutter) * 2);
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-pop);
}
.menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: var(--tap);
  padding: 9px 12px;
  border-radius: var(--r-shot);
  font-size: 14px;
  color: var(--text);
}
.menu a:hover, .menu a[aria-current="page"] { background: var(--panel); color: var(--text); }
.menu-key { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); }
.head-tools { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.head-sep { width: 1px; height: 20px; flex: none; background: var(--line); }
.lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 36px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
}
.lang:hover { border-color: var(--text); }
.lang svg { width: 15px; height: 15px; color: var(--muted); }
.lang .chev { width: 13px; height: 13px; }
.lang-short { display: none; }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: var(--tap);
  min-height: var(--tap);
  padding: 10px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
}
.menu-toggle svg { width: 20px; height: 20px; }
.nav-veil {
  position: fixed;
  inset: var(--nav-h) 0 0;
  z-index: 41;
  background: var(--veil);
  color: var(--text);
  border: 0;
  padding: 0;
}
.mobile-drawer {
  position: absolute;
  top: var(--nav-h);
  inset-inline: 0;
  z-index: 42;
  max-height: calc(100dvh - var(--nav-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px var(--gutter) 24px;
  background: var(--bg);
  color: var(--text);
  border-bottom: 1px solid var(--line);
}
.mobile-drawer ul { margin: 0; padding: 0; list-style: none; }
.mobile-drawer a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: var(--tap);
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
}
.mobile-drawer a[aria-current="page"] { color: var(--accent-dark); }
.drawer-languages { margin-top: 20px; }
.drawer-languages .kicker { margin-bottom: 8px; }
.hero { position: relative; overflow-x: clip; padding-top: 44px; padding-bottom: 32px; }
.hero-head { display: grid; grid-template-columns: minmax(0, 1fr) 492px; gap: 72px; align-items: end; }
.hero-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  font-size: var(--fs-hero);
  line-height: 1.14;
  letter-spacing: var(--tracking-title);
  color: var(--text);
}
.hero-title .line { display: block; }
.hero-title .line-2 { color: var(--muted); }
.hero-lede { margin: 0; font-size: 17px; line-height: 1.65; color: var(--muted); }
.hero-lede strong { color: var(--text); font-weight: var(--weight-medium); }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.platforms { display: flex; align-items: center; gap: 20px; margin-top: 32px; min-height: 30px; }
.platform-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--line);
}
.platform-list li, .platform-list a { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; line-height: 20px; }
.platform-list a { min-height: 30px; }
.platform-list a:hover { color: var(--accent-dark); }
.platform-list svg { width: 16px; height: 16px; flex: none; color: var(--muted); }
.price-pill {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 30px;
  padding: 4px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  color: var(--muted);
}
.price-pill b { font-weight: var(--weight-medium); color: var(--text); }
.price-dot { width: 3px; height: 3px; flex: none; border-radius: var(--r-round); background: var(--muted); }
.next { padding-bottom: var(--section-space); }
.next-inner { border-top: 1px solid var(--line); padding-top: 36px; }
.next h2 { margin: 14px 0 0; font-size: 30px; }
.next-lede { margin: 12px 0 0; max-width: 620px; color: var(--muted); }
.site-footer { background: var(--bg); color: var(--text); border-top: 1px solid var(--line); padding-top: 48px; padding-bottom: 32px; }
.footer-grid { display: grid; grid-template-columns: 1.25fr .85fr 1fr .65fr; gap: 40px; }
.footer-brand p { max-width: 320px; margin: 20px 0; color: var(--muted); font-size: 14px; }
.footer-col ul { list-style: none; margin: 16px 0 0; padding: 0; }
.footer-col a { display: inline-block; padding-top: 6px; padding-bottom: 6px; font-size: 14px; color: var(--muted); }
.footer-col a:hover, .footer-col a[aria-current="page"] { color: var(--accent-dark); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; margin-top: 44px; border-top: 1px solid var(--line); padding-top: 24px; font-size: var(--fs-small); color: var(--muted); }
.footer-bottom p { margin: 0; }
.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(12px); }
html.reveal-ready .reveal { transition: opacity var(--reveal-time) ease, transform var(--reveal-time) ease; }
.reveal.shown { opacity: 1; transform: none; }
@media (max-width: 1160px) {
  .hero-head { grid-template-columns: minmax(0, 1fr) 440px; gap: 48px; }
  .head-row { gap: 12px; }
  .nav-link { padding-inline: 10px; }
}
@media (max-width: 1080px) {
  .desktop-nav { display: none; }
  .head-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .head-sep { display: none; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1081px) {
  .mobile-drawer, .nav-veil { display: none !important; }
}
@media (max-width: 980px) {
  .hero-head { grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: start; }
  .platforms { flex-wrap: wrap; }
  .price-pill { margin-left: 0; }
}
@media (max-width: 768px) {
  :root { --fs-h1: 28px; --fs-hero: 28px; --section-space: 140px; }
  .two-col, .card-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  :root { --gutter: 20px; --nav-h: 60px; --card-pad: 20px; }
  .hero { padding-top: 28px; }
  .hero-lede { font-size: 16px; }
  .platforms { gap: 12px; }
  .platform-list { padding-left: 0; border-left: 0; gap: 10px 18px; }
  .next h2 { font-size: 24px; }
}
@media (max-width: 640px) {
  .brand { gap: 8px; font-size: 14px; }
  .brand img, .brand-mark { width: 28px; height: 28px; }
  .head-row { gap: 8px; }
  .head-tools { margin-left: auto; gap: 6px; }
  .lang { padding-inline: 10px; min-height: var(--tap); }
  .lang-full, .lang-globe { display: none; }
  .lang-short { display: inline; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .cluster { flex-direction: row; flex-wrap: wrap; }
  .tilt, [data-tilt] { transform: none !important; }
  .btn { max-width: 100%; padding-inline: 20px; }
}
@media (max-width: 360px) {
  :root { --gutter: 16px; }
  .brand { font-size: 12px; gap: 6px; }
  .head-tools { gap: 4px; }
  .hero-title { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}