:root {
  --bg:#0A2828;
  --bg-panel:#0F3434;
  --bg-panel-2:#154545;
  --border:#2A5A58;
  --accent:#1FC7A4;
  --accent-dark:#12957B;
  --accent-hover:#3AD6B6;
  --text:#E9F5F2;
  --text-muted:#93B5B0;
  --success:#3DD68C;
  --warn:#F2B84B;
  --error:#FF5F7E;
  --nav-surface:#FFFFFF;
  --nav-ink:#0A2828;
  --nav-muted:#3E5E5C;
  --nav-line:rgba(10,40,40,.10);
  --pink:#FF8DB3;
  --violet:#B26BFF;
  --band-a:#7A1F5C;
  --band-b:#34125E;
  --ice:#F2FBF9;
  --paper:#EEF4F3;
  --card:#FFFFFF;
  --ink:#0A2828;
  --ink-muted:#557572;
  --ink-line:#D6E4E1;
  --seg-bg:#DDE9E6;
  --toggle-off:#C3D5D1;
  --phone-a:#16494A;
  --phone-b:#0A2626;
  --accent-a10:rgba(31,199,164,.10);
  --accent-a18:rgba(31,199,164,.18);
  --accent-a30:rgba(31,199,164,.30);
  --accent-a55:rgba(31,199,164,.55);
  --accent-a75:rgba(31,199,164,.75);
  --pink-a14:rgba(255,141,179,.14);
  --pink-a35:rgba(255,141,179,.35);
  --pink-a60:rgba(255,141,179,.60);
  --violet-a14:rgba(178,107,255,.14);
  --violet-a35:rgba(178,107,255,.35);
  --muted-a35:rgba(147,181,176,.35);
  --hairline:rgba(31,199,164,.20);
  --hairline-strong:rgba(31,199,164,.38);
  --shadow-deep:rgba(1,12,12,.62);
  --shadow-soft:rgba(1,12,12,.34);
  --white-a90:rgba(255,255,255,.90);
  --clear:transparent;
  --mask-solid:#000000;
  --mask-half:rgba(0,0,0,.5);
  --mask-faint:rgba(0,0,0,.14);
  --mask-dense:rgba(0,0,0,.7);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-sm:6px;
  --r-md:8px;
  --r-band:14px;
  --r-pill:999px;
  --r-circle:50%;
  --r-phone:38px;
  --r-screen:30px;
  --r-line:2px;
  --nav-h:68px;
  --wrap:1280px;
  --reading:840px;
  --gutter:48px;
  --section-space:88px;
  --motion-fast:200ms;
  --motion-reveal:600ms;
  --panel-shadow:0 22px 44px -24px var(--shadow-deep);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--accent-a18)}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-hover)}
button:disabled{cursor:not-allowed}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:var(--r-sm)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:400;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(34px,3.4vw,48px);line-height:1.2;letter-spacing:-.005em}
h2{font-size:clamp(26px,2.5vw,36px);line-height:1.3}
h3{font-size:22px;line-height:1.4}
p{margin-block:0 1.2em}
strong{font-weight:600}
ul,ol{padding-inline-start:1.5em}
li+li{margin-top:.35em}
code,kbd,samp,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--r-sm);font-size:14px;line-height:1.8;overscroll-behavior-inline:contain}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
::selection{background:var(--accent);color:var(--ink)}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading{max-width:calc(var(--reading) + var(--gutter)*2)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*,.hero-grid>*,.bento>*,.footer-grid>*,.feature-browser>*{min-width:0}
.nowrap{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.decorated,.hero,.feature-band{position:relative;overflow-x:clip}
.panel,.card{background:var(--bg-panel);color:var(--text);border:1px solid var(--hairline);border-radius:var(--r-md);padding:28px;box-shadow:var(--panel-shadow)}
.panel-secondary{background:var(--bg-panel-2);color:var(--text)}
.card p:last-child,.panel p:last-child{margin-bottom:0}
.card h3{margin-top:0}
.btn,.btn-primary,.btn-secondary,.btn-text{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:10px 26px;border:1px solid var(--clear);border-radius:var(--r-sm);font-size:16px;font-weight:600;line-height:1.4;text-align:center;transition:background-color var(--motion-fast),transform var(--motion-fast),border-color var(--motion-fast)}
.btn-primary{background:var(--accent);color:var(--ink);box-shadow:0 14px 30px -14px var(--accent-a75),inset 0 -2px 0 var(--accent-dark)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-hover);color:var(--ink);transform:translateY(-1px)}
.btn-primary:active,.btn-primary.is-active{transform:translateY(1px);box-shadow:inset 0 2px 0 var(--accent-dark)}
.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border)}
.btn-secondary:hover{background:var(--bg-panel-2);color:var(--text);border-color:var(--accent)}
.btn-text{padding-inline:0;font-weight:500;color:var(--text);background:var(--clear)}
.btn-text:hover{color:var(--accent)}
.btn-text .arr{transition:transform var(--motion-fast)}
.btn-text:hover .arr{transform:translateX(3px)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled,[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);box-shadow:none;transform:none;cursor:not-allowed}
.btn svg,.btn-primary svg{width:18px;height:18px;flex-shrink:0}
.cta-row{display:flex;align-items:center;gap:30px;flex-wrap:wrap;margin-top:28px}
.topbar{position:relative;z-index:40;height:var(--nav-h);background:var(--nav-surface);color:var(--nav-ink);border-bottom:1px solid var(--nav-line)}
.header-inner{position:relative;width:100%;max-width:min(100%,calc(1280px + var(--gutter)*2));height:100%;margin-inline:auto;padding-inline:var(--gutter);display:flex;align-items:center}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--nav-ink);flex-shrink:0}
.brand:hover{color:var(--nav-ink)}
.brand-mark{width:34px;height:34px;display:block;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-size:17px;font-weight:500;letter-spacing:.01em}
.mainnav{margin-left:auto;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:44px}
.mainnav li{margin:0}
.mainnav a{position:relative;display:block;padding:6px 0;color:var(--nav-muted);font-size:15px;white-space:nowrap;transition:color var(--motion-fast)}
.mainnav a:hover{color:var(--nav-ink)}
.mainnav a[aria-current="page"]{color:var(--nav-ink);font-weight:600}
.mainnav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);color:var(--ink);border-radius:var(--r-line)}
.header-tools{display:flex;align-items:center;gap:8px;margin-left:40px;flex-shrink:0}
.language-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:6px 14px;background:var(--nav-surface);color:var(--nav-ink);border:1px solid var(--nav-line);border-radius:var(--r-sm);font-size:14px;white-space:nowrap}
.lang:hover{border-color:var(--accent-a55);color:var(--nav-ink)}
.lang-caret{font-size:11px;color:var(--nav-muted)}
.lang-short{display:none}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);min-width:180px;padding:8px;background:var(--nav-surface);color:var(--nav-ink);border:1px solid var(--nav-line);border-radius:var(--r-md);box-shadow:0 16px 36px var(--shadow-soft);z-index:5}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--nav-ink);border-radius:var(--r-sm)}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--paper);color:var(--nav-ink)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--nav-line);border-radius:var(--r-sm);background:var(--nav-surface);color:var(--nav-ink)}
.menu-toggle svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.6}
.mobile-drawer{position:absolute;top:100%;left:0;right:0;padding:16px var(--gutter) 24px;background:var(--nav-surface);color:var(--nav-ink);max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--nav-line);box-shadow:0 24px 40px var(--shadow-soft);z-index:4}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer li{margin:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 8px;color:var(--nav-ink)}
.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{font-weight:600;text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:6px}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--nav-line)}
.drawer-label{color:var(--nav-muted);font-size:13px;padding-inline:8px}
.nav-veil{position:fixed;inset:var(--nav-h) 0 0;z-index:30;background:var(--shadow-deep);color:var(--text);border:0;cursor:default}
.preview-mobile{display:none;margin-left:auto}
.preview-mobile summary{list-style:none;cursor:pointer}
.preview-mobile nav{position:absolute;inset:var(--nav-h) 0 auto;padding:20px var(--gutter);background:var(--nav-surface);color:var(--nav-ink);border-bottom:1px solid var(--nav-line);max-height:calc(100dvh - var(--nav-h));overflow-y:auto}
.preview-mobile nav a{display:flex;align-items:center;min-height:44px;width:100%;padding:10px;color:var(--nav-ink)}
.site-footer{background:var(--bg-panel);color:var(--text);border-top:1px solid var(--hairline);padding-top:64px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.25fr .8fr 1.4fr .7fr;gap:40px}
.site-footer .brand,.site-footer .brand:hover{color:var(--text)}
.footer-brand p{max-width:28em;margin-top:18px;color:var(--text-muted);font-size:14px}
.footer-title{font-size:15px;font-weight:500;margin:0 0 16px}
.footer-links{list-style:none;padding:0;margin:0}
.footer-links li{margin:0}
.footer-links a{display:inline-block;max-width:100%;padding-block:5px;color:var(--text-muted);font-size:14px;overflow-wrap:break-word}
.footer-links a:hover{color:var(--accent)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{color:var(--text-muted)}
.footer-legal a:hover{color:var(--accent)}
.prose{min-width:0;line-height:1.9}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose p,.prose li{overflow-wrap:break-word}
.prose img{display:block;margin-block:24px}
.prose [id],section[id]{scroll-margin-top:28px}
.reveal{opacity:1;transform:none}
html.reveal-ready .reveal:not(.shown){opacity:0;transform:translateY(18px)}
html.reveal-ready .reveal{transition:opacity var(--motion-reveal) ease,transform var(--motion-reveal) ease}
html.reveal-ready .reveal.shown{opacity:1;transform:none}
@media(min-width:1440px){.topbar .header-inner{max-width:calc(1280px + var(--gutter)*2)}}
@media(max-width:1280px){
  html:not([lang="zh-CN"]) .mainnav{display:none}
  html:not([lang="zh-CN"]) .menu-toggle{display:inline-flex}
  html:not([lang="zh-CN"]) .header-tools{margin-left:auto}
}
@media(max-width:1180px){.mainnav ul{gap:28px}.header-tools{margin-left:24px}}
@media(max-width:960px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:860px){
  .mainnav{display:none}
  .menu-toggle{display:inline-flex}
  .header-tools{margin-left:auto}
  .preview-mobile{display:block}
  .preview-header .header-tools{margin-left:8px}
}
@media(max-width:768px){h1{font-size:clamp(24px,5vw,30px)}:root{--section-space:56px}}
@media(max-width:640px){
  :root{--gutter:20px}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{gap:28px}
  .brand{gap:8px}
  .brand-name{font-size:14px}
  .brand-mark{width:30px;height:30px}
  .lang-full{display:none}
  .lang-short{display:inline}
  .lang{padding-inline:10px}
  .header-tools{gap:6px}
  .tilt,[data-tilt]{transform:none!important}
  .panel,.card{padding:22px}
  .cta-row{gap:16px}
  .footer-bottom{flex-direction:column}
}
@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}
}