:root {
  --bg:#F3F4F6;
  --panel:#FFFFFF;
  --panel-2:#E9ECF0;
  --border:#DDE1E7;
  --accent:#0B7F8C;
  --accent-dark:#075E68;
  --accent-soft:#E2F1F2;
  --accent-glow:rgba(11,127,140,.28);
  --on-accent:#FFFFFF;
  --coral:#F26B4E;
  --coral-soft:#FDEEE9;
  --text:#14171C;
  --muted:#5A6270;
  --faint:#8D94A1;
  --success:#1F9D6A;
  --warn:#E08A1E;
  --error:#D6453D;
  --line-coral:#F6C4B6;
  --line-cyan:#A8DCE0;
  --line-lilac:#DCCBEF;
  --line-mint:#B4E4D3;
  --tint-lilac:#F7F3FC;
  --tint-mint:#EFF8F4;
  --spec-apricot:#FFD9C2;
  --spec-pink:#F6CFE4;
  --spec-sky:#C2E4F6;
  --spec-mint:#C8F1E4;
  --spec-line-1:#F3BCA6;
  --spec-line-2:#E9B6D4;
  --spec-line-3:#A6D2EB;
  --spec-line-4:#A3DDC9;
  --glass:rgba(255,255,255,.62);
  --glass-strong:rgba(255,255,255,.78);
  --glass-line:rgba(20,23,28,.07);
  --mock-bg:#12151C;
  --mock-bar:#0D1015;
  --mock-row:#191D26;
  --mock-line:#252B36;
  --mock-edge:#2A303C;
  --mock-depth:#07090C;
  --mock-text:#E6E9EF;
  --mock-muted:#A5ADBD;
  --mock-off:#2E3441;
  --mock-knob:#7D8697;
  --mock-hi:rgba(255,255,255,.06);
  --mask-solid:#000000;
  --mask-upper:rgba(0,0,0,.86);
  --mask-lower:rgba(0,0,0,.46);
  --clear:transparent;
  --veil:rgba(20,23,28,.34);
  --shadow-card:0 1px 2px rgba(20,23,28,.04),0 10px 26px -14px rgba(20,23,28,.14);
  --shadow-lift:0 2px 4px rgba(20,23,28,.05),0 20px 38px -18px rgba(20,23,28,.22);
  --shadow-bar:0 1px 2px rgba(20,23,28,.05),0 22px 56px -20px rgba(242,107,78,.26),0 16px 48px -24px rgba(11,127,140,.30);
  --shadow-btn:inset 0 1px 0 rgba(255,255,255,.18),0 10px 22px -10px rgba(11,127,140,.60);
  --shadow-ink:rgba(12,15,22,.42);
  --shadow-frame:0 1px 2px rgba(20,23,28,.04),0 30px 60px -36px rgba(92,64,140,.30);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:8px;
  --r-sm:10px;
  --r-control:12px;
  --r-btn:14px;
  --r-screen:18px;
  --r-card:24px;
  --r-tray:28px;
  --r-frame:32px;
  --r-pill:999px;
  --nav-h:68px;
  --wrap:1232px;
  --reading:820px;
  --gutter:24px;
  --space-section:88px;
  --ease:180ms ease;
  --ease-long:240ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:90px}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--font-body);-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
button,a{-webkit-tap-highlight-color:var(--clear)}
button{cursor:pointer}
button{color:var(--text)}
a{color:inherit;text-decoration:none}
a,button,input,select,textarea{touch-action:manipulation}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(34px,3.35vw,48px);line-height:1.14;font-weight:900;letter-spacing:-.02em}
h2{font-size:clamp(26px,2.6vw,36px);line-height:1.25;font-weight:900;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.35;font-weight:900;letter-spacing:-.01em}
p{margin:0 0 1em}
ul,ol{padding-left:1.5em}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.88em}
pre{max-width:100%;min-width:0;overflow-x:auto;overscroll-behavior-inline:contain;padding:20px;border-radius:var(--r-sm);background:var(--mock-bg);color:var(--mock-text);font-size:13px;line-height:1.8}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre;font-size:inherit}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading{max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-heading{margin:0 0 28px}
.section-intro{max-width:680px;color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.nowrap{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.text-link{color:var(--accent);font-weight:700;text-underline-offset:4px}
.text-link:hover{text-decoration:underline}
.prose{min-width:0;line-height:1.85}
.prose h2{margin:2em 0 .7em}
.prose h3{margin:1.7em 0 .6em}
.prose p,.prose li{overflow-wrap:break-word}
.prose a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose :not(pre)>code{background:var(--panel-2);color:var(--text);padding:2px 5px;border-radius:var(--r-xs)}
.prose img{border-radius:var(--r-sm)}
.prose> :first-child{margin-top:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:50px;padding:10px 24px;border:1px solid var(--clear);border-radius:var(--r-btn);font:700 15px/1.4 var(--font-body);letter-spacing:-.005em;transition:transform var(--ease),background-color var(--ease),box-shadow var(--ease);text-align:center}
.btn svg{width:18px;height:18px;flex-shrink:0}
.btn-main{background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow-btn)}
.btn-main:hover,.btn-main.is-hover{background:var(--accent-dark);color:var(--on-accent);transform:translateY(-1px)}
.btn-sub{background:var(--panel);color:var(--text);border-color:var(--border);box-shadow:var(--shadow-card)}
.btn-sub svg{color:var(--accent)}
.btn-sub:hover,.btn-sub.is-hover{box-shadow:var(--shadow-lift);transform:translateY(-1px)}
.btn:active,.btn.is-pressed{transform:translateY(1px);box-shadow:none}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);border-color:var(--border);box-shadow:none;cursor:not-allowed;transform:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:24px}
.card,.panel{padding:28px;background:var(--panel);color:var(--text);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);min-width:0}
.panel{border-radius:var(--r-frame)}
.card-coral{border-color:var(--line-coral)}
.card-cyan{border-color:var(--line-cyan)}
.card-lilac{border-color:var(--line-lilac)}
.card h3{margin:0 0 12px}
.card p:last-child{margin-bottom:0}
.lift{transition:transform var(--ease-long),box-shadow var(--ease-long)}
.lift:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift)}
.icon-box{width:42px;height:42px;border-radius:var(--r-sm);display:grid;place-items:center;background:var(--coral-soft);color:var(--coral);flex-shrink:0}
.icon-box svg{width:22px;height:22px}
.icon-box.is-teal{background:var(--accent-soft);color:var(--accent)}
.topbar{position:relative;z-index:50;background:var(--glass);color:var(--text);backdrop-filter:saturate(140%) blur(14px);-webkit-backdrop-filter:saturate(140%) blur(14px);border-bottom:1px solid var(--glass-line)}
.header-shell{max-width:min(100%,calc(1280px + var(--gutter)*2));margin-inline:auto;padding-inline:var(--gutter);min-height:var(--nav-h);display:flex;align-items:center;gap:24px;position:relative}
.brand{display:inline-flex;align-items:center;gap:11px;flex-shrink:0}
.brand img{width:34px;height:34px;flex-shrink:0}
.brand-name{font:900 16px/1.3 var(--font-display);letter-spacing:-.01em}
.tabs{display:flex;align-items:stretch;height:var(--nav-h);margin-left:auto;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;padding:0 13px;font-size:14.5px;font-weight:600;color:var(--muted);white-space:nowrap;transition:color var(--ease)}
.tabs a:hover{color:var(--text)}
.tabs a::after{content:"";position:absolute;left:13px;right:13px;bottom:-1px;height:3px;border-radius:var(--r-xs) var(--r-xs) 0 0;background:var(--accent);transform:scaleX(0);opacity:0;transition:transform var(--ease-long),opacity var(--ease-long)}
.tabs a:hover::after{transform:scaleX(.4);opacity:.35}
.tabs a[aria-current="page"]{color:var(--text);font-weight:800}
.tabs a[aria-current="page"]::after{transform:scaleX(1);opacity:1}
.header-tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;gap:7px;min-height:36px;padding:0 12px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--glass-strong);color:var(--text);font:600 13.5px/1 var(--font-body);cursor:pointer;list-style:none}
.lang::-webkit-details-marker{display:none}
.lang svg{width:15px;height:15px;color:var(--muted);flex-shrink:0}
.caret{font-size:11px;color:var(--muted)}
.lang-short{display:none}
.language-list{position:absolute;top:calc(100% + 10px);right:0;min-width:190px;padding:8px;background:var(--panel);color:var(--text);border:1px solid var(--border);border-radius:var(--r-btn);box-shadow:var(--shadow-lift);z-index:5}
.language-list a{display:flex;align-items:center;min-height:44px;padding:9px 12px;border-radius:var(--r-xs)}
.language-list a:hover,.language-list a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--text)}
.menu-toggle svg{width:22px;height:22px}
.menu-veil{position:fixed;inset:var(--nav-h) 0 0;background:var(--veil);color:var(--text);border:0;z-index:1;width:100%}
.mobile-drawer{position:absolute;top:100%;left:0;right:0;z-index:2;max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);color:var(--text);border-bottom:1px solid var(--border);box-shadow:var(--shadow-lift);padding:12px var(--gutter) 24px}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;min-height:48px;width:100%;padding:12px;border-radius:var(--r-sm);font-weight:600}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.drawer-languages{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}
.drawer-label{margin:8px 12px;color:var(--muted);font-size:13px}
.site-footer{background:var(--panel-2);color:var(--text);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.3fr 1fr;gap:36px}
.footer-grid>*{min-width:0}
.footer-grid h2{font-size:15px;margin:0 0 16px}
.footer-grid p{font-size:14px;color:var(--muted);margin-top:16px;max-width:320px}
.footer-links{list-style:none;padding:0;margin:0}
.footer-links a{display:inline-block;padding-top:5px;padding-bottom:5px;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:36px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;gap:20px}
.reveal{opacity:1;transform:none}
.reveal-ready .reveal:not(.shown){opacity:0;transform:translateY(16px)}
.reveal-ready .reveal{transition:opacity 600ms ease,transform 600ms ease}
.reveal.shown{opacity:1;transform:none}
.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:1279px){
  .desktop-nav{display:none}
  .menu-toggle{display:flex}
  .header-tools{margin-left:auto}
}
@media(min-width:1280px){
  .mobile-drawer,.menu-veil{display:none!important}
}
@media(max-width:980px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(24px,4vw,30px)}
  :root{--space-section:56px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .header-shell{gap:12px}
  .brand-name{font-size:14px}
  .header-tools{gap:8px;margin-left:auto}
  .lang-text{display:none}
  .lang-short{display:inline}
  .lang{min-height:44px;padding-inline:10px}
  .card,.panel{padding:20px}
  .footer-grid{gap:28px;grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .tilt,.console,[data-tilt]{transform:none!important}
}
@media(max-width:360px){
  .brand-name{max-width:126px;font-size:13px}
  .header-shell{gap:8px}
  .lang svg{display:none}
  .footer-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal-ready .reveal:not(.shown){opacity:1;transform:none}
}