:root {
  --c-bg:#ffffff;
  --c-panel:#f4f4f2;
  --c-field:#0c0d0c;
  --c-border:#e4e4e1;
  --c-accent:#9ef05a;
  --c-accent-dark:#3f7d14;
  --c-text:#111211;
  --c-muted:#5d605b;
  --c-success:#2f9e44;
  --c-warn:#c98a0b;
  --c-error:#d63c2f;
  --c-on-dark:#ffffff;
  --c-on-dark-2:rgba(255,255,255,.72);
  --c-on-dark-3:rgba(255,255,255,.5);
  --c-line-dark:rgba(255,255,255,.2);
  --c-line-dark-strong:rgba(255,255,255,.55);
  --c-line-dark-soft:rgba(255,255,255,.09);
  --c-hover-dark:rgba(255,255,255,.07);
  --c-device-body:#161716;
  --c-device-edge:#2a2b2a;
  --c-device-ink:#050605;
  --c-screen-mid:#4a8a22;
  --c-screen-deep:#0a1307;
  --c-sheen:rgba(255,255,255,.9);
  --c-sheen-soft:rgba(255,255,255,.3);
  --c-glass:rgba(255,255,255,.14);
  --c-horizon:rgba(255,255,255,.12);
  --c-tabletop:rgba(255,255,255,.028);
  --c-clear:transparent;
  --c-veil:rgba(0,0,0,.55);
  --shadow-contact:0 26px 16px -20px rgba(0,0,0,.8),0 1px 0 rgba(0,0,0,.06);
  --shadow-menu:0 20px 40px -28px rgba(0,0,0,.5);
  --f-display:"Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --f-body:"Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-medium:600;
  --weight-heavy:800;
  --r-sheet:40px;
  --r-card:20px;
  --r-feature:28px;
  --r-menu:20px;
  --r-btn:12px;
  --r-item:10px;
  --r-mark:9px;
  --r-small:6px;
  --r-dot:2px;
  --r-rule:1.5px;
  --r-pill:999px;
  --r-circle:50%;
  --r-phone:40px;
  --r-screen:31px;
  --track-tight:-.035em;
  --track-cjk:-.02em;
  --track-brand:-.01em;
  --track-button:-.005em;
  --track-label:.04em;
  --wrap:1280px;
  --read-width:800px;
  --gutter:80px;
  --nav-h:80px;
  --sheet-peek:48px;
  --section-gap:168px;
  --line:1px;
  --motion-fast:.2s;
  --motion-reveal:.65s;
  --ease:ease;
  --focus-width:2px;
  --focus-offset:3px;
}
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
html.nav-open{overflow:hidden}
body{font-family:var(--f-body);font-weight:var(--weight-normal);background:var(--c-bg);color:var(--c-text);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{color:inherit;background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img,svg{vertical-align:middle}
img{max-width:100%}
svg{flex-shrink:0}
ul,ol{list-style:none}
[hidden]{display:none!important}
:focus-visible{outline:var(--focus-width) solid var(--c-accent-dark);outline-offset:var(--focus-offset);border-radius:var(--r-item)}
.stage :focus-visible,.site-footer :focus-visible{outline-color:var(--c-accent)}
::selection{background:var(--c-accent);color:var(--c-text)}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:var(--weight-heavy);line-height:1.2;letter-spacing:var(--track-cjk);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(34px,3.4vw,48px)}
h2{font-size:clamp(28px,3vw,40px)}
h3{font-size:24px}
p{overflow-wrap:break-word}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:24px;border:var(--line) solid var(--c-border);border-radius:var(--r-item);background:var(--c-panel);color:var(--c-text);font-size:14px}
pre code{font-size:inherit;overflow-wrap:normal;word-break:normal;white-space:pre}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter) * 2);margin-inline:auto;padding-inline:var(--gutter)}
.read-wrap{width:100%;max-width:calc(var(--read-width) + var(--gutter) * 2);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*,.grid>*,.hero>*,.footer-grid>*,.card-grid>*{min-width:0}
.section{margin-top:var(--section-gap)}
.section-head{max-width:720px;margin-bottom:40px}
.section-head h2{margin-top:16px;margin-bottom:20px}
.section-head p,.muted{color:var(--c-muted)}
.nowrap{white-space:nowrap}
.text-link{font-weight:var(--weight-medium);text-decoration:underline;text-decoration-thickness:var(--line);text-underline-offset:5px}
.text-link:hover{color:var(--c-accent-dark)}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--c-muted)}
.kicker::before,.eyebrow-dot{content:"";width:8px;height:8px;flex-shrink:0;border-radius:var(--r-dot);background:var(--c-accent)}
.card,.panel{border:var(--line) solid var(--c-border);background:var(--c-bg);color:var(--c-text);border-radius:var(--r-card);padding:28px}
.panel{background:var(--c-panel);color:var(--c-text);border-radius:var(--r-sheet);padding:40px}
.card h3{margin-bottom:16px}
.card p{color:var(--c-muted)}
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:12px 26px;border-radius:var(--r-btn);font-size:16px;font-weight:var(--weight-medium);letter-spacing:var(--track-button);line-height:1.5;text-align:center;transition:transform var(--motion-fast) var(--ease),opacity var(--motion-fast) var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn:active,.btn.is-active{transform:translateY(0);opacity:.9}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none}
.btn-store,.btn-primary{background:var(--c-accent);color:var(--c-text)}
.btn-store svg{width:18px;height:18px}
.btn-line{border:1.5px solid var(--c-on-dark);color:var(--c-on-dark)}
.btn-line svg{width:16px;height:16px}
.btn-outline{border:var(--line) solid var(--c-text);background:var(--c-bg);color:var(--c-text)}
.btn-dark{background:var(--c-field);color:var(--c-on-dark)}
.btn.is-hover{transform:translateY(-1px);outline:var(--line) solid var(--c-accent-dark)}
.btn.is-focus{outline:var(--focus-width) solid var(--c-accent-dark);outline-offset:var(--focus-offset)}
.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.topbar,#site-header{position:relative;z-index:20;background:var(--c-field);color:var(--c-on-dark)}
.topbar-row{position:relative;height:var(--nav-h);display:flex;align-items:center;gap:32px;width:100%;max-width:min(100%,calc(1280px + var(--gutter) * 2));margin-inline:auto;padding-inline:var(--gutter)}
.brand{display:inline-flex;align-items:center;gap:12px;font-family:var(--f-display);font-weight:var(--weight-heavy);font-size:17px;letter-spacing:var(--track-brand);color:var(--c-on-dark);flex-shrink:0}
.brand-mark{width:32px;height:32px;border-radius:var(--r-circle);background:var(--c-bg);color:var(--c-text);border:var(--line) solid var(--c-border);flex-shrink:0;display:block}
.brand-placeholder{border-radius:var(--r-mark)}
.primary-nav{margin-left:auto;min-width:0}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px}
.nav-list a,.more-toggle{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 14px;border-radius:var(--r-pill);font-size:15px;color:var(--c-on-dark-2);white-space:nowrap;transition:opacity var(--motion-fast) var(--ease)}
.nav-list a:hover,.more-toggle:hover{background:var(--c-hover-dark);color:var(--c-on-dark)}
.nav-list a[aria-current="page"]{color:var(--c-on-dark);position:relative}
.nav-list a[aria-current="page"]::after{content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;border-radius:var(--r-dot);background:var(--c-accent)}
.nav-more,.nav-more details{position:relative}
.more-toggle{list-style:none;cursor:pointer;user-select:none}
.more-toggle::-webkit-details-marker{display:none}
.more-toggle svg{width:12px;height:12px;transition:transform var(--motion-fast) var(--ease)}
.nav-more details[open] .more-toggle{background:var(--c-hover-dark);color:var(--c-on-dark)}
.nav-more details[open] .more-toggle svg{transform:rotate(180deg)}
.more-menu{position:absolute;right:0;top:calc(100% + 12px);min-width:380px;display:grid;grid-template-columns:1fr 1fr;gap:8px 20px;padding:18px;background:var(--c-bg);color:var(--c-text);border:var(--line) solid var(--c-border);border-radius:var(--r-menu);box-shadow:var(--shadow-menu)}
.menu-label{font-size:12px;font-weight:var(--weight-medium);color:var(--c-muted);letter-spacing:var(--track-label);padding:4px 10px 6px}
.more-menu a{display:flex;width:100%;min-height:44px;padding:9px 10px;border-radius:var(--r-item);font-size:15px;color:var(--c-text)}
.more-menu a:hover,.more-menu a[aria-current="page"]{background:var(--c-panel);color:var(--c-text)}
.more-menu a[aria-current="page"]::after{display:none}
.header-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language-control{position:relative}
.lang-switch{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 16px;border:var(--line) solid var(--c-line-dark);border-radius:var(--r-pill);font-size:14px;color:var(--c-on-dark);white-space:nowrap}
.lang-switch svg{width:16px;height:16px;color:var(--c-on-dark-2)}
.lang-switch:hover{border-color:var(--c-line-dark-strong)}
.lang-short{display:none}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);min-width:190px;padding:8px;border:var(--line) solid var(--c-border);border-radius:var(--r-menu);background:var(--c-bg);color:var(--c-text);box-shadow:var(--shadow-menu)}
.language-menu a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-item)}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--c-panel);color:var(--c-text)}
.menu-button{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:var(--line) solid var(--c-line-dark);border-radius:var(--r-btn);color:var(--c-on-dark)}
.menu-button svg{width:22px;height:22px}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--nav-h) 0 0;background:var(--c-veil);color:var(--c-on-dark);z-index:0;cursor:pointer}
.stage{position:relative;height:clamp(760px,100vh,980px);background:var(--c-field);color:var(--c-on-dark);overflow:hidden;isolation:isolate}
.scene{position:absolute;z-index:0;top:var(--nav-h);bottom:var(--sheet-peek);right:0;width:58%;pointer-events:none;overflow-x:clip}
.scene-glow{position:absolute;right:-260px;top:calc(50% + 40px);width:940px;height:460px;border-radius:var(--r-circle);background:radial-gradient(ellipse at center,var(--c-accent) 0%,var(--c-clear) 66%);opacity:.18}
.scene-table{position:absolute;left:0;right:0;top:calc(50% + 182px);bottom:calc(var(--sheet-peek) * -1);background:linear-gradient(180deg,var(--c-tabletop) 0%,var(--c-clear) 70%)}
.scene-horizon{position:absolute;left:0;right:0;top:calc(50% + 182px);height:1px;background:linear-gradient(90deg,var(--c-clear) 0%,var(--c-horizon) 38%,var(--c-horizon) 100%)}
.hero{position:relative;z-index:1;height:calc(100% - var(--nav-h) - var(--sheet-peek));display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);align-items:center}
.hero-copy{padding-right:24px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;padding:6px 14px 6px 10px;border:var(--line) solid var(--c-line-dark-soft);border-radius:var(--r-pill);font-size:13px;color:var(--c-on-dark-2)}
.hero-title{margin:28px 0 22px;font-family:var(--f-display);font-size:clamp(30px,3.4vw,48px);line-height:1.12;letter-spacing:var(--track-cjk);color:var(--c-on-dark)}
.hero-title .t-heavy{display:block;font-weight:var(--weight-heavy);letter-spacing:var(--track-tight)}
.hero-title .t-light{display:block;font-weight:var(--weight-normal)}
.hero-lead{max-width:34em;font-size:17px;line-height:1.75;color:var(--c-on-dark-2)}
.hero-lead strong{color:var(--c-on-dark);font-weight:var(--weight-medium)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
.device-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;margin-top:40px}
.devices{display:flex;flex-wrap:wrap;gap:12px 22px}
.devices li,.devices a{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--c-on-dark-2)}
.devices a:hover{color:var(--c-accent)}
.devices svg{width:20px;height:20px;color:var(--c-on-dark)}
.row-sep{width:1px;height:20px;flex-shrink:0;background:var(--c-line-dark)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;gap:6px;min-height:30px;max-width:100%;padding:4px 12px;border:var(--line) solid var(--c-line-dark-strong);border-radius:var(--r-pill);font-size:13px;color:var(--c-on-dark);overflow-wrap:anywhere}
.chip svg{width:13px;height:13px}
.hero-visual{position:relative;height:100%;display:flex;align-items:center;justify-content:center;pointer-events:none}
.rig{position:relative;width:470px;height:450px;flex-shrink:0}
.screen-spill{position:absolute;left:196px;top:350px;width:320px;height:96px;border-radius:var(--r-circle);background:radial-gradient(ellipse at center,var(--c-accent) 0%,var(--c-clear) 68%);opacity:.16}
.phone{position:absolute;left:238px;top:14px;width:186px;height:380px;padding:1px;border-radius:var(--r-phone);background:linear-gradient(152deg,var(--c-sheen) 0%,var(--c-sheen-soft) 16%,var(--c-clear) 44%),var(--c-device-edge);transform:rotate(-9deg)}
.phone-key{position:absolute;width:3px;background:var(--c-device-edge)}
.phone-key.k-left{left:-3px;border-radius:var(--r-dot) 0 0 var(--r-dot);background:linear-gradient(90deg,var(--c-sheen-soft),var(--c-device-edge))}
.phone-key.k-a{top:82px;height:24px}
.phone-key.k-b{top:122px;height:42px}
.phone-key.k-c{top:174px;height:42px}
.phone-key.k-right{right:-3px;top:132px;height:62px;border-radius:0 var(--r-dot) var(--r-dot) 0}
.phone-body{position:relative;height:100%;padding:9px;border-radius:calc(var(--r-phone) - 1px);background:var(--c-device-body)}
.phone-screen{position:relative;height:100%;border-radius:var(--r-screen);overflow:hidden;background:var(--c-screen-deep)}
.screen-light{position:absolute;inset:0;background:linear-gradient(180deg,var(--c-accent) 0%,var(--c-screen-mid) 40%,var(--c-screen-deep) 100%);opacity:1}
.stage:not(.preview-static) .screen-light{animation:screen-breathe 6s ease-in-out infinite}
.screen-glass{position:absolute;inset:0;background:linear-gradient(118deg,var(--c-glass) 0%,var(--c-clear) 38%)}
.screen-island{position:absolute;top:12px;left:50%;width:62px;height:18px;margin-left:-31px;border-radius:var(--r-pill);background:var(--c-device-ink)}
@keyframes screen-breathe{0%,100%{opacity:.85}50%{opacity:1}}
.rule-card{position:absolute;left:8px;top:278px;z-index:2;padding:16px 24px 20px;background:var(--c-bg);color:var(--c-text);border:var(--line) solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--shadow-contact);transform:rotate(4deg)}
.rule-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:10px;margin-bottom:10px;border-bottom:var(--line) solid var(--c-border);font-family:var(--f-mono);font-size:12px;color:var(--c-muted)}
.rules li{display:flex;align-items:center;gap:12px;font-family:var(--f-mono);font-size:14px;line-height:2;white-space:nowrap}
.rules code{font-family:inherit;font-size:inherit}
.rule-mark{width:6px;height:6px;flex-shrink:0;border-radius:var(--r-rule);background:var(--c-accent)}
.rules .pol{font-weight:var(--weight-medium);color:var(--c-accent-dark)}
.sheet{position:relative;z-index:2;margin-top:calc(var(--sheet-peek) * -1);background:var(--c-bg);color:var(--c-text);border-radius:var(--r-sheet) var(--r-sheet) 0 0;padding-top:120px;padding-bottom:160px}
.dl-intro{max-width:640px}
.dl-intro h2{margin:16px 0 14px;font-size:32px}
.dl-intro p{font-size:17px;color:var(--c-muted)}
.dl-intro code,.prose :not(pre)>code{padding:1px 6px;border-radius:var(--r-small);background:var(--c-panel);color:var(--c-text)}
.prose{min-width:0;font-size:17px;line-height:1.85}
.prose>*+*{margin-top:24px}
.prose h2{margin-top:64px;font-size:32px}
.prose h3{margin-top:40px}
.prose ul,.prose ol{padding-left:1.5em;list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:10px}
.prose a{text-decoration:underline;text-underline-offset:4px}
.prose section{min-width:0}
.reveal{opacity:1;transform:none}
.reveal.reveal-pending{opacity:0;transform:translateY(18px);transition:opacity var(--motion-reveal) var(--ease),transform var(--motion-reveal) var(--ease)}
.reveal.shown{opacity:1;transform:none}
.site-footer{background:var(--c-field);color:var(--c-on-dark);padding-top:80px;padding-bottom:36px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.3fr;gap:64px}
.footer-brand p{margin-top:20px;max-width:32em;color:var(--c-on-dark-2);font-size:14px}
.footer-title{font-size:15px;font-weight:var(--weight-medium);margin-bottom:20px}
.footer-links{display:flex;flex-wrap:wrap;gap:10px 22px}
.footer-links a{display:inline-block;min-height:32px;color:var(--c-on-dark-2);font-size:14px}
.footer-links a:hover{color:var(--c-accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:48px;padding-top:24px;border-top:var(--line) solid var(--c-line-dark)}
.footer-languages a{display:inline-flex;align-items:center;min-height:44px;font-size:14px;color:var(--c-on-dark-2)}
.footer-languages a[aria-current]{color:var(--c-on-dark);text-decoration:underline;text-underline-offset:5px}
.copyright{margin-top:20px;font-size:13px;color:var(--c-on-dark-2)}
.skip-link{position:absolute;left:var(--gutter);top:8px;z-index:50;padding:10px 16px;border-radius:var(--r-btn);background:var(--c-accent);color:var(--c-text);transform:translateY(-160%)}
.skip-link:focus{transform:none}
@media(min-width:961px){.nav-veil{display:none}}
@media(max-width:1240px){
  :root{--gutter:48px}
  .rig{transform:scale(.88)}
  .topbar-row{gap:20px}
  .nav-list a,.more-toggle{padding-inline:11px}
}
@media(max-width:1100px){
  .primary-nav{display:none}
  .header-tools{margin-left:auto}
  .menu-button{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer{position:absolute;left:0;right:0;top:var(--nav-h);z-index:4;background:var(--c-bg);color:var(--c-text);padding:20px var(--gutter);max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;border-bottom:var(--line) solid var(--c-border)}
  .mobile-drawer a{display:flex;align-items:center;min-height:48px;width:100%;padding:12px 14px;border-radius:var(--r-item)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--c-panel);color:var(--c-text)}
  .drawer-languages{margin-top:20px;padding-top:16px;border-top:var(--line) solid var(--c-border)}
  .preview-nav{display:block}
  .preview-nav .nav-flat{display:none}
  .footer-grid{gap:32px}
}
@media(max-width:960px){
  :root{--gutter:24px;--nav-h:64px}
  .stage{height:auto}
  .topbar-row{gap:12px}
  .brand{flex-shrink:1;min-width:0}
  .brand-name{font-size:15px;min-width:0;line-height:1.3;overflow-wrap:anywhere}
  .more-menu{min-width:240px;grid-template-columns:1fr}
  .lang-switch{padding-inline:12px}
  .hero{height:auto;grid-template-columns:1fr;padding-top:40px;padding-bottom:calc(var(--sheet-peek) + 48px);gap:8px}
  .hero-copy{padding-right:0}
  .hero-visual{height:440px}
  .rig{transform:scale(.82)}
  .scene{top:auto;width:100%;height:520px}
  .scene-horizon,.scene-table{top:calc(50% + 146px)}
  .scene-glow{right:-360px;width:760px;height:380px;top:calc(50% + 20px)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  h1,.hero-title{font-size:clamp(24px,4vw,30px)}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .card-grid,.footer-grid{grid-template-columns:1fr}
  .card,.panel{padding:24px}
  .sheet{padding-top:80px}
  .prose{font-size:16px}
  .prose h2{font-size:28px}
  .tilt,.decorative-tilt,.rule-card{transform:none}
  .hero-title{line-height:1.2}
  .footer-brand{grid-column:auto}
  .lang-text{display:none}
  .lang-short{display:inline}
  .preview-nav{margin-left:auto}
}
@media(max-width:520px){
  .hero-lead{font-size:16px}
  .hero-actions .btn{flex:1 1 100%}
  .hero-visual{height:380px}
  .rig{transform:scale(.68)}
  .scene-horizon,.scene-table{top:calc(50% + 120px)}
  .row-sep{display:none}
  .brand{gap:8px}
  .lang-switch{padding-inline:10px}
  .brand-name{font-size:14px}
  .preview-nav{display:none}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand-name{font-size:12px}
  .topbar-row{gap:8px}
  .header-tools{gap:4px}
  .brand{gap:6px}
  .brand-mark{width:28px;height:28px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .screen-light{opacity:1}
  .reveal.reveal-pending{opacity:1;transform:none}
  .btn:hover{transform:none}
}