:root {
  --bg:#FFFFFF;
  --bg-panel:#FDF6EC;
  --bg-panel-2:#F5F6F4;
  --border:#E3E6E2;
  --accent:#0B8457;
  --accent-dark:#0A4A38;
  --text:#14302A;
  --text-muted:#5A6A65;
  --success:#1E8E5A;
  --warn:#B9771C;
  --error:#C0432F;
  --link:#2F62D9;
  --apricot:#F6D9B4;
  --white:#FFFFFF;
  --clear:transparent;
  --glow-warm:rgba(255,254,250,.95);
  --veil:rgba(255,255,255,.74);
  --hairline-ink:rgba(20,48,42,.14);
  --overlay:rgba(20,48,42,.24);
  --shadow-float:0 1px 2px rgba(20,48,42,.06),0 26px 52px -22px rgba(20,48,42,.26);
  --shadow-card:0 1px 0 rgba(20,48,42,.04),0 22px 44px -30px rgba(20,48,42,.30);
  --shadow-knob:0 1px 2px rgba(20,48,42,.22);
  --font-display:Georgia,'Iowan Old Style','Times New Roman','Songti SC','STSong','Noto Serif CJK SC','Source Han Serif SC','SimSun',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-card:24px;
  --r-float:16px;
  --r-small:8px;
  --r-pill:999px;
  --r-circle:50%;
  --nav-h:76px;
  --gutter:40px;
  --content-w:1240px;
  --reading-w:800px;
  --display-size:clamp(34px,3.34vw,48px);
  --heading-size:clamp(28px,2.7vw,40px);
  --subheading-size:clamp(23px,2.2vw,30px);
  --body-size:16px;
  --small-size:14px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-strong:600;
  --ease:200ms ease;
}
*,*::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:var(--body-size);line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
button,input,select,textarea{font:inherit}
button,a{-webkit-tap-highlight-color:var(--clear)}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img,svg{max-width:100%;vertical-align:middle}
img{height:auto}
a{color:inherit;text-underline-offset:3px}
button{color:var(--text)}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-small)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-normal);line-height:1.2;text-wrap:balance;letter-spacing:-.012em}
h1{font-size:var(--display-size);margin:0 0 24px}
h2{font-size:var(--heading-size);margin:0 0 24px}
h3{font-size:var(--subheading-size);margin:0 0 16px}
h4{font-size:22px}
p{margin:0 0 20px}
strong{font-weight:var(--weight-strong)}
small{font-size:var(--small-size)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;padding:24px;border:1px solid var(--border);border-radius:var(--r-float);background:var(--bg-panel-2);color:var(--text);font-size:14px;line-height:1.8}
pre code{white-space:pre;overflow-wrap:normal;word-break:normal}
hr{border:0;border-top:1px solid var(--border);margin:40px 0}
.wrap{width:100%;max-width:calc(var(--content-w) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading{max-width:calc(var(--reading-w) + var(--gutter)*2)}
.sec{padding-top:104px;padding-bottom:104px}
.section-head{max-width:700px;margin-bottom:48px}
.muted,.lede{color:var(--text-muted)}
.prose{min-width:0}
.prose :where(p,li){overflow-wrap:break-word}
.prose :where(h2,h3,h4){scroll-margin-top:32px;margin-top:48px}
.prose a:not(.btn){color:var(--link)}
.prose li{margin-bottom:8px}
.prose img{border-radius:var(--r-float)}
.nowrap{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.grid{display:grid;gap:28px;grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*,:where(.wrap,.card,.panel,.prose,.nav,.topbar-in,.footer-grid,.dl-in,.dl-grid)>*{min-width:0}
.stack{display:flex;flex-direction:column;gap:24px}
.inline-set{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.ico{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;display:block;width:20px;height:20px;flex-shrink:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:10px 28px;border:0;border-radius:var(--r-pill);font-size:16px;line-height:1.4;font-weight:var(--weight-medium);text-decoration:none;text-align:center;background:var(--bg);color:var(--text);transition:background-color var(--ease),box-shadow var(--ease),color var(--ease)}
.btn .ico{width:18px;height:18px}
.btn-solid{background:var(--accent);color:var(--white)}
.btn-solid:hover,.btn-solid.is-hover{background:var(--accent-dark);color:var(--white)}
.btn-solid:active{box-shadow:inset 0 0 0 2px var(--accent-dark)}
.btn-line{color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text);background:var(--clear)}
.btn-line:hover,.btn-line.is-hover{background:var(--bg-panel-2);color:var(--text)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);pointer-events:none}
.btn-small{min-height:44px;padding:8px 20px;font-size:14px}
.text-link{color:var(--link)}
.card,.panel{padding:32px;border-radius:var(--r-card);background:var(--bg);color:var(--text);border:1px solid var(--border);min-width:0}
.panel{background:var(--bg-panel-2);color:var(--text);border:0}
.card-float{box-shadow:var(--shadow-float)}
.card p:last-child,.panel p:last-child{margin-bottom:0}
.reveal{opacity:1;transform:none}
.reveal.reveal-ready{opacity:0;transform:translateY(16px);transition:opacity 600ms ease,transform 600ms ease}
.reveal.shown{opacity:1;transform:none}
/* 页头独立宽版心，不复用正文 wrap。 */
.topbar,#site-header{height:var(--nav-h);position:relative;z-index:50;background:var(--bg);color:var(--text)}
.topbar-in{max-width:min(100%,calc(1280px + var(--gutter)*2));height:100%;margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:32px}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand img{width:36px;height:36px;display:block;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-weight:var(--weight-normal);font-size:23px;letter-spacing:-.005em;white-space:nowrap}
.nav{display:flex;align-items:center;min-width:0;margin-left:auto}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:34px}
.nav-list a{display:block;padding:8px 0;font-size:15.5px;white-space:nowrap;color:var(--text-muted);text-decoration:none;transition:color var(--ease)}
.nav-list a:hover{color:var(--text)}
.nav-list a[aria-current="page"]{color:var(--text);font-weight:var(--weight-strong)}
.header-tools{display:flex;align-items:center;gap:12px;flex-shrink:0}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:6px 18px;font:inherit;font-size:14px;white-space:nowrap;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:var(--r-pill)}
.lang:hover{border-color:var(--text-muted)}
.lang-caret{font-size:11px;color:var(--text-muted)}
.lang-short{display:none}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);width:192px;list-style:none;margin:0;padding:8px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--r-float);box-shadow:var(--shadow-float);z-index:6}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 16px;text-decoration:none;border-radius:var(--r-small)}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--bg-panel-2);color:var(--text)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--r-pill)}
.mobile-drawer{display:none}
.menu-veil{position:fixed;inset:var(--nav-h) 0 0;background:var(--overlay);color:var(--text);border:0;z-index:1;width:100%}
.site-footer{border-top:1px solid var(--border);background:var(--bg);color:var(--text);padding-top:72px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.1fr .8fr 1.3fr;gap:64px}
.footer-brand p{max-width:300px;margin-top:20px;font-size:14px;color:var(--text-muted)}
.footer-title{font-family:var(--font-body);font-size:14px;font-weight:var(--weight-strong);margin:0 0 16px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-links a,.footer-languages a,.footer-bottom a{font-size:14px;color:var(--text-muted);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-bottom a:hover{color:var(--text);text-decoration:underline}
.hot-links{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:24px}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px;margin-top:24px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
/* 插画仅用以下语义色类。 */
.f-none{fill:none}.f-white{fill:var(--white)}.f-cream{fill:var(--bg-panel)}.f-gray{fill:var(--bg-panel-2)}.f-line{fill:var(--border)}.f-apricot{fill:var(--apricot)}.f-green{fill:var(--accent)}.f-deep{fill:var(--accent-dark)}.f-ink{fill:var(--text)}
.s-ink{stroke:var(--text)}.s-white{stroke:var(--white)}.s-cream{stroke:var(--bg-panel)}.s-apricot{stroke:var(--apricot)}.s-green{stroke:var(--accent)}
/* 拍板首屏：全静态，暖白光晕只在右上与左下。 */
.hero{position:relative;overflow:hidden;overflow-x:clip;background-color:var(--bg-panel);color:var(--text);background-image:radial-gradient(58% 70% at 93% 2%,var(--glow-warm) 0%,var(--clear) 62%),radial-gradient(52% 64% at 5% 100%,var(--glow-warm) 0%,var(--clear) 60%);min-height:calc(100vh - var(--nav-h) - 28px);min-height:calc(100svh - var(--nav-h) - 28px);display:grid;align-content:center}
.stage{position:relative;height:784px;display:grid;place-items:center}
.hero-copy{position:relative;z-index:3;width:min(680px,calc(100% - 48px));display:flex;flex-direction:column;align-items:center;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:9px;min-height:32px;padding:3px 15px 3px 6px;border-radius:var(--r-pill);background:var(--veil);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);font-size:13px;letter-spacing:.04em;margin:0 0 24px}
.eyebrow-mark{width:22px;height:22px;flex-shrink:0;border-radius:var(--r-circle);background:var(--accent-dark);color:var(--white);display:grid;place-items:center}
.eyebrow-mark svg{width:13px;height:13px;display:block}
.hero h1{margin:0 0 22px;font-family:var(--font-display);font-weight:var(--weight-normal);font-size:clamp(30px,3.34vw,48px);line-height:1.16;letter-spacing:-.012em;color:var(--text)}
.hero h1 .title-line{display:block}
.lede{max-width:560px;margin:0 0 32px;font-size:17px;line-height:1.75;text-wrap:balance}
.lede strong{color:var(--text);font-weight:var(--weight-strong)}
.cta{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin:0 0 34px}
.plats{display:flex;align-items:center;justify-content:center;gap:18px}
.plat-label{font-size:13px;color:var(--text-muted);padding-right:18px;border-right:1px solid var(--border);line-height:1;letter-spacing:.04em}
.plat-list{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 18px;list-style:none;margin:0;padding:0}
.plat-list a{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--text);text-decoration:none}
.plat-badge{width:30px;height:30px;border-radius:var(--r-circle);flex-shrink:0;display:grid;place-items:center;background:var(--bg);color:var(--text);box-shadow:inset 0 0 0 1px var(--border);transition:box-shadow var(--ease)}
.plat-badge svg{width:14px;height:14px;display:block}
.plat-list a:hover .plat-badge{box-shadow:inset 0 0 0 1px var(--text-muted)}
.deco{position:absolute;inset:0;z-index:1;pointer-events:none}
.m-duo{display:contents}
.curve{position:absolute;overflow:visible}
.curve path{fill:none;stroke:var(--apricot);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.curve-top{left:calc(50% - 50px);top:80px;width:210px;height:100px}
.curve-left{left:240px;top:480px;width:136px;height:136px}
.curve-right{right:186px;top:398px;width:110px;height:152px}
.il{position:absolute;overflow:hidden;box-shadow:var(--shadow-card)}
.il svg{display:block;width:100%;height:100%}
.il-left{left:0;top:104px;width:300px;height:404px;border-radius:0 var(--r-card) var(--r-card) 0}
.il-router{left:calc(50% + 214px);top:20px;width:316px;height:200px;border-radius:var(--r-card)}
.il-sofa{right:0;top:560px;width:330px;height:200px;border-radius:var(--r-card) 0 0 var(--r-card)}
.fc{position:absolute;background:var(--bg);color:var(--text);border-radius:var(--r-float);box-shadow:var(--shadow-float)}
.fc-title{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:var(--weight-strong);color:var(--text)}
.fc-title .ico{width:15px;height:15px;color:var(--text-muted)}
.fc-sub{left:calc(50% - 262px);top:36px;width:228px;padding:16px}
.fc-sub .fc-title{margin-bottom:12px}
.sub-row{display:flex;align-items:center;gap:8px}
.sub-input{flex:1;min-width:0;height:34px;padding:0 12px;display:flex;align-items:center;border-radius:var(--r-pill);box-shadow:inset 0 0 0 1px var(--border);background:var(--bg);color:var(--text)}
.sub-ph{display:block;width:74%;height:6px;border-radius:var(--r-pill);background:var(--border);color:var(--text)}
.sub-btn{height:34px;padding:0 15px;display:inline-flex;align-items:center;border-radius:var(--r-pill);background:var(--accent);color:var(--white);font-size:13px;font-weight:var(--weight-medium)}
.fc-rules{right:40px;top:286px;width:288px;padding:14px 18px 16px}
.fc-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:10px;margin-bottom:10px;border-bottom:1px solid var(--border)}
.fc-file{font-family:var(--font-mono);font-size:11.5px;color:var(--text-muted)}
.code{margin:0;padding:0;border:0;border-radius:0;background:var(--clear);color:var(--text);font-family:var(--font-mono);font-size:12px;line-height:1.75;white-space:pre}
.code-line{display:block}
.fc-toggles{left:80px;top:604px;width:224px;padding:4px 18px}
.fc-row{display:flex;align-items:center;gap:10px;height:50px;font-size:14px;color:var(--text)}
.fc-row+.fc-row{border-top:1px solid var(--border)}
.fc-ico{width:28px;height:28px;border-radius:var(--r-circle);flex-shrink:0;display:grid;place-items:center;background:var(--bg-panel-2);color:var(--text-muted)}
.fc-ico .ico{width:15px;height:15px}
.sw{position:relative;flex-shrink:0;margin-left:auto;width:34px;height:20px;border-radius:var(--r-pill);background:var(--border);color:var(--text)}
.sw::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:var(--r-circle);background:var(--white);color:var(--text);box-shadow:var(--shadow-knob)}
.sw.is-on{background:var(--accent);color:var(--white)}
.sw.is-on::after{left:16px}
.tag{position:absolute;display:inline-flex;align-items:center;gap:8px;min-height:34px;padding:5px 16px 5px 12px;border-radius:var(--r-pill);background:var(--apricot);color:var(--text);font-size:14px;white-space:nowrap}
.tag .ico{width:16px;height:16px}
.tag-sub{left:calc(50% + 150px);top:150px}
.tag-mode{left:186px;top:470px}
.tag-rules{right:250px;top:538px}
.dl{background:var(--bg);color:var(--text);padding-top:120px;padding-bottom:128px}
.dl-in{max-width:calc(1240px + var(--gutter)*2);padding-inline:var(--gutter);margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 1px minmax(0,1.2fr);gap:72px;align-items:center}
.dl-lead h2{margin:0 0 20px;font-size:var(--heading-size)}
.dl-lead p{margin:0 0 32px;max-width:460px;font-size:16px;line-height:1.8;color:var(--text-muted)}
.dl-lead p a{color:var(--link)}
.dl-rule{align-self:stretch;background:var(--border);color:var(--text)}
.dl-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:40px;list-style:none;margin:0;padding:0}
.dl-grid a{display:flex;align-items:flex-start;gap:16px;padding:24px 0;border-top:1px solid var(--border);text-decoration:none;color:var(--text)}
.dl-grid .plat-badge{width:44px;height:44px}
.dl-grid .plat-badge svg{width:19px;height:19px}
.dl-txt{display:flex;flex-direction:column;gap:6px}
.dl-name{font-size:16px;font-weight:var(--weight-strong)}
.dl-note{font-size:14px;line-height:1.65;color:var(--text-muted)}
@media(min-width:1600px){.topbar-in{max-width:1360px}}
@media(max-width:1360px){
  .il-left{width:260px}.tag-mode{left:150px}.curve-left{left:204px}.fc-toggles{left:48px}.fc-rules{right:24px;width:276px}.il-sofa{width:290px}.tag-rules{right:210px}.curve-right{right:146px}.plat-label{display:none}
}
@media(max-width:1279px){
  .nav{display:none}
  .header-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;top:var(--nav-h);left:0;right:0;padding:20px var(--gutter) 28px;max-height:calc(100vh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;background:var(--bg);color:var(--text);z-index:3;border-top:1px solid var(--border);box-shadow:var(--shadow-card)}
  .mobile-drawer ul{list-style:none;padding:0;margin:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 12px;text-decoration:none;border-bottom:1px solid var(--border)}
  .mobile-drawer a[aria-current="page"]{font-weight:var(--weight-strong)}
  .drawer-languages{margin-top:24px!important}
}
@media(max-width:1240px){
  .hero{min-height:0;display:block}
  .stage{height:auto;display:flex;flex-direction:column;align-items:center;padding:64px 24px 72px}
  .hero-copy{order:1}
  .deco{position:relative;inset:auto;order:2;width:100%;display:flex;justify-content:center;margin-top:56px}
  .deco>:not(.m-duo){display:none}
  .m-duo{display:block;position:relative;width:min(100%,560px)}
  .m-duo .il-router{position:relative;left:auto;top:auto;width:100%;height:auto;aspect-ratio:316/200}
  .m-duo .fc-rules{position:relative;right:auto;top:auto;width:min(288px,92%);margin:-48px 14px 0 auto}
  .dl-in{grid-template-columns:1fr;gap:48px}
  .dl-rule{display:none}
}
@media(max-width:860px){
  :root{--gutter:24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .footer-brand{grid-column:1/-1}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--display-size:clamp(24px,7vw,30px);--heading-size:28px}
  .hero h1{font-size:clamp(24px,7vw,30px)}
  .lede{font-size:15.5px}
  .btn{min-height:48px;padding:10px 22px;font-size:15px}
  .dl{padding-top:80px;padding-bottom:88px}
  .dl-grid{grid-template-columns:1fr}
  .code{font-size:11px}
  .sec{padding-top:72px;padding-bottom:72px}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .tilt,[data-tilt]{transform:none!important}
  .topbar-in{gap:12px}
  .brand{gap:8px}
  .brand-name{font-size:20px}
  .brand img{width:32px;height:32px}
  .header-tools{gap:8px;margin-left:auto}
  .lang{padding-inline:12px}
  .lang-full{display:none}.lang-short{display:inline}
  .stage{padding-inline:20px}
  .hero-copy{width:100%}
  .cta{gap:10px}
  .plat-list{gap:10px 14px}
  .plats{max-width:100%}
  .grid,.footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .hot-links{grid-template-columns:1fr}
  .card,.panel{padding:24px}
  .footer-bottom{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal.reveal-ready{opacity:1;transform:none}
}