:root {
  --bg:#F6EEE2;
  --bg-top:#FBF6EE;
  --bg-bottom:#F2E8D8;
  --panel:#FFFBF4;
  --panel-2:#EFE4D3;
  --panel-3:#FAF3E8;
  --border:#E2D4BF;
  --accent:#D6402C;
  --accent-dark:#A92E1F;
  --text:#2A1F18;
  --muted:#6E5D50;
  --success:#2F8A57;
  --warn:#C98A12;
  --error:#B3261E;
  --umber-top:#3A2A22;
  --umber-bottom:#22190F;
  --hill-far:#4A3328;
  --hill-mid:#5A3D2E;
  --hill-near:#2E221B;
  --chrome:#2A211C;
  --cream:#F3E6D2;
  --cream-72:rgba(243,230,210,.72);
  --cream-48:rgba(243,230,210,.48);
  --cream-22:rgba(243,230,210,.22);
  --cream-14:rgba(243,230,210,.14);
  --cream-08:rgba(243,230,210,.08);
  --accent-soft:rgba(214,64,44,.10);
  --accent-halo:rgba(214,64,44,.06);
  --accent-shadow:rgba(214,64,44,.12);
  --accent-shadow-strong:rgba(169,46,31,.34);
  --umber-shadow:rgba(58,36,22,.32);
  --ink-shadow:rgba(42,31,24,.16);
  --ink-edge:rgba(42,31,24,.22);
  --hi:rgba(255,255,255,.92);
  --hi-soft:rgba(255,255,255,.26);
  --glass:rgba(42,31,24,.64);
  --glass-edge:rgba(255,251,244,.18);
  --glow:rgba(255,206,160,.20);
  --sea-glint:rgba(243,230,210,.12);
  --tl-red:#E0645A;
  --tl-yellow:#E2B042;
  --tl-green:#5DAE6A;
  --flag-red:#D22F37;
  --flag-white:#FFFFFF;
  --flag-blue:#223C80;
  --flag-navy:#1A2F6B;
  --flag-edge:rgba(42,31,24,.16);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .16 0 0 0 0 .12 0 0 0 0 .09 0 0 0 .95 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --f-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Apple SD Gothic Neo','Microsoft YaHei',sans-serif;
  --f-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Yu Gothic','Apple SD Gothic Neo','Malgun Gothic','Microsoft YaHei',sans-serif;
  --f-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,monospace;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:20px;
  --r-xl:28px;
  --r-pill:999px;
  --gutter:clamp(20px,4.2vw,60px);
  --content-width:1320px;
  --header-height:72px;
  --toc-height:56px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 16px)}
html.nav-open{overflow:hidden}
body{margin:0;min-width:0;font-family:var(--f-body);font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::after{content:"";position:fixed;inset:0;background-image:var(--grain);opacity:.03;pointer-events:none;z-index:100}
a{color:inherit}
button,input,select{font:inherit}
button{cursor:pointer}
img,svg{max-width:100%}
img{display:block}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
p,h1,h2,h3,h4,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--f-display);line-height:1.18;letter-spacing:-.02em;text-wrap:balance}
h1{font-weight:900;font-size:clamp(52px,4.45vw,68px)}
h2{font-weight:900;font-size:clamp(30px,3.3vw,44px)}
h3{font-weight:800;font-size:clamp(21px,2.2vw,28px)}
p+p{margin-top:1em}
strong{font-weight:700}
code,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
pre code{overflow-wrap:normal}
table{border-collapse:collapse}
th,td{word-break:keep-all}
:where(a,button,summary,[role="tab"],select,input):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.no-break{white-space:nowrap}
.kw{font-style:normal;color:var(--accent)}
.wrap{width:100%;max-width:calc(var(--content-width) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:80px;padding-bottom:80px}
.sec-heading{max-width:720px;margin-bottom:32px}
.sec-heading p{margin-top:16px;color:var(--muted)}
.surface{background:var(--panel);border-radius:var(--r-md);box-shadow:inset 0 1px 0 var(--hi),0 0 0 1px var(--border),0 18px 36px -24px var(--accent-shadow-strong)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 30px;border:0;border-radius:var(--r-pill);font-size:16px;font-weight:700;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform .2s ease,box-shadow .2s ease}
.btn:hover{transform:translateY(-2px)}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:var(--panel);box-shadow:inset 0 1px 0 var(--hi-soft),0 14px 28px -10px var(--accent-shadow-strong)}
.btn-soft,.btn-secondary{background:var(--panel-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;transform:none}
.text-link{display:inline-flex;align-items:center;gap:6px;min-height:28px;color:var(--accent);font-weight:700;text-decoration:none}
.text-link:hover{text-decoration:underline}
.tag,.badge{display:inline-flex;align-items:center;gap:8px;max-width:100%;min-height:30px;padding:4px 14px;border-radius:var(--r-pill);background:var(--accent-soft);color:var(--accent);font-size:13px;font-weight:700;line-height:1.3;overflow:hidden}
.tag-dot{width:6px;height:6px;flex:none;border-radius:50%;background:var(--accent)}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;max-width:100%;overflow:hidden;margin-bottom:24px}
#server-status + *{margin-top:24px}
body:has(.toc-tabs) section[id]{scroll-margin-top:calc(var(--header-height) + var(--toc-height) + 24px)}
.ico{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* Shared header. The four direct children remain siblings at every breakpoint. */
.topbar{position:relative;z-index:30}
.topbar-in{display:flex;align-items:center;min-height:var(--header-height);gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;text-decoration:none}
.brand-mark{width:32px;height:32px;filter:drop-shadow(0 4px 8px var(--accent-shadow))}
.brand-en{font-family:var(--f-display);font-size:20px;font-weight:900;letter-spacing:-.02em}
.brand-zh{padding-left:10px;border-left:1px solid var(--border);font-size:14px;font-weight:500;color:var(--muted);line-height:1}
.nav{margin-left:auto}
.nav ul{display:flex;align-items:center;gap:2px;list-style:none;margin-block:0;padding:0}
.nav a{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 10px;border-radius:var(--r-pill);color:var(--muted);font-size:13px;font-weight:600;text-decoration:none;white-space:nowrap}
.nav a:hover{color:var(--text);background:var(--panel-3)}
.nav a[aria-current="page"]{color:var(--text);background:var(--panel);box-shadow:inset 0 0 0 1px var(--border),0 4px 12px -8px var(--ink-shadow)}
.nav svg{width:16px;height:16px}
.nav-end{display:flex;align-items:center;gap:10px;padding-left:16px;border-left:1px solid var(--border);flex:none}
.lang-box{position:relative}
.lang-toggle{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;min-width:44px;width:auto;padding:0 6px;border:0;background:transparent;color:var(--muted);font-size:13px;font-weight:600;white-space:nowrap}
.lang-toggle svg{width:16px;height:16px}
.lang-toggle span{white-space:nowrap}
.lang-list{display:none;position:absolute;right:0;top:100%;min-width:160px;padding:6px;background:var(--panel);border-radius:var(--r-md);box-shadow:0 18px 34px -18px var(--umber-shadow),inset 0 0 0 1px var(--border);z-index:35}
.lang-box.is-open .lang-list{display:block}
.lang-list a{display:flex;align-items:center;min-height:40px;padding:7px 12px;border-radius:var(--r-sm);font-size:13px;text-decoration:none;white-space:nowrap}
.lang-list a:hover,.lang-list a[aria-current="true"]{background:var(--accent-soft);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:38px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:14px;font-weight:700;text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-soft),0 6px 14px -8px var(--ink-shadow)}
.login svg{width:15px;height:15px}
.hamburger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:0;border-radius:var(--r-sm);background:var(--panel-2);color:var(--text)}
.hamburger svg{width:22px;height:22px}
.mobile-drawer{display:none}
.menu-veil{display:none}

/* Shared footer */
.site-footer{padding-top:64px;background:var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;padding-bottom:48px}
.footer-brand p{max-width:300px;margin-top:16px;color:var(--muted);font-size:14px}
.footer-col h2{margin-bottom:14px;font-size:15px;letter-spacing:0}
.footer-col a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:14px;text-decoration:none}
.footer-col a:hover{color:var(--accent)}
.footer-col li+li{margin-top:5px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:20px;padding-bottom:24px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}
.footer-bottom a{min-height:24px;margin-left:18px;text-decoration:none}

/* Client illustration geometry is scaled as a single static object. */
.first{position:relative;max-width:100%;overflow-x:clip;background:radial-gradient(ellipse 46% 52% at 76% 52%,var(--accent-halo),transparent 72%),linear-gradient(180deg,var(--bg-top),var(--bg-bottom))}
.hero{position:relative;padding-top:56px;padding-bottom:72px}
.hero-grid{display:grid;grid-template-columns:560px 1fr;align-items:center;gap:56px}
.hero-grid>*{min-width:0}
.copy{position:relative;z-index:2}
.h1{margin-top:24px;font-family:var(--f-display);font-size:clamp(52px,4.45vw,64px);font-weight:900;line-height:1.1;letter-spacing:-.02em}
.h1-line{display:block}
.cta-row{display:flex;align-items:center;gap:16px;margin-top:32px}
.refund-link{display:inline-flex;align-items:center;gap:6px;min-height:28px;margin-top:16px;color:var(--accent);font-size:15px;font-weight:700;text-decoration:none}
.lede{max-width:540px;margin-top:24px;color:var(--muted);font-size:16px;line-height:1.65}
.lede strong{color:var(--text)}
.trust{display:flex;flex-wrap:wrap;align-items:center;row-gap:8px;margin-top:24px;padding-top:16px;border-top:1px solid var(--border);font-size:13.5px;font-weight:600;line-height:22px}
.trust li{display:inline-flex;align-items:center;white-space:nowrap}
.trust li+li::before{content:"";width:4px;height:4px;flex:none;margin:0 11px;border-radius:50%;background:var(--muted);opacity:.45}
.meta-row{display:flex;align-items:center;margin-top:16px}
.trust+.meta-row{margin-top:24px}
.meta-label{flex:none;width:64px;color:var(--muted);font-size:12px;font-weight:600}
.meta-row ul{display:flex;align-items:center;flex-wrap:wrap;gap:14px}
.meta-row li{display:inline-flex;align-items:center;gap:6px;white-space:nowrap;font-size:13px;font-weight:500;line-height:24px}
.pf-ico{width:18px;height:18px;color:var(--text)}
.flag{display:block;width:24px;height:16px;flex:none;filter:drop-shadow(0 1px 1px var(--ink-shadow))}
.f-red{fill:var(--flag-red)}.f-white{fill:var(--flag-white)}.f-blue{fill:var(--flag-blue)}.f-navy{fill:var(--flag-navy)}.f-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
.uk-wd{fill:none;stroke:var(--flag-white);stroke-width:4}.uk-rd{fill:none;stroke:var(--flag-red);stroke-width:1.4}.uk-wc{fill:none;stroke:var(--flag-white);stroke-width:6.4}.uk-rc{fill:none;stroke:var(--flag-red);stroke-width:3.6}
.device-slot{--s:1;position:relative;width:calc(704px * var(--s));height:calc(612px * var(--s));justify-self:end}
.device{position:absolute;left:0;top:calc(24px * var(--s));width:704px;height:588px;transform-origin:top left;transform:rotate(2deg) scale(var(--s))}
.stage{position:absolute;inset:0;overflow:hidden;border-radius:var(--r-lg);background:linear-gradient(165deg,var(--umber-top),var(--umber-bottom));box-shadow:0 44px 80px -34px var(--umber-shadow),0 18px 36px -20px var(--umber-shadow),inset 0 1px 0 var(--cream-14)}
.stage::before{content:"";position:absolute;inset:-18% -8% 38% 36%;background:radial-gradient(closest-side,var(--glow),transparent)}
.hills{position:absolute;left:0;bottom:0;width:704px;height:240px}
.h-far{fill:var(--hill-far)}.h-mid{fill:var(--hill-mid)}.h-near{fill:var(--hill-near)}.h-glint{fill:none;stroke:var(--sea-glint);stroke-width:2;stroke-linecap:round}
.win{position:absolute;left:36px;top:40px;width:612px;height:452px;border-radius:var(--r-md);background:var(--panel);box-shadow:inset 0 1px 0 var(--hi),0 0 0 1px var(--ink-edge),0 48px 90px -24px var(--accent-shadow),0 22px 44px -22px var(--umber-shadow)}
.win-top{position:relative;z-index:3;height:52px;padding:10px 12px}
.capsule{display:flex;align-items:center;gap:4px;height:32px;padding:0 4px 0 12px;border-radius:var(--r-pill);background:var(--chrome);box-shadow:inset 0 1px 0 var(--cream-08),0 6px 14px -8px var(--umber-shadow)}
.lights{display:flex;gap:6px;margin-right:6px}.lights i{display:block;width:10px;height:10px;border-radius:50%}.lights .l1{background:var(--tl-red)}.lights .l2{background:var(--tl-yellow)}.lights .l3{background:var(--tl-green)}
.cap-div{width:1px;height:16px;margin:0 6px;background:var(--cream-22)}
.tool{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:30px;height:24px;border-radius:var(--r-pill);color:var(--cream-72);font-size:12px;font-weight:600}
.tool svg{width:15px;height:15px}.tool.is-on{padding:0 10px 0 8px;background:var(--cream-14);color:var(--cream)}
.cap-title{flex:1;text-align:center;font-family:var(--f-mono);font-size:11px;letter-spacing:.06em;color:var(--cream-48)}
.connect{position:relative;display:inline-flex;align-items:center;gap:5px;height:24px;padding:0 13px 0 10px;border-radius:var(--r-pill);background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:var(--panel);font-size:12px;font-weight:700;box-shadow:inset 0 1px 0 var(--hi-soft)}
.connect svg{width:12px;height:12px}
.win-body{display:grid;grid-template-columns:244px 1fr;height:364px;border-top:1px solid var(--border)}
.routes{padding:12px;border-right:1px solid var(--border);background:var(--panel-3)}
.routes-head{display:flex;align-items:center;justify-content:space-between;height:26px;padding:0 6px;margin-bottom:2px;color:var(--muted);font-size:11px;font-weight:600}
.route{display:flex;align-items:center;gap:9px;height:42px;padding:0 10px;border-radius:var(--r-sm);font-size:13px;white-space:nowrap}
.route+.route{margin-top:4px}.route .flag{width:21px;height:14px}.route b{font-weight:700}.route small{color:var(--muted);font-size:12px}
.route.is-on{position:relative;background:var(--panel);box-shadow:0 0 0 1px var(--border),0 6px 14px -10px var(--accent-shadow-strong)}
.detail{padding:14px 16px}
.card{padding:14px 16px;border-radius:10px;background:var(--panel);box-shadow:inset 0 0 0 1px var(--border),0 12px 24px -16px var(--accent-shadow-strong)}
.card-head{display:flex;align-items:center;gap:10px;height:40px}.card-head .flag{width:27px;height:18px}
.card-title{font-family:var(--f-display);font-size:16px;font-weight:800;line-height:1.2}.card-sub{color:var(--muted);font-size:11px}
.sub-label{margin-top:12px;color:var(--muted);font-size:11px;font-weight:600}
.chips{display:flex;gap:6px;margin-top:6px}
.chip{display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:var(--r-pill);background:var(--panel-3);box-shadow:inset 0 0 0 1px var(--border);font-family:var(--f-mono);font-size:12px}
.chip.is-on{background:var(--text);color:var(--panel);box-shadow:none}
.kvs{margin-top:12px}.kv{display:flex;align-items:center;justify-content:space-between;height:34px;border-top:1px solid var(--border);font-size:12.5px}.kv span{color:var(--muted)}.kv b{font-size:13px}.kv .mono{font-family:var(--f-mono);font-size:12.5px}
.switch-row{display:flex;align-items:center;gap:8px;height:40px;margin-top:10px;padding:0 12px;border-radius:var(--r-sm);background:var(--panel-3);box-shadow:inset 0 0 0 1px var(--border)}
.switch-row svg{width:16px;height:16px;color:var(--success)}.switch-row b{font-size:13px}.switch-row em{margin-left:auto;color:var(--success);font-size:12px;font-style:normal;font-weight:600}
.tog{position:relative;width:34px;height:20px;border-radius:var(--r-pill);background:var(--success)}.tog::after{content:"";position:absolute;top:2px;right:2px;width:16px;height:16px;border-radius:50%;background:var(--panel);box-shadow:0 1px 3px var(--ink-shadow)}
.win-foot{display:flex;align-items:center;justify-content:center;gap:8px;height:36px;padding-left:150px;border-top:1px solid var(--border);color:var(--muted);font-size:12px}
.drop-ico{display:inline-grid;place-items:center;width:22px;height:18px;border:1px dashed var(--muted);border-radius:5px}.drop-ico svg{width:12px;height:12px}
.anno{position:absolute;z-index:4;pointer-events:none}.anno-line{fill:none;stroke:var(--accent);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.anno-ring{left:-8px;top:-9px;width:236px;height:60px;overflow:visible}
.anno-tag{display:inline-flex;align-items:center;gap:5px;height:22px;padding:0 9px;border-radius:var(--r-xs);background:var(--accent-dark);color:var(--panel);font-size:11px;font-weight:700;white-space:nowrap;box-shadow:0 6px 12px -6px var(--accent-shadow-strong)}
.anno-tag i{display:block;width:5px;height:5px;border-radius:50%;background:var(--panel)}
.anno-exit{right:-16px;top:50%;transform:translateY(-50%) rotate(-3deg)}
.anno-arrow{top:calc(100% + 2px);right:4px;width:60px;height:40px;overflow:visible}.anno-connect{top:calc(100% + 36px);right:40px;transform:rotate(-2deg)}
.anno-under{position:relative;display:inline-block}.anno-under svg{position:absolute;left:-4px;bottom:-7px;width:calc(100% + 8px);height:8px;overflow:visible}
.quick{position:absolute;z-index:5;left:-12px;top:420px;width:172px;padding:10px;border-radius:var(--r-md);background:var(--glass);-webkit-backdrop-filter:blur(14px) saturate(1.2);backdrop-filter:blur(14px) saturate(1.2);box-shadow:inset 0 0 0 1px var(--glass-edge),inset 0 1px 0 var(--cream-14),0 22px 40px -18px var(--umber-shadow)}
.quick-top{display:flex;align-items:center;justify-content:space-between;height:18px;color:var(--cream-72)}.quick-top svg{width:13px;height:13px}.quick-top span{color:var(--cream-48);font-size:10.5px;font-weight:600}
.qbtn{display:flex;align-items:center;justify-content:center;gap:6px;height:30px;margin-top:8px;border-radius:var(--r-pill);background:var(--cream);color:var(--text);font-size:12px;font-weight:700;box-shadow:inset 0 1px 0 var(--hi)}.qbtn+.qbtn{margin-top:6px}.qbtn svg{width:13px;height:13px}
.cover-card{position:absolute;z-index:5;top:-22px;right:-14px;display:flex;align-items:center;gap:10px;padding:10px 14px 10px 10px;border-radius:var(--r-md);background:var(--panel);box-shadow:inset 0 1px 0 var(--hi),0 0 0 1px var(--border),0 18px 36px -16px var(--accent-shadow-strong)}
.cover-ico{display:grid;place-items:center;width:36px;height:36px;border-radius:var(--r-sm);background:var(--panel-2)}.cover-ico svg{width:20px;height:20px}
.cover-card small{display:block;color:var(--muted);font-size:11px}.cover-card b{display:block;font-family:var(--f-display);font-size:14px;font-weight:800;white-space:nowrap}
.plat-pill{position:absolute;z-index:2;right:22px;bottom:22px;display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:var(--r-pill);background:var(--cream-14);color:var(--cream);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:inset 0 0 0 1px var(--glass-edge);font-size:12px;font-weight:600;white-space:nowrap}
.peek{padding-bottom:80px}.board{position:relative;min-height:360px;overflow:hidden;padding:72px 64px;border-radius:var(--r-xl);background:var(--panel-2);box-shadow:inset 0 1px 0 var(--hi-soft)}
.h2{max-width:640px;font-family:var(--f-display);font-size:44px;font-weight:900;line-height:1.15}
.tile{position:absolute;display:grid;place-items:center;width:72px;height:72px;border-radius:var(--r-md);background:var(--panel);box-shadow:inset 0 1px 0 var(--hi),0 14px 28px -16px var(--accent-shadow-strong)}.tile svg{width:30px;height:30px}.tile-a{top:20px;right:152px}.tile-b{top:108px;right:64px;opacity:.4}

@media(max-width:1399px){.device-slot{--s:.84}}
@media(max-width:1239px){.hero-grid{grid-template-columns:1fr;gap:48px}.copy{max-width:560px}.device-slot{--s:.9;justify-self:center}}
@media(max-width:1080px){
  .nav{display:none}
  .nav-end{margin-left:auto;border-left:0}
  .hamburger{display:inline-flex}
  .mobile-drawer{position:absolute;z-index:32;top:var(--header-height);left:var(--gutter);right:var(--gutter);display:none;max-height:calc(100dvh - var(--header-height) - 12px);overflow-y:auto;overscroll-behavior:contain;padding:10px;border-radius:var(--r-md);background:var(--panel);box-shadow:0 22px 46px -16px var(--umber-shadow),inset 0 0 0 1px var(--border)}
  .topbar.menu-open .mobile-drawer{display:block}
  .mobile-drawer ul{display:block}
  .mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:10px 14px;border-radius:var(--r-sm);text-decoration:none;font-weight:600}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}
  .mobile-drawer svg{width:18px;height:18px}
  .drawer-languages{margin-top:8px;padding-top:8px;border-top:1px solid var(--border)}
  .menu-veil{position:fixed;z-index:20;inset:var(--header-height) 0 0;background:var(--glass)}
  .topbar.menu-open .menu-veil{display:block}
}
@media(max-width:768px){
  :root{--gutter:20px}
  .hero{padding-top:40px}
  .h1,h1{font-size:clamp(28px,9vw,40px)}
  .device-slot{--s:.72}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .board{padding:48px 32px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .hero-grid{gap:34px}
  .cta-row{flex-wrap:wrap}
  .trust li{white-space:normal}
  .meta-row{align-items:flex-start}
  .device-slot{--s:.46}
  .device{transform:scale(var(--s))}
  .h2{font-size:30px}
  .board{padding:48px 24px}
  .tile{opacity:.25}
  .brand-zh{display:none}
  .lang-toggle span{display:none}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .footer-bottom a{margin-left:0;margin-right:18px}
  .sec{padding-top:56px;padding-bottom:56px}
}
@media(max-width:390px){
  :root{--gutter:16px}
  .topbar-in{gap:8px}
  .nav-end{gap:4px;padding-left:0}
  .login{padding-inline:12px}
  .device-slot{--s:.40}
  .meta-row ul{gap:8px}
  .footer-grid{gap:22px}
}
@media(max-width:350px){.device-slot{--s:.35}.brand-en{font-size:18px}.login{padding-inline:10px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  .btn{transition:none}
}