:root{color-scheme:dark;--font-display:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;--font-body:"Segoe UI",system-ui,-apple-system,sans-serif}*{box-sizing:border-box}html{overflow-x:clip}body{margin:0;min-height:100%;color:var(--lk-text-primary);background:radial-gradient(920px 460px at 8% -12%,rgba(126,182,201,.16),transparent 58%),radial-gradient(720px 380px at 108% -8%,rgba(196,163,90,.12),transparent 52%),var(--lk-background);font-family:var(--font-body);font-size:16px;line-height:1.65}a,body,button{-webkit-tap-highlight-color:transparent}:focus{outline:none}:focus-visible{outline:2px solid var(--lk-focus);outline-offset:3px}.skip{position:absolute;inset-inline-start:12px;top:-48px;z-index:40;background:var(--lk-primary);color:var(--lk-on-primary);padding:8px 12px;border-radius:var(--lk-radius-sm)}.skip:focus{top:12px}.wrap{width:100%;max-width:1520px;margin-inline:auto;padding-inline:16px}.prose{max-width:720px}.lede,.section-head{max-width:680px}.footer-brand,.wordmark,h1,h2,h3{font-family:var(--font-display);font-weight:600;letter-spacing:-.03em;line-height:1.08}h1{margin:0;font-size:clamp(2.5rem,7vw,4.6rem)}.hero h1{font-size:clamp(2rem,3.15vw,3.35rem)}html[lang=zh-CN] .hero h1{font-size:clamp(2rem,4.5vw,4.15rem)}@media (max-width:767px){html:not([lang=zh-CN]) .hero h1{font-size:1.35rem}}h1 span{display:block}.hero h1 span{white-space:nowrap}.hero h1 .hero-sub{margin-top:.14em;font-size:.74em;font-weight:500;line-height:1.22;letter-spacing:0;color:var(--lk-accent)}h2{margin:0;font-size:clamp(1.7rem,3vw,2.3rem)}h3{margin:0 0 8px;font-size:1.15rem}p{margin:0;color:var(--lk-text-secondary)}a{color:var(--lk-accent);text-decoration-thickness:1px;text-underline-offset:.18em}a:hover{color:var(--lk-text-primary)}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:rgba(11,28,44,.92);border-bottom:1px solid var(--lk-border)}.header-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:72px}.wordmark{display:flex;flex-direction:column;flex:0 1 auto;min-width:0;color:var(--lk-text-primary);text-decoration:none;line-height:1}.wordmark span:first-child{font-size:1.2rem;line-height:1.05}.wordmark span:last-child{margin-top:2px;color:var(--lk-accent);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase}.cta-row,.header-end,.locale-switch{display:flex;align-items:center;gap:8px}.site-nav{display:none}.site-nav.open{display:flex;flex-direction:column;gap:4px;position:absolute;inset-inline:0;top:72px;padding:12px 16px 20px;background:var(--lk-surface);border-bottom:1px solid var(--lk-border)}.site-nav a{color:var(--lk-text-primary);text-decoration:none;min-height:var(--lk-touch);display:inline-flex;align-items:center;padding-inline:10px;border-radius:var(--lk-radius-sm)}.site-nav a[aria-current=page]{color:var(--lk-primary)}.mobile-cta{justify-content:center;margin-top:8px}a.btn.desktop-cta{display:none}.btn,.locale-switch button,.nav-toggle{font:inherit;min-height:var(--lk-touch);border-radius:var(--lk-radius-sm);border:1px solid var(--lk-border);cursor:pointer}.nav-toggle{background:transparent;color:var(--lk-text-primary);width:var(--lk-touch);padding:0;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto}.nav-bars{width:18px;height:2px;background:currentColor;box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor}.btn{display:inline-flex;align-items:center;justify-content:center;padding:0 16px;text-decoration:none;font-weight:600}.btn-primary{background:var(--lk-primary);color:var(--lk-on-primary);border-color:transparent}.btn-primary:hover{background:var(--lk-primary-hover);color:var(--lk-on-primary)}.btn-primary:active{background:color-mix(in srgb,var(--lk-primary) 78%,var(--lk-background));color:var(--lk-on-primary)}.btn:focus-visible{outline:2px solid var(--lk-focus);outline-offset:3px}.locale-switch button{background:transparent;color:var(--lk-text-secondary);padding-inline:10px}.locale-switch button[aria-pressed=true]{color:var(--lk-on-primary);background:var(--lk-primary);border-color:transparent}main,main:focus{outline:none}.hero,.page-hero{padding-block:32px 8px}.hero{display:grid;grid-gap:28px;gap:28px}.preview{display:grid;grid-gap:16px;gap:16px;padding:18px;border-radius:var(--lk-radius-lg);border:1px solid var(--lk-border-strong);background:linear-gradient(180deg,rgba(126,182,201,.12),transparent 42%),var(--lk-surface)}.preview h2{font-size:1.6rem}.preview-frame{display:grid;grid-template-columns:92px minmax(0,1fr);grid-template-rows:28px minmax(0,1fr);grid-gap:8px 10px;gap:8px 10px;min-height:156px;max-height:176px;padding:10px;border-radius:14px;overflow:hidden;background:rgba(8,16,24,.42);border:1px solid var(--lk-border)}.preview-top{grid-column:1/-1;display:flex;align-items:center;gap:8px;padding-inline:2px}.preview-dot{width:8px;background:var(--lk-accent);box-shadow:0 0 0 3px rgba(126,182,201,.16)}.preview-chip,.preview-dot{height:8px;border-radius:99px}.preview-chip{width:42%;background:rgba(244,241,234,.22)}.preview-rail,.preview-thread{display:grid;align-content:start;grid-gap:7px;gap:7px;min-width:0}.preview-bar,.preview-compose,.preview-rail span{display:block;height:10px;border-radius:999px;background:rgba(183,196,209,.28)}.preview-rail span{height:22px;border-radius:8px;background:linear-gradient(90deg,rgba(126,182,201,.55) 0 8px,transparent 8px),rgba(183,196,209,.16);border:1px solid rgba(183,196,209,.18)}.preview-rail span:first-child{background:linear-gradient(90deg,var(--lk-primary) 0 8px,transparent 8px),rgba(196,163,90,.16);border-color:rgba(196,163,90,.35)}.preview-bar{width:78%}.preview-bar.reply{width:64%;-webkit-margin-start:auto;margin-inline-start:auto;background:rgba(126,182,201,.38)}.preview-bar.short{width:46%}.preview-compose{height:26px;margin-top:4px;border-radius:10px;background:transparent;border:1px solid rgba(183,196,209,.35)}.badge,.eyebrow{margin:0 0 12px;color:var(--lk-accent);font-size:.78rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase}.lede{font-size:1.05rem;margin-top:16px}.cta-row{margin-top:24px}.status-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}.fine,.status-row li{color:var(--lk-text-muted);font-size:.92rem}.status-row li{border:1px solid var(--lk-border);border-radius:999px;padding:6px 12px}.section{padding-block:36px}.section-head{margin-bottom:22px}.section-head .lede{margin-top:10px}.caps,.grid-2,.grid-4,.plain-list,.platform-grid,.stack{margin:0;padding:0;list-style:none}.grid-2,.grid-4{display:grid;grid-gap:14px;gap:14px}.grid-2,.grid-4{grid-template-columns:1fr}.stack{display:grid;grid-gap:12px;gap:12px}.card{background:linear-gradient(180deg,rgba(126,182,201,.1),transparent 46%),var(--lk-surface);border:1px solid var(--lk-border-strong);border-radius:var(--lk-radius-lg);padding:20px;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.card p{margin-top:8px}.value-icon{display:grid;place-items:center;width:36px;height:36px;margin-bottom:14px;border-radius:10px;color:var(--lk-accent);background:rgba(126,182,201,.1);border:1px solid rgba(196,163,90,.35)}.value-icon svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}@media (hover:hover){.feature-card:hover,.preview:hover,.value-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--lk-accent) 45%,var(--lk-border-strong));box-shadow:0 14px 28px rgba(8,16,24,.22)}}.caps{display:flex;flex-wrap:wrap;gap:8px}.caps li{border:1px solid var(--lk-border-strong);border-radius:999px;padding:8px 12px;color:var(--lk-text-primary)}.plain-list{display:grid;grid-gap:10px;gap:10px;max-width:720px}.plain-list li{-webkit-padding-start:14px;padding-inline-start:14px;-webkit-border-start:2px solid var(--lk-primary);border-inline-start:2px solid var(--lk-primary);color:var(--lk-text-secondary)}.callout{margin:18px 0;padding:16px 18px;border-radius:var(--lk-radius-md);border:1px solid var(--lk-border-strong);background:var(--lk-surface-elevated);color:var(--lk-text-primary)}.callout h2{font-size:1.25rem;margin-bottom:8px}.fine{margin-top:14px}.text-link{font-weight:600}.article{display:grid;grid-gap:28px;gap:28px;padding-bottom:28px}.article h2{font-size:1.35rem;margin-bottom:8px}.article p+p{margin-top:10px}.email-line{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;margin:8px 0 36px;color:var(--lk-text-primary)}.site-footer{border-top:1px solid var(--lk-border);padding-block:28px 36px;margin-top:12px}.footer-grid{display:grid;grid-gap:18px;gap:18px}.footer-brand{margin:0 0 8px;font-size:1.3rem;color:var(--lk-text-primary)}.site-footer nav{display:flex;flex-wrap:wrap;gap:8px 16px}.site-footer nav a{color:var(--lk-text-secondary);text-decoration:none;min-height:var(--lk-touch);display:inline-flex;align-items:center}@media (max-width:767px){.cta-row .btn,.preview .btn{width:100%}}@media (min-width:768px){.grid-2,.grid-4{grid-template-columns:1fr 1fr}.hero{padding-top:56px}.section{padding-block:56px}}@media (min-width:1024px){.wrap{padding-inline:32px}.hero{grid-template-columns:minmax(0,1.15fr) minmax(380px,.85fr);align-items:center;gap:48px}.grid-2{grid-template-columns:repeat(3,minmax(0,1fr))}.preview-frame{min-height:220px;max-height:236px}}@media (min-width:1100px){.header-bar{display:grid;grid-template-columns:auto 1fr auto}.site-nav,.site-nav.open{display:flex;flex-direction:row;align-items:center;justify-content:center;position:static;padding:0;background:transparent;border:0}a.btn.mobile-cta{display:none}a.btn.desktop-cta{display:inline-flex}.nav-toggle{display:none}.footer-grid{grid-template-columns:1.4fr 1.4fr auto;align-items:start}}@media (min-width:1440px){.wrap{padding-inline:48px}.grid-2,.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.hero{padding-top:72px}.section{padding-block:64px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}