@font-face{font-family:DM Sans;src:url('/font.woff2') format('woff2');font-style:normal;font-weight:100 900;font-display:swap}
:root{--paper:#f6f5f0;--white:#fffefa;--ink:#20352d;--muted:#5e6c64;--green:#245a45;--line:#d9ded6;--wash:#e9eee5;--danger:#963d2f;color-scheme:light;font-family:'DM Sans','PingFang SC','Microsoft YaHei',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;font-size:16px;line-height:1.65}a{color:inherit;text-underline-offset:5px}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.65}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #527c58;outline-offset:4px}::selection{background:#cfe2ca;color:#163824}input,textarea{caret-color:var(--green)}html{scrollbar-color:#809581 var(--paper)}svg{width:22px;height:22px;flex-shrink:0}h1,h2,h3,p{margin-top:0}h1{font-weight:520;font-size:clamp(36px,5vw,62px);line-height:1.12;letter-spacing:-.035em;margin-bottom:24px;text-wrap:balance}h2{font-size:21px;font-weight:600;line-height:1.4;margin-bottom:12px;letter-spacing:-.015em}h3{font-size:20px;font-weight:550}p{max-width:68ch;margin-bottom:20px}small,.fine{font-size:13px;line-height:1.7;color:var(--muted)}.muted{color:var(--muted);font-size:14px}.lead{font-size:20px;line-height:1.6;color:#526359}.header,.footer{max-width:1248px;margin:auto;padding:28px 40px;display:flex;justify-content:space-between;align-items:center;gap:24px}.header{border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:24px;letter-spacing:-.03em;font-weight:650}.brand svg{width:34px;height:34px;color:var(--green)}.brand-zh{font-size:13px;font-weight:400;letter-spacing:0;margin-left:10px;color:var(--muted)}nav{display:flex;align-items:center;gap:25px;font-size:14px}nav a{text-decoration:none;min-height:44px;display:inline-flex;align-items:center}.language{font-weight:550}.footer{font-size:12px;color:var(--muted);border-top:1px solid var(--line);margin-top:60px}.footer div{display:flex;gap:22px}.footer a{text-decoration:none}.home{max-width:1200px;margin:0 auto;padding:84px 40px 0;display:grid;grid-template-columns:1.18fr 1fr;gap:56px 84px;align-items:start}.intro{padding-top:30px}.intro>p:not(.lead){color:var(--muted)}.home-actions{display:flex;flex-wrap:wrap;align-items:center;gap:24px;margin-top:36px}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;background:var(--green);color:white;border:1px solid transparent;padding:13px 21px;min-height:49px;border-radius:8px;text-decoration:none;font-weight:550;font-size:15px;line-height:1.5;transition:background .16s ease-out,box-shadow .16s ease-out}.button:hover{background:#163e2e}.button.secondary{background:transparent;color:var(--ink);border-color:#b8c5b8}.button.secondary:hover{background:var(--wash)}.button.danger{background:transparent;color:var(--danger);border-color:#d3bdb5}.button.danger:hover{background:#f5e7e1}.button.full{width:100%}.text-link{display:inline-flex;align-items:center;gap:10px;font-size:14px;font-weight:550}.paper{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:32px}.paper-top{display:flex;align-items:center;gap:12px;font-size:14px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:28px}.paper-top svg{color:var(--green)}.steps{list-style:none;margin:0;padding:0}.steps li{display:flex;align-items:flex-start;gap:20px;margin-bottom:30px}.steps li>span{border:1px solid #bdcbbd;border-radius:50%;min-width:31px;height:31px;display:grid;place-items:center;font-size:13px;font-variant-numeric:tabular-nums}.steps h2{font-size:17px;margin-bottom:6px}.steps p{font-size:14px;color:var(--muted);margin-bottom:0}.paper-note{margin-bottom:0;padding-top:22px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.principles{grid-column:1/-1;display:flex;justify-content:space-between;gap:25px;padding:30px 0 0;border-top:1px solid var(--line)}.principles p{display:flex;align-items:center;gap:10px;font-size:14px;margin-bottom:0}.principles svg{width:17px;color:var(--green)}.narrow{max-width:584px;margin:64px auto 80px;padding:0 28px;min-height:48vh}.narrow h1{font-size:44px}.narrow .lead{font-size:18px}.auth-symbol,.success-symbol{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:var(--wash);color:var(--green);margin-bottom:28px}.auth-symbol svg,.success-symbol svg{width:30px;height:30px}.account{margin:30px 0;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:4px}.account span{font-size:13px;color:var(--muted)}.account strong{font-size:20px;overflow-wrap:anywhere;font-weight:550}.plain-list{list-style:none;padding:0;margin:26px 0 30px}.plain-list li{display:flex;gap:10px;align-items:flex-start;font-size:14px;margin:12px 0}.plain-list svg{width:17px;height:24px;color:var(--green)}.narrow .fine{margin-top:16px}.receipt{padding:24px 0;margin:28px 0;border-block:1px solid var(--line);display:flex;flex-direction:column}.receipt span{color:var(--muted);font-size:14px}.success-symbol{animation:confirm-in .4s cubic-bezier(.16,1,.3,1)}@keyframes confirm-in{from{box-shadow:0 0 0 12px transparent}to{box-shadow:0 0 0 0 transparent}}.success>.muted{margin-top:20px}.admin{max-width:1200px;padding:52px 40px 20px;margin:auto;min-height:60vh}.page-head{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:42px}.page-head h1{font-size:40px;margin-bottom:12px}.page-head p{margin-bottom:0;color:var(--muted)}.page-head>form{display:flex;flex-direction:column;align-items:flex-end}.text-button{background:none;border:0;color:var(--ink);min-height:44px;padding:0 8px;text-decoration:underline;text-underline-offset:5px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:50px}.section-title{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:15px}.section-title h2{margin:0}.section-title>span{font-size:13px;color:var(--muted)}.setup{padding-left:30px;border-left:1px solid var(--line)}.setup>p{font-size:14px;color:var(--muted)}.stack{display:flex;flex-direction:column;gap:20px}.stack .button{width:100%}label{display:flex;flex-direction:column;gap:8px;font-size:14px;font-weight:550}input,textarea{width:100%;border:1px solid #bcc7bc;border-radius:7px;padding:12px 14px;color:var(--ink);background:var(--white);font-size:16px;line-height:1.5;min-height:48px}input::placeholder,textarea::placeholder{color:#647167;font-size:14px}textarea{resize:vertical;overflow-wrap:anywhere}input[readonly],textarea[readonly]{background:#eef1e9}.setup .fine{margin-top:22px}.customer-list{padding:0;list-style:none;margin:0}.customer-list li>a{display:flex;gap:22px;align-items:center;padding:22px 4px;border-bottom:1px solid var(--line);text-decoration:none}.customer-list li>a:hover{background:#edf0e8}.customer-list li>a>div{flex:1;min-width:0}.customer-list strong{display:block;font-size:16px;font-weight:550}.customer-list div>span{font-size:14px;color:var(--muted);overflow-wrap:anywhere}.customer-list svg{width:18px;color:#647567}.status{font-size:12px;border-radius:5px;padding:5px 9px;white-space:nowrap;background:#ebe8dd;color:#635829}.status.active{background:#e0ecdd;color:#285232}.status.paused{background:#ece5df;color:#734b38}.empty{padding:50px 12px}.empty p{font-size:15px;color:var(--muted);max-width:44ch}.back{display:inline-block;font-size:14px;color:var(--muted);margin-bottom:30px;min-height:32px}.next-step{border-top:1px solid var(--line);padding-top:28px;margin-top:40px}.next-step h2{font-size:18px}.next-step p{font-size:15px;color:var(--muted)}.narrow label{margin-bottom:20px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.actions form{margin:0}.facts{margin:32px 0}.facts>div{padding:18px 0;border-top:1px solid var(--line)}.facts dt{font-size:13px;color:var(--muted)}.facts dd{margin:5px 0 0;font-size:14px;overflow-wrap:anywhere}.account-controls{border-left:1px solid var(--line);padding-left:30px}.account-controls p{font-size:14px;color:var(--muted)}.account-controls form{margin:0}.document{max-width:840px;margin:64px auto;padding:0 28px}.document h1{font-size:46px}.document h2{margin-top:38px}.document p{color:#465b4e}.document pre{background:#e8ede4;padding:24px;border-radius:10px;overflow:auto;font-size:13px;line-height:1.8;color:#25422d}code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.document table{width:100%;border-collapse:collapse;font-size:14px;margin:28px 0}.document th{text-align:left;color:var(--muted);font-weight:500}.document td,.document th{padding:14px 12px;border-bottom:1px solid var(--line);vertical-align:top}.document td:first-child{width:30%;overflow-wrap:anywhere}.notice{padding:20px;background:var(--wash);border-radius:10px}.sr-only,.skip{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.skip:focus{width:auto;height:auto;clip-path:none;top:8px;left:16px;background:var(--white);padding:8px;z-index:5}
@media(max-width:850px){.home{gap:40px;padding-top:48px;grid-template-columns:1fr 1fr}.intro{padding-top:10px}.home h1{font-size:43px}.paper{padding:24px}.workspace{grid-template-columns:1fr;gap:40px}.setup,.account-controls{padding:28px 0 0;border-left:0;border-top:1px solid var(--line)}.setup{max-width:520px}.principles{flex-wrap:wrap;justify-content:flex-start}.page-head{align-items:flex-start}.account-controls{max-width:420px}}
@media(max-width:600px){.header{padding:18px 22px}.brand{font-size:22px}.brand-zh{display:none}nav{gap:18px}.home{grid-template-columns:1fr;padding:28px 22px 0;gap:36px}.home h1{font-size:44px}.intro{padding-top:12px}.lead{font-size:18px}.home-actions{gap:18px;margin-top:28px}.paper{padding:24px}.principles{gap:12px;padding-top:24px;flex-direction:column}.footer{padding:24px 22px;align-items:flex-start;flex-direction:column;gap:12px;margin-top:40px}.footer div{gap:22px}.narrow{margin:38px auto 50px;padding:0 24px}.narrow h1{font-size:37px}.account strong{font-size:18px}.admin{padding:30px 22px 20px}.page-head h1{font-size:33px}.page-head{margin-bottom:30px;flex-wrap:wrap}.page-head>form{align-items:flex-start}.customer-list li>a{gap:10px}.customer-list li>a>svg{display:none}.customer-list div>span{font-size:12px}.customer-list .status{font-size:11px}.document{margin:40px auto;padding:0 22px}.document h1{font-size:36px}.document pre{padding:16px;font-size:12px}.document td,.document th{padding:12px 6px}.actions{gap:10px}.actions .button{font-size:14px}.detail .page-head{gap:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.narrow form>.button{width:100%}
/* Public product introduction and the code-drawn sending diagram. */
.landing{max-width:1200px;margin:auto;padding:68px 40px 0}.public-hero{max-width:870px;margin-bottom:48px}.public-hero h1{font-size:clamp(40px,5.4vw,68px);font-weight:520;line-height:1.12;margin-bottom:24px}.public-hero .lead{max-width:650px}.public-hero .fine{margin-top:20px}.mail-flow{margin:0;background:var(--white);border:1px solid var(--line);border-radius:14px;padding:30px 36px 20px}.flow-title{font-size:16px;font-weight:550;margin-bottom:32px}.flow-track{display:grid;grid-template-columns:1.2fr .5fr 1fr .5fr 1fr;align-items:center;gap:14px}.flow-sources{display:flex;flex-direction:column;gap:16px}.source-node{display:grid;grid-template-columns:40px 1fr;gap:0 14px;align-items:center;padding:12px 0}.source-node svg{width:40px;height:32px;grid-row:1/3}.source-node strong,.flow-node strong{font-weight:600;font-size:17px}.source-node span,.flow-node span{font-size:13px;color:var(--muted)}.flow-node{display:flex;align-items:center;flex-direction:column;text-align:center;gap:5px;padding:25px 10px}.flow-node svg{width:44px;height:38px;margin-bottom:12px}.flow-mailgo{background:var(--green);color:#fff;border-radius:12px;padding:30px 10px}.flow-mailgo span{color:#dcebdd}.flow-gmail{border:1px solid var(--line);border-radius:12px}.flow-link{display:flex;flex-direction:column;align-items:center;gap:7px;color:var(--muted)}.flow-link svg{width:100%;height:24px}.flow-link span{font-size:11px;white-space:nowrap}.flow-recipient{display:flex;align-items:center;justify-content:flex-end;gap:15px;margin:30px 0 12px;padding-top:24px;border-top:1px solid var(--line)}.flow-recipient svg{width:28px;height:28px}.flow-recipient strong{display:block;font-size:15px;font-weight:550}.flow-recipient span{font-size:13px;color:var(--muted)}.delivery-line{height:1px;background:var(--line);flex:1;max-width:250px;margin-right:18px}.mail-flow figcaption{font-size:12px;color:var(--muted);margin-top:20px}.public-steps{display:grid;grid-template-columns:1fr 1.3fr;gap:85px;padding:76px 0 40px}.public-steps h2{font-size:33px;line-height:1.3;font-weight:520}.public-steps>div p{color:var(--muted);max-width:35ch}.public-steps ol{margin:0;padding-left:26px}.public-steps li{padding:0 0 22px 14px}.public-steps li::marker{color:var(--green);font-size:15px}.public-steps strong{font-size:18px;font-weight:550}.public-steps li p{font-size:15px;color:var(--muted);margin:7px 0 0}.invitation-note{margin:48px 0 20px;max-width:720px}.invitation-note h2{font-size:20px}.invitation-note p{font-size:15px;color:var(--muted)}.connection-state{display:flex;gap:10px;align-items:center;margin-bottom:32px;color:var(--green)}.connection-state strong{font-size:15px}.delegation{margin-top:32px;font-size:14px;overflow-wrap:anywhere}.owner-account .account-controls .button{font-size:14px}.owner-account .facts{margin-top:28px}
@media(max-width:850px){.landing{padding-top:44px}.public-steps{gap:35px}.mail-flow{padding:24px}.flow-track{gap:6px}.source-node{grid-template-columns:1fr}.source-node svg{grid-row:auto;margin-bottom:10px}.flow-node strong{font-size:16px}.flow-node span{font-size:12px}.source-node span{font-size:12px}.flow-link span{font-size:10px}}
@media(max-width:600px){.landing{padding:34px 22px 0}.public-hero{margin-bottom:34px}.public-hero h1{font-size:41px;line-height:1.15}.public-hero .fine{font-size:12px}.mail-flow{padding:24px 20px 20px}.flow-title{font-size:15px;max-width:26ch;margin-bottom:20px}.flow-track{grid-template-columns:1fr;gap:10px}.flow-sources{flex-direction:row;gap:20px;justify-content:center}.source-node{flex:1;padding:0;text-align:center;justify-items:center;gap:3px}.source-node strong{font-size:16px}.flow-node{padding:14px;display:grid;grid-template-columns:40px 1fr;text-align:left;gap:0 14px;width:100%}.flow-node svg{width:36px;height:32px;grid-row:1/3;margin:0}.flow-node strong{font-size:17px}.flow-node span{font-size:13px}.flow-link{position:relative;height:28px;flex-direction:row;justify-content:center;gap:0}.flow-link svg{width:24px;height:24px;transform:rotate(90deg)}.flow-link span{position:absolute;left:calc(50% + 22px);font-size:11px}.flow-recipient{margin:20px 0 0;padding-top:20px;justify-content:flex-start;gap:12px}.flow-recipient strong{font-size:14px}.flow-recipient span{display:block;font-size:12px}.delivery-line{display:none}.mail-flow figcaption{font-size:11px}.public-steps{grid-template-columns:1fr;gap:20px;padding:48px 0 18px}.public-steps h2{font-size:29px}.public-steps>div p{max-width:unset}.public-steps li{padding-left:10px}.invitation-note{margin-top:34px}.header nav{gap:15px;font-size:13px}.header .brand{font-size:21px}.header .brand svg{width:28px}.header{gap:14px}.footer div{flex-wrap:wrap;gap:12px 20px}}

@media(max-width:600px){html[lang='zh-CN'] .public-hero h1{font-size:clamp(29px,8.8vw,35px)}}