@font-face{font-family:LetterManrope;src:local("Manrope");font-display:swap}
:root{
  --s1:4px;--s2:8px;--s3:12px;--s4:16px;--s6:24px;--s8:32px;--s10:40px;--s12:48px;--s16:64px;--s24:96px;--s30:120px;
  --h1:clamp(44px,5vw,56px);--h2:clamp(30px,3.4vw,36px);--h3:24px;--body:16px;--small:13px;
  --radius-pill:160px;--radius-card:16px;--radius-soft:12px;--radius-small:8px;
  --paper:#fff;--wash:#f5f5f6;--ink:#101114;--text:#34343a;--muted:#696970;--line:#d8d8dc;--brand:#d92f4b;--brand-deep:#b91f39;--brand-pale:#ffe2e7;--green:#00a86b;--red:#d92f4b;--yellow:#f5b82e;--shadow:0 12px 32px rgba(0,0,0,.08);--container:1200px
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;background:var(--paper);color:var(--text);font:400 var(--body)/1.65 LetterManrope,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif}body,button,input{font-family:inherit}img,svg{display:block;max-width:100%}a{color:inherit;text-decoration:none}button{color:inherit}button,a,summary{touch-action:manipulation}[hidden],.hidden{display:none!important}.container{width:min(calc(100% - 48px),var(--container));margin-inline:auto}.site-header{position:sticky;z-index:30;top:0;height:64px;background:#fff;border-bottom:1px solid #e6e7e9}.header-inner{height:100%;display:flex;align-items:center;gap:var(--s6)}.brand-link{display:flex;align-items:center;gap:10px;flex:0 0 auto;font-weight:760;color:#111}.brand-link img{width:34px;height:34px}.brand-link span{letter-spacing:-.02em}.main-nav{display:flex;align-items:center;gap:var(--s1);margin-right:auto}.main-nav a,.mobile-nav a{padding:8px 10px;border-radius:var(--radius-pill);font-size:14px;white-space:nowrap}.main-nav a:hover,.main-nav a[aria-current]{background:var(--wash);color:#111}.header-actions{display:flex;align-items:center;gap:var(--s2)}.header-login,.header-create,.lang-dropdown summary{height:40px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-pill);font-size:14px;white-space:nowrap}.header-login{padding:0 16px;background:#fff;border:1px solid #b9bdc5}.header-login:hover{background:var(--wash);color:#111}.header-create{padding:0 18px;background:var(--brand);color:#fff;font-weight:700}.header-create:hover{background:var(--brand-deep);color:#fff}.lang-dropdown{position:relative}.lang-dropdown summary{list-style:none;cursor:pointer;padding:0 36px 0 14px;border:1px solid #c7cad0;background:#fff;position:relative}.lang-dropdown summary::-webkit-details-marker{display:none}.lang-dropdown summary::after{content:"";position:absolute;right:15px;top:15px;width:7px;height:7px;border-right:2px solid #333;border-bottom:2px solid #333;transform:rotate(45deg)}.lang-dropdown[open] summary::after{top:18px;transform:rotate(225deg)}.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:176px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-soft);box-shadow:var(--shadow)}.lang-menu a{display:flex;align-items:center;justify-content:space-between;padding:9px 10px;border-radius:8px;font-size:14px}.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--wash)}.lang-menu a[aria-current]::after{content:"";width:9px;height:5px;border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(-45deg)}.nav-toggle{display:none;width:40px;height:40px;border:0;border-radius:50%;background:var(--wash);padding:0;place-items:center;place-content:center}.nav-toggle span,.nav-toggle::before,.nav-toggle::after{content:"";width:18px;height:2px;background:#111;border-radius:2px}.nav-toggle{gap:4px}.mobile-nav{position:fixed;z-index:50;top:72px;left:16px;right:16px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow)}.mobile-nav a{display:block;margin:2px 0}.hero{padding:var(--s24) 0 var(--s16);overflow:hidden}.hero-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:var(--s16)}.eyebrow,.section-kicker,.demo-pill,.real-pill{display:flex;width:max-content;min-width:0;max-width:calc(100vw - 48px);align-items:center;border-radius:var(--radius-pill);font-size:var(--small);font-weight:750}.eyebrow{padding:6px 11px;background:var(--brand-pale);color:#8f1b33}.eyebrow+h1{margin-top:20px}.hero h1{max-width:680px;margin-bottom:var(--s6);font-size:var(--h1);font-weight:400;line-height:1.2;letter-spacing:-2.24px;color:var(--ink);text-wrap:balance}.hero-lead{max-width:600px;margin:0;color:#4d5056;font-size:17px;line-height:1.75}.scene-tags{display:flex;flex-wrap:wrap;gap:var(--s2);margin-top:var(--s6)}.scene-tags span{padding:6px 11px;background:var(--wash);border-radius:var(--radius-pill);font-size:13px;color:#444}.hero-actions{display:flex;flex-wrap:wrap;gap:var(--s3);margin-top:var(--s8)}.button{min-height:48px;padding:0 22px;display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:var(--radius-pill);font-weight:750;font-size:15px;cursor:pointer}.button-primary{background:var(--brand);color:#fff}.button-primary:hover{background:var(--brand-deep);color:#fff}.button-secondary{background:var(--wash);color:#202025;border-color:#c8cad0}.button-secondary:hover{background:#e6e7e9;color:#111}.hero-note{margin:var(--s4) 0 0;color:#70737a;font-size:12px}.hero-visual{min-width:0;padding:22px;background:#1d1d24;border-radius:var(--radius-card);box-shadow:var(--shadow);transform:rotate(1deg)}.visual-top{display:flex;gap:7px;padding-bottom:16px}.visual-top i{width:10px;height:10px;border-radius:50%;background:var(--red)}.visual-top i:nth-child(2){background:var(--yellow)}.visual-top i:nth-child(3){background:var(--green)}.visual-board{display:grid;grid-template-columns:130px 1fr;min-height:330px;overflow:hidden;background:#fff;border-radius:10px}.visual-rail{background:#f0f0f2;padding:20px 14px}.visual-logo-line,.visual-rail span{display:block;height:11px;margin-bottom:17px;border-radius:10px;background:#cfd0d5}.visual-logo-line{width:76%;height:18px;background:var(--brand)}.visual-screen{padding:24px}.visual-screen h2{margin:0 0 22px;font-size:22px;color:#111}.status-board{display:grid;grid-template-columns:1.6fr .8fr .8fr}.status-board div{padding:13px 12px;font-size:12px}.status-board div:nth-child(3n+2){background:#dff8eb;color:#11643f}.status-board div:nth-child(3n){background:#fff0ca;color:#704e00}.visual-bars{display:flex;gap:8px;margin-top:24px}.visual-bars i{height:55px;flex:1;border-radius:7px 7px 2px 2px;background:var(--brand-pale)}.visual-bars i:nth-child(2){height:83px;background:var(--green)}.visual-bars i:nth-child(3){height:65px;background:var(--red)}.visual-bars i:nth-child(4){height:98px;background:var(--brand)}.mailbox-section{padding:var(--s12) 0 var(--s30);scroll-margin-top:70px}.section-heading{text-align:center;max-width:780px;margin:0 auto var(--s10)}.section-kicker{margin:0 auto 14px;padding:5px 10px;background:var(--brand-pale);color:#8f1b33}.section-heading h2,.section-title{margin:0;color:#111;font-size:var(--h2);font-weight:500;line-height:1.25;letter-spacing:-1.2px;text-wrap:balance}.section-heading p{max-width:650px;margin:var(--s4) auto 0;color:var(--muted)}.mailbox-app{height:720px;min-height:600px;display:grid;grid-template-rows:auto 1fr;overflow:hidden;background:#24242c;border-radius:var(--radius-card);box-shadow:var(--shadow);color:#fff}.mailbox-toolbar{display:flex;align-items:center;gap:var(--s3);padding:20px 22px;border-bottom:1px solid #45454e}.address-well{height:52px;min-width:0;flex:1;display:flex;align-items:center;background:#35353e;border:1px solid #555560;border-radius:var(--radius-pill);overflow:hidden}.address-well code{min-width:0;flex:1;padding-left:20px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font:650 15px/1.2 inherit;color:#fff}.copy-address{height:52px;flex:0 0 auto;padding:0 22px;border:0;border-radius:var(--radius-pill);background:var(--brand);color:#fff;font-weight:750;cursor:pointer}.copy-address:hover{background:var(--brand-deep);color:#fff}.timer-box{min-width:116px}.timer-box span{display:block;color:#bebec7;font-size:11px}.timer-box strong{font-size:18px;letter-spacing:.05em}.tool-actions{display:flex;align-items:center;gap:var(--s2)}.tool-button{height:44px;padding:0 15px;border:1px solid #656570;border-radius:var(--radius-pill);background:#35353e;color:#fff;font-weight:650;cursor:pointer}.tool-button:hover{background:#494954;color:#fff}.refresh-button{width:44px;padding:0;display:grid;place-items:center}.refresh-button svg{width:19px;stroke:currentColor;fill:none;stroke-width:2}.refresh-button.is-spinning svg{animation:spin .55s linear}@keyframes spin{to{transform:rotate(360deg)}}.inbox-grid{min-height:0;display:grid;grid-template-columns:minmax(260px,36%) minmax(0,64%);background:#fff;color:var(--text)}.message-pane{min-width:0;background:#f6f6f7;border-right:1px solid #dedfe2;overflow-y:auto}.message-pane-head{position:sticky;z-index:2;top:0;padding:18px 20px;background:#f6f6f7;border-bottom:1px solid #dedfe2}.message-pane-head strong{display:block;color:#111}.list-demo-hint{display:block;margin-top:3px;color:#65686f;font-size:12px;line-height:1.45}.message-row{width:100%;min-width:0;display:grid;grid-template-columns:40px minmax(0,1fr) auto;grid-template-rows:auto 1fr;gap:5px 11px;padding:18px 18px;border:0;border-bottom:1px solid #dedfe2;background:#f6f6f7;text-align:left;cursor:pointer;position:relative}.message-row:hover,.message-row.is-active{background:#fff;color:var(--text)}.message-row.is-active::before{content:"";position:absolute;inset:0 auto 0 0;width:4px;background:var(--brand)}.sender-mark{grid-row:1/3;width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:var(--brand-pale);color:#9c2038}.sender-mark svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8}.sender-mark.large{width:52px;height:52px}.message-copy{min-width:0;display:block}.message-copy strong,.subject-line,.preview-line{display:block;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.message-copy strong{font-size:14px;color:#111}.subject-line{font-size:14px;font-weight:650;color:#333}.preview-line{margin-top:3px;font-size:12px;color:#65686f}.message-row time{font-size:11px;color:#74777e}.unread-dot{position:absolute;right:18px;bottom:18px;width:8px;height:8px;border-radius:50%;background:var(--brand)}.reader{min-width:0;background:#fff;overflow:auto}.reader-inner{padding:24px 26px}.reader-close{display:none;width:44px;height:44px;border:0;border-radius:50%;background:#f0f0f2;color:#222;place-items:center}.reader-close svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2}.mail-head{display:flex;gap:16px;align-items:flex-start;padding-bottom:24px;border-bottom:1px solid #e1e2e4}.mail-head>div{min-width:0}.mail-head h3{margin:9px 0 4px;font-size:22px;line-height:1.35;color:#111}.mail-head p{margin:0;color:#6a6d74;font-size:13px}.demo-pill,.real-pill{padding:4px 9px}.demo-pill{background:#fff2c9;color:#624800}.real-pill{background:#dff8eb;color:#0d6039}.demo-letter{max-width:610px;margin:28px auto 0;padding:30px;border-radius:14px;background:#f7f7fa;color:#27272c}.demo-brand{display:flex;align-items:center;gap:10px;margin-bottom:26px}.demo-brand svg{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.8}.instagram-letter .demo-brand{color:#a33284}.zoom-letter .demo-brand{color:var(--brand)}.demo-code{margin:24px 0;padding:20px;text-align:center;border-radius:10px;background:#fff;font-size:34px;font-weight:800;letter-spacing:.18em;color:#24242a}.demo-small,.demo-disclaimer{font-size:12px;color:#6d7077}.meeting-card{display:grid;gap:7px;margin:22px 0;padding:20px;border-left:4px solid var(--green);border-radius:8px;background:#fff}.fake-mail-button{display:flex;width:max-content;margin-top:20px;padding:11px 18px;border-radius:var(--radius-pill);background:var(--brand);color:#fff;font-weight:750}.demo-disclaimer{max-width:610px;margin:18px auto 0}.mail-frame{width:100%;min-height:430px;margin-top:20px;border:0;background:#fff}.alternating{padding:var(--s30) 0}.alternating.is-gray{background:var(--wash)}.feature-grid,.scenario-grid,.boundary-grid,.step-grid{display:grid;gap:var(--s6);margin-top:var(--s10)}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.scenario-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.boundary-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.step-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.feature-card,.scenario-card,.boundary-card,.step-card{min-width:0;border-radius:var(--radius-card);background:#fff;box-shadow:0 8px 22px rgba(0,0,0,.06)}.feature-card,.boundary-card,.step-card{padding:28px}.scenario-card{padding:24px}.feature-card:hover,.scenario-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.feature-card h3,.scenario-card h3,.boundary-card h3,.step-card h3{margin:0 0 12px;font-size:21px;line-height:1.35;color:#111}.feature-card p,.scenario-card p,.boundary-card p,.step-card p{margin:0;color:#5e6269}.status-strip{height:7px;margin:-28px -28px 24px;border-radius:16px 16px 0 0;background:var(--brand)}.feature-card:nth-child(2) .status-strip{background:var(--green)}.feature-card:nth-child(3) .status-strip{background:var(--red)}.scenario-card{border-top:6px solid var(--brand-pale)}.scenario-card:nth-child(2){border-color:#bdeed7}.scenario-card:nth-child(3){border-color:#ffd7a3}.scenario-card:nth-child(4){border-color:#f7bdc8}.comparison-band{padding:var(--s30) 0;background:#222229;color:#fff}.comparison-band .section-title{color:#fff}.comparison-band .section-heading p{color:#c8c8d0}.boundary-card{background:#303039;color:#fff;box-shadow:none}.boundary-card h3{color:#fff}.boundary-card p,.boundary-card li{color:#d8d8de}.boundary-card ul{margin:18px 0 0;padding-left:20px}.boundary-card li+li{margin-top:9px}.boundary-card.is-coral{background:#b91f39}.section-cta{padding-top:var(--s6)}.section-cta .button-secondary{background:#fff;color:#222;border-color:transparent}.section-cta .button-secondary:hover{background:#ececf3;color:#111}.step-number{display:grid;place-items:center;width:38px;height:38px;margin-bottom:18px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800}.privacy-layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(300px,.9fr);gap:var(--s16);align-items:start}.privacy-copy h2{margin:14px 0 18px;font-size:var(--h2);line-height:1.25;color:#111}.privacy-copy p{color:#565a61}.privacy-list{padding:28px;border-radius:var(--radius-card);background:#fff;box-shadow:var(--shadow)}.privacy-list div{display:grid;grid-template-columns:12px 1fr;gap:12px;align-items:start}.privacy-list div+div{margin-top:18px}.privacy-list i{width:10px;height:10px;margin-top:8px;border-radius:50%;background:var(--green)}.privacy-list p{margin:0}.privacy-list strong{display:block;color:#111}.privacy-list span{display:block;margin-top:3px;color:#62666d;font-size:14px}.faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s4);margin-top:var(--s10);align-items:start}.faq-grid details{padding:20px 22px;border-radius:var(--radius-soft);background:#fff;box-shadow:0 6px 18px rgba(0,0,0,.05)}.faq-grid summary{cursor:pointer;font-weight:750;color:#111}.faq-grid p{margin:14px 0 0;color:#5e6269}.pre-footer{padding:var(--s24) 0}.cta-card{display:grid;grid-template-columns:1fr auto;align-items:center;gap:var(--s8);padding:42px;border-radius:var(--radius-card);background:var(--brand-pale)}.cta-card h2{margin:0;font-size:32px;line-height:1.25;color:#5f1022}.cta-card p{margin:10px 0 0;color:#6e2b3a}.site-footer{padding:64px 0 28px;background:#17171d;color:#fff}.site-footer .brand-link{color:#fff}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:var(--s10)}.footer-brand p{max-width:330px;color:#bdbdc7;font-size:14px}.footer-col h2{margin:0 0 15px;font-size:14px;color:#fff}.footer-col a{display:block;width:max-content;max-width:100%;padding:4px 0;color:#c8c8d1;font-size:14px}.footer-col a:hover{color:#fff}.footer-language{display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;margin-top:44px;padding-top:22px;border-top:1px solid #3c3c45}.footer-language strong{margin-right:6px;font-size:13px}.footer-language a{color:#bdbdc7;font-size:13px}.footer-language a[aria-current]{color:#fff;font-weight:750}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:24px;color:#898993;font-size:12px}.toast.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}.toast{position:fixed;z-index:80;left:50%;bottom:24px;width:max-content;max-width:min(430px,calc(100% - 32px));padding:12px 17px;border-radius:14px;background:#24242c;color:#fff;box-shadow:var(--shadow);opacity:0;transform:translate(-50%,12px);pointer-events:none;transition:.2s}.toast.is-error{background:#8e2637;color:#fff}
@media(max-width:1020px){.main-nav{display:none}.header-actions{margin-left:auto}.nav-toggle{display:grid}.header-login{display:none}.hero-grid{grid-template-columns:1fr;gap:48px}.hero-copy{max-width:720px}.feature-grid{grid-template-columns:1fr 1fr}.scenario-grid{grid-template-columns:1fr 1fr}.mailbox-toolbar{flex-wrap:wrap}.address-well{flex-basis:calc(100% - 140px)}.tool-actions{margin-left:auto}.footer-grid{grid-template-columns:1.5fr 1fr 1fr}.footer-col:last-child{grid-column:2/4}}
@media(max-width:760px){:root{--h1:clamp(40px,12vw,46px);--h2:30px}.container{width:min(calc(100% - 32px),var(--container))}.site-header{height:64px}.brand-link span{font-size:14px}.header-create{display:none}.hero{padding:64px 0 48px}.hero h1{letter-spacing:-1.5px}.hero-visual{padding:14px;transform:none}.visual-board{grid-template-columns:80px 1fr;min-height:280px}.visual-rail{padding:15px 9px}.visual-screen{padding:17px}.visual-screen h2{font-size:18px}.status-board div{padding:9px 7px;font-size:10px}.mailbox-section{padding-bottom:80px}.mailbox-app{height:auto;min-height:0;overflow:visible}.mailbox-toolbar{padding:16px}.address-well{flex-basis:100%;width:100%}.timer-box{order:2}.tool-actions{order:3;min-width:0;flex-wrap:wrap}.inbox-grid{grid-template-columns:minmax(0,1fr)}.inbox-grid>.reader{display:none}.mailbox-app.mobile-reader-open .inbox-grid>.reader{display:block;position:fixed;z-index:60;inset:0;width:100%;height:100dvh;overflow:auto;background:#fff}.mailbox-app.mobile-reader-open .reader-close{position:fixed;z-index:2;top:14px;right:14px;display:grid}.mailbox-app.mobile-reader-open .reader-inner{padding:72px 20px 28px}.mailbox-app.mobile-reader-open .mail-frame{min-height:calc(100dvh - 190px)}.message-pane{max-height:520px;border-right:0}.feature-grid,.scenario-grid,.boundary-grid,.step-grid,.faq-grid,.privacy-layout{grid-template-columns:minmax(0,1fr)}.alternating,.comparison-band{padding:80px 0}.feature-grid,.scenario-grid,.boundary-grid,.step-grid{margin-top:32px}.cta-card{grid-template-columns:1fr;padding:30px}.footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.footer-brand{grid-column:1/3}.footer-col:last-child{grid-column:auto}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:7px}}
@media(max-width:480px){.lang-dropdown summary{font-size:0;width:40px;padding:0;gap:0;overflow:hidden;justify-content:center}.lang-dropdown summary::before{content:"";width:18px;height:18px;border:0;border-radius:0;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cellipse cx='12' cy='12' rx='4' ry='9'/%3E%3Cpath d='M3 12h18'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cellipse cx='12' cy='12' rx='4' ry='9'/%3E%3Cpath d='M3 12h18'/%3E%3C/svg%3E") center/contain no-repeat}.lang-dropdown summary::after{display:none}.hero-actions .button{width:100%}.visual-rail{display:none}.visual-board{grid-template-columns:1fr}.address-well code{padding-left:14px;font-size:13px}.copy-address{padding:0 16px}.tool-actions{width:100%}.tool-button{flex:1;padding:0 10px;font-size:13px}.refresh-button{flex:0 0 44px}.footer-grid{grid-template-columns:1fr}.footer-brand,.footer-col:last-child{grid-column:auto}.footer-language{align-items:flex-start}.cta-card h2{font-size:28px}}

.reader-inner .archive-attachments{display:flex;flex-wrap:wrap;gap:10px;margin:16px 24px 24px;padding:12px 14px;border:1px solid #e6e7e9;border-radius:12px}