:root{color-scheme:light;--ink:#172c44;--muted:#546779;--blue:#225bd4;--line:#dfe7ed;--pale:#f4f8fb;--green:#14806a}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:#fff;color:var(--ink);font:16px/1.75 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}html[lang="zh-CN"] [data-l="en"],html[lang="en"] [data-l="zh"]{display:none}a{color:var(--blue);text-underline-offset:4px}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible{outline:3px solid #2773e8;outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.25;letter-spacing:-.035em}h1{font-size:clamp(38px,5.6vw,65px);max-width:730px;margin-bottom:25px;font-weight:720}h2{font-size:clamp(29px,3.7vw,42px);margin-bottom:20px}h3{font-size:21px;letter-spacing:-.015em}.wrap{width:min(1160px,calc(100% - 64px));margin:auto}.site-header{border-bottom:1px solid 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72px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:var(--blue);display:flex;align-items:center;gap:9px;margin-bottom:22px}.dot{width:7px;height:7px;border-radius:50%;background:#269c7e;display:inline-block}.lead{font-size:18px;line-height:1.9;color:var(--muted);max-width:610px;margin-bottom:30px}.actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;border-radius:7px;background:var(--blue);color:white;font-weight:600;font-size:14px;padding:13px 21px;text-decoration:none}.button:hover{background:#184bb8}.text-link{font-size:14px;font-weight:600;text-decoration:none}.hero-note{margin:20px 0 0;font-size:12px;color:var(--muted)}.diagram{background:linear-gradient(145deg,#f1f6fc,#edf6f2);border:1px solid 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#aebfce}.flow-row.last{border-color:#b6d8c9}.flow-row.last .flow-icon{color:var(--green);background:#edf8f3}.chip{font-size:10px;color:#5d7182;background:#f3f6f9;border-radius:4px;padding:3px 7px;white-space:nowrap}.diagram-caption{margin:19px 0 0;font-size:11px;color:#607386;text-align:center}.principles{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);padding:22px 0;gap:25px}.principle{display:flex;gap:12px;align-items:center;font-size:13px;font-weight:600}.tick{color:var(--green);font-size:17px}.section{padding:85px 0}.section-heading{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start;margin-bottom:40px}.section-heading p{color:var(--muted);max-width:520px}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:36px}.feature{padding-top:23px;border-top:2px solid #c9d9ee}.feature .num{display:block;font-size:12px;color:var(--blue);font-weight:700;letter-spacing:.1em;margin-bottom:20px}.feature p{font-size:14px;color:var(--muted);margin-bottom:0}.band{background:var(--pale);border-top:1px solid #e8eef3;border-bottom:1px solid #e8eef3}.workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}.step{padding-top:16px;border-top:1px solid #ccd9e6}.step small{display:block;color:var(--blue);font-weight:700;letter-spacing:.08em;margin-bottom:18px}.step h3{font-size:18px}.step p{font-size:13px;color:var(--muted)}.notice{font-size:13px;border-left:3px solid #9cb7e4;padding:10px 18px;margin:26px 0 0;color:var(--muted);background:#fff}.data-section{display:grid;grid-template-columns:.8fr 1.2fr;gap:85px}.data-list{margin:0;padding:0;list-style:none}.data-list li{border-bottom:1px solid var(--line);padding:18px 0;display:grid;grid-template-columns:150px 1fr;gap:20px}.data-list li:first-child{padding-top:0}.data-list strong{font-size:14px}.data-list p{font-size:13px;color:var(--muted);margin:0}.contact{background:#ecf3ff;border:1px solid #d8e5fb;border-radius:12px;padding:36px 40px;display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:74px}.contact h2{font-size:26px;margin-bottom:10px}.contact p{font-size:14px;color:var(--muted);margin:0}.contact a{font-size:16px;font-weight:650;white-space:nowrap}.footer{padding:35px 0 25px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:15px 35px}.brand.small{font-size:14px}.footer p{font-size:11px;color:var(--muted);margin:13px 0 0;max-width:600px}.footer-links{display:flex;gap:22px;align-items:start;padding-top:3px}.footer-links a{font-size:12px;color:var(--muted);text-decoration:none}.copyright{grid-column:1/-1}.legal{max-width:860px;padding:60px 0 75px}.legal h1{font-size:43px;margin-bottom:16px}.legal .intro{font-size:17px;color:var(--muted)}.legal .updated{font-size:12px;color:var(--muted);margin-bottom:30px}.legal 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@media(max-width:1000px){.nav{gap:20px}.nav nav{gap:18px}.hero{gap:30px}.diagram{padding:23px}.chip{display:none}.data-section{gap:45px}.section-heading{gap:40px}.flow-row{padding:15px}.brand{font-size:15px}}
@media(max-width:760px){.wrap{width:calc(100% - 38px)}.nav{min-height:80px;flex-wrap:wrap;gap:14px;padding:16px 0}.nav .brand{max-width:calc(100% - 88px);font-size:14px}.nav nav{order:3;flex-basis:100%;margin:0;gap:25px}.language{margin-left:auto}.hero{grid-template-columns:1fr;gap:35px;padding:48px 0 38px}h1{font-size:40px}.lead{font-size:16px}.diagram{max-width:540px;width:100%;padding:22px}.hero-note{font-size:11px}.principles{grid-template-columns:1fr;gap:10px;padding:20px 0}.principle{font-size:12px}.section{padding:50px 0}.section-heading{grid-template-columns:1fr;gap:0;margin-bottom:23px}.section-heading p{margin-bottom:0}.features{grid-template-columns:1fr;gap:28px}.feature .num{margin-bottom:12px}.workflow{grid-template-columns:1fr 1fr;gap:22px}.data-section{grid-template-columns:1fr;gap:20px}.data-list li{grid-template-columns:95px 1fr;gap:15px}.contact{flex-direction:column;align-items:start;padding:25px;margin-bottom:45px;gap:20px}.contact a{font-size:14px}.footer{grid-template-columns:1fr;gap:20px}.footer-links{flex-wrap:wrap}.copyright{grid-column:1}.legal{padding:42px 0 55px}.legal h1{font-size:34px}.legal h2{font-size:21px}.legal .intro{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}