:root{color-scheme:light;--ink:#163b32;--muted:#66736c;--line:#dbdfd6;--paper:#f7f8f2;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-size:16px;line-height:1.8;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}main{max-width:1240px;margin:auto;padding:0 48px}a{color:inherit;text-underline-offset:5px;text-decoration-thickness:1px}a:hover{color:#39745f}a:focus-visible,button:focus-visible{outline:3px solid #668b38;outline-offset:5px}button{font:inherit;cursor:pointer}nav{height:100px;display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line);font-size:14px}.brand{margin-right:auto;text-decoration:none;font-size:22px;font-weight:700;letter-spacing:-1px;display:flex;align-items:center;gap:12px}.brand:before{content:"";width:29px;height:29px;display:block;border:2px solid var(--ink);border-radius:7px 7px 7px 0;box-shadow:inset -8px 8px 0 #dcf49b;transform:rotate(-8deg)}nav>a:not(.brand){text-decoration:none;color:var(--muted)}nav>a[aria-current=page]{color:var(--ink)}.language-toggle{display:flex;padding:4px;background:#e9ede3;border-radius:30px;gap:2px}.language-toggle button{border:0;background:none;border-radius:22px;padding:5px 12px;font-size:12px;color:var(--muted)}.language-toggle button[aria-pressed=true]{background:var(--ink);color:#fff}
.hero{position:relative;padding:62px 0 46px;border-bottom:1px solid var(--line);overflow:hidden}.hero .eyebrow{font-size:11px;letter-spacing:.19em;text-transform:uppercase;font-weight:600;display:flex;gap:10px;align-items:center}.hero .eyebrow:before{content:"";height:6px;width:6px;border-radius:50%;background:#648d3d}h1{font-weight:520;font-size:clamp(45px,5.5vw,76px);line-height:1.07;letter-spacing:-.055em;max-width:750px;margin:23px 0 25px;text-wrap:balance}.hero .intro{color:var(--muted);max-width:600px;font-size:18px;line-height:1.6}.hero .meta{font-size:12px;color:var(--muted);margin-top:30px;letter-spacing:.015em}.hero-stamp{position:absolute;right:25px;top:90px;width:150px;height:150px;border:1px solid #c5d3bf;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:radial-gradient(circle,#e5efcd,transparent 72%);transform:rotate(9deg);font-size:10px;letter-spacing:.17em;text-transform:uppercase}.hero-stamp b{font-size:48px;font-weight:350;line-height:1.2;letter-spacing:-3px}
.reading-layout{display:grid;grid-template-columns:220px minmax(0,720px);justify-content:space-between;gap:65px;padding:50px 0 80px}.toc{position:sticky;top:32px;align-self:start}.toc-label{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 20px}.toc a{display:flex;gap:12px;text-decoration:none;line-height:1.5;font-size:13px;margin:0 0 19px;color:var(--muted)}.toc a:hover{color:var(--ink)}.toc a span{font-size:10px;color:#829477;line-height:2}.toc-contact{border-top:1px solid var(--line);padding-top:23px;margin-top:30px;font-size:12px}.toc-contact a{font-size:13px;color:var(--ink);margin-top:6px}.article>p{color:#55665c}.article p{margin:0 0 20px}.article h2{font-weight:550;font-size:25px;letter-spacing:-.035em;line-height:1.3;margin:42px 0 18px;padding-top:16px;scroll-margin-top:32px}.article h2:not(:first-child){border-top:1px solid var(--line);padding-top:32px}.card{position:relative;margin:30px 0 42px;padding:28px 30px;background:#eaf0de;border-left:3px solid #6b8e42;border-radius:0 12px 12px 0}.card strong{font-size:11px;letter-spacing:.12em;text-transform:uppercase}.card p{margin:12px 0 0;color:#355043;line-height:1.8}.article ul{padding-left:21px}.article li{padding-left:5px;margin:14px 0;color:#55665c}.article ol{padding:0;list-style:none;counter-reset:steps}.article ol li{counter-increment:steps;position:relative;padding:22px 20px 22px 70px;border-bottom:1px solid var(--line);margin:0}.article ol li:before{content:"0" counter(steps);position:absolute;left:0;top:20px;color:#6b815d;font-size:14px;border:1px solid #d3dbc8;width:36px;height:36px;display:grid;place-items:center;border-radius:50%}.article strong{color:var(--ink)}footer{padding:25px 0 38px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:11px;letter-spacing:.025em}.footer-wordmark{font-size:30px;letter-spacing:-1.5px;color:var(--ink);margin-bottom:8px;font-weight:650}[hidden]{display:none!important}html{scroll-behavior:smooth}.article a{overflow-wrap:anywhere}main>section[lang]{margin-top:0}main>h1,main>p,main>h2,main>.card{max-width:760px}
@media(max-width:1050px){.hero-stamp{right:0;width:110px;height:110px;top:90px}.hero h1{max-width:75%;font-size:62px}.reading-layout{grid-template-columns:180px minmax(0,1fr);gap:36px}}
@media(max-width:760px){main{padding:0 24px}nav{height:80px;gap:18px}.brand{font-size:20px}.hero{padding:42px 0 32px}.hero h1{font-size:49px;max-width:100%}.hero-stamp{display:none}.hero .intro{font-size:17px}.reading-layout{display:block;padding:28px 0 40px}.toc{position:static;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:30px}.toc-links{display:flex;flex-wrap:wrap;gap:10px 20px}.toc a{font-size:12px;margin:0 0 10px}.toc-contact{display:none}.toc-label{margin-bottom:14px}.card{padding:22px}.article h2{font-size:23px}footer{flex-wrap:wrap}.language-toggle button{padding:4px 9px}nav>a:not(.brand){font-size:12px}}
[lang=zh-Hans] .hero h1{white-space:pre-line;letter-spacing:-.035em;font-size:clamp(36px,5vw,64px);font-weight:550;line-height:1.25}
.brand:before{background:url('/logo-mark.svg') center/contain no-repeat;border:0;box-shadow:none;border-radius:0;transform:none;width:32px;height:36px}
.skip-link{position:fixed;top:8px;left:12px;z-index:10;background:var(--ink);color:white;padding:8px 18px;transform:translateY(-200%)}.skip-link:focus{transform:translateY(0)}
.support-page .hero h1{white-space:pre-line;font-size:clamp(40px,5vw,68px)}
.support-page .article>.card:first-child{margin-top:0}.menu-diagram{margin:24px 0 0}.diagram-screen{background:linear-gradient(135deg,#dee9d1,#f2f4e7);border:1px solid #c2ceb7;border-radius:10px;min-height:125px;overflow:hidden}.diagram-bar{display:flex;justify-content:space-between;padding:8px 16px;background:#fafbf6c9;border-bottom:1px solid #c2ceb7;font-size:11px;font-weight:600}.diagram-bar span:last-child{word-spacing:14px}.diagram-pointer{width:max-content;margin:20px 22px 20px auto;padding:5px 12px;background:var(--ink);color:#eef4e6;border-radius:6px;font-size:12px;transform:rotate(-3deg)}figcaption{font-size:10px;color:var(--muted);margin-top:8px}.faq{border-top:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line)}.faq summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;padding:20px 0;gap:20px;font-weight:550;font-size:16px}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:'+';font-size:23px;font-weight:350;line-height:1;color:#6b815d}.faq details[open] summary:after{content:'−'}.faq p{color:#55665c;font-size:15px;padding:0 36px 6px 0}.faq summary:focus-visible{outline:2px solid #668b38;outline-offset:4px}.article:focus{outline:none}
@media(max-width:420px){nav{gap:12px;flex-wrap:wrap;height:auto;padding:18px 0;row-gap:14px}.brand{flex:1 0 calc(100% - 120px)}.language-toggle{order:1;margin-left:auto}nav>.brand{order:0}nav>a:not(.brand){order:2}.hero h1{font-size:43px}.hero{padding-top:30px}.card{padding:20px}.reading-layout{padding-top:25px}footer .footer-wordmark{font-size:25px}}
@media print{nav,.toc,.hero-stamp,.language-toggle,.skip-link{display:none}.reading-layout{display:block}main{padding:0}body{background:white}.hero{padding:20px 0}.article{max-width:none}}
.brand:before{display:none}.brand{gap:8px}.brand img{width:44px;height:44px;object-fit:contain}.hero{min-height:335px;padding:54px 0 44px;padding-right:46%}.hero h1,.support-page .hero h1{font-size:clamp(40px,4.2vw,61px);max-width:100%;line-height:1.1}.hero .intro{font-size:16px;max-width:490px}.hero-visual{position:absolute;right:0;top:60px;width:40%;margin:0}.hero-visual img{display:block;width:100%;height:auto}.hero-visual figcaption{font-size:9px;letter-spacing:.1em;text-align:center;color:#6b795f;margin-top:12px}[lang=zh-Hans] .hero h1{font-size:clamp(36px,3.8vw,54px);line-height:1.25}.diagram-bar span:last-child{display:flex;gap:12px;align-items:center}.diagram-bar img{display:block;object-fit:contain}.footer-wordmark{font-size:24px}
@media(max-width:900px){.hero{padding-right:42%}.hero-visual{width:38%;top:85px}.hero h1,.support-page .hero h1{font-size:44px}[lang=zh-Hans] .hero h1{font-size:42px}}
@media(max-width:640px){.hero{padding:32px 0}.hero-visual{position:static;width:100%;max-width:420px;margin:26px auto 0}.hero h1,.support-page .hero h1{font-size:46px}.hero .meta{margin-top:20px}[lang=zh-Hans] .hero h1{font-size:40px}.hero-visual img{max-height:210px}.hero-visual figcaption{margin-top:4px}.brand img{width:36px;height:36px}}
@media(min-width:641px){.hero{min-height:390px}}
@media print{.hero-visual{display:none}.hero{padding-right:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}