:root{--ink:#171816;--muted:#656862;--line:#e2e3df;--soft:#f6f7f4;--accent:#2f6fed;--green:#1f8b57;--max:850px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:82px}body{margin:0;color:var(--ink);background:#fff;font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}a{color:inherit;text-decoration:none}.topbar{height:70px;padding:0 28px;display:flex;align-items:center;gap:34px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}.wordmark{display:flex;align-items:center;gap:10px;margin-right:auto}.wordmark-icon{width:34px;height:34px;display:grid;place-items:center;border-radius:4px;background:var(--ink);color:#fff;font-weight:800}.wordmark strong,.wordmark small{display:block}.wordmark strong{font-size:14px}.wordmark small{font-size:10px;color:var(--muted)}.topbar nav{display:flex;gap:24px;font-size:12px;color:#555952}.topbar nav a:hover{color:var(--accent)}.top-action{padding:9px 13px;background:var(--accent);color:#fff;border-radius:4px;font-size:12px;font-weight:700}.reader{display:block}.document-page{min-width:0}.document-page article{width:min(var(--max),calc(100% - 64px));margin:0 auto;padding:80px 0 120px}.document-cover{padding:0 0 68px;border-bottom:1px solid var(--line)}.document-kicker{margin:0 0 14px;color:var(--accent);font-size:11px;font-weight:800;letter-spacing:.12em}.document-cover h1{font-size:clamp(48px,7vw,82px);line-height:1.02;margin:0;letter-spacing:0}.document-cover h1 span{color:var(--accent)}.lead{max-width:720px;margin:28px 0 0;color:#565a54;font-size:17px;line-height:1.9}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:46px;border:1px solid var(--line);border-radius:6px}.stats div{padding:20px 24px;border-right:1px solid var(--line)}.stats div:last-child{border-right:0}.stats strong,.stats span{display:block}.stats strong{font-size:24px}.stats span{font-size:11px;color:var(--muted);margin-top:4px}.doc-section{padding:58px 0;border-bottom:1px solid var(--line)}.doc-section h2,.contact h2{font-size:32px;line-height:1.3;margin:0 0 24px}.doc-section h3{font-size:20px;margin:34px 0 12px}.doc-section p,.doc-section li{font-size:15px;color:#454943}.doc-section ul{padding-left:22px}.doc-section li{margin:9px 0}.update-list{border-top:1px solid var(--ink)}.update-list p{display:grid;grid-template-columns:56px 1fr;gap:18px;margin:0;padding:16px 0;border-bottom:1px solid var(--line)}.update-list b{color:var(--accent)}.steps{list-style:none;padding:0;margin:0;border-top:1px solid var(--ink)}.steps li{display:grid;grid-template-columns:58px 1fr;gap:24px;padding:22px 0;border-bottom:1px solid var(--line)}.steps b{color:var(--accent);font-size:12px}.steps h3{margin:0 0 6px}.steps p{margin:0}.category{display:grid;grid-template-columns:64px 1fr;gap:24px;padding:34px 0;border-top:1px solid var(--line)}.category>span{color:var(--accent);font-size:12px;font-weight:800}.category h3{margin:0 0 10px;font-size:23px}.category p{margin-top:0}.actual-documents{padding-top:70px}.document-switcher{display:flex;gap:8px;flex-wrap:wrap;margin:28px 0}.document-switcher button{border:1px solid #cfd2cd;background:#fff;border-radius:4px;padding:10px 13px;color:#4f534d;font-size:12px;cursor:pointer}.document-switcher button.active{background:var(--ink);border-color:var(--ink);color:#fff}.source-document{display:none;border:0;border-radius:0;background:#f0f1ef;padding:0 0 20px}.source-document.active{display:block}.document-toolbar{display:flex;gap:18px;align-items:center;padding:12px 18px;background:#f8f9f7;border:1px solid #daddd8;border-bottom:0;color:#777b75;font-size:11px}.toolbar-spacer{flex:1}.source-document-head{padding:42px 74px 34px;background:#fff;border:1px solid #d7d9d5;border-bottom:0}.source-document-head span{color:var(--accent);font-size:11px;font-weight:800}.source-document-head h3{font-size:28px;line-height:1.45;margin:10px 0 4px;font-family:"Noto Serif SC","Songti SC",SimSun,serif}.source-document-head small{color:#9a9d97;font-size:11px}.source-document-body{padding:52px 74px 88px;background:#fff;border:1px solid #d7d9d5;min-height:760px;overflow:visible;box-shadow:0 5px 18px rgba(28,32,26,.06)}.source-document-body h1{font-family:"Noto Serif SC","Songti SC",SimSun,serif;text-align:center;font-size:30px;line-height:1.5;margin:0 0 40px}.source-document-body h2{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:22px;margin:38px 0 18px;padding:0;border:0;line-height:1.5}.source-document-body h3{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:18px;margin:28px 0 12px}.source-document-body p{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:16px;line-height:2.05;text-align:justify;text-indent:2em;color:#30332f;margin:14px 0}.source-document-body ul,.source-document-body ol{padding-left:2.5em;margin:12px 0}.source-document-body li{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:16px;line-height:2;margin:4px 0}.source-document-body blockquote{margin:18px 0;padding:12px 18px;border-left:3px solid var(--accent);background:#f4f6fb;color:#555}.source-document-body strong{color:#171816}.loading{color:var(--muted)!important;font-family:inherit!important;text-indent:0!important}.contact{padding:68px 0 0}.contact>p{color:var(--muted)}.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);border:1px solid var(--line);border-radius:6px;margin:28px 0}.contact-grid div{padding:18px 22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.contact-grid div:nth-child(2n){border-right:0}.contact-grid div:nth-last-child(-n+2){border-bottom:0}.contact-grid span,.contact-grid strong{display:block}.contact-grid span{font-size:11px;color:var(--muted)}.contact-grid strong{font-size:14px;margin-top:5px;overflow-wrap:anywhere}.contact>a{display:inline-flex;gap:24px;padding:13px 16px;background:var(--accent);color:#fff;border-radius:4px;font-size:13px;font-weight:700}
@media(max-width:900px){.topbar nav{display:none}.reader{display:block}.outline{display:none}.document-page article{width:min(100% - 40px,var(--max));padding-top:54px}.document-cover h1{font-size:50px}.source-document-body{padding:26px 24px}}
@media(max-width:560px){.topbar{height:62px;padding:0 16px}.wordmark small{display:none}.top-action{padding:8px 10px}.document-page article{width:calc(100% - 32px);padding:42px 0 80px}.document-cover{padding-bottom:48px}.document-cover h1{font-size:40px}.lead{font-size:15px}.stats{grid-template-columns:1fr}.stats div{border-right:0;border-bottom:1px solid var(--line)}.stats div:last-child{border-bottom:0}.doc-section{padding:46px 0}.doc-section h2,.contact h2{font-size:27px}.steps li,.category{grid-template-columns:42px 1fr;gap:12px}.source-document-head{padding:22px 20px}.source-document-head h3{font-size:20px}.source-document-body{padding:22px 18px;max-height:none}.source-document-body h2{font-size:20px}.contact-grid{grid-template-columns:1fr}.contact-grid div{border-right:0;border-bottom:1px solid var(--line)!important}.contact-grid div:last-child{border-bottom:0!important}}
.wordmark-logo{width:34px;height:34px;display:block;flex:0 0 34px;border-radius:4px;object-fit:cover}.contact-qr-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:26px 0}.contact-qr-card{min-width:0;padding:16px;border:1px solid var(--line);border-radius:6px;background:#fafbf9;display:flex;align-items:center;gap:14px}.contact-qr-card img{width:104px;height:104px;flex:0 0 104px;object-fit:contain;background:#fff;border:1px solid #dfe2dd;padding:6px}.contact-qr-card strong,.contact-qr-card span{display:block}.contact-qr-card strong{font-size:14px}.contact-qr-card span{margin-top:5px;color:var(--muted);font-size:12px;line-height:1.6}.contact-qr-card div{min-width:0}@media(max-width:900px){.contact-qr-grid{grid-template-columns:1fr 1fr}}@media(max-width:560px){.contact-qr-grid{grid-template-columns:1fr}.contact-qr-card img{width:88px;height:88px;flex-basis:88px}}

/* Structured document content: tables, diagrams, formulas and image references. */
.document-table-wrap{width:100%;overflow-x:auto;margin:24px 0}.document-table{width:100%;border-collapse:collapse;table-layout:auto;font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:14px;line-height:1.7}.document-table th,.document-table td{padding:10px 12px;border-top:1px solid #30332f;border-bottom:1px solid #cfd2cd;text-align:left;vertical-align:top;min-width:100px}.document-table th{border-bottom:2px solid #30332f;font-weight:700;background:#fafbf9}.document-table tr:last-child td{border-bottom:1px solid #30332f}.document-figure{margin:28px auto;text-align:center}.document-figure img{display:block;max-width:100%;height:auto;margin:0 auto}.document-figure figcaption{margin-top:8px;color:#656862;font-size:13px;text-align:center}.document-code-figure{padding:18px 20px;background:#f6f7f4;border:1px solid #e2e3df;text-align:left;overflow:auto}.document-code-figure pre{margin:0;white-space:pre-wrap;word-break:break-word;font:14px/1.7 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;color:#30332f}.document-code-figure figcaption{margin-top:10px;text-align:left;text-transform:uppercase;letter-spacing:.08em}.document-math{margin:24px 0;padding:16px 18px;background:#fbfcfa;border-left:3px solid var(--accent);overflow:auto}.document-math pre{margin:0;white-space:pre-wrap;font:16px/1.8 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;color:#30332f}.document-inline-image{display:inline-block;max-width:100%;height:auto;vertical-align:middle}
.source-document-body>table,.source-document-body table{width:100%;margin:24px 0;border-collapse:collapse;table-layout:auto;font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-size:14px;line-height:1.7;overflow-wrap:anywhere}.source-document-body table th,.source-document-body table td{padding:10px 12px;border-top:1px solid #30332f;border-bottom:1px solid #cfd2cd;text-align:left;vertical-align:top;min-width:100px}.source-document-body table th{border-bottom:2px solid #30332f;font-weight:700;background:#fafbf9}.source-document-body table p{margin:0;text-indent:0;text-align:left;font-size:14px;line-height:1.7}.source-document-body p img,.source-document-body img{display:block;max-width:100%;height:auto;margin:24px auto}.source-document-body mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden}
/* Keep contact cards independent from the enclosing document article layout. */
#contact-qr-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));align-items:stretch;gap:20px}
#contact-qr-grid>.contact-qr-card{width:100%;height:auto;min-width:0;margin:0;padding:24px;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:16px;text-align:center}
#contact-qr-grid>.contact-qr-card>img{display:block;box-sizing:border-box;width:180px;height:180px;max-width:100%;aspect-ratio:1;flex:0 0 auto;object-fit:contain;padding:8px;border:1px solid #dfe2dd;border-radius:4px;background:#fff}
#contact-qr-grid>.contact-qr-card>div{width:100%;min-width:0;padding:0}
#contact-qr-grid>.contact-qr-card strong{font-size:15px;line-height:1.6;overflow-wrap:anywhere}
#contact-qr-grid>.contact-qr-card span{font-size:13px;line-height:1.6;overflow-wrap:anywhere}
@media(max-width:560px){#contact-qr-grid{grid-template-columns:minmax(0,1fr);gap:14px}#contact-qr-grid>.contact-qr-card{padding:20px}}