:root{--paper:#f5f4ee;--white:#fbfaf6;--ink:#263541;--muted:#5e6d70;--line:#c9d0c9;--sage:#dce5dc;--deep:#234b4b;--red:#a96051;--max:1200px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.8 'Microsoft YaHei','PingFang SC',sans-serif}img{max-width:100%;height:auto;display:block;object-fit:cover}a{color:var(--deep);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.3}h1,h2{font-family:'Songti SC','SimSun',serif;letter-spacing:.01em}h1{font-size:clamp(2.5rem,5vw,5rem);font-weight:600}h2{font-size:clamp(1.7rem,2.8vw,2.7rem);font-weight:600}h3{font-size:1.18rem}p{color:#455457}.wrap{width:min(calc(100% - 48px),var(--max));margin-inline:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:99}.site-header{background:var(--white);border-bottom:1px solid var(--line)}.header-inner{min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);min-width:0}.brand img{width:44px;height:44px;object-fit:contain}.brand strong{font-size:1.05rem;line-height:1.3;white-space:nowrap}.brand small{display:block;color:var(--muted);font-size:.67rem;letter-spacing:.16em}.nav{display:flex;align-items:center;gap:clamp(13px,2vw,28px);font-size:.87rem}.nav a{color:var(--ink);white-space:nowrap}.nav a[aria-current]{color:var(--deep);font-weight:700;border-bottom:2px solid var(--deep)}.menu-button{display:none;background:none;border:1px solid var(--line);border-radius:4px;padding:4px 11px;color:var(--ink)}.eyebrow,.serial,.overline{font-size:.75rem;letter-spacing:.18em;font-weight:700;color:var(--deep);text-transform:uppercase}.section{padding:72px 0;border-bottom:1px solid var(--line)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:32px}.section-head p{max-width:580px;margin-bottom:0}.section-head h2{margin-bottom:0}.rule{border-top:2px solid var(--ink)}.hero{padding:64px 0 54px;border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(260px,3fr);gap:5%;align-items:stretch}.hero-copy{padding:34px 0}.hero h1{max-width:850px;margin:20px 0 25px}.hero p{max-width:730px;font-size:1.06rem}.hero-visual{position:relative}.hero-visual img{width:100%;height:100%;max-height:560px;min-height:430px;border-radius:3px}.hero-visual:after{content:'ARCHIVE / 001';position:absolute;bottom:16px;right:17px;background:var(--white);font-size:.65rem;letter-spacing:.2em;padding:5px 9px}.actions{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0}.button{display:inline-flex;align-items:center;justify-content:center;min-height:45px;padding:9px 18px;background:var(--deep);color:#fff;font-size:.85rem;font-weight:600;border:1px solid var(--deep)}.button:hover{color:#fff;background:var(--ink);text-decoration:none}.button.secondary{background:transparent;color:var(--deep)}.button.secondary:hover{background:var(--sage)}.quick-links{display:flex;flex-wrap:wrap;gap:6px 18px;padding-top:18px;border-top:1px solid var(--line);font-size:.82rem}.quick-links a:after{content:' ↗'}.index-strip{background:#e5ebe4;border-bottom:1px solid var(--line)}.index-items{display:grid;grid-template-columns:repeat(4,1fr)}.index-items a{display:flex;gap:12px;align-items:center;padding:17px 12px;border-left:1px solid #b8c6bd;font-size:.86rem}.index-items a:last-child{border-right:1px solid #b8c6bd}.index-items b{font-family:Georgia,serif;font-size:1.25rem;font-weight:400;color:var(--deep)}.notices{display:grid;grid-template-columns:1.2fr 1fr .9fr;gap:20px;align-items:start}.notice{background:var(--white);padding:30px;border-top:4px solid var(--deep);min-height:265px}.notice:nth-child(2){margin-top:27px;min-height:232px;border-color:#829d89}.notice:nth-child(3){margin-top:57px;min-height:198px;border-color:var(--red)}.notice h3{font-family:'Songti SC','SimSun',serif;font-size:1.4rem}.notice p:last-child{margin-bottom:0}.feature-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:5%;align-items:center}.feature-grid img{width:100%;height:auto;aspect-ratio:16/9}.feature-grid ul{padding-left:20px;color:#455457}.device-ledger{border-top:2px solid var(--ink)}.device-row{display:grid;grid-template-columns:165px 1fr 1fr;gap:28px;padding:24px 0;border-bottom:1px solid var(--line);align-items:start}.device-row:nth-child(even){grid-template-columns:165px 1.3fr .7fr}.device-row .serial{padding-top:5px}.device-row h3{font-size:1.3rem;margin-bottom:7px}.device-row p{margin:0}.device-row a{justify-self:end;align-self:center;font-size:.84rem;font-weight:700}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}.step{border-top:2px solid var(--ink);padding-top:16px}.step b{font:400 2.8rem/1 Georgia,serif;color:#91a79a}.step h3{margin:18px 0 8px}.step p{font-size:.9rem}.news-index{border-top:2px solid var(--ink)}.news-item{display:grid;grid-template-columns:90px 1fr 190px;gap:25px;align-items:center;border-bottom:1px solid var(--line);padding:22px 0}.news-item.featured{grid-template-columns:90px 1fr 250px}.news-num{font:400 2.3rem Georgia,serif;color:#839a8c}.news-item h3{font:600 1.25rem/1.4 'Songti SC','SimSun',serif;margin:0 0 8px}.news-item p{font-size:.86rem;margin:0;max-width:680px}.news-item img{width:100%;height:auto;aspect-ratio:3/2}.docs{border-top:2px solid var(--ink)}.doc-row{display:grid;grid-template-columns:110px 1fr;gap:24px;padding:23px 0;border-bottom:1px solid var(--line)}.doc-row h3{margin-bottom:8px}.doc-row p{margin-bottom:0}.entry-list{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.entry-list a{background:var(--white);padding:22px;font-weight:700}.entry-list small{display:block;font-weight:400;color:var(--muted)}.cta-band{background:var(--deep);color:#fff;padding:38px 0}.cta-band .wrap{display:flex;justify-content:space-between;align-items:center;gap:25px}.cta-band p,.cta-band h2{color:#fff;margin:0}.cta-band h2{font-size:1.6rem}.cta-band .button{background:#fff;color:var(--deep);border-color:#fff}.site-footer{background:#e7ece6;padding:42px 0 32px;font-size:.78rem}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:30px}.footer-links{display:flex;flex-wrap:wrap;gap:6px 18px}.footer-bottom{padding-top:25px;margin-top:28px;border-top:1px solid #bdc9c0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}.footer-bottom p{margin:0}.page-intro{padding:55px 0 40px;border-bottom:1px solid var(--line)}.page-intro h1{font-size:clamp(2.2rem,4vw,3.8rem);max-width:980px;margin:12px 0 18px}.page-intro p{max-width:820px}.breadcrumb{font-size:.78rem;color:var(--muted);margin-bottom:18px}.breadcrumb a{color:var(--muted)}.lead{font-size:1.1rem}.file-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);margin:36px 0;border:1px solid var(--line)}.file-tabs a{padding:18px;background:var(--white);font-size:.86rem;letter-spacing:.08em;font-weight:700}.file-tabs a:hover{background:var(--sage);text-decoration:none}.file-section{padding:50px 0;border-bottom:1px solid var(--line);scroll-margin-top:24px}.file-section h2{margin:0 0 20px}.file-section .file-kicker{color:var(--deep);font-weight:700;letter-spacing:.15em;font-size:.72rem}.file-columns{display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:start}.file-columns.reverse{grid-template-columns:1.1fr .9fr}.file-columns img,.file-section>img{width:100%;height:auto;aspect-ratio:4/3}.file-section.ios>img{max-width:600px;aspect-ratio:4/3;margin:0 auto 24px}.file-section ul,.prose ul,.prose ol{padding-left:22px;color:#455457}.file-section li,.prose li{margin:5px 0}.file-section h3{margin:20px 0 8px}.resource-links{display:grid;grid-template-columns:repeat(2,1fr);gap:7px 28px;border-top:2px solid var(--ink);padding-top:20px}.resource-links a{border-bottom:1px solid var(--line);padding:5px 0}.prose{max-width:800px}.prose h2{margin:42px 0 14px;font-size:1.8rem}.prose h3{margin:28px 0 10px}.prose p{margin:0 0 18px}.prose img{width:100%;height:auto;margin:28px 0}.feature-grid img,.news-item img,.file-section img,.prose img{border:1px solid var(--line);background:var(--white)}.article-layout{display:grid;grid-template-columns:minmax(0,800px) 240px;gap:7%;padding:45px 0 70px}.article-side{border-top:2px solid var(--ink);padding-top:16px;font-size:.83rem}.article-side a{display:block;padding:11px 0;border-bottom:1px solid var(--line)}.article-nav{display:flex;justify-content:space-between;gap:20px;border-top:2px solid var(--ink);padding-top:18px;margin-top:38px}.archive-table{border-top:2px solid var(--ink)}.archive-line{display:grid;grid-template-columns:70px 1fr 105px;gap:20px;padding:20px 0;border-bottom:1px solid var(--line)}.archive-line h2{font:600 1.23rem 'Songti SC','SimSun',serif;margin:0 0 6px}.archive-line p{font-size:.87rem;margin:0}.faq-group{margin-bottom:50px}.faq-group h2{font-size:1.65rem}.meta-note{font-size:.78rem;color:var(--muted)}@media(max-width:900px){.header-inner{flex-wrap:wrap;padding:13px 0}.menu-button{display:block}.nav{display:none;width:100%;flex-direction:column;align-items:stretch;gap:0;padding-bottom:10px}.nav.open{display:flex}.nav a{padding:9px 0;border-top:1px solid var(--line)}.hero-grid{grid-template-columns:1fr 290px;gap:25px}.hero h1{font-size:2.8rem}.notices{gap:12px}.notice{padding:20px}.device-row{grid-template-columns:115px 1fr auto}.news-item,.news-item.featured{grid-template-columns:60px 1fr 150px}.steps{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:1fr}.article-side{display:none}}@media(max-width:680px){.wrap{width:min(calc(100% - 32px),var(--max))}.section{padding:48px 0}.section-head{display:block}.section-head h2{margin-bottom:10px}.hero{padding:26px 0 36px}.hero-grid{display:block}.hero-copy{padding:0}.hero h1{font-size:clamp(2.25rem,9vw,3.2rem);margin:15px 0}.hero p{font-size:.95rem}.hero-visual img{height:260px;min-height:0;max-height:none;object-position:center 40%}.index-items{grid-template-columns:repeat(2,1fr)}.index-items a{padding:11px;font-size:.75rem}.index-items a:nth-child(3){border-top:1px solid #b8c6bd}.index-items a:nth-child(4){border-top:1px solid #b8c6bd}.notices{display:block}.notice,.notice:nth-child(2),.notice:nth-child(3){min-height:0;margin:0 0 12px}.feature-grid,.file-columns,.file-columns.reverse,.footer-grid{grid-template-columns:1fr}.device-row,.device-row:nth-child(even){grid-template-columns:1fr;gap:5px}.device-row a{justify-self:start}.news-item,.news-item.featured{grid-template-columns:54px 1fr;gap:10px}.news-num{grid-row:1 / span 3;font-size:1.7rem}.news-item>div{display:contents}.news-item h3{grid-column:2;grid-row:1}.news-item>a{grid-column:2;grid-row:2}.news-item img{width:100%;max-height:185px}.news-item p{grid-column:2;grid-row:3}.doc-row{grid-template-columns:65px 1fr;gap:10px}.entry-list,.file-tabs{grid-template-columns:repeat(2,1fr)}.cta-band .wrap{display:block}.cta-band .button{margin-top:20px}.resource-links{grid-template-columns:1fr}.article-nav{flex-direction:column}.archive-line{grid-template-columns:40px 1fr}.archive-line>span:last-child{grid-column:2}}