:root{--ink:#16243d;--muted:#607089;--blue:#2f6fec;--red:#f56b45;--yellow:#f7d56c;--wash:#f2f4f7;--line:#dbe1ea}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--wash);color:var(--ink);font:16px/1.7 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}
a{color:inherit}p{margin:0 0 14px}.workbench-head{height:74px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(18px,calc((100vw - 1240px)/2));gap:28px;position:sticky;top:0;z-index:5}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-width:250px}.brand-seal{width:34px;height:34px;display:grid;place-items:center;background:var(--ink);color:#fff;border-radius:7px;font-weight:800}.brand b{display:block;font-size:15px}.brand small{display:block;color:var(--muted);font-size:11px}.desk-nav{display:flex;gap:22px;margin-left:auto}.desk-nav a{text-decoration:none;color:var(--muted);font-size:14px}.desk-nav a.active,.desk-nav a:hover{color:var(--blue)}.menu-toggle{display:none}
.mobile-nav{display:none}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;background:var(--blue);color:#fff;text-decoration:none;border-radius:6px;font-weight:700}.button.outline{background:#fff;color:var(--blue);border:1px solid #9ab8f7}.eyebrow{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);font-weight:800;margin-bottom:12px}.lead{font-size:18px;line-height:1.8;color:var(--muted);max-width:680px}
.workbench-hero{max-width:1240px;margin:34px auto 0;min-height:580px;background:#fff;border:1px solid var(--line);display:grid;grid-template-columns:42% 58%;overflow:hidden;box-shadow:0 18px 50px rgba(22,36,61,.08)}.hero-copy{padding:66px 48px;display:flex;flex-direction:column;justify-content:center}.hero-copy h1{font-size:clamp(36px,4vw,66px);line-height:1.1;margin:0 0 20px}.hero-copy h1 span{color:var(--blue)}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.hero-facts{display:grid;gap:10px;margin:22px 0 0;border-top:1px solid var(--line);padding-top:18px}.hero-facts div{display:flex;gap:18px}.hero-facts dt{width:62px;color:var(--muted);font-size:12px}.hero-facts dd{margin:0;font-weight:700;font-size:13px}.hero-image{background:#eef1f4}.hero-image img{display:block;width:100%;height:100%;object-fit:cover}
.task-strip{max-width:1240px;margin:18px auto 0;display:grid;grid-template-columns:repeat(3,1fr);background:var(--ink);color:#fff}.task-strip>div{padding:28px 30px;border-right:1px solid rgba(255,255,255,.14)}.task-strip>div:last-child{border:0}.task-strip span{color:var(--yellow);font:700 12px ui-monospace,monospace}.task-strip h2{font-size:19px;margin:10px 0 6px}.task-strip p{color:#c4cfdf;font-size:14px}.workbench-section,.closing-note{max-width:1240px;margin:70px auto}.split-section{display:grid;grid-template-columns:1.1fr .9fr;gap:56px}.workbench-section h2,.closing-note h2{font-size:34px;line-height:1.25;margin:0 0 16px}.index-list{border-top:1px solid var(--line);margin-top:28px}.index-list a{display:flex;justify-content:space-between;gap:20px;padding:16px 0;border-bottom:1px solid var(--line);text-decoration:none}.index-list span{color:var(--muted);text-align:right}.evidence-board{background:#fff;border:1px solid var(--line);padding:24px;box-shadow:0 18px 50px rgba(22,36,61,.08);transform:rotate(1deg)}.board-top{display:flex;justify-content:space-between;color:var(--red);font:11px ui-monospace,monospace;border-bottom:1px solid var(--line);padding-bottom:12px}.evidence-board h3{margin:28px 0 18px;font-size:22px}.evidence-board ol{margin:0;padding:0;list-style:none}.evidence-board li{display:flex;gap:20px;padding:13px 0;border-bottom:1px dashed var(--line)}.evidence-board li b{width:72px}.evidence-board li span{color:var(--muted)}.section-heading{display:flex;justify-content:space-between;align-items:end;border-bottom:2px solid var(--ink);padding-bottom:14px;margin-bottom:22px}.section-heading h2{margin:0;font-size:30px}.read-link{color:var(--blue);font-weight:700;text-decoration:none}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.guide-card{background:#fff;border:1px solid var(--line);padding:24px;min-height:260px}.guide-card time{color:var(--red);font:12px ui-monospace,monospace}.guide-card h3{font-size:19px;line-height:1.4;margin:14px 0}.guide-card h3 a{text-decoration:none}.guide-card p{color:var(--muted);font-size:14px}.closing-note{background:var(--yellow);padding:40px 48px}
.inner-main{max-width:1120px;margin:0 auto;padding:72px 0}.page-intro{max-width:800px;margin-bottom:42px}.page-intro h1{font-size:48px;line-height:1.15;margin:0 0 16px}.intro-actions{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.device-table{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:#fff}.device-table>div{padding:24px;border-right:1px solid var(--line);min-height:230px}.device-table>div:last-child{border:0}.device-table b{font-size:20px}.device-table p,.device-notes p,.device-notes li,.network-layers p{color:var(--muted);font-size:14px}.device-table a{color:var(--blue);font-weight:700;text-decoration:none}.content-band{background:#fff;border:1px solid var(--line);padding:34px;margin-top:32px}.content-band h2{margin:0 0 18px;font-size:26px}.checklist,.record-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.checklist p{border-left:4px solid var(--red);padding-left:14px;color:var(--muted)}.checklist b,.record-grid b{display:block;color:var(--ink)}.device-notes{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.device-notes article{background:#fff;border:1px solid var(--line);padding:30px;min-height:270px}.device-index{color:var(--red);font:700 12px ui-monospace,monospace}.device-notes h2{font-size:27px;margin:20px 0 10px}.region-board{background:#fff;border:1px solid var(--line)}.region-head,.region-row{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:20px;padding:18px 22px}.region-head{background:var(--ink);color:#fff;font-size:12px}.region-row{border-bottom:1px solid var(--line)}.region-row span,.region-row small{color:var(--muted)}.network-layers{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.network-layers article{background:#fff;border-top:5px solid var(--blue);padding:24px;min-height:190px}.network-layers article:nth-child(2){border-color:var(--red)}.network-layers article:nth-child(3){border-color:var(--yellow)}.network-layers span{font:700 11px ui-monospace,monospace;color:var(--muted)}.record-grid{grid-template-columns:repeat(4,1fr)}.record-grid p{background:var(--wash);padding:18px}.faq-list{background:#fff;border:1px solid var(--line)}.faq-list details{padding:20px 24px;border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;font-weight:700}.faq-list p{color:var(--muted);max-width:760px;margin:14px 0 0}.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.long-article{max-width:820px;margin:0 auto;background:#fff;border:1px solid var(--line);padding:56px 64px}.long-article header{border-bottom:1px solid var(--line);padding-bottom:28px;margin-bottom:28px}.long-article h1{font-size:42px;line-height:1.25;margin:10px 0 18px}.long-article section{margin:28px 0}.long-article h2{font-size:25px;line-height:1.3}.long-article p{color:#43536b}.article-next{background:#fff8db;border-left:4px solid var(--yellow);padding:22px;margin-top:36px}.simple-page .content-band{max-width:820px}
.workbench-foot{max-width:1240px;margin:0 auto;padding:42px 0 50px;display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:26px;border-top:2px solid var(--ink)}.workbench-foot strong{font-size:18px}.workbench-foot p,.workbench-foot a{color:var(--muted);font-size:13px}.workbench-foot a{display:block;text-decoration:none;margin:5px 0}.workbench-foot b{display:block;margin-bottom:10px}.workbench-foot>small{grid-column:1/-1;border-top:1px solid var(--line);padding-top:18px;color:var(--muted);font-size:12px}
@media(max-width:900px){.workbench-head{padding:0 18px}.desk-nav{display:none}.menu-toggle{display:block;margin-left:auto;background:#fff;color:var(--ink);border:1px solid var(--line);padding:7px 12px;height:auto}.mobile-nav{display:none;background:#fff;border-bottom:1px solid var(--line);padding:12px 18px}.mobile-nav.open{display:grid}.mobile-nav a{padding:8px 0;text-decoration:none;color:var(--muted)}.workbench-hero{margin:16px 12px 0;display:flex;flex-direction:column-reverse;min-height:0}.hero-image{height:320px}.hero-copy{padding:34px 24px}.hero-copy h1{font-size:42px}.task-strip{margin:12px;grid-template-columns:1fr}.task-strip>div{border-right:0;border-bottom:1px solid rgba(255,255,255,.14)}.workbench-section,.closing-note{margin:48px 18px}.split-section,.guide-grid,.device-table,.device-notes,.network-layers,.article-list,.checklist,.record-grid{grid-template-columns:1fr;gap:12px}.index-list a{display:block}.index-list span{display:block;text-align:left;margin-top:5px}.inner-main{padding:44px 18px}.page-intro h1{font-size:39px}.region-head{display:none}.region-row{grid-template-columns:1fr;gap:5px;padding:18px}.long-article{padding:32px 22px}.long-article h1{font-size:32px}.workbench-foot{margin:0 18px;grid-template-columns:1fr 1fr;padding-top:32px}.workbench-foot>small{grid-column:1/-1}}
@media(max-width:480px){.brand{min-width:0}.brand b{font-size:13px}.brand small{font-size:10px}.hero-image{height:230px}.hero-copy h1{font-size:35px}.hero-copy .lead{font-size:16px}.workbench-foot{grid-template-columns:1fr}.workbench-foot>small{grid-column:auto}}
.home-content-band{max-width:1240px;box-sizing:border-box;margin-left:auto;margin-right:auto}.home-content-band h2{max-width:900px}.home-content-band h3,.home-content-band p{max-width:980px}
@media(max-width:900px){.home-content-band{margin-left:18px;margin-right:18px}}