:root{
  --paper:#f7f0e4;
  --paper-2:#fffaf0;
  --ink:#102936;
  --muted:#66737a;
  --line:#d9c7a8;
  --red:#b95339;
  --terracotta:#d9865d;
  --teal:#517b83;
  --brass:#b89057;
  --shadow:0 20px 60px rgba(41,30,16,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,var(--paper),#fbf7ee 44%,#f2eadc);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;line-height:1.68;letter-spacing:0}
body::before{content:"";position:fixed;inset:0;pointer-events:none;background:radial-gradient(circle at 8% 4%,rgba(190,90,61,.12),transparent 22%),linear-gradient(90deg,rgba(16,41,54,.045) 1px,transparent 1px),linear-gradient(0deg,rgba(16,41,54,.035) 1px,transparent 1px);background-size:auto,44px 44px,44px 44px;mix-blend-mode:multiply;opacity:.7}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px clamp(18px,4vw,48px);background:rgba(247,240,228,.9);backdrop-filter:blur(16px);border-bottom:1px solid rgba(16,41,54,.14)}
.brand-lockup{display:flex;align-items:center;gap:10px;font-weight:850;white-space:nowrap}
.brand-symbol{width:28px;height:28px;border:2px solid var(--ink);background:linear-gradient(135deg,var(--red),var(--brass));box-shadow:inset 7px 0 0 rgba(255,255,255,.5)}
.main-nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.main-nav a{padding:9px 12px;border:1px solid transparent;color:#31444c;font-size:14px}
.main-nav a:hover{border-color:var(--line);background:rgba(255,250,240,.74)}
.menu-button{display:none;border:1px solid var(--ink);background:var(--paper-2);color:var(--ink);padding:8px 12px;font-weight:800}
.catalog-hero{max-width:1240px;margin:0 auto;padding:58px clamp(18px,4vw,34px) 40px;display:grid;grid-template-columns:minmax(0,.9fr) minmax(420px,1.1fr);gap:34px;align-items:center}
.hero-copy{position:relative;z-index:2;padding:34px 0}
.kicker,.section-heading span,.inner-mast span{display:inline-flex;text-transform:uppercase;letter-spacing:.08em;font-size:12px;font-weight:900;color:var(--red);border-bottom:2px solid var(--red);margin-bottom:14px}
h1,h2,h3,p{margin-top:0}
.hero-copy h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(38px,6vw,86px);line-height:.98;margin-bottom:22px;max-width:760px}
.hero-copy p{font-size:clamp(17px,2vw,22px);color:#30434b;max-width:690px}
.hero-actions,.cta-shelf{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.ink-button,.paper-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 18px;font-weight:900;border:2px solid var(--ink)}
.ink-button{background:var(--ink);color:#fff}
.paper-button{background:var(--paper-2);color:var(--ink)}
.hero-plate{position:relative;margin:0;border:1px solid var(--line);background:var(--paper-2);padding:12px;box-shadow:var(--shadow);transform:rotate(.35deg)}
.hero-plate img{aspect-ratio:16/9;object-fit:cover;border:1px solid rgba(16,41,54,.18)}
.hero-plate figcaption{position:absolute;right:24px;bottom:24px;background:rgba(255,250,240,.9);border:1px solid var(--line);padding:8px 12px;font-size:13px;font-weight:800;color:#425058}
.ledger-strip{max-width:1180px;margin:0 auto 34px;padding:0 clamp(18px,4vw,34px);display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--ink);background:var(--paper-2)}
.ledger-ticket{min-height:118px;padding:18px;border-right:1px solid var(--ink);display:flex;flex-direction:column;justify-content:space-between}
.ledger-ticket:last-child{border-right:0}
.ledger-ticket span{font-size:13px;color:var(--red);font-weight:900}
.ledger-ticket b{font-size:18px;line-height:1.35}
.paper-section,.ink-section,.article-rack,.faq-block{max-width:1180px;margin:0 auto 36px;padding:38px clamp(18px,4vw,34px);position:relative}
.paper-section{background:rgba(255,250,240,.72);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.ink-section{background:#12303d;color:#f9f4ea;border:1px solid rgba(255,255,255,.2)}
.ink-section .section-heading p{color:#d8e2e4}
.section-heading{max-width:740px;margin-bottom:24px}
.section-heading h2{font-family:Georgia,"Times New Roman",serif;font-size:clamp(28px,4vw,48px);line-height:1.08;margin-bottom:10px}
.section-heading p{color:var(--muted);font-size:17px}
.plan-ledger{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--ink);background:var(--paper-2)}
.plan-slip{padding:20px;border-right:1px solid var(--ink);min-height:230px;display:flex;flex-direction:column;gap:12px}
.plan-slip:last-child{border-right:0}
.plan-slip span{display:inline-flex;color:var(--red);font-weight:900;font-size:13px}
.plan-slip h3{font-size:22px;line-height:1.25;margin:0}
.plan-slip p{color:#536168;margin:0}
.plan-slip b{margin-top:auto;color:var(--ink)}
.device-shelf,.device-columns{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.device-card,.platform-slip,.issue-slip,.article-card,.node-ledger article,.device-columns article,.step-strip article,.contact-panel>div{background:rgba(255,250,240,.92);color:var(--ink);border:1px solid var(--line);box-shadow:0 10px 30px rgba(43,33,20,.08)}
.device-card{padding:20px;min-height:170px}
.device-card h3,.platform-slip h2,.issue-slip h2,.device-columns h2{margin-bottom:10px;font-size:21px}
.node-ledger{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:12px}
.node-ledger article{padding:18px}
.node-ledger article:first-child{grid-row:span 2;background:#fff7e9}
.node-ledger span{display:block;color:var(--teal);font-weight:850}
.article-rack{background:#ece1cf;border:1px solid var(--line)}
.article-cards{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.article-card a{display:flex;flex-direction:column;gap:10px;min-height:250px;padding:18px}
.article-card time{font-size:13px;color:#6a6f73}
.article-card span{width:max-content;max-width:100%;font-size:12px;font-weight:900;color:#fff;background:var(--red);padding:4px 8px}
.article-card h3{font-size:18px;line-height:1.35;margin:0}
.article-card p{color:#59636a;margin:0}
.faq-block{background:#fbf5eb}
.faq-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.faq-list details{border:1px solid var(--line);background:#fffaf0;padding:16px}
.faq-list summary{cursor:pointer;font-weight:900}
.faq-list p{margin:10px 0 0;color:#536168}
.subpage{padding:42px clamp(18px,4vw,34px)}
.inner-mast{max-width:1180px;margin:0 auto 28px;border:1px solid var(--ink);background:var(--paper-2);padding:34px;box-shadow:var(--shadow)}
.inner-mast h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(34px,5vw,64px);line-height:1.05;margin-bottom:14px}
.inner-mast p{font-size:18px;color:#43525a;max-width:780px}
.catalog-table{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--ink);background:var(--paper-2)}
.catalog-table div{padding:18px;border-right:1px solid var(--ink);border-bottom:1px solid var(--line)}
.catalog-table div:nth-child(4n){border-right:0}
.catalog-table b{display:block;margin-bottom:8px;font-size:18px}
.catalog-table p{margin:0;color:#55646b}
.platform-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.platform-slip{padding:22px}
.platform-slip ul,.device-columns ul{margin:12px 0 0;padding-left:20px;color:#4f5d64}
.step-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.step-strip article{padding:18px}
.issue-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.issue-slip{padding:18px}
.device-columns article{padding:20px}
.contact-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-panel>div{padding:22px}
.article-page{max-width:920px;margin:0 auto;padding:46px clamp(18px,4vw,34px)}
.article-paper{background:#fffaf0;border:1px solid var(--ink);padding:clamp(24px,5vw,54px);box-shadow:var(--shadow)}
.article-paper header{border-bottom:3px double var(--line);margin-bottom:28px;padding-bottom:20px}
.article-paper time,.article-paper header span{display:inline-flex;margin-right:10px;color:var(--red);font-weight:900;font-size:13px}
.article-paper h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(32px,5vw,56px);line-height:1.08;margin:12px 0}
.article-paper header p{font-size:18px;color:#4b5d65}
.article-paper h2{font-size:25px;margin:26px 0 8px}
.article-paper p{color:#394a52}
.back-link{display:inline-flex;margin-bottom:10px;color:var(--teal);font-weight:900}
.related-links{display:flex;flex-wrap:wrap;gap:10px;border-top:1px solid var(--line);margin-top:28px;padding-top:18px}
.related-links a{border:1px solid var(--ink);padding:8px 12px;background:#fff}
.catalog-footer{margin:42px auto 0;max-width:1180px;padding:30px clamp(18px,4vw,34px);border-top:3px double var(--ink);display:grid;grid-template-columns:.9fr 1.5fr;gap:28px}
.footer-mark{display:flex;gap:14px;align-items:flex-start}
.seal{width:34px;height:34px;border:2px solid var(--ink);background:linear-gradient(135deg,var(--red),var(--brass))}
.footer-mark p{margin:6px 0 0;color:#526169}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.footer-grid b,.footer-grid a{display:block}
.footer-grid b{margin-bottom:8px}
.footer-grid a{color:#44565e;margin:5px 0}
@media (max-width:980px){
  .catalog-hero{grid-template-columns:1fr;padding-top:34px}
  .hero-copy{padding-bottom:0}
  .hero-plate{order:-1}
  .ledger-strip,.plan-ledger,.device-shelf,.article-cards,.catalog-table,.footer-grid{grid-template-columns:repeat(2,1fr)}
  .ledger-ticket:nth-child(2n),.plan-slip:nth-child(2n),.catalog-table div:nth-child(2n){border-right:0}
  .node-ledger,.issue-grid{grid-template-columns:1fr 1fr}
  .node-ledger article:first-child{grid-row:auto}
  .catalog-footer{grid-template-columns:1fr}
}
@media (max-width:720px){
  .topbar{align-items:flex-start}
  .menu-button{display:inline-flex}
  .main-nav{display:none;position:absolute;left:16px;right:16px;top:62px;background:var(--paper-2);border:1px solid var(--ink);padding:10px;box-shadow:var(--shadow)}
  .main-nav.is-open{display:grid;grid-template-columns:1fr 1fr}
  .brand-lockup span:last-child{max-width:180px;overflow:hidden;text-overflow:ellipsis}
  .hero-copy h1{font-size:40px;line-height:1.05}
  .hero-plate figcaption{position:static;margin-top:10px}
  .ledger-strip,.plan-ledger,.device-shelf,.article-cards,.catalog-table,.platform-grid,.step-strip,.issue-grid,.faq-list,.device-columns,.contact-panel,.footer-grid{grid-template-columns:1fr}
  .ledger-ticket,.plan-slip,.catalog-table div{border-right:0}
  .ledger-ticket{border-bottom:1px solid var(--ink)}
  .ledger-ticket:last-child{border-bottom:0}
  .paper-section,.ink-section,.article-rack,.faq-block{padding:28px 16px}
  .inner-mast{padding:24px}
  .subpage{padding:28px 16px}
}