:root{--bg:#F4EDE0;--deep:#E4D6C0;--paper:#FBF6EC;--sub:#EDE3D0;--ink:#1C160C;--text:#2A2214;--muted:#5A4A30;--soft:#7A6848;--gold:#8A6A28;--copper:#C49A3C;--line:rgba(28,22,12,.12);--focus:rgba(138,106,40,.5);--shadow:0 12px 28px rgba(28,22,12,.08);--max:960px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.skip-link{position:fixed;left:10px;top:-50px;z-index:500;background:var(--paper);padding:8px 12px;border:1px solid var(--gold)}.skip-link:focus{top:8px}.top-strip{position:fixed;top:0;left:0;right:0;height:20px;background:var(--ink);color:var(--copper);z-index:120}.top-strip-inner,.header-inner,.needle-inner,.footer-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto}.top-strip-inner{height:20px;display:flex;align-items:center;justify-content:space-between;font-size:12px;line-height:1}.text-button{border:0;background:transparent;color:var(--copper);min-height:20px;padding:0 6px}.site-header{position:fixed;top:20px;left:0;right:0;height:54px;background:var(--paper);border-bottom:1px solid rgba(138,106,40,.35);z-index:115}.header-inner{height:54px;display:flex;align-items:center;justify-content:space-between}.brand-link{display:flex;align-items:center;gap:8px;min-height:44px;font-weight:700;font-size:16px}.brand-image-slot,.footer-logo-slot,.drawer-logo-slot{display:inline-flex;align-items:center;justify-content:center;min-width:24px;min-height:24px}.brand-logo,.footer-logo,.drawer-logo{height:24px;width:auto;max-width:140px;object-fit:contain;object-position:center}.brand-image-slot:empty{display:none}.brand-image-slot:not(:empty)+.brand-fallback{display:none}.header-actions{display:flex;align-items:center;gap:8px}.header-app-link,.menu-button{display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 14px;border:1px solid var(--gold);background:var(--paper);color:var(--ink);border-radius:2px;font-size:14px}.menu-button{min-width:58px}.needle-nav{position:fixed;top:74px;left:0;right:0;height:44px;background:var(--paper);border-bottom:1px solid var(--line);z-index:110}.needle-inner{height:44px;display:flex;align-items:center;gap:28px}.needle-link{height:36px;display:flex;align-items:center;gap:9px;min-width:120px;font-size:13px}.needle{width:3px;height:22px;background:var(--ink);display:block}.needle-link.active .needle{background:var(--copper)}.needle-link.active{font-weight:700}.site-main{padding:146px 16px 56px;min-height:70vh}.content-wrap{width:min(var(--max),100%);margin:0 auto}.page-head{margin:0 0 28px}.page-head .eyebrow,.section-label{display:inline-block;color:var(--gold);font-size:13px;font-weight:700;letter-spacing:.04em;margin-bottom:8px}.page-head h1,h1{font-size:24px;line-height:1.3;color:var(--ink);margin:0 0 14px}.page-head p{max-width:760px;margin:0;color:var(--muted)}h2{font-size:20px;line-height:1.4;color:var(--ink);margin:0 0 12px}h3{font-size:16px;line-height:1.45;color:var(--ink);margin:0 0 8px}p{margin:0 0 14px}.lead{font-size:16px;color:var(--muted)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:2px;font-size:14px}.btn-primary{background:linear-gradient(135deg,#1C160C 0%,#C49A3C 100%);color:var(--paper);border:1px solid var(--ink)}.btn-secondary{background:var(--paper);color:var(--ink);border:1px solid var(--gold)}a:hover,.text-button:hover,button:hover{filter:brightness(.96)}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.panel{background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:2px}.image-slot{display:flex;align-items:center;justify-content:center;background:var(--paper);border:1px solid var(--line);overflow:hidden}.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.home-intro{padding:26px 0 36px;border-bottom:1px solid var(--line)}.home-needles{display:flex;gap:26px;margin-bottom:22px}.home-needles a{display:flex;align-items:center;gap:9px}.home-needles span{width:3px;height:24px;background:var(--copper)}.home-needles b{font-size:13px}.home-section{padding:38px 0;border-bottom:1px solid var(--line)}.split-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}.split-card{padding:18px}.split-card .image-slot{height:176px;margin-bottom:14px}.single-records{display:grid;gap:14px}.record{padding:18px;border-left:3px solid var(--gold);background:var(--paper)}.record.with-image{display:grid;grid-template-columns:210px 1fr;gap:18px;align-items:center}.record .image-slot{height:150px}.fold-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;perspective:800px}.fold-card{padding:20px;background:linear-gradient(90deg,var(--paper) 0 49.5%,var(--sub) 50% 100%);border:1px solid var(--line);box-shadow:var(--shadow)}.fold-card .image-slot{height:170px;margin-bottom:14px;background:var(--paper)}.shelf-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}.shelf-card{padding:20px;border-top:4px solid var(--gold);background:var(--paper)}.shelf-head-image{height:180px;margin-bottom:16px}.phase-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.phase{padding:18px;background:var(--paper);border:1px solid var(--line)}.phase strong{display:block;color:var(--gold);margin-bottom:8px}.status-stack{display:grid;gap:10px}.status-item{display:grid;grid-template-columns:110px 1fr;gap:18px;padding:15px 18px;border:1px solid var(--line);background:var(--paper)}.status-tag{font-weight:700;color:var(--gold)}.app-home{display:grid;grid-template-columns:320px 1fr;gap:28px;align-items:center}.app-visual{display:grid;gap:10px;justify-items:center}.app-main-slot{width:100%;height:320px}.app-icon-slot{width:64px;height:64px}.app-icon-slot img{width:48px;height:48px;object-fit:contain}.method-points,.faq-six{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.method-points article,.faq-six article{padding:18px;background:var(--paper);border:1px solid var(--line)}.brand-block{padding:22px;background:var(--ink);color:var(--bg);border-left:5px solid var(--copper)}.brand-block h2{color:var(--copper)}
/* inner layouts */
.record-stack{display:grid;gap:16px}.record-stack article{padding:20px;background:var(--paper);border-left:3px solid var(--gold)}.record-stack .image-slot{height:220px;margin:4px 0 14px}.split-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.split-grid article{padding:22px;background:var(--paper);border:1px solid var(--line)}.split-grid .image-slot{height:230px;margin-bottom:16px}.fold-page-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.fold-page{padding:22px;background:linear-gradient(90deg,var(--paper) 0 49.4%,var(--sub) 49.7% 50.3%,var(--paper) 50.6% 100%);border:1px solid var(--line)}.fold-page .image-slot{height:220px;margin-bottom:18px}.plain-column{display:grid;gap:18px}.plain-column article{padding:0 0 18px;border-bottom:1px solid var(--line)}.plain-column .image-slot{height:250px;margin-bottom:18px}.three-phase-page{display:grid;gap:18px}.phase-wide{display:grid;grid-template-columns:140px 1fr;gap:22px;padding:22px;background:var(--paper);border:1px solid var(--line)}.phase-wide strong{font-size:18px;color:var(--gold)}.three-phase-page .image-slot{height:230px}.status-list{display:grid;gap:12px}.status-row{display:grid;grid-template-columns:140px 1fr;gap:20px;padding:18px 20px;background:var(--paper);border-left:4px solid var(--gold)}.memo-list{counter-reset:memo;display:grid;gap:14px}.memo-list article{counter-increment:memo;position:relative;padding:18px 20px 18px 62px;background:var(--paper);border:1px solid var(--line)}.memo-list article:before{content:counter(memo,decimal-leading-zero);position:absolute;left:18px;top:17px;color:var(--gold);font-weight:700}.memo-list .image-slot{height:240px;margin:0 0 18px}.method-steps{display:grid;gap:0;border-top:1px solid var(--line)}.method-step{display:grid;grid-template-columns:70px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.method-step b{font-size:24px;color:var(--copper)}.topic-list{display:grid;gap:12px}.topic-list article{display:grid;grid-template-columns:190px 1fr;gap:20px;padding:20px;background:var(--paper);border:1px solid var(--line)}.topic-index{color:var(--gold);font-size:13px;font-weight:700}.center-cards{display:grid;gap:16px;max-width:760px;margin:0 auto}.center-card{text-align:center;padding:24px;background:var(--paper);border:1px solid var(--line)}.center-card .image-slot{height:230px;margin:0 auto 16px}.app-split{display:grid;grid-template-columns:330px 1fr;gap:32px;align-items:start}.app-split .app-main-slot{height:320px}.app-copy{display:grid;gap:16px}.app-copy article{padding-bottom:16px;border-bottom:1px solid var(--line)}.clause-list{display:grid;gap:18px}.clause{padding:20px;background:var(--paper);border-top:3px solid var(--gold)}.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.help-grid article{padding:20px;background:var(--paper);border:1px solid var(--line)}.contact-options{display:grid;grid-template-columns:1fr 1fr;gap:16px}.contact-options article{padding:20px;background:var(--paper);border:1px solid var(--line)}.faq-list{display:grid;gap:12px}.faq-item{padding:20px;background:var(--paper);border:1px solid var(--line)}.faq-item h2{font-size:16px}.about-banner{height:200px;margin-bottom:24px}.about-sections{display:grid;gap:18px}.about-sections article{padding:20px;background:var(--paper);border-left:4px solid var(--gold)}.brand-visual{height:220px;margin-top:18px}.install-steps{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.install-steps article{padding:20px;background:var(--paper);border:1px solid var(--line)}
.site-footer{background:var(--ink);color:var(--bg);border-top:1px solid var(--copper);padding:34px 0 78px;font-size:13px}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:24px}.footer-brand strong{color:var(--copper);font-size:16px}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.footer-groups section{display:flex;flex-direction:column;gap:7px}.footer-groups h2{font-size:13px;color:var(--copper);margin:0 0 4px}.footer-note{margin-top:26px;color:#d8cfbd;max-width:760px}.copyright{color:#b8ad97}.page-overlay{position:fixed;inset:0;background:rgba(28,22,12,.42);z-index:180;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.page-overlay.open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;left:50%;bottom:22px;transform:translate(-50%,24px);width:280px;max-height:340px;background:var(--paper);z-index:210;border:1px solid var(--gold);box-shadow:0 22px 56px rgba(28,22,12,.25);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.site-drawer.open{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}.drawer-head{height:54px;display:flex;align-items:center;justify-content:space-between;padding:0 12px;border-bottom:1px solid var(--line)}.drawer-brand{display:flex;align-items:center;gap:8px}.close-button{min-height:44px;padding:0 12px;border:1px solid var(--gold);background:var(--paper);color:var(--ink)}.drawer-scroll{overflow:auto;max-height:286px;padding:10px 12px 16px}.drawer-scroll section+section{margin-top:10px}.drawer-scroll h2{font-size:13px;color:var(--gold);margin:5px 0}.drawer-scroll a{display:block;padding:9px 4px;border-bottom:1px solid var(--line)}.drawer-scroll a strong{display:block;font-size:13px}.drawer-scroll a span{display:block;font-size:12px;color:var(--muted);line-height:1.45}.search-layer{position:fixed;top:74px;left:0;right:0;z-index:205;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-layer.open{opacity:1;visibility:visible;pointer-events:auto}.search-card{width:min(620px,calc(100% - 32px));margin:10px auto 0;padding:18px;background:var(--paper);border:1px solid var(--gold);box-shadow:var(--shadow)}.search-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.search-card label{display:block;margin-bottom:8px;color:var(--muted)}.search-card input{width:100%;height:44px;border:1px solid var(--gold);background:#fffdf7;color:var(--ink);padding:0 12px}.search-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.search-links a{display:inline-flex;align-items:center;min-height:40px;padding:0 12px;border:1px solid var(--line);background:var(--sub)}.search-empty{font-size:13px;color:var(--muted);margin:12px 0 0}.mobile-bottom{display:none}.layer-open{overflow:hidden}
@media(max-width:720px){.top-strip-inner,.header-inner,.needle-inner,.footer-inner{width:calc(100% - 32px)}.needle-nav{display:none}.site-main{padding-top:102px;padding-bottom:84px}.brand-fallback{font-size:15px}.header-app-link,.menu-button{padding:0 10px}.split-cards,.fold-grid,.shelf-cards,.phase-grid,.method-points,.faq-six,.split-grid,.fold-page-grid,.help-grid,.contact-options,.install-steps{grid-template-columns:1fr}.record.with-image,.app-home,.app-split,.topic-list article{grid-template-columns:1fr}.record .image-slot{height:190px}.status-item,.status-row,.phase-wide,.method-step{grid-template-columns:1fr;gap:8px}.app-main-slot,.app-split .app-main-slot{height:300px}.footer-groups{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:86px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:150;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:var(--paper);border-top:1px solid var(--gold)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px}.mobile-bottom a.active{background:var(--gold);color:var(--paper)}.site-drawer{width:88%;bottom:calc(58px + env(safe-area-inset-bottom));max-height:340px}.search-layer{inset:0;background:var(--ink);top:0;color:var(--copper)}.search-card{width:100%;height:100%;margin:0;border:0;background:var(--ink);padding:24px 16px;color:var(--copper)}.search-card label{color:var(--bg)}.search-head strong{color:var(--copper)}.search-card .close-button{background:transparent;color:var(--copper);border-color:var(--copper)}.search-card input{background:var(--paper)}.search-links a{background:transparent;border-color:var(--copper);color:var(--copper)}.search-empty{color:var(--bg)}.page-overlay.open{z-index:170}.site-drawer{z-index:220}.mobile-bottom{z-index:150}}
@media(max-width:420px){.header-actions{gap:5px}.header-app-link,.menu-button{padding:0 8px;font-size:13px}.footer-groups{grid-template-columns:1fr}.site-main{padding-left:16px;padding-right:16px}}