/* Reading-first storefront: the original sheet layouts stay intact. */
:root{--taobao:#ff5000;--taobao-hover:#fff5ef;--taobao-ink:#bd3b00;--page-ink:#182339;--page-muted:#69778d;--page-blue:#2563eb;--page-line:#e1e7f0}
body{background:#f7f9fc;color:var(--page-ink)}
.taobao-logo{display:inline-block;width:24px;height:24px;flex:0 0 24px;vertical-align:middle;border-radius:5px}
.guide-masthead{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid var(--page-line)}
.masthead-inner{width:min(1180px,calc(100% - 48px));min-height:72px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}
.guide-brand{display:flex;align-items:center;gap:12px;color:var(--page-ink);text-decoration:none;white-space:nowrap}
.guide-brand strong{font-size:18px;font-weight:650;letter-spacing:.5px}
.guide-brand .brand-model{font-size:12px;letter-spacing:1.2px;color:var(--page-muted);margin-left:4px}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--page-blue);color:#fff}
.brand-mark svg{width:24px;height:24px}
.guide-links{display:flex;gap:24px;font-size:14px;font-weight:500;white-space:nowrap}
.guide-links a{color:var(--page-muted);text-decoration:none;padding:8px 0}
.guide-links a:hover{color:var(--page-blue)}
.shop-button{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:48px;padding:11px 22px;background:#fff;border:1px solid var(--taobao);border-radius:5px;color:var(--taobao-ink);text-decoration:none;font-size:16px;font-weight:600;line-height:1.5;white-space:normal;text-align:center;transition:background .15s}
.shop-button:hover{background:var(--taobao-hover)}
.shop-button:focus-visible{outline:2px solid var(--taobao-ink);outline-offset:4px}
.shop-text-link{display:inline-flex;align-items:center;gap:6px;color:var(--taobao-ink);font-weight:600;vertical-align:middle}
.shop-text-link .taobao-logo{width:20px;height:20px;flex-basis:20px}
.guide-intro{padding:22px 0 34px;margin-bottom:36px;border-bottom:1px solid var(--page-line)}
.guide-eyebrow{margin:0 0 12px;color:var(--page-muted);font-size:13px;font-weight:500;letter-spacing:1.1px;line-height:1.6}
.guide-intro h1{font-size:clamp(28px,3vw,36px);font-weight:650;line-height:1.35;letter-spacing:-.5px;margin:0 0 18px}
.guide-intro h1>span{display:inline-block}
.guide-summary{max-width:880px;font-size:17px;line-height:1.9;margin:0 0 13px;color:var(--page-muted)}
.guide-summary strong{font-weight:500}
.intro-purchase{display:flex;align-items:center;flex-wrap:wrap;gap:14px 22px;margin-top:24px}
.intro-purchase p{margin:0;color:var(--page-muted);font-size:16px;line-height:1.8}
.intro-purchase strong{color:var(--page-ink);font-weight:650}
.shop-status{font-size:13px;color:var(--muted);line-height:1.8;margin:10px 0 0}
.shop-section,.guide-faq{margin-top:40px;padding:32px 0;border-top:1px solid var(--page-line)}
.shop-section h2,.guide-faq h2{font-size:28px;line-height:1.5;font-weight:550;margin:0 0 18px}
.shop-section>p:not(.guide-eyebrow):not(.purchase-note):not(.shop-status){max-width:900px;font-size:17px;line-height:1.9;margin:0 0 22px}
.purchase-note{font-size:13px;color:var(--muted);margin:12px 0 0;line-height:1.8}
.shop-facts{margin:0 0 24px;padding:0;font-size:16px;line-height:1.9;max-width:900px}
.shop-facts>div{display:grid;grid-template-columns:100px 1fr;gap:18px;padding:11px 0;border-bottom:1px solid #dce3e7}
.shop-facts dt{font-weight:500;color:var(--muted)}.shop-facts dd{margin:0}
.guide-faq dl{margin:0;max-width:980px}.guide-faq dt{font-size:18px;font-weight:550;line-height:1.7;margin:24px 0 8px}.guide-faq dd{font-size:16px;line-height:1.9;margin:0;color:var(--muted)}
.assembly-sheet{scroll-margin-top:88px}.terminal-guide,.terminal-section,.shop-section,.guide-faq{scroll-margin-top:88px}
@media(max-width:700px){.masthead-inner{width:calc(100% - 32px);min-height:60px;gap:8px}.guide-brand{gap:0}.guide-brand strong{font-size:16px}.guide-brand>span{display:none}.guide-intro{padding:22px 8px 28px;margin-bottom:20px}.guide-eyebrow{font-size:12px;letter-spacing:.7px}.guide-summary{font-size:16px;line-height:1.85}.intro-purchase{margin-top:20px;gap:12px}.intro-purchase>.shop-button{width:100%}.intro-purchase p{font-size:15px}.shop-section,.guide-faq{padding:26px 8px;margin-top:26px}.shop-section h2,.guide-faq h2{font-size:24px}.shop-section>p:not(.guide-eyebrow):not(.purchase-note):not(.shop-status){font-size:16px}.shop-facts>div{grid-template-columns:72px 1fr;gap:12px}.shop-facts{font-size:15px}.guide-faq dt{font-size:17px}.guide-faq dd{font-size:15px}.assembly-sheet,.terminal-guide,.terminal-section,.shop-section,.guide-faq{scroll-margin-top:76px}}
@media print{.guide-masthead,.intro-purchase,.shop-status,.shop-section{display:none!important}.guide-intro{padding:0 0 20px}.guide-faq{break-before:page}}

/* Materials use the reference project's card layout, outside the original sheets. */
.materials-section{margin:0 0 56px;scroll-margin-top:96px}
.materials-heading{margin-bottom:24px}
.section-kicker{margin:0 0 7px;font-size:13px;font-weight:600;line-height:1.6;color:var(--page-blue)}
.materials-heading h2{margin:0 0 10px;font-size:32px;font-weight:650;letter-spacing:-.5px;line-height:1.4}
.materials-heading h2 span{color:var(--page-blue)}
.materials-description{margin:0;color:var(--page-muted);font-size:14px;line-height:1.8}
.materials-local-note{margin:5px 0 0;color:var(--page-muted);font-size:12px;line-height:1.7}
.materials-filter{display:flex;align-items:center;justify-content:flex-end;margin:0 0 16px}
.materials-filter-label{display:inline-flex;align-items:center;gap:9px;min-height:42px;padding:8px 13px;border:1px solid var(--page-line);border-radius:9px;background:#fff;color:var(--page-ink);font-size:14px;line-height:1.6;cursor:pointer}
.materials-filter-label:hover{border-color:#b6caf8}
.materials-filter-label input{width:17px;height:17px;margin:0;flex-shrink:0;accent-color:var(--page-blue);cursor:pointer}
.materials-filter-label input:focus-visible{outline:2px solid var(--page-blue);outline-offset:3px}
.materials-empty{padding:32px 20px;border:1px solid var(--page-line);border-radius:11px;background:#fff;text-align:center}
.materials-empty p{margin:0 0 14px;color:var(--page-ink);font-size:16px;font-weight:600;line-height:1.7}
.materials-empty button{min-height:42px;padding:8px 16px;border:1px solid #c2d3fa;border-radius:8px;color:var(--page-blue);background:#fff;font-size:14px;line-height:1.6}
.materials-empty button:hover{background:#f5f8ff;border-color:#91aff5}
.materials-empty button:focus-visible{outline:2px solid var(--page-blue);outline-offset:3px}
.materials-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px;margin:0;padding:0;list-style:none}
.material-card{min-width:0;background:#fff;border:1px solid var(--page-line);border-radius:11px;overflow:hidden;transition:border-color .15s,box-shadow .15s}
.material-card:hover{border-color:#b6caf8;box-shadow:0 3px 14px #18233908}
.material-photo{display:block;aspect-ratio:4/3;background:#f0f2f5;overflow:hidden;cursor:zoom-in}
.material-photo:focus-visible{outline:3px solid var(--page-blue);outline-offset:-3px}
.material-photo img{display:block;width:100%;height:100%;object-fit:contain}
.material-name{display:flex;align-items:center;min-height:54px;margin:0;padding:13px 14px;font-size:14px;font-weight:600;line-height:1.65;overflow-wrap:anywhere}
.photo-tone-definitions{position:absolute;width:0;height:0;overflow:hidden;pointer-events:none}
.material-photo img,.material-dialog-image{filter:url(#material-photo-light)}
.material-card-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 12px;min-height:54px}
.material-card-footer .material-name{min-height:0;padding:0;flex:1}
.material-confirm{display:inline-flex;align-items:center;gap:5px;min-height:36px;flex-shrink:0;cursor:pointer;color:var(--page-muted);font-size:12px;line-height:1.4}
.material-confirm input{width:17px;height:17px;margin:0;accent-color:var(--page-blue);cursor:pointer;flex-shrink:0}
.material-confirm input:focus-visible{outline:2px solid var(--page-blue);outline-offset:3px}
.material-card.is-confirmed{border-color:#91aff5}
.material-card.is-confirmed .material-confirm{color:var(--page-blue);font-weight:600}
.assembly-section{scroll-margin-top:96px}
#assembly-sheets{scroll-margin-top:96px}
body.material-dialog-open{overflow:hidden}
.material-dialog{width:min(800px,calc(100% - 40px));max-width:none;max-height:calc(100dvh - 40px);margin:auto;padding:0;border:1px solid var(--page-line);border-radius:14px;background:#fff;color:var(--page-ink);box-shadow:0 24px 80px #0f172a33;overflow:auto;overscroll-behavior:contain}
.material-dialog::backdrop{background:#11182799}
.material-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px 12px 20px}
.material-dialog-header h2{margin:0;font-size:17px;font-weight:600;line-height:1.6}
.material-dialog-close{display:grid;place-items:center;flex:0 0 40px;width:40px;height:40px;border-radius:50%;background:#f3f5f8;color:var(--page-muted)}
.material-dialog-close:hover{background:#e8edf5;color:var(--page-ink)}
.material-dialog-close:focus-visible{outline:2px solid var(--page-blue);outline-offset:2px}
.material-dialog-image{display:block;width:100%;max-height:calc(100dvh - 120px);object-fit:contain;background:#f7f9fc}
@media(max-width:1000px){.materials-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){
  main,.masthead-inner{width:calc(100% - 32px)}
  .masthead-inner{min-height:64px;gap:12px}
  .guide-brand{gap:9px}.guide-brand strong{font-size:16px}.guide-brand .brand-mark{display:grid;width:32px;height:32px;border-radius:10px}.guide-brand .brand-model{display:none}
  .guide-links{gap:16px;font-size:13px}
  .guide-intro{padding:12px 0 28px;margin-bottom:28px}
  .guide-intro h1{font-size:28px}
  .shop-section,.guide-faq{padding-left:0;padding-right:0}
  .materials-section{margin-bottom:36px;scroll-margin-top:84px}
  .materials-heading{margin-bottom:20px}.materials-heading h2{font-size:27px}.materials-description{font-size:13px}
  .materials-filter{margin-bottom:13px}.materials-filter-label{min-height:44px;font-size:13px}.materials-empty{padding:26px 16px}
  .materials-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}
  .material-name{padding:11px 12px;font-size:13px;min-height:50px}
  .material-card-footer{flex-wrap:wrap;gap:2px 8px;padding:9px 10px;align-content:start}
  .material-card-footer .material-name{flex-basis:100%;padding:0;min-height:0}
  .material-confirm{min-height:32px}
  .assembly-section{scroll-margin-top:84px}
  .material-dialog{width:calc(100% - 24px);max-height:calc(100dvh - 24px);border-radius:12px}
  .material-dialog-header{padding:10px 10px 10px 14px}.material-dialog-header h2{font-size:15px}
  #assembly-sheets{scroll-margin-top:84px}
}
@media(max-width:380px){.guide-links{gap:12px;font-size:12px}.guide-brand{gap:7px}.guide-brand strong{font-size:15px}.materials-grid{gap:10px}.material-name{padding:10px;font-size:13px}.materials-heading h2{font-size:25px}}
@media print{.material-dialog,.material-confirm,.materials-filter,.materials-empty{display:none!important}.materials-grid,.materials-grid[hidden]{display:grid!important;grid-template-columns:repeat(4,minmax(0,1fr))}.material-card{break-inside:avoid}.material-card[hidden]{display:block!important}.materials-section{break-after:page}}