/* Original documents, generous spacing, and a quiet editorial rhythm. */
@font-face{font-family:FeiyangPatentChinese;src:url('/assets/patents/chinese-records.woff') format('woff');font-weight:100 900;font-style:normal;font-display:swap}
#patent-detail-title,#patent-detail-holder,.patent-archive-note>div>p{font-family:FeiyangPatentChinese,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
.patent-hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);align-items:center;gap:clamp(46px,7vw,112px);padding-top:64px;padding-bottom:62px}
.patent-hero-copy h1{font-size:clamp(58px,6.2vw,88px);line-height:1.02;letter-spacing:-.055em;margin-bottom:28px}
.patent-hero-copy>p{font-size:1.1875rem;line-height:1.7;max-width:520px;margin-bottom:30px}
.patent-hero-copy .actions{gap:22px}
.patent-hero-document{margin:0;padding:30px 35px 25px;background:#f5f5f7;border-radius:26px}
.patent-hero-document>a{display:block;max-width:360px;margin:auto}
.patent-hero-document img{width:100%;height:auto;box-shadow:0 16px 32px #0000000d;border-radius:2px;transition:transform .6s ease}
.patent-hero-document>a:hover img{transform:translateY(-4px)}
.patent-hero-document figcaption{display:grid;gap:7px;margin-top:24px;font-size:.8125rem;line-height:1.55;color:var(--muted)}
.patent-hero-document figcaption strong{font-size:1rem;font-weight:500;color:var(--ink)}
.patent-number{font-variant-numeric:tabular-nums;letter-spacing:.005em;overflow-wrap:anywhere}
.patent-facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:30px 0 40px;border-bottom:1px solid var(--line)}
.patent-facts>div{padding:0 28px;border-left:1px solid var(--line)}
.patent-facts>div:first-child{padding-left:0;border-left:0}
.patent-facts strong{display:block;font-size:clamp(32px,3.1vw,46px);line-height:1.25;font-weight:550;letter-spacing:-.045em}
.patent-facts>div:last-child strong{font-size:clamp(25px,2.5vw,36px);line-height:1.6}
.patent-facts span{display:block;margin-top:9px;color:var(--muted);font-size:.875rem;line-height:1.5}
.patent-stories{padding-top:126px;padding-bottom:115px}
.patent-section-heading{max-width:840px;margin-bottom:72px}
.patent-section-heading h2{font-size:clamp(42px,4.4vw,64px);line-height:1.09;margin-bottom:23px}
.patent-section-heading>p{font-size:1.125rem;line-height:1.7;max-width:650px;margin-bottom:0}
.patent-feature{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:center;gap:clamp(48px,7vw,100px);padding-block:48px}
.patent-feature+.patent-feature{margin-top:30px}
.patent-feature--02 .patent-feature-figure{order:2}
.patent-feature--02 .patent-feature-copy{order:1}
.patent-feature-figure{margin:0;min-width:0}
.patent-drawing{aspect-ratio:5/4;display:flex;align-items:center;justify-content:center;padding:clamp(28px,4.2vw,60px);background:#f5f5f7;border-radius:24px;overflow:hidden}
.patent-drawing img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
.patent-feature-figure figcaption{margin-top:17px;font-size:.8125rem;color:var(--muted);line-height:1.7}
.patent-feature-copy h3{font-size:clamp(32px,3.1vw,44px);line-height:1.13;letter-spacing:-.04em;margin-bottom:22px}
.patent-feature-copy>p{font-size:1.0625rem;line-height:1.75;margin-bottom:25px}
.patent-feature-copy .eyebrow{margin-bottom:21px}
.patent-reference{display:block;color:var(--muted);font-size:.8125rem;line-height:1.6;margin-bottom:18px}
.patent-feature-links{display:flex;align-items:center;flex-wrap:wrap;gap:14px 24px}
.patent-archive{background:#f5f5f7;padding-block:108px 80px;scroll-margin-top:100px}
.patent-archive .patent-section-heading{margin-bottom:50px}
.patent-controls{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;padding-bottom:25px;border-bottom:1px solid #dcdcde}
.patent-type-filters{display:flex;flex-wrap:wrap;gap:8px}
.patent-type-filters button{display:inline-flex;align-items:center;gap:10px;border:1px solid #d8d8dc;border-radius:999px;padding:12px 16px;min-height:46px;font-size:.875rem;line-height:1.2;white-space:nowrap;background:transparent;color:#525257;transition:background .2s,color .2s,border-color .2s}
.patent-type-filters button>span:last-child{font-size:.8125rem;opacity:.65;font-variant-numeric:tabular-nums}
.patent-type-filters button:hover{background:#e8e8eb}
.patent-type-filters button.active{background:var(--ink);border-color:var(--ink);color:#fff}
.patent-selects{display:flex;align-items:flex-end;gap:15px}
.patent-selects label{display:grid;gap:8px;font-size:.8125rem;color:#626268}
.patent-selects select{font-size:.875rem;line-height:1.5;min-height:46px;padding:10px 34px 10px 12px;max-width:100%;color:var(--ink);border:1px solid #d8d8dc;border-radius:10px;background-color:#fff}
.patent-results-meta{min-height:67px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.patent-results-meta p{font-size:.875rem;margin:0}
#patent-reset{font-size:.875rem;background:none;border:0;padding:10px 0;color:var(--accent);line-height:1.5}
.patent-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:30px 22px}
.patent-card{min-width:0;display:flex;flex-direction:column;background:white;border-radius:18px;overflow:hidden;border:1px solid #e7e7eb}
.patent-card[hidden],#patent-reset[hidden],.patent-empty[hidden]{display:none!important}
.patent-card-preview{display:flex;align-items:center;justify-content:center;position:relative;width:100%;aspect-ratio:4/5;padding:26px;background:#eaeaec;border:0;overflow:hidden}
.patent-card-preview img{width:100%;height:100%;object-fit:contain;filter:drop-shadow(0 7px 9px #0000000e);transition:transform .55s cubic-bezier(.2,.7,.2,1)}
.patent-card-preview:hover img{transform:translateY(-4px)}
.patent-preview-label{position:absolute;bottom:15px;left:50%;transform:translateX(-50%);color:white;background:#222222dd;border-radius:999px;padding:7px 12px;font-size:.8125rem;line-height:1.3;white-space:nowrap;opacity:0;transition:opacity .2s}
.patent-card-preview:hover .patent-preview-label,.patent-card-preview:focus-visible .patent-preview-label{opacity:1}
.patent-card-copy{padding:22px 19px 20px;display:flex;flex:1;flex-direction:column}
.patent-card-type{display:flex;flex-direction:column;gap:4px;color:var(--muted);font-size:.75rem;line-height:1.5;margin-bottom:13px}
.patent-card-type>span:first-child{color:var(--ink);font-weight:500}
.patent-card h3{font-size:1.0625rem;line-height:1.4;letter-spacing:-.02em;margin:0 0 22px;font-weight:550}
.patent-card h3 button{font:inherit;line-height:inherit;text-align:left;border:0;background:none;padding:0;color:inherit}
.patent-card h3 button:hover{text-decoration:underline;text-underline-offset:4px}
.patent-card dl{display:grid;gap:11px;margin: auto 0 18px}
.patent-card dl>div{display:grid;gap:3px}
.patent-card dt{font-size:.75rem;line-height:1.5;color:var(--muted)}
.patent-card dd{font-size:.8125rem;line-height:1.5;margin:0}
.patent-pdf-link{color:var(--accent);font-size:.875rem;line-height:1.5;align-self:flex-start}
.patent-pdf-link:hover{text-decoration:underline;text-underline-offset:4px}
.patent-empty{padding:70px 0;text-align:center;font-size:1.0625rem}
.patent-archive-note{display:grid;grid-template-columns:1fr 1fr;gap:60px;border-top:1px solid #dcdcde;padding-top:32px;margin-top:55px}
.patent-archive-note>div>span{color:var(--muted);font-size:.8125rem}
.patent-archive-note p{font-size:.875rem;line-height:1.8;margin:7px 0 0}
.patent-archive-note>p{max-width:540px;margin-top:0}
.patent-closing{padding-block:110px 118px;text-align:center}
.patent-closing h2{font-size:clamp(38px,4.1vw,58px)}
.patent-closing p{font-size:1.125rem;line-height:1.7;max-width:640px;margin:0 auto 27px}
.patent-dialog{width:min(1120px,calc(100% - 48px));max-height:calc(100dvh - 56px);border:0;border-radius:22px;padding:0;background:#fff;color:var(--ink);box-shadow:0 20px 80px #00000040;overflow:auto}
.patent-dialog::backdrop{background:#00000080;backdrop-filter:blur(10px)}
.patent-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:30px;position:sticky;top:0;z-index:2;background:#ffffffed;backdrop-filter:blur(18px);padding:23px 30px;border-bottom:1px solid var(--line)}
.patent-dialog-header .eyebrow{font-size:.75rem;margin-bottom:9px}
.patent-dialog-header h2{font-size:1.5625rem;line-height:1.25;letter-spacing:-.03em;margin:0;max-width:800px}
.patent-dialog-close{flex:none;display:grid;place-items:center;width:44px;height:44px;border:0;border-radius:50%;background:#ededf0;color:#333}
.patent-dialog-close:hover{background:#dedee2}
.patent-dialog-close svg{width:22px;height:22px}
.patent-dialog-body{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:start;gap:38px;padding:32px}
.patent-dialog-paper{background:#eeeef0;padding:22px;border-radius:12px}
.patent-dialog-paper img{width:100%;height:auto;box-shadow:0 8px 25px #00000013}
.patent-dialog-details h3{font-size:1.25rem;line-height:1.3;margin-bottom:24px}
.patent-dialog-details dl{display:grid;gap:15px;margin:0 0 28px}
.patent-dialog-details dl>div{display:grid;gap:3px;min-width:0}
.patent-dialog-details dt{font-size:.8125rem;color:var(--muted);line-height:1.5}
.patent-dialog-details dd{font-size:.9375rem;line-height:1.6;margin:0;overflow-wrap:anywhere}
.zh-page .patent-hero-copy h1,.zh-page .patent-section-heading h2,.zh-page .patent-feature-copy h3{letter-spacing:-.025em;line-height:1.18}
.zh-page .patent-card h3{letter-spacing:0;line-height:1.65}
.js .patents-page .reveal{transform:translateY(18px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.js .patents-page .reveal.visible{transform:none}
@media(max-width:1100px){
 .patent-hero{gap:45px;padding-top:52px}
 .patent-hero-copy h1{font-size:clamp(54px,6.1vw,76px)}
 .patent-hero-document{padding:26px}
 .patent-controls{align-items:flex-start;flex-direction:column;gap:24px}
 .patent-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
 .patent-feature{gap:48px}
}
@media(max-width:800px){
 .patent-hero{grid-template-columns:1fr;gap:42px;padding-top:46px;padding-bottom:45px}
 .patent-hero-copy h1{font-size:clamp(48px,8.8vw,70px)}
 .patent-hero-copy>p{max-width:590px}
 .patent-hero-document{width:min(500px,100%);margin:auto;padding:30px}
 .patent-hero-document>a{max-width:300px}
 .patent-facts{grid-template-columns:1fr 1fr;gap:30px 22px}
 .patent-facts>div{padding:0 0 0 22px}
 .patent-facts>div:nth-child(3){border-left:0;padding-left:0}
 .patent-stories{padding-top:85px;padding-bottom:82px}
 .patent-section-heading{margin-bottom:36px}
 .patent-feature{grid-template-columns:1fr;gap:25px;padding-block:32px}
 .patent-feature .patent-feature-copy{order:1}
 .patent-feature .patent-feature-figure{order:2}
 .patent-feature+.patent-feature{margin-top:35px}
 .patent-feature-copy h3{max-width:520px;font-size:36px}
 .patent-feature-copy>p{max-width:600px}
 .patent-drawing{aspect-ratio:5/4;max-height:510px}
 .patent-archive{padding-block:78px 60px}
 .patent-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 18px}
 .patent-archive-note{grid-template-columns:1fr;gap:20px}
 .patent-closing{padding-block:78px 85px}
 .patent-dialog-body{grid-template-columns:1fr;gap:30px;padding:24px}
 .patent-dialog-paper{width:min(440px,100%);margin:auto}
 .patent-dialog-header{padding:20px 24px;gap:18px}
}
@media(max-width:540px){
 .patent-hero-copy h1{font-size:clamp(42px,10.2vw,54px)}
 .patent-hero-copy>p{font-size:1.0625rem;line-height:1.75}
 .patent-hero-copy .actions{gap:17px}
 .patent-hero-copy .button{padding:12px 22px}
 .patent-hero-document{padding:22px;border-radius:20px}
 .patent-hero-document figcaption{margin-top:20px}
 .patent-facts strong{font-size:38px}
 .patent-facts>div:last-child strong{font-size:27px;line-height:1.75}
 .patent-section-heading h2{font-size:clamp(35px,9.1vw,43px)}
 .patent-section-heading>p{font-size:1.0625rem}
 .patent-feature-copy h3{font-size:32px;line-height:1.2}
 .patent-feature-copy>p{font-size:1rem}
 .patent-drawing{padding:26px;border-radius:20px}
 .patent-type-filters{gap:8px}
 .patent-type-filters button{font-size:.8125rem;padding:11px 13px;gap:8px}
 .patent-selects{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);width:100%;gap:12px}
 .patent-selects label{min-width:0}
 .patent-selects select{width:100%;font-size:.8125rem;padding-left:10px;padding-right:24px}
 .patent-grid{gap:18px 12px}
 .patent-card{border-radius:13px}
 .patent-card-preview{padding:15px;aspect-ratio:4/5.5}
 .patent-card-copy{padding:17px 13px 18px}
 .patent-card h3{font-size:.9375rem;line-height:1.5;margin-bottom:20px}
 .patent-card-type{font-size:.75rem;margin-bottom:11px}
 .patent-card dd{font-size:.75rem}
 .patent-pdf-link{font-size:.8125rem}
 .patent-preview-label{display:none}
 .patent-dialog{width:calc(100% - 20px);max-height:calc(100dvh - 20px);border-radius:16px}
 .patent-dialog-header{padding:18px;align-items:flex-start}
 .patent-dialog-header h2{font-size:1.125rem;line-height:1.5}
 .patent-dialog-header .eyebrow{font-size:.75rem;letter-spacing:.1em}
 .patent-dialog-body{padding:18px;gap:26px}
 .patent-dialog-paper{padding:15px}
 .patent-dialog-details>h3{font-size:1.1875rem}
 .patent-dialog-details dd{font-size:.9375rem}
}
@media(prefers-reduced-motion:reduce){
 .patent-card-preview img,.patent-hero-document img{transition:none;transform:none!important}
 .js .patents-page .reveal{transition:none;transform:none}
}