/* Research reading system: ink, clinical blue, ice, paper, muted slate. */
.research-page{--research-ink:#17324d;--research-blue:#155c96;--research-ice:#edf5fb;--research-rule:#dce6ee;--research-muted:#687e90;color:var(--research-ink);background:#fff;font:16px/1.85 "Microsoft YaHei","PingFang SC",Arial,sans-serif;text-align:left}
.research-page *{box-sizing:border-box}.research-page a{color:inherit;text-decoration:none}.research-page a:focus-visible{outline:3px solid #357bd3;outline-offset:5px;border-radius:3px}.research-page p,.research-page h1,.research-page h2,.research-page h3{margin:0;text-align:left}.research-page h1,.research-page h2,.research-page h3{font-weight:600;color:var(--research-ink)}
.research-container{max-width:1240px;padding:0 40px;margin:0 auto}.research-masthead{padding:28px 0 52px;background:linear-gradient(115deg,#f1f7fb,#e9f3fc);border-bottom:1px solid var(--research-rule)}.research-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;line-height:1.7;color:var(--research-muted);margin-bottom:32px}.research-breadcrumb a:hover{color:var(--research-blue)}.research-page .research-eyebrow{color:var(--research-blue);font-size:12px;letter-spacing:2px;line-height:1.7;margin-bottom:13px}.research-masthead h1{font-size:42px;line-height:1.3;letter-spacing:-1px;font-family:Georgia,"Source Han Serif SC","Songti SC","SimSun",serif}.research-masthead h1 br{display:none}.research-page .research-intro{max-width:730px;margin-top:20px;line-height:1.9;color:#5a7287;font-size:16px}
.research-index-layout{display:grid;grid-template-columns:194px minmax(0,1fr);gap:54px;padding-top:52px;padding-bottom:80px}.research-sidebar{align-self:start;position:sticky;top:120px}.research-page .research-nav-label{font-size:12px;color:var(--research-muted);letter-spacing:1px;margin-bottom:14px}.research-sidebar nav>a{display:flex;justify-content:space-between;gap:12px;padding:14px 0;font-size:14px;border-bottom:1px solid var(--research-rule);line-height:1.7}.research-sidebar nav>a span{color:#98acbd}.research-sidebar nav>a:hover{color:var(--research-blue)}.research-resources{margin-top:38px}.research-resources>a{display:block;font-size:13px;line-height:1.9;margin:10px 0;color:var(--research-blue)}
.research-group{margin-bottom:48px;scroll-margin-top:120px}.research-group:last-child{margin-bottom:0}.research-group-head{border-top:2px solid var(--research-blue);padding-top:18px;margin-bottom:24px}.research-group-head h2{font-size:25px;line-height:1.6}.research-group-head p{font-size:14px;color:var(--research-muted);line-height:1.85;margin-top:5px}.research-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.research-card{display:flex;flex-direction:column;min-width:0;border:1px solid var(--research-rule);border-radius:12px;padding:25px 24px 19px;background:#fff;transition:border-color .18s,box-shadow .18s}.research-card:hover{border-color:#a4c5de;box-shadow:0 8px 25px #16344d09}.research-card-meta{display:flex;justify-content:space-between;gap:12px;color:var(--research-blue);font-size:11px;line-height:1.8;margin-bottom:16px}.research-card h3{font-size:20px;line-height:1.65;margin-bottom:12px}.research-card h3 a:hover{color:var(--research-blue)}.research-page .research-card-summary{font-size:14px;color:#657b8e;line-height:1.9;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;margin-bottom:22px}.research-card-footer{display:flex;justify-content:space-between;gap:14px;align-items:flex-end;border-top:1px solid #edf1f5;padding-top:15px;margin-top:auto;font-size:11px;line-height:1.7;color:var(--research-muted)}.research-card-footer>a{color:var(--research-blue);white-space:nowrap;font-size:12px}
.research-detail{padding-top:28px;padding-bottom:75px}.research-article-head{margin-left:232px;margin-bottom:40px;max-width:850px}.research-article-head h1{font:600 34px/1.65 Georgia,"Source Han Serif SC","Songti SC","SimSun",serif;overflow-wrap:anywhere}.research-meta-dot{padding:0 12px}.research-page .research-updated{margin-top:18px;font-size:12px;color:var(--research-muted)}.research-article-layout{display:grid;grid-template-columns:184px minmax(0,1fr);gap:48px}.research-toc{align-self:start;position:sticky;top:120px;border-left:1px solid var(--research-rule);padding-left:20px}.research-toc>a{display:block;font-size:13px;padding:8px 0;color:#637b8e;line-height:1.7}.research-toc>a:hover{color:var(--research-blue)}.research-article-body{max-width:850px;min-width:0}.research-article-body section{scroll-margin-top:120px;margin-bottom:38px}.research-article-body h2{font-size:22px;line-height:1.6;margin-bottom:17px}.research-article-body p{font-size:15px;line-height:2.05;color:#475e72;overflow-wrap:anywhere}.research-article-body .research-lead{font-size:17px;line-height:2;color:#29445d}.research-facts{display:grid;grid-template-columns:1fr 1fr;gap:20px 32px;padding:24px 0;border-top:1px solid var(--research-rule);border-bottom:1px solid var(--research-rule);margin:28px 0 0}.research-facts dt{font-size:11px;color:var(--research-muted);margin-bottom:6px}.research-facts dd{margin:0;font-size:13px;line-height:1.8;overflow-wrap:anywhere}.research-table-wrap{border:1px solid var(--research-rule);border-radius:9px;overflow:hidden}.research-page table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13px;line-height:1.9;text-align:left}.research-page th,.research-page td{padding:14px 16px;border-bottom:1px solid #e6edf3;vertical-align:top;overflow-wrap:anywhere;font-weight:400}.research-page thead th{background:#edf4fa;font-weight:600;color:#224d72}.research-page th:first-child{width:27%}.research-page td:last-child{color:var(--research-muted)}.research-page tr:last-child td,.research-page tr:last-child th{border-bottom:0}.research-study-notes{background:#f2f7fb;border-left:3px solid #8fb5d3;padding:22px 24px;border-radius:0 9px 9px 0}.research-study-notes h2{font-size:17px;margin-bottom:9px}.research-reference{border-top:1px solid var(--research-rule);padding-top:26px}.research-reference p{font-size:13px}.research-reference>a{display:inline-block;margin-top:12px;font-size:13px;color:var(--research-blue);overflow-wrap:anywhere}.research-bottom-links{display:flex;gap:24px;flex-wrap:wrap;font-size:13px;color:var(--research-blue);margin:32px 0 40px}.research-related>a{display:flex;justify-content:space-between;gap:20px;padding:16px 0;border-bottom:1px solid var(--research-rule);font-size:14px;line-height:1.8}.research-related>a:hover{color:var(--research-blue)}.research-back{font-size:13px;color:var(--research-blue)!important}.research-sr{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(min-width:1800px){.research-container{max-width:1380px}.research-card{padding:30px}.research-masthead{padding-bottom:62px}}
@media(max-width:1000px){.research-index-layout{gap:30px;grid-template-columns:170px minmax(0,1fr)}.research-card-grid{grid-template-columns:1fr}.research-article-head{margin-left:0}.research-article-layout{gap:28px;grid-template-columns:155px minmax(0,1fr)}}
@media(max-width:767px){.research-container{padding-left:22px;padding-right:22px}.research-masthead{padding-top:23px;padding-bottom:32px}.research-breadcrumb{margin-bottom:25px;font-size:11px;gap:8px}.research-masthead h1{font-size:31px;line-height:1.5}.research-masthead h1 br{display:initial}.research-page .research-intro{font-size:14px;margin-top:13px}.research-index-layout{display:block;padding-top:24px;padding-bottom:45px}.research-sidebar{position:static;margin-bottom:30px}.research-sidebar nav{display:flex;gap:8px;flex-wrap:wrap}.research-sidebar nav .research-nav-label{flex-basis:100%;margin-bottom:0}.research-sidebar nav>a{padding:7px 11px;border:1px solid var(--research-rule);border-radius:6px;font-size:12px;background:#fff}.research-sidebar nav>a span{display:none}.research-resources{display:none}.research-group{margin-bottom:34px}.research-group-head h2{font-size:22px}.research-group-head p{font-size:13px}.research-card{padding:22px}.research-card h3{font-size:19px}.research-detail{padding-top:23px;padding-bottom:45px}.research-article-head{margin-bottom:25px}.research-article-head h1{font-size:27px;line-height:1.65}.research-article-layout{display:block}.research-toc{position:static;border:1px solid var(--research-rule);border-radius:8px;background:#f7fafc;padding:16px;margin-bottom:30px;display:flex;flex-wrap:wrap;gap:6px 18px}.research-toc .research-nav-label{flex-basis:100%;margin-bottom:2px}.research-toc>a{font-size:12px;padding:3px 0}.research-article-body h2{font-size:21px}.research-article-body .research-lead{font-size:16px}.research-article-body p{font-size:14px}.research-facts{gap:18px}.research-page th,.research-page td{padding:10px 8px;font-size:12px}.research-page th:first-child{width:27%}.research-study-notes{padding:20px}.research-article-body section{scroll-margin-top:90px}}
@media(max-width:359px){.research-container{padding-left:16px;padding-right:16px}.research-masthead h1{font-size:28px}.research-card{padding:18px}.research-article-head h1{font-size:25px}.research-facts{grid-template-columns:1fr}.research-card-footer{gap:9px}}
@media(prefers-reduced-motion:reduce){.research-page *{scroll-behavior:auto!important;transition:none!important}}

.research-references{margin:16px 0 0;padding-left:22px}.research-references li{padding:10px 0 13px 5px;border-bottom:1px solid #e5edf4;font-size:13px;line-height:1.85;overflow-wrap:anywhere}.research-references a{color:#155c96;text-decoration:underline;text-decoration-color:#b6d1e7;text-underline-offset:4px}.research-references a:hover{text-decoration-color:#155c96}.research-reference-kind{display:block;color:#7b8e9f;font-size:11px;margin-top:5px}
.research-article-body section>p+p{margin-top:16px}