.seo-nav,.seo-footer{max-width:1120px;margin:auto;padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap}
.seo-nav nav a.button.primary:hover{color:#fff}
.seo-nav{border-bottom:1px solid var(--line)}
.seo-nav nav{display:flex;gap:22px;align-items:center;flex-wrap:wrap;font-size:16px;font-weight:600}
.seo-nav a:focus-visible,.seo-main a:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
.seo-main{max-width:880px;margin:58px auto 72px;padding:0 24px;overflow-wrap:anywhere}
.seo-main h1{font-size:clamp(32px,5vw,48px);line-height:1.2;letter-spacing:-.035em;margin:14px 0 24px}
.seo-main h2{font-size:24px;line-height:1.4;margin:0 0 12px;letter-spacing:-.02em}
.seo-main p,.seo-main li{font-size:18px;line-height:1.8;color:var(--ink)}
.seo-main .seo-intro{font-size:20px;line-height:1.75;color:var(--muted);margin-bottom:36px}
.seo-main section{margin:34px 0}
.seo-main p a,.seo-related a{color:var(--blue);text-decoration:underline;text-underline-offset:4px}
.seo-guide-grid{display:grid;gap:18px;margin-top:36px}
.seo-guide-card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px;transition:border-color .15s}
.seo-guide-card:hover{border-color:var(--blue)}
.seo-guide-card p{margin:10px 0 18px;font-size:17px;color:var(--muted)}
.seo-guide-card>span{color:var(--blue);font-weight:700}
.seo-breadcrumb{display:flex;gap:12px;margin-bottom:28px;font-size:15px;color:var(--muted)}
.seo-callout{padding:26px;background:var(--soft);border:1px solid var(--line);border-radius:16px;margin:36px 0}
.seo-related{border-top:1px solid var(--line);padding-top:26px;margin-top:40px}
.seo-related li{margin:10px 0}
.seo-footer{border-top:1px solid var(--line);font-size:15px;color:var(--muted)}
.seo-home-guides{padding-top:50px;padding-bottom:50px}
.seo-home-guides .section-heading{margin-bottom:22px}
.seo-home-guide-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.seo-home-guide-links a{display:block;padding:23px;background:var(--panel);border:1px solid var(--line);border-radius:14px;font-size:19px;font-weight:650;line-height:1.5}
.seo-home-guide-links span{display:block;margin-top:12px;color:var(--blue);font-size:15px;font-weight:600}
@media(max-width:700px){.seo-nav{padding:18px 20px}.seo-nav nav{gap:16px}.seo-main{margin-top:34px;padding:0 20px}.seo-main p,.seo-main li{font-size:17px}.seo-main .seo-intro{font-size:18px}.seo-main h2{font-size:23px}.seo-guide-card,.seo-callout{padding:22px}.seo-home-guide-links{grid-template-columns:1fr}}

/* R16: readable, server-rendered research documentation. No app layout overrides. */
.research-skip{position:fixed;top:12px;left:12px;z-index:1000;transform:translateY(-180%);padding:12px 18px;background:var(--panel);color:var(--ink);border:2px solid var(--blue);border-radius:8px}
.research-skip:focus{transform:none}
.research-doc{max-width:960px}
.research-doc section[id]{scroll-margin-top:28px}
.research-doc h1{max-width:820px}
.research-doc h2{font-weight:600}
.research-doc .research-byline{display:flex;gap:8px 18px;flex-wrap:wrap;font-size:14px;line-height:1.7;color:var(--muted);padding-bottom:22px;margin-bottom:22px;border-bottom:1px solid var(--line)}
.research-byline a,.research-toc a{color:var(--blue);text-underline-offset:4px}
.research-toc{display:flex;flex-wrap:wrap;gap:10px 20px;font-size:15px;line-height:1.6;padding:18px 0;margin:0 0 30px;border-bottom:1px solid var(--line)}
.research-toc strong{width:100%;color:var(--ink);font-weight:600}
.research-doc .research-step{display:block;font-size:13px;line-height:1.6;letter-spacing:.04em;margin-bottom:12px;color:var(--muted);font-weight:600}
.research-table-wrap{margin:24px 0;max-width:100%}
.research-table-wrap table{width:100%;border-collapse:collapse;table-layout:fixed}
.research-table-wrap caption{text-align:left;font-weight:600;color:var(--ink);padding:0 0 14px;font-size:16px;line-height:1.6}
.research-table-wrap th,.research-table-wrap td{padding:15px 16px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);font-size:16px;line-height:1.7;overflow-wrap:anywhere;color:var(--ink)}
.research-table-wrap thead th{background:var(--soft);font-size:14px;font-weight:650}
.research-table-wrap tbody th{font-weight:600;width:24%}
.research-table-wrap a{color:var(--blue);text-decoration:underline;text-underline-offset:4px}
.research-path{padding-left:24px}
.research-path li{padding:8px 0 8px 6px}
.research-path li span{display:block;color:var(--muted)}
.research-home-method{display:grid;grid-template-columns:1fr 1.3fr;gap:50px;padding-top:55px;padding-bottom:50px;border-bottom:1px solid var(--line)}
.research-home-method h2{font-size:clamp(27px,3vw,38px);letter-spacing:-.03em;line-height:1.25;margin:14px 0}
.research-home-method p{font-size:17px;line-height:1.8;color:var(--muted);margin:0 0 18px}
@media(max-width:700px){.research-doc .research-byline{gap:6px 12px}.research-table-wrap th,.research-table-wrap td{font-size:14px;line-height:1.6;padding:12px 8px}.research-table-wrap caption{font-size:15px}.research-home-method{grid-template-columns:1fr;gap:18px;padding-top:35px;padding-bottom:35px}.research-doc .research-toc{gap:12px}.research-doc .seo-breadcrumb{flex-wrap:wrap}.research-doc .seo-callout .button{max-width:100%;white-space:normal;text-align:center}}

/* Small-window header reflow; preserve brand and navigation controls. */
@media(max-width:1040px){.site-header .header-inner{gap:18px}.site-header #main-navigation{display:none}.site-header .menu-toggle{display:block;margin-left:auto}.site-header #main-navigation.open{display:flex;position:absolute;left:20px;right:20px;top:76px;flex-direction:column;gap:16px;padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:10px;z-index:21}}
@media(max-width:380px){.site-header .header-inner{height:auto;min-height:76px;gap:10px;flex-wrap:wrap;padding-block:12px}.site-header .logo{font-size:18px}.site-header .menu-toggle{margin-left:auto}.site-header .header-actions{margin-left:auto;gap:8px}.site-header .header-actions .button{padding-inline:13px}.site-header #main-navigation.open{top:122px}}


/* R17 worksheet is confined to public research documentation. */
.seo-nav nav{position:static;inset:auto;flex-direction:row;flex-wrap:wrap;padding:0;border:0;background:transparent}
.research-doc .research-toc,.research-doc .seo-breadcrumb{position:static;inset:auto;background:transparent}
.research-doc .seo-breadcrumb{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px;padding:0;border:0;min-height:0;width:auto}
.research-worksheet{border-top:1px solid var(--line);padding-top:28px}
.research-worksheet fieldset{border:0;padding:0;margin:24px 0 32px;min-width:0}.research-worksheet legend{font-size:20px;font-weight:600;line-height:1.5;padding:0 0 12px}
.research-worksheet label{display:block;font-size:15px;line-height:1.65;font-weight:600;margin:14px 0 7px}.research-worksheet label span{font-weight:400;color:var(--muted)}
.research-worksheet input,.research-worksheet textarea{display:block;width:100%;min-width:0;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:8px;font:inherit;font-size:16px;line-height:1.65;padding:12px 14px;box-sizing:border-box}
.research-worksheet input{min-height:48px}.research-worksheet textarea{resize:vertical}.research-worksheet :is(input,textarea):focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.research-note-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px}.research-note-pair>div{min-width:0}.research-note-actions{display:flex;gap:12px;flex-wrap:wrap}.research-note-actions button{min-height:44px;white-space:normal}.research-worksheet .research-note-status{font-size:14px;line-height:1.7;color:var(--muted);margin-top:16px}
@media(max-width:650px){.research-note-pair{grid-template-columns:1fr;gap:0}.research-note-actions{flex-direction:column;align-items:stretch}}