/* The research page: a full-screen sheet with its own bar (Back, language,
   theme). Loaded with the site; the reader inside loads when a paper opens. */
.research-page{position:fixed;inset:0;z-index:150;overflow-y:auto;overscroll-behavior:contain;background:var(--bg);color:var(--text);scrollbar-gutter:stable;-webkit-overflow-scrolling:touch;}
.research-toolbar{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--border);}
.research-toolbar-inner{max-width:1192px;margin:auto;min-height:68px;padding:10px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px;}
.research-back{display:inline-flex;align-items:center;gap:10px;min-height:44px;color:var(--text);font-size:14px;font-weight:650;text-decoration:none;}
.research-controls{display:flex;align-items:center;gap:4px;flex-shrink:0;}
.research-controls button{min-width:44px;min-height:44px;border:0;border-radius:8px;background:transparent;color:var(--text2);font:inherit;font-size:12px;font-weight:700;cursor:pointer;}
.research-controls button[aria-current=true]{background:var(--surface2);color:var(--text);}
.research-controls button:hover{color:var(--accent);}
.research-controls .theme-btn{display:inline-flex;align-items:center;justify-content:center;}
.research-controls .theme-btn svg{width:18px;height:18px;}
.research-page :is(a,button,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:4px;}
@media(max-width:840px){.research-toolbar-inner{padding:10px 20px;}}
@media(max-width:500px){.research-toolbar-inner{min-height:64px;padding:8px 16px;gap:8px;}.research-back{font-size:12px;gap:7px;max-width:185px;line-height:1.35;}.research-back svg{flex-shrink:0;}.research-controls{gap:0;}}
.research-loading{max-width:1192px;margin:auto;padding:58px 28px;color:var(--text2);font-size:14px;}
.research-loading button{min-height:44px;margin-left:6px;padding:0 4px;border:0;background:none;color:var(--accent);font:inherit;font-weight:650;text-decoration:underline;text-underline-offset:4px;cursor:pointer;}