:root{
  --navy:#10293f; --teal:#0e7c7b; --ink:#23303b; --muted:#5b6b78;
  --line:#e3e9ee; --bg:#ffffff; --bg-soft:#f6f9fa;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.68;font-size:16.5px}
h1,h2,h3{font-family:"Fraunces",Georgia,serif;color:var(--navy);font-weight:600}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:800px;margin:0 auto;padding:0 22px}
.topbar{background:rgba(255,255,255,.93);backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50}
.topbar .wrap{display:flex;align-items:center;gap:14px;padding:13px 22px}
.topbar .back{font-weight:600;font-size:14.5px;color:var(--navy)}
.topbar .back:hover{color:var(--teal);text-decoration:none}
.topbar .who{margin-left:auto;font-family:"Fraunces",Georgia,serif;
  font-size:14.5px;color:var(--muted)}
header.paper{background:var(--bg-soft);border-bottom:1px solid var(--line);
  padding:46px 0 34px}
.kicker{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--teal);margin-bottom:12px}
header.paper h1{font-size:31px;line-height:1.28;margin-bottom:14px}
.authors{font-size:15.5px;color:var(--muted);margin-bottom:14px}
.authors strong{color:var(--ink)}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.badge{font-size:12.5px;font-weight:600;border-radius:5px;padding:3px 11px}
.badge-journal{background:#eef4f8;color:var(--navy)}
.badge-year{background:#fff;color:var(--muted);border:1px solid var(--line)}
.badge-oa{background:#e7f6ef;color:#1a7a4a}
.pub-links{display:flex;flex-wrap:wrap;gap:9px}
.pub-links a{font-size:13.5px;font-weight:600;border:1.5px solid var(--line);
  border-radius:6px;padding:6px 14px;color:var(--navy);background:#fff}
.pub-links a:hover{border-color:var(--teal);color:var(--teal);text-decoration:none}
.pub-links a.primary{background:var(--navy);color:#fff;border-color:var(--navy)}
.pub-links a.primary:hover{background:var(--teal);border-color:var(--teal);color:#fff}
main{padding:8px 0 20px}
section.blk{padding:34px 0 4px}
section.blk h2{font-size:22px;padding-bottom:9px;border-bottom:2px solid var(--line);
  margin-bottom:18px}
.abstract{background:var(--bg-soft);border:1px solid var(--line);border-left:4px solid var(--teal);
  border-radius:9px;padding:20px 22px;font-size:15.5px}
.keypoints{list-style:none}
.keypoints li{position:relative;padding-left:26px;margin-bottom:12px;font-size:15.5px}
.keypoints li::before{content:"\25B8";color:var(--teal);position:absolute;left:6px}
.callout{background:#f2fbf9;border:1px solid #d3ece8;border-radius:9px;
  padding:16px 18px;font-size:15px;color:var(--ink)}
.cite{background:#fff;border:1px solid var(--line);border-radius:8px;padding:15px 17px;
  font-size:14.5px;color:var(--muted)}
.pdfframe{width:100%;height:820px;border:1px solid var(--line);border-radius:9px;margin-top:6px}
.note{font-size:14px;color:var(--muted);margin-top:10px}
footer{margin-top:50px;border-top:1px solid var(--line);padding:24px 0 40px;
  color:var(--muted);font-size:14px;text-align:center}
@media (max-width:560px){header.paper h1{font-size:25px}.pdfframe{height:560px}}

/* ===== dark mode (matches index.html palette) ===== */
:root{color-scheme:light;}
html[data-theme="dark"]{
  --navy:#8fd3ff;--teal:#4fd6c9;--ink:#dbe6ee;--muted:#93a6b3;
  --line:#22333f;--bg:#0b1720;--bg-soft:#111f2b;color-scheme:dark;
}
html[data-theme="dark"] .topbar{background:rgba(11,23,32,.92);}
html[data-theme="dark"] .badge-journal{background:#16283a;color:#8fd3ff;}
html[data-theme="dark"] .badge-year{background:var(--bg-soft);}
html[data-theme="dark"] .badge-oa{background:#12301f;color:#5fd39a;}
html[data-theme="dark"] .pub-links a{background:var(--bg-soft);}
html[data-theme="dark"] .pub-links a.primary,html[data-theme="dark"] .pub-links a.primary:hover{color:#0b1720;}
html[data-theme="dark"] .callout{background:#10241f;border-color:#1d4038;color:var(--ink);}
html[data-theme="dark"] .cite{background:var(--bg-soft);}
body{transition:background .25s ease,color .25s ease;}