/* Research channel — builds on site.css variables. Serif body for editorial feel. */
.kicker{display:inline-flex;align-items:center;gap:8px;color:#0369a1;font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.1em}
.kicker:before{content:"";width:24px;height:2px;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--green))}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;color:#94a3b8;font-size:12.5px;font-weight:650;margin-bottom:20px}
.crumbs a{color:#64748b}
.who{display:flex;align-items:center;gap:11px}
.who b{display:block;color:#10263c;font-size:13.5px}
.who small{display:block;margin-top:2px;color:#64748b;font-size:12px}
.avatar{width:42px;height:42px;flex:0 0 auto;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#dff7ff,#dcfce7);border:1px solid #bae6fd;color:#0369a1;font-size:12px;font-weight:950}
.avatar.lg{width:64px;height:64px;font-size:16px}
.tag{display:inline-flex;padding:6px 9px;border-radius:999px;background:#f0f9ff;color:#0369a1;border:1px solid #bae6fd;font-size:11px;font-weight:850}

/* ---- channel index ---- */
.res-hero{padding:56px 0 34px;background:radial-gradient(circle at 8% 8%,rgba(56,189,248,.18),transparent 24rem),linear-gradient(180deg,#f8fdff,#fff)}
.res-hero h1{margin:16px 0 16px;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(38px,5.4vw,62px);font-weight:700;line-height:1.02;letter-spacing:-.045em;max-width:880px}
.res-hero .lead{margin:0;max-width:730px;color:#536477;font-size:17px;line-height:1.72}
.res-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.res-stats span{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;font-weight:720;color:#475569}
.res-main{padding:34px 0 20px}
.feature{display:grid;grid-template-columns:.85fr 1.15fr;overflow:hidden;border:1px solid #dbeafe;border-radius:30px;background:#fff;box-shadow:0 24px 60px rgba(14,165,233,.12);margin-bottom:34px}
.feature-art{position:relative;display:flex;flex-direction:column;justify-content:space-between;min-height:250px;padding:30px;background:radial-gradient(circle at 20% 15%,rgba(56,189,248,.30),transparent 17rem),radial-gradient(circle at 88% 20%,rgba(52,211,153,.26),transparent 16rem),linear-gradient(145deg,#effaff,#ecfdf5)}
.feature-art span{align-self:flex-start;padding:7px 11px;border:1px solid rgba(255,255,255,.85);border-radius:999px;background:rgba(255,255,255,.72);color:#0369a1;font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.08em}
.feature-art strong{color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(24px,2.8vw,34px);font-weight:700;line-height:1.2;letter-spacing:-.02em}
.feature-copy{display:flex;flex-direction:column;justify-content:center;padding:38px}
.feature-copy h2{margin:14px 0 12px;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(26px,3.2vw,38px);line-height:1.1;letter-spacing:-.035em}
.feature-copy p{margin:0;color:#64748b;font-size:15.5px;line-height:1.7}
.meta{display:flex;flex-wrap:wrap;gap:9px 14px;align-items:center;color:#64748b;font-size:12.5px;font-weight:650}
.cards{display:grid;gap:0}
.card{display:grid;grid-template-columns:170px 1fr;gap:26px;padding:28px 0;border-bottom:1px solid var(--line)}
.card:first-child{border-top:1px solid var(--line)}
.card-date{color:#64748b;font-size:12px;line-height:1.6}
.card-date b{display:block;margin-top:8px;color:#10263c;font-size:13px}
.card-copy h2{margin:10px 0 10px;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:28px;line-height:1.15;letter-spacing:-.03em}
.card-copy h2 a{color:inherit}
.card-copy h2 a:hover{color:#0f729e}
.card-copy p{margin:0;color:#64748b;font-size:14.5px;line-height:1.68}
.who.sm{margin-top:15px}.who.sm .avatar{width:32px;height:32px;font-size:10px}
.pager{display:flex;justify-content:space-between;gap:14px;margin:34px 0 10px}
.pager a{padding:11px 18px;border:1px solid var(--line);border-radius:999px;color:#475569;font-size:13.5px;font-weight:750;background:#fff}
.pager a:hover{border-color:#bae6fd;color:#0369a1}
.pagenote{margin:0 0 18px;color:#94a3b8;font-size:13px;font-weight:650}
.res-about{padding:60px 0;background:linear-gradient(180deg,#f8fafc,#fff);border-top:1px solid #edf2f7;margin-top:40px}
.about-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:start}
.res-about h2{margin:13px 0 0;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(28px,3.6vw,44px);line-height:1.1;letter-spacing:-.04em}
.about-copy>p{margin:18px 0 0;color:#64748b;font-size:14.5px;line-height:1.75;max-width:720px}
.method{margin:22px 0 0;padding:0;list-style:none;max-width:760px}
.method li{padding:14px 0;border-top:1px solid var(--line);color:#64748b;font-size:14px;line-height:1.65}
.method li b{display:block;margin-bottom:3px;color:#10263c;font-size:14.5px}

/* ---- article ---- */
.art-hero{padding:52px 0 36px;background:radial-gradient(circle at 8% 5%,rgba(56,189,248,.15),transparent 23rem),linear-gradient(180deg,#f9fdff,#fff)}
.art-head{max-width:940px;margin:0 auto}
.art-head h1{margin:16px 0 18px;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(36px,5.4vw,64px);font-weight:700;line-height:1.03;letter-spacing:-.045em}
.dek{margin:0;max-width:860px;color:#536477;font-size:19px;line-height:1.62}
.byline{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;align-items:center;margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
.when{text-align:right;color:#64748b;font-size:12.5px;line-height:1.55}
.art-visual{position:relative;display:flex;align-items:center;gap:30px;margin-top:6px;padding:34px 40px;overflow:hidden;border:1px solid #dbeafe;border-radius:30px;background:radial-gradient(circle at 84% 15%,rgba(52,211,153,.18),transparent 18rem),linear-gradient(145deg,#effaff,#fff 60%,#ecfdf5);max-width:1100px}
.art-visual .big-number{flex:0 0 auto;color:#0f729e;font-family:Georgia,"Times New Roman",serif;font-size:clamp(52px,7vw,92px);font-weight:700;line-height:1;letter-spacing:-.04em;opacity:.9}
.visual-copy span{color:#0369a1;font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.09em}
.visual-copy blockquote{margin:10px 0 0;color:#10263c;font-family:Georgia,"Times New Roman",serif;font-size:clamp(18px,2.1vw,25px);line-height:1.42}
.art-shell{display:grid;grid-template-columns:200px minmax(0,720px) 250px;justify-content:center;gap:36px;padding:46px 0 80px}
.art-toc{position:sticky;top:100px;align-self:start}
.art-toc strong{display:block;margin-bottom:12px;color:#10263c;font-size:11px;text-transform:uppercase;letter-spacing:.09em}
.art-toc a{display:block;padding:7px 0;color:#64748b;font-size:12.5px;line-height:1.4}
.art-toc a.active{color:#0369a1;font-weight:800}
.art-body{min-width:0;color:#334155;font-family:Georgia,"Times New Roman",serif;font-size:18px;line-height:1.85}
.art-body p{margin:0 0 24px}
.art-body h2{scroll-margin-top:100px;margin:48px 0 16px;color:#10263c;font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:29px;line-height:1.16;letter-spacing:-.035em}
.art-body h3{margin:34px 0 12px;color:#10263c;font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:20px;letter-spacing:-.02em}
.art-body ul{margin:0 0 24px;padding-left:22px}
.art-body li{margin:9px 0}
.art-body a{color:#0369a1;text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px;text-decoration-color:#bae6fd}
.art-body a:hover{text-decoration-color:#0369a1}
.art-body blockquote{margin:34px 0;padding:20px 26px;border-left:3px solid #38bdf8;border-radius:0 16px 16px 0;background:linear-gradient(90deg,#f0faff,transparent);color:#0f4f72;font-size:22px;line-height:1.45}
.art-body .tblwrap{margin:28px 0;overflow-x:auto}
.art-body table{width:100%;border-collapse:collapse;font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:14px}
.art-body th,.art-body td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);line-height:1.45}
.art-body thead th{color:#10263c;font-weight:800;border-bottom:2px solid #cbd5e1;vertical-align:bottom;white-space:nowrap}
.art-body tbody td{color:#475569}
.art-body tbody td:first-child{color:#10263c;font-weight:650}
.art-body caption{caption-side:bottom;padding:12px 2px 0;color:#94a3b8;font-size:12.5px;line-height:1.55;text-align:left}
.art-end{margin-top:50px;padding-top:28px;border-top:1px solid var(--line);font-family:Inter,ui-sans-serif,system-ui,sans-serif}
.author-box{display:grid;grid-template-columns:auto 1fr;gap:18px;padding:24px;border:1px solid #dbeafe;border-radius:24px;background:linear-gradient(145deg,#f7fdff,#fff)}
.author-box h3{margin:0 0 8px;font-family:Georgia,serif;font-size:22px;color:#10263c}
.author-box p{margin:0;color:#64748b;font-size:13.5px;line-height:1.65}
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px;font-family:Inter,ui-sans-serif,system-ui,sans-serif}
.prevnext .pn{padding:16px 18px;border:1px solid var(--line);border-radius:18px;background:#fff}
.prevnext .pn:hover{border-color:#bae6fd}
.prevnext .pn span{display:block;color:#94a3b8;font-size:11px;font-weight:850;text-transform:uppercase;letter-spacing:.07em;margin-bottom:5px}
.prevnext .pn b{color:#10263c;font-size:14px;line-height:1.35}
.art-side{position:sticky;top:100px;align-self:start;display:grid;gap:16px;font-family:Inter,ui-sans-serif,system-ui,sans-serif}
.side-card{padding:20px;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:0 12px 30px rgba(15,23,42,.05)}
.side-card h3{margin:13px 0 9px;color:#10263c;font-family:Georgia,serif;font-size:19px}
.side-card p{margin:0;color:#64748b;font-size:12.8px;line-height:1.62}
.side-card.cta{background:radial-gradient(circle at 0% 0%,rgba(56,189,248,.16),transparent 16rem),linear-gradient(145deg,#f7fdff,#fff);border-color:#dbeafe}
.side-card.cta h3{margin-top:0}
.side-card.cta .btn{margin-top:14px;width:100%}
.to-top{position:fixed;right:22px;bottom:22px;z-index:40;padding:11px 15px;border:0;border-radius:999px;background:linear-gradient(135deg,var(--blue),var(--green));color:#fff;font-size:13px;font-weight:800;cursor:pointer;box-shadow:0 12px 30px rgba(14,165,233,.32);opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .2s,transform .2s}
.to-top.show{opacity:1;transform:translateY(0);pointer-events:auto}

@media(max-width:1080px){
  .art-shell{grid-template-columns:minmax(0,760px);padding-left:20px;padding-right:20px}
  .art-toc{position:static;display:flex;flex-wrap:wrap;gap:8px 16px;padding-bottom:16px;border-bottom:1px solid var(--line)}
  .art-toc strong{width:100%}
  .art-side{position:static;grid-template-columns:1fr 1fr}
  .feature,.about-grid{grid-template-columns:1fr}
}
@media(max-width:720px){
  .res-hero h1{font-size:36px}.art-head h1{font-size:34px}.dek{font-size:17px}
  .card{grid-template-columns:1fr;gap:6px}.card-date{display:flex;gap:12px;align-items:center}.card-date b{margin:0}
  .card-copy h2{font-size:24px}
  .art-visual{flex-direction:column;align-items:flex-start;gap:12px;padding:26px}
  .art-side{grid-template-columns:1fr}
  .prevnext{grid-template-columns:1fr}
  .art-body{font-size:17px}.art-body h2{font-size:25px}
}