/* ---------- Research: journal / publications index, no imagery ---------- */
/* Light masthead in place of an image hero; nav starts in its solid state */
body:not(.menu-open):has(.hero-plain) .nav{background:rgba(242,243,244,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:var(--ink);border-bottom-color:var(--line)}
body:not(.menu-open):has(.hero-plain) .nav .btn{background:var(--ink);color:var(--paper)}
body:not(.menu-open):has(.hero-plain) .nav .btn:hover{background:var(--copper)}
.hero-plain{min-height:0;display:block;background:var(--paper);color:var(--ink);overflow:visible}
.hero-plain::after{display:none}
.hero-plain .wrap{padding-block:150px clamp(48px,6vw,80px)}
.masthead-rule{height:1px;background:var(--ink)}
.masthead-rule.double{height:4px;background:none;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);margin-top:clamp(48px,6vw,80px)}
.masthead-meta{display:flex;flex-wrap:wrap;gap:8px 0;padding:14px 0 clamp(48px,6vw,88px);font-size:12px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:var(--steel)}
.masthead-meta span+span::before{content:"/";margin:0 14px;color:var(--line)}
.hero-plain h1{font-size:clamp(42px,6.4vw,108px);max-width:none;color:var(--ink)}
.masthead-abstract{margin-top:clamp(40px,5vw,72px)}
.abs-label,.abs{font-size:12px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:var(--copper)}
.masthead-abstract p:last-child{font-size:clamp(20px,1.8vw,26px);font-weight:300;letter-spacing:-.015em;line-height:1.4;max-width:52ch}
@media (max-width:760px){.masthead-abstract{grid-template-columns:1fr}}

/* Sections */
.res-sec{padding-block:clamp(56px,7vw,104px) 0}
#papers{padding-bottom:clamp(96px,12vw,170px)}
.sec-label{display:flex;gap:18px;align-items:baseline;font-size:12px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);padding-bottom:16px;border-bottom:1px solid var(--ink);margin-bottom:0}
.sec-label span:first-child{color:var(--copper);font-variant-numeric:tabular-nums}
.sec-label.light{color:var(--mist);border-bottom-color:var(--paper);margin-bottom:clamp(32px,4vw,56px)}
.ref{font-size:13px;font-weight:500;letter-spacing:.08em;font-variant-numeric:tabular-nums;color:var(--steel)}
.meta{margin:0;display:grid;gap:10px}
.meta div{display:grid;grid-template-columns:64px 1fr;gap:12px;font-size:13px}
.meta dt{color:var(--steel);letter-spacing:.06em;text-transform:uppercase;font-size:11px;padding-top:2px}
.meta dd{margin:0;color:var(--ink)}
.abs{display:block;margin-bottom:10px}

/* Featured paper */
.lead-entry{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:24px clamp(24px,4vw,64px);padding:clamp(32px,4vw,56px) 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.lead-side{display:flex;flex-direction:column;gap:22px}
.lead-main{display:flex;flex-direction:column;gap:26px}
.lead-main h2{font-size:clamp(44px,5.6vw,92px);font-weight:300;letter-spacing:-.04em;line-height:.98;transition:color .4s var(--ease)}
.lead-main p{font-size:clamp(18px,1.5vw,22px);font-weight:300;line-height:1.45;color:var(--steel);max-width:58ch}
.lead-main .btn{align-self:flex-start}
.lead-entry:hover .btn{background:var(--copper)}
@media (max-width:760px){.lead-entry{grid-template-columns:1fr}}

/* White papers: table-of-contents entries */
.entries{list-style:none;margin:0;padding:0}
.entries li{border-bottom:1px solid var(--line)}
.entry{position:relative;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,6.2fr) minmax(0,2.4fr) 140px;gap:16px clamp(20px,3vw,48px);align-items:start;padding:34px 12px 34px 24px;text-decoration:none;color:var(--ink);transition:background .45s var(--ease)}
.entry::before{content:"";position:absolute;left:0;top:34px;bottom:34px;width:2px;background:var(--copper);transform:scaleY(0);transform-origin:50% 0;transition:transform .5s var(--ease)}
.entry .ref{padding-top:8px}
.entry h3{font-size:clamp(24px,2.3vw,34px);font-weight:300;letter-spacing:-.028em;line-height:1.1;text-wrap:balance;margin-bottom:14px}
.entry p{font-size:16px;color:var(--steel);max-width:58ch}
.entry .meta{padding-top:8px}
.entry-cta{font-size:14px;font-weight:500;white-space:nowrap;padding-top:8px;padding-bottom:4px;border-bottom:1px solid currentColor;align-self:start;transition:color .3s}
.entry:hover{background:rgba(13,16,19,.035)}
.entry:hover::before{transform:scaleY(1)}
.entry:hover .entry-cta,.entry:hover .ref{color:var(--copper)}
@media (max-width:960px){.entry{grid-template-columns:72px minmax(0,1fr)}.entry .meta,.entry-cta{grid-column:2}.entry-cta{justify-self:start}}
@media (max-width:560px){.entry{grid-template-columns:1fr;padding-left:18px}.entry .meta,.entry-cta{grid-column:1}}

/* Access note */
.access-note .h2{max-width:none}

/* no eyebrows: give the headline its own space below the top rule */
.hero-plain h1{margin-top:clamp(48px,6vw,88px)}