.reading-progress{position:fixed;top:72px;left:0;right:0;height:3px;background:transparent;z-index:90}
.reading-progress-bar{height:100%;width:0%;background:var(--signal);transition:width .1s linear}

.single-header{max-width:760px;margin:0 auto;padding-top:40px}
.single-header h1{font-size:clamp(2rem,4vw,2.8rem);margin:14px 0 20px;line-height:1.15}
.single-meta{font-family:var(--mono);font-size:.8rem;color:var(--slate);display:flex;gap:10px;flex-wrap:wrap}
.single-meta a{color:var(--slate);text-decoration:underline;text-underline-offset:2px}
.single-meta a:hover{color:var(--signal-deep)}

.single-featured-image{max-width:960px;margin:32px auto}
.single-featured-image img{width:100%;border-radius:var(--radius);aspect-ratio:16/10;object-fit:cover}

.single-body{max-width:760px;margin:0 auto;padding:32px 0 64px}

.author-bio{display:flex;gap:16px;align-items:flex-start;border-top:1px solid var(--mist);padding-top:32px;margin-top:48px}
.author-avatar{border-radius:50%;flex:0 0 auto}
.author-bio-label{display:block;font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--slate);margin-bottom:4px}
.author-bio-name{font-weight:600;color:var(--void)}
.author-bio p{font-size:.9rem;color:var(--slate);margin-top:6px}

.social-share{display:flex;align-items:center;gap:12px;margin:40px 0;padding:20px 0;border-top:1px solid var(--mist);border-bottom:1px solid var(--mist)}
.share-label{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--slate)}
.share-btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--mist);display:inline-flex;align-items:center;justify-content:center;gap:6px;color:var(--ink);transition:border-color var(--transition-fast),background var(--transition-fast)}
.share-btn:hover{border-color:var(--signal);background:var(--paper-2)}
#copyLinkBtn{width:auto;padding:0 14px;font-size:.8rem;font-weight:500}
#copyLinkBtn.is-copied{border-color:var(--signal-deep);color:var(--signal-deep)}

.research-meta{max-width:760px;margin:24px auto;display:grid;grid-template-columns:1fr 280px;gap:40px;padding:28px 0;border-top:1px solid var(--mist);border-bottom:1px solid var(--mist)}
.research-meta-abstract p{font-size:1rem;color:var(--ink);margin-top:8px}
.research-meta-side{display:flex;flex-direction:column;gap:16px}
.research-meta-side p{font-size:.9rem;color:var(--ink);margin-top:4px}
.research-meta-side .btn{align-self:flex-start}
@media(max-width:760px){
  .research-meta{grid-template-columns:1fr}
}

.resource-download{max-width:760px;margin:24px auto;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 28px;border:1px solid var(--mist);border-radius:var(--radius);background:var(--paper-2)}
.resource-download-info p{font-size:.9rem;color:var(--slate);margin-top:4px}

@media(max-width:640px){
  .single-header{padding-top:24px}
  .single-featured-image{margin:24px auto}
}