/* Shared styles for opaeron.com/blogs — the blog index and every article.
   The homepage keeps its own inlined CSS (it is the LCP-critical entry
   point); the blog pages share this file so it is cached across the set. */

@font-face { font-family:'Euclid Circular B'; src:url('/assets/fonts/Euclid-Circular-B-Light.woff2') format('woff2'); font-weight:300; font-display:swap; }
@font-face { font-family:'Euclid Circular B'; src:url('/assets/fonts/Euclid-Circular-B-Regular.woff2') format('woff2'); font-weight:400; font-display:swap; }
@font-face { font-family:'Euclid Circular B'; src:url('/assets/fonts/Euclid-Circular-B-Medium.woff2') format('woff2'); font-weight:500; font-display:swap; }
@font-face { font-family:'Euclid Circular B'; src:url('/assets/fonts/Euclid-Circular-B-SemiBold.woff2') format('woff2'); font-weight:600; font-display:swap; }
@font-face { font-family:'Euclid Circular B'; src:url('/assets/fonts/Euclid-Circular-B-Bold.woff2') format('woff2'); font-weight:700; font-display:swap; }

:root{
  --paper:#faf8f5; --card:#ffffff; --ink:#15181c; --ink-soft:#5b6168; --ink-faint:#8b9096;
  --blue:#1785bf; --teal:#4ca285; --blue-tint:#e9f4fa; --teal-tint:#e9f6f0;
  --cream:#f3eee6; --gold:#f0b849; --gold-tint:#fdf3df; --rose:#d1656a; --rose-tint:#fbeceb;
  --line:#eae6df; --maxw:1180px;
  --shadow-sm: 0 1px 2px rgba(21,24,28,0.04), 0 1px 1px rgba(21,24,28,0.03);
  --shadow-md: 0 12px 32px -12px rgba(21,24,28,0.14);
  --shadow-lg: 0 24px 60px -20px rgba(21,24,28,0.22);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:'Euclid Circular B','Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
h1,h2,h3,h4{ margin:0; text-wrap:balance; letter-spacing:-0.02em; }
p{ margin:0; text-wrap:pretty; }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }
ul,ol{ margin:0; padding:0; }
::selection{ background:var(--teal); color:#fff; }
:focus-visible{ outline:2px solid var(--blue); outline-offset:3px; border-radius:4px; }
.skip-link{ position:absolute; left:-9999px; top:0; background:var(--ink); color:#fff; padding:0.7rem 1.1rem; z-index:100; border-radius:0 0 0.6rem 0; font-size:0.9rem; font-weight:600; }
.skip-link:focus{ left:0; }
/* Visually hidden but read by screen readers — used for <table> captions,
   which describe the comparison tables without duplicating the heading
   already above them. */
.sr-only{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding-left:clamp(1.2rem,4vw,2.5rem); padding-right:clamp(1.2rem,4vw,2.5rem); }

/* nav */
.nav{ position:sticky; top:0; z-index:30; background:rgba(250,248,245,0.88); backdrop-filter:blur(12px); border-bottom:1px solid var(--line); }
.nav-inner{ display:flex; align-items:center; justify-content:space-between; gap:1rem; padding:0.95rem 0; }
.brand{ display:flex; align-items:center; gap:0.6rem; font-weight:700; font-size:1.05rem; letter-spacing:-0.02em; }
.brand img{ width:26px; height:26px; }
.nav-links{ display:flex; gap:1.9rem; font-size:0.92rem; font-weight:500; color:var(--ink-soft); }
.nav-links a:hover{ color:var(--ink); }
.nav-links a[aria-current="page"]{ color:var(--ink); font-weight:600; }
.nav-cta{ display:flex; align-items:center; gap:0.6rem; }
@media (max-width:900px){ .nav-links{ display:none; } .nav-cta .btn-ghost{ display:none; } }

.btn{ display:inline-flex; align-items:center; justify-content:center; gap:0.5rem; font-weight:600; font-size:0.9rem; padding:0.75rem 1.35rem; border-radius:999px; border:1px solid transparent; cursor:pointer; transition:transform .18s ease, box-shadow .18s ease, background-position .35s ease, border-color .18s ease, color .18s ease; }
.btn-primary{ background:linear-gradient(100deg, var(--blue) 0%, var(--teal) 60%, var(--gold) 130%); color:#fff; box-shadow:var(--shadow-md); background-size:160% 100%; background-position:0% 0%; }
.btn-primary:hover{ background-position:100% 0%; transform:translateY(-2px); box-shadow:var(--shadow-lg); }
.btn-ghost{ background:var(--card); border-color:var(--line); color:var(--ink); }
.btn-ghost:hover{ border-color:var(--teal); color:var(--teal); }
.btn-sm{ padding:0.6rem 1.05rem; font-size:0.85rem; }

.eyebrow{ display:inline-flex; align-items:center; gap:0.5rem; font-size:0.72rem; font-weight:700; letter-spacing:0.08em; text-transform:uppercase; color:var(--blue); background:var(--blue-tint); padding:0.45rem 0.9rem; border-radius:999px; }
.eyebrow.teal{ color:#2f7a61; background:var(--teal-tint); }
.eyebrow.gold{ color:#9a6a13; background:var(--gold-tint); }
.eyebrow.rose{ color:#a83f47; background:var(--rose-tint); }

/* breadcrumbs */
.crumbs{ font-size:0.8rem; color:var(--ink-faint); padding:1.6rem 0 0; }
.crumbs a:hover{ color:var(--ink); }
.crumbs span{ margin:0 0.4rem; opacity:0.6; }

/* ── blog index ─────────────────────────────────────── */
.blog-hero{ padding:2.2rem 0 2.6rem; max-width:720px; }
.blog-hero h1{ font-size:clamp(2rem,4.6vw,3rem); font-weight:700; line-height:1.1; margin-top:1.1rem; }
.blog-hero p{ margin-top:1rem; font-size:1.02rem; line-height:1.68; color:var(--ink-soft); }

.post-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1.1rem; padding-bottom:4rem; }
@media (max-width:900px){ .post-grid{ grid-template-columns:1fr; } }
.post{ display:flex; flex-direction:column; background:var(--card); border:1px solid var(--line); border-radius:1.2rem; overflow:hidden; transition:transform .2s ease, box-shadow .2s ease; }
.post:hover{ transform:translateY(-3px); box-shadow:var(--shadow-md); }
.post .thumb{ height:132px; display:grid; place-items:center; }
.post .thumb svg{ width:40px; height:40px; opacity:0.9; }
.post .body{ padding:1.3rem 1.4rem 1.5rem; flex:1; display:flex; flex-direction:column; }
.post .tag{ font-size:0.66rem; font-weight:700; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink-faint); }
.post h2{ font-size:1.06rem; font-weight:600; margin-top:0.45rem; line-height:1.35; }
.post p{ margin-top:0.5rem; font-size:0.86rem; line-height:1.6; color:var(--ink-soft); flex:1; }
.post .foot{ margin-top:1rem; display:flex; align-items:center; justify-content:space-between; gap:0.6rem; }
.post .rd{ font-size:0.82rem; font-weight:600; color:var(--blue); display:inline-flex; align-items:center; gap:0.35rem; }
.post .mins{ font-size:0.74rem; color:var(--ink-faint); }

/* ── article ────────────────────────────────────────── */
.article-head{ max-width:760px; padding:1.6rem 0 2.2rem; }
.article-head h1{ font-size:clamp(1.95rem,4.4vw,2.85rem); font-weight:700; line-height:1.14; margin-top:1.1rem; }
.article-head .standfirst{ margin-top:1.15rem; font-size:1.06rem; line-height:1.7; color:var(--ink-soft); }
.article-meta{ display:flex; align-items:center; gap:0.65rem; margin-top:1.5rem; padding-top:1.3rem; border-top:1px solid var(--line); font-size:0.84rem; color:var(--ink-faint); flex-wrap:wrap; }
.article-meta .who{ display:flex; align-items:center; gap:0.5rem; color:var(--ink); font-weight:600; }
.article-meta .who i{ width:26px; height:26px; border-radius:50%; background:linear-gradient(135deg,var(--blue),var(--teal)); display:grid; place-items:center; color:#fff; font-size:0.62rem; font-weight:700; font-style:normal; }
.article-meta .sep{ opacity:0.5; }

.article-layout{ display:grid; grid-template-columns:minmax(0,1fr) 244px; gap:3.2rem; align-items:start; padding-bottom:4rem; }
/* minmax(0,1fr): a bare 1fr is minmax(auto,1fr), which lets the
   comparison tables (min-width:560px) stretch the track and scroll the
   whole page sideways instead of scrolling inside .table-scroll. */
@media (max-width:960px){ .article-layout{ grid-template-columns:minmax(0,1fr); gap:0; } .toc{ display:none; } }

.toc{ position:sticky; top:92px; background:var(--card); border:1px solid var(--line); border-radius:1rem; padding:1.15rem 1.2rem; }
.toc h2{ font-size:0.7rem; font-weight:700; letter-spacing:0.08em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:0.75rem; }
.toc ol{ list-style:none; display:flex; flex-direction:column; gap:0.5rem; counter-reset:toc; }
.toc a{ font-size:0.83rem; color:var(--ink-soft); line-height:1.45; display:block; }
.toc a:hover{ color:var(--blue); }

/* article body typography */
.prose{ max-width:70ch; min-width:0; }
.prose > * + *{ margin-top:1.15rem; }
.prose p{ font-size:1.01rem; line-height:1.78; color:#2c3238; }
.prose h2{ font-size:clamp(1.35rem,2.6vw,1.72rem); font-weight:700; line-height:1.22; margin-top:2.9rem; scroll-margin-top:88px; }
.prose h3{ font-size:clamp(1.08rem,2vw,1.25rem); font-weight:600; line-height:1.3; margin-top:2rem; scroll-margin-top:88px; }
.prose h2 + p, .prose h3 + p{ margin-top:0.75rem; }
.prose strong{ font-weight:600; color:var(--ink); }
.prose a{ color:var(--blue); font-weight:500; border-bottom:1px solid rgba(23,133,191,0.3); }
.prose a:hover{ border-bottom-color:var(--blue); }
.prose ul, .prose ol{ padding-left:0; display:flex; flex-direction:column; gap:0.6rem; }
.prose ul li{ font-size:1.01rem; line-height:1.72; color:#2c3238; padding-left:1.5rem; position:relative; list-style:none; }
.prose ul li::before{ content:''; position:absolute; left:0.25rem; top:0.66rem; width:6px; height:6px; border-radius:50%; background:var(--teal); }
.prose ol{ counter-reset:li; }
.prose ol li{ font-size:1.01rem; line-height:1.72; color:#2c3238; padding-left:1.9rem; position:relative; list-style:none; counter-increment:li; }
.prose ol li::before{ content:counter(li); position:absolute; left:0; top:0.1rem; width:1.35rem; height:1.35rem; border-radius:50%; background:var(--blue-tint); color:var(--blue); font-size:0.72rem; font-weight:700; display:grid; place-items:center; }
.prose li > strong:first-child{ color:var(--ink); }
.prose code{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:0.87em; background:#f1efea; padding:0.12rem 0.36rem; border-radius:0.3rem; color:#3a4147; }
.prose blockquote{ border-left:3px solid var(--teal); padding:0.15rem 0 0.15rem 1.15rem; color:var(--ink-soft); font-size:1.02rem; line-height:1.7; }
.prose blockquote p{ color:inherit; }
.prose hr{ border:none; border-top:1px solid var(--line); margin:2.4rem 0; }
.prose figure{ margin:0; }
.prose figcaption{ font-size:0.8rem; color:var(--ink-faint); margin-top:0.55rem; line-height:1.5; }

/* callout */
.callout{ background:var(--blue-tint); border:1px solid #cfe6f4; border-radius:1rem; padding:1.15rem 1.3rem; }
.callout.teal{ background:var(--teal-tint); border-color:#cfe8dc; }
.callout.gold{ background:var(--gold-tint); border-color:#f5e2b8; }
.callout.rose{ background:var(--rose-tint); border-color:#f0d3d1; }
.callout h3{ font-size:0.94rem; font-weight:700; margin:0 0 0.4rem; }
.callout p{ font-size:0.92rem; line-height:1.65; color:var(--ink-soft); margin:0; }
.callout p + p{ margin-top:0.55rem; }

/* key-takeaway box, answer-first for AI citation */
.answer-box{ background:var(--card); border:1px solid var(--line); border-left:3px solid var(--teal); border-radius:0.9rem; padding:1.2rem 1.35rem; box-shadow:var(--shadow-sm); }
.answer-box h2{ font-size:0.72rem !important; font-weight:700; letter-spacing:0.08em; text-transform:uppercase; color:var(--ink-faint); margin:0 0 0.55rem !important; }
.answer-box p{ font-size:1.0rem; line-height:1.7; margin:0; }

/* table */
.table-scroll{ overflow-x:auto; -webkit-overflow-scrolling:touch; border:1px solid var(--line); border-radius:0.9rem; background:var(--card); }
table{ border-collapse:collapse; width:100%; min-width:560px; font-size:0.88rem; }
thead th{ text-align:left; font-size:0.68rem; font-weight:700; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink-faint); padding:0.8rem 0.95rem; border-bottom:1px solid var(--line); white-space:nowrap; background:#fcfbf9; }
tbody td{ padding:0.8rem 0.95rem; border-bottom:1px solid var(--line); color:var(--ink-soft); line-height:1.5; vertical-align:top; }
tbody tr:last-child td{ border-bottom:none; }
tbody td:first-child{ color:var(--ink); font-weight:600; white-space:nowrap; }
td .yes{ color:#2f7a61; font-weight:600; }
td .no{ color:var(--rose); font-weight:600; }

/* faq inside article */
.faq details{ border:1px solid var(--line); border-radius:0.9rem; background:var(--card); margin-bottom:0.6rem; overflow:hidden; }
.faq summary{ padding:1rem 1.2rem; font-size:0.94rem; font-weight:600; cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; gap:1rem; }
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{ content:'+'; font-size:1.15rem; color:var(--ink-faint); flex:none; line-height:1; }
.faq details[open] summary::after{ content:'−'; }
.faq details[open] summary{ border-bottom:1px solid var(--line); }
.faq .ans{ padding:1rem 1.2rem 1.15rem; font-size:0.92rem; line-height:1.72; color:var(--ink-soft); }
.faq .ans a{ color:var(--blue); font-weight:600; }

/* end-of-article product CTA */
.article-cta{ margin-top:3rem; background:linear-gradient(125deg,#0d2836 0%,#123f47 42%,#14503f 78%,#3c3620 130%); border-radius:1.4rem; padding:2rem 2.1rem; color:#fff; }
.article-cta h2{ font-size:1.3rem; font-weight:700; line-height:1.25; margin:0; }
.article-cta p{ margin-top:0.7rem; font-size:0.94rem; line-height:1.65; color:rgba(255,255,255,0.8); max-width:52ch; }
.article-cta .btn{ margin-top:1.3rem; background:#fff; color:var(--ink); }
.article-cta .btn:hover{ transform:translateY(-2px); }

/* prev/next */
.more-reading{ margin-top:3rem; padding-top:2rem; border-top:1px solid var(--line); }
.more-reading h2{ font-size:0.72rem; font-weight:700; letter-spacing:0.08em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:1rem; }
.more-grid{ display:grid; grid-template-columns:1fr 1fr; gap:0.9rem; }
@media (max-width:700px){ .more-grid{ grid-template-columns:1fr; } }
.more-card{ background:var(--card); border:1px solid var(--line); border-radius:1rem; padding:1.1rem 1.2rem; transition:transform .2s ease, box-shadow .2s ease; }
.more-card:hover{ transform:translateY(-2px); box-shadow:var(--shadow-md); }
.more-card .tag{ font-size:0.66rem; font-weight:700; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink-faint); }
.more-card h3{ font-size:0.95rem; font-weight:600; margin-top:0.35rem; line-height:1.4; }

/* footer */
footer{ border-top:1px solid var(--line); padding:2.6rem 0 2.4rem; }
.foot-grid{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:2rem; margin-bottom:2.2rem; }
@media (max-width:820px){ .foot-grid{ grid-template-columns:1fr 1fr; gap:1.6rem; } }
.foot-col h2{ font-size:0.74rem; font-weight:700; letter-spacing:0.07em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:0.75rem; }
.foot-col ul{ list-style:none; display:flex; flex-direction:column; gap:0.45rem; }
.foot-col a{ font-size:0.86rem; color:var(--ink-soft); }
.foot-col a:hover{ color:var(--ink); }
.foot-about{ font-size:0.86rem; color:var(--ink-soft); line-height:1.65; margin-top:0.7rem; max-width:34ch; }
.foot-bottom{ border-top:1px solid var(--line); padding-top:1.5rem; display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:0.8rem; }
.foot-bottom .fine{ font-size:0.8rem; color:var(--ink-faint); }
.foot-bottom .fine a{ color:var(--blue); font-weight:600; }
.built-by{ font-size:0.8rem; color:var(--ink-faint); }
.built-by a{ color:var(--ink); font-weight:600; border-bottom:1.5px solid var(--teal); padding-bottom:1px; }
.built-by a:hover{ color:var(--teal); }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; transition:none !important; }
}