/* NOVA blog — premium "inverse-HUD" styling for the static SEO article pages.
   Light, airy, white/blue with arc-cyan glow accents to match the main site
   (Leptos app uses the same nova/arc palette). Self-contained: no Tailwind,
   no WASM, no webfonts (CSP-safe; falls back to the system Inter/Segoe stack). */

:root {
  --nova-50:#eff6ff; --nova-100:#dbeafe; --nova-200:#bfdbfe;
  --nova-500:#3b82f6; --nova-600:#2563eb; --nova-700:#1d4ed8; --nova-900:#1e3a8a;
  --arc:#22d3ee; --arc-600:#0891b2;
  --ink:#0b1220;       /* near-black headings */
  --body:#334155;      /* slate-700 body */
  --muted:#64748b;     /* slate-500 */
  --line:#e6ebf3;      /* hairlines */
  --tint:#f5f8ff;      /* faint blue surface */
  --surface:#f8fafc;
  --grad-blue:linear-gradient(135deg,#2563eb 0%,#1d4ed8 100%);
  --grad-accent:linear-gradient(90deg,#2563eb 0%,#22d3ee 100%);
  --shadow-card:0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.05);
  --shadow-glow:0 18px 48px rgba(37,99,235,.18);
  --maxw:700px;
}

* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
::selection { background:var(--nova-200); color:var(--ink); }

body {
  margin:0;
  font-family:Inter,system-ui,"Segoe UI",Roboto,sans-serif;
  color:var(--body); background:#fff; line-height:1.72; font-size:18px;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
a { color:var(--nova-700); text-decoration:none; }
a:hover { text-decoration:underline; }
img { max-width:100%; }

/* reading progress bar (filled by tiny inline script in the template) */
.progress { position:fixed; top:0; left:0; height:3px; width:0;
  background:var(--grad-accent); z-index:60; transition:width .08s linear; }

/* ---------- header / nav ---------- */
.site-header {
  position:sticky; top:0; z-index:40;
  background:rgba(255,255,255,.8); backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav { max-width:1120px; margin:0 auto; padding:14px 24px;
  display:flex; align-items:center; justify-content:space-between; gap:16px; }
.brand { display:flex; align-items:center; gap:9px; }
.brand img { height:28px; width:28px; filter:drop-shadow(0 0 8px rgba(34,211,238,.35)); }
.brand span { font-weight:800; font-size:18px; letter-spacing:-.02em; color:var(--ink); }
.nav-links { display:flex; align-items:center; gap:26px; }
.nav-links a { color:var(--body); font-weight:500; font-size:15px; }
.nav-links a:hover { color:var(--nova-700); text-decoration:none; }
.nav-cta { background:var(--grad-blue); color:#fff !important; padding:9px 18px;
  border-radius:11px; font-weight:600; box-shadow:0 6px 16px rgba(37,99,235,.28); }
.nav-cta:hover { text-decoration:none; filter:brightness(1.05); }
@media (max-width:680px){ .nav-links a:not(.nav-cta){ display:none; } }

/* ---------- layout ---------- */
.wrap { max-width:var(--maxw); margin:0 auto; padding:0 24px; }
.wrap-wide { max-width:1120px; margin:0 auto; padding:0 24px; }

.eyebrow { display:inline-flex; align-items:center; gap:8px;
  font-size:12px; font-weight:700; letter-spacing:.12em; text-transform:uppercase;
  color:var(--nova-700); }
.eyebrow::before { content:""; width:18px; height:2px; border-radius:2px; background:var(--grad-accent); }

.chip { display:inline-block; font-size:11px; font-weight:700; letter-spacing:.08em;
  text-transform:uppercase; color:var(--nova-700); background:var(--nova-50);
  border:1px solid var(--nova-100); padding:4px 11px; border-radius:999px; }

/* glow backdrop shared by heroes */
.glow { position:relative; overflow:hidden; }
.glow::before { content:""; position:absolute; inset:0; z-index:0; pointer-events:none;
  background:
    radial-gradient(620px 300px at 82% -8%, rgba(34,211,238,.16), transparent 60%),
    radial-gradient(720px 360px at 12% 0%, rgba(37,99,235,.14), transparent 55%),
    linear-gradient(180deg,var(--tint),#fff 78%); }
.glow > * { position:relative; z-index:1; }

/* ---------- article ---------- */
.article-hero { padding:46px 0 26px; border-bottom:1px solid var(--line); }
.article-hero .back { font-size:13px; font-weight:600; color:var(--muted); }
.article-hero .back:hover { color:var(--nova-700); text-decoration:none; }
.eyebrow-line { margin-top:16px; }
.article-hero h1 { font-size:clamp(32px,5.2vw,48px); line-height:1.1; letter-spacing:-.025em;
  color:var(--ink); font-weight:800; margin:16px 0 12px; }
.article-hero .dek { font-size:21px; line-height:1.5; color:var(--muted); margin:0 0 22px; max-width:640px; }
.meta { display:flex; align-items:center; gap:12px; font-size:14px; color:var(--muted); }
.meta .avatar { width:34px; height:34px; border-radius:50%; background:var(--grad-blue);
  color:#fff; font-weight:800; font-size:14px; display:grid; place-items:center;
  box-shadow:0 4px 12px rgba(37,99,235,.3); }
.meta .author { font-weight:700; color:var(--ink); }
.meta .dot { width:3px; height:3px; border-radius:50%; background:var(--muted); opacity:.6; }

.article-body { padding:36px 0 8px; }

/* table of contents */
.toc { background:var(--surface); border:1px solid var(--line); border-radius:14px;
  padding:18px 22px; margin:0 0 34px; }
.toc .toc-title { font-size:12px; font-weight:700; letter-spacing:.1em; text-transform:uppercase;
  color:var(--muted); margin:0 0 10px; }
.toc ol { margin:0; padding:0; list-style:none; counter-reset:toc; }
.toc li { counter-increment:toc; margin:0 0 7px; padding-left:28px; position:relative; font-size:15px; }
.toc li::before { content:counter(toc,decimal-leading-zero); position:absolute; left:0; top:0;
  font-size:12px; font-weight:700; color:var(--nova-600); font-variant-numeric:tabular-nums; }
.toc a { color:var(--body); font-weight:500; }
.toc a:hover { color:var(--nova-700); }

/* prose */
.prose { font-size:18px; }
.prose > p:first-of-type { font-size:20px; line-height:1.6; color:var(--ink); }
.prose h2 { font-size:27px; line-height:1.25; letter-spacing:-.015em; color:var(--ink);
  font-weight:800; margin:46px 0 14px; padding-top:6px; scroll-margin-top:90px; position:relative; }
.prose h2::before { content:""; display:block; width:42px; height:4px; border-radius:3px;
  background:var(--grad-accent); margin-bottom:14px; }
.prose h3 { font-size:20px; color:var(--ink); font-weight:700; margin:30px 0 8px; scroll-margin-top:90px; }
.prose p { margin:0 0 18px; }
.prose strong { color:var(--ink); font-weight:700; }
.prose a { color:var(--nova-700); text-decoration:underline; text-decoration-color:var(--nova-200);
  text-underline-offset:3px; text-decoration-thickness:2px; transition:text-decoration-color .15s; }
.prose a:hover { text-decoration-color:var(--nova-600); }
.prose ul, .prose ol { margin:0 0 22px; padding:0; }
.prose ul li, .prose ol li { position:relative; margin:0 0 12px; padding-left:30px; list-style:none; }
.prose ul li::before { content:""; position:absolute; left:6px; top:.62em; width:8px; height:8px;
  border-radius:50%; background:var(--grad-accent); box-shadow:0 0 0 4px var(--nova-50); }
.prose ol { counter-reset:li; }
.prose ol li { counter-increment:li; }
.prose ol li::before { content:counter(li); position:absolute; left:0; top:.05em;
  width:22px; height:22px; border-radius:7px; background:var(--nova-50); color:var(--nova-700);
  font-size:13px; font-weight:800; display:grid; place-items:center; }
.prose blockquote { margin:26px 0; padding:18px 24px; border:0; border-left:4px solid transparent;
  border-image:var(--grad-accent) 1; background:linear-gradient(90deg,var(--nova-50),#fff);
  border-radius:0 12px 12px 0; color:var(--ink); font-size:19px; font-weight:500; line-height:1.55; }
.prose code { background:var(--surface); border:1px solid var(--line); border-radius:6px;
  padding:2px 7px; font-family:"JetBrains Mono",Consolas,monospace; font-size:.88em; color:var(--nova-700); }
.prose pre { background:#0b1220; color:#e2e8f0; border-radius:12px; padding:18px 20px; overflow:auto; }
.prose pre code { background:none; border:0; color:inherit; padding:0; }

/* ---------- FAQ ---------- */
.faq { margin:52px 0 8px; }
.faq h2 { font-size:27px; color:var(--ink); font-weight:800; margin:0 0 18px; letter-spacing:-.015em; }
.faq details { border:1px solid var(--line); border-radius:14px; padding:2px 20px; margin-bottom:12px;
  background:#fff; transition:border-color .15s, box-shadow .15s; }
.faq details[open] { border-color:var(--nova-200); box-shadow:var(--shadow-card); }
.faq summary { cursor:pointer; font-weight:700; color:var(--ink); padding:15px 0; list-style:none;
  font-size:17px; display:flex; justify-content:space-between; gap:16px; align-items:center; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; color:var(--nova-600); font-weight:800; font-size:22px; line-height:1; }
.faq details[open] summary::after { content:"\2212"; }
.faq details p { margin:0 0 16px; color:var(--body); }

/* ---------- CTA ---------- */
.cta { margin:56px 0; padding:44px 32px; border-radius:24px; text-align:center; position:relative;
  overflow:hidden; background:var(--grad-blue); color:#fff;
  box-shadow:0 24px 60px rgba(29,78,216,.32); }
.cta::after { content:""; position:absolute; inset:0; pointer-events:none;
  background:radial-gradient(420px 200px at 88% 0%, rgba(34,211,238,.45), transparent 60%); }
.cta-mark { position:relative; z-index:1; height:40px; width:40px; margin:0 auto 12px;
  filter:drop-shadow(0 0 14px rgba(34,211,238,.7)); }
.cta h2 { position:relative; z-index:1; margin:0 0 6px; font-size:27px; font-weight:800; color:#fff; letter-spacing:-.015em; }
.cta p { position:relative; z-index:1; margin:0 auto 20px; color:rgba(255,255,255,.88); max-width:460px; }
.cta a { position:relative; z-index:1; display:inline-block; background:#fff; color:var(--nova-700);
  font-weight:800; padding:13px 30px; border-radius:13px; font-size:17px;
  box-shadow:0 8px 20px rgba(0,0,0,.16); }
.cta a:hover { text-decoration:none; transform:translateY(-1px); }

/* ---------- related ---------- */
.related { margin:52px 0; }
.related h2 { font-size:14px; letter-spacing:.1em; text-transform:uppercase; color:var(--muted);
  font-weight:700; margin:0 0 16px; }
.related-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr)); gap:16px; }
.related-grid a { display:block; border:1px solid var(--line); border-radius:14px; padding:18px;
  background:#fff; color:var(--ink); font-weight:700; font-size:15px; line-height:1.4;
  transition:transform .15s, box-shadow .15s, border-color .15s; }
.related-grid a:hover { text-decoration:none; transform:translateY(-3px);
  border-color:var(--nova-200); box-shadow:var(--shadow-glow); }
.related-grid a .arrow { display:block; margin-top:12px; color:var(--nova-600); font-weight:800; }

/* ---------- index (blog home) ---------- */
.index-hero { padding:66px 0 40px; text-align:center; }
.index-hero h1 { font-size:clamp(38px,6.5vw,60px); color:var(--ink); font-weight:800;
  letter-spacing:-.03em; margin:16px 0 12px; line-height:1.05; }
.index-hero .grad { background:var(--grad-accent); -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent; }
.index-hero p { font-size:20px; color:var(--muted); max-width:600px; margin:0 auto; line-height:1.55; }
.index-mark { height:56px; width:56px; margin:0 auto; filter:drop-shadow(0 0 18px rgba(34,211,238,.55)); }

.cards { display:grid; grid-template-columns:repeat(auto-fill,minmax(330px,1fr)); gap:22px; padding:8px 0 56px; }
.card { position:relative; border:1px solid var(--line); border-radius:18px; padding:26px 24px 22px;
  background:#fff; box-shadow:var(--shadow-card); overflow:hidden;
  transition:transform .16s ease, box-shadow .16s ease, border-color .16s ease;
  display:flex; flex-direction:column; height:100%; }
.card::before { content:""; position:absolute; top:0; left:0; right:0; height:4px;
  background:var(--grad-accent); transform:scaleX(0); transform-origin:left; transition:transform .25s ease; }
.card:hover { transform:translateY(-5px); border-color:var(--nova-200); box-shadow:var(--shadow-glow); }
.card:hover::before { transform:scaleX(1); }
.card .chip { align-self:flex-start; margin-bottom:14px; }
.card h2 { font-size:21px; line-height:1.3; color:var(--ink); font-weight:800; margin:0 0 10px; letter-spacing:-.01em; }
.card p { font-size:15px; color:var(--muted); margin:0 0 18px; flex:1; line-height:1.6; }
.card .read { font-size:13px; font-weight:700; color:var(--nova-700); letter-spacing:.02em; }
.card .read .ar { transition:transform .2s; display:inline-block; }
.card:hover .read .ar { transform:translateX(4px); }
.card-link { text-decoration:none; display:block; height:100%; }
.card-link:hover { text-decoration:none; }

/* ---------- footer ---------- */
.site-footer { border-top:1px solid var(--line); background:var(--surface); margin-top:56px; }
.foot { max-width:1120px; margin:0 auto; padding:42px 24px; }
.foot .row { display:flex; flex-wrap:wrap; gap:22px; justify-content:space-between; align-items:center; }
.foot .links { display:flex; gap:22px; flex-wrap:wrap; }
.foot .links a { color:var(--muted); font-size:14px; }
.foot .links a:hover { color:var(--nova-700); }
.foot .copy { color:var(--muted); font-size:14px; }

@media (max-width:560px){
  body { font-size:17px; }
  .article-hero h1 { font-size:30px; }
  .article-hero .dek { font-size:18px; }
  .cta { padding:34px 22px; }
}