/* ---------- Shared article styles ---------- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/fonts/Inter.woff2') format('woff2-variations'),
       url('/fonts/Inter.woff2') format('woff2');
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:linear-gradient(180deg,#D8E5F4 0%,#FFFFFF 55%);
  background-attachment:fixed;
  color:#1A2B3C;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
:root{
  --navy:#FFFFFF;--navy-2:#F5F7FA;--card:#FFFFFF;--card-2:#F8FAFC;
  --line:#E2E8F0;--text:#1A2B3C;--muted:#5A6B7E;
  --accent:#F07A1F;--accent-2:#2E6FB8;--accent-3:#1F7A3D;
  --accent-soft:rgba(240,122,31,0.10);
  --accent-glow:rgba(240,122,31,0.30);--warn:#C57A00;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}

.container{width:100%;max-width:820px;margin:0 auto;padding:0 20px}
.container-wide{max-width:1100px}

/* ---------- Header ---------- */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,0.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;max-width:1100px;margin:0 auto;
}
.logo{
  font-weight:900;font-size:18px;letter-spacing:.5px;color:var(--text);
  display:flex;align-items:center;gap:8px;
}
.logo-mark{color:var(--accent);font-size:22px}
.logo-img{height:56px;width:auto;display:block}
@media(max-width:480px){.logo-img{height:44px}}
.nav-links{display:none;gap:24px;font-size:16px;font-weight:500}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--accent);text-decoration:none}
.nav-links a.current{color:var(--accent)}
@media(min-width:768px){.nav-links{display:flex}}

/* ---------- Article header ---------- */
.article-hero{
  padding:60px 0 30px;
  background:radial-gradient(ellipse at top, rgba(240,122,31,0.08), transparent 60%);
}
.crumbs{
  font-size:13px;color:var(--muted);margin-bottom:18px;
  display:flex;gap:6px;flex-wrap:wrap;
}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--accent)}
.crumbs .sep{color:#A8B5C2}
.article-hero h1{
  font-size:clamp(1.9rem,4.5vw,3rem);
  font-weight:900;line-height:1.15;letter-spacing:-.02em;
  margin-bottom:16px;
}
.article-hero h1 .accent{color:var(--accent)}
.article-meta{
  display:flex;flex-wrap:wrap;gap:18px;
  color:var(--muted);font-size:13px;margin-bottom:10px;
}
.article-meta .dot{color:#A8B5C2}
.article-lede{
  color:#3A4A5C;font-size:1.1rem;max-width:720px;
  margin-top:8px;line-height:1.6;
}

/* ---------- Prose ---------- */
.prose{padding:30px 0 60px}
.prose h2{
  font-size:1.6rem;font-weight:800;margin:40px 0 14px;letter-spacing:-.01em;
  display:flex;align-items:center;gap:10px;
}
.prose h2::before{
  content:"";width:4px;height:22px;background:var(--accent);border-radius:2px;
  flex-shrink:0;
}
.prose h3{font-size:1.2rem;font-weight:700;margin:28px 0 10px;color:var(--text)}
.prose p{margin-bottom:18px;color:#3A4A5C;font-size:16px}
.prose ul,.prose ol{margin:0 0 18px 22px;color:#3A4A5C}
.prose li{margin-bottom:8px}
.prose strong{color:var(--text)}
.prose a{color:var(--accent);border-bottom:1px solid rgba(240,122,31,.40)}
.prose a:hover{border-bottom-color:var(--accent);text-decoration:none}

.callout{
  background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent);
  padding:18px 22px;border-radius:8px;margin:22px 0;
}
.callout-warn{border-left-color:var(--warn);background:rgba(255,179,71,0.10)}
.callout-warn strong{color:#7A4A00}
.formula{
  background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent);
  padding:16px 20px;border-radius:8px;margin:18px 0;
  font-family:'Courier New',Consolas,monospace;font-size:15px;color:var(--text);
  overflow-x:auto;
}

.prose table{
  width:100%;border-collapse:collapse;margin:18px 0;
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  overflow:hidden;font-size:14px;
}
.prose th,.prose td{
  padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);
}
.prose th{
  background:var(--navy-2);color:var(--muted);
  font-size:12px;text-transform:uppercase;letter-spacing:.8px;font-weight:700;
}
.prose tr:last-child td{border-bottom:0}

/* ---------- CTA box ---------- */
.cta-box{
  background:linear-gradient(180deg,var(--card),var(--navy-2));
  border:1px solid var(--line);border-radius:14px;padding:28px;
  margin:32px 0;text-align:center;
}
.cta-box h3{
  font-size:1.25rem;font-weight:800;margin-bottom:8px;color:var(--text);
}
.cta-box p{color:var(--muted);margin-bottom:18px;font-size:15px}
.cta-btn,.prose a.cta-btn{
  display:inline-block;padding:14px 24px;background:var(--accent);color:#1A2B3C;
  font-weight:800;font-size:14px;letter-spacing:.5px;text-transform:uppercase;
  border-radius:10px;box-shadow:0 4px 24px var(--accent-glow);
  transition:transform .15s;border-bottom:0;
}
.cta-btn:hover,.prose a.cta-btn:hover{transform:translateY(-1px);text-decoration:none;border-bottom:0;color:#1A2B3C}

/* ---------- Article list cards ---------- */
.article-grid{
  display:grid;grid-template-columns:1fr;gap:20px;margin-top:10px;
}
@media(min-width:700px){.article-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.article-grid{grid-template-columns:repeat(3,1fr)}}
.article-card{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:24px;display:flex;flex-direction:column;
  transition:transform .2s,border-color .2s;
}
.article-card:hover{transform:translateY(-3px);border-color:var(--accent);text-decoration:none}
.article-card .tag{
  display:inline-block;background:var(--accent-soft);color:var(--accent);
  font-size:11px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;
  padding:4px 10px;border-radius:4px;margin-bottom:14px;width:fit-content;
}
.article-card h2{
  font-size:1.15rem;font-weight:800;line-height:1.3;margin-bottom:10px;
  color:var(--text);
}
.article-card p{color:var(--muted);font-size:14px;line-height:1.55;flex:1;margin-bottom:14px}
.article-card .read{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:.3px}

/* ---------- TOC ---------- */
.toc{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:18px 22px;margin:22px 0;
}
.toc-title{
  font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;
  font-weight:700;margin-bottom:10px;
}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin:0;padding:4px 0}
.toc a{
  color:#3A4A5C;font-size:14px;border-bottom:none;
}
.toc a:hover{color:var(--accent)}

/* ---------- Related articles ---------- */
.related{
  padding:40px 0 60px;background:var(--navy-2);border-top:1px solid var(--line);
}
.related h2{
  font-size:1.3rem;font-weight:800;margin-bottom:18px;
  display:flex;align-items:center;gap:10px;
}
.related h2::before{
  content:"";width:4px;height:22px;background:var(--accent);border-radius:2px;
}

/* ---------- Ad slots ---------- */
.ad-slot{
  margin:30px auto;display:flex;align-items:center;justify-content:center;
  background:var(--navy-2);border:1px dashed var(--line);border-radius:8px;
  color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:1px;
}
.ad-leaderboard{max-width:728px;height:90px}
.ad-rectangle{max-width:300px;height:250px}

/* ---------- Affiliate cards ---------- */
.section-title{
  font-size:1.4rem;font-weight:800;margin-bottom:16px;
  display:flex;align-items:center;gap:10px;color:var(--text);
}
.section-title::before{
  content:"";width:4px;height:22px;background:var(--accent);border-radius:2px;
}
.aff-disclosure{color:var(--muted);font-size:13px;margin:-6px 0 20px;font-style:italic}
.aff-grid{display:grid;grid-template-columns:1fr;gap:18px}
@media(min-width:640px){.aff-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.aff-grid{grid-template-columns:repeat(4,1fr)}}
.aff-card{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:24px;display:flex;flex-direction:column;
  transition:transform .2s, border-color .2s;
}
.aff-card:hover{transform:translateY(-3px);border-color:var(--accent)}
.aff-icon{font-size:2rem;margin-bottom:14px}
.aff-card h3{font-size:1.1rem;font-weight:800;margin-bottom:8px;line-height:1.3;color:var(--text)}
.aff-card p{color:var(--muted);font-size:14px;line-height:1.5;flex:1;margin-bottom:18px}
.aff-btn,.prose a.aff-btn{
  background:transparent;color:var(--accent);border:1.5px solid var(--accent);
  padding:11px 16px;font-weight:700;font-size:13px;border-radius:8px;
  text-align:center;text-transform:uppercase;letter-spacing:.5px;
  text-decoration:none;border-bottom:1.5px solid var(--accent);
  transition:all .2s;
}
.aff-btn:hover,.prose a.aff-btn:hover{background:var(--accent);color:#1A2B3C;text-decoration:none}

/* ---------- Footer ---------- */
footer.site-footer{
  background:var(--navy-2);border-top:1px solid var(--line);
  padding:40px 0 30px;text-align:center;color:var(--muted);font-size:14px;
}
footer.site-footer .logo{justify-content:center;margin-bottom:12px}
footer.site-footer .disclaimer{
  max-width:680px;margin:14px auto 0;font-size:12px;line-height:1.6;color:#6B7D90;
}
.footer-nav{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px 22px;margin:18px 0 6px;font-size:14px}
.footer-nav a{color:var(--text);text-decoration:none;font-weight:500}
.footer-nav a:hover{color:var(--accent)}
.footer-credit{color:var(--muted)}
.footer-credit a{color:var(--accent-2);font-weight:600;text-decoration:none}
.footer-credit a:hover{text-decoration:underline}