:root{
  --bg:#f7f8fb;
  --surface:#ffffff;
  --surface-2:#f1f4f9;
  --border:rgba(15,23,42,0.09);
  --border-strong:rgba(15,23,42,0.16);
  --text:#0f172a;
  --text-muted:#475569;
  --text-subtle:#6b7280;
  --primary:#2563eb;
  --primary-hover:#1d4ed8;
  --primary-soft:#eff4ff;
  --accent:#0f172a;
  --warn-bg:#fffbeb;
  --warn-border:#fde68a;
  --warn-text:#78350f;
  --radius-sm:8px;
  --radius:12px;
  --radius-lg:16px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05);
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
  --shadow-lg:0 14px 40px rgba(15,23,42,.12);
  --ease:cubic-bezier(.32,.72,0,1);
  --font:'Inter',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font:16px/1.65 var(--font);
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  letter-spacing:-0.005em;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-hover);text-decoration:underline}
.container{width:100%;max-width:760px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  background:#0b1220;
  border-bottom:1px solid rgba(255,255,255,.06);
  padding:14px 0;
  position:sticky;top:0;z-index:50;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:inline-flex;align-items:center;text-decoration:none}
.brand:hover{text-decoration:none}
.brand-wordmark{
  color:#fff;font-weight:700;
  font-size:22px;letter-spacing:-0.025em;
  line-height:1;
}
@media (min-width:768px){.brand-wordmark{font-size:26px}}
.footer-brand{display:inline-flex;align-items:center;text-decoration:none}
.footer-brand .brand-wordmark{font-size:20px}
.footer-brand:hover{text-decoration:none}
.footer-brand:hover .brand-wordmark{color:#dbeafe}
.header-tag{
  font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:rgba(255,255,255,.55);font-weight:600;
}
@media (max-width:520px){.header-tag{display:none}}

/* Article */
.article{padding:32px 20px 64px;max-width:760px}
@media (min-width:768px){.article{padding:56px 20px 96px}}

.eyebrow{
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  font-weight:700;color:var(--primary);
  margin:0 0 14px;
}

.headline{
  font-size:clamp(28px,4.6vw,44px);
  line-height:1.08;
  letter-spacing:-0.028em;
  font-weight:800;
  margin:0 0 20px;
  color:#0b1220;
}

.byline{
  display:flex;flex-direction:column;gap:6px;
  padding-bottom:18px;border-bottom:1px solid var(--border);
  margin-bottom:28px;
}
.byline-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--text-muted);font-size:14px}
.byline .author{font-weight:600;color:var(--text)}
.byline .dot{color:var(--text-subtle)}
.byline-disclosure{margin:0;font-size:12px;color:var(--text-subtle);font-style:italic;letter-spacing:.02em}

.hero-fig{margin:0 0 32px}
.hero-fig img{
  width:100%;border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  border:1px solid var(--border);
  aspect-ratio:1200/628;object-fit:cover;
}
.hero-fig figcaption,.inline-fig figcaption{
  margin-top:10px;font-size:13px;color:var(--text-subtle);
  font-style:italic;text-align:center;line-height:1.55;
}

.lede{
  font-size:19px;line-height:1.6;color:var(--text);
  margin:0 0 24px;
}
.lede strong{color:#0b1220}

.article p{margin:0 0 20px;font-size:17px;line-height:1.7;color:var(--text-muted)}
.article p strong{color:var(--text)}

.article h2{
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.2;letter-spacing:-0.02em;
  font-weight:700;color:#0b1220;
  margin:40px 0 16px;
}
.article h3{
  font-size:18px;font-weight:700;color:var(--text);
  margin:0 0 6px;letter-spacing:-0.01em;
}

.inline-link{
  color:var(--primary);font-weight:600;
  border-bottom:1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  transition:all .15s var(--ease);
}
.inline-link:hover{color:var(--primary-hover);border-bottom-color:var(--primary-hover);text-decoration:none}

.inline-fig{margin:32px auto;max-width:560px}
.inline-fig img{
  width:100%;border-radius:var(--radius);
  box-shadow:var(--shadow);border:1px solid var(--border);
  background:#fff;
}

/* Steps */
.steps{list-style:none;padding:0;margin:24px 0 40px;display:grid;gap:14px}
.steps li{
  display:flex;gap:16px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:18px 20px;
  box-shadow:var(--shadow-sm);
}
.step-num{
  flex:none;display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:50%;
  background:var(--primary);color:#fff;
  font-weight:700;font-size:14px;letter-spacing:-0.01em;
}
.steps p{margin:2px 0 0;font-size:15px;color:var(--text-muted);line-height:1.55}

/* CTA card */
.cta-card{
  background:linear-gradient(180deg,#ffffff 0%, #f6f9ff 100%);
  border:1px solid var(--border-strong);
  border-radius:var(--radius-lg);
  padding:28px 22px;
  margin:36px 0 28px;
  box-shadow:var(--shadow);
  position:relative;overflow:hidden;
}
.cta-card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:4px;
  background:linear-gradient(90deg,var(--primary),#60a5fa,var(--primary));
}
.cta-heading{
  font-size:clamp(20px,2.4vw,26px);font-weight:800;
  color:#0b1220;margin:0 0 6px;letter-spacing:-0.02em;text-align:center;
}
.cta-sub{text-align:center;color:var(--text-muted);font-size:15px;margin:0 0 22px}
.age-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:0 0 20px;
}
@media (min-width:560px){.age-grid{grid-template-columns:repeat(3,1fr)}}
.age-btn{
  display:flex;align-items:center;justify-content:center;
  min-height:60px;padding:14px 16px;
  background:var(--primary);color:#fff;
  font-weight:700;font-size:17px;letter-spacing:-0.01em;
  border-radius:var(--radius);text-decoration:none;
  border:1px solid transparent;
  box-shadow:0 1px 2px rgba(37,99,235,.18), 0 4px 12px rgba(37,99,235,.18);
  transition:transform .15s var(--ease), background .18s var(--ease), box-shadow .2s var(--ease);
  text-align:center;
}
.age-btn:hover{
  background:var(--primary-hover);
  transform:translateY(-1px);
  box-shadow:0 2px 6px rgba(37,99,235,.22), 0 10px 22px rgba(37,99,235,.22);
  color:#fff;text-decoration:none;
}
.age-btn:active{transform:translateY(0)}
.age-btn:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 35%,transparent);outline-offset:2px}

.cta-fineprint{
  font-size:12.5px;line-height:1.55;color:var(--text-subtle);
  text-align:center;margin:0;padding:0 4px;
}

/* Callout */
.callout{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--warn-bg);
  border:1px solid var(--warn-border);
  border-radius:var(--radius);
  padding:18px 20px;margin:32px 0 0;
}
.callout-icon{
  flex:none;width:36px;height:36px;border-radius:50%;
  background:#fef3c7;color:#92400e;
  display:inline-flex;align-items:center;justify-content:center;
}
.callout-icon svg{width:20px;height:20px}
.callout-title{margin:0 0 4px;font-size:15px;font-weight:700;color:var(--warn-text)}
.callout p{margin:0;font-size:14px;line-height:1.6;color:#5b3a08}
.callout strong{color:#5b3a08}

/* Footer */
.site-footer{
  background:#0b1220;color:#cbd5e1;
  padding:48px 0 36px;margin-top:48px;
  font-size:13.5px;line-height:1.65;
}
.site-footer .container{max-width:1100px}
.footer-top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}
.footer-nav{display:flex;flex-wrap:wrap;gap:18px}
.footer-nav a{color:#cbd5e1;font-weight:500;font-size:14px}
.footer-nav a:hover{color:#fff;text-decoration:underline}

.footer-rule{
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(148,163,184,.3),transparent);
  margin:28px 0 24px;
}

.sources p.sources-title{font-weight:600;color:#e2e8f0;margin:0 0 8px;font-size:13px}
.sources ul{margin:0 0 28px;padding-left:18px;list-style:disc;color:#94a3b8}
.sources a{color:#94a3b8;font-size:13px}
.sources a:hover{color:#bfdbfe}

.disclosures{border-top:1px solid rgba(148,163,184,.18);padding-top:24px}
.disc-heading{
  font-size:12px;text-transform:uppercase;letter-spacing:.14em;
  font-weight:700;color:#e2e8f0;margin:0 0 14px;
}
.disclosures p{margin:0 0 12px;color:#94a3b8;font-size:13px;line-height:1.7}
.disclosures strong{color:#e2e8f0;font-weight:600}
.copyright{text-align:center;margin-top:20px !important;color:#64748b !important;font-size:12.5px !important}

/* Focus */
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}