/* ═══════════════════════════════════════════════════════════════
   Shield Tracker — Learn Center stylesheet
   Mirrors the site design system (DM Serif Display / DM Sans / JetBrains Mono;
   navy-blue-emerald palette). Shared by all /learn/ pages.
   ═══════════════════════════════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --navy:#0f1a2e;--navy-light:#1a2a4a;--slate:#475569;--slate-light:#94a3b8;
  --cream:#faf9f7;--white:#fff;--blue:#2563eb;--blue-light:#3b82f6;--blue-pale:#dbeafe;
  --emerald:#059669;--emerald-light:#d1fae5;--amber:#d97706;--gold:#f59e0b;--coral:#ef4444;
  --line:rgba(0,0,0,.08);
  --font-display:'DM Serif Display',Georgia,serif;
  --font-body:'DM Sans',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--navy);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--blue)}

.container{max-width:820px;margin:0 auto;padding:0 32px}
.container--wide{max-width:1140px;margin:0 auto;padding:0 32px}

/* ═══ Nav ═══ */
.lnav{background:rgba(255,255,255,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
.lnav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1140px;margin:0 auto;padding:0 32px}
.lnav-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--navy)}
.lnav-brand-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--navy),var(--blue));border-radius:9px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:.95rem}
.lnav-brand-text{font-family:var(--font-display);font-size:1.2rem}
.lnav-right{display:flex;align-items:center;gap:28px}
.lnav-right a{font-size:.875rem;font-weight:500;color:var(--slate);text-decoration:none;transition:color .2s}
.lnav-right a:hover{color:var(--navy)}
.lnav-cta{background:var(--navy);color:#fff!important;padding:9px 20px;border-radius:8px;font-weight:600}
.lnav-cta:hover{background:var(--blue)!important}

/* ═══ Breadcrumb + eyebrow ═══ */
.breadcrumb{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;color:var(--slate-light);padding:24px 0 0}
.breadcrumb a{color:var(--slate);text-decoration:none}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb span{margin:0 8px;opacity:.5}
.eyebrow{font-family:var(--font-mono);font-size:.6875rem;font-weight:500;text-transform:uppercase;letter-spacing:.15em;color:var(--blue);margin-bottom:14px;display:flex;align-items:center;gap:10px}
.eyebrow::before{content:'';width:26px;height:1.5px;background:var(--blue);display:inline-block}

/* ═══ Article header ═══ */
.article-head{padding:28px 0 32px;border-bottom:1px solid var(--line)}
.article-head h1{font-family:var(--font-display);font-size:2.6rem;line-height:1.12;letter-spacing:-.01em;margin-bottom:16px}
.article-meta{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:.8125rem;color:var(--slate-light)}
.article-meta strong{color:var(--slate);font-weight:600}
.article-meta i{color:var(--blue);margin-right:5px}

/* ═══ Definition-first answer box (extractable opening) ═══ */
.answer-box{background:linear-gradient(180deg,var(--blue-pale),#eef4ff);border:1px solid rgba(37,99,235,.18);border-left:4px solid var(--blue);border-radius:12px;padding:24px 28px;margin:36px 0}
.answer-box .answer-label{font-family:var(--font-mono);font-size:.6875rem;text-transform:uppercase;letter-spacing:.12em;color:var(--blue);font-weight:600;margin-bottom:8px}
.answer-box p{font-size:1.0625rem;line-height:1.65;color:var(--navy);margin:0}
.answer-box p+p{margin-top:12px}

/* ═══ On-page table of contents ═══ */
.toc{border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:32px 0;background:var(--cream)}
.toc h2{font-family:var(--font-mono)!important;font-size:.6875rem!important;text-transform:uppercase;letter-spacing:.12em;color:var(--slate);margin:0 0 12px!important;font-weight:600}
.toc ol{list-style:none;margin:0;padding:0;columns:2;column-gap:32px}
.toc li{margin-bottom:8px;font-size:.875rem;break-inside:avoid}
.toc a{color:var(--slate);text-decoration:none}
.toc a:hover{color:var(--blue);text-decoration:underline}

/* ═══ Article body typography ═══ */
.article{padding:8px 0 32px}
.article h2{font-family:var(--font-display);font-size:1.7rem;line-height:1.2;margin:44px 0 16px;scroll-margin-top:88px}
.article h3{font-size:1.125rem;font-weight:700;margin:28px 0 10px;color:var(--navy)}
.article p{margin-bottom:18px;color:var(--slate);font-size:1rem}
.article ul,.article ol{margin:0 0 18px 22px;color:var(--slate);font-size:1rem}
.article li{margin-bottom:10px}
.article strong{color:var(--navy);font-weight:600}
.article a{color:var(--blue);text-decoration:underline;text-underline-offset:2px}
.article a[target="_blank"]::after{content:'\2197';font-size:.7em;vertical-align:super;margin-left:1px;opacity:.6;text-decoration:none;display:inline-block}

/* ═══ Fact box / callouts ═══ */
.factbox{background:var(--cream);border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin:28px 0}
.factbox .factbox-label{font-family:var(--font-mono);font-size:.6875rem;text-transform:uppercase;letter-spacing:.1em;color:var(--slate);font-weight:600;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.factbox .factbox-label i{color:var(--blue)}
.factbox ul{margin:0 0 0 20px}.factbox li{font-size:.9375rem;margin-bottom:8px}
.callout{background:var(--blue-pale);border-radius:10px;padding:18px 22px;margin:24px 0;font-size:.9375rem;color:var(--navy)}
.callout i{color:var(--blue);margin-right:8px}
.callout.green{background:var(--emerald-light);color:#065f46}.callout.green i{color:var(--emerald)}
.callout.amber{background:#fef3c7;color:#92400e}.callout.amber i{color:var(--amber)}

/* ═══ Data table ═══ */
.article table{width:100%;border-collapse:collapse;margin:24px 0;font-size:.9rem}
.article th,.article td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.article th{background:var(--cream);font-weight:700;color:var(--navy);font-size:.8125rem;text-transform:uppercase;letter-spacing:.03em}
.article tr:hover td{background:#fafbfc}

/* ═══ FAQ (native <details>, no JS) ═══ */
.faq-section{margin:48px 0 8px}
.faq-section h2{margin-bottom:8px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{cursor:pointer;padding:18px 0;font-weight:600;font-size:1rem;color:var(--navy);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'\f078';font-family:'Font Awesome 6 Free';font-weight:900;font-size:.7rem;color:var(--slate-light);transition:transform .3s;flex-shrink:0}
.faq-item[open] summary::after{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 0 20px;color:var(--slate);font-size:.9375rem;line-height:1.7}
.faq-item .faq-a p{margin-bottom:12px}.faq-item .faq-a p:last-child{margin-bottom:0}

/* ═══ Sources / citations ═══ */
.sources{margin:48px 0 8px}
.sources h2{font-size:1.25rem!important}
.sources ol{margin:16px 0 0 20px;font-size:.875rem;color:var(--slate)}
.sources li{margin-bottom:10px}
.sources a{color:var(--blue);word-break:break-word}

/* ═══ Demo CTA card ═══ */
.cta-card{background:var(--navy);color:#fff;border-radius:16px;padding:40px 40px;margin:56px 0 32px;position:relative;overflow:hidden}
.cta-card::before{content:'';position:absolute;top:-120px;right:-80px;width:380px;height:380px;background:radial-gradient(circle,rgba(37,99,235,.18),transparent 70%);pointer-events:none}
.cta-card h2{font-family:var(--font-display);font-size:1.6rem;color:#fff;margin:0 0 10px;position:relative}
.cta-card p{color:var(--slate-light);font-size:.9375rem;margin:0 0 22px;max-width:560px;position:relative}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:10px;font-size:.9375rem;font-weight:600;text-decoration:none;transition:all .25s;border:none;cursor:pointer;font-family:var(--font-body)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 2px 12px rgba(37,99,235,.35)}
.btn-primary:hover{background:#1d4ed8;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.25);margin-left:10px}
.btn-ghost:hover{border-color:#fff}

/* ═══ Related links ═══ */
.related{margin:40px 0;padding:24px 0 0;border-top:1px solid var(--line)}
.related h2{font-family:var(--font-mono)!important;font-size:.6875rem!important;text-transform:uppercase;letter-spacing:.12em;color:var(--slate);margin-bottom:14px!important;font-weight:600}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.related-grid a{display:flex;align-items:center;gap:10px;padding:14px 16px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--navy);font-size:.9rem;font-weight:500;transition:all .2s}
.related-grid a:hover{border-color:var(--blue);background:var(--cream)}
.related-grid a i{color:var(--blue)}

/* ═══ Trademark / independence disclaimer ═══ */
.disclaimer{font-size:.78rem;line-height:1.6;color:var(--slate-light);border-top:1px solid var(--line);padding:24px 0;margin-top:24px}
.disclaimer strong{color:var(--slate)}

/* ═══ Hub page ═══ */
.hub-hero{background:var(--cream);border-bottom:1px solid var(--line);padding:56px 0 48px}
.hub-hero h1{font-family:var(--font-display);font-size:2.9rem;line-height:1.1;letter-spacing:-.015em;margin-bottom:18px;max-width:760px}
.hub-hero p{font-size:1.125rem;color:var(--slate);max-width:680px}
.hub-section{padding:48px 0 8px}
.hub-section-label{display:flex;align-items:baseline;gap:14px;margin-bottom:20px}
.hub-section-label h2{font-family:var(--font-display);font-size:1.6rem;margin:0}
.hub-section-label span{font-size:.875rem;color:var(--slate-light)}
.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:16px}
.hub-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;padding:24px;text-decoration:none;color:var(--navy);background:#fff;transition:all .25s}
.hub-card:hover{border-color:var(--blue);box-shadow:0 8px 28px rgba(0,0,0,.06);transform:translateY(-2px)}
.hub-card-icon{width:42px;height:42px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:1rem;margin-bottom:14px;background:var(--blue-pale);color:var(--blue)}
.hub-card.green .hub-card-icon{background:var(--emerald-light);color:var(--emerald)}
.hub-card.amber .hub-card-icon{background:#fef3c7;color:var(--amber)}
.hub-card h3{font-size:1.0625rem;font-weight:700;margin-bottom:7px;line-height:1.3}
.hub-card p{font-size:.875rem;color:var(--slate);line-height:1.6;margin:0}
.hub-card .hub-card-tag{margin-top:14px;font-family:var(--font-mono);font-size:.7rem;color:var(--blue);font-weight:500}
.hub-card.soon{opacity:.6;pointer-events:none}
.hub-card.soon .hub-card-tag{color:var(--slate-light)}

/* ═══ Footer ═══ */
.lfooter{background:#070e1a;color:rgba(255,255,255,.5);padding:48px 0 36px;margin-top:64px}
.lfooter-inner{max-width:1140px;margin:0 auto;padding:0 32px}
.lfooter-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;padding-bottom:24px;border-bottom:1px solid rgba(255,255,255,.08)}
.lfooter-brand{display:flex;align-items:center;gap:10px;color:#fff;font-family:var(--font-display);font-size:1.1rem}
.lfooter-brand-icon{width:30px;height:30px;background:rgba(255,255,255,.06);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--blue-light);font-size:.8rem}
.lfooter-links{display:flex;gap:24px;flex-wrap:wrap}
.lfooter-links a{color:rgba(255,255,255,.5);text-decoration:none;font-size:.8125rem}
.lfooter-links a:hover{color:#fff}
.lfooter-disclaimer{font-size:.75rem;line-height:1.65;color:rgba(255,255,255,.35);padding-top:20px;max-width:880px}

/* ═══ Responsive ═══ */
@media(max-width:900px){
  .hub-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .container,.container--wide{padding:0 20px}
  .lnav-inner{padding:0 20px;height:60px}
  .lnav-right{gap:16px}
  .lnav-right a:not(.lnav-cta){display:none}
  .article-head h1{font-size:1.9rem}
  .hub-hero h1{font-size:2rem}
  .hub-hero p{font-size:1rem}
  .article h2{font-size:1.4rem}
  .toc ol{columns:1}
  .hub-grid{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .cta-card{padding:28px 24px}
  .lfooter-top{flex-direction:column}
}
@media(max-width:420px){
  .article-head h1{font-size:1.55rem}
  .hub-hero h1{font-size:1.6rem}
}