:root{
  --ntg-primary:#b6491f;
  --ntg-primary-dark:#3a2416;
  --ntg-accent:#c9971f;
  --ntg-bg:#fbf8f3;
  --ntg-card:#ffffff;
  --ntg-border:#eae3d6;
  --ntg-text:#241a12;
  --ntg-muted:#75695a;
  --ntg-radius:16px;
  --ntg-shadow:0 1px 2px rgba(40,25,10,.04),0 6px 20px -6px rgba(40,25,10,.10);
  --ntg-shadow-hover:0 4px 10px rgba(40,25,10,.06),0 14px 30px -10px rgba(40,25,10,.16);
}
.ntg-wrap{max-width:900px;margin:0 auto;color:var(--ntg-text);line-height:1.7;
  font-feature-settings:"kern" 1}
.ntg-wrap h2{font-size:1.55rem;font-weight:700;margin:2.4em 0 .9em;letter-spacing:-.01em;color:var(--ntg-primary-dark)}
.ntg-wrap h3{font-size:1.15rem;font-weight:700;margin:1.6em 0 .6em;color:var(--ntg-primary-dark)}
.ntg-wrap p{margin:0 0 1.1em}

/* TL;DR */
.ntg-tldr{background:linear-gradient(180deg,#fff8ec,#fbf1de);border:1px solid #f0dfb8;
  border-radius:var(--ntg-radius);padding:1.1rem 1.3rem;margin:1.2rem 0 1.8rem;font-size:1.02rem}
.ntg-tldr b{color:var(--ntg-primary-dark)}

/* Hero */
.ntg-hero{position:relative;overflow:hidden;background:
  radial-gradient(120% 140% at 100% -10%,#e2792f 0%,transparent 55%),
  linear-gradient(135deg,var(--ntg-primary) 0%,#7a2c11 55%,var(--ntg-primary-dark) 100%);
  color:#fff;border-radius:20px;padding:2.4rem 1.8rem;margin-bottom:1.6rem;
  box-shadow:var(--ntg-shadow)}
.ntg-hero:before{content:"";position:absolute;top:-40%;right:-15%;width:60%;height:180%;
  background:radial-gradient(circle,rgba(255,255,255,.10) 0%,transparent 65%);pointer-events:none}
.ntg-hero-eyebrow{display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;background:rgba(255,255,255,.16);padding:.3rem .7rem;border-radius:999px;
  margin-bottom:.9rem}
.ntg-hero h1{position:relative;margin:0 0 .6rem;font-size:clamp(1.6rem,4vw,2.2rem);font-weight:800;
  line-height:1.25;color:#fff;letter-spacing:-.01em}
.ntg-hero p{position:relative;margin:0;opacity:.94;font-size:1.02rem;color:#fff;max-width:640px}

/* Badges */
.ntg-badges{display:flex;flex-wrap:wrap;gap:.55rem;margin:1.1rem 0 1.7rem}
.ntg-badge{background:var(--ntg-card);border:1px solid var(--ntg-border);border-radius:999px;
  padding:.45rem 1rem;font-size:.85rem;color:var(--ntg-muted);display:inline-flex;align-items:center;
  gap:.35rem;box-shadow:var(--ntg-shadow)}
.ntg-badge b{color:var(--ntg-primary)}

/* Card */
.ntg-card{background:var(--ntg-card);border:1px solid var(--ntg-border);border-radius:var(--ntg-radius);
  padding:1.4rem 1.6rem;margin:1.3rem 0;box-shadow:var(--ntg-shadow)}

/* TOC */
.ntg-toc{background:var(--ntg-card);border:1px solid var(--ntg-border);border-radius:var(--ntg-radius);
  padding:1.2rem 1.5rem;margin:1.5rem 0;box-shadow:var(--ntg-shadow)}
.ntg-toc summary{cursor:pointer;font-weight:700;color:var(--ntg-primary-dark);list-style:none;
  display:flex;align-items:center;justify-content:space-between}
.ntg-toc summary::-webkit-details-marker{display:none}
.ntg-toc summary:after{content:"▾";color:var(--ntg-accent);transition:transform .2s}
.ntg-toc[open] summary:after{transform:rotate(180deg)}
.ntg-toc>ol{margin:1rem 0 0;padding-left:1.2rem;display:grid;grid-template-columns:1fr 1fr;
  gap:0 1.6rem;list-style:none}
.ntg-toc>ol>li{margin-bottom:.9rem;font-weight:700;color:var(--ntg-primary-dark);font-size:.92rem}
.ntg-toc>ol>li>ol{list-style:none;margin:.35rem 0 0;padding-left:0;font-weight:400}
.ntg-toc>ol>li>ol>li{margin-bottom:.3rem}
.ntg-toc a{color:var(--ntg-muted);text-decoration:none;font-size:.86rem}
.ntg-toc a:hover{color:var(--ntg-primary);text-decoration:underline}
@media (max-width:640px){.ntg-toc>ol{grid-template-columns:1fr}}

/* Module */
.ntg-module{background:var(--ntg-card);border:1px solid var(--ntg-border);
  border-left:4px solid var(--m-accent,var(--ntg-primary));border-radius:var(--ntg-radius);
  margin:1.5rem 0;overflow:hidden;box-shadow:var(--ntg-shadow)}
.ntg-module-head{padding:1rem 1.4rem;font-weight:700;color:var(--m-accent,var(--ntg-primary-dark));
  border-bottom:1px solid var(--ntg-border);display:flex;justify-content:space-between;gap:.6rem;
  align-items:baseline;font-size:1rem}
.ntg-module-head span{font-size:.78rem;font-weight:600;color:var(--ntg-muted)}
.ntg-lesson-list{list-style:none;margin:0;padding:0}
.ntg-lesson-list li{border-bottom:1px solid var(--ntg-border)}
.ntg-lesson-list li:last-child{border-bottom:none}
.ntg-lesson-list a{display:flex;align-items:center;gap:.8rem;padding:.8rem 1.4rem;
  text-decoration:none;color:var(--ntg-text);transition:background .15s,padding-left .15s}
.ntg-lesson-list a:hover{background:#fbf6ec;padding-left:1.6rem}
.ntg-lesson-num{flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  background:var(--m-accent,var(--ntg-primary));color:#fff;font-size:.76rem;display:flex;
  align-items:center;justify-content:center;font-weight:700;transition:transform .15s}
.ntg-lesson-list a:hover .ntg-lesson-num{transform:scale(1.12)}
.ntg-lesson-title{flex:1;font-size:.96rem}
.ntg-lesson-tag{font-size:.7rem;color:var(--ntg-muted);border:1px solid var(--ntg-border);
  border-radius:999px;padding:.15rem .6rem;white-space:nowrap;background:#faf7f0}

/* Checklist */
.ntg-checklist{list-style:none;margin:0;padding:0}
.ntg-checklist li{padding:.45rem 0 .45rem 2.1rem;position:relative}
.ntg-checklist li:before{content:"✓";position:absolute;left:0;top:.45rem;width:1.4rem;height:1.4rem;
  background:var(--ntg-accent);color:#fff;border-radius:50%;display:flex;align-items:center;
  justify-content:center;font-size:.75rem}

/* FAQ */
.ntg-faq details{border:1px solid var(--ntg-border);border-radius:12px;margin-bottom:.6rem;
  background:var(--ntg-card);overflow:hidden}
.ntg-faq summary{cursor:pointer;font-weight:700;padding:.9rem 1.1rem;color:var(--ntg-primary-dark);
  list-style:none;display:flex;justify-content:space-between;gap:.6rem}
.ntg-faq summary::-webkit-details-marker{display:none}
.ntg-faq summary:after{content:"+";color:var(--ntg-accent);font-weight:700;transition:transform .2s}
.ntg-faq details[open] summary:after{transform:rotate(45deg)}
.ntg-faq p{padding:0 1.1rem 1.1rem;margin:0;color:var(--ntg-muted)}

/* Nav 3 columns */
.ntg-nav3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.8rem;margin:2.6rem 0}
.ntg-nav3 a,.ntg-nav3 .ntg-nav-disabled{display:block;border:1px solid var(--ntg-border);
  border-radius:var(--ntg-radius);padding:1rem 1.15rem;text-decoration:none;color:var(--ntg-text);
  background:var(--ntg-card);box-shadow:var(--ntg-shadow);transition:box-shadow .15s,transform .15s}
.ntg-nav3 a:hover{box-shadow:var(--ntg-shadow-hover);transform:translateY(-2px)}
.ntg-nav3 .ntg-nav-disabled{opacity:.4;cursor:default}
.ntg-nav-label{display:block;font-size:.74rem;color:var(--ntg-muted);margin-bottom:.3rem}
.ntg-nav-title{font-weight:700;color:var(--ntg-primary-dark);font-size:.95rem}
.ntg-nav-hub{background:linear-gradient(135deg,var(--ntg-primary),#7a2c11);border-color:transparent}
.ntg-nav-hub .ntg-nav-label,.ntg-nav-hub .ntg-nav-title{color:#fff}
.ntg-video{position:relative;padding-bottom:56.25%;height:0;border-radius:var(--ntg-radius);
  overflow:hidden;margin:1.4rem 0;background:#000;box-shadow:var(--ntg-shadow)}
.ntg-video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}
.ntg-figure{margin:1.4rem 0;text-align:center}
.ntg-figure img,.ntg-figure svg{max-width:100%;height:auto;border-radius:12px;border:1px solid var(--ntg-border)}
.ntg-figure figcaption{font-size:.85rem;color:var(--ntg-muted);margin-top:.5rem}
.ntg-citation{font-size:.85rem;color:var(--ntg-muted);border-top:1px solid var(--ntg-border);padding-top:1rem;margin-top:2rem}
.ntg-related-heading{font-weight:700;color:var(--ntg-primary-dark);margin:0 0 .6rem;font-size:1rem}
.ntg-related-list{list-style:none;margin:.6rem 0 0;padding:0}
.ntg-related-list li{padding:.4rem 0}
.ntg-related-list a{color:var(--ntg-primary);text-decoration:none;font-weight:600}
.ntg-related-list a:hover{text-decoration:underline}
.ntg-badge-time{background:#eef5f0;border-color:#cfe6da;color:#2f6b4a}
@media (max-width:640px){.ntg-nav3{grid-template-columns:1fr}.ntg-nav-hub{order:-1}}