:root{--bg:#f5f7fb;--surface:#fff;--text:#1f2937;--muted:#64748b;--primary:#2563eb;--primary-dark:#1d4ed8;--primary-soft:#eaf1ff;--accent:#7c3aed;--border:#dbe4f0;--code:#0f172a;--radius:18px;--shadow:0 14px 35px rgba(37,99,235,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg);line-height:1.65}a{text-decoration:none;color:inherit}.container{width:min(1120px,calc(100% - 32px));margin:0 auto}.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);border-bottom:1px solid var(--border);backdrop-filter:blur(10px)}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;flex-direction:column;line-height:1.1;font-weight:900;letter-spacing:-.03em}.brand span:first-child{color:var(--primary);font-size:1.28rem}.brand span:last-child{color:var(--muted);font-size:.82rem;font-weight:700}.nav-links{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:.95rem}.nav-links a:hover{color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:11px 18px;font-weight:800;border:1px solid transparent;transition:.2s}.btn-primary{background:var(--primary);color:white}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}.btn-secondary{background:white;border-color:var(--border);color:var(--text)}.btn-secondary:hover{border-color:#b9cdf8;color:var(--primary)}.hero{padding:64px 0 42px;background:radial-gradient(circle at top left,rgba(37,99,235,.18),transparent 36%),linear-gradient(180deg,#fff 0%,var(--bg) 100%);border-bottom:1px solid var(--border)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:34px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--primary-soft);color:var(--primary-dark);border:1px solid #b9cdf8;border-radius:999px;padding:7px 12px;font-size:.9rem;font-weight:800;margin-bottom:18px}h1{font-size:clamp(2.2rem,5vw,4.2rem);line-height:1.03;letter-spacing:-.055em;margin:0 0 18px}.lead{color:var(--muted);font-size:1.16rem;max-width:760px;margin:0 0 26px}.panel,.box,.side-card,.guide-card,.exercise-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 20px rgba(15,23,42,.05)}.panel{padding:26px}.check-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}.check-list li{display:grid;grid-template-columns:28px 1fr;gap:10px;color:var(--muted)}.icon{width:28px;height:28px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--primary-soft);color:var(--primary);font-weight:900}section{padding:54px 0}.section-title{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:24px}.section-title h2{font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.1;letter-spacing:-.045em;margin:0}.section-title p{color:var(--muted);max-width:540px;margin:0}.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.guide-card,.exercise-card{display:block;padding:22px;transition:.2s}.guide-card:hover,.exercise-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#b9cdf8}.tag{color:var(--primary);font-weight:900;font-size:.82rem;text-transform:uppercase;letter-spacing:.06em}.guide-card h3,.exercise-card h3{margin:8px 0 8px;line-height:1.25;letter-spacing:-.025em}.guide-card p,.exercise-card p{margin:0 0 14px;color:var(--muted)}.read-more{color:var(--primary);font-weight:900}.layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start;padding:42px 0}.article{display:grid;gap:22px}.box{padding:28px}.box h2{font-size:clamp(1.4rem,3vw,2rem);line-height:1.18;letter-spacing:-.04em;margin:0 0 14px}.box h3{margin:24px 0 8px;letter-spacing:-.025em}.box p{margin:0 0 14px}.box ul,.box ol{padding-left:22px}.code{background:var(--code);color:#dbeafe;border-radius:14px;padding:16px;overflow:auto;font-family:Consolas,Monaco,monospace;margin:16px 0;white-space:pre-wrap}.note{background:#fff7ed;border:1px solid #fed7aa;color:#8a3d00;border-radius:16px;padding:16px;margin:16px 0}.side-card{padding:20px;margin-bottom:18px}.side-card h3{margin:0 0 8px}.side-card p{color:var(--muted);margin:0 0 14px}.search-box{display:flex;gap:10px;background:white;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px;max-width:720px}.search-box input{flex:1;border:0;outline:0;padding:12px 14px;font-size:1rem}.quick-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.chip{background:#fff;border:1px solid var(--border);border-radius:999px;padding:8px 12px;color:var(--muted);font-size:.92rem}.chip:hover{color:var(--primary);border-color:#b9cdf8;background:var(--primary-soft)}.cta{background:linear-gradient(135deg,#1d4ed8 0%,#312e81 100%);color:#fff;border-radius:28px;padding:30px;display:flex;align-items:center;justify-content:space-between;gap:24px}.cta h2{margin:0 0 8px}.cta p{color:#dbeafe;margin:0;max-width:680px}.footer{padding:34px 0;border-top:1px solid var(--border);background:#fff;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:.92rem;margin-bottom:22px}.breadcrumb a{color:var(--primary-dark);font-weight:800}.toc{position:sticky;top:92px}.toc a{display:block;padding:8px 0;color:var(--muted);border-bottom:1px solid var(--border)}.toc strong{display:block;color:var(--primary-dark);margin-bottom:10px}@media(max-width:940px){.hero-grid,.layout{grid-template-columns:1fr}.guide-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.toc{position:static}}@media(max-width:680px){.nav{align-items:flex-start;flex-direction:column;padding:18px 0}.nav-links{flex-wrap:wrap}.guide-grid{grid-template-columns:1fr}.search-box,.cta,.section-title{flex-direction:column;align-items:flex-start}.box,.panel{padding:22px}}

/* Pagine esercizi ed esempi ampliate */
.article .box li{margin-bottom:8px}.article .box ol li::marker{font-weight:800;color:var(--primary)}.demo-preview{border:1px dashed #b9cdf8;background:#f8fbff;border-radius:18px;padding:18px;margin:16px 0}.article .cta .btn-secondary{background:#fff;color:var(--primary-dark);border-color:rgba(255,255,255,.55)}.article .cta .btn-secondary:hover{background:var(--primary-soft);color:var(--primary-dark)}

/* Navigazione precedente/successivo in fondo a lezioni, esercizi ed esempi */
.article .cta > div:last-child{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:center;
}
.article .cta > div:last-child .btn{
  margin:0;
}
@media(max-width:680px){
  .article .cta > div:last-child{
    width:100%;
  }
}