/* Shared SEO content pages — pistonsoak.eu */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
:root{--red:#c8102e;--red-dark:#a50c24;--gold:#c8972c;--bg:#f7f7f8;--text:#1a1a1a;--muted:#6b7280}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
.hero{background:linear-gradient(130deg,#07080a 0%,#111319 45%,#171a22 100%);padding:3rem 1.5rem;text-align:center;position:relative;overflow:hidden}
.hero::after{content:'';position:absolute;top:0;left:-15%;width:130%;height:3px;background:linear-gradient(90deg,transparent,rgba(200,151,44,.8),transparent)}
.hero .badge{display:inline-block;background:var(--gold);color:#0f0f0f;font-size:.72rem;font-weight:800;padding:.3rem .9rem;border-radius:20px;letter-spacing:1px;text-transform:uppercase;margin-bottom:1rem}
.hero h1{color:#fff;font-size:clamp(1.5rem,4vw,2rem);font-weight:900;letter-spacing:-.5px;max-width:820px;margin:0 auto .8rem}
.hero h1 span{color:var(--red)}
.hero p{color:#9ca3af;max-width:680px;margin:0 auto;font-size:1rem}
.wrap{max-width:820px;margin:0 auto;padding:2.5rem 1.25rem 3.5rem}
.crumbs{font-size:.78rem;color:var(--muted);margin-bottom:1.5rem}
.crumbs a{color:var(--red);text-decoration:none}
article h2{font-size:1.4rem;font-weight:800;margin:2rem 0 .8rem;color:#0f0f0f;letter-spacing:-.3px}
article h3{font-size:1.08rem;font-weight:800;margin:1.5rem 0 .5rem;color:#111}
article p{margin-bottom:1rem;color:#374151}
article ul,article ol{margin:0 0 1rem 1.25rem;color:#374151}
article li{margin-bottom:.5rem}
.lead{font-size:1.08rem;color:#1f2937}
.callout{border-radius:12px;padding:1rem 1.25rem;margin:1.5rem 0;font-size:.92rem}
.callout.warn{background:#fef2f2;border:1px solid #fecaca;color:#7f1d1d}
.callout.tip{background:#f0fdf4;border:1px solid #bbf7d0;color:#14532d}
.callout.info{background:#eff6ff;border:1px solid #bfdbfe;color:#1e3a8a}
.dose-table,.cmp-table{width:100%;border-collapse:collapse;margin:1.25rem 0;font-size:.92rem;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.05)}
.dose-table th,.cmp-table th{background:#0f0f10;color:#fff;text-align:left;padding:.7rem .9rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.5px}
.dose-table td,.cmp-table td{padding:.7rem .9rem;border-bottom:1px solid #f1f5f9}
.faq details{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:.5rem 1rem;margin-bottom:.6rem}
.faq summary{font-weight:700;cursor:pointer;padding:.5rem 0;color:#111}
.faq p{margin:.4rem 0 .6rem}
.cta-box{background:linear-gradient(135deg,#0b0b0d,#171a22);border-radius:16px;padding:2rem;text-align:center;margin:2.5rem 0;border:1px solid rgba(200,151,44,.25)}
.cta-box h2{color:#fff;font-size:1.25rem;margin-bottom:.5rem}
.cta-box p{color:#9ca3af;margin-bottom:1.25rem;font-size:.92rem}
.cta-btn{display:inline-block;background:var(--red);color:#fff;padding:.85rem 1.75rem;border-radius:10px;font-weight:800;text-decoration:none;font-size:.95rem}
button.cta-btn{border:none;cursor:pointer;font-family:inherit;line-height:inherit}
.cta-btn:hover{background:var(--red-dark)}
.cta-btn.outline{background:transparent;border:2px solid var(--gold);color:var(--gold);margin-left:.5rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin:1.25rem 0}
.grid-card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:1.1rem}
.grid-card h3{font-size:.95rem;margin-bottom:.35rem}
.grid-card p{font-size:.85rem;color:#64748b;margin:0}
.product-hero{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center;margin:2rem 0;background:#fff;border-radius:16px;padding:1.5rem;border:1px solid #e5e7eb}
.product-hero img{width:100%;max-width:320px;margin:0 auto;display:block;border-radius:12px}
.product-price{font-size:2rem;font-weight:900;color:var(--red)}
.product-meta{color:#64748b;font-size:.85rem;margin:.5rem 0 1rem}
@media(max-width:700px){.product-hero{grid-template-columns:1fr;text-align:center}}

/* Numbered how-to steps (piston soak) */
.steps{counter-reset:step;margin:1.5rem 0}
.step{position:relative;background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:1.1rem 1.25rem 1.1rem 3.5rem;margin-bottom:.9rem;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.step::before{counter-increment:step;content:counter(step);position:absolute;left:1rem;top:1.1rem;width:1.9rem;height:1.9rem;background:var(--red);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.9rem}
.step strong{display:block;margin-bottom:.2rem;color:#0f0f0f}

/* Before / after comparison */
.ba-section{margin:2rem 0}
.ba-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:.75rem;
  margin:1rem 0;
  align-items:stretch;
}
.ba-card{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:14px;
  overflow:hidden;
  box-shadow:0 2px 8px rgba(0,0,0,.06);
  min-width:0;
}
.ba-card img{
  width:100%;
  height:auto;
  max-height:200px;
  aspect-ratio:4/3;
  object-fit:cover;
  object-position:center;
  display:block;
  background:#111;
}
.ba-label{padding:.5rem .7rem;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.4px;text-align:center}
.ba-before .ba-label{background:#1f2937;color:#fca5a5}
.ba-after .ba-label{background:#14532d;color:#86efac}
.ba-caption{font-size:.82rem;color:#6b7280;text-align:center;margin-top:.75rem;line-height:1.5}
@media(max-width:420px){
  .ba-grid{gap:.5rem}
  .ba-card img{max-height:140px}
  .ba-label{font-size:.62rem;padding:.4rem .45rem;letter-spacing:.2px}
}

/* Fuel-system cards / figure */
.card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:1.1rem 1.25rem;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.card .ic{font-size:1.5rem}
.card strong{display:block;margin:.4rem 0 .2rem;color:#0f0f0f}
.card p{font-size:.88rem;margin:0}
.product-figure{margin:1.75rem 0 2rem;background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:1rem;box-shadow:0 2px 8px rgba(0,0,0,.04);text-align:center}
.product-figure img{width:100%;max-width:720px;height:auto;border-radius:12px;display:block;margin:0 auto}
.product-figure figcaption{font-size:.78rem;color:var(--muted);margin-top:.75rem;line-height:1.5}