/* =========================================================================
   carseatholder.com — "garage-clean" design system
   Midnight navy + steel + amber. Space Grotesk display, Inter body.
   ========================================================================= */
:root{
  --navy:#15233b; --navy-2:#22324d; --steel:#34466a;
  --paper:#f4f6fa; --panel:#eef1f6; --line:#d7deea;
  --ink:#15233b; --ink-soft:#5b6473;
  --amber:#e0902b; --amber-dk:#b9711d;
  --radius:14px; --maxw:1120px;
  --shadow:0 1px 2px rgba(21,35,59,.05),0 10px 30px rgba(21,35,59,.08);
  --disp:"Space Grotesk",system-ui,sans-serif; --body:"Inter",system-ui,sans-serif; --mono:"IBM Plex Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--disp);font-weight:700;line-height:1.12;letter-spacing:-.01em;margin:0}
a{color:inherit}
.skip{position:absolute;left:-9999px;background:var(--navy);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:0}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* header */
.site-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;max-width:var(--maxw);margin:0 auto;padding:1rem 1.25rem}
.logo-svg{height:34px;width:auto;display:block}
.site-nav{display:flex;gap:1.4rem}
.site-nav a{text-decoration:none;color:var(--ink-soft);font-weight:600;font-size:.95rem}
.site-nav a:hover{color:var(--amber-dk)}

/* hero */
.hero{max-width:var(--maxw);margin:0 auto;padding:2.4rem 1.25rem 1rem;display:grid;grid-template-columns:1.05fr .95fr;gap:2rem;align-items:center}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--amber-dk);margin:0 0 1rem}
.hero h1{font-size:clamp(2.3rem,5.2vw,3.7rem)}
.hero h1 .accent{color:var(--amber)}
.lede{font-size:1.12rem;color:var(--ink-soft);max-width:46ch;margin:1rem 0 1.6rem}
.hero-actions{display:flex;gap:.8rem;flex-wrap:wrap}
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;font-weight:600;padding:.85rem 1.6rem;border-radius:100px;transition:transform .15s,background .15s}
.btn:hover{background:var(--steel);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--navy);border:1.5px solid var(--line)}
.btn.ghost:hover{border-color:var(--navy);background:transparent}
.hero-art{display:flex;justify-content:center}
.hero-art svg{max-width:100%;height:auto;border-radius:var(--radius);box-shadow:var(--shadow)}

/* ad rails (chrome only) */
.ad-rail{max-width:var(--maxw);margin:1.5rem auto;padding:0 1.25rem}
.ad-rail:empty{margin:0}

/* section heads */
.sec-h{font-family:var(--disp);font-size:clamp(1.6rem,3.6vw,2.2rem);text-align:center;margin:0 0 .4rem}
.sec-sub{text-align:center;color:var(--ink-soft);max-width:54ch;margin:0 auto 1.6rem}

/* category cards */
.cats{max-width:var(--maxw);margin:2.6rem auto 0;padding:0 1.25rem}
.cats .sec-h{margin-bottom:1.4rem}
.cats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.1rem}
.cat-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.cat-card:hover{transform:translateY(-3px);border-color:var(--amber)}
.cat-art{background:var(--panel);padding:1.1rem;display:flex;justify-content:center;border-bottom:1px solid var(--line)}
.cat-art svg{max-width:100%;height:auto;max-height:150px}
.cat-card h3{font-size:1.2rem;margin:1rem 1.1rem .3rem}
.cat-card p{color:var(--ink-soft);font-size:.95rem;margin:0 1.1rem .8rem}
.cat-card .go{color:var(--amber-dk);font-weight:600;font-size:.9rem;margin:0 1.1rem 1.1rem}

/* picks (product cards) */
.picks{max-width:var(--maxw);margin:3rem auto 0;padding:0 1.25rem}
.picks-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-top:1.4rem}
.product-card{display:flex;gap:1rem;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem;box-shadow:var(--shadow);align-items:flex-start}
.pc-ico{flex:0 0 auto}
.pc-ico svg{width:72px;height:72px;border-radius:12px}
.pc-body h4{font-family:var(--disp);font-size:1.02rem;margin:0 0 .3rem}
.pc-body p{font-size:.9rem;color:var(--ink-soft);margin:0 0 .7rem}
.pc-cta{display:inline-block;background:var(--amber);color:#fff;text-decoration:none;font-weight:600;font-size:.88rem;padding:.55rem 1rem;border-radius:100px;transition:background .15s}
.pc-cta:hover{background:var(--amber-dk)}
.aff-note{text-align:center;font-size:.82rem;color:var(--ink-soft);margin-top:1.1rem}
.aff-note a{color:var(--amber-dk)}

/* in-prose product card spans full width */
.prose .product-card{margin:1.4rem 0}

/* faq */
.faq{max-width:760px;margin:3rem auto 1rem;padding:0 1.25rem}
.faq .sec-h{margin-bottom:1.2rem}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:.5rem 1.1rem;margin-bottom:.7rem}
.faq-item summary{cursor:pointer;font-weight:600;font-family:var(--disp);padding:.6rem 0;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"+ ";color:var(--amber-dk);font-weight:700}
.faq-item[open] summary::before{content:"– "}
.faq-item p{color:var(--ink-soft);margin:.2rem 0 .8rem}

/* breadcrumbs + article */
.crumbs{font-size:.8rem;color:var(--ink-soft);margin-bottom:1.1rem}
.crumbs a{color:var(--amber-dk);text-decoration:none}
.article{max-width:760px;margin:2rem auto 0;padding:0 1.25rem}
.art-head h1{font-size:clamp(1.9rem,5vw,2.9rem);margin:.4rem 0 .7rem}
.art-desc{font-size:1.1rem;color:var(--ink-soft);margin:0}
.art-cover{margin:1.6rem 0 1.3rem;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem;display:flex;justify-content:center;overflow:hidden}
.art-cover svg{max-width:100%;height:auto}
.cover-art{display:flex;justify-content:center;align-items:center;width:100%}
.cover-icon{display:flex;justify-content:center;padding:1rem}

/* prose */
.prose{font-size:1.08rem;line-height:1.72}
.prose h2{font-size:clamp(1.5rem,3.4vw,2rem);margin:2.1rem 0 .7rem}
.prose h3{font-size:1.2rem;margin:1.5rem 0 .4rem}
.prose p{margin:0 0 1.1rem;color:#2a3447}
.prose ul{margin:0 0 1.2rem;padding-left:1.2rem}
.prose li{margin:.4rem 0}
.prose strong{color:var(--ink)}
.prose em{color:var(--amber-dk);font-style:normal;font-weight:600}
.prose .fig{margin:1.6rem 0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;display:flex;justify-content:center;overflow:hidden}
.prose .fig svg{max-width:100%;height:auto}

/* in-article CTA */
.cta-card{margin:2.2rem 0;padding:1.6rem;background:linear-gradient(180deg,#fbf6ee,var(--panel));border:1px solid var(--amber);border-radius:var(--radius);text-align:center}
.cta-card h3{font-size:1.3rem;margin-bottom:.5rem}
.cta-card p{color:var(--ink-soft);max-width:48ch;margin:0 auto 1.1rem}

/* related */
.related{margin:2.6rem 0 1rem;border-top:1px solid var(--line);padding-top:1.6rem}
.related h2{font-size:1.3rem;margin-bottom:1rem}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.9rem}
.related-card{display:flex;flex-direction:column;gap:.5rem;text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:.8rem;background:#fff;font-weight:600;font-size:.9rem;line-height:1.3;transition:border-color .15s,transform .15s}
.related-card:hover{border-color:var(--amber);transform:translateY(-2px)}
.related-card svg{max-width:100%;height:70px}

/* hub */
.hub{max-width:var(--maxw);margin:2rem auto 0;padding:0 1.25rem}
.hub h1{font-size:clamp(2rem,5vw,3.2rem);margin:.3rem 0 .5rem}
.hub-lede{font-size:1.1rem;color:var(--ink-soft);max-width:58ch;margin:0 0 1.8rem}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.1rem}
.hub-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.hub-card:hover{transform:translateY(-3px);border-color:var(--amber)}
.hub-art{background:var(--panel);padding:1.1rem;display:flex;justify-content:center;border-bottom:1px solid var(--line);min-height:120px;align-items:center}
.hub-art svg{max-width:100%;height:auto;max-height:130px}
.step-tag{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--amber-dk)}
.hub-meta{padding:1.1rem}
.hub-meta h2{font-size:1.18rem;margin:.4rem 0 .5rem;line-height:1.2}
.hub-meta p{font-size:.92rem;color:var(--ink-soft);margin:0 0 .7rem}
.hub-meta .go{color:var(--amber-dk);font-weight:600;font-size:.9rem}

/* legal */
.legal .prose{font-size:1rem}
.legal h2{font-size:1.25rem}

/* footer */
.site-foot{max-width:var(--maxw);margin:3rem auto 0;padding:2.4rem 1.25rem 3rem}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:1.5rem;border-top:1px solid var(--line);padding-top:2rem}
.site-foot h4{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 .7rem}
.site-foot nav{display:flex;flex-direction:column;gap:.45rem}
.site-foot nav a{color:var(--ink-soft);text-decoration:none;font-size:.92rem}
.site-foot nav a:hover{color:var(--amber-dk)}
.foot-about p{color:var(--ink-soft);font-size:.9rem;max-width:36ch;margin:.6rem 0 0}
.foot-fine{font-size:.76rem;color:var(--ink-soft);margin-top:1.6rem;line-height:1.5}

/* scroll-to-top */
.to-top{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;border:none;background:var(--navy);color:#fff;font-size:1.2rem;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .2s,transform .2s,background .15s;z-index:50;box-shadow:var(--shadow)}
.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{background:var(--amber-dk)}

/* responsive */
@media(max-width:880px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){
  .hero{grid-template-columns:1fr;padding-top:1.6rem}
  .hero-art{order:-1}
  .site-nav{gap:.9rem;font-size:.86rem}
  .article{margin-top:1.4rem}
  .prose{font-size:1.04rem}
}
@media(max-width:560px){
  .site-head{flex-wrap:wrap;gap:.5rem;padding:.85rem 1rem}
  .site-nav{width:100%;justify-content:space-between;gap:.5rem;font-size:.8rem;flex-wrap:wrap}
  .foot-grid{grid-template-columns:1fr}
  .product-card{flex-direction:column}
  .pc-ico svg{width:60px;height:60px}
  .to-top{right:12px;bottom:12px;width:42px;height:42px}
}