*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--c-primary:#E65100;--c-primary-dark:#BF360C;
--c-dark:#1a1a1a;--c-charcoal:#2d2d2d;--c-steel:#3a3a3a;
--c-text:#e0e0e0;--c-muted:#9e9e9e;--c-white:#ffffff;--c-bg:#111111;
--font-body:'Segoe UI',system-ui,-apple-system,sans-serif;
--max-w:1200px;--radius:10px;
}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--c-bg);color:var(--c-text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--c-white)}

/* NAV */
.nav{background:var(--c-dark);border-bottom:1px solid var(--c-steel);position:sticky;top:0;z-index:100;backdrop-filter:blur(12px)}
.nav-inner{max-width:var(--max-w);margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:1.35rem;font-weight:800;color:var(--c-white);display:flex;align-items:center;gap:.5rem}
.logo-icon{color:var(--c-primary);font-size:1.5rem}
.nav-links{list-style:none;display:flex;gap:2rem;align-items:center}
.nav-links a{color:var(--c-text);font-weight:500;font-size:.95rem;padding:.5rem 0}
.nav-links a:hover{color:var(--c-primary)}
.nav-toggle-input{display:none}
.nav-toggle-label{display:none;cursor:pointer;flex-direction:column;gap:5px}
.nav-toggle-label span{display:block;width:24px;height:2px;background:var(--c-white);transition:.3s}
.nav-dropdown{position:relative}
.dropdown-menu{display:none;position:absolute;top:100%;left:0;background:var(--c-charcoal);border:1px solid var(--c-steel);border-radius:var(--radius);padding:.75rem 0;min-width:220px;box-shadow:0 12px 32px rgba(0,0,0,.5)}
.dropdown-menu li{list-style:none}
.dropdown-menu a{display:block;padding:.5rem 1.25rem;font-size:.9rem}
.dropdown-menu a:hover{background:rgba(230,81,0,.1)}
.nav-dropdown:hover .dropdown-menu{display:block}
.dropdown-arrow{font-size:.7rem;opacity:.6}

@media(max-width:768px){
.nav-toggle-label{display:flex}
.nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--c-dark);flex-direction:column;padding:1rem 1.5rem;gap:0;border-bottom:1px solid var(--c-steel)}
.nav-links li{padding:.5rem 0}
.nav-toggle-input:checked~.nav-links{display:flex}
.dropdown-menu{position:static;border:none;box-shadow:none;padding-left:1rem}
.nav-dropdown:hover .dropdown-menu{display:none}
.nav-dropdown .dropdown-menu{display:none}
.nav-toggle-input:checked~.nav-links .dropdown-menu{display:block}
}

/* HERO */
.hero{position:relative;height:520px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.35)}
.hero-content{position:relative;z-index:2;max-width:800px;padding:2rem}
.hero h1{font-size:3rem;font-weight:900;color:var(--c-white);margin-bottom:.75rem;line-height:1.1}
.hero h1 span{color:var(--c-primary)}
.hero p{font-size:1.2rem;color:var(--c-muted);margin-bottom:2rem;max-width:600px;margin-left:auto;margin-right:auto}
.hero-cta{display:inline-flex;align-items:center;gap:.5rem;background:var(--c-primary);color:var(--c-white);padding:.9rem 2rem;border-radius:50px;font-weight:700;font-size:1rem;transition:background .2s,transform .2s;text-transform:uppercase;letter-spacing:.5px}
.hero-cta:hover{background:var(--c-primary-dark);color:var(--c-white);transform:translateY(-2px)}

/* SECTION */
.section{max-width:var(--max-w);margin:0 auto;padding:4rem 1.5rem}
.section-header{text-align:center;margin-bottom:3rem}
.section-header h2{font-size:2.2rem;font-weight:800;color:var(--c-white);margin-bottom:.5rem}
.section-header p{color:var(--c-muted);font-size:1.05rem;max-width:650px;margin:0 auto}
.section-label{display:inline-block;background:rgba(230,81,0,.15);color:var(--c-primary);padding:.25rem .85rem;border-radius:50px;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:1rem}

/* CATEGORY GRID */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}
.cat-card{background:var(--c-charcoal);border-radius:var(--radius);overflow:hidden;border:1px solid var(--c-steel);transition:transform .25s,box-shadow .25s}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(230,81,0,.15)}
.cat-card-img{height:200px;overflow:hidden}
.cat-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.cat-card:hover .cat-card-img img{transform:scale(1.05)}
.cat-card-body{padding:1.5rem}
.cat-card-body h3{font-size:1.25rem;font-weight:700;color:var(--c-white);margin-bottom:.5rem}
.cat-card-body p{color:var(--c-muted);font-size:.9rem;margin-bottom:1rem;line-height:1.6}

/* CATEGORY DETAIL SECTION */
.cat-detail{padding:4rem 0;border-bottom:1px solid var(--c-steel)}
.cat-detail:last-of-type{border-bottom:none}
.cat-detail-inner{max-width:var(--max-w);margin:0 auto;padding:0 1.5rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.cat-detail:nth-child(even) .cat-detail-inner{direction:rtl}
.cat-detail:nth-child(even) .cat-detail-inner>*{direction:ltr}
.cat-detail-img{border-radius:var(--radius);overflow:hidden;border:1px solid var(--c-steel)}
.cat-detail-img img{width:100%;height:auto;display:block}
.cat-detail-content h2{font-size:1.8rem;font-weight:800;color:var(--c-white);margin-bottom:.75rem}
.cat-detail-content>p{color:var(--c-muted);margin-bottom:1.25rem;line-height:1.7}
.parts-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:.4rem .75rem;margin-bottom:1.5rem}
.parts-list li{color:var(--c-text);font-size:.9rem;padding:.3rem 0;padding-left:1.2rem;position:relative}
.parts-list li::before{content:"\2713";position:absolute;left:0;color:var(--c-primary);font-weight:700}
.cat-links{display:flex;gap:.75rem;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem 1.25rem;border-radius:var(--radius);font-weight:600;font-size:.88rem;transition:all .2s}
.btn-amazon{background:#FF9900;color:#111}
.btn-amazon:hover{background:#e68a00;color:#111;transform:translateY(-1px)}
.btn-ebay{background:#0064D2;color:var(--c-white)}
.btn-ebay:hover{background:#0050a8;color:var(--c-white);transform:translateY(-1px)}

@media(max-width:768px){
.cat-detail-inner{grid-template-columns:1fr;gap:1.5rem}
.cat-detail:nth-child(even) .cat-detail-inner{direction:ltr}
.hero h1{font-size:2rem}
.hero{height:400px}
.parts-list{grid-template-columns:1fr}
}

/* DETAIL SHOWCASE */
.showcase{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}
.showcase-item{border-radius:var(--radius);overflow:hidden;position:relative;border:1px solid var(--c-steel)}
.showcase-item img{width:100%;aspect-ratio:1;object-fit:cover;transition:transform .4s}
.showcase-item:hover img{transform:scale(1.06)}
.showcase-caption{position:absolute;bottom:0;left:0;right:0;padding:.75rem 1rem;background:linear-gradient(transparent,rgba(0,0,0,.85));color:var(--c-white);font-size:.85rem;font-weight:600}
@media(max-width:768px){.showcase{grid-template-columns:1fr 1fr}}

/* CROSSLINKS */
.crosslink-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem}
.crosslink-card{background:var(--c-charcoal);border:1px solid var(--c-steel);border-radius:var(--radius);padding:1.5rem;transition:border-color .2s}
.crosslink-card:hover{border-color:var(--c-primary)}
.crosslink-card h3{color:var(--c-white);font-size:1.1rem;margin-bottom:.5rem}
.crosslink-card p{color:var(--c-muted);font-size:.88rem}

/* PAGE HERO (about, contact, etc) */
.page-hero{position:relative;height:300px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.page-hero .hero-bg{filter:brightness(.25)}
.page-hero h1{position:relative;z-index:2;font-size:2.5rem;font-weight:900;color:var(--c-white)}
.page-hero p{position:relative;z-index:2;color:var(--c-muted);font-size:1.1rem;margin-top:.5rem;max-width:550px}

/* CONTENT PAGE */
.content-page{max-width:800px;margin:0 auto;padding:3rem 1.5rem}
.content-page h2{color:var(--c-white);font-size:1.5rem;margin:2rem 0 .75rem;font-weight:700}
.content-page h3{color:var(--c-white);font-size:1.15rem;margin:1.5rem 0 .5rem;font-weight:600}
.content-page p{margin-bottom:1rem;color:var(--c-text);line-height:1.8}
.content-page ul{margin:0 0 1rem 1.5rem;color:var(--c-text)}
.content-page li{margin-bottom:.35rem}
.content-page a{color:var(--c-primary)}

/* CONTACT FORM */
.contact-form{max-width:600px;margin:0 auto}
.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-weight:600;color:var(--c-white);margin-bottom:.4rem;font-size:.95rem}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:.75rem 1rem;background:var(--c-charcoal);border:1px solid var(--c-steel);border-radius:var(--radius);color:var(--c-text);font-family:inherit;font-size:.95rem;transition:border-color .2s}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:none;border-color:var(--c-primary)}
.form-group textarea{resize:vertical;min-height:140px}
.form-submit{background:var(--c-primary);color:var(--c-white);border:none;padding:.8rem 2.5rem;border-radius:50px;font-weight:700;font-size:1rem;cursor:pointer;transition:background .2s}
.form-submit:hover{background:var(--c-primary-dark)}

/* 404 */
.error-page{text-align:center;padding:6rem 1.5rem}
.error-page h1{font-size:7rem;font-weight:900;color:var(--c-primary);line-height:1}
.error-page h2{font-size:1.5rem;color:var(--c-white);margin:.5rem 0 1rem}
.error-page p{color:var(--c-muted);margin-bottom:2rem}

/* FOOTER */
.footer{background:var(--c-dark);border-top:1px solid var(--c-steel);margin-top:4rem}
.footer-inner{max-width:var(--max-w);margin:0 auto;padding:3rem 1.5rem 1.5rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2rem;margin-bottom:2rem}
.footer h4{color:var(--c-white);font-size:1rem;margin-bottom:.75rem}
.footer p{color:var(--c-muted);font-size:.88rem;line-height:1.6}
.footer-links{display:flex;flex-direction:column;gap:.3rem}
.footer-links a{color:var(--c-muted);font-size:.88rem}
.footer-links a:hover{color:var(--c-primary)}
.footer-disclosure{border-top:1px solid var(--c-steel);padding-top:1.25rem;margin-bottom:1.25rem}
.footer-disclosure p{color:var(--c-muted);font-size:.82rem;line-height:1.7}
.footer-bottom{text-align:center;padding-top:1rem;border-top:1px solid var(--c-steel)}
.footer-bottom p{color:var(--c-muted);font-size:.82rem}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr;gap:1.5rem}}