:root{
  --primary:#0b6fa4; --primary-dark:#08527a; --accent:#f39c12;
  --dark:#12222e; --gray:#f5f7fa; --text:#333; --radius:10px;
  --shadow:0 4px 18px rgba(0,0,0,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.65;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
h1,h2,h3{color:var(--dark);line-height:1.25}
h1{font-size:2.2rem;margin-bottom:.8rem}
h2{font-size:1.6rem}
h3{font-size:1.15rem}

/* header */
.site-header{background:#fff;box-shadow:var(--shadow);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.6rem 20px;gap:1rem}
.logo img{height:52px;width:auto}
.menu-toggle{display:none;font-size:1.6rem;background:none;border:none;cursor:pointer;color:var(--dark)}
.main-nav ul{display:flex;list-style:none;gap:1.4rem}
.main-nav a{color:var(--dark);font-weight:600;padding:.5rem 0}
.main-nav a.active,.main-nav a:hover{color:var(--primary);text-decoration:none;border-bottom:2px solid var(--primary)}

/* hero */
.hero{position:relative}
.hero-img{width:100%;height:auto;object-fit:cover;max-height:500px}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;background:linear-gradient(90deg,rgba(8,40,60,.75),rgba(8,40,60,.25));color:#fff;padding:0 20px}
.hero-overlay h1{color:#fff;font-size:2.6rem;max-width:760px}
.hero-overlay p{max-width:640px;margin:.8rem 0 1.4rem;font-size:1.1rem}

/* buttons */
.btn{display:inline-block;padding:.75rem 1.6rem;border-radius:var(--radius);font-weight:700;transition:.2s;margin:.3rem .5rem .3rem 0}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-light{background:var(--accent);color:#fff}
.btn-outline{border:2px solid #fff;color:#fff}
.btn-outline:hover{background:#fff;color:var(--primary)}
.btn-secondary{background:#eef4f8;color:var(--primary);font-size:.9rem;padding:.5rem 1.1rem}

/* sections */
.section{padding:3.5rem 0}
.section.alt{background:var(--gray)}
.section-title{text-align:center;margin-bottom:2rem;position:relative}
.section-title::after{content:"";display:block;width:60px;height:4px;background:var(--accent);margin:.6rem auto 0;border-radius:2px}
.grid{display:grid;gap:1.5rem}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:1.6rem;transition:.2s}
.card:hover{transform:translateY(-4px)}
.card h3{margin-bottom:.5rem}
.spec-badge{display:inline-block;background:#eef4f8;color:var(--primary);font-weight:700;padding:.25rem .8rem;border-radius:20px;font-size:.85rem}
.split{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;align-items:center}
.case-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.case-card img{aspect-ratio:4/3;object-fit:cover;width:100%}
.case-card figcaption{padding:.8rem 1rem;font-weight:600;color:var(--dark)}

/* product cards */
.product-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;padding-bottom:1.2rem}
.product-card img{aspect-ratio:1/1;object-fit:cover;width:100%}
.product-card h3{padding:.9rem 1.2rem 0}
.product-card p{padding:.4rem 1.2rem;font-size:.92rem;flex:1}
.product-card .btn{margin:.4rem 1.2rem 0;align-self:flex-start}

/* product detail */
.detail img{border-radius:var(--radius);box-shadow:var(--shadow)}
.feature-list{margin:1.2rem 0 1.5rem 1.2rem}
.feature-list li{margin-bottom:.6rem}

/* breadcrumb */
.breadcrumb{padding:1rem 0;font-size:.9rem}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:.4rem;color:#999}

/* cta band */
.cta-band{background:linear-gradient(90deg,var(--primary-dark),var(--primary));color:#fff;padding:2.6rem 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}
.cta-band h2{color:#fff}
.cta-band p{opacity:.9}

/* faq */
.faq-item{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:1.2rem 1.5rem;margin-bottom:1rem}
.faq-item h3{margin-bottom:.4rem;font-size:1.05rem}

/* contact form */
.contact-form{display:flex;flex-direction:column;gap:.6rem;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:1.8rem}
.contact-form label{font-weight:600;font-size:.9rem}
.contact-form input,.contact-form select,.contact-form textarea{padding:.7rem;border:1px solid #ccd6de;border-radius:6px;font-size:1rem;font-family:inherit;width:100%}
.contact-form input:focus,.contact-form textarea:focus,.contact-form select:focus{outline:2px solid var(--primary);border-color:transparent}
.contact-form .btn{margin-top:.6rem;align-self:flex-start}

/* footer */
.site-footer{background:var(--dark);color:#cfd8de;padding:3rem 0 0;font-size:.95rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.5fr;gap:2.5rem}
.site-footer h3{color:#fff;margin-bottom:.8rem;font-size:1.05rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:.4rem}
.site-footer a{color:#cfd8de}
.site-footer a:hover{color:#fff}
.footer-cta{color:var(--accent)!important;font-weight:700}
.site-footer img{height:46px;width:auto;margin-bottom:.8rem}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:2.5rem;padding:1.2rem 20px;text-align:center;font-size:.85rem}

/* responsive */
@media(max-width:992px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero-overlay h1{font-size:2rem}
}
@media(max-width:700px){
  .menu-toggle{display:block}
  .main-nav{display:none;width:100%}
  .main-nav.open{display:block}
  .header-inner{flex-wrap:wrap}
  .main-nav ul{flex-direction:column;width:100%;gap:0}
  .main-nav a{display:block;padding:.8rem 0;border-bottom:1px solid #eee}
  .grid,.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .hero-overlay{position:static;background:var(--dark);padding:2rem 20px}
  .hero-img{max-height:260px;object-fit:cover}
  h1{font-size:1.7rem}
}