:root{--ktp-blue:#0d6efd;--ktp-dark:#101828;--ktp-muted:#667085;--ktp-light:#f5f8ff;}
*{box-sizing:border-box} body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ktp-dark);background:#fff;line-height:1.55} a{text-decoration:none;color:inherit}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.topbar{background:#07142f;color:#fff;font-size:14px;padding:8px 0}.topbar .container,.site-header .container{display:flex;justify-content:space-between;align-items:center;gap:20px}.site-header{background:#fff;border-bottom:1px solid #e6eaf2;position:sticky;top:0;z-index:20}.logo{display:flex;align-items:center;gap:12px;padding:12px 0;font-weight:700}.logo img{max-height:52px;max-width:180px}.nav{display:flex;gap:24px;align-items:center}.nav a{font-weight:600;color:#1d2939}.nav a:hover,.nav a.active{color:var(--ktp-blue)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 18px;border-radius:8px;border:1px solid var(--ktp-blue);background:var(--ktp-blue);color:#fff;font-weight:700}.btn-outline{background:#fff;color:var(--ktp-blue)}.hero{background:linear-gradient(135deg,#07142f,#0b4fb3);color:#fff;padding:72px 0}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}.hero h1{font-size:44px;line-height:1.15;margin:0 0 16px}.hero p{font-size:18px;color:#e6efff;margin:0 0 24px}.hero img{width:100%;border-radius:18px;box-shadow:0 18px 50px rgba(0,0,0,.25)}.section{padding:54px 0}.section-title{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:24px}.section-title h2{font-size:30px;margin:0}.section-title p{margin:6px 0 0;color:var(--ktp-muted)}.grid{display:grid;gap:22px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.card{border:1px solid #e6eaf2;border-radius:14px;background:#fff;overflow:hidden;transition:.2s}.card:hover{box-shadow:0 12px 32px rgba(16,24,40,.1);transform:translateY(-2px)}.card-img{height:190px;background:#f2f4f7;display:flex;align-items:center;justify-content:center}.card-img img{width:100%;height:100%;object-fit:cover}.card-body{padding:18px}.card h3{margin:0 0 8px;font-size:19px}.card p{margin:0;color:var(--ktp-muted)}.badge{display:inline-block;background:#eef4ff;color:#175cd3;border-radius:20px;padding:4px 10px;font-size:13px;margin-bottom:10px}.product-list{display:grid;grid-template-columns:260px 1fr;gap:28px}.filter-box{border:1px solid #e6eaf2;border-radius:14px;padding:18px;align-self:start}.filter-box a{display:block;padding:8px 0;color:#344054}.filter-box a.active{color:var(--ktp-blue);font-weight:700}.product-detail{display:grid;grid-template-columns:.9fr 1.1fr;gap:34px}.product-main-img{border:1px solid #e6eaf2;border-radius:16px;background:#f8fafc;overflow:hidden}.product-main-img img{width:100%;display:block}.spec-box{background:#f8fafc;border:1px solid #e6eaf2;border-radius:14px;padding:20px;white-space:pre-wrap}.contact-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:30px}.form-control{width:100%;padding:12px;border:1px solid #d0d5dd;border-radius:8px;margin-bottom:12px;font:inherit}.site-footer{background:#07142f;color:#d7e3ff;padding:42px 0 20px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:28px}.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;color:#98a2b3}.alert{padding:12px 14px;border-radius:10px;margin-bottom:16px}.alert-success{background:#ecfdf3;color:#027a48}.alert-danger{background:#fef3f2;color:#b42318}@media(max-width:900px){.hero-grid,.product-list,.product-detail,.contact-wrap,.footer-grid{grid-template-columns:1fr}.grid-3,.grid-4{grid-template-columns:1fr 1fr}.nav{display:none}.hero h1{font-size:34px}}@media(max-width:560px){.grid-3,.grid-4{grid-template-columns:1fr}.topbar .container{display:block}.hero{padding:48px 0}}