*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--ink:#1a2a3a;--muted:#4a6070;--teal:#2c5f7a;--teal-d:#1a4a60;--line:#dbe7ee;--bg:#f3f8fb}
body{font-family:'Inter',sans-serif;color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1140px;margin:0 auto;padding:0 1.5rem}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand-logo{display:block;width:104px;height:48px;background:url(/assets/logo.png) left center/contain no-repeat;text-indent:-9999px;overflow:hidden;white-space:nowrap}
.brand-logo small{display:none}
.hero-logo{display:block;width:min(340px,72%);height:auto;margin:0 auto}
.nav a{margin-left:1.6rem;font-size:.9rem;font-weight:500;color:var(--muted)}
.nav a:hover{color:var(--teal)}
/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#e8f4f8,#d6eef7 40%,#f0f7fa);padding:4.5rem 0 3.5rem;text-align:center}
.hero h1{font-size:3rem;font-weight:700;letter-spacing:.28em;text-transform:uppercase;text-indent:.28em}
.hero .sub{font-size:.95rem;font-weight:500;letter-spacing:.62em;text-indent:.62em;color:var(--teal);text-transform:uppercase;margin-top:.35rem}
.hero p{max-width:600px;margin:1.3rem auto 0;color:var(--muted);font-weight:300;font-size:1.08rem}
.bubble{position:absolute;border-radius:50%;background:radial-gradient(circle at 30% 30%,rgba(255,255,255,.8),rgba(255,255,255,.1));border:1px solid rgba(255,255,255,.4);animation:float linear infinite;pointer-events:none;bottom:-40px}
@keyframes float{0%{transform:translateY(0) scale(0);opacity:0}15%{opacity:.5}100%{transform:translateY(-340px) scale(1);opacity:0}}
/* section */
html{scroll-behavior:smooth}
#products{scroll-margin-top:88px}
.section{padding:3.5rem 0}
.section-head{text-align:center;margin-bottom:2.2rem}
.section-head h2{font-size:1.9rem;font-weight:700}
.section-head p{color:var(--muted);margin-top:.4rem}
/* product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1.4rem}
.card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(26,74,96,.13)}
.card .ph{background:linear-gradient(180deg,#f6fafc,#eef5f9);height:230px;display:flex;align-items:center;justify-content:center;padding:1rem}
.card .ph img{max-height:100%;max-width:100%;object-fit:contain}
.card .body{padding:1.1rem 1.2rem 1.3rem;border-top:1px solid var(--line)}
.card .body h3{font-size:1.15rem;font-weight:700}
.card .body span{display:block;color:var(--muted);font-size:.85rem;margin:.25rem 0 .8rem;min-height:2.2em}
.card .more{color:var(--teal);font-weight:600;font-size:.9rem}
/* detail */
.detail{display:grid;grid-template-columns:minmax(0,420px) 1fr;gap:2.5rem;padding:2.5rem 0 1rem;align-items:start}
.detail .img{background:linear-gradient(180deg,#f6fafc,#eef5f9);border:1px solid var(--line);border-radius:18px;padding:1.5rem;display:flex;align-items:center;justify-content:center;min-height:380px}
.detail .img img{max-width:100%;max-height:560px;object-fit:contain}
.detail h1{font-size:2.2rem;font-weight:700}
.detail .type{color:var(--teal);font-weight:600;letter-spacing:.04em;margin:.3rem 0 1.1rem}
.detail .desc{color:var(--muted);margin-bottom:1.6rem}
.spec{width:100%;border-collapse:collapse;font-size:.92rem}
.spec th{text-align:left;background:var(--bg);color:var(--ink);font-weight:600;padding:.6rem .8rem;border:1px solid var(--line);width:45%}
.spec td{padding:.6rem .8rem;border:1px solid var(--line);color:var(--muted)}
.cta{display:inline-flex;align-items:center;gap:.6rem;margin-top:1.8rem;background:linear-gradient(135deg,var(--teal),var(--teal-d));color:#fff;padding:.9rem 1.6rem;border-radius:12px;font-weight:600;box-shadow:0 4px 15px rgba(44,95,122,.3)}
.cta:hover{transform:translateY(-2px)}
.back{display:inline-block;color:var(--muted);font-size:.9rem;margin-top:2rem}
.back:hover{color:var(--teal)}
/* footer */
.footer{background:#1a2a3a;color:rgba(255,255,255,.55);text-align:center;padding:2.5rem 1rem;margin-top:3rem}
.footer .fl{font-weight:700;letter-spacing:.15em;color:rgba(255,255,255,.75);text-transform:uppercase;margin-bottom:.5rem}
.footer p{font-size:.8rem}
@media(max-width:760px){.detail{grid-template-columns:1fr}.hero h1{font-size:2.2rem}}