:root{
  --blue:#0d5cab; --blue-d:#0a4a8a; --blue-dd:#083a6e;
  --orange:#f5871f; --orange-d:#e07512;
  --ink:#1c2733; --muted:#5b6b7c; --bg:#f5f8fb; --card:#ffffff;
  --line:#e3eaf1; --radius:14px;
  --shadow:0 6px 24px rgba(13,92,171,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
section{padding:72px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 44px}
.sec-head h2{font-size:clamp(26px,3.2vw,36px);color:var(--blue-dd);margin-bottom:10px}
.sec-head p{color:var(--muted)}
.eyebrow{display:inline-block;background:rgba(245,135,31,.12);color:var(--orange-d);font-weight:700;font-size:13px;letter-spacing:2px;text-transform:uppercase;padding:4px 14px;border-radius:999px;margin-bottom:12px}

/* header */
header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.08)}
.topbar{background:var(--blue-dd);color:#dbe8f5;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;min-height:34px;gap:12px;flex-wrap:wrap}
.topbar a{color:#fff;font-weight:600}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0}
.brand{display:flex;align-items:center;gap:12px}
.brand .logo{width:46px;height:46px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--blue-d));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;letter-spacing:.5px}
.brand b{font-size:18px;color:var(--blue-dd);display:block;line-height:1.2}
.brand span{font-size:12px;color:var(--muted)}
nav.links{display:flex;gap:22px;flex-wrap:wrap}
nav.links a{color:var(--ink);font-weight:600;font-size:15px}
nav.links a:hover{color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:10px}
.lang-btn{border:1.5px solid var(--blue);color:var(--blue);background:#fff;font-weight:700;border-radius:999px;padding:7px 16px;cursor:pointer;font-size:14px}
.lang-btn:hover{background:var(--blue);color:#fff}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:11px 22px;font-weight:700;font-size:15px;cursor:pointer;border:none;transition:.2s}
.btn-wa{background:#25d366;color:#fff}
.btn-wa:hover{background:#1fb457}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-d)}
.btn-orange{background:var(--orange);color:#fff}
.btn-orange:hover{background:var(--orange-d)}
.btn-ghost{border:2px solid #fff;color:#fff;background:transparent}
.btn-ghost:hover{background:#fff;color:var(--blue-d)}

/* hero */
.hero{background:linear-gradient(120deg,var(--blue-dd) 0%,var(--blue) 55%,#2b86d6 100%);color:#fff;padding:0;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding-top:64px;padding-bottom:64px}
.hero h1{font-size:clamp(28px,4vw,44px);line-height:1.25;margin-bottom:16px}
.hero h1 em{color:#ffc98a;font-style:normal}
.hero p.sub{font-size:17px;color:#dcebfa;margin-bottom:26px;max-width:560px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap}
.hero-badges span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:999px;font-size:13px}
.hero-img{border-radius:16px;box-shadow:0 20px 50px rgba(0,0,0,.35);transform:rotate(1.5deg)}
.stats{background:#fff;border-bottom:1px solid var(--line)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:26px 20px}
.stat b{font-size:26px;color:var(--blue);display:block}
.stat span{color:var(--muted);font-size:13.5px}

/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;cursor:pointer;transition:.2s}
.cat-card:hover{border-color:var(--blue);box-shadow:var(--shadow);transform:translateY(-3px)}
.cat-card .num{font-size:12px;font-weight:800;color:var(--orange-d)}
.cat-card h3{font-size:17px;margin:6px 0 4px;color:var(--blue-dd)}
.cat-card p{font-size:13px;color:var(--muted)}
.cat-card .cnt{margin-top:10px;font-size:13px;color:var(--blue);font-weight:700}

/* featured */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:20px}
.p-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.p-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.p-card .imgbox{background:#f2f5f8;padding:14px;aspect-ratio:1.15;display:flex;align-items:center;justify-content:center}
.p-card img{max-height:100%;object-fit:contain}
.p-card .body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.p-card .code{font-size:12px;font-weight:800;color:var(--orange-d);letter-spacing:1px}
.p-card h4{font-size:15px;line-height:1.35;color:var(--ink)}
.p-card .alt{font-size:12.5px;color:var(--muted)}
.p-card .wa{margin-top:auto;padding-top:8px}
.p-card .wa a{font-size:13px;font-weight:700;color:#128c4b;display:inline-flex;align-items:center;gap:6px}

/* catalog */
.catalog{background:#fff}
.tools{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-bottom:22px}
.tools input[type=search]{flex:1;min-width:220px;border:1.5px solid var(--line);border-radius:999px;padding:11px 18px;font-size:15px;outline:none}
.tools input[type=search]:focus{border-color:var(--blue)}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:8px 16px;font-size:13.5px;font-weight:600;cursor:pointer;color:var(--muted)}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.chip .n{opacity:.75;font-size:12px}
.pl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:12px}
.pl-item{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:var(--bg);display:flex;justify-content:space-between;gap:10px;align-items:center}
.pl-item .t b{display:block;font-size:14px;color:var(--ink)}
.pl-item .t span{font-size:12.5px;color:var(--muted)}
.pl-item .code{font-size:11.5px;font-weight:800;color:var(--blue);background:rgba(13,92,171,.08);padding:3px 8px;border-radius:6px;white-space:nowrap}
.pl-item .ask{font-size:12px;font-weight:700;color:#128c4b;white-space:nowrap}
.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:40px 0}

/* advantages */
.adv-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.adv{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.adv .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--blue),#2b86d6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:12px}
.adv h3{font-size:16.5px;margin-bottom:6px;color:var(--blue-dd)}
.adv p{font-size:14px;color:var(--muted)}
.apps{margin-top:36px;background:linear-gradient(90deg,var(--blue-dd),var(--blue));border-radius:var(--radius);padding:26px 30px;color:#fff}
.apps h3{margin-bottom:12px;font-size:18px}
.apps .tags{display:flex;flex-wrap:wrap;gap:10px}
.apps .tags span{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:6px 16px;font-size:13.5px}

/* videos */
.videos{background:#0b1520}
.videos .sec-head h2{color:#fff}
.videos .sec-head p{color:#9db4c8}
.v-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.v-card video{width:100%;border-radius:var(--radius);background:#000;aspect-ratio:9/16;object-fit:cover;max-height:640px}
.v-card.v16 video{aspect-ratio:16/9;max-height:none;object-fit:contain}
.v-card h3{color:#fff;font-size:16px;margin-top:12px}
.v-card p{color:#9db4c8;font-size:13.5px}

/* about */
.about .wrap{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.about img{border-radius:var(--radius);box-shadow:var(--shadow)}
.about h2{color:var(--blue-dd);font-size:clamp(24px,3vw,34px);margin-bottom:14px}
.about p{color:var(--muted);margin-bottom:12px;font-size:15px}
.about .klist{margin-top:14px;display:grid;gap:10px}
.about .klist li{list-style:none;display:flex;gap:10px;font-size:14.5px;color:var(--ink)}
.about .klist li::before{content:"✓";color:var(--orange-d);font-weight:800}

/* faq */
.faq{background:#fff}
.faq .item{border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq button.q{width:100%;text-align:left;background:none;border:none;padding:16px 20px;font-size:15.5px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;gap:14px;align-items:center}
.faq button.q::after{content:"+";font-size:22px;color:var(--orange-d);flex-shrink:0}
.faq .item.open button.q::after{content:"−"}
.faq .a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 20px;color:var(--muted);font-size:14.5px}
.faq .item.open .a{padding-bottom:16px;max-height:400px}

/* contact */
.contact-box{display:grid;grid-template-columns:1fr 1fr;gap:32px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.contact-info h3{color:var(--blue-dd);font-size:22px;margin-bottom:14px}
.c-row{display:flex;gap:12px;align-items:flex-start;margin-bottom:18px}
.c-row .ic{width:42px;height:42px;border-radius:10px;background:rgba(13,92,171,.08);display:flex;align-items:center;justify-content:center;font-size:19px;flex-shrink:0}
.c-row b{display:block;font-size:14px;color:var(--ink)}
.c-row span,.c-row a{font-size:15px;color:var(--muted);word-break:break-all}
.c-row a:hover{color:var(--blue)}
form.cf{display:grid;gap:12px}
.cf input,.cf textarea,.cf select{border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;font-size:14.5px;font-family:inherit;outline:none;width:100%}
.cf input:focus,.cf textarea:focus,.cf select:focus{border-color:var(--blue)}
.cf textarea{min-height:110px;resize:vertical}
.cf-note{font-size:12.5px;color:var(--muted)}

/* footer */
footer{background:var(--blue-dd);color:#bcd3e8;padding:44px 0 26px;font-size:14px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;margin-bottom:30px}
footer h4{color:#fff;margin-bottom:12px;font-size:16px}
footer a{color:#bcd3e8}
footer a:hover{color:#fff}
footer .legal{border-top:1px solid rgba(255,255,255,.15);padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px}

/* floating whatsapp */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:200;width:60px;height:60px;border-radius:50%;background:#25d366;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(37,211,102,.45);transition:.2s}
.wa-float:hover{transform:scale(1.08)}
.wa-float svg{width:32px;height:32px;fill:#fff}
.wa-float .tip{position:absolute;right:70px;background:#111;color:#fff;font-size:12.5px;padding:6px 12px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transition:.2s}
.wa-float:hover .tip{opacity:1}

@media(max-width:920px){
  .hero .wrap{grid-template-columns:1fr}
  .about .wrap{grid-template-columns:1fr}
  .contact-box{grid-template-columns:1fr;padding:24px}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  footer .cols{grid-template-columns:1fr}
  nav.links{display:none}
}

/* ===== E-CATALOG BOOK ===== */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px}
.book-card{cursor:zoom-in;border-radius:var(--radius);overflow:hidden;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s;position:relative}
.book-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(13,92,171,.18)}
.book-card img{width:100%;aspect-ratio:1241/1684;object-fit:cover;display:block}
.book-card .bl{display:block;padding:8px 10px 10px;font-size:12.5px;line-height:1.35;color:var(--ink);font-weight:600}
.book-card .bl small{display:block;color:var(--mut);font-weight:400;margin-top:2px}
/* lightbox */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(10,25,45,.92);display:flex;align-items:center;justify-content:center;padding:24px}
.lightbox[hidden]{display:none}
.lightbox figure{margin:0;max-width:min(92vw,760px);max-height:92vh;display:flex;flex-direction:column;align-items:center}
.lightbox img{max-width:100%;max-height:86vh;border-radius:6px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox figcaption{color:#dce9f7;font-size:14px;margin-top:10px;text-align:center}
.lb-close{position:absolute;top:14px;right:18px;background:none;border:none;color:#fff;font-size:38px;cursor:pointer;line-height:1}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.12);border:none;color:#fff;font-size:46px;width:52px;height:84px;cursor:pointer;border-radius:8px}
.lb-nav:hover{background:rgba(255,255,255,.25)}
.lb-prev{left:10px}.lb-next{right:10px}
/* ===== OEM ===== */
.oem{background:linear-gradient(180deg,#f0f6fd,#fff)}
.oem-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin-bottom:26px}
.oem-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow);position:relative}
.oem-step b{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;font-size:17px;margin-bottom:12px}
.oem-step h3{margin:0 0 8px;font-size:16.5px}
.oem-step p{margin:0;font-size:14px;color:var(--mut);line-height:1.6}
.oem-cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}