:root{
  --blue:#1a66c2; --blue-dark:#0e4a94; --blue-deep:#0a2f5e;
  --green:#3fae5a; --accent:#f5a623;
  --ink:#1c2530; --ink-2:#4a5768; --ink-3:#7c8899;
  --bg:#ffffff; --bg-alt:#f3f7fb; --bg-dark:#0e2c52;
  --line:#e1e8f0; --radius:12px;
  --shadow:0 2px 14px rgba(14,44,82,.08);
  --shadow-lg:0 14px 40px rgba(14,44,82,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;overflow-x:hidden;-webkit-tap-highlight-color:rgba(26,102,194,.12)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
section[id],article[id],.article-body h2[id]{scroll-margin-top:80px}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
section{padding:78px 0}
h1,h2,h3,h4{line-height:1.25;color:var(--ink);font-weight:700}
h1{font-size:clamp(30px,4.4vw,48px)}
h2{font-size:clamp(26px,3.2vw,38px)}
h3{font-size:20px}
.kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:14px}
.section-head{max-width:760px;margin-bottom:44px}
.section-head p{color:var(--ink-2);margin-top:14px;font-size:17px}
.btn{display:inline-block;padding:13px 28px;border-radius:8px;font-weight:600;font-size:16px;cursor:pointer;border:none;transition:.2s;text-align:center}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--blue);border:2px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}
.btn-light{background:#fff;color:var(--blue-dark)}
.btn-light:hover{background:#e8f1fc}

/* ===== Top bar & header ===== */
.topbar{background:var(--bg-dark);color:#c9d8ec;font-size:13.5px;padding:7px 0}
.topbar .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px}
.topbar a{color:#fff;font-weight:600}
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px}
.logo svg{height:38px}
.logo .cn{font-size:12px;color:var(--ink-3);line-height:1.2}
nav ul{display:flex;gap:19px;list-style:none;align-items:center}
nav a{color:var(--ink);font-weight:600;font-size:14.5px;white-space:nowrap}
nav a:hover{color:var(--blue)}
.nav-cta{padding:10px 20px;font-size:15px}
.hamburger{display:none;background:none;border:none;cursor:pointer;padding:8px}
.hamburger span{display:block;width:24px;height:2.5px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.25s}
.mobile-nav{display:none;background:#fff;border-bottom:1px solid var(--line);padding:12px 24px 20px}
.mobile-nav.open{display:block}
.mobile-nav a{display:block;padding:11px 0;font-weight:600;color:var(--ink);border-bottom:1px solid var(--bg-alt)}

/* ===== Hero ===== */
.hero{background:linear-gradient(115deg,var(--bg-dark) 0%,var(--blue-deep) 55%,#123f79 100%);color:#fff;padding:92px 0 0;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-140px;top:-140px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(63,174,90,.25),transparent 65%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;position:relative;z-index:2}
.hero h1{color:#fff}
.hero h1 em{font-style:italic;color:#8fc7ff}
.hero p.lead{margin:20px 0 30px;font-size:18px;color:#cfe0f4;max-width:560px}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap}
.hero-img{border-radius:16px;overflow:hidden;box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.15)}
.hero-img img{width:100%;height:100%;object-fit:cover}
.stat-strip{background:rgba(255,255,255,.06);border-top:1px solid rgba(255,255,255,.14);margin-top:70px;position:relative;z-index:2}
.stat-strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:22px 24px}
.stat{text-align:center}
.stat b{display:block;font-size:26px;color:#8fc7ff}
.stat span{font-size:13.5px;color:#b9cde6}

/* ===== Cards ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card h3{margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15px}
.card .arrow{display:inline-block;margin-top:14px;font-weight:700;color:var(--blue)}
.series-card{border-top:4px solid var(--blue)}
.series-card.smt{border-top-color:var(--green)}
.series-card .price-tag{font-size:13px;font-weight:700;color:var(--green);background:#eaf7ee;display:inline-block;padding:3px 10px;border-radius:20px;margin-bottom:12px}
.series-card ul{margin:14px 0 0 18px;color:var(--ink-2);font-size:14.5px}
.series-card ul li{margin:5px 0}
.series-img{height:210px;overflow:hidden;border-radius:8px;margin-bottom:20px}
.series-img img{width:100%;height:100%;object-fit:cover;transition:.4s}
.series-card:hover .series-img img{transform:scale(1.04)}
.banner-img{border-radius:var(--radius);overflow:hidden;margin-bottom:36px;box-shadow:var(--shadow)}
.banner-img img{width:100%;height:300px;object-fit:cover}
.app-card{padding:0;overflow:hidden}
.app-card img{width:100%;height:170px;object-fit:cover;transition:.4s}
.app-card:hover img{transform:scale(1.05)}
.app-card .body{padding:22px 24px 26px}

/* ===== Product grid ===== */
.prod-card{padding:0;overflow:hidden}
.prod-card .imgbox{background:#fff;border-bottom:1px solid var(--line);padding:26px;display:flex;align-items:center;justify-content:center;min-height:210px}
.prod-card .imgbox img{max-height:190px;object-fit:contain}
.prod-card .body{padding:22px 24px 26px}
.prod-card .model{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--blue);text-transform:uppercase}
.prod-card h3{margin:6px 0 8px;font-size:19px}
.prod-card .spec{font-size:14px;color:var(--ink-2)}
.prod-card .spec b{color:var(--ink)}
.badge{display:inline-block;font-size:12px;font-weight:700;padding:3px 10px;border-radius:20px;margin-bottom:10px}
.badge.green{background:#eaf7ee;color:#217a3c}
.badge.blue{background:#e7f0fb;color:var(--blue-dark)}

/* ===== Tables ===== */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:760px}
thead th{background:var(--bg-dark);color:#fff;padding:14px 16px;text-align:left;font-weight:600;white-space:nowrap}
tbody td{padding:13px 16px;border-top:1px solid var(--line);color:var(--ink-2)}
tbody tr:hover{background:#f6faff}
tbody td:first-child{font-weight:700;color:var(--ink);white-space:nowrap}
.table-note{font-size:13px;color:var(--ink-3);margin-top:12px}

/* ===== Feature list ===== */
.feature-num{display:flex;gap:16px;margin-bottom:22px}
.feature-num .n{flex:0 0 42px;height:42px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:17px}
.feature-num h4{margin-bottom:4px}
.feature-num p{color:var(--ink-2);font-size:14.5px}

/* ===== Split sections ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.split img{border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.check-list{list-style:none;margin-top:18px}
.check-list li{padding:7px 0 7px 30px;position:relative;color:var(--ink-2)}
.check-list li::before{content:"✓";position:absolute;left:0;top:7px;color:var(--green);font-weight:800}

/* ===== Why DDJ / dark band ===== */
.dark-band{background:var(--bg-dark);color:#d7e4f4}
.dark-band h2,.dark-band h3,.dark-band h4{color:#fff}
.dark-band .card{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.12);box-shadow:none;color:#d7e4f4}
.dark-band .card p{color:#b9cde6}
.dark-band .stat b{color:#8fc7ff}

/* ===== FAQ ===== */
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin-bottom:12px;overflow:hidden}
.faq summary{padding:18px 22px;font-weight:600;cursor:pointer;list-style:none;position:relative;padding-right:48px}
.faq summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--blue);transition:.2s}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq details p{padding:0 22px 20px;color:var(--ink-2);font-size:15px}

/* ===== Quote form ===== */
.quote-band{background:linear-gradient(120deg,var(--blue-deep),var(--blue-dark));color:#fff}
.quote-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:52px;align-items:start}
.quote-grid h2{color:#fff}
.quote-grid p{color:#c9d8ec}
.contact-list{list-style:none;margin-top:22px}
.contact-list li{padding:9px 0;display:flex;gap:12px;align-items:flex-start;color:#e2ecf8}
.contact-list .ic{color:#8fc7ff;font-weight:700}
form.quote-form{background:#fff;border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-lg)}
form.quote-form label{display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin:14px 0 6px}
form.quote-form input,form.quote-form select,form.quote-form textarea{width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit;color:var(--ink)}
form.quote-form input:focus,form.quote-form select:focus,form.quote-form textarea:focus{outline:2px solid rgba(26,102,194,.35);border-color:var(--blue)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-msg{margin-top:14px;font-size:14.5px;font-weight:600;color:var(--green);display:none}

/* ===== Footer ===== */
footer{background:#0a2138;color:#9db4cf;padding:60px 0 30px;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:40px}
footer h4{color:#fff;margin-bottom:16px;font-size:15px;letter-spacing:.05em}
footer ul{list-style:none}
footer li{margin:9px 0}
footer a{color:#9db4cf}
footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px}
.logo-foot svg{height:34px}

/* ===== Blog index ===== */
.page-head{background:linear-gradient(115deg,var(--bg-dark),var(--blue-deep) 60%,#123f79);color:#fff;padding:64px 0 56px}
.page-head h1{color:#fff}
.page-head p{color:#c9d8ec;margin-top:14px;max-width:720px;font-size:17px}
.crumbs{font-size:13.5px;color:#9fbbdd;margin-bottom:16px}
.crumbs a{color:#9fbbdd}
.crumbs a:hover{color:#fff}
.post-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.post-card .thumb{height:190px;overflow:hidden;background:linear-gradient(160deg,#eef3f9,#dde7f2)}
.post-card .thumb img{width:100%;height:100%;object-fit:cover;transition:.4s}
.post-card:hover .thumb img{transform:scale(1.05)}
.post-card .body{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
.post-card .meta{font-size:12.5px;color:var(--ink-3);letter-spacing:.06em;text-transform:uppercase;font-weight:600;margin-bottom:10px}
.post-card h3{font-size:19px;margin-bottom:10px}
.post-card p{color:var(--ink-2);font-size:14.8px;flex:1}
.post-card .arrow{margin-top:16px}

/* ===== Article ===== */
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px;align-items:start}
.article-body{max-width:760px}
.article-body h2{font-size:26px;margin:38px 0 14px}
.article-body h3{font-size:19px;margin:26px 0 10px}
.article-body p{color:var(--ink-2);margin:14px 0;font-size:16.5px}
.article-body ul,.article-body ol{margin:14px 0 14px 22px;color:var(--ink-2)}
.article-body li{margin:8px 0}
.article-body table{min-width:0;font-size:14.5px}
.article-body strong{color:var(--ink)}
.article-body .callout{background:var(--bg-alt);border-left:4px solid var(--blue);border-radius:8px;padding:18px 22px;margin:24px 0;font-size:15.5px;color:var(--ink-2)}
.article-body .callout b{color:var(--ink)}
.article-lead{font-size:18.5px;color:var(--ink);font-weight:500;line-height:1.6}
.side-card{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.side-card h4{font-size:15px;margin-bottom:12px}
.side-card ul{list-style:none;font-size:14.5px}
.side-card li{margin:9px 0;padding-left:16px;position:relative;color:var(--ink-2)}
.side-card li::before{content:"›";position:absolute;left:0;color:var(--blue);font-weight:700}
.side-card a{color:var(--ink-2)}
.side-card a:hover{color:var(--blue)}
.side-cta{background:var(--blue-dark);color:#dbe8f8}
.side-cta h4{color:#fff}
.side-cta p{font-size:14.5px;margin-bottom:14px;color:#c9d8ec}
.post-nav{display:flex;justify-content:space-between;gap:18px;margin-top:52px;padding-top:26px;border-top:1px solid var(--line);font-size:15px}

/* ===== Floating WhatsApp ===== */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:90;width:54px;height:54px;border-radius:50%;
  background:#25D366;display:flex;align-items:center;justify-content:center;text-decoration:none;
  box-shadow:0 6px 18px rgba(11,32,60,.3);transition:transform .18s ease,box-shadow .18s ease}
.wa-float svg{width:29px;height:29px;display:block}
.wa-float:hover{transform:translateY(-2px) scale(1.05);box-shadow:0 11px 26px rgba(11,32,60,.38)}
.wa-float::after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid #25D366;
  animation:wa-pulse 2.4s ease-out infinite;pointer-events:none}
@keyframes wa-pulse{0%{transform:scale(1);opacity:.6}70%{transform:scale(1.5);opacity:0}100%{transform:scale(1.5);opacity:0}}
@media(prefers-reduced-motion:reduce){.wa-float::after{animation:none;display:none}}

/* ===== Responsive ===== */
.swipe-hint{display:none;font-size:12.5px;font-weight:600;color:var(--ink-3);margin:0 0 8px}

/* --- Small laptop / large tablet --- */
@media(max-width:1080px){
  nav ul{gap:13px}
  nav a{font-size:14px}
  .nav-cta{padding:10px 16px;font-size:14.5px}
}

/* --- Tablet --- */
@media(max-width:960px){
  .hero-grid,.split,.quote-grid{grid-template-columns:1fr}
  .hero-grid{gap:34px}
  .split{gap:34px}
  .quote-grid{gap:36px}
  .grid-3{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  nav.desktop-nav{display:none}
  .hamburger{display:block}
  .stat-strip .container{grid-template-columns:1fr 1fr;gap:18px 10px}
  .article-wrap{grid-template-columns:minmax(0,1fr);gap:40px}
  .article-body{max-width:none}
  .article-body table{min-width:560px}
  .topbar .container{justify-content:center;text-align:center}
}

/* --- Phone --- */
@media(max-width:700px){
  .container{padding:0 18px}
  section{padding:48px 0}
  h1{font-size:28px}
  h2{font-size:23px}
  h3{font-size:18px}
  .kicker{font-size:12px;letter-spacing:.1em;margin-bottom:10px}
  .section-head{margin-bottom:30px}
  .section-head p{margin-top:11px;font-size:15.5px}
  .btn{padding:12px 22px;font-size:15.5px}

  .topbar{padding:8px 0;font-size:12px}
  .topbar .container{display:block}
  .topbar .container>span{display:block;margin:2px 0}
  .wa-float{width:50px;height:50px;right:14px;bottom:14px}
  .wa-float svg{width:27px;height:27px}

  .nav-wrap{height:58px}
  .logo svg{height:32px}
  .logo .cn{font-size:11px}
  .mobile-nav{padding:8px 18px 16px;max-height:calc(100vh - 96px);overflow-y:auto;-webkit-overflow-scrolling:touch}
  .mobile-nav a{padding:13px 0;min-height:46px;display:flex;align-items:center}

  .hero{padding:50px 0 0}
  .hero p.lead{margin:16px 0 24px;font-size:16.5px}
  .hero-ctas{gap:10px}
  .hero-ctas .btn{flex:1 1 100%;width:100%}
  .hero-img{border-radius:12px}
  .stat-strip{margin-top:42px}
  .stat-strip .container{padding:18px}
  .stat b{font-size:21px}
  .stat span{font-size:12.5px}

  .grid-2,.grid-3{gap:16px}
  .card{padding:22px}
  .series-img{height:168px;margin-bottom:16px}
  .banner-img{margin-bottom:26px}
  .banner-img img{height:180px}
  .app-card img{height:150px}
  .app-card .body{padding:18px 20px 22px}
  .prod-card .imgbox{min-height:170px;padding:20px}
  .prod-card .imgbox img{max-height:150px}
  .prod-card .body{padding:18px 20px 22px}
  .feature-num{gap:12px;margin-bottom:18px}
  .feature-num .n{flex:0 0 36px;height:36px;font-size:15px}
  .check-list li{padding-left:26px}

  .table-wrap{position:relative;-webkit-overflow-scrolling:touch}
  .table-wrap::after{content:"";position:absolute;top:1px;right:1px;bottom:1px;width:24px;border-radius:0 11px 11px 0;background:linear-gradient(to right,rgba(255,255,255,0),rgba(255,255,255,.94));pointer-events:none}
  .swipe-hint{display:block}
  table{font-size:13px}
  thead th{padding:11px 12px;font-size:12.5px}
  tbody td{padding:11px 12px}
  .table-note{font-size:12.5px}

  .faq summary{padding:15px 44px 15px 16px;font-size:15px}
  .faq details p{padding:0 16px 16px;font-size:14.5px}

  form.quote-form{padding:22px 18px}
  form.quote-form input,form.quote-form select,form.quote-form textarea{font-size:16px;padding:12px 13px}
  .contact-list li{padding:8px 0;font-size:15px}

  footer{padding:44px 0 24px;font-size:14px}
  .footer-grid{grid-template-columns:1fr;gap:26px;margin-bottom:30px}
  .footer-bottom{flex-direction:column;gap:6px}

  .page-head{padding:40px 0 34px}
  .page-head p{font-size:15.5px}
  .post-card .thumb{height:168px}
  .post-card .body{padding:20px 20px 24px}
  .post-card h3{font-size:17.5px}
  .article-body h2{font-size:22px;margin:30px 0 12px}
  .article-body h3{font-size:17.5px;margin:22px 0 8px}
  .article-body p{font-size:16px}
  .article-body ul,.article-body ol{margin-left:18px}
  .article-body .callout{padding:15px 16px;font-size:15px}
  .article-lead{font-size:17px}
  .side-card{padding:20px}
  .post-nav{flex-direction:column;gap:10px;margin-top:36px;font-size:14.5px}
}

/* --- Small phone --- */
@media(max-width:430px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .stat-strip .container{grid-template-columns:1fr 1fr;gap:16px 8px;padding:16px}
  .stat b{font-size:19px}
  h1{font-size:26px}
  .hero-ctas .btn{font-size:15px;padding:12px 16px}
  .logo .cn{display:none}
}