/* ==========================================================================
   DLBOX — Mobile Socket Box / Power Distribution Box
   Industrial manufacturer homepage — EN (default) / 中文
   ========================================================================== */

:root{
  --orange:#E02030;
  --orange-d:#C01A27;
  --orange-l:#FF5A68;
  --dark:#1B1D22;
  --dark-2:#23262C;
  --dark-3:#2E323A;
  --gray:#6B7280;
  --gray-l:#F4F6F8;
  --gray-b:#E8ECF0;
  --white:#fff;
  --yellow:#FFC22B;
  --radius:12px;
  --shadow:0 12px 34px rgba(20,22,26,.10);
  --shadow-lg:0 22px 50px rgba(20,22,26,.16);
  --font:'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:#26292E;
  line-height:1.7;
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

.container{width:min(1200px,92%);margin:0 auto}

/* ===== Top bar ===== */
.topbar{background:var(--dark);color:#c8ccd3;font-size:.82rem}
.topbar-in{display:flex;justify-content:space-between;align-items:center;min-height:38px;flex-wrap:wrap;gap:4px}
.topbar-item{display:inline-flex;align-items:center;gap:6px}
.topbar-item a{color:#c8ccd3;transition:color .2s}
.topbar-item a:hover{color:var(--orange-l)}
.topbar .sep{opacity:.35}
.lang-btn{display:inline-flex;align-items:center;gap:6px;background:var(--orange);color:#fff;padding:2px 10px;border-radius:30px;font-size:.8rem;font-weight:600;transition:background .2s}
.lang-btn:hover{background:var(--orange-d)}
.lang-btn .lang-alt{opacity:.75}

/* ===== Header ===== */
.header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--gray-b);transition:box-shadow .25s}
.header.scrolled{box-shadow:0 6px 20px rgba(0,0,0,.08)}
.header-in{display:flex;align-items:center;justify-content:space-between;height:78px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{height:42px;width:auto}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-weight:800;font-size:1.25rem;color:var(--dark);letter-spacing:.5px}
.brand-name::first-letter{color:var(--orange)}
.brand-sub{font-size:.72rem;color:var(--gray);letter-spacing:.3px}
.nav{display:flex;align-items:center;gap:26px}
.nav-link{font-weight:600;font-size:.96rem;color:var(--dark-2);position:relative;line-height:24px;padding:7px 0;display:inline-flex;align-items:center;transition:color .2s}
.nav-link::after{content:'';position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--orange);transition:width .25s}
.nav-link:hover,.nav-link.active{color:var(--orange)}
.nav-link:hover::after,.nav-link.active::after{width:100%}
.header-actions{display:flex;align-items:center;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:8px;font-weight:700;font-size:.95rem;transition:all .22s;border:2px solid transparent}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d);transform:translateY(-2px);box-shadow:0 8px 22px rgba(224,32,48,.35)}
.btn-outline{border-color:rgba(255,255,255,.7);color:#fff;background:rgba(255,255,255,.08)}
.btn-outline:hover{background:var(--white);color:var(--dark)}
.btn-on-dark{border-color:var(--dark);color:var(--dark)}
.btn-on-dark:hover{background:var(--dark);color:#fff}
.btn-sm{padding:10px 18px;font-size:.88rem}
.btn-block{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:6px}
.nav-toggle span{width:26px;height:3px;background:var(--dark);border-radius:2px;transition:.25s}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;height:auto;display:flex;align-items:center;overflow:hidden;background:var(--dark)}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.1s ease}
.hero-slide.active{opacity:1}
.hero-overlay{position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,rgba(16,18,22,.9) 0%,rgba(16,18,22,.6) 45%,rgba(16,18,22,.28) 100%),linear-gradient(0deg,rgba(16,18,22,.75) 0%,transparent 45%)}
.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:6;width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.14);border:1.5px solid rgba(255,255,255,.4);color:#fff;font-size:2.1rem;line-height:1;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .22s,border-color .22s,transform .22s;backdrop-filter:blur(4px)}
.hero-arrow:hover{background:var(--orange);border-color:var(--orange)}
.hero-arrow:active{transform:translateY(-50%) scale(.94)}
.hero-prev{left:24px;padding:0 2px 2px 0}
.hero-next{right:24px;padding:0 0 2px 2px}
.hero-dots{position:absolute;bottom:92px;left:50%;transform:translateX(-50%);z-index:6;display:flex;gap:11px}
.hero-dot{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.42);cursor:pointer;transition:background .25s,transform .25s;padding:0;border:none}
.hero-dot.active{background:var(--orange);transform:scale(1.3)}
.hero-in{position:relative;z-index:2;color:#fff;padding:90px 0}
.hero-kicker{display:inline-block;color:var(--orange-l);letter-spacing:2px;font-weight:700;font-size:.9rem;margin-bottom:18px;text-transform:uppercase}
.hero-title{font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.12;font-weight:800;letter-spacing:-.5px;margin-bottom:20px}
.hero-sub{max-width:640px;font-size:1.12rem;color:#dfe3e8;margin-bottom:34px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:48px}
.hero-stats{display:flex;gap:0;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.18);padding-top:26px;max-width:720px}
.hstat{flex:1;min-width:120px}
.hstat b{display:block;font-size:1.5rem;color:var(--yellow);font-weight:800}
.hstat span{color:#c3c8cf;font-size:.85rem}
.hero-scroll{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);z-index:3;width:26px;height:44px;border:2px solid rgba(255,255,255,.55);border-radius:20px;display:flex;justify-content:center;padding-top:8px}
.hero-scroll span{width:4px;height:9px;background:#fff;border-radius:2px;animation:scroll 1.6s infinite}
@keyframes scroll{0%{opacity:1;transform:translateY(0)}100%{opacity:0;transform:translateY(12px)}}

/* ===== Sections ===== */
.section{padding:92px 0}
.sec-head{margin-bottom:52px}
.sec-head.center{text-align:center;max-width:720px;margin-left:auto;margin-right:auto}
.sec-head.left{max-width:720px}
.sec-tag{display:inline-block;background:rgba(224,32,48,.12);color:var(--orange);font-weight:700;font-size:.82rem;letter-spacing:1.5px;padding:6px 16px;border-radius:30px;text-transform:uppercase;margin-bottom:16px}
.sec-title{font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:800;color:var(--dark);line-height:1.2;letter-spacing:-.3px}
.sec-sub{color:var(--gray);margin-top:14px;font-size:1.05rem}

/* ===== About ===== */
.about{background:var(--white)}
.about-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:center}
.about-media{position:relative}
.about-img-main{border-radius:var(--radius);box-shadow:var(--shadow-lg);aspect-ratio:3/4;object-fit:cover;width:100%}
.about-badge{position:absolute;left:-18px;bottom:-18px;background:var(--orange);color:#fff;border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow-lg);text-align:center;min-width:140px}
.about-badge b{font-size:2rem;display:block;line-height:1}
.about-badge span{font-size:.82rem;opacity:.95}
.about-body .lead{font-size:1.14rem;color:var(--dark-2);font-weight:600;margin:6px 0 18px}
.about-body .para{color:#4a4f57;margin-bottom:14px}
.about-list{margin:20px 0 24px}
.about-list li{display:flex;gap:12px;align-items:center;margin-bottom:11px;color:#33383f;font-weight:500}
.check{color:#fff;background:var(--orange);width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:.85rem;flex-shrink:0}
.quote{border-left:4px solid var(--orange);background:var(--gray-l);padding:18px 22px;border-radius:0 10px 10px 0;margin-bottom:26px}
.quote p{color:#444;font-style:italic}
.quote-name{display:block;margin-top:10px;color:var(--gray);font-size:.9rem;font-weight:600}

/* ===== Products / Categories ===== */
.products{background:var(--gray-l)}
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.cat-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;display:flex;flex-direction:column}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.cat-img{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--gray-l)}
.cat-img img{width:100%;height:100%;object-fit:contain;transition:transform .35s}
.cat-card:hover .cat-img img{transform:scale(1.05)}
.cat-body{padding:22px 24px 26px;flex:1;display:flex;flex-direction:column}
.cat-body h3{font-size:1.18rem;color:var(--dark);margin-bottom:8px}
.cat-body p{color:var(--gray);font-size:.94rem;flex:1}
.cat-more{display:inline-flex;align-items:center;color:var(--orange);font-weight:700;margin-top:14px;transition:gap .2s}
.cat-more:hover{gap:6px}
.cat-custom .cat-body h3{color:var(--orange-d)}

/* ===== Category carousel ===== */
.cat-carousel{position:relative;margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw)}
.cat-track{display:flex;gap:20px;overflow:hidden;padding:8px 24px 14px;width:max-content;will-change:transform;transition:transform .5s cubic-bezier(.25,.7,.3,1)}
.cat-track .cat-card{flex:0 0 280px}
.cat-arrow{position:absolute;top:40%;transform:translateY(-50%);z-index:5;width:44px;height:44px;border-radius:50%;background:#fff;border:none;color:var(--orange);font-size:1.4rem;line-height:1;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px rgba(15,23,42,.18);cursor:pointer;transition:all .2s}
.cat-arrow:hover{background:var(--orange);color:#fff;transform:translateY(-50%) translateX(2px)}
.cat-prev{left:12px}
.cat-next{right:12px}
@media(max-width:600px){.cat-arrow{width:40px;height:40px;font-size:1.6rem}.cat-prev{left:-4px}.cat-next{right:-4px}.cat-track .cat-card{flex:0 0 200px}}

/* ===== Featured ===== */
.featured{background:var(--white)}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.feat-card{background:#fff;border:1px solid var(--gray-b);border-radius:var(--radius);overflow:hidden;transition:transform .25s,box-shadow .25s;display:flex;flex-direction:column}
.feat-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.feat-img{aspect-ratio:3/4;background:var(--gray-l);overflow:hidden}
.feat-img img{width:100%;height:100%;object-fit:contain}
.feat-body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.feat-body h3{color:var(--dark);font-size:1.15rem}
.feat-tag{color:var(--orange);font-weight:600;font-size:.9rem;margin:4px 0 6px}
.feat-spec{color:var(--gray);font-size:.84rem;flex:1}
.feat-link{color:var(--dark);font-weight:700;margin-top:12px;transition:color .2s}
.feat-link:hover{color:var(--orange)}

/* ===== Applications ===== */
.applications{background:var(--dark);}
.applications .sec-tag{background:rgba(255,255,255,.12);color:var(--orange-l)}
.applications .sec-title{color:#fff}
.applications .sec-sub{color:#aab0b8}
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.app-card{position:relative;border-radius:var(--radius);overflow:hidden;height:280px;display:block}
.app-img{position:absolute;inset:0;background-size:cover;background-position:center;transition:transform .4s}
.app-mask{position:absolute;inset:0;z-index:1;display:flex;flex-direction:column;justify-content:flex-end;padding:22px;background:linear-gradient(0deg,rgba(10,12,15,.85) 0%,rgba(10,12,15,.15) 55%,transparent 80%);color:#fff;transition:background .3s}
.app-mask h3{font-size:1.25rem;font-weight:800}
.app-mask p{color:#cfd4da;font-size:.9rem;opacity:0;transform:translateY(10px);transition:.3s;max-width:90%}
.app-card:hover .app-img{transform:scale(1.07)}
.app-card:hover .app-mask p{opacity:1;transform:translateY(0)}

/* ===== Why / Features ===== */
.why{background:var(--gray-l)}
.feat-grid-features{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.feat-feature{background:#fff;border-radius:var(--radius);padding:30px 28px;box-shadow:var(--shadow);transition:transform .25s;border-top:3px solid transparent}
.feat-feature:hover{transform:translateY(-5px);border-top-color:var(--orange)}
.f-ico{width:58px;height:58px;border-radius:14px;background:rgba(224,32,48,.12);color:var(--orange);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.f-ico svg{width:30px;height:30px}
.feat-feature h3{font-size:1.14rem;color:var(--dark);margin-bottom:10px}
.feat-feature p{color:var(--gray);font-size:.94rem}

/* ===== CTA ===== */
.cta{background:linear-gradient(120deg,var(--orange) 0%,var(--orange-d) 100%);color:#fff}
.cta-in{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:56px 0;flex-wrap:wrap}
.cta-text h2{font-size:clamp(1.4rem,2.8vw,2rem);font-weight:800;margin-bottom:8px}
.cta-text p{color:#fff;opacity:.92}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.cta-actions .btn-primary{background:#fff;color:var(--orange-d)}
.cta-actions .btn-primary:hover{background:var(--dark);color:#fff}

/* ===== Contact ===== */
.contact{background:#fff}
.contact-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:46px;align-items:start}
.c-block h3{font-size:1.2rem;color:var(--dark)}
.c-sub{color:var(--gray);font-size:.9rem;margin:2px 0 18px}
.c-row{display:flex;gap:16px;padding:13px 0;border-bottom:1px dashed var(--gray-b)}
.c-lab{font-weight:700;color:var(--dark);min-width:90px;flex-shrink:0}
.c-row span:last-child{color:#3c4148}
.c-row a{color:var(--orange-d);font-weight:600}
.c-row a:hover{text-decoration:underline}
.c-map{margin-top:20px;border-radius:var(--radius);overflow:hidden;height:150px;background:linear-gradient(135deg,var(--dark-2),var(--dark-3));position:relative;display:flex;align-items:center;justify-content:center}
.map-placeholder{color:#aab0b8;font-weight:600;letter-spacing:1px}
.map-placeholder::before{content:'📍';display:block;font-size:1.8rem;margin-bottom:6px;text-align:center}
.contact-form{background:var(--gray-l);border-radius:var(--radius);padding:34px 32px;box-shadow:var(--shadow)}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.f-col{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}
.f-col label{font-weight:600;font-size:.9rem;color:var(--dark)}
.f-col input,.f-col textarea{border:1px solid var(--gray-b);background:#fff;border-radius:8px;padding:12px 14px;font-family:inherit;font-size:.95rem;resize:vertical;transition:border .2s,box-shadow .2s}
.f-col input:focus,.f-col textarea:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(224,32,48,.15)}
.form-note{margin-top:12px;font-size:.82rem;color:var(--gray);text-align:center}
.form-ok{background:#e7f7ee;color:#1a7f45;padding:12px 16px;border-radius:8px;margin-top:6px;font-weight:600;font-size:.9rem;text-align:center;display:none}

/* ===== Footer ===== */
.footer{background:var(--dark);color:#c3c8cf;padding:70px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:46px}
.f-logo{height:38px;margin-bottom:18px}
.f-brand p{font-size:.92rem;color:#aab0b8}
.f-col h4{color:#fff;font-size:1.02rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.f-col h4::after{content:'';position:absolute;left:0;bottom:0;width:32px;height:2px;background:var(--orange)}
.f-col a,.f-col span{display:block;color:#c3c8cf;font-size:.92rem;padding:5px 0;transition:color .2s}
.f-col a:hover{color:var(--orange-l)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.85rem;color:#8a919b}
.footer-bottom span{display:inline-block}

/* ===== Back to top ===== */
.backtop{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;background:var(--orange);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:800;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s;z-index:60}
.backtop.show{opacity:1;visibility:visible;transform:translateY(0)}
.backtop:hover{background:var(--orange-d)}

/* ===== Reveal animation ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .cat-grid,.feat-grid,.app-grid,.feat-grid-features{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:860px){
  .nav{position:fixed;top:0;right:-100%;width:300px;height:100vh;background:#fff;flex-direction:column;gap:0;padding:90px 30px;box-shadow:-10px 0 30px rgba(0,0,0,.12);transition:right .3s;z-index:90}
  .nav.open{right:0}
  .nav-link{font-size:1.05rem;padding:14px 0;border-bottom:1px solid var(--gray-b)}
  .nav-toggle{display:flex;z-index:95}
  .nav-toggle.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .header-cta{display:none}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .about-badge{left:10px}
  .cta-in{flex-direction:column;text-align:center}
  .topbar-site{display:none}
}
@media(max-width:600px){
  .cat-grid,.feat-grid,.app-grid,.feat-grid-features{grid-template-columns:1fr}
  .hero-stats{flex-direction:column;gap:14px}
  .section{padding:64px 0}
  .f-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-scroll{display:none}
  .hero-arrow{width:42px;height:42px;font-size:1.7rem}
  .hero-prev{left:12px}
  .hero-next{right:12px}
  .hero-dots{bottom:84px}
}

/* refined category tag pill */
.cat-tag{position:absolute;top:12px;left:12px;z-index:2;background:var(--orange);color:#fff;font-size:.7rem;font-weight:600;letter-spacing:.4px;padding:5px 12px;border-radius:20px;box-shadow:0 2px 8px rgba(224,32,48,.35)}
/* pagination dots */
.cat-dots{display:flex;justify-content:center;align-items:center;gap:8px;margin-top:28px}
.cat-dot{width:20px;height:4px;border-radius:2px;background:#d8dde6;border:none;padding:0;cursor:pointer;transition:all .3s}
.cat-dot.active{width:36px;background:var(--orange)}
.cat-card .cat-body{padding:20px 22px 24px}
.cat-card h3{font-size:1.12rem;margin-bottom:8px}

.cat-dots{display:none!important}


/* ---- mobile topbar layout ---- */
@media(max-width:600px){
  .topbar-in{flex-direction:column;align-items:stretch;gap:3px;padding:8px 16px}
  .topbar .sep{display:none}
  .topbar-item{font-size:.78rem;white-space:nowrap}
  .topbar-left{width:100%;display:flex;flex-direction:column;align-items:flex-start;gap:3px}
  .topbar-right{width:100%;display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:2px}
  .lang-btn{margin-left:auto;flex:0 0 auto}
}


/* ---- nav dropdown ---- */
.nav-item{position:relative}
.nav-item.has-sub .nav-link{line-height:24px;padding:7px 0;display:inline-flex;align-items:center}.nav-item.has-sub .nav-link::after{content:'';position:absolute;left:auto;right:-15px;top:50%;width:6px;height:6px;border-right:1.6px solid var(--dark-2);border-bottom:1.6px solid var(--dark-2);transform:translateY(-70%) rotate(45deg);transition:transform .25s,border-color .25s}
.nav-item.has-sub .nav-link:hover::after{transform:translateY(-40%) rotate(225deg);border-color:var(--orange)}
.nav-sub{position:absolute;top:calc(100% + 14px);left:50%;transform:translateX(-50%) translateY(8px);min-width:210px;background:rgba(255,255,255,.98);border-radius:8px;padding:10px 6px;box-shadow:0 18px 45px rgba(10,37,64,.16);opacity:0;visibility:hidden;transition:opacity .22s ease,transform .22s ease,visibility .22s;z-index:120}
.nav-sub::before{content:'';position:absolute;top:-14px;left:0;right:0;height:14px}
.nav-sub-link{display:block;padding:9px 13px;font-size:.9rem;font-weight:500;color:var(--dark-2);border-radius:5px;transition:background .2s,color .2s;cursor:pointer;white-space:nowrap}
.nav-sub-link:hover{background:var(--orange-l-soft,rgba(224,32,48,.08));color:var(--orange)}
.nav-item:hover .nav-sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
@media(max-width:860px){
  .nav-sub{position:static;transform:none;opacity:1;visibility:visible;min-width:0;box-shadow:none;padding:0 0 6px 14px;border-radius:0;background:transparent}
  .nav-item:hover .nav-sub{transform:none}
  .nav-sub-link{padding:10px 0;color:var(--dark-2)}
  .nav-sub-link:hover{background:transparent}
  .nav-item.has-sub .nav-link::after{right:auto}
}