/* ==========================================
   海德金电子 / Haidejin Electronics
   企业官网样式 - 响应式 + 多语言
   ========================================== */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a73e8;
  --primary-dark:#1557b0;
  --accent:#ff6d00;
  --bg:#f8f9fa;
  --bg-white:#ffffff;
  --text:#212529;
  --text-light:#6c757d;
  --border:#dee2e6;
  --radius:8px;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --max-width:1200px;
  --nav-height:120px;
  --font-zh:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --font-en:"Segoe UI",system-ui,-apple-system,sans-serif;
  --font-ja:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  --font-ko:"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--font-zh);
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
html[lang="en"] body{font-family:var(--font-en)}
html[lang="ja"] body{font-family:var(--font-ja)}
html[lang="ko"] body{font-family:var(--font-ko)}

a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:var(--radius);
  font-size:1rem;font-weight:600;cursor:pointer;
  border:none;transition:all .25s;text-decoration:none;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#e65100;color:#fff}
.btn-outline{
  background:transparent;color:var(--primary);
  border:2px solid var(--primary);
}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-lg{padding:16px 36px;font-size:1.1rem}

/* --- CLS Prevention: reserve space before JS renders --- */
span[data-i18n],a[data-i18n]{min-height:1.2em;display:inline-block}
h1[data-i18n],h2[data-i18n],h3[data-i18n],h4[data-i18n],p[data-i18n]{min-height:1.2em}
#main-nav{min-height:44px;min-width:320px}
#lang-switcher{min-height:42px;min-width:80px}
#cat-grid{min-height:400px;contain:layout style}
#site-footer{min-height:200px;contain:layout style}
.hero-slide-content{min-height:280px}
span[data-i18n="site.shortName"]{min-width:80px}
/* Release placeholders after JS renders */
.loaded [data-i18n]{min-height:0}
.loaded .hero-slide-content{min-height:0}
.loaded #cat-grid{min-height:0;contain:none}
.loaded #site-footer{min-height:0;contain:none}

/* --- Header / Nav --- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:var(--bg-white);
  box-shadow:0 1px 4px rgba(0,0,0,.06);
  height:var(--nav-height);
}
.site-header .container{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;
}
.logo{
  font-size:1.6rem;font-weight:700;color:var(--text);
  white-space:nowrap;
}
.logo span{color:var(--primary)}
.main-nav{display:flex;gap:4px}
.main-nav a{
  padding:10px 20px;border-radius:var(--radius);
  color:var(--text);font-weight:500;font-size:1rem;
  transition:all .2s;
}
.main-nav a:hover,.main-nav a.active{
  background:var(--primary);color:#fff;
}

/* Language Switcher */
.lang-switcher{position:relative}
.lang-current{
  display:flex;align-items:center;gap:6px;
  padding:8px 12px;border-radius:var(--radius);
  background:transparent;border:1px solid var(--border);
  cursor:pointer;font-size:.9rem;color:var(--text);
}
.lang-current img,.lang-dropdown img{vertical-align:middle;border-radius:2px}
.lang-current::after{content:"▾";font-size:.7rem;margin-left:2px}
.lang-dropdown{
  display:none;position:absolute;top:100%;right:0;
  background:var(--bg-white);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow);
  min-width:120px;overflow:hidden;
}
.lang-switcher:hover .lang-dropdown,
.lang-switcher:focus-within .lang-dropdown{display:block}
.lang-dropdown a{
  display:block;padding:10px 16px;color:var(--text);
  font-size:.9rem;transition:background .15s;
}
.lang-dropdown a:hover{background:var(--bg)}
.lang-dropdown a.active{background:var(--primary);color:#fff}

/* Header Email */
.header-email{
  display:flex;align-items:center;gap:6px;
  color:var(--text);font-size:.9rem;text-decoration:none;
  padding:6px 12px;border-radius:var(--radius);
  transition:color .2s;white-space:nowrap;
}
.header-email:hover{color:var(--primary)}

/* Mobile Menu Toggle */
.menu-toggle{
  display:none;flex-direction:column;gap:5px;
  background:none;border:none;cursor:pointer;padding:4px;
}
.menu-toggle span{
  display:block;width:24px;height:2.5px;
  background:var(--text);border-radius:2px;transition:all .3s;
}
.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* --- Hero / Carousel --- */
.hero{
  position:relative;overflow:hidden;
  background:#0d1b3e;color:#fff;
}
.hero-slides{position:relative;width:100%;min-height:480px}
.hero-slide{
  position:absolute;top:0;left:0;width:100%;height:100%;
  display:flex;align-items:center;justify-content:center;
  text-align:center;padding:80px 20px;
  background-size:cover;background-position:center;
  opacity:0;transition:opacity .8s ease-in-out;
  pointer-events:none;
}
.hero-slide::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(13,27,62,.85) 0%,rgba(26,58,107,.75) 50%,rgba(26,82,118,.7) 100%);
  z-index:0;
}
.hero-slide.active{opacity:1;pointer-events:auto}
.hero-slide-content{position:relative;z-index:1;max-width:800px}
.hero-slide h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;line-height:1.3}
.hero-slide p{font-size:1.2rem;opacity:.9;max-width:700px;margin:0 auto 36px}
.hero-slide .btn-group{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Carousel indicators */
.hero-dots{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  display:flex;gap:10px;z-index:2;
}
.hero-dots button{
  width:12px;height:12px;border-radius:50%;border:2px solid rgba(255,255,255,.5);
  background:transparent;cursor:pointer;transition:all .3s;padding:0;
}
.hero-dots button.active{background:#fff;border-color:#fff;transform:scale(1.2)}

/* Carousel arrows */
.hero-arrow{
  position:absolute;top:50%;transform:translateY(-50%);
  z-index:2;background:rgba(255,255,255,.15);
  border:none;color:#fff;width:48px;height:48px;
  border-radius:50%;font-size:1.3rem;cursor:pointer;
  transition:background .3s;display:flex;align-items:center;justify-content:center;
}
.hero-arrow:hover{background:rgba(255,255,255,.3)}
.hero-arrow.prev{left:20px}
.hero-arrow.next{right:20px}

/* --- Sections --- */
.section{padding:80px 0}
.section-title{
  text-align:center;margin-bottom:56px;
}
.section-title h2{font-size:2rem;font-weight:700;margin-bottom:12px}
.section-title p{color:var(--text-light);max-width:600px;margin:0 auto}

/* Category Cards */
.cat-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.cat-card{
  background:var(--bg-white);border-radius:var(--radius);
  box-shadow:var(--shadow);text-align:center;overflow:hidden;
  transition:transform .3s,box-shadow .3s;
  border:1px solid transparent;
}
.cat-card:not(.cat-card-img){padding:40px 28px}
.cat-card:hover{
  transform:translateY(-4px);
  box-shadow:0 8px 30px rgba(0,0,0,.12);
  border-color:var(--primary);
}
.cat-icon{
  width:72px;height:72px;margin:0 auto 20px;
  background:rgba(26,115,232,.08);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:2rem;color:var(--primary);
}
.cat-img{
  width:100%;aspect-ratio:8/5;
  object-fit:cover;object-position:center;
  display:block;
}
.cat-body{padding:24px 28px 32px}
.cat-body h3,.cat-card h3{font-size:1.25rem;margin-bottom:8px}
.cat-body p,.cat-card p{color:var(--text-light);font-size:.9rem;margin-bottom:16px;line-height:1.6}
.cat-body .btn,.cat-card .btn{margin-top:8px}

/* Features */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:24px;
}
.feature-item{text-align:center;padding:24px}
.feature-item .icon{
  font-size:2.5rem;margin-bottom:12px;
}
.feature-item h4{font-size:1.1rem;margin-bottom:6px}
.feature-item p{color:var(--text-light);font-size:.9rem}

/* Product Detail */
.product-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:24px;
}
.product-card{
  background:var(--bg-white);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
  transition:transform .3s;
}
.product-card:hover{transform:translateY(-4px)}
.product-card .product-img{
  height:220px;background:var(--bg);
  display:flex;align-items:center;justify-content:center;
  font-size:3rem;color:var(--text-light);
}
.product-card .product-info{padding:24px}
.product-card h3{font-size:1.15rem;margin-bottom:8px}
.product-card p{color:var(--text-light);font-size:.88rem;margin-bottom:12px}
.product-card .tag{
  display:inline-block;padding:4px 10px;border-radius:20px;
  background:rgba(26,115,232,.08);color:var(--primary);
  font-size:.78rem;font-weight:600;margin-right:6px;
}

/* Breadcrumb */
.breadcrumb{
  padding:16px 0;font-size:.88rem;color:var(--text-light);
}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{color:var(--text);font-weight:500}

/* Page Banner */
.page-banner{
  background:linear-gradient(135deg,#0d1b3e,#1a3a6b);
  color:#fff;padding:60px 0;text-align:center;
}
.page-banner h1{font-size:2.2rem;margin-bottom:8px}
.page-banner p{opacity:.85;font-size:1.05rem}

/* Content Page */
.content-page{padding:60px 0}
.content-page .container{max-width:900px}
.content-page h2{font-size:1.6rem;margin:40px 0 16px}
.content-page h3{font-size:1.25rem;margin:28px 0 12px}
.content-page p{margin-bottom:16px;line-height:1.8}
.content-page ul{margin:12px 0 12px 24px}
.content-page li{margin-bottom:8px;list-style:disc}
.content-page table{
  width:100%;border-collapse:collapse;margin:20px 0;
}
.content-page th,.content-page td{
  border:1px solid var(--border);padding:12px 16px;text-align:left;
}
.content-page th{background:var(--bg);font-weight:600}

/* Contact */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:40px;
}
.contact-info h3{margin-bottom:16px}
.contact-info .info-item{
  display:flex;gap:12px;margin-bottom:16px;align-items:flex-start;
}
.contact-info .info-icon{font-size:1.3rem;color:var(--primary)}
.contact-form{background:var(--bg-white);padding:32px;border-radius:var(--radius);box-shadow:var(--shadow)}
.contact-form label{display:block;margin-bottom:6px;font-weight:500}
.contact-form input,.contact-form textarea{
  width:100%;padding:12px;border:1px solid var(--border);
  border-radius:var(--radius);font-size:1rem;margin-bottom:16px;
  font-family:inherit;
}
.contact-form textarea{height:120px;resize:vertical}

/* FAQ / Knowledge */
.faq-item{
  background:var(--bg-white);border-radius:var(--radius);
  box-shadow:var(--shadow);margin-bottom:16px;overflow:hidden;
}
.faq-question{
  padding:20px 24px;font-weight:600;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;
  border:none;background:none;width:100%;text-align:left;
  font-size:1.05rem;color:var(--text);
}
.faq-question::after{content:"+";font-size:1.3rem;color:var(--primary);transition:transform .3s}
.faq-item.open .faq-question::after{content:"−";transform:rotate(180deg)}
.faq-answer{display:none;padding:0 24px 20px;line-height:1.8;color:var(--text-light)}
.faq-item.open .faq-answer{display:block}

/* Footer */
.site-footer{
  background:#0d1b3e;color:rgba(255,255,255,.7);
  padding:60px 0 30px;
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:40px;margin-bottom:40px;
}
.footer-col h4{color:#fff;font-size:1.1rem;margin-bottom:16px}
.footer-col a{color:rgba(255,255,255,.6);display:block;padding:4px 0;font-size:.9rem}
.footer-col a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding-top:24px;text-align:center;font-size:.85rem;
}

/* --- Responsive --- */
@media (max-width: 768px){
  .hero-slide h1{font-size:1.8rem}
  .hero-slide p{font-size:1rem}
  .hero-slides{min-height:360px}
  .hero-slide{padding:60px 20px}
  .hero-arrow{width:36px;height:36px;font-size:1rem}
  .section{padding:50px 0}
  .section-title h2{font-size:1.5rem}
  .menu-toggle{display:flex}
  .main-nav{
    display:none;position:absolute;top:var(--nav-height);left:0;right:0;
    background:var(--bg-white);flex-direction:column;
    box-shadow:var(--shadow);padding:12px;z-index:999;
  }
  .main-nav.open{display:flex}
  .contact-grid{grid-template-columns:1fr}
  .hero .btn-group{flex-direction:column;align-items:center}
  .header-email span{display:none}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 480px){
  .container{padding:0 16px}
  .hero-slides{min-height:320px}
  .hero-slide{padding:50px 16px}
  .hero-slide h1{font-size:1.5rem}
  .hero-slide .btn-group{flex-direction:column;align-items:center}
  .hero-arrow{display:none}
  .page-banner h1{font-size:1.6rem}
  .cat-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
}

/* Animation */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}
.animate{animation:fadeUp .6s ease-out}