/* ===== CSS Variables & Reset ===== */
:root {
  --primary: #1a3a5c;
  --primary-dark: #0f2440;
  --accent: #e8a838;
  --accent-hover: #d4952e;
  --text: #333;
  --text-light: #666;
  --bg: #f8f9fa;
  --white: #fff;
  --border: #e0e0e0;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 8px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
a{text-decoration:none;color:inherit;transition:var(--transition)}
img{max-width:100%;height:auto}
ul{list-style:none}

/* ===== Header ===== */
.header{background:var(--white);box-shadow:0 2px 8px rgba(0,0,0,0.06);position:sticky;top:0;z-index:1000}
.header-top{background:var(--primary-dark);color:#ccc;font-size:13px;padding:6px 0}
.header-top .container{display:flex;justify-content:space-between;align-items:center}
.header-top a{color:#ccc;margin-left:15px}
.header-top a:hover{color:var(--accent)}
.lang-switch a{padding:3px 10px;border-radius:3px;font-size:12px}
.lang-switch a.active{background:var(--accent);color:#fff}

.header-main{padding:0}
.header-main .container{display:flex;justify-content:space-between;align-items:center;height:80px}
.logo{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;color:var(--primary)}
.logo-icon{width:48px;height:48px;background:var(--accent);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:20px}
.logo span{font-size:13px;color:var(--text-light);font-weight:400;display:block}

.nav{display:flex;gap:0}
.nav a{padding:28px 20px;font-size:15px;font-weight:500;color:var(--text);position:relative;display:block}
.nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:3px;background:var(--accent);transition:var(--transition);transform:translateX(-50%)}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav a:hover::after,.nav a.active::after{width:60%}

.mobile-toggle{display:none;font-size:28px;background:none;border:none;cursor:pointer;color:var(--primary)}
.mobile-lang-switch{display:none}

/* ===== Hero Banner ===== */
.hero{position:relative;height:560px;background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 100%);overflow:hidden;display:flex;align-items:center}
.hero::before{content:'';position:absolute;top:0;right:0;width:60%;height:100%;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600"><circle cx="600" cy="300" r="280" fill="rgba(232,168,56,0.08)"/><circle cx="700" cy="150" r="150" fill="rgba(255,255,255,0.03)"/></svg>') center/cover}
.hero-content{position:relative;z-index:2;max-width:700px;padding:0 40px}
.hero h1{color:#fff;font-size:48px;line-height:1.2;margin-bottom:20px}
.hero h1 em{color:var(--accent);font-style:normal}
.hero p{color:rgba(255,255,255,0.8);font-size:18px;margin-bottom:35px;line-height:1.8}
.hero-stats{display:flex;gap:40px;margin-top:30px}
.hero-stat{text-align:center}
.hero-stat .num{font-size:42px;font-weight:800;color:var(--accent)}
.hero-stat .label{font-size:13px;color:rgba(255,255,255,0.7);margin-top:4px}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:12px 32px;border-radius:var(--radius);font-weight:600;font-size:15px;cursor:pointer;transition:var(--transition);border:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-2px)}
.btn-outline{border:2px solid rgba(255,255,255,0.4);color:#fff;background:transparent}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)}
.btn-sm{padding:8px 20px;font-size:13px}

/* ===== Container ===== */
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* ===== Section ===== */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:50px}
.section-header h2{font-size:34px;color:var(--primary);margin-bottom:10px}
.section-header p{color:var(--text-light);font-size:16px}
.section-header .line{width:60px;height:3px;background:var(--accent);margin:15px auto 0}

/* ===== About Preview ===== */
.about-preview{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-text h3{font-size:28px;color:var(--primary);margin-bottom:20px}
.about-text p{color:var(--text-light);line-height:1.9;margin-bottom:20px}
.about-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.about-card{background:var(--white);padding:25px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;transition:var(--transition)}
.about-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,0.12)}
.about-card .icon{font-size:36px;margin-bottom:10px}
.about-card h4{font-size:15px;color:var(--primary);margin-bottom:8px}
.about-card p{font-size:13px;color:var(--text-light)}

/* ===== Product Grid ===== */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.product-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.product-card:hover{transform:translateY(-8px);box-shadow:0 12px 30px rgba(0,0,0,0.15)}
.product-card .img-wrap{height:220px;background:linear-gradient(135deg,#e8eef5,#d5dde8);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.product-card .img-wrap img{width:100%;height:100%;object-fit:cover}
.product-card .img-wrap .placeholder{font-size:48px;color:var(--primary);opacity:0.3}
.product-card .info{padding:20px}
.product-card h3{font-size:17px;color:var(--primary);margin-bottom:8px}
.product-card p{font-size:13px;color:var(--text-light);line-height:1.6}
.product-card .view-more{display:inline-block;margin-top:12px;color:var(--accent);font-weight:600;font-size:14px}
.product-card .view-more:hover{color:var(--accent-hover)}

/* ===== Category Filter ===== */
.cat-filter{display:flex;gap:10px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}
.cat-filter a{padding:8px 22px;border-radius:20px;background:var(--white);color:var(--text);font-size:14px;border:1px solid var(--border);transition:var(--transition)}
.cat-filter a:hover,.cat-filter a.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ===== Why Choose ===== */
.why-section{background:var(--primary-dark);color:#fff}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.why-card{text-align:center;padding:30px 20px}
.why-card .icon{font-size:48px;margin-bottom:15px}
.why-card h4{font-size:17px;margin-bottom:10px;color:var(--accent)}
.why-card p{font-size:14px;color:rgba(255,255,255,0.7);line-height:1.7}

/* ===== News ===== */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.news-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.news-card:hover{transform:translateY(-5px)}
.news-card .img-wrap{height:180px;background:linear-gradient(135deg,#e8eef5,#d5dde8);display:flex;align-items:center;justify-content:center}
.news-card .img-wrap img{width:100%;height:100%;object-fit:cover}
.news-card .info{padding:20px}
.news-card .date{font-size:12px;color:var(--text-light);margin-bottom:8px}
.news-card h3{font-size:16px;color:var(--primary);line-height:1.5;margin-bottom:8px}
.news-card p{font-size:13px;color:var(--text-light);line-height:1.6}

/* ===== Contact / Inquiry Form ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px}
.contact-info-item{display:flex;gap:15px;margin-bottom:25px;align-items:flex-start}
.contact-info-item .icon{width:45px;height:45px;background:var(--accent);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff;flex-shrink:0}
.contact-info-item h4{font-size:15px;margin-bottom:4px}
.contact-info-item p{font-size:14px;color:var(--text-light)}

.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;font-weight:500;margin-bottom:6px;color:var(--text)}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;transition:var(--transition);font-family:inherit}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(232,168,56,0.15)}
.form-group textarea{height:120px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}

.success-msg{background:#d4edda;color:#155724;padding:15px 20px;border-radius:var(--radius);margin-bottom:20px;font-size:14px}

/* ===== Footer ===== */
.footer{background:var(--primary-dark);color:rgba(255,255,255,0.7);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer h4{color:#fff;font-size:16px;margin-bottom:20px;position:relative;padding-bottom:10px}
.footer h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--accent)}
.footer p{font-size:14px;line-height:1.8;margin-bottom:10px}
.footer a{color:rgba(255,255,255,0.7);font-size:14px;display:block;margin-bottom:8px}
.footer a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding:20px 0;text-align:center;font-size:13px}

/* ===== About Page ===== */
.page-banner{height:280px;background:linear-gradient(135deg,var(--primary-dark),var(--primary));display:flex;align-items:center;justify-content:center;color:#fff;text-align:center}
.page-banner h1{font-size:38px;margin-bottom:10px}
.page-banner p{font-size:16px;opacity:0.7}

.about-full{line-height:2;font-size:16px;color:var(--text-light)}
.about-full p{margin-bottom:20px}

/* ===== Product Detail ===== */
.product-detail{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}
.product-detail .img-wrap{height:400px;background:linear-gradient(135deg,#e8eef5,#d5dde8);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;overflow:hidden}
.product-detail .img-wrap img{width:100%;height:100%;object-fit:cover;border-radius:var(--radius)}
.product-detail .detail-info h1{font-size:28px;color:var(--primary);margin-bottom:20px}
.product-detail .detail-info p{line-height:1.9;color:var(--text-light);margin-bottom:25px}

/* ===== About Video ===== */
.about-video{display:flex;align-items:center;justify-content:center}
.video-wrapper{width:100%;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#000;aspect-ratio:16/9;position:relative}
.video-wrapper video{width:100%;height:100%;object-fit:cover}
.video-placeholder{width:100%;height:100%;background:linear-gradient(135deg,#1a3a5c,#0f2440);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;text-align:center;cursor:pointer;aspect-ratio:16/9}
.video-placeholder .play-icon{width:80px;height:80px;border:3px solid rgba(255,255,255,0.6);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:32px;margin-bottom:20px;transition:var(--transition)}
.video-placeholder:hover .play-icon{border-color:var(--accent);color:var(--accent);transform:scale(1.1)}
.video-placeholder p{font-size:18px;font-weight:600;margin-bottom:6px}
.video-placeholder span{font-size:13px;opacity:0.5}

/* ===== Exhibition Grid ===== */
.exhibition-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.exhibition-card{display:block;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.exhibition-card.large{grid-column:1/2;grid-row:1/3}
.exhibition-card:hover{transform:translateY(-5px);box-shadow:0 12px 30px rgba(0,0,0,0.15)}
.exh-img{position:relative;width:100%;height:100%;min-height:220px;background:linear-gradient(135deg,#e8eef5,#d5dde8);display:flex;align-items:center;justify-content:center;overflow:hidden}
.exhibition-card.large .exh-img{min-height:460px}
.exh-img img{width:100%;height:100%;object-fit:cover;position:absolute;top:0;left:0}
.exh-overlay{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,0.75));padding:25px;color:#fff}
.exh-overlay h3{font-size:18px;margin-bottom:6px}
.exh-overlay p{font-size:13px;opacity:0.8;margin-bottom:8px}
.exh-overlay .view-more{color:var(--accent);font-size:14px;font-weight:600}

/* Exhibition List Page */
.exh-list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.exh-list-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.exh-list-card:hover{transform:translateY(-5px)}
.exh-list-card .exh-thumb{height:240px;background:linear-gradient(135deg,#e8eef5,#d5dde8);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.exh-list-card .exh-thumb img{width:100%;height:100%;object-fit:cover}
.exh-list-card .info{padding:20px}
.exh-list-card h3{font-size:17px;color:var(--primary);margin-bottom:8px}
.exh-list-card p{font-size:13px;color:var(--text-light);line-height:1.6}

/* Exhibition Detail Gallery */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:30px}
.gallery-item{border-radius:var(--radius);overflow:hidden;cursor:pointer;aspect-ratio:4/3;background:linear-gradient(135deg,#e8eef5,#d5dde8);display:flex;align-items:center;justify-content:center;position:relative;transition:var(--transition)}
.gallery-item:hover{transform:scale(1.03);box-shadow:0 8px 20px rgba(0,0,0,0.15)}
.gallery-item img{width:100%;height:100%;object-fit:cover;position:absolute;top:0;left:0}
.gallery-item .caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,0.6));color:#fff;padding:10px;font-size:12px}

/* Lightbox */
.lightbox{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.9);z-index:9999;align-items:center;justify-content:center;cursor:pointer}
.lightbox.active{display:flex}
.lightbox img{max-width:90%;max-height:85vh;border-radius:8px;box-shadow:0 10px 40px rgba(0,0,0,0.5)}
.lightbox-close{position:absolute;top:20px;right:30px;color:#fff;font-size:36px;cursor:pointer;z-index:10000}

/* ===== Mobile ===== */
@media(max-width:768px){
  .header-top{display:none}
  .header-main .container{height:60px}
  .logo{font-size:18px}
  .logo-icon{width:38px;height:38px;font-size:16px}
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--white);flex-direction:column;box-shadow:0 8px 20px rgba(0,0,0,0.1);z-index:999}
  .nav.open{display:flex}
  .nav a{padding:15px 20px;border-bottom:1px solid var(--border)}
  .nav a::after{display:none}
  .mobile-toggle{display:block}
  .mobile-lang-switch{display:flex;gap:8px;padding:15px 20px;border-bottom:1px solid var(--border);flex-wrap:wrap}
  .mobile-lang-switch a{padding:6px 14px;border-radius:4px;font-size:13px;font-weight:500;background:var(--bg);color:var(--text);border:1px solid var(--border)}
  .mobile-lang-switch a.active{background:var(--accent);color:#fff;border-color:var(--accent)}

  .hero{height:auto;padding:60px 0}
  .hero h1{font-size:28px}
  .hero p{font-size:15px}
  .hero-stats{gap:20px}
  .hero-stat .num{font-size:28px}

  .about-preview{grid-template-columns:1fr}
  .product-grid{grid-template-columns:1fr 1fr}
  .why-grid{grid-template-columns:1fr 1fr}
  .news-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .product-detail{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .exhibition-grid{grid-template-columns:1fr}
  .exhibition-card.large{grid-column:auto;grid-row:auto}
  .exhibition-card.large .exh-img{min-height:220px}
  .exh-list-grid{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:1fr 1fr}

  .section{padding:50px 0}
  .section-header h2{font-size:24px}
}
@media(max-width:480px){
  .product-grid{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .about-cards{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:1fr}
}