* { margin:0; padding:0; box-sizing:border-box; font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif; }

/* ===== 导航栏 ===== */
.header {
    width:100%;
    background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
    display:flex; flex-direction:column; align-items:center;
    position:sticky; top:0; z-index:999;
    box-shadow: 0 2px 15px rgba(0,0,0,0.15);
}
.logo { color:#fff; text-align:center; padding:18px 20px 6px; line-height:1.3; }
.logo .en-name { font-size:26px; font-weight:700; letter-spacing:2px; display:block; }
.logo .zh-name { font-size:13px; font-weight:normal; letter-spacing:0.5px; opacity:0.85; display:block; margin-top:3px; }

.nav { display:flex; align-items:center; gap:5px; padding:8px 0 14px; }
.nav a { color:#fff; text-decoration:none; font-size:16px; padding:8px 16px; border-radius:4px; transition:0.3s; }
.nav a:hover, .nav a.active { background:#ff7800; color:#fff; }

/* 语言下拉 — 仅点击触发 */
.lang-dropdown { position:relative; display:inline-block; }
.lang-btn {
    color:#fff; background:rgba(255,255,255,0.1);
    border:1px solid rgba(255,255,255,0.3);
    padding:8px 16px; border-radius:4px; cursor:pointer;
    font-size:16px; transition:0.3s; display:flex; align-items:center; gap:8px;
}
.lang-btn:hover { background:#ff7800; border-color:#ff7800; }
.lang-btn::after { content:"▾"; font-size:10px; margin-left:5px; }

/* 关键：默认隐藏，仅.open时显示 */
.lang-menu { 
    display:none !important; 
    position:absolute; right:0; top:100%; 
    background:#fff; min-width:160px; 
    box-shadow:0 8px 25px rgba(0,0,0,0.15); 
    border-radius:8px; overflow:hidden; z-index:1000; margin-top:5px; 
}
.lang-menu a { color:#333; padding:12px 20px; text-decoration:none; display:block; font-size:15px; transition:0.2s; }
.lang-menu a:hover { background:#f0f2f5; color:#0f3460; }
.lang-menu a.active { background:#0f3460; color:#fff; }

/* 点击触发展开 */
.lang-dropdown.open .lang-menu { display:block !important; }

/* ===== Hero ===== */
.banner {
    width:100%; min-height:580px;
    background: linear-gradient(135deg, #0f3460 0%, #1a4a7a 50%, #16213e 100%);
    display:flex; align-items:center; justify-content:center;
    position:relative; overflow:hidden;
}
.banner::before {
    content:""; position:absolute; top:-50%; left:-50%;
    width:200%; height:200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,120,0,0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 20%, rgba(255,255,255,0.03) 0%, transparent 50%);
}
.banner-text { position:relative; z-index:2; text-align:center; max-width:900px; padding:0 20px; }
.banner h1 { font-size:48px; color:#fff; margin-bottom:15px; font-weight:700; letter-spacing:1px; }
.banner .tagline { font-size:20px; color:rgba(255,255,255,0.85); line-height:1.8; margin-bottom:8px; letter-spacing:0.5px; }
.banner .btn-group { margin-top:40px; display:flex; gap:20px; justify-content:center; flex-wrap:wrap; }

/* ===== 按钮 ===== */
.btn-primary {
    padding:16px 42px; font-size:18px; font-weight:600;
    background: linear-gradient(135deg,#ff7800 0%,#ff9500 100%);
    color:#fff; border:none; border-radius:50px; cursor:pointer;
    transition:0.3s; box-shadow:0 4px 20px rgba(255,120,0,0.4);
    text-decoration:none; display:inline-block;
}
.btn-primary:hover { transform:translateY(-3px); box-shadow:0 8px 30px rgba(255,120,0,0.5); }
.btn-outline {
    padding:16px 42px; font-size:18px; font-weight:600;
    background:transparent; color:#fff; border:2px solid rgba(255,255,255,0.5);
    border-radius:50px; transition:0.3s; text-decoration:none; display:inline-block;
}
.btn-outline:hover { background:rgba(255,255,255,0.1); border-color:#fff; transform:translateY(-3px); }

/* ===== 通用 ===== */
.wrap { width:92%; max-width:1200px; margin:0 auto; padding:80px 0; }
.section-title { text-align:center; font-size:38px; color:#0f3460; margin-bottom:15px; font-weight:700; }
.section-subtitle { text-align:center; font-size:17px; color:#888; margin-bottom:50px; line-height:1.6; }
.section-title::after { content:""; display:block; width:70px; height:3px; background:linear-gradient(90deg,#ff7800,#ff9500); margin:12px auto 0; border-radius:2px; }
.section-light { background:#fff; }
.section-gray { background:#f7f8fa; }

/* ===== 业务卡片 ===== */
.service-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:25px; }
.service-card { text-align:center; padding:35px 20px 30px; background:#fff; border-radius:12px; box-shadow:0 2px 15px rgba(0,0,0,0.06); transition:0.3s; border:1px solid #f0f0f0; }
.service-card:hover { transform:translateY(-8px); box-shadow:0 12px 40px rgba(15,52,96,0.12); border-color:#ff7800; }
.service-card .icon { font-size:48px; margin-bottom:15px; display:block; }
.service-card h3 { color:#0f3460; margin-bottom:10px; font-size:20px; }
.service-card p { font-size:15px; color:#777; line-height:1.7; }

/* ===== 优势网格 ===== */
.advantage-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:30px; }
.advantage-item { text-align:center; padding:35px 25px; background:#fff; border-radius:12px; box-shadow:0 2px 12px rgba(0,0,0,0.04); transition:0.3s; border:1px solid #eee; }
.advantage-item:hover { transform:translateY(-5px); box-shadow:0 8px 25px rgba(15,52,96,0.1); border-color:rgba(255,120,0,0.3); }
.advantage-item .icon { font-size:40px; margin-bottom:12px; display:block; }
.advantage-item h4 { color:#0f3460; font-size:18px; margin-bottom:8px; }
.advantage-item p { font-size:14px; color:#888; line-height:1.6; }

/* ===== CTA ===== */
.cta-section { text-align:center; padding:70px 20px; background:linear-gradient(135deg,#0f3460 0%,#1a4a7a 100%); border-radius:12px; margin:40px 0; }
.cta-section h2 { color:#fff; font-size:34px; margin-bottom:15px; }
.cta-section p { color:rgba(255,255,255,0.8); font-size:18px; margin-bottom:30px; line-height:1.6; }

/* ===== 产品画廊 ===== */
.product-gallery { display:grid; grid-template-columns:repeat(auto-fill, minmax(220px,1fr)); gap:20px; }
.product-gallery img { width:100%; height:200px; object-fit:cover; border-radius:10px; transition:0.4s; cursor:pointer; }
.product-gallery img:hover { transform:scale(1.05); box-shadow:0 8px 25px rgba(0,0,0,0.15); }

/* ===== 公司介绍 ===== */
.about-content { max-width:900px; margin:0 auto; text-align:center; font-size:17px; color:#555; line-height:1.9; padding:0 20px; }

/* ===== 联系区块 ===== */
.contact-block { text-align:center; background:#fff; padding:60px; border-radius:12px; box-shadow:0 2px 15px rgba(0,0,0,0.05); max-width:800px; margin:0 auto; }
.contact-block h3 { font-size:28px; color:#0f3460; margin-bottom:25px; }
.contact-item { font-size:17px; line-height:2.8; color:#555; }
.contact-item a { color:#ff7800; text-decoration:none; }
.contact-item a:hover { text-decoration:underline; }

/* ===== 页脚 ===== */
.footer { width:100%; background:linear-gradient(135deg,#111 0%,#1a1a2e 100%); color:#aaa; padding:50px 5%; text-align:center; font-size:15px; line-height:2.2; }
.footer a { color:#ff7800; text-decoration:none; }
.footer a:hover { text-decoration:underline; }
.footer .footer-title { color:#fff; font-size:18px; font-weight:600; margin-bottom:8px; }

/* ===== 响应式 ===== */
@media (max-width:768px) {
    .header { height:auto; padding:0 3%; }
    .logo { font-size:20px; }
    .logo .en-name { font-size:22px; }
    .nav { flex-wrap:wrap; justify-content:center; }
    .nav a { font-size:13px; padding:6px 10px; }
    .banner { min-height:400px; }
    .banner h1 { font-size:30px; }
    .banner .tagline { font-size:16px; }
    .section-title { font-size:28px; }
    .advantage-grid { grid-template-columns:repeat(2,1fr); gap:15px; }
    .service-grid { grid-template-columns:repeat(2,1fr); }
    .wrap { padding:50px 0; }
    .cta-section h2 { font-size:24px; }
    .contact-block { padding:30px; }
}
@media (max-width:480px) {
    .advantage-grid { grid-template-columns:1fr; }
    .service-grid { grid-template-columns:1fr; }
}