* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; color: #333; line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 滚动渐入动画 */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94); }
.reveal.active { opacity: 1; transform: translateY(0); }

/* === 2. 顶部通知栏 === */
.top-bar { background: linear-gradient(90deg, #0052d9, #007bff); color: #fff; text-align: center; padding: 8px 0; font-size: 13px; letter-spacing: 1px; }

/* === 3. 导航栏 === */
header { background: #fff; padding: 15px 0; box-shadow: 0 2px 15px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; }
.nav-wrap { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 24px; font-weight: 800; color: #0052d9; }
.nav-links a { margin-left: 25px; font-size: 15px; color: #555; position: relative; }
.nav-links a:hover { color: #0052d9; }
.btn-consult { background: #0052d9; color: #fff !important; padding: 8px 24px; border-radius: 20px; font-size: 14px; box-shadow: 0 4px 10px rgba(0,82,217,0.3); }
.btn-consult:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(0,82,217,0.4); }

/* === 4. Hero 首屏 === */
.hero { background: linear-gradient(135deg, #001f3f 0%, #003366 50%, #0052d9 100%); color: #fff; padding: 100px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%); animation: rotateBg 20s linear infinite; }
@keyframes rotateBg { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.hero h1 { font-size: 44px; margin-bottom: 20px; font-weight: 800; position: relative; z-index: 1; text-shadow: 0 2px 10px rgba(0,0,0,0.2); }
.hero p { font-size: 18px; opacity: 0.9; margin-bottom: 40px; position: relative; z-index: 1; }
.hero-btns { position: relative; z-index: 1; }
.hero-btns a { display: inline-block; padding: 16px 45px; border-radius: 30px; font-size: 16px; font-weight: bold; margin: 0 10px; transition: all 0.3s; }
.btn-primary { background: #fff; color: #0052d9; box-shadow: 0 5px 20px rgba(255,255,255,0.3); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(255,255,255,0.4); }
.btn-outline { border: 2px solid rgba(255,255,255,0.6); color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

/* === 5. 核心优势 (8个) === */
.advantages { padding: 80px 0; background: #f8f9fa; }
.section-title { text-align: center; font-size: 32px; margin-bottom: 50px; color: #222; position: relative; }
.section-title::after { content: ''; display: block; width: 60px; height: 4px; background: #0052d9; margin: 15px auto 0; border-radius: 2px; }
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.adv-card { background: #fff; padding: 30px 20px; border-radius: 12px; text-align: center; box-shadow: 0 5px 15px rgba(0,0,0,0.03); transition: all 0.4s; border-bottom: 3px solid transparent; }
.adv-card:hover { transform: translateY(-8px); box-shadow: 0 10px 25px rgba(0,82,217,0.1); border-bottom-color: #0052d9; }
.adv-icon { font-size: 36px; margin-bottom: 15px; display: block; color: #0052d9; }
.adv-card h3 { font-size: 18px; margin-bottom: 10px; color: #333; }
.adv-card p { font-size: 13px; color: #888; line-height: 1.5; }

/* === 6. 热销系统 === */
.systems { padding: 80px 0; }
.sys-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.sys-card { border: 1px solid #eee; border-radius: 12px; padding: 35px 30px; transition: all 0.4s; position: relative; overflow: hidden; }
.sys-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: linear-gradient(90deg, #0052d9, #00c6ff); transform: scaleX(0); transition: transform 0.4s; transform-origin: left; }
.sys-card:hover::before { transform: scaleX(1); }
.sys-card:hover { box-shadow: 0 10px 30px rgba(0,0,0,0.08); transform: translateY(-5px); }
.sys-tag { display: inline-block; background: #e6f7ff; color: #0052d9; padding: 3px 10px; border-radius: 4px; font-size: 12px; margin-bottom: 15px; }
.sys-card h3 { font-size: 20px; margin-bottom: 12px; color: #222; }
.sys-card p { font-size: 14px; color: #666; margin-bottom: 20px; }
.sys-link { color: #0052d9; font-weight: bold; font-size: 14px; }
.sys-link:hover { text-decoration: underline; }

/* === 7. 合作流程 (2行 x 4列) === */
.process { padding: 80px 0; background: #f8f9fa; }
.proc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.proc-step { background: #fff; padding: 30px 20px; border-radius: 10px; text-align: center; position: relative; box-shadow: 0 3px 10px rgba(0,0,0,0.03); }
.proc-num { width: 40px; height: 40px; background: #0052d9; color: #fff; border-radius: 50%; line-height: 40px; font-weight: bold; margin: 0 auto 15px; font-size: 16px; }
.proc-step h4 { font-size: 16px; margin-bottom: 8px; color: #333; }
.proc-step p { font-size: 13px; color: #888; }
/* 连接线效果 (仅桌面端) */
@media (min-width: 769px) {
    .proc-step:not(:nth-child(4n))::after { content: ''; position: absolute; top: 50px; right: -12px; width: 20px; height: 2px; background: #ddd; }
}

/* === 8. 售后服务 (4大保障) === */
.service { padding: 80px 0; }
.serv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.serv-card { text-align: center; padding: 40px 20px; border-radius: 12px; background: #fff; box-shadow: 0 5px 20px rgba(0,0,0,0.05); transition: all 0.4s; border-top: 4px solid transparent; }
.serv-card:hover { transform: translateY(-8px); box-shadow: 0 10px 30px rgba(0,82,217,0.1); border-top-color: #0052d9; }
.serv-icon { font-size: 48px; color: #0052d9; margin-bottom: 20px; display: block; }
.serv-card h3 { font-size: 20px; margin-bottom: 12px; color: #222; }
.serv-card p { font-size: 14px; color: #666; line-height: 1.6; }

/* === 9. 数据实证 === */
.stats { padding: 60px 0; background: #0052d9; color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat-item h2 { font-size: 42px; font-weight: bold; margin-bottom: 10px; }
.stat-item p { font-size: 16px; opacity: 0.9; }

/* === 10. 成功案例 === */
.cases { padding: 80px 0; }
        .case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 370px)); gap: 25px; }
        .case-card { background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 3px 15px rgba(0,0,0,0.06); transition: all 0.3s; border: 1px solid #eef2f7; }
        .case-card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,102,204,0.12); }
        .case-img { height: 180px; background: linear-gradient(135deg, #e6f2ff, #cce5ff); display: flex; align-items: center; justify-content: center; color: #0066cc; font-size: 14px; }
        .case-content { padding: 20px; }
        .case-tag { display: inline-block; background: #e6f7ff; color: #0066cc; padding: 2px 10px; border-radius: 4px; font-size: 12px; margin-bottom: 10px; }
        .case-content h3 { font-size: 16px; margin-bottom: 8px; color: #1a1a2e; }
        .case-content p { font-size: 13px; color: #666; line-height: 1.6; }

/* === 11. 关于我们 === */
.about { padding: 80px 0; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-text h3 { font-size: 24px; margin-bottom: 20px; color: #222; }
.about-text p { font-size: 15px; color: #666; margin-bottom: 15px; line-height: 1.8; }
.about-img { background: linear-gradient(135deg, #0052d9 0%, #00c6ff 100%); height: 300px; border-radius: 12px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 20px; }

/* === 12. 新闻动态 === */
.news { padding: 80px 0; background: #f8f9fa; }
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.news-col h3 { font-size: 20px; margin-bottom: 20px; color: #222; border-left: 4px solid #0052d9; padding-left: 12px; }
.news-item { padding: 15px 0; border-bottom: 1px dashed #eee; }
.news-item:last-child { border-bottom: none; }
.news-date { font-size: 13px; color: #999; margin-bottom: 5px; }
.news-item a { font-size: 15px; color: #333; display: block; }
.news-item a:hover { color: #0052d9; }

/* === 13. Footer === */
footer { background: #111; color: #aaa; padding: 50px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
.footer-col a { display: block; color: #aaa; font-size: 14px; margin-bottom: 10px; }
.footer-col a:hover { color: #007bff; }
.copyright { text-align: center; padding-top: 30px; border-top: 1px solid #333; font-size: 13px; }

/* === 响应式 === */
@media (max-width: 768px) {
    .hero h1 { font-size: 28px; }
    .adv-grid, .proc-grid, .serv-grid, .stats-grid, .footer-grid, .case-grid, .news-grid { 
        grid-template-columns: repeat(2, 1fr);
        gap:10px;
    }
    .sys-grid,.case-grid,.about-content {
        grid-template-columns:1fr;
    }
    .nav-links { display: none; }
    .proc-step::after { display: none !important; }
    .stat-item h2 { font-size: 28px; }
    .about-img { display:none; }
}
@media (max-width: 480px) {
    .adv-grid, .proc-grid, .serv-grid, .stats-grid { 
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .sys-grid,.case-grid,.about-content {
        grid-template-columns:1fr;
    }
    .about-img { display:none; }

}