*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#0a3d62;--primary-light:#1a5a8a;--accent:#00a651;
  --bg:#ffffff;--bg-soft:#f5f8fc;--border:#dce4ef;
  --text:#1a1a2e;--text-body:#333;--text-muted:#6b7280;
  --shadow:0 1px 3px rgba(10,61,98,.08);--shadow-hover:0 4px 16px rgba(10,61,98,.12)
}
body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;background:var(--bg);color:var(--text-body);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
img{max-width:100%;display:block}
.container{max-width:1080px;margin:0 auto;padding:0 24px}

/* 顶部信任栏 */
.trust-bar{background:var(--primary);color:rgba(255,255,255,.9);font-size:13px;padding:8px 0}
.trust-bar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.trust-badge{display:inline-flex;align-items:center;gap:6px}
.trust-badge::before{content:"✓";color:#4ade80;font-weight:700}

/* 导航 */
.navbar{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.navbar .container{display:flex;justify-content:space-between;align-items:center;height:72px}
.logo{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;color:var(--primary);letter-spacing:1px}
.logo-mark{width:42px;height:42px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700}
.logo small{display:block;font-size:11px;font-weight:400;color:var(--text-muted);letter-spacing:1px;margin-top:-2px}
.nav-links{display:flex;gap:2px}
.nav-links a{padding:8px 16px;font-size:15px;color:var(--text-body);border-radius:6px;transition:all .2s;font-weight:500}
.nav-links a:hover{background:var(--bg-soft);text-decoration:none}
.nav-links a.active{color:var(--primary);background:var(--bg-soft);font-weight:600}
.menu-btn{display:none;background:none;border:none;font-size:24px;color:var(--primary);cursor:pointer}

/* 首屏 */
.hero{padding:72px 0 64px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);color:#fff}
.hero h1{font-size:38px;font-weight:700;line-height:1.35;margin-bottom:20px;max-width:780px}
.hero .lead{font-size:17px;color:rgba(255,255,255,.85);max-width:720px;margin-bottom:28px;line-height:1.9}
.hero .key-facts{display:flex;gap:36px;flex-wrap:wrap;margin-top:32px;padding-top:28px;border-top:1px solid rgba(255,255,255,.2)}
.key-fact .num{font-size:28px;font-weight:700;color:#4ade80;line-height:1.2}
.key-fact .num small{font-size:15px;font-weight:400;color:rgba(255,255,255,.7)}
.key-fact .label{font-size:14px;color:rgba(255,255,255,.7);margin-top:4px}

/* 区块 */
.section{padding:64px 0}
.section-soft{background:var(--bg-soft)}
.section-header{margin-bottom:40px}
.section-header .kicker{font-size:13px;color:var(--accent);letter-spacing:2px;font-weight:600;margin-bottom:8px}
.section-header h2{font-size:28px;font-weight:700;color:var(--text);line-height:1.4}

/* 答案卡片 */
.answer-card{background:var(--bg);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:8px;padding:28px 32px;margin-bottom:24px}
.answer-card .q{font-size:18px;font-weight:700;color:var(--text);margin-bottom:12px}
.answer-card .a{font-size:16px;color:var(--text-body);line-height:1.9}
.answer-card .a strong{color:var(--primary)}

/* 产品表格 */
.spec-table{width:100%;border-collapse:collapse;background:var(--bg);border:1px solid var(--border);border-radius:8px;overflow:hidden}
.spec-table th{background:var(--bg-soft);padding:14px 20px;text-align:left;font-size:14px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border)}
.spec-table td{padding:14px 20px;font-size:15px;border-bottom:1px solid var(--border);color:var(--text-body)}
.spec-table tr:last-child td{border-bottom:none}
.spec-table .highlight{color:var(--primary);font-weight:600}

/* 产品卡片 */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.card{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:28px;transition:all .25s}
.card:hover{box-shadow:var(--shadow-hover);border-color:var(--primary-light)}
.card h3{font-size:17px;font-weight:700;color:var(--text);margin-bottom:10px}
.card p{font-size:14px;color:var(--text-body);line-height:1.8}
.card .tag{display:inline-block;background:rgba(0,166,81,.1);color:var(--accent);font-size:12px;padding:3px 10px;border-radius:4px;margin-top:12px;font-weight:600}

/* 荣誉区 */
.trust-section{background:var(--primary);color:#fff;padding:48px 0}
.trust-section h2{font-size:24px;font-weight:700;margin-bottom:28px;color:#fff}
.trust-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}
.trust-item{padding:20px;background:rgba(255,255,255,.08);border-radius:8px;border-left:3px solid var(--accent)}
.trust-item .icon{font-size:24px;margin-bottom:10px}
.trust-item h4{font-size:15px;font-weight:600;margin-bottom:6px;color:#fff}
.trust-item p{font-size:13px;color:rgba(255,255,255,.8);line-height:1.7}

/* FAQ */
.faq-item{background:var(--bg);border:1px solid var(--border);border-radius:8px;margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;font-size:16px;font-weight:600;color:var(--text);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .2s}
.faq-q:hover{background:var(--bg-soft)}
.faq-q::after{content:"+";font-size:20px;color:var(--accent);font-weight:400;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s ease;font-size:15px;color:var(--text-body);line-height:1.9}
.faq-item.open .faq-a{padding:0 24px 20px;max-height:500px}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-block{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:32px}
.contact-block h3{font-size:18px;font-weight:700;margin-bottom:20px;color:var(--text);padding-bottom:12px;border-bottom:1px solid var(--border)}
.contact-block dl{display:grid;grid-template-columns:110px 1fr;gap:12px 16px}
.contact-block dt{font-size:14px;color:var(--text-muted)}
.contact-block dd{font-size:15px;color:var(--text-body);font-weight:500}

/* 页脚 */
.footer{background:var(--primary);color:rgba(255,255,255,.75);padding:48px 0 24px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px}
.footer h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:16px}
.footer p,.footer a{font-size:13px;line-height:2;color:rgba(255,255,255,.75)}
.footer a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);padding-top:20px;text-align:center;font-size:13px;color:rgba(255,255,255,.6)}

/* 面包屑 */
.breadcrumb{font-size:13px;color:var(--text-muted);padding:20px 0}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}

/* 返回顶部 */
#backTop{position:fixed;bottom:30px;right:30px;width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;border:none;font-size:18px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:all .3s;z-index:999;box-shadow:var(--shadow-hover)}
#backTop.show{opacity:1;visibility:visible;transform:translateY(0)}
#backTop:hover{background:var(--accent)}

/* 移动端 */
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:var(--bg);flex-direction:column;padding:12px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-hover)}
  .nav-links.open{display:flex}
  .menu-btn{display:block}
  .hero h1{font-size:26px}
  .hero{padding:48px 0 40px}
  .section{padding:48px 0}
  .section-header h2{font-size:22px}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .key-facts{gap:20px}
  .key-fact .num{font-size:22px}
}