:root{
  --primary:#165dff;
  --primary-light:#4080ff;
  --primary-dark:#0e42d2;
  --water:#2f81ff;
  --water-grad-from:#1890ff;
  --water-grad-to:#0e42d2;
  --text-1:#1d2129;
  --text-2:#4e5969;
  --text-3:#86909c;
  --bg:#f5f7fa;
  --bg-card:#ffffff;
  --border:#e5e6eb;
  --shadow:0 6px 24px rgba(22,93,255,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:var(--text-1);background:#fff;line-height:1.6}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{width:min(1180px,92%);margin:0 auto}

/* 顶部导航 */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.brand .mark{width:38px;height:38px;background:linear-gradient(135deg,var(--water-grad-from),var(--water-grad-to));border-radius:9px;display:grid;place-items:center;color:#fff;font-weight:800}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:var(--text-2);font-size:15px;transition:.2s}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer}
@media(max-width:860px){.nav-toggle{display:block}.nav-links{position:fixed;left:0;right:0;top:64px;background:#fff;flex-direction:column;padding:16px;gap:16px;border-bottom:1px solid var(--border);transform:scaleY(0);transform-origin:top;transition:.2s}.nav-links.open{transform:scaleY(1)}}

/* Hero */
.hero{background:linear-gradient(135deg,#0a1a3f 0%,#0e42d2 55%,#165dff 100%);color:#fff;padding:96px 0 72px}
.hero .container{display:flex;align-items:center;gap:48px;flex-wrap:wrap}
.hero-text{flex:1;min-width:300px}
.hero h1{font-size:44px;line-height:1.2;margin-bottom:16px}
.hero h1 span{color:#7db0ff}
.hero p.slogan{font-size:17px;opacity:.92;margin-bottom:12px}
.hero ul{margin:16px 0 28px;list-style:none}
.hero li{font-size:15px;margin:8px 0;padding-left:22px;position:relative}
.hero li::before{content:"✓";position:absolute;left:0;color:#7db0ff;font-weight:700}
.hero-visual{flex:1;min-width:300px}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 26px;border-radius:8px;font-weight:600;font-size:15px;transition:.2s;cursor:pointer;border:none}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{background:#e8f0ff}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-cta{background:#ff7d00;color:#fff;border:1px solid #ff7d00}
.btn-cta:hover{background:#ff9c3f}
.nav-links a.nav-cta{color:#fff;background:var(--primary);padding:8px 16px;border-radius:6px;font-weight:600}
.nav-links a.nav-cta:hover{background:var(--primary-dark)}

/* 区段通用 */
.section{padding:76px 0}
.section.bg{background:var(--bg)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 48px}
.sec-head .kicker{color:var(--primary);font-weight:700;letter-spacing:2px;font-size:14px;margin-bottom:8px}
.sec-head h2{font-size:32px;margin-bottom:12px}
.sec-head p{color:var(--text-2)}

/* 特点卡片 */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:28px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .icon{width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,var(--water-grad-from),var(--water-grad-to));display:grid;place-items:center;color:#fff;font-size:24px;font-weight:800;margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:8px}
.card .big{font-size:30px;color:var(--primary);font-weight:800}
.card p{color:var(--text-2);font-size:14.5px}
.card .unit{font-size:13px;color:var(--text-3)}
@media(max-width:900px){.features{grid-template-columns:1fr}}

/* 技术对比表 */
.tbl{overflow-x:auto;background:#fff;border-radius:14px;border:1px solid var(--border);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{padding:14px 16px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--border)}
th{background:#f0f5ff;color:var(--primary-dark);font-weight:700;white-space:nowrap}
tr:last-child td{border-bottom:none}
td.hl{color:var(--primary);font-weight:700}
td.center{text-align:center}

/* 产品矩阵 */
.products{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product{background:#fff;border:1px solid var(--border);border-radius:14px;padding:26px;position:relative;transition:.25s}
.product:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.product .tag{position:absolute;top:18px;right:18px;background:#ffecec;color:#f53f3f;font-size:12px;padding:3px 9px;border-radius:20px;font-weight:600}
.product .tag.gold{background:#fff3e0;color:#ff7d00}
.product .tag.blue{background:#e8f0ff;color:var(--primary)}
.product .pn{font-size:22px;font-weight:700;color:var(--primary)}
.product .pname{color:var(--text-2);font-size:13.5px;margin:4px 0 16px}
.product dl{font-size:14px}
.product dt{color:var(--text-3);font-size:12.5px;margin-top:10px}
.product dd{font-weight:700;color:var(--text-1)}
@media(max-width:900px){.products{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.products{grid-template-columns:1fr}}

/* 应用场景 */
.scenes{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.scene{background:#fff;border:1px solid var(--border);border-radius:12px;padding:22px;text-align:center}
.scene .ico{font-size:34px;margin-bottom:12px}
.scene h3{font-size:17px;margin-bottom:8px}
.scene p{font-size:13px;color:var(--text-2)}
@media(max-width:900px){.scenes{grid-template-columns:1fr 1fr}}

/* 联系 */
.contact{background:linear-gradient(135deg,#0a1a3f,#0e42d2);color:#fff}
.contact .cth{max-width:800px;margin:0 auto}
.ct-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:8px;max-width:800px;margin-left:auto;margin-right:auto}
.ct-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-radius:12px;padding:26px;text-align:center}
.ct-card .lb{font-size:13px;opacity:.7;margin-bottom:8px}
.ct-card .val{font-size:19px;font-weight:700}
@media(max-width:700px){.ct-cards{grid-template-columns:1fr}}

/* 页脚 */
footer{background:#0a1633;color:#9fb0d4;font-size:13px;padding:28px 0}
footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}

/* 分页遮罩 */
.overlay{position:fixed;inset:0;background:rgba(10,22,51,.6);display:grid;place-items:center;z-index:200;padding:20px}
.overlay .modal{background:#fff;border-radius:14px;max-width:840px;width:100%;max-height:86vh;overflow:auto;padding:28px}
.overlay .modal h3{font-size:22px;color:var(--primary);margin-bottom:16px}
.modal-btns{display:flex;justify-content:flex-end;margin-top:18px}

/* 溯源 */
.hero.trace{background:linear-gradient(135deg,#10335f 0%,#0a1a3f 100%)}
.trace-box{max-width:520px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:14px;padding:28px;box-shadow:var(--shadow)}
.trace-input label{display:block;font-size:14px;color:var(--text-2);margin-bottom:8px;font-weight:600}
.trace-input input{width:100%;padding:12px 14px;font-size:16px;border:1px solid var(--border);border-radius:8px;margin-bottom:16px}
.trace-input input:focus{outline:none;border-color:var(--primary)}
.trace-input .btn{width:100%;background:var(--primary);color:#fff}
.trace-input .btn:hover{background:var(--primary-dark)}
.trace-result{border-top:1px dashed var(--border);margin-top:22px;padding-top:22px}