/* ============ 设计令牌 ============ */
:root{
  --paper:#F1F5F6;
  --surface:#FFFFFF;
  --surface-2:#E9F0F1;
  --ink:#0C1A1F;
  --ink-2:#33474D;
  --ink-3:#6A7B80;
  --line:#D3DEDF;
  --line-2:#BECBCD;
  --teal:#0B7681;
  --teal-deep:#0A5A63;
  --aqua:#0FA0AC;
  --wash:#DDEEEF;
  --alert:#C13A20;
  --alert-wash:#F6E4DF;
  --amber:#B26B12;
  --shadow-sm:0 1px 2px rgba(12,26,31,.05);
  --shadow:0 1px 2px rgba(12,26,31,.05),0 18px 36px -24px rgba(12,26,31,.30);
  --r:16px;
  --r-sm:10px;
  --maxw:1200px;
  --display:'Space Grotesk','PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:'PingFang SC','Microsoft YaHei','Hiragino Sans GB',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.72;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.22;letter-spacing:-.01em;}
p{margin:0;}
img,svg{display:block;max-width:100%;}
::selection{background:var(--teal);color:#fff;}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(20px,5vw,52px);}

/* eyebrow / mono 小标签 */
.eyebrow{
  font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.18em;
  text-transform:uppercase;color:var(--teal);display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--teal);display:inline-block;}
.mono{font-family:var(--mono);}

/* 通用 section */
.section{padding-block:clamp(64px,8vw,112px);position:relative;}
.section--alt{background:var(--surface-2);}
.section--ink{background:var(--ink);color:#DCE7E8;}
.s-head{max-width:760px;margin-bottom:clamp(36px,5vw,56px);}
.s-head h2{
  font-size:clamp(26px,4.4vw,42px);margin-top:16px;color:var(--ink);
  letter-spacing:-.02em;
}
.section--ink .s-head h2{color:#fff;}
.s-head .lead{margin-top:18px;color:var(--ink-2);font-size:clamp(15px,1.6vw,17px);line-height:1.8;}
.section--ink .s-head .lead{color:#AFC2C4;}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:9px;}
.chip{
  font-family:var(--mono);font-size:12.5px;letter-spacing:.02em;color:var(--ink-2);
  background:var(--surface);border:1px solid var(--line);border-radius:100px;
  padding:7px 14px;white-space:nowrap;
}
.chip--teal{color:var(--teal-deep);background:var(--wash);border-color:transparent;}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-family:var(--display);font-weight:600;
  font-size:15px;padding:13px 22px;border-radius:100px;border:1.5px solid transparent;
  cursor:pointer;transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn svg{width:16px;height:16px;}
.btn--primary{background:var(--teal);color:#fff;}
.btn--primary:hover{background:var(--teal-deep);transform:translateY(-2px);}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-2);}
.btn--ghost:hover{border-color:var(--teal);color:var(--teal-deep);transform:translateY(-2px);}
.section--ink .btn--ghost{color:#fff;border-color:rgba(255,255,255,.28);}
.section--ink .btn--ghost:hover{border-color:#fff;background:rgba(255,255,255,.08);}

/* ============ NAV ============ */
.nav{
  position:sticky;top:0;z-index:60;background:rgba(241,245,246,.82);
  backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:20px;}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--display);font-weight:600;font-size:16px;color:var(--ink);white-space:nowrap;}
.brand .mark{width:30px;height:30px;flex:none;}
.brand small{font-family:var(--mono);font-weight:400;font-size:10.5px;letter-spacing:.14em;color:var(--ink-3);display:block;text-transform:uppercase;margin-top:1px;}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;color:var(--ink-2);}
.nav-links a{position:relative;padding:4px 0;transition:color .16s;}
.nav-links a:hover,.nav-links a.active{color:var(--teal-deep);}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--teal);border-radius:2px;}
.nav-cta{display:flex;align-items:center;gap:14px;}
.nav-toggle{display:none;background:none;border:1px solid var(--line-2);border-radius:8px;width:40px;height:36px;cursor:pointer;color:var(--ink);align-items:center;justify-content:center;}
.nav-toggle svg{width:20px;height:20px;}

/* ============ HERO ============ */
.hero{position:relative;padding-top:clamp(48px,7vw,84px);padding-bottom:clamp(40px,6vw,72px);overflow:hidden;}
.hero::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(60% 55% at 82% 8%,rgba(15,160,172,.10),transparent 60%),
    radial-gradient(40% 40% at 10% 90%,rgba(11,118,129,.08),transparent 60%);
  pointer-events:none;
}
.hero .wrap{position:relative;z-index:1;}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:clamp(32px,5vw,64px);align-items:center;}
.hero h1{
  font-size:clamp(32px,5.2vw,58px);margin-top:22px;letter-spacing:-.028em;line-height:1.12;color:var(--ink);
}
.hero .sub{margin-top:22px;font-size:clamp(15px,1.7vw,18px);color:var(--ink-2);line-height:1.82;max-width:600px;}
.hero-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px;}
.stat{
  border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:12px 16px;min-width:130px;flex:1 1 auto;
}
.stat .k{font-family:var(--display);font-weight:700;font-size:19px;color:var(--teal-deep);letter-spacing:-.01em;}
.stat .v{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.04em;margin-top:2px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px;}

/* 信封：hero 流程示意图 */
.flowcard{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);
  padding:22px 22px 18px;
}
.flow-legend{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px;}
.fl{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11.5px;color:var(--ink-2);
  background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:6px 10px;flex:1 1 0;min-width:0;}
.fl b{font-weight:600;color:var(--teal-deep);}
.fl .n{font-family:var(--display);font-weight:700;color:#fff;background:var(--teal);width:18px;height:18px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;font-size:11px;flex:none;}
.flow-svg{width:100%;height:auto;}
.flow-foot{display:flex;justify-content:space-between;gap:10px;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line-2);font-family:var(--mono);font-size:11px;color:var(--ink-3);flex-wrap:wrap;}
.flow-foot b{color:var(--teal-deep);font-weight:600;}

/* svg 动画 */
.pipe{fill:none;stroke:var(--line-2);stroke-width:5;stroke-linecap:round;}
.flow-line{fill:none;stroke:var(--aqua);stroke-width:3;stroke-linecap:round;stroke-dasharray:5 12;animation:flow 1.3s linear infinite;}
@keyframes flow{to{stroke-dashoffset:-34;}}
.node{fill:var(--ink);}
.ring{fill:none;stroke:var(--teal);stroke-width:2;transform-box:fill-box;transform-origin:center;animation:pulse 2.6s ease-out infinite;}
.ring.d1{animation-delay:.5s;}.ring.d2{animation-delay:1s;}.ring.d3{animation-delay:1.5s;}
@keyframes pulse{0%{r:7;opacity:.9;}70%{r:16;opacity:0;}100%{opacity:0;}}
.station{fill:var(--wash);stroke:var(--teal);stroke-width:2;}
.drop{fill:var(--aqua);}

/* ============ 概述：适用对象/监测点位 ============ */
.def-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:36px;}
.def{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px;}
.def h4{font-family:var(--mono);font-weight:500;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);margin-bottom:16px;}
.def h4 .cn{font-family:var(--sans);font-weight:600;font-size:15px;letter-spacing:0;color:var(--ink);text-transform:none;margin-left:10px;}

/* ============ 产品卡 ============ */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.pcard{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px;
  display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;position:relative;overflow:hidden;
}
.pcard::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(var(--teal),var(--aqua));opacity:0;transition:opacity .2s;}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent;}
.pcard:hover::before{opacity:1;}
.pcard .model{font-family:var(--display);font-weight:700;font-size:22px;color:var(--ink);letter-spacing:-.01em;}
.pcard .pname{font-size:14px;color:var(--ink-2);margin-top:4px;font-weight:500;}
.pcard .role{font-family:var(--mono);font-size:11.5px;color:var(--teal-deep);background:var(--wash);border-radius:8px;padding:8px 12px;margin:16px 0 14px;line-height:1.5;}
.pcard ul{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-direction:column;gap:9px;}
.pcard li{font-size:13.5px;color:var(--ink-2);line-height:1.62;padding-left:18px;position:relative;}
.pcard li::before{content:"";position:absolute;left:2px;top:8px;width:6px;height:6px;border-radius:2px;background:var(--teal);opacity:.7;}
.pcard li .code{font-family:var(--mono);font-size:12px;color:var(--teal-deep);}
.pcard .scene{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:7px;}
.pcard .scene span{font-family:var(--mono);font-size:11px;color:var(--ink-3);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:4px 9px;}

/* ============ 架构 ============ */
.arch{display:flex;flex-direction:column;gap:16px;max-width:960px;margin:0 auto;}
.layer{
  border:1px solid rgba(255,255,255,.14);border-radius:var(--r);padding:24px 26px;position:relative;
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));
}
.layer .lh{display:flex;align-items:baseline;gap:14px;margin-bottom:14px;flex-wrap:wrap;}
.layer .lh .idx{font-family:var(--mono);font-size:12px;color:var(--aqua);letter-spacing:.1em;}
.layer .lh h4{font-size:19px;color:#fff;}
.layer .lchips{display:flex;flex-wrap:wrap;gap:8px;}
.layer .lchips span{font-family:var(--mono);font-size:12px;color:#CDDDDE;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:8px;padding:6px 11px;}
.layer--top{border-color:rgba(15,160,172,.5);background:linear-gradient(180deg,rgba(15,160,172,.16),rgba(15,160,172,.05));}
.arch-arrow{display:flex;justify-content:center;color:var(--aqua);}
.arch-arrow svg{width:22px;height:22px;}
.arch-note{text-align:center;margin-top:22px;font-family:var(--mono);font-size:12px;color:#8FA6A8;letter-spacing:.04em;}

/* ============ 表格 ============ */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);}
table{width:100%;border-collapse:collapse;min-width:680px;}
thead th{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--teal-deep);
  text-align:left;padding:15px 20px;background:var(--wash);border-bottom:1px solid var(--line);white-space:nowrap;font-weight:600;
}
tbody td{padding:15px 20px;border-bottom:1px solid var(--line);font-size:13.5px;color:var(--ink-2);vertical-align:top;line-height:1.6;}
tbody tr:last-child td{border-bottom:none;}
tbody tr:hover{background:var(--paper);}
td .pt{font-family:var(--display);font-weight:600;color:var(--ink);font-size:14.5px;}
td .code,td .mono{font-family:var(--mono);font-size:12.5px;color:var(--teal-deep);}
td .num{font-family:var(--mono);color:var(--ink);}

/* ============ 优势 ============ */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.adv{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px;transition:border-color .2s,transform .2s;}
.adv:hover{transform:translateY(-3px);border-color:var(--line-2);}
.adv .ico{width:42px;height:42px;border-radius:11px;background:var(--wash);color:var(--teal-deep);display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.adv .ico svg{width:22px;height:22px;}
.adv.is-alert .ico{background:var(--alert-wash);color:var(--alert);}
.adv h4{font-size:17px;color:var(--ink);margin-bottom:9px;}
.adv p{font-size:13.5px;color:var(--ink-2);line-height:1.72;}

/* ============ 功能 ============ */
.fn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.fn{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px;}
.fn h4{display:flex;align-items:center;gap:10px;font-size:15.5px;color:var(--ink);margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line);}
.fn h4 .dot{width:9px;height:9px;border-radius:50%;background:var(--teal);flex:none;}
.fn.is-alert h4 .dot{background:var(--alert);}
.fn ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:11px;}
.fn li{font-size:13.5px;color:var(--ink-2);line-height:1.6;padding-left:20px;position:relative;}
.fn li::before{content:"▸";position:absolute;left:0;top:0;color:var(--teal);font-size:12px;}
.fn.is-alert li::before{color:var(--alert);}
.fn li b{color:var(--ink);font-weight:600;}

/* ============ 三级预警 legend ============ */
.warn-legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px;}
.wl{flex:1 1 200px;border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--surface);}
.wl .tag{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;display:inline-flex;align-items:center;gap:7px;font-weight:600;}
.wl .tag::before{content:"";width:9px;height:9px;border-radius:50%;}
.wl.l1 .tag{color:var(--teal-deep);}.wl.l1 .tag::before{background:var(--teal);}
.wl.l2 .tag{color:var(--amber);}.wl.l2 .tag::before{background:var(--amber);}
.wl.l3 .tag{color:var(--alert);}.wl.l3 .tag::before{background:var(--alert);}
.wl p{font-size:13px;color:var(--ink-2);margin-top:8px;line-height:1.6;}

/* ============ 应用场景 ============ */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.scard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px;position:relative;transition:transform .2s,box-shadow .2s;}
.scard:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.scard .no{font-family:var(--display);font-weight:700;font-size:14px;color:var(--teal);letter-spacing:.05em;}
.scard h4{font-size:16px;color:var(--ink);margin:8px 0 10px;}
.scard p{font-size:13.5px;color:var(--ink-2);line-height:1.68;}

/* ============ CTA / footer ============ */
.cta{background:var(--ink);color:#fff;border-radius:0;}
.cta-inner{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:center;}
.cta h2{font-size:clamp(24px,3.6vw,38px);color:#fff;letter-spacing:-.02em;}
.cta p{margin-top:16px;color:#AFC2C4;font-size:16px;line-height:1.8;max-width:520px;}
.cta-obj{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px;}
.cta-obj span{font-family:var(--mono);font-size:12px;color:#CDDDDE;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:100px;padding:7px 13px;}
.cta-panel{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:var(--r);padding:28px;}
.cta-panel .row{display:flex;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px dashed rgba(255,255,255,.16);font-size:14px;}
.cta-panel .row:last-of-type{border-bottom:none;}
.cta-panel .row .lbl{font-family:var(--mono);font-size:12px;color:#8FA6A8;letter-spacing:.06em;}
.cta-panel .row .val{color:#fff;text-align:right;}
.cta-panel .btn{width:100%;justify-content:center;margin-top:20px;}

.foot{background:var(--ink);color:#7E9698;border-top:1px solid rgba(255,255,255,.1);padding-block:34px;font-size:13px;}
.foot .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center;}
.foot .std{font-family:var(--mono);font-size:11.5px;color:#6C8385;letter-spacing:.03em;line-height:1.8;}
.foot a{color:#AFC2C4;}

/* ============ reveal 动画 ============ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1);}
.reveal.in{opacity:1;transform:none;}

/* ============ 响应式 ============ */
@media(max-width:1000px){
  .prod-grid,.adv-grid,.fn-grid,.scene-grid{grid-template-columns:repeat(2,1fr);}
  .hero-grid{grid-template-columns:1fr;}
  .flowcard{order:-1;}
  .cta-inner{grid-template-columns:1fr;}
}
@media(max-width:760px){
  .nav-inner{flex-wrap:wrap;height:auto;padding-block:9px;gap:8px 14px;}
  .brand{order:1;}
  .nav-cta{order:2;margin-left:auto;}
  .nav-cta .btn{padding:9px 16px;font-size:13.5px;}
  .nav-links{order:3;width:100%;flex-wrap:wrap;gap:10px 16px;font-size:13.5px;padding-top:8px;border-top:1px solid var(--line);}
  .prod-grid,.adv-grid,.fn-grid,.scene-grid,.def-grid{grid-template-columns:1fr;}
}
@media(max-width:480px){
  .fl{flex-basis:100%;}
  .flow-legend{flex-direction:column;}
}

/* reduced motion */
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
  .reveal{opacity:1;transform:none;}
}

/* print */
@media print{
  .nav,.hero-cta,.nav-toggle{display:none;}
  body{background:#fff;color:#000;font-size:12px;}
  .section{padding-block:20px;break-inside:avoid;}
  .section--ink,.cta,.foot{background:#fff!important;color:#000!important;}
  .pcard,.adv,.fn,.def,.scard,.table-wrap,.flowcard{box-shadow:none;border-color:#ccc;break-inside:avoid;}
  .flow-line,.ring{animation:none!important;}
}

/* 无 JS：内容默认可见（滚动进入动画已移除依赖） */
.reveal{opacity:1;transform:none;}