/* 产品介绍 v3 — 对齐 2026 官网视觉 */
:root{
  --ink:#0b1220;
  --muted:#5b6b7c;
  --line:rgba(11,18,32,.08);
  --accent:#0f766e;
  --accent-2:#0d9488;
  --bg:#f3f6f8;
  --paper:#ffffff;
  --font:"IBM Plex Sans","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.pi{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
.wrap{width:min(1100px,calc(100% - 40px));margin:0 auto}

.pi-nav{
  position:fixed;inset:0 0 auto;z-index:40;
  display:flex;align-items:center;gap:18px;
  padding:14px 28px;
  transition:background .25s,box-shadow .25s;
}
.pi-nav.is-solid{
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  box-shadow:0 1px 0 var(--line);
}
.pi-nav .brand{
  display:inline-flex;align-items:center;gap:10px;
  color:var(--ink);font-weight:700;font-size:15px;
}
.pi-nav .mark{
  width:30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(145deg,#0f766e,#0e7490);
  color:#fff;font-size:14px;font-weight:800;
}
.pi-nav .links{
  margin-left:auto;display:flex;flex-wrap:wrap;gap:4px 18px;align-items:center;font-size:13.5px;
}
.pi-nav .links a{color:rgba(11,18,32,.62);padding:6px 0;font-weight:500}
.pi-nav .links a:hover{color:var(--accent)}
.pi-nav .cta{
  margin-left:6px;padding:8px 14px!important;border-radius:10px;
  background:var(--accent);color:#fff!important;font-weight:650;
}
.nav-toggle{
  display:none;margin-left:auto;width:40px;height:40px;border:0;background:transparent;cursor:pointer;position:relative;
}
.nav-toggle span,.nav-toggle span:before,.nav-toggle span:after{
  display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;margin:0 auto;
  content:"";position:relative;
}
.nav-toggle span:before{position:absolute;top:-6px;left:0}
.nav-toggle span:after{position:absolute;top:6px;left:0}

.pi-hero{
  position:relative;min-height:100vh;min-height:100dvh;
  display:flex;align-items:center;
  padding:108px 0 64px;overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(15,118,110,.16), transparent 55%),
    radial-gradient(700px 380px at 100% 0%, rgba(14,116,144,.1), transparent 50%),
    linear-gradient(165deg,#f7fafb 0%,#eef3f5 55%,#e8eef2 100%);
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;
}
.brand-line{
  margin:0 0 12px;
  font-size:clamp(26px,4vw,40px);
  font-weight:750;letter-spacing:-.03em;line-height:1.1;
}
.hero-copy h1{
  margin:0 0 16px;
  font-size:clamp(28px,4.2vw,46px);
  font-weight:700;letter-spacing:-.03em;line-height:1.15;
}
.lead{margin:0 0 28px;color:var(--muted);font-size:16px;line-height:1.7;max-width:32em}
.actions{display:flex;flex-wrap:wrap;gap:12px}
.actions.center{justify-content:center;margin-top:28px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:46px;padding:0 20px;border-radius:12px;font-weight:650;font-size:14px;
  transition:transform .2s,background .2s,border-color .2s;
}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,#0f766e,#0e7490);color:#fff}
.btn.ghost{background:#fff;border:1px solid var(--line);color:var(--ink)}
.btn.ghost.dark{background:var(--ink);color:#fff;border-color:var(--ink)}

.hero-visual{
  border-radius:22px;overflow:hidden;
  border:1px solid var(--line);
  box-shadow:0 24px 60px rgba(11,18,32,.12);
  background:#0b1220;
}
.hero-visual img{
  display:block;width:100%;height:auto;
  animation:floaty 8s ease-in-out infinite alternate;
}
@keyframes floaty{
  from{transform:scale(1.01)}
  to{transform:scale(1.04) translateY(-1%)}
}

.pi-band{padding:84px 0}
.pi-band.tone{background:#fff;border-block:1px solid var(--line)}
.kicker{
  margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;color:var(--accent);
}
.sec-head{margin-bottom:28px}
.sec-head.center{text-align:center}
.sec-head h2{margin:0;font-size:clamp(22px,3vw,32px);letter-spacing:-.02em}

.channel-rail{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
}
.ch{
  padding:22px 18px;border-radius:16px;background:#fff;border:1px solid var(--line);
}
.ch .idx{display:block;margin-bottom:12px;font-size:12px;font-weight:750;color:var(--accent);letter-spacing:.08em}
.ch h3{margin:0 0 8px;font-size:16px}
.ch p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.65}

.split-list,.pillar-row{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;
}
.split-list article,.pillar-row article{
  padding:24px 20px;border-radius:16px;background:var(--bg);border:1px solid var(--line);
}
.pi-band.tone .split-list article{background:var(--bg)}
.split-list h3,.pillar-row h3{margin:0 0 8px;font-size:16px}
.split-list p,.pillar-row p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}

.open{background:
  radial-gradient(700px 280px at 50% 0%, rgba(15,118,110,.1), transparent 60%),
  #fff}
.open-steps{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;
}
.open-steps li{
  padding:24px 20px;border-radius:16px;background:var(--bg);border:1px solid var(--line);
}
.open-steps span{display:block;margin-bottom:10px;font-weight:750;color:var(--accent)}
.open-steps p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}

.pi-foot{
  padding:28px 0;background:var(--ink);color:rgba(255,255,255,.55);font-size:13px;
}
.pi-foot .foot{display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between}
.pi-foot .brand{display:inline-flex;align-items:center;gap:8px;color:#fff;font-weight:650}
.pi-foot .mark{
  width:24px;height:24px;border-radius:7px;display:grid;place-items:center;
  background:var(--accent);font-size:12px;font-weight:800;color:#fff;
}
.pi-foot a{color:rgba(255,255,255,.7)}
.pi-foot p{margin:0}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:960px){
  .hero-grid,.channel-rail,.split-list,.pillar-row,.open-steps{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .pi-nav .links{
    display:none;position:absolute;left:12px;right:12px;top:58px;
    flex-direction:column;align-items:stretch;gap:0;padding:10px;border-radius:14px;
    background:#fff;box-shadow:0 16px 40px rgba(11,18,32,.12);
  }
  .pi-nav .links.open{display:flex}
  .pi-nav .links a{padding:12px 14px;border-radius:10px}
  .pi-nav .cta{margin:8px 0 0!important;text-align:center}
}