:root{
  --bg:#f6f8fb;--ink:#14213d;--muted:#64748b;--line:#e3e8f0;
  --teal:#14b8a6;--indigo:#6366f1;--rose:#f43f5e;--amber:#f59e0b;--sky:#0ea5e9;
  --card:#ffffffcc;--radius:18px;--shadow:0 10px 30px -12px rgba(20,33,61,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* nav */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;justify-content:space-between;align-items:center;
  padding:14px 32px;transition:.3s}
.nav.solid{background:#ffffffd9;backdrop-filter:blur(14px);box-shadow:0 1px 0 var(--line)}
.brand{font-weight:800;letter-spacing:.5px;display:flex;align-items:center;gap:8px;font-size:18px}
.brand em{font-style:normal;color:var(--muted);font-weight:500}
.dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--teal),var(--indigo));display:inline-block}
.nav nav{display:flex;gap:6px;align-items:center}
.nav nav a{padding:8px 14px;border-radius:999px;font-size:14px;color:#334155;transition:.2s}
.nav nav a:hover{background:#0000000a}
.nav nav a.pill{background:var(--ink);color:#fff}
.nav nav a.pill:hover{background:#000}

/* hero */
.hero{position:relative;overflow:hidden;min-height:100vh;display:flex;align-items:center;
  background:linear-gradient(160deg,#eef7ff 0%,#f1f0ff 50%,#eafaf6 100%)}
.orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;animation:float 14s ease-in-out infinite}
.o1{width:420px;height:420px;background:#7dd3fc;top:-80px;left:-80px}
.o2{width:380px;height:380px;background:#c4b5fd;right:-60px;top:20%;animation-delay:-5s}
.o3{width:340px;height:340px;background:#99f6e4;bottom:-100px;left:35%;animation-delay:-9s}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(30px,-30px)}}
.hero-inner{position:relative;max-width:900px;margin:0 auto;padding:120px 24px 60px;text-align:center}
.tag{display:inline-block;padding:6px 16px;border-radius:999px;background:#ffffffb0;border:1px solid var(--line);
  font-size:13px;color:#475569;margin-bottom:26px}
.hero h1{font-size:clamp(34px,6vw,64px);line-height:1.2;font-weight:800;letter-spacing:-1px}
.grad{background:linear-gradient(90deg,var(--teal),var(--indigo));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin:22px auto 34px;font-size:clamp(16px,2vw,20px);color:#475569;max-width:640px}
.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{padding:14px 30px;border-radius:999px;font-weight:600;transition:.25s;font-size:15px}
.btn.primary{background:linear-gradient(90deg,var(--teal),var(--indigo));color:#fff;box-shadow:0 12px 24px -8px #6366f180}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px -8px #6366f1a0}
.btn.ghost{background:#fff;border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--indigo);color:var(--indigo)}
.stats{margin-top:64px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stats div{background:#ffffffaa;border:1px solid #fff;border-radius:var(--radius);padding:18px 8px;backdrop-filter:blur(8px)}
.stats b{display:block;font-size:34px;font-weight:800;background:linear-gradient(90deg,var(--teal),var(--indigo));-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{font-size:13px;color:var(--muted)}

/* sections */
.sec{padding:104px 0}
.sec.alt{background:#fff}
.title{font-size:32px;font-weight:800;margin-bottom:12px;display:flex;align-items:center;gap:14px}
.title i{font-style:normal;font-size:14px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--teal),var(--indigo));
  padding:4px 10px;border-radius:8px}
.sub{color:var(--muted);margin-bottom:40px;max-width:760px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid3.mini{margin-top:34px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.3s}
.card:hover{transform:translateY(-4px)}
.card .ico{font-size:32px;margin-bottom:10px}
.card h3{font-size:19px;margin-bottom:8px}
.card h4{font-size:16px;margin-bottom:6px}
.card p{color:#475569;font-size:15px}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s,transform .7s}
.reveal.in{opacity:1;transform:none}

/* categories */
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cat{border-radius:var(--radius);padding:26px;color:#fff;box-shadow:var(--shadow);position:relative;overflow:hidden}
.cat .n{font-size:12px;font-weight:700;letter-spacing:1px;opacity:.85}
.cat h3{font-size:21px;margin:6px 0 10px}
.cat p{font-size:14px;opacity:.95}
.cat small{display:block;margin-top:14px;padding-top:12px;border-top:1px solid #ffffff55;opacity:.9;font-size:13px}
.c1{background:linear-gradient(150deg,#fb7185,#e11d48)}
.c2{background:linear-gradient(150deg,#fbbf24,#f59e0b)}
.c3{background:linear-gradient(150deg,#818cf8,#4f46e5)}
.c4{background:linear-gradient(150deg,#5eead4,#0d9488)}

/* stepper */
.stepper{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
.step{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px;text-align:left;cursor:pointer;
  display:flex;flex-direction:column;gap:2px;font:inherit;font-weight:700;color:var(--ink);transition:.25s;position:relative}
.step span{width:28px;height:28px;border-radius:50%;background:#eef2ff;color:var(--indigo);display:grid;place-items:center;font-size:14px;margin-bottom:6px}
.step em{font-style:normal;font-weight:500;font-size:12px;color:var(--muted)}
.step:hover{border-color:var(--indigo)}
.step.active{background:linear-gradient(135deg,var(--teal),var(--indigo));color:#fff;border-color:transparent;box-shadow:0 14px 26px -12px #6366f1aa}
.step.active span{background:#ffffff33;color:#fff}
.step.active em{color:#ffffffcc}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);min-height:250px;animation:fade .4s}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.panel h3{font-size:22px;margin-bottom:8px}
.panel .why{margin-top:16px;padding:14px 18px;background:#f5f3ff;border-left:4px solid var(--indigo);border-radius:8px;font-size:14px;color:#3730a3}
.branches{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}
.branches div{border:1px dashed #cbd5e1;border-radius:12px;padding:14px;font-size:14px}
.branches b{display:block;margin-bottom:4px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip{padding:4px 12px;border-radius:999px;font-size:12px;background:#ecfeff;color:#0e7490;border:1px solid #a5f3fc}

/* results */
.toggle{display:inline-flex;background:#eef2f7;border-radius:999px;padding:4px;margin-bottom:28px}
.toggle button{border:0;background:transparent;padding:10px 22px;border-radius:999px;cursor:pointer;font:inherit;font-size:14px;font-weight:600;color:#475569;transition:.25s}
.toggle button.on{background:#fff;color:var(--indigo);box-shadow:0 4px 12px -4px #0002}
.bars{display:flex;flex-direction:column;gap:16px;background:var(--bg);padding:28px;border-radius:var(--radius);border:1px solid var(--line)}
.bar{display:grid;grid-template-columns:200px 1fr 70px;gap:16px;align-items:center}
.bar .lab{font-weight:600;font-size:15px}
.bar .lab small{display:block;font-weight:400;color:var(--muted);font-size:12px}
.track{height:22px;background:#e8edf5;border-radius:999px;overflow:hidden}
.fill{height:100%;border-radius:999px;width:0;background:linear-gradient(90deg,var(--teal),var(--sky));transition:width 1s cubic-bezier(.2,.8,.2,1)}
.bar.hl .fill{background:linear-gradient(90deg,var(--indigo),#a855f7)}
.bar .val{font-weight:800;text-align:right;font-variant-numeric:tabular-nums}
.note{margin-top:24px;background:#fffbeb;border:1px solid #fde68a;border-radius:var(--radius);padding:22px 26px;font-size:15px;color:#78350f}
.note ul{margin:8px 0 0 20px}
.note li{margin:4px 0}

/* demo */
.demo{display:grid;grid-template-columns:320px 1fr;gap:24px}
.cases{display:flex;flex-direction:column;gap:10px}
.case{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;text-align:left;cursor:pointer;font:inherit;transition:.2s}
.case:hover{border-color:var(--indigo)}
.case.active{border-color:var(--indigo);background:#eef2ff;box-shadow:0 8px 18px -10px #6366f1}
.case b{display:block;font-size:14px}
.case span{font-size:12px;color:var(--muted)}
.result{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);min-height:420px}
.quote{background:#f8fafc;border-left:4px solid var(--teal);border-radius:8px;padding:14px 18px;font-size:15px;margin-bottom:20px;color:#334155}
.quote mark{background:#fef08a;padding:0 2px;border-radius:3px}
.evrow{display:grid;grid-template-columns:110px 1fr;gap:6px 14px;font-size:14px;padding:12px 0;border-top:1px dashed var(--line)}
.evrow .k{color:var(--muted)}
.final{margin-top:18px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.badge{padding:8px 18px;border-radius:999px;color:#fff;font-weight:700}
.vote{display:flex;gap:8px;flex-wrap:wrap}
.vote span{font-size:12px;background:#f1f5f9;border-radius:8px;padding:4px 10px}
.abst{margin-top:14px;padding:12px 16px;background:#fef2f2;border:1px solid #fecaca;border-radius:12px;color:#991b1b;font-size:14px}

/* data flow */
.flow{display:flex;align-items:stretch;gap:10px;flex-wrap:wrap;justify-content:center}
.node{flex:1 1 150px;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:18px;text-align:center}
.node b{display:block;margin-bottom:4px}
.node span{font-size:13px;color:var(--muted)}
.arrow{align-self:center;color:var(--indigo);font-size:22px;font-weight:700}

/* help */
.help{background:linear-gradient(160deg,#fff1f2,#fff7ed)}
.card.hot h3{font-size:28px;background:linear-gradient(90deg,var(--rose),var(--amber));-webkit-background-clip:text;background-clip:text;color:transparent}
.disc{margin-top:28px;color:#7c2d12;font-size:14px}

footer{background:var(--ink);color:#cbd5e1;padding:36px 0;font-size:14px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
footer .muted{color:#94a3b8}

@media(max-width:900px){
  .grid3,.cats{grid-template-columns:1fr 1fr}
  .demo{grid-template-columns:1fr}
  .cases{flex-direction:row;overflow-x:auto}
  .case{min-width:220px}
  .stepper{grid-template-columns:1fr 1fr}
  .nav nav a:not(.pill){display:none}
}
@media(max-width:600px){
  .grid3,.cats,.branches{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .bar{grid-template-columns:1fr 60px}
  .bar .lab{grid-column:1/-1}
  .sec{padding:72px 0}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}