*{margin:0;padding:0;box-sizing:border-box}
:root{--c1:#0d9488;--c2:#14b8a6;--c3:#0f766e;--dark:#0c1222;--card:#111827;--text:#e2e8f0;--muted:#94a3b8;--white:#fff;--line:rgba(255,255,255,.08);--r:16px}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,sans-serif;background:var(--dark);color:var(--text);line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1120px,92%);margin:0 auto}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:999px;font-weight:600;font-size:15px;border:none;cursor:pointer;transition:.25s}
.btn-main{background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;box-shadow:0 8px 24px rgba(13,148,136,.35)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(13,148,136,.45)}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.25);color:#fff}
.btn-ghost:hover{border-color:var(--c2);color:var(--c2)}
.btn-sm{padding:9px 18px;font-size:13px}

/* header */
.top{position:fixed;inset:0 0 auto;z-index:50;transition:.3s;border-bottom:1px solid transparent}
.top.on{background:rgba(12,18,34,.92);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.brand img{width:36px;height:36px;border-radius:10px}
.menu{display:flex;align-items:center;gap:6px;list-style:none}
.menu a{padding:8px 14px;font-size:14px;color:var(--muted);border-radius:8px;transition:.2s}
.menu a:hover,.menu a.on{color:#fff}
.ham{display:none;flex-direction:column;gap:5px;background:0;border:0;cursor:pointer;padding:6px}
.ham i{width:22px;height:2px;background:#fff;border-radius:2px}

/* hero - split reverse: demo left, text right on large */
.hero{padding:110px 0 70px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(20,184,166,.18),transparent 70%);top:-80px;left:-100px;pointer-events:none}
.hero-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:center}
.panel{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 20px 50px rgba(0,0,0,.35)}
.panel-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;font-size:13px;color:var(--muted)}
.dot{width:8px;height:8px;border-radius:50%;background:#22c55e;display:inline-block;margin-right:6px}
.speed-ring{width:150px;height:150px;margin:10px auto 8px;border-radius:50%;border:7px solid rgba(20,184,166,.2);border-top-color:var(--c2);display:flex;flex-direction:column;align-items:center;justify-content:center;transition:.4s}
.speed-ring.run{animation:spin 1s linear infinite;border-top-color:#34d399}
@keyframes spin{to{transform:rotate(360deg)}}
.speed-n{font-size:1.7rem;font-weight:800;color:#fff}
.speed-u{font-size:11px;color:var(--muted)}
.nodes{display:grid;gap:8px;margin-top:14px}
.node{display:flex;justify-content:space-between;align-items:center;padding:11px 14px;background:rgba(255,255,255,.04);border-radius:10px;cursor:pointer;font-size:13px;border:1px solid transparent;transition:.2s}
.node:hover,.node.sel{border-color:rgba(20,184,166,.4);background:rgba(20,184,166,.1)}
.hero h1{font-size:clamp(2rem,4.5vw,2.85rem);font-weight:800;line-height:1.2;margin-bottom:16px}
.hero h1 em{font-style:normal;color:var(--c2)}
.hero .lead{color:var(--muted);font-size:1.05rem;margin-bottom:24px;max-width:480px}
.pills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.pill{padding:6px 14px;border-radius:999px;background:rgba(20,184,166,.12);color:var(--c2);font-size:12px;font-weight:600}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}

/* sections */
.sec{padding:72px 0}
.sec-h{text-align:center;margin-bottom:40px}
.sec-h h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;margin-bottom:10px}
.sec-h p{color:var(--muted);max-width:520px;margin:0 auto}
.alt{background:rgba(255,255,255,.02)}

/* why - horizontal timeline style */
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.why-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 18px;text-align:center;position:relative}
.why-item .n{font-size:2rem;font-weight:800;color:var(--c1);opacity:.5;margin-bottom:8px}
.why-item h3{font-size:1rem;margin-bottom:8px}
.why-item p{font-size:13px;color:var(--muted)}

/* features - 2 col big cards */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.feat-card{display:flex;gap:18px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px;transition:.25s}
.feat-card:hover{border-color:rgba(20,184,166,.35);transform:translateY(-3px)}
.feat-ico{width:48px;height:48px;border-radius:12px;background:rgba(20,184,166,.15);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.feat-card h3{font-size:1.05rem;margin-bottom:6px}
.feat-card p{font-size:13px;color:var(--muted)}

/* scenarios - bento */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.bento-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;min-height:120px}
.bento-item.wide{grid-column:span 2}
.bento-item h3{font-size:1rem;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.bento-item p{font-size:13px;color:var(--muted)}

/* pricing - horizontal cards */
.price-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.price{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px 22px;text-align:center;position:relative}
.price.hot{border-color:var(--c1);box-shadow:0 0 0 1px var(--c1),0 16px 40px rgba(13,148,136,.2)}
.price .tag{position:absolute;top:-11px;left:50%;transform:translateX(-50%);background:var(--c1);color:#fff;font-size:11px;font-weight:700;padding:3px 12px;border-radius:999px}
.price .name{font-size:1.1rem;font-weight:700;margin-bottom:6px}
.price .amt{font-size:2.2rem;font-weight:800;color:var(--c2);margin:10px 0}
.price .amt small{font-size:.9rem;font-weight:500;color:var(--muted)}
.price ul{list-style:none;text-align:left;margin:18px 0;font-size:13px}
.price li{padding:7px 0;border-bottom:1px solid var(--line);color:var(--muted)}
.price li::before{content:"✓ ";color:var(--c2)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{text-align:center;padding:20px}
.step .num{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.step h3{margin-bottom:8px}
.step p{font-size:13px;color:var(--muted)}

/* faq */
.faq{max-width:720px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden;background:var(--card)}
.faq-q{width:100%;text-align:left;padding:16px 18px;background:0;border:0;color:#fff;font-size:14px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between}
.faq-q::after{content:"+";color:var(--c2);font-size:18px}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s}
.faq-item.open .faq-a{max-height:280px}
.faq-a div{padding:0 18px 16px;font-size:13px;color:var(--muted)}

/* reviews */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rev{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.rev .stars{color:#fbbf24;font-size:13px;margin-bottom:10px}
.rev p{font-size:13px;color:var(--muted);margin-bottom:14px}
.rev .who{font-size:13px;font-weight:600}

/* cta band */
.band{padding:60px 0;text-align:center;background:linear-gradient(135deg,rgba(13,148,136,.2),rgba(15,23,42,.5));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.band h2{font-size:1.7rem;margin-bottom:10px}
.band p{color:var(--muted);margin-bottom:22px}

/* footer */
.foot{padding:48px 0 28px;border-top:1px solid var(--line)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;margin-bottom:28px}
.foot h4{font-size:14px;margin-bottom:12px;color:#fff}
.foot p,.foot a{font-size:13px;color:var(--muted)}
.foot a:hover{color:var(--c2)}
.foot ul{list-style:none}
.foot li{margin-bottom:8px}
.foot-bot{padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

@media(max-width:992px){
.ham{display:flex}
.menu{position:fixed;top:68px;left:0;right:0;background:var(--dark);flex-direction:column;padding:16px;border-bottom:1px solid var(--line);transform:translateY(-120%);opacity:0;visibility:hidden;transition:.3s}
.menu.open{transform:none;opacity:1;visibility:visible}
.hero-grid,.feat,.price-row,.steps,.reviews,.why{grid-template-columns:1fr}
.bento{grid-template-columns:1fr}
.bento-item.wide{grid-column:span 1}
.foot-grid{grid-template-columns:1fr 1fr}
.hero-grid{gap:32px}
}
@media(max-width:600px){
.foot-grid{grid-template-columns:1fr}
.hero{padding:90px 0 50px}
.hero-cta{flex-direction:column}
.hero-cta .btn{width:100%}
}