:root{
  --primary:#2674F1;
  --primary-dark:#1E54C8;
  --primary-soft:#4FB6E5;
  --accent:#00C2A8;
  --text:#0F1B36;
  --text-2:#4B5876;
  --text-3:#7C8AAB;
  --line:#E8EDF6;
  --bg:#FFFFFF;
  --bg-soft:#F5F8FF;
  --bg-blue:#EAF2FF;
  --shadow-sm:0 6px 16px rgba(15,27,54,.06);
  --shadow-md:0 14px 40px rgba(15,27,54,.08);
  --shadow-lg:0 24px 60px rgba(15,27,54,.10);
  --radius:16px;
  --radius-lg:22px;
  --maxw:480px;
  --nav-h:60px;
  --fab-h:52px;
  --pb:calc(var(--nav-h) + var(--fab-h) + 34px + env(safe-area-inset-bottom));
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans CJK SC",-apple-system,BlinkMacSystemFont,Helvetica,Arial,sans-serif;
  font-size:15px;line-height:1.78;color:var(--text);
  background:#EEF2F8;
  -webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;
  padding-bottom:var(--pb);
}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{color:inherit;text-decoration:none}

/* phone column */
.app{position:relative;max-width:var(--maxw);margin:0 auto;min-height:100vh;background:var(--bg);overflow:hidden;
  box-shadow:0 0 60px rgba(15,27,54,.08)}
.orbs{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;animation:drift 20s ease-in-out infinite}
.orb.a{width:300px;height:300px;background:radial-gradient(circle,rgba(38,116,241,.16),transparent 70%);top:-8%;left:-18%}
.orb.b{width:260px;height:260px;background:radial-gradient(circle,rgba(0,194,168,.13),transparent 70%);bottom:14%;right:-20%;animation-delay:-7s}
.orb.c{width:220px;height:220px;background:radial-gradient(circle,rgba(79,182,229,.14),transparent 70%);top:46%;right:18%;animation-delay:-13s}
@keyframes drift{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(26px,-20px) scale(1.08)}}

/* fixed top bar */
.topbar{position:fixed;left:50%;transform:translateX(-50%);width:100%;max-width:var(--maxw);z-index:70;top:0;
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 18px;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:30px;width:30px;border-radius:9px 9px 0 0;object-fit:contain}
.brand b{font-size:15px;letter-spacing:1px;font-weight:800;color:var(--text);line-height:1}
.brand small{display:block;font-size:7.5px;color:var(--text-3);letter-spacing:2px;margin-top:3px}
.sec-label{font-size:12px;color:var(--primary);letter-spacing:2px;font-weight:700}
.progress{position:fixed;left:50%;transform:translateX(-50%);top:0;height:3px;width:0;z-index:73;
  background:linear-gradient(90deg,var(--primary),var(--primary-soft),var(--accent));transition:width .15s linear}

/* sections */
.section{position:relative;z-index:2;padding:clamp(56px,10vh,78px) 22px clamp(32px,5.5vh,42px)}
.section.alt{background:var(--bg-soft)}
.section.hero{
  min-height:86vh;display:flex;flex-direction:column;justify-content:center;
  padding-top:clamp(82px,14vh,104px);
  background:
    radial-gradient(ellipse 90% 60% at 95% 0%,rgba(38,116,241,.10),transparent 60%),
    radial-gradient(ellipse 80% 50% at 5% 100%,rgba(0,194,168,.08),transparent 60%),
    linear-gradient(180deg,#F5F8FF 0%,#EAF2FF 50%,#FFFFFF 100%);
}
.hero-visual{margin-top:28px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:4/3.2}
.hero-visual img{width:100%;height:100%;object-fit:cover;transform:scale(1.04);animation:kb 12s ease-out both}
@keyframes kb{from{transform:scale(1.02)}to{transform:scale(1.12)}}

.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:11.5px;letter-spacing:2.5px;color:var(--primary);font-weight:700;text-transform:uppercase}
.eyebrow::before{content:"";width:22px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--primary),var(--accent))}
h1.title{font-size:clamp(27px,8.4vw,39px);line-height:1.2;font-weight:800;letter-spacing:-.5px;margin:14px 0 16px;color:var(--text)}
h2.title{font-size:clamp(21px,6.2vw,28px);line-height:1.28;font-weight:800;margin:12px 0 12px;color:var(--text)}
.lead{font-size:14.5px;color:var(--text-2);line-height:1.85}
.grad{background:linear-gradient(120deg,var(--primary),var(--primary-soft) 60%,var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.kicker{color:var(--text-3);font-size:12.5px;letter-spacing:1px;line-height:1.7}
.hint{margin-top:22px;font-size:12px;color:var(--text-3);display:flex;align-items:center;gap:8px}
.hint svg{width:16px;height:16px;color:var(--primary)}

/* stats */
.stats{display:flex;flex-direction:column;gap:12px;margin-top:10px}
.stat{position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow-sm)}
.stat::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--primary),var(--accent))}
.stat .num{font-size:clamp(30px,9vw,40px);font-weight:800;line-height:1;color:var(--text);font-variant-numeric:tabular-nums}
.stat .num .unit{font-size:.4em;color:var(--text-3);font-weight:600;margin-left:4px}
.stat .lbl{margin-top:8px;color:var(--text-2);font-size:13.5px;line-height:1.5}
.stat .sub{color:var(--text-3);font-size:11.5px;margin-top:3px}
.note{margin-top:16px;font-size:12.5px;color:var(--primary);background:rgba(38,116,241,.07);border:1px solid rgba(38,116,241,.16);
  border-radius:12px;padding:12px 14px;line-height:1.7}

/* image grid + hero pair */
.img-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.img-grid figure{border-radius:14px;overflow:hidden;box-shadow:var(--shadow-sm);aspect-ratio:4/3;border:1px solid var(--line)}
.img-grid img{width:100%;height:100%;object-fit:cover}

/* product cards (负离子系列) */
.prod-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.prod{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .28s cubic-bezier(.22,.61,.36,1),box-shadow .28s cubic-bezier(.22,.61,.36,1)}
.prod:active{transform:scale(.985);box-shadow:var(--shadow-md)}
.prod img{width:100%;aspect-ratio:1/1;object-fit:cover}
.prod .pbody{padding:11px 12px 13px}
.prod b{display:block;font-size:14px;font-weight:700;color:var(--text);line-height:1.35}
.prod .spec{display:block;font-size:11px;color:var(--text-2);margin-top:4px;line-height:1.45}
.prod .price{display:flex;align-items:baseline;gap:4px;margin-top:6px;font-size:11.5px;color:var(--text-3)}
.prod .price b{display:inline;font-size:14px;font-weight:800;color:var(--primary)}
.prod .desc{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;font-size:10.5px;color:var(--text-3);margin-top:6px;line-height:1.5}
.prod .badge{position:absolute;top:9px;left:9px;display:inline-flex;align-items:center;gap:2px;padding:4px 8px;border-radius:18px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:10.5px;font-weight:700;box-shadow:0 4px 10px rgba(38,116,241,.35)}
.prod{position:relative}

/* case strip horizontal scroll */
.case-row{margin-top:18px}
.case-row .ttl{font-size:13px;color:var(--text-3);letter-spacing:1px;margin-bottom:10px}
.case-strip{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:6px;scrollbar-width:none;
  -webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 22px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 22px),transparent)}
.case-strip::-webkit-scrollbar{display:none}
.case-strip figure{flex:0 0 132px;scroll-snap-align:start;position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line);aspect-ratio:4/5;box-shadow:var(--shadow-sm)}
.case-strip img{width:100%;height:100%;object-fit:cover}
.case-strip figcaption{position:absolute;left:0;right:0;bottom:0;padding:8px 10px;font-size:11.5px;font-weight:600;color:#fff;background:linear-gradient(0deg,rgba(15,27,54,.82),transparent)}

/* accordion products */
.acc{margin-top:8px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow-sm)}
.acc + .acc{margin-top:10px}
.acc-h{width:100%;display:flex;align-items:center;gap:12px;padding:16px 18px;text-align:left}
.acc-h .idx{font-size:17px;font-weight:800;color:var(--primary);font-variant-numeric:tabular-nums;flex:0 0 auto;width:26px}
.acc-h .ht{flex:1}
.acc-h .ht b{display:block;font-size:16px;font-weight:700;color:var(--text)}
.acc-h .ht small{display:block;font-size:10px;color:var(--text-3);letter-spacing:1.5px;text-transform:uppercase;margin-top:2px}
.acc-ic{flex:0 0 auto;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:var(--bg-blue);color:var(--primary);font-size:18px;line-height:1;transition:transform .3s,color .3s}
.acc.open .acc-ic{transform:rotate(45deg);color:var(--accent)}
.acc-b{max-height:0;overflow:hidden;transition:max-height .4s ease}
.acc-b .inner{padding:0 18px 16px 56px;font-size:13px;color:var(--text-2);line-height:1.85}
.acc-b .inner img{margin-top:12px;border-radius:12px;width:100%;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--line)}

/* feature cards */
.feat{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-top:12px;box-shadow:var(--shadow-sm);transition:transform .15s ease,box-shadow .15s ease}
.feat:active{transform:scale(.985);box-shadow:var(--shadow-md)}
.feat .ic{flex:0 0 auto;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(38,116,241,.12),rgba(0,194,168,.12));color:var(--primary);border:1px solid var(--line)}
.feat .ic svg{width:22px;height:22px}
.feat h4{font-size:16px;font-weight:700;color:var(--text);margin-bottom:5px}
.feat p{font-size:13px;color:var(--text-2);line-height:1.75}

/* steps timeline */
.steps{margin-top:10px;position:relative;padding-left:6px}
.step{position:relative;padding:0 0 18px 34px}
.step:last-child{padding-bottom:0}
.step::before{content:"";position:absolute;left:11px;top:26px;bottom:-2px;width:2px;background:linear-gradient(180deg,var(--primary),rgba(38,116,241,.12))}
.step:last-child::before{display:none}
.step .snum{position:absolute;left:0;top:0;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-weight:800;font-size:12px;box-shadow:0 6px 14px rgba(38,116,241,.3)}
.step h5{font-size:15px;font-weight:700;color:var(--text);margin-bottom:3px}
.step p{font-size:12.5px;color:var(--text-2);line-height:1.65}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 4px}
.chip{background:#fff;border:1px solid var(--line);border-radius:30px;padding:9px 16px;font-size:13px;font-weight:600;color:var(--text-2);display:flex;align-items:center;gap:7px;box-shadow:var(--shadow-sm)}
.chip svg{width:15px;height:15px;color:var(--accent)}

/* glob list */
.glob{display:flex;gap:13px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px 16px;margin-top:11px;box-shadow:var(--shadow-sm)}
.glob svg{width:22px;height:22px;color:var(--primary);flex:0 0 auto;margin-top:2px}
.glob b{display:block;font-size:14.5px;color:var(--text);margin-bottom:3px}
.glob span{font-size:12.5px;color:var(--text-2);line-height:1.65}

/* contact */
.contact .row{display:flex;align-items:center;gap:13px;margin-bottom:14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;box-shadow:var(--shadow-sm)}
.contact .row .ic{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;background:var(--bg-blue);border:1px solid var(--line);color:var(--primary);flex:0 0 auto}
.contact .row b{display:block;font-size:16px;font-weight:700;color:var(--text)}
.contact .row span{font-size:12px;color:var(--text-3)}
.qr-wrap{margin-top:10px;display:flex;flex-direction:column;align-items:center;gap:10px}
.qr{width:140px;height:140px;border-radius:14px;background:repeating-conic-gradient(#eef2f8 0% 25%,#0f1b36 0% 50%) 50%/24px 24px;border:5px solid #fff;box-shadow:var(--shadow-md)}

/* ===== Unified reveal animation (matches desktop site.css) ===== */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .55s cubic-bezier(.22,.61,.36,1),transform .55s cubic-bezier(.22,.61,.36,1);transition-delay:calc(var(--d,0)*60ms);will-change:opacity,transform}
.reveal.from-left{transform:translateX(-30px)}
.reveal.from-right{transform:translateX(30px)}
.reveal.from-scale{transform:scale(.94)}
.reveal.in{opacity:1;transform:none}
.reveal.in.from-left,.reveal.in.from-right,.reveal.in.from-scale{transform:none}

/* bottom nav */
.nav{position:fixed;left:50%;transform:translateX(-50%);width:100%;max-width:var(--maxw);bottom:0;z-index:70;
  display:flex;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--line);padding:7px 4px calc(7px + env(safe-area-inset-bottom))}
.nav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:5px 0;font-size:11px;color:var(--text-3);font-weight:600;transition:color .2s}
.nav a svg{width:23px;height:23px;transition:transform .2s}
.nav a:active svg{transform:scale(.9)}
.nav a.active{color:var(--primary)}
.nav a.active svg{color:var(--primary)}

/* floating join button */
.fab{position:fixed;left:50%;transform:translateX(-50%);
  bottom:calc(var(--nav-h) + 12px + env(safe-area-inset-bottom));z-index:80;
  width:calc(100% - 40px);max-width:calc(var(--maxw) - 40px);
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:var(--fab-h);border-radius:30px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;font-weight:700;font-size:16px;letter-spacing:1px;
  box-shadow:0 12px 30px rgba(38,116,241,.4);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 12px 30px rgba(38,116,241,.4)}
  50%{box-shadow:0 12px 30px rgba(38,116,241,.4),0 0 0 8px rgba(38,116,241,.10)}}
.fab svg{width:19px;height:19px}
.fab:active{filter:brightness(.96)}

@media (prefers-reduced-motion:reduce){
  .orb,.fab{animation:none!important}
  .reveal{opacity:1;transform:none;transition:none!important;will-change:auto}
  .feat,.prod,.nav a svg{transition:none!important}
  .prod:active{transform:none!important}
  .hero-visual img{animation:none!important}
  html{scroll-behavior:auto}
}