/* R08 · 软件版本发布 / 骨架反解自 livesurface.com
   基因：冷灰场 · 蓝色单强调 · 产品窗口居中做主角 · 功能左右交替 · 三档定价 · 细线不用重影 */

:root{
  --bg:#f5f5f7;
  --bg-2:#ececf0;
  --card:#fefefe;
  --ink:#0b0b0d;
  --muted:#6e6e76;
  --line:#dcdce2;
  --blue:#0a5cff;
  --pad:clamp(20px,4vw,56px);
}

*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--ink);
  font-family:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--blue);color:#fff}
:focus-visible{outline:2px solid var(--blue);outline-offset:4px}

.mono{font-family:ui-monospace,"SFMono-Regular",Menlo,monospace;font-size:11.5px;letter-spacing:.02em}

/* 顶栏 */
.top{position:sticky;top:0;z-index:50;background:rgba(245,245,247,.82);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid var(--line)}
.top-in{max-width:1180px;margin:0 auto;padding:0 var(--pad);height:60px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{font-size:15px;font-weight:600;letter-spacing:-.02em;display:flex;align-items:center;gap:8px}
.brand .glyph{width:18px;height:18px;border-radius:5px;background:linear-gradient(140deg,#0a5cff,#4f8cff);position:relative}
.brand .glyph::after{content:"";position:absolute;inset:5px;border:1.4px solid #fff;border-radius:1px}
.nav{display:flex;gap:clamp(12px,2vw,26px);align-items:center}
.nav a{font-size:13px;color:var(--muted);transition:color .2s}
.nav a:hover,.nav a[aria-current]{color:var(--ink)}
.nav .cta{background:var(--ink);color:var(--bg);border-radius:999px;padding:7px 15px;font-size:12.5px;transition:opacity .2s}
.nav .cta:hover{opacity:.85}

/* 首屏 */
.hero{max-width:1180px;margin:0 auto;padding:clamp(34px,5vw,70px) var(--pad) clamp(24px,3vw,40px);text-align:center}
.badge{
  display:inline-flex;align-items:center;gap:8px;background:rgba(10,92,255,.08);color:var(--blue);
  border:1px solid rgba(10,92,255,.18);border-radius:999px;padding:6px 14px;font-size:12px;
}
.badge i{width:5px;height:5px;border-radius:50%;background:var(--blue);font-style:normal}
.hero h1{
  font-size:clamp(2.1rem,5.4vw,4.2rem);line-height:1.02;letter-spacing:-.045em;font-weight:600;
  margin:clamp(18px,2.4vw,28px) auto 0;max-width:18ch;
}
.hero .lede{margin:18px auto 0;max-width:54ch;color:var(--muted);font-size:clamp(15px,1.3vw,17px);line-height:1.7}
.hero-acts{margin-top:clamp(22px,3vw,32px);display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:11px 20px;font-size:13.5px;
  background:var(--blue);color:#fff;transition:transform .18s ease,box-shadow .18s ease;
  box-shadow:0 8px 20px -12px rgba(10,92,255,.8);
}
.btn:hover{transform:translateY(-1px);box-shadow:0 12px 26px -12px rgba(10,92,255,.9)}
.btn.ghost{background:var(--card);color:var(--ink);border:1px solid var(--line);box-shadow:none}
.btn.ghost:hover{border-color:#b9b9c2;box-shadow:none}
.hero .fine{margin-top:14px;font-size:11.5px;color:var(--muted)}

/* 产品窗口 */
.stage{max-width:1080px;margin:0 auto;padding:0 var(--pad) clamp(40px,6vw,84px)}
.win{
  background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:0 50px 100px -60px rgba(11,11,13,.55),0 2px 8px rgba(11,11,13,.05);
}
.win-bar{height:36px;display:flex;align-items:center;gap:7px;padding:0 13px;background:#f2f2f5;border-bottom:1px solid var(--line)}
.win-bar i{width:9px;height:9px;border-radius:50%;background:#d9d9df}
.win-bar i:nth-child(1){background:#f26a5a}
.win-bar i:nth-child(2){background:#f2be4f}
.win-bar i:nth-child(3){background:#5cc46a}
.win-bar .title{margin-left:10px;font-size:11px;color:var(--muted)}
.win-body{display:grid;grid-template-columns:168px 1fr;min-height:clamp(300px,38vw,420px)}
.win-side{border-right:1px solid var(--line);padding:12px 10px;background:#fafafc}
.win-side .grp{font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;color:#a3a3ad;padding:8px 8px 6px}
.win-side .it{display:flex;align-items:center;gap:8px;padding:7px 8px;border-radius:6px;font-size:12px;color:#4b4b55}
.win-side .it::before{content:"";width:12px;height:12px;border-radius:3px;background:#dcdce4;flex:none}
.win-side .it.on{background:rgba(10,92,255,.09);color:var(--blue)}
.win-side .it.on::before{background:var(--blue);opacity:.6}
.win-canvas{position:relative;background:#fdfdfe;overflow:hidden}
.win-canvas .grid-lines{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(11,11,13,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(11,11,13,.04) 1px,transparent 1px);
  background-size:28px 28px;
}
.win-canvas .obj{
  position:absolute;left:16%;top:22%;width:46%;height:52%;border-radius:4px;
  background:linear-gradient(150deg,#eef1f6,#dfe4ee 60%,#c7cfdd);
  box-shadow:0 18px 34px -20px rgba(11,11,13,.35);
}
.win-canvas .obj::after{
  content:"";position:absolute;left:12%;top:14%;width:52%;height:8%;border-radius:2px;background:rgba(10,92,255,.5);
}
.win-canvas .obj::before{
  content:"";position:absolute;left:12%;top:30%;width:70%;height:5%;border-radius:2px;background:rgba(11,11,13,.16);
  box-shadow:0 14px 0 -2px rgba(11,11,13,.1),0 28px 0 -2px rgba(11,11,13,.08);
}
.win-float{
  position:absolute;right:5%;bottom:8%;width:42%;background:rgba(255,255,255,.9);
  border:1px solid var(--line);border-radius:9px;padding:11px 12px;
  backdrop-filter:blur(10px);box-shadow:0 24px 40px -24px rgba(11,11,13,.4);
}
.win-float .lbl{font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.win-float .val{font-size:15px;letter-spacing:-.02em;margin-top:3px}
.win-float .bar{margin-top:9px;height:3px;border-radius:2px;background:#e6e6ec;overflow:hidden}
.win-float .bar span{display:block;height:100%;width:64%;background:var(--blue)}

/* 功能大卡 */
.sec{max-width:1180px;margin:0 auto;padding:clamp(40px,6vw,88px) var(--pad)}
.sec-head{max-width:56ch;margin-bottom:clamp(24px,3.4vw,44px)}
.sec-head .k{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.sec-head h2{font-size:clamp(1.5rem,3vw,2.4rem);line-height:1.12;letter-spacing:-.035em;font-weight:600;margin-top:10px}
.sec-head p{margin-top:12px;color:var(--muted);font-size:15px;line-height:1.75;max-width:52ch}

.feature{
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,4vw,56px);align-items:center;
  padding:clamp(22px,3vw,34px) 0;border-top:1px solid var(--line);
}
.feature:first-of-type{border-top:0}
.feature.rev .f-txt{order:2}
.f-txt h3{font-size:clamp(1.15rem,1.9vw,1.55rem);letter-spacing:-.03em;line-height:1.2;font-weight:600}
.f-txt .sub{font-size:12.5px;color:var(--muted);margin-top:6px}
.f-txt p{margin-top:12px;color:var(--muted);font-size:14.5px;line-height:1.8;max-width:46ch}
.f-shot{
  background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;
  aspect-ratio:16/10;position:relative;
}
.f-shot .inner{position:absolute;inset:0;background:#fbfbfd;overflow:hidden}
.f-shot .inner::before{
  content:"";position:absolute;left:10%;top:14%;width:56%;height:70%;border-radius:6px;
  background:linear-gradient(160deg,#e9edf6,#d3dae8);box-shadow:0 20px 40px -26px rgba(11,11,13,.4);
}
.f-shot .inner::after{
  content:"";position:absolute;right:8%;bottom:12%;width:34%;height:44%;border-radius:6px;
  background:rgba(255,255,255,.94);border:1px solid #e2e2ea;
  box-shadow:0 16px 30px -18px rgba(11,11,13,.3);
}

/* 小特性网格 */
.mini.two{grid-template-columns:repeat(2,1fr)}
.mini{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.mini div{background:var(--card);padding:clamp(16px,2vw,24px)}
.mini .ico{width:22px;height:22px;border-radius:6px;background:rgba(10,92,255,.1);position:relative;margin-bottom:12px}
.mini .ico::after{content:"";position:absolute;inset:6px;border:1.4px solid var(--blue);border-radius:2px}
.mini h4{font-size:13.5px;letter-spacing:-.01em;font-weight:600}
.mini p{font-size:12.5px;color:var(--muted);line-height:1.65;margin-top:6px}

/* 定价 */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,24px)}
.plan{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:clamp(20px,2.6vw,30px);
  display:flex;flex-direction:column;
}
.plan.pick{border-color:var(--blue);box-shadow:0 20px 44px -30px rgba(10,92,255,.6);position:relative}
.plan.pick::after{
  content:"最常选";position:absolute;top:-10px;left:20px;background:var(--blue);color:#fff;
  font-size:10px;letter-spacing:.1em;padding:3px 9px;border-radius:999px;
}
.plan .name{font-size:13px;color:var(--muted)}
.plan .price{font-size:clamp(1.7rem,2.8vw,2.2rem);letter-spacing:-.04em;font-weight:600;margin-top:8px;line-height:1}
.plan .price small{font-size:12px;font-weight:400;color:var(--muted);letter-spacing:0;margin-left:4px}
.plan ul{list-style:none;margin:18px 0 22px;display:grid;gap:9px;flex:1}
.plan li{font-size:13px;color:#4b4b55;line-height:1.5;padding-left:18px;position:relative}
.plan li::before{content:"";position:absolute;left:0;top:6px;width:9px;height:5px;border-left:1.4px solid var(--blue);border-bottom:1.4px solid var(--blue);transform:rotate(-45deg)}
.plan .btn{justify-content:center;background:var(--ink)}
.plan.pick .btn{background:var(--blue)}

/* FAQ */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:17px 0;display:flex;justify-content:space-between;gap:16px;font-size:14.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--muted);transition:transform .22s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{padding:0 0 18px;font-size:13.5px;color:var(--muted);line-height:1.8;max-width:70ch}

/* 尾部 CTA */
.tail{
  max-width:1180px;margin:0 auto clamp(40px,6vw,80px);padding:clamp(28px,4vw,52px);
  background:linear-gradient(150deg,#0b0b0d,#1b1b22);color:#fff;border-radius:18px;
  display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;
}
.tail h2{font-size:clamp(1.3rem,2.6vw,2rem);letter-spacing:-.035em;line-height:1.2;max-width:22ch;font-weight:600}
.tail p{font-size:13px;color:rgba(255,255,255,.6);margin-top:10px}
.tail .btn{background:#fbfbfd;color:var(--ink);box-shadow:none}

/* 页头 */
.phead{max-width:1180px;margin:0 auto;padding:clamp(34px,5vw,74px) var(--pad) clamp(20px,3vw,34px)}
.phead h1{font-size:clamp(2rem,5.4vw,3.8rem);line-height:1.02;letter-spacing:-.045em;font-weight:600;max-width:20ch}
.phead .sub{margin-top:16px;max-width:54ch;color:var(--muted);font-size:15.5px;line-height:1.75}

/* 页脚 */
.foot{border-top:1px solid var(--line);background:#efeff2;margin-top:clamp(30px,4vw,60px)}
.foot-in{max-width:1180px;margin:0 auto;padding:clamp(26px,3.6vw,44px) var(--pad);
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:clamp(18px,3vw,40px)}
.foot h4{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:500}
.foot ul{list-style:none;display:grid;gap:8px}
.foot a{font-size:12.5px;color:#55555f}
.foot a:hover{color:var(--ink)}
.foot p{font-size:12.5px;color:var(--muted);line-height:1.7;max-width:30ch}
.foot-btm{max-width:1180px;margin:0 auto;padding:14px var(--pad) 26px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:11px;color:var(--muted)}

.rv{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s cubic-bezier(.22,1,.36,1)}
.rv.in{opacity:1;transform:none}

@media (max-width:960px){
  .feature{grid-template-columns:1fr}
  .feature.rev .f-txt{order:0}
  .mini,.mini.two{grid-template-columns:1fr 1fr}
  .plans{grid-template-columns:1fr}
  .win-body{grid-template-columns:1fr}
  .win-side{display:none}
  .foot-in{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  .hero h1{font-size:clamp(1.9rem,8vw,2.6rem)}
  .mini,.mini.two{grid-template-columns:1fr}
  .nav a:not(.cta){display:none}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .rv{opacity:1;transform:none}
}