:root{
  --sky:#e6eef8;
  --glow:#f4f8fc;
  --ink:#1c2a3d;
  --mute:#667890;
  --line:rgba(255,255,255,.55);
  --edge:rgba(70,110,170,.18);
  --blue:#3d78e3;
  --blue-deep:#2b5cbc;
  --glass:rgba(255,255,255,.42);
  --glass-strong:rgba(255,255,255,.62);
  --font:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --display:"Segoe UI Semilight","Segoe UI","PingFang SC",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);font-family:var(--font);line-height:1.65;
  background:
    radial-gradient(ellipse 60% 45% at 15% 5%,rgba(61,120,227,.18),transparent 55%),
    radial-gradient(ellipse 50% 40% at 90% 10%,rgba(140,180,230,.25),transparent 50%),
    radial-gradient(ellipse 70% 50% at 50% 100%,rgba(200,220,245,.5),transparent 60%),
    linear-gradient(165deg,#dfe9f6 0%,var(--sky) 40%,#edf3fa 100%);
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1120px,92%);margin:0 auto}

.glass{
  background:var(--glass);
  backdrop-filter:blur(18px) saturate(1.2);
  -webkit-backdrop-filter:blur(18px) saturate(1.2);
  border:1px solid var(--line);
  box-shadow:0 10px 40px rgba(28,42,61,.06),inset 0 1px 0 rgba(255,255,255,.65);
}

.oa-top{
  position:sticky;top:0;z-index:50;
  background:rgba(244,248,252,.72);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--edge);
}
.oa-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 0}
.brand{display:flex;align-items:center;gap:.7rem}
.brand-mark{
  width:2.15rem;height:2.15rem;border-radius:12px;display:grid;place-items:center;
  color:#fff;font-weight:700;
  background:linear-gradient(145deg,rgba(61,120,227,.95),rgba(90,150,235,.8));
  box-shadow:0 8px 20px rgba(61,120,227,.28);
}
.brand b{display:block;font-family:var(--display);font-size:1.05rem;font-weight:600;letter-spacing:.04em}
.brand small{display:block;font-size:.68rem;color:var(--mute);letter-spacing:.16em}
.nav{display:flex;flex-wrap:wrap;gap:.35rem .95rem;color:var(--mute);font-size:.92rem}
.nav a:hover,.nav a.on{color:var(--blue-deep)}
.nav-cta{
  padding:.45rem 1rem;border-radius:999px;color:#fff;
  background:linear-gradient(135deg,var(--blue),#5a96eb);
  white-space:nowrap;font-size:.9rem;
  box-shadow:0 6px 16px rgba(61,120,227,.25);
}
.upgrade-rail{
  display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;justify-content:center;
  padding:.55rem .8rem;border-top:1px solid var(--edge);
  font-size:.78rem;color:var(--mute);letter-spacing:.04em;
}
.upgrade-rail em{
  font-style:normal;padding:.2rem .55rem;border-radius:999px;
  background:rgba(255,255,255,.55);border:1px solid var(--edge);color:var(--blue-deep);
}
.upgrade-rail span{opacity:.45}

/* Hero — translucent OA deck */
.hero-oa{padding:2.8rem 0 2.2rem}
.hero-oa .hero-grid{
  display:grid;grid-template-columns:1.05fr .95fr;gap:2rem;align-items:center;
}
.chip{
  display:inline-flex;margin:0 0 .8rem;padding:.28rem .7rem;border-radius:999px;
  background:rgba(255,255,255,.5);border:1px solid var(--edge);
  color:var(--blue-deep);font-size:.78rem;letter-spacing:.08em;
}
.hero-oa h1{
  margin:0 0 .75rem;font-family:var(--display);font-weight:600;
  font-size:clamp(1.9rem,4vw,2.85rem);line-height:1.18;letter-spacing:.02em;color:var(--ink);
}
.lead{margin:0 0 1.25rem;color:var(--mute);max-width:34rem;font-size:1.02rem}
.actions{display:flex;flex-wrap:wrap;gap:.65rem;margin-bottom:1rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:9.4rem;padding:.74rem 1.2rem;border-radius:999px;
  font-size:.94rem;border:1px solid transparent;cursor:pointer;
  white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;
}
.btn-fill{
  background:linear-gradient(135deg,var(--blue),#5a96eb);color:#fff;
  box-shadow:0 8px 20px rgba(61,120,227,.28);
}
.btn-line{
  background:rgba(255,255,255,.45);backdrop-filter:blur(10px);
  color:var(--ink);border-color:var(--edge);
}
.btn:hover{filter:brightness(1.04)}
.req{
  display:grid;grid-template-columns:1fr 1fr;gap:.5rem;padding:.85rem;border-radius:16px;
}
.req p{margin:0;font-size:.84rem;color:var(--mute)}
.req b{color:var(--ink)}
.hero-media{align-self:center}
.media-glass{
  align-self:center;margin:0;padding:.55rem;overflow:visible;border-radius:22px;
}
.media-glass img{
  display:block;width:100%;height:auto;object-fit:contain;object-position:center;
  margin:0;padding:0;min-height:0;max-height:none;clip-path:none;transform:none;
  border-radius:16px;
}

.sec{padding:2.8rem 0}
.sec-h{margin-bottom:1.4rem;max-width:40rem}
.sec-h .k{margin:0 0 .35rem;font-size:.75rem;color:var(--blue);letter-spacing:.14em}
.sec-h h2{margin:0 0 .45rem;font-family:var(--display);font-size:clamp(1.4rem,2.5vw,1.9rem);font-weight:600}
.sec-h p{margin:0;color:var(--mute)}

/* Translucent download panes */
.pane-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.9rem}
.pane{
  display:flex;flex-direction:column;padding:1.15rem 1rem;border-radius:20px;
  position:relative;overflow:hidden;
}
.pane::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(160deg,rgba(255,255,255,.55),rgba(255,255,255,.2));
  pointer-events:none;
}
.pane > *{position:relative}
.pane .os{margin:0 0 .45rem;font-weight:700;font-size:1.05rem}
.pane .meta{margin:0 0 .18rem;font-size:.86rem;color:var(--mute)}
.pane .meta b{color:var(--ink);font-weight:600}
.pane .btn{margin-top:auto;width:100%;margin-top:1rem}

/* Feature frosted matrix */
.matrix{display:grid;grid-template-columns:repeat(5,1fr);gap:.75rem}
.matrix article{padding:1.1rem .95rem;border-radius:18px}
.matrix .ic{
  width:2.2rem;height:2.2rem;border-radius:12px;margin-bottom:.65rem;
  display:grid;place-items:center;color:var(--blue-deep);font-size:.78rem;font-weight:700;
  background:rgba(255,255,255,.55);border:1px solid var(--edge);
}
.matrix h3{margin:0 0 .35rem;font-size:.98rem;font-weight:600}
.matrix p{margin:0;font-size:.86rem;color:var(--mute)}

/* OA upgrade solution */
.upgrade-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:1.3rem;align-items:start}
.upgrade-copy{padding:1.4rem 1.3rem;border-radius:22px}
.upgrade-copy h2{margin:0 0 .7rem;font-family:var(--display);font-size:1.45rem;font-weight:600}
.upgrade-copy p{margin:0 0 .8rem;color:var(--mute)}
.path{
  display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:.4rem;align-items:center;margin-top:1.1rem;
}
.path .step{
  padding:.65rem .55rem;border-radius:12px;text-align:center;font-size:.82rem;color:var(--mute);
  background:rgba(255,255,255,.4);border:1px solid var(--edge);
}
.path .step b{display:block;color:var(--blue-deep);margin-bottom:.2rem;font-size:.78rem}
.path .arrow{color:var(--blue);opacity:.6}
.shots{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.shots figure{margin:0;border-radius:18px;overflow:hidden;padding:.4rem}
.shots img{width:100%;height:auto;object-fit:contain;object-position:center;border-radius:12px}

.trust{padding:2.2rem 0;text-align:center}
.trust-panel{padding:1.6rem 1.2rem;border-radius:24px;display:inline-block;min-width:min(100%,40rem)}
.trust strong{display:block;font-size:clamp(1.75rem,3.4vw,2.5rem);color:var(--blue-deep);margin-bottom:.25rem}
.trust .sub{color:var(--mute);margin-bottom:1rem}
.brands{display:flex;flex-wrap:wrap;justify-content:center;gap:.5rem}
.brands span{
  padding:.45rem .9rem;border-radius:999px;font-size:.88rem;
  background:rgba(255,255,255,.5);border:1px solid var(--edge);
}

.split{display:grid;grid-template-columns:1.1fr .9fr;gap:1rem}
.panel{padding:1.2rem 1.15rem;border-radius:20px}
.panel h2{margin:0 0 .9rem;font-size:1.2rem;font-weight:600}
.news{list-style:none;margin:0;padding:0;display:grid;gap:.7rem}
.news li{padding-bottom:.7rem;border-bottom:1px solid var(--edge)}
.news time{display:block;font-size:.75rem;color:var(--blue);margin-bottom:.2rem;letter-spacing:.04em}
.news a{font-weight:600}.news a:hover{color:var(--blue-deep)}
.news p{margin:.25rem 0 0;font-size:.86rem;color:var(--mute)}
.faq details{border-bottom:1px solid var(--edge);padding:.55rem 0}
.faq summary{cursor:pointer;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--blue)}
.faq details[open] summary::before{content:"− "}
.faq p{margin:.4rem 0 0;color:var(--mute);font-size:.9rem}
.thumbs{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.55rem;margin-top:1rem}
.thumbs figure{margin:0;border-radius:12px;overflow:hidden;padding:.3rem}
.thumbs img{width:100%;height:auto;object-fit:contain;border-radius:8px}

.cta-oa{padding:2.8rem 0 3.3rem}
.cta-box{padding:2rem 1.4rem;border-radius:28px;text-align:center;max-width:44rem;margin:0 auto}
.cta-box h2{margin:0 0 .55rem;font-family:var(--display);font-size:clamp(1.35rem,2.6vw,1.9rem);font-weight:600}
.cta-box > p{margin:0 0 1.15rem;color:var(--mute)}
.gains{list-style:none;margin:1.1rem 0 0;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:.45rem}
.gains li{
  padding:.35rem .7rem;border-radius:999px;font-size:.84rem;color:var(--mute);
  background:rgba(255,255,255,.45);border:1px solid var(--edge);
}

.foot{padding:1.3rem 0 1.7rem;color:var(--mute);font-size:.86rem}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.7rem;align-items:center}
.foot-links{display:flex;gap:1rem}
.foot-links a:hover{color:var(--blue-deep)}

@media (max-width:960px){
  .hero-oa .hero-grid,.upgrade-grid,.split,.pane-grid{grid-template-columns:1fr 1fr}
  .matrix{grid-template-columns:1fr 1fr}
  .path{grid-template-columns:1fr}
  .path .arrow{display:none}
}
@media (max-width:680px){
  .hero-oa .hero-grid,.upgrade-grid,.split,.pane-grid,.matrix,.shots,.thumbs,.req{grid-template-columns:1fr}
  .nav{display:none}
  .actions .btn{flex:1 1 100%}
}

.hero-oa .hero-grid{align-items:center}
.hero-oa .hero-media{align-self:center;margin:0;padding:0}
.hero-oa .media-glass{align-self:center;margin:0;overflow:visible}
.hero-oa .hero-media img{
  display:block;width:100%;height:auto;object-fit:contain;object-position:center;
  margin:0;padding:0;min-height:0;max-height:none;clip-path:none;transform:none;
}