/* ---------- 首页 landing（移动优先）---------- */
.land{min-height:100vh}
.land-top{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;position:sticky;top:0;z-index:20;background:rgba(11,14,18,.72);backdrop-filter:blur(10px)}
.land-logo{font-weight:700;letter-spacing:3px;font-size:16px}
.land-logo span{display:block;font-size:10px;letter-spacing:2.5px;color:var(--muted);font-weight:400;margin-top:2px}
button.sm{padding:6px 12px;font-size:13px}

.hero{position:relative;padding:46px 22px 34px;text-align:center;overflow:hidden}
.hero-glow{position:absolute;top:-140px;left:50%;transform:translateX(-50%);width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(62,166,255,.35),rgba(62,166,255,0) 65%);filter:blur(10px);pointer-events:none}
.hero h1{position:relative;font-size:34px;line-height:1.28;font-weight:800;letter-spacing:1px}
.hero h1 em{font-style:normal;background:linear-gradient(92deg,#3ea6ff,#7ee0c0 70%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{position:relative;margin-top:14px;color:#9fb0c0;font-size:13.5px;line-height:1.85}
.hero-actions{position:relative;margin-top:24px;display:flex;flex-direction:column;gap:12px;align-items:center}
.cta{border-radius:26px;padding:14px 34px;font-size:15.5px;font-weight:700;color:#04121d;
  background:linear-gradient(96deg,#7ee0c0,#3ea6ff);box-shadow:0 10px 30px rgba(62,166,255,.28)}
.cta:active{transform:translateY(1px)}
.hero-link{color:var(--muted);font-size:13px}
.hero-badges{position:relative;margin-top:20px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;color:#6f8296;font-size:12px}

.feat{padding:8px 18px 4px;display:grid;gap:12px}
.feat-item{background:linear-gradient(180deg,rgba(31,38,46,.9),rgba(23,28,34,.9));border:1px solid var(--line);border-radius:16px;padding:18px}
.feat-ico{font-size:20px;color:#7ee0c0;margin-bottom:8px}
.feat-item b{font-size:15.5px}
.feat-item p{margin-top:6px;color:var(--muted);font-size:13px;line-height:1.75}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:22px 18px;text-align:center}
.stats b{display:block;font-size:22px;background:linear-gradient(180deg,#fff,#9fb0c0);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{font-size:11.5px;color:var(--muted)}

.how{padding:6px 18px 24px}
.how h2{font-size:18px;margin-bottom:14px;letter-spacing:1px}
.how ol{list-style:none;display:grid;gap:14px}
.how li{display:flex;gap:12px;align-items:flex-start}
.how i{flex:0 0 26px;height:26px;border-radius:50%;display:grid;place-items:center;font-style:normal;font-size:13px;
  background:rgba(62,166,255,.14);color:#7ee0c0;border:1px solid rgba(62,166,255,.3)}
.how b{font-size:14.5px}
.how p{color:var(--muted);font-size:12.5px;margin-top:3px}

.land-foot{margin-top:10px;padding:0 18px 34px}
.foot-cta{background:linear-gradient(135deg,rgba(62,166,255,.14),rgba(126,224,192,.1));border:1px solid rgba(62,166,255,.25);
  border-radius:16px;padding:20px;text-align:center}
.foot-cta b{display:block;font-size:16px;margin-bottom:14px}
.copy{text-align:center;color:#4d5b68;font-size:11px;margin-top:22px}

@media (min-width:760px){
  .hero{padding:70px 22px 44px}
  .hero h1{font-size:44px}
  .feat{grid-template-columns:repeat(3,1fr);max-width:1000px;margin:0 auto}
  .how{max-width:640px;margin:0 auto}
  .land-foot{max-width:1000px;margin:0 auto}
}