/* 落叶防格机 · v8 精修版 */
:root{
  --paper:#ffffff;
  --paper-2:#f5fafd;
  --paper-3:#eef6fb;
  --ink:#07141d;
  --ink-2:#1a3140;
  --ink-3:#3d5a6b;
  --muted:#71899a;
  --faint:#9db2c0;
  --hair:rgba(7,20,29,.075);
  --hair-2:rgba(7,20,29,.13);
  --cyan:#00b4d8;
  --cyan-2:#48cae4;
  --cyan-3:#90e0ef;
  --blue:#1668dc;
  --blue-2:#4d8df0;
  --r-xl:26px;
  --r-md:16px;
  --r-sm:10px;
  --sh-1:0 1px 2px rgba(7,20,29,.04), 0 8px 24px -18px rgba(7,20,29,.22);
  --sh-2:0 2px 6px rgba(7,20,29,.05), 0 20px 48px -32px rgba(7,20,29,.3);
  --sh-3:0 4px 12px rgba(7,20,29,.06), 0 32px 72px -40px rgba(7,20,29,.34);
  --ease:cubic-bezier(.22,.72,.18,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-rendering:optimizeLegibility}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.68 -apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei UI","Microsoft YaHei",system-ui,sans-serif;
  letter-spacing:.006em;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;font-feature-settings:"tnum" 0;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;
  background:rgba(0,180,216,.08);color:#0b6480;padding:.12em .42em;border-radius:5px;
  border:1px solid rgba(0,180,216,.14)}
::selection{background:rgba(0,180,216,.2)}

/* ---------- 顶栏 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:80;
  display:flex;align-items:center;gap:26px;
  padding:0 max(22px,calc((100vw - 1140px)/2));
  height:62px;
  background:transparent;
  transition:background .45s var(--ease),border-color .45s var(--ease),backdrop-filter .45s;
  border-bottom:1px solid transparent;
}
.nav.pin{
  background:rgba(255,255,255,.78);
  backdrop-filter:saturate(190%) blur(20px);
  -webkit-backdrop-filter:saturate(190%) blur(20px);
  border-bottom-color:var(--hair);
}
.logo{display:flex;align-items:center;gap:9px;font-weight:660;font-size:15.5px;letter-spacing:-.012em;flex:none}
.logo .glyph{
  width:23px;height:23px;border-radius:8px;position:relative;flex:none;
  background:linear-gradient(145deg,var(--cyan-3) 0%,var(--cyan) 48%,var(--blue) 100%);
  box-shadow:0 5px 14px -7px rgba(0,180,216,.95),inset 0 1px 0 rgba(255,255,255,.5);
}
.logo .glyph::after{
  content:"";position:absolute;inset:5px 7px;
  border-radius:8px 1px 8px 1px;background:rgba(255,255,255,.95);
}
.nav .links{display:flex;gap:24px;margin-left:auto;font-size:13.8px;color:var(--muted);font-weight:500}
.nav .links a{position:relative;padding:4px 0;transition:color .28s var(--ease)}
.nav .links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:-2px;height:1.5px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  transition:right .35s var(--ease-out);border-radius:2px;
}
.nav .links a:hover{color:var(--ink)}
.nav .links a:hover::after{right:0}
.nav .cta{
  padding:8px 17px;border-radius:999px;font-size:13.2px;font-weight:620;color:#fff;
  background:linear-gradient(135deg,var(--cyan),var(--blue));
  box-shadow:0 10px 24px -13px rgba(22,104,220,.95);
  transition:transform .3s var(--ease-out),box-shadow .3s var(--ease-out);
}
.nav .cta:hover{transform:translateY(-1.5px);box-shadow:0 14px 30px -13px rgba(22,104,220,1)}

/* ---------- Hero ---------- */
.hero{
  position:relative;padding:140px 24px 84px;text-align:center;overflow:hidden;isolation:isolate;
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(680px 420px at 50% -6%,rgba(144,224,239,.5),transparent 70%),
    radial-gradient(520px 360px at 84% 4%,rgba(180,214,255,.42),transparent 68%),
    radial-gradient(460px 320px at 12% 16%,rgba(224,247,252,.6),transparent 72%),
    linear-gradient(180deg,var(--paper-2) 0%,var(--paper) 62%);
}
.hero::after{
  content:"";position:absolute;left:50%;bottom:0;width:min(1140px,94%);height:1px;
  transform:translateX(-50%);
  background:linear-gradient(90deg,transparent,var(--hair-2) 22%,var(--hair-2) 78%,transparent);
}
.tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 14px 6px 11px;border-radius:999px;font-size:12.2px;font-weight:530;
  color:#0a6a84;background:rgba(255,255,255,.8);
  border:1px solid rgba(0,180,216,.22);
  box-shadow:0 8px 22px -18px rgba(0,120,160,.7);
  backdrop-filter:blur(8px);
}
.tag .pulse{
  width:6px;height:6px;border-radius:50%;background:#12c98a;flex:none;
  box-shadow:0 0 0 0 rgba(18,201,138,.55);
  animation:pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(18,201,138,.5)}
  60%{box-shadow:0 0 0 7px rgba(18,201,138,0)}
  100%{box-shadow:0 0 0 0 rgba(18,201,138,0)}
}
.hero h1{
  margin:26px auto 20px;max-width:840px;
  font-size:clamp(34px,5.9vw,62px);line-height:1.09;letter-spacing:-.032em;font-weight:720;
}
.hero h1 em{
  font-style:normal;display:inline-block;
  background:linear-gradient(94deg,var(--cyan) 6%,var(--blue) 96%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .sub{
  max-width:588px;margin:0 auto 32px;color:var(--ink-3);font-size:16.6px;line-height:1.76;
}
.hero .sub b{color:var(--ink);font-weight:620}
.acts{display:flex;gap:11px;justify-content:center;align-items:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 25px;border-radius:13px;font-size:14.8px;font-weight:620;
  /* 关键：不让 flex 容器把它压扁或拉高 */
  flex:0 0 auto;
  white-space:nowrap;
  line-height:1.15;
  min-width:132px;
  transition:transform .32s var(--ease-out),box-shadow .32s var(--ease-out),background .32s;
  will-change:transform;
}
.btn:hover{transform:translateY(-2px)}
.btn.pri{
  color:#fff;background:linear-gradient(135deg,var(--cyan),var(--blue));
  box-shadow:0 20px 40px -22px rgba(22,104,220,.95),inset 0 1px 0 rgba(255,255,255,.24);
}
.btn.pri:hover{box-shadow:0 26px 50px -22px rgba(22,104,220,1),inset 0 1px 0 rgba(255,255,255,.3)}
.btn.ghost{
  color:var(--ink);background:#fff;border:1px solid var(--hair-2);
  box-shadow:var(--sh-1);
}
.btn.ghost:hover{box-shadow:var(--sh-2);border-color:rgba(0,180,216,.35)}
.hero .meta{margin-top:20px;font-size:12.4px;color:var(--faint);letter-spacing:.01em}

/* ---------- 区块 ---------- */
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
.sec{padding:88px 0}
.sec+.sec{border-top:1px solid var(--hair)}
.head{max-width:640px;margin-bottom:40px}
.head .eb{
  font-size:11.5px;letter-spacing:.17em;text-transform:uppercase;
  color:var(--cyan);font-weight:680;margin-bottom:11px;
  display:flex;align-items:center;gap:8px;
}
.head .eb::before{content:"";width:16px;height:1.5px;background:var(--cyan);border-radius:2px}
.head h2{
  font-size:clamp(24px,3.3vw,35px);line-height:1.26;letter-spacing:-.024em;
  margin:0 0 11px;font-weight:690;
}
.head p{margin:0;color:var(--muted);font-size:15.4px;line-height:1.72}

/* ---------- 版本卡 ---------- */
.plans{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.plan{
  position:relative;background:#fff;border:1px solid var(--hair);
  border-radius:var(--r-xl);padding:28px 26px;box-shadow:var(--sh-1);
  transition:transform .45s var(--ease-out),box-shadow .45s var(--ease-out),border-color .45s;
}
.plan:hover{transform:translateY(-5px);box-shadow:var(--sh-3)}
.plan.hot{border-color:rgba(0,180,216,.3)}
.plan.hot::before{
  content:"";position:absolute;inset:0;border-radius:var(--r-xl);pointer-events:none;
  background:linear-gradient(155deg,rgba(0,180,216,.07),transparent 46%,rgba(22,104,220,.05));
}
.plan .hd{display:flex;align-items:baseline;gap:9px;margin-bottom:3px}
.plan h3{margin:0;font-size:19.5px;letter-spacing:-.014em;font-weight:680}
.plan .ver{font-size:11.5px;color:var(--faint);font-variant-numeric:tabular-nums;font-weight:520}
.plan .lead{color:var(--muted);font-size:13.2px;margin:0 0 18px}
.spec{list-style:none;margin:0 0 22px;padding:0;font-size:14px}
.spec li{
  display:flex;gap:9px;padding:8.5px 0;border-top:1px solid var(--hair);
  color:var(--ink-2);align-items:flex-start;
}
.spec li:first-child{border-top:0}
.spec li .k{color:var(--muted);min-width:70px;flex:none;font-size:13.4px}
.spec li .v{flex:1}
.spec li b{font-weight:650;color:var(--ink)}
.pill{
  display:inline-block;padding:1.5px 8px;border-radius:5px;font-size:11px;font-weight:620;
  color:#0a6a84;background:rgba(0,180,216,.09);border:1px solid rgba(0,180,216,.2);
  vertical-align:1.5px;margin-left:3px;
}
.pill.b{color:#1a4f9c;background:rgba(22,104,220,.07);border-color:rgba(22,104,220,.18)}
.plan .btn{width:100%}
.plan .foot{margin-top:13px;font-size:11.6px;color:var(--faint);text-align:center}

/* ---------- 应用目录 ---------- */
.bar{display:flex;gap:11px;flex-wrap:wrap;align-items:center;margin-bottom:20px}
.seg{
  display:inline-flex;padding:3.5px;border-radius:11px;
  background:var(--paper-2);border:1px solid var(--hair);
}
.seg button{
  border:0;background:transparent;padding:7.5px 15px;border-radius:8px;
  font:inherit;font-size:13.2px;color:var(--muted);cursor:pointer;
  transition:.32s var(--ease-out);font-weight:560;
}
.seg button.on{
  background:#fff;color:var(--ink);
  box-shadow:0 4px 14px -9px rgba(7,20,29,.5),0 1px 2px rgba(7,20,29,.05);
}
.sfield{
  flex:1;min-width:170px;display:flex;align-items:center;gap:8px;
  padding:10px 14px;border-radius:11px;background:#fff;border:1px solid var(--hair);
  transition:border-color .3s,box-shadow .3s;
}
.sfield:focus-within{border-color:rgba(0,180,216,.45);box-shadow:0 0 0 3px rgba(0,180,216,.1)}
.sfield input{border:0;outline:0;background:transparent;font:inherit;font-size:13.6px;width:100%;color:var(--ink)}
.sfield input::placeholder{color:var(--faint)}

.apps{display:grid;grid-template-columns:repeat(auto-fill,minmax(262px,1fr));gap:12px}
.app{
  display:flex;gap:13px;padding:15px;border-radius:var(--r-md);background:#fff;
  border:1px solid var(--hair);
  transition:transform .38s var(--ease-out),box-shadow .38s var(--ease-out),border-color .38s;
}
.app:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:var(--hair-2)}
.app .ico{
  position:relative;width:50px;height:50px;border-radius:14px;flex:none;overflow:hidden;
  box-shadow:0 6px 16px -11px rgba(7,20,29,.85),0 0 0 1px rgba(7,20,29,.045) inset;
}
.app .ico .fch{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-size:17px;font-weight:700;color:#fff;letter-spacing:-.02em;
}
.app .ico img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.app .bd{min-width:0;flex:1;display:flex;flex-direction:column}
.app h4{
  margin:0 0 1px;font-size:14.3px;font-weight:640;letter-spacing:-.008em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.app .v{font-size:11px;color:var(--faint);font-variant-numeric:tabular-nums;margin-bottom:3px}
.app p{
  margin:0 0 9px;font-size:12.3px;color:var(--muted);line-height:1.55;flex:1;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.app .get{
  align-self:flex-start;padding:6.5px 13px;border-radius:8px;
  font-size:12.2px;font-weight:620;color:#0a6a84;
  background:rgba(0,180,216,.08);border:1px solid rgba(0,180,216,.2);
  transition:.3s var(--ease-out);
}
.app .get:hover{
  background:linear-gradient(135deg,var(--cyan),var(--blue));
  color:#fff;border-color:transparent;
  box-shadow:0 8px 18px -11px rgba(22,104,220,.9);
}
.app .get.wait{
  color:var(--faint);background:var(--paper-2);border-color:var(--hair);cursor:not-allowed;
}
.empty{grid-column:1/-1;text-align:center;color:var(--muted);font-size:13.5px;padding:44px 0}

/* ---------- 测速 ---------- */
.speed{
  display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;
  padding:32px 30px;border-radius:var(--r-xl);background:#fff;
  border:1px solid var(--hair);box-shadow:var(--sh-2);
}
.speed .big{
  font-size:clamp(36px,4.8vw,52px);font-weight:730;letter-spacing:-.032em;
  font-variant-numeric:tabular-nums;line-height:1;
  background:linear-gradient(118deg,var(--cyan),var(--blue));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.speed .cap{color:var(--muted);font-size:12.6px;margin-top:8px}
.track{height:5px;border-radius:999px;background:var(--paper-3);overflow:hidden;margin-top:15px}
.track i{
  display:block;height:100%;width:0;border-radius:999px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  transition:width .22s linear;
}
.speed .side{font-size:13.2px;color:var(--muted);line-height:1.7}
.speed .side .btn{margin-bottom:11px;width:100%}

/* ---------- 页脚 ---------- */
.foot{
  border-top:1px solid var(--hair);padding:42px 24px 54px;text-align:center;
  color:var(--muted);font-size:12.8px;background:linear-gradient(180deg,transparent,rgba(0,180,216,.025));
}
.foot .row{display:flex;gap:20px;justify-content:center;margin-bottom:13px;flex-wrap:wrap}
.foot a{color:var(--ink-2);transition:color .25s}
.foot a:hover{color:var(--cyan)}
.foot .tiny{color:var(--faint);font-size:11.5px;margin-top:5px;font-variant-numeric:tabular-nums}

/* ---------- 入场 ---------- */
.up{opacity:0;transform:translateY(22px);
  transition:opacity .85s var(--ease-out),transform .85s var(--ease-out)}
.up.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:920px){
  .plans,.speed{grid-template-columns:1fr}
  .speed{gap:20px;padding:26px 22px}
}
@media (max-width:700px){
  .nav{padding:0 15px;height:56px;gap:12px}
  .nav .links{display:none}
  .hero{padding:104px 17px 58px}
  .hero .sub{font-size:15.2px}
  .sec{padding:60px 0}
  .wrap{padding:0 17px}
  .plan{padding:22px 19px;border-radius:21px}
  .apps{grid-template-columns:1fr}
  .head{margin-bottom:30px}
  .foot{padding:34px 17px 44px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .up{opacity:1;transform:none}
}