/* 落叶工具箱 · v5 精致版：克制的青蓝、留白、玻璃、微型动效 */
:root{
  --paper:#fbfdff;
  --paper-2:#f0f7fc;
  --ink:#08131c;
  --ink-2:#1b3140;
  --muted:#6c8798;
  --hair:rgba(8,25,38,.08);
  --hair-2:rgba(8,25,38,.14);
  --cyan:#00b8d9;
  --cyan-soft:#7fe3f2;
  --blue:#1668dc;
  --blue-soft:#9fc4ff;
  --radius-l:28px;
  --radius-m:18px;
  --radius-s:12px;
  --shadow-l:0 40px 90px -60px rgba(6,40,66,.55), 0 2px 6px rgba(6,40,66,.04);
  --shadow-m:0 20px 50px -38px rgba(6,40,66,.5);
  --ease:cubic-bezier(.22,.68,.18,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.72 -apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  letter-spacing:.005em;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(0,184,217,.22)}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;gap:28px;
  padding:0 max(24px, calc((100vw - 1120px)/2));
  height:64px;
  background:rgba(251,253,255,.72);
  backdrop-filter:saturate(180%) blur(22px);
  -webkit-backdrop-filter:saturate(180%) blur(22px);
  border-bottom:1px solid transparent;
  transition:border-color .4s var(--ease), background .4s var(--ease);
}
.nav.solid{border-bottom-color:var(--hair);background:rgba(251,253,255,.88)}
.logo{display:flex;align-items:center;gap:10px;font-weight:650;font-size:15.5px;letter-spacing:-.01em}
.logo .glyph{
  width:22px;height:22px;border-radius:7px;flex:none;
  background:linear-gradient(150deg,var(--cyan-soft),var(--cyan) 45%,var(--blue));
  box-shadow:0 6px 16px -8px rgba(0,184,217,.9);
  position:relative;
}
.logo .glyph::after{
  content:"";position:absolute;inset:5px 7px;
  border-radius:9px 2px 9px 2px;background:rgba(255,255,255,.92);
}
.nav .links{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav .links a{transition:color .25s var(--ease);position:relative}
.nav .links a:hover{color:var(--ink)}
.nav .dl{
  padding:8px 18px;border-radius:999px;font-size:13.5px;font-weight:600;color:#fff;
  background:linear-gradient(135deg,var(--cyan),var(--blue));
  box-shadow:0 10px 26px -14px rgba(22,104,220,.95);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.nav .dl:hover{transform:translateY(-1px);box-shadow:0 14px 32px -14px rgba(22,104,220,1)}

/* ---------- Hero ---------- */
.hero{
  position:relative;padding:150px 24px 96px;text-align:center;overflow:hidden;
  background:
    radial-gradient(760px 460px at 50% -8%, rgba(127,227,242,.42), transparent 68%),
    radial-gradient(620px 400px at 88% 6%, rgba(159,196,255,.34), transparent 66%),
    radial-gradient(520px 340px at 8% 12%, rgba(200,244,252,.42), transparent 70%),
    var(--paper);
}
.hero::after{
  content:"";position:absolute;left:50%;bottom:0;width:min(1120px,92%);height:1px;
  transform:translateX(-50%);background:linear-gradient(90deg,transparent,var(--hair-2),transparent);
}
.badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 10px;border-radius:999px;
  font-size:12.5px;color:#0a6c85;background:rgba(255,255,255,.75);
  border:1px solid rgba(0,184,217,.24);box-shadow:0 8px 24px -18px rgba(0,120,160,.8);
  backdrop-filter:blur(10px);
}
.badge .d{width:6px;height:6px;border-radius:50%;background:#22c58b;box-shadow:0 0 0 3px rgba(34,197,139,.18)}
.hero h1{
  margin:26px auto 20px;max-width:900px;font-size:clamp(36px,6.2vw,64px);
  line-height:1.1;letter-spacing:-.028em;font-weight:700;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(96deg,var(--cyan) 4%,var(--blue) 92%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .lede{max-width:600px;margin:0 auto 34px;color:var(--muted);font-size:17px;line-height:1.75}
.hero .acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:14px;
  font-size:15px;font-weight:600;transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .35s;
  will-change:transform;
}
.btn:hover{transform:translateY(-2px)}
.btn.solid{
  color:#fff;background:linear-gradient(135deg,var(--cyan),var(--blue));
  box-shadow:0 22px 44px -24px rgba(22,104,220,.9);
}
.btn.solid:hover{box-shadow:0 26px 54px -24px rgba(22,104,220,1)}
.btn.line{color:var(--ink);background:rgba(255,255,255,.9);border:1px solid var(--hair-2);box-shadow:var(--shadow-m)}
.hero .meta{margin-top:22px;font-size:12.5px;color:#93a9b8;letter-spacing:.02em}

/* ---------- 通用区块 ---------- */
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.sec{padding:96px 0}
.sec + .sec{border-top:1px solid var(--hair)}
.sec-head{max-width:660px;margin-bottom:44px}
.sec-head .eyebrow{
  font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
  font-weight:650;margin-bottom:12px;
}
.sec-head h2{
  font-size:clamp(25px,3.4vw,36px);line-height:1.24;letter-spacing:-.022em;
  margin:0 0 12px;font-weight:680;
}
.sec-head p{margin:0;color:var(--muted);font-size:15.5px}

/* 入场 */
.rise{opacity:0;transform:translateY(26px);
  transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rise.in{opacity:1;transform:none}

/* ---------- 版本卡 ---------- */
.plans{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.plan{
  position:relative;background:#fff;border:1px solid var(--hair);border-radius:var(--radius-l);
  padding:30px 28px;box-shadow:var(--shadow-m);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease),border-color .5s;
}
.plan:hover{transform:translateY(-4px);box-shadow:var(--shadow-l)}
.plan.pick{border-color:rgba(22,104,220,.26)}
.plan.pick::before{
  content:"";position:absolute;inset:-1px;border-radius:var(--radius-l);pointer-events:none;
  background:linear-gradient(150deg,rgba(0,184,217,.14),transparent 42%,rgba(22,104,220,.12));
}
.plan .top{display:flex;align-items:baseline;gap:10px;margin-bottom:4px}
.plan h3{margin:0;font-size:20px;letter-spacing:-.012em}
.plan .ver{font-size:12px;color:#9db2c1;font-variant-numeric:tabular-nums}
.plan .tag{color:var(--muted);font-size:13.5px;margin:0 0 20px}
.spec{list-style:none;margin:0 0 24px;padding:0;font-size:14.2px}
.spec li{display:flex;gap:10px;padding:9px 0;border-top:1px solid var(--hair);color:var(--ink-2)}
.spec li:first-child{border-top:0}
.spec li .k{color:var(--muted);min-width:74px;flex:none}
.spec li .v{flex:1}
.spec li b{font-weight:650;color:var(--ink)}
.plan .btn{width:100%;justify-content:center}
.plan .foot{margin-top:14px;font-size:12px;color:#9db2c1;text-align:center}
.chip{
  display:inline-block;padding:2px 9px;border-radius:6px;font-size:11.5px;font-weight:600;
  color:#0a6c85;background:rgba(0,184,217,.1);border:1px solid rgba(0,184,217,.22);
  vertical-align:2px;margin-left:2px;
}
.chip.blue{color:#1b4f9c;background:rgba(22,104,220,.09);border-color:rgba(22,104,220,.22)}

/* ---------- 软件目录 ---------- */
.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:22px}
.seg{
  display:inline-flex;padding:4px;border-radius:12px;background:var(--paper-2);border:1px solid var(--hair);
}
.seg button{
  border:0;background:transparent;padding:8px 16px;border-radius:9px;font:inherit;font-size:13.5px;
  color:var(--muted);cursor:pointer;transition:.3s var(--ease);font-weight:550;
}
.seg button.on{background:#fff;color:var(--ink);box-shadow:0 6px 18px -12px rgba(6,40,66,.8)}
.sfield{
  flex:1;min-width:180px;display:flex;align-items:center;gap:9px;
  padding:10px 14px;border-radius:12px;background:#fff;border:1px solid var(--hair);
}
.sfield input{border:0;outline:0;background:transparent;font:inherit;font-size:14px;width:100%;color:var(--ink)}
.sfield input::placeholder{color:#a9bcc9}

.apps{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:14px}
.app{
  display:flex;gap:14px;padding:16px;border-radius:var(--radius-m);background:#fff;
  border:1px solid var(--hair);box-shadow:0 1px 2px rgba(6,40,66,.03);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s;
}
.app:hover{transform:translateY(-3px);box-shadow:var(--shadow-m);border-color:var(--hair-2)}
/* 【v6】图标：容器带渐变底 + 居中首字母，img 绝对定位覆盖在上面。
   图片加载成功就完全盖住字母；加载失败/慢时露出字母，永远不会白块。 */
.app .ico{
  position:relative;
  width:52px;height:52px;border-radius:15px;flex:none;
  overflow:hidden;
  box-shadow:0 8px 20px -14px rgba(6,40,66,.8), 0 0 0 1px rgba(6,40,66,.05) 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;
  text-shadow:0 1px 2px rgba(0,0,0,.12);
}
.app .ico img{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;display:block;background:transparent;
}
.app .body{min-width:0;flex:1;display:flex;flex-direction:column}
.app h4{margin:0 0 2px;font-size:14.5px;font-weight:640;letter-spacing:-.008em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.app .ver{font-size:11.5px;color:#a2b6c4;font-variant-numeric:tabular-nums;margin-bottom:4px}
.app p{margin:0 0 10px;font-size:12.5px;color:var(--muted);line-height:1.55;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.app .get{
  align-self:flex-start;padding:7px 14px;border-radius:9px;font-size:12.5px;font-weight:600;
  color:#0d5f86;background:rgba(0,184,217,.1);border:1px solid rgba(0,184,217,.22);
  transition:.3s var(--ease);
}
.app .get:hover{background:linear-gradient(135deg,var(--cyan),var(--blue));color:#fff;border-color:transparent}
.app .get.wait{color:#93a9b8;background:var(--paper-2);border-color:var(--hair);cursor:not-allowed}
.apps-empty{grid-column:1/-1;text-align:center;color:var(--muted);font-size:14px;padding:40px 0}

/* ---------- 测速 ---------- */
.speed{
  display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;
  padding:34px 32px;border-radius:var(--radius-l);background:#fff;
  border:1px solid var(--hair);box-shadow:var(--shadow-m);
}
.speed .big{
  font-size:clamp(38px,5vw,54px);font-weight:700;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;line-height:1;
  background:linear-gradient(120deg,var(--cyan),var(--blue));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.speed .cap{color:var(--muted);font-size:13px;margin-top:8px}
.track{height:6px;border-radius:999px;background:var(--paper-2);overflow:hidden;margin-top:16px}
.track i{display:block;height:100%;width:0;border-radius:999px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));transition:width .25s linear}
.speed .side{font-size:13.5px;color:var(--muted)}
.speed .side .btn{margin-bottom:12px}

/* ---------- 页脚 ---------- */
.foot{border-top:1px solid var(--hair);padding:44px 24px 56px;text-align:center;color:var(--muted);font-size:13px}
.foot .row{display:flex;gap:22px;justify-content:center;margin-bottom:14px;flex-wrap:wrap}
.foot a{color:var(--ink-2)}
.foot .tiny{color:#a2b6c4;font-size:12px;margin-top:6px}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .plans,.speed{grid-template-columns:1fr}
  .speed{gap:22px}
}
@media (max-width:680px){
  .nav{padding:0 16px;height:58px;gap:14px}
  .nav .links{display:none}
  .hero{padding:112px 18px 66px}
  .hero .lede{font-size:15.5px}
  .sec{padding:66px 0}
  .wrap{padding:0 18px}
  .plan{padding:24px 20px;border-radius:22px}
  .apps{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .rise{opacity:1;transform:none}
}

/* ---------- 站点公告横幅 ---------- */
.announce{
  margin:16px auto 0;max-width:1120px;padding:0 24px;
}
.ann-inner{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px;
  padding:14px 20px;border-radius:14px;
  background:linear-gradient(90deg,rgba(0,184,217,.08),rgba(22,104,220,.06));
  border:1px solid rgba(0,184,217,.22);
  box-shadow:0 12px 30px -24px rgba(6,40,66,.5);
}
.announce.warn .ann-inner{background:linear-gradient(90deg,rgba(251,191,36,.10),rgba(245,158,11,.06));
  border-color:rgba(251,191,36,.32)}
.announce.ok .ann-inner{background:linear-gradient(90deg,rgba(52,211,153,.10),rgba(16,185,129,.06));
  border-color:rgba(52,211,153,.3)}
.ann-head{font-weight:650;font-size:14px;color:#0b5f78;flex:none}
.announce.warn .ann-head{color:#8a5a00}
.announce.ok .ann-head{color:#056b4d}
.ann-list{display:flex;flex-wrap:wrap;gap:4px 20px;margin:0;padding:0;list-style:none;flex:1;min-width:0}
.ann-list li{font-size:13.5px;color:var(--ink-2);position:relative;padding-left:12px}
.ann-list li::before{content:"";position:absolute;left:0;top:.62em;width:4px;height:4px;border-radius:50%;
  background:var(--cyan)}
.announce.warn .ann-list li::before{background:#f59e0b}
.announce.ok .ann-list li::before{background:#10b981}
.ann-link{font-size:13px;font-weight:600;color:var(--blue);white-space:nowrap}
.ann-link:hover{text-decoration:underline;text-underline-offset:3px}
@media (max-width:680px){
  .announce{padding:0 16px}
  .ann-inner{flex-direction:column;align-items:flex-start;gap:8px;padding:14px 16px}
  .ann-list{flex-direction:column;gap:4px}
}