/* =========================================================
   NoseSwipe 官网 · 玻璃拟态 / 柔和渐变
   零依赖，零外部请求
   ========================================================= */

:root{
  --bg:#F2F4FD;
  --ink:#171B2B;
  --ink-2:#3A4159;
  --muted:#60688A;
  --blue:#5B7CFA;
  --violet:#9D5CFF;
  --gold:#F0B429;
  --green:#2FB463;
  --red:#F85149;

  --glass:rgba(255,255,255,.55);
  --glass-strong:rgba(255,255,255,.72);
  --glass-line:rgba(255,255,255,.9);
  --line:rgba(23,27,43,.10);

  --r-lg:28px;
  --r-md:20px;
  --r-sm:14px;
  --shadow:0 30px 60px -30px rgba(38,45,110,.45);
  --shadow-sm:0 12px 30px -18px rgba(38,45,110,.5);
  --grad:linear-gradient(120deg,var(--blue) 0%,var(--violet) 100%);
  --ease:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;scroll-padding-top:96px}

body{
  margin:0;
  font-family:"Segoe UI Variable Text","Segoe UI",-apple-system,BlinkMacSystemFont,
    "PingFang SC","HarmonyOS Sans SC","Microsoft YaHei UI","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  line-height:1.65;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
b{font-weight:700}
code{
  font-family:ui-monospace,"Cascadia Mono",Consolas,"SF Mono",monospace;
  font-size:.88em;background:rgba(91,124,250,.10);color:#3B4A9B;
  padding:.12em .42em;border-radius:7px;white-space:nowrap;
}

/* ---------------- 背景网格 ---------------- */
.mesh{position:fixed;inset:-10vh -10vw;z-index:-2;overflow:hidden;pointer-events:none}
.blob{
  position:absolute;display:block;border-radius:50%;
  filter:blur(72px);opacity:.55;
  animation:drift 26s var(--ease) infinite alternate;
}
.b1{width:44vw;height:44vw;left:-8vw;top:-6vh;background:radial-gradient(circle at 35% 35%,#8FA6FF,#C7D2FF 70%)}
.b2{width:38vw;height:38vw;right:-6vw;top:2vh;background:radial-gradient(circle at 60% 40%,#C9A2FF,#E7D6FF 70%);animation-delay:-6s}
.b3{width:34vw;height:34vw;left:22vw;bottom:-8vh;background:radial-gradient(circle at 50% 50%,#9BE7D4,#D9FBF0 70%);animation-delay:-12s}
.b4{width:26vw;height:26vw;right:14vw;bottom:6vh;background:radial-gradient(circle at 40% 60%,#FFD9A8,#FFF1DC 70%);animation-delay:-18s;opacity:.5}
.b5{width:30vw;height:30vw;left:38vw;top:24vh;background:radial-gradient(circle at 50% 50%,#FFC9E2,#FFE9F3 70%);animation-delay:-3s;opacity:.45}
@keyframes drift{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(3vw,-3vh,0) scale(1.12)}
}

.grain{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.22'/%3E%3C/svg%3E");
}

/* ---------------- 玻璃 ---------------- */
.glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(20px) saturate(165%);
  backdrop-filter:blur(20px) saturate(165%);
  border:1px solid var(--glass-line);
  box-shadow:var(--shadow);
}

/* ---------------- 按钮 ---------------- */
.btn{
  --bh:52px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:var(--bh);padding:0 26px;border-radius:999px;
  font-weight:700;font-size:16px;letter-spacing:.01em;
  border:1px solid transparent;cursor:pointer;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .3s;
  position:relative;overflow:hidden;white-space:nowrap;
}
.btn-primary{
  background:var(--grad);color:#fff;
  box-shadow:0 16px 34px -14px rgba(91,124,250,.85),inset 0 1px 0 rgba(255,255,255,.4);
}
.btn-primary::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(110deg,transparent 20%,rgba(255,255,255,.55) 45%,transparent 65%);
  transform:translateX(-120%);transition:transform .8s var(--ease);
}
.btn-primary:hover::after{transform:translateX(120%)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 24px 44px -16px rgba(120,90,255,.85)}
.btn-primary small{font-weight:500;opacity:.82;font-size:12px;letter-spacing:.02em}
.btn-ghost{
  background:var(--glass-strong);color:var(--ink);
  border-color:var(--glass-line);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  box-shadow:var(--shadow-sm);
}
.btn-ghost:hover{transform:translateY(-3px);background:rgba(255,255,255,.86)}
.btn-sm{--bh:40px;padding:0 18px;font-size:14px}
.btn-lg{--bh:58px;padding:0 34px;font-size:17px}
.btn:active{transform:translateY(-1px) scale(.98)}

/* ---------------- 导航 ---------------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;padding:16px 22px;transition:padding .4s var(--ease)}
.nav.shrunk{padding-top:8px}
.nav-inner{
  max-width:1180px;margin:0 auto;height:62px;border-radius:999px;
  display:flex;align-items:center;gap:20px;padding:0 10px 0 16px;
  box-shadow:0 18px 40px -28px rgba(38,45,110,.7);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em}
.brand img{border-radius:9px;box-shadow:0 6px 14px -6px rgba(91,124,250,.8)}
.brand-name{font-size:17px}
.brand-sub{font-size:12px;color:var(--muted);font-weight:600;padding-left:8px;border-left:1px solid var(--line)}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{
  padding:8px 14px;border-radius:999px;font-size:14.5px;font-weight:600;color:var(--ink-2);
  transition:background .25s,color .25s;
}
.nav-links a:hover{background:rgba(255,255,255,.75);color:var(--ink)}
.nav-links a.active{background:rgba(91,124,250,.14);color:#3E56C9}
.nav-cta{margin-left:6px}
.burger{display:none;width:42px;height:42px;border-radius:50%;border:1px solid var(--glass-line);
  background:rgba(255,255,255,.7);cursor:pointer;padding:0;place-items:center}
.burger i{display:block;width:16px;height:2px;background:var(--ink);border-radius:2px;margin:3px auto;transition:.3s var(--ease)}
.burger[aria-expanded="true"] i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.burger[aria-expanded="true"] i:nth-child(2){opacity:0}
.burger[aria-expanded="true"] i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------------- HERO ---------------- */
.hero{
  max-width:1180px;margin:0 auto;
  padding:172px 24px 90px;
  display:grid;grid-template-columns:1.06fr .94fr;gap:56px;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 16px 7px 12px;border-radius:999px;font-size:13.5px;font-weight:700;
  color:#3E56C9;background:rgba(255,255,255,.7);
  border:1px solid var(--glass-line);box-shadow:var(--shadow-sm);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(47,180,99,.2);animation:blink 2.4s infinite}
@keyframes blink{50%{box-shadow:0 0 0 8px rgba(47,180,99,0)}}

h1{
  font-size:clamp(42px,5.4vw,74px);
  line-height:1.06;letter-spacing:-.035em;font-weight:830;
  margin:22px 0 20px;
}
.grad{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  position:relative;
}
.lead{font-size:18px;color:var(--ink-2);max-width:35em;margin:0 0 30px}
.lead b{color:var(--ink);font-weight:700}
.cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}

.stats{display:flex;gap:10px;flex-wrap:wrap;list-style:none;padding:0;margin:0}
.stats li{
  flex:1 1 108px;min-width:104px;
  background:var(--glass);border:1px solid var(--glass-line);border-radius:var(--r-md);
  padding:14px 12px 12px;text-align:center;
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  box-shadow:var(--shadow-sm);
  transition:transform .4s var(--ease);
}
.stats li:hover{transform:translateY(-5px)}
.stats b{display:block;font-size:27px;letter-spacing:-.03em;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.15}
.stats span{font-size:12.5px;color:var(--muted);font-weight:600}

/* ---------------- 手机 ---------------- */
.hero-visual{display:flex;flex-direction:column;align-items:center;gap:16px;position:relative}
.phone{
  width:302px;padding:11px;border-radius:46px;position:relative;
  background:linear-gradient(160deg,#2A3050,#14172B 60%);
  border:1px solid rgba(255,255,255,.55);
  box-shadow:0 50px 80px -40px rgba(30,35,90,.75),0 0 0 8px rgba(255,255,255,.35);
  cursor:pointer;
  animation:float 7s ease-in-out infinite;
}
@keyframes float{50%{transform:translateY(-14px)}}
.phone-notch{position:absolute;top:19px;left:50%;transform:translateX(-50%);
  width:78px;height:20px;border-radius:12px;background:#0B0E1C;z-index:6}
.phone-screen{
  position:relative;border-radius:36px;overflow:hidden;
  aspect-ratio:9/19.2;background:linear-gradient(180deg,#171C38,#0C0F22);
  isolation:isolate;
}
/* 演示视频：铺满整个屏幕，圆角交给 .phone-screen 的 overflow:hidden */
.demo-video{
  position:absolute;inset:0;z-index:5;
  width:100%;height:100%;object-fit:cover;display:block;
  background:#0C0F22;
}
/* 视频能播就用视频，下面那套假 feed 藏起来；播不了（文件缺失/编码不认）自动退回假 feed */
.phone-screen.playing .feed{opacity:0;visibility:hidden;transition:opacity .4s var(--ease),visibility .4s}

.feed{position:absolute;inset:10px}
.reel{
  position:absolute;inset:0;border-radius:26px;padding:20px 18px 104px;color:#fff;
  display:flex;flex-direction:column;justify-content:flex-end;gap:4px;
  box-shadow:0 20px 40px -22px rgba(0,0,0,.8);
  transform:translateY(calc(var(--i,0) * 9px)) scale(calc(1 - var(--i,0) * .055));
  opacity:calc(1 - var(--i,0) * .22);
  filter:brightness(calc(1 - var(--i,0) * .16));
  z-index:calc(10 - var(--i,0));
  transition:transform .55s var(--ease),opacity .55s var(--ease),filter .55s var(--ease);
}
.reel::after{content:"";position:absolute;inset:0;border-radius:26px;
  background:linear-gradient(180deg,transparent 35%,rgba(6,8,20,.72));}
.reel>*{position:relative;z-index:1}
.reel h3{margin:0;font-size:21px;letter-spacing:-.02em}
.reel p{margin:0;font-size:12.5px;opacity:.8}
.reel-tag{
  align-self:flex-start;margin-bottom:auto;
  font-size:11px;font-weight:700;letter-spacing:.08em;
  background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.35);
  padding:4px 10px;border-radius:999px;backdrop-filter:blur(6px);
}
.r1{background:linear-gradient(150deg,#5B7CFA,#2B3AA8)}
.r2{background:linear-gradient(150deg,#9D5CFF,#5A2BB4)}
.r3{background:linear-gradient(150deg,#FF9C6B,#E0553F)}
.r4{background:linear-gradient(150deg,#2FC7A6,#117A72)}
.reel.is-out{transform:translateY(-128%) rotate(-6deg) scale(.9);opacity:0;transition:.5s cubic-bezier(.5,0,.75,0)}

.hud{
  position:absolute;left:12px;right:12px;bottom:12px;z-index:20;
  border-radius:18px;padding:11px 12px;
  background:rgba(10,13,30,.55);border:1px solid rgba(255,255,255,.22);
  box-shadow:0 14px 30px -16px rgba(0,0,0,.7);
  -webkit-backdrop-filter:blur(14px) saturate(150%);backdrop-filter:blur(14px) saturate(150%);
  color:#EAF0FF;font-family:ui-monospace,Consolas,"SF Mono",monospace;
}
.hud-row{display:grid;grid-template-columns:58px 1fr 46px;align-items:center;gap:8px;font-size:11.5px;margin-bottom:7px}
.hud-row .k{opacity:.72}
.hud-row .v{text-align:right;font-variant-numeric:tabular-nums;font-weight:700}
.bar{height:6px;border-radius:4px;background:rgba(255,255,255,.16);overflow:hidden;position:relative}
.bar i{position:absolute;inset:0 auto 0 0;width:78%;border-radius:4px;
  background:linear-gradient(90deg,#7E8CFF,#C08BFF);transition:width .12s linear,background .25s}
.bar i.hit{background:linear-gradient(90deg,#3FD68A,#8CF5C4)}
.hud-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:2px}
.pill{
  font-size:10.5px;font-weight:800;letter-spacing:.1em;padding:3px 9px;border-radius:999px;
  background:rgba(255,255,255,.14);color:#B9C4E8;transition:.25s;
}
.pill.touch{background:rgba(240,180,41,.22);color:#FFD54F}
.pill.fire{background:rgba(63,214,138,.24);color:#7CF0B4;box-shadow:0 0 16px rgba(63,214,138,.35)}
.hud-foot .meta{font-size:10px;opacity:.6;letter-spacing:.02em}

.toast{
  position:absolute;top:56px;left:50%;z-index:30;
  transform:translate(-50%,-14px) scale(.94);opacity:0;
  padding:9px 18px;border-radius:999px;font-size:13.5px;font-weight:800;color:#062A18;
  background:linear-gradient(120deg,#7CF0B4,#3FD68A);
  box-shadow:0 16px 30px -12px rgba(63,214,138,.7);
  transition:.38s var(--ease);white-space:nowrap;
}
.toast.show{transform:translate(-50%,0) scale(1);opacity:1}

.scanline{
  position:absolute;left:0;right:0;top:0;height:120px;z-index:15;pointer-events:none;
  background:linear-gradient(180deg,rgba(140,170,255,.22),transparent);
  border-bottom:1px solid rgba(160,190,255,.35);
  animation:scan 4.5s linear infinite;opacity:.75;
}
@keyframes scan{0%{transform:translateY(-130px)}100%{transform:translateY(560px)}}

.try{
  display:inline-flex;align-items:center;gap:9px;
  padding:12px 24px;border-radius:999px;font-size:15px;font-weight:700;
  background:rgba(255,255,255,.72);border:1px solid var(--glass-line);color:var(--ink);
  box-shadow:var(--shadow-sm);cursor:pointer;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.try:hover{transform:translateY(-3px);box-shadow:0 22px 40px -20px rgba(38,45,110,.6)}
.try-ico{font-size:18px}
.try-hint{font-size:13px;color:var(--muted);margin:0;text-align:center;max-width:320px}

/* ---------------- 通用区块 ---------------- */
.section{max-width:1180px;margin:0 auto;padding:86px 24px}
.sec-head{max-width:760px;margin-bottom:44px;position:relative}
.num{
  display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:.24em;
  color:#5A6BD8;background:rgba(91,124,250,.12);border:1px solid rgba(91,124,250,.24);
  padding:5px 12px;border-radius:999px;margin-bottom:16px;
}
.sec-head h2{font-size:clamp(30px,3.6vw,46px);line-height:1.14;letter-spacing:-.03em;margin:0 0 14px;font-weight:820}
.sec-head p{font-size:17px;color:var(--muted);margin:0;max-width:44em}
.muted{color:var(--muted)}
.small{font-size:14px}

.card{
  border-radius:var(--r-lg);padding:28px;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.card:hover{transform:translateY(-6px)}
.cards-2{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.card h3{font-size:25px;letter-spacing:-.02em;margin:0 0 8px;font-weight:800}
.card .muted{margin:0 0 6px;font-size:15.5px}
.arrow{color:var(--violet)}
.tag{
  font-size:12px;font-weight:800;letter-spacing:.06em;padding:5px 12px;border-radius:999px;
}
.tag-a{background:rgba(91,124,250,.16);color:#3E56C9;border:1px solid rgba(91,124,250,.3)}
.tag-b{background:rgba(157,92,255,.16);color:#7438D1;border:1px solid rgba(157,92,255,.3)}
.tag-soft{background:rgba(23,27,43,.06);color:var(--muted);font-weight:700;border:1px solid var(--line);margin-left:8px}

.gesture{margin:18px 0 0;padding:14px 10px 6px;border-radius:var(--r-md);
  background:linear-gradient(180deg,rgba(255,255,255,.6),rgba(255,255,255,.25));
  border:1px solid rgba(255,255,255,.85);overflow:hidden}
.gesture svg{width:100%;max-width:292px;height:auto;margin:0 auto;display:block}
.gesture figcaption{font-size:13px;color:var(--muted);text-align:center;padding:6px 0 8px;font-weight:600}

/* 手势 SVG */
.face ellipse:first-child{fill:rgba(255,255,255,.72);stroke:rgba(23,27,43,.28);stroke-width:1.6}
.face .brow,.face .nose-line,.face .mouth{fill:none;stroke:rgba(23,27,43,.5);stroke-width:2.4;stroke-linecap:round}
.face .eye{fill:rgba(23,27,43,.82)}
.face .target{fill:var(--blue);stroke:#fff;stroke-width:2.4}
.face .target-b{fill:var(--violet)}
.ring{fill:none;stroke:var(--blue);stroke-width:2;opacity:0;
  transform-box:fill-box;transform-origin:center;animation:ringPulse 3.6s ease-out infinite}
.ring-b{stroke:var(--violet)}
@keyframes ringPulse{0%,34%{opacity:0;transform:scale(.5)}44%{opacity:.9;transform:scale(.85)}70%,100%{opacity:0;transform:scale(1.5)}}

.gap{fill:none;stroke:rgba(23,27,43,.4);stroke-width:2;stroke-dasharray:4 6;stroke-linecap:round}
.gap-a{stroke-dasharray:46 46;animation:gapA 3.6s ease-in-out infinite}
.gap-b{stroke-dasharray:55 55;animation:gapB 3.6s ease-in-out infinite}
@keyframes gapA{0%,12%{stroke-dashoffset:0}40%,64%{stroke-dashoffset:46}92%,100%{stroke-dashoffset:0}}
@keyframes gapB{0%,12%{stroke-dashoffset:0}40%,64%{stroke-dashoffset:55}92%,100%{stroke-dashoffset:0}}

.hand polyline{fill:none;stroke:var(--violet);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;opacity:.75}
.hand .lm{fill:#fff;stroke:var(--violet);stroke-width:2}
.hand .tip{fill:#FFD54F;stroke:#fff;stroke-width:2.4;filter:drop-shadow(0 3px 6px rgba(240,180,41,.6))}
.hand-a{animation:handA 3.6s ease-in-out infinite}
.hand-b{animation:handB 3.6s ease-in-out infinite}
@keyframes handA{0%,12%{transform:translateY(52px)}40%,64%{transform:translateY(0)}92%,100%{transform:translateY(52px)}}
@keyframes handB{0%,12%{transform:translateY(60px)}40%,64%{transform:translateY(0)}92%,100%{transform:translateY(60px)}}
.ratio-tag{font-family:ui-monospace,Consolas,monospace;font-size:13px;font-weight:700;fill:#3E56C9}

.note{display:flex;gap:16px;align-items:flex-start;border-radius:var(--r-lg);padding:22px 26px;margin-top:26px}
.note-ico{font-size:22px;color:var(--violet);line-height:1.4}
.note p{margin:0;font-size:16px;color:var(--ink-2)}

/* ---------------- 卡片 / 面板 ---------------- */
.panel{border-radius:var(--r-lg);padding:28px}
.panel-h{font-size:20px;letter-spacing:-.02em;margin:0 0 10px;font-weight:800}
.panel>p{font-size:15.5px}

/* ---------------- 小卡片 ---------------- */
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:26px}
.mini{border-radius:var(--r-md);padding:20px 18px;transition:transform .45s var(--ease)}
.mini:hover{transform:translateY(-6px)}
.mini-n{font-size:11.5px;font-weight:800;letter-spacing:.16em;color:#7438D1;
  background:rgba(157,92,255,.13);border:1px solid rgba(157,92,255,.26);padding:3px 9px;border-radius:999px}
.mini h4{margin:12px 0 8px;font-size:16.5px;letter-spacing:-.01em}
.mini p{margin:0;font-size:14px;color:var(--muted)}
.mini code{font-size:12px}

/* ---------------- 隐私 ---------------- */
.privacy-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:start}
.panel.big h3{font-size:26px;letter-spacing:-.02em;margin:0 0 16px}
.perms{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.perm{font-size:15px;font-weight:700;padding:10px 18px;border-radius:999px;
  background:rgba(255,255,255,.7);border:1px solid var(--glass-line);box-shadow:var(--shadow-sm)}
.stack{display:grid;gap:18px;align-content:start}

/* ---------------- 步骤 ---------------- */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.step-item{border-radius:var(--r-lg);padding:22px 20px;display:flex;flex-direction:column;gap:14px;
  transition:transform .45s var(--ease)}
.step-item:hover{transform:translateY(-6px)}
.step-item>span{
  display:grid;place-items:center;width:38px;height:38px;border-radius:50%;
  background:var(--grad);color:#fff;font-weight:800;font-size:16px;
  box-shadow:0 12px 24px -12px rgba(120,90,255,.9);
}
.step-item h4{margin:0 0 6px;font-size:17px;letter-spacing:-.01em}
.step-item p{margin:0;font-size:14px;color:var(--muted)}

/* ---------------- FAQ ---------------- */
.faq{display:grid;gap:14px;max-width:900px}
.qa{border-radius:var(--r-md);overflow:hidden;transition:box-shadow .4s var(--ease)}
.qa summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:16px;
  padding:20px 24px;font-size:16.5px;font-weight:700;letter-spacing:-.01em;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary i{
  margin-left:auto;flex-shrink:0;width:26px;height:26px;border-radius:50%;position:relative;
  background:rgba(91,124,250,.14);transition:.35s var(--ease);
}
.qa summary i::before,.qa summary i::after{
  content:"";position:absolute;left:50%;top:50%;background:#3E56C9;border-radius:2px;
  transform:translate(-50%,-50%);transition:.35s var(--ease);
}
.qa summary i::before{width:11px;height:2px}
.qa summary i::after{width:2px;height:11px}
.qa[open] summary i{background:var(--grad);transform:rotate(180deg)}
.qa[open] summary i::before{background:#fff}
.qa[open] summary i::after{transform:translate(-50%,-50%) scaleY(0);background:#fff}
.qa .a{padding:0 24px 22px;font-size:15.5px;color:var(--muted);animation:fade .4s var(--ease)}
.qa .a p{margin:0 0 10px}
.qa .a p:last-child,.qa .a ul:last-child{margin-bottom:0}
.qa .a ul{margin:0;padding-left:20px}
.qa .a li{margin-bottom:6px}
@keyframes fade{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* ---------------- 下载 ---------------- */
.band{
  border-radius:38px;padding:44px 46px;display:flex;align-items:center;gap:32px;flex-wrap:wrap;
  background:linear-gradient(120deg,rgba(255,255,255,.72),rgba(255,255,255,.42));
  position:relative;overflow:hidden;
}
.band::before{
  content:"";position:absolute;width:420px;height:420px;right:-120px;top:-180px;border-radius:50%;
  background:radial-gradient(circle,rgba(157,92,255,.35),transparent 65%);pointer-events:none;
}
.band::after{
  content:"";position:absolute;width:340px;height:340px;left:-140px;bottom:-180px;border-radius:50%;
  background:radial-gradient(circle,rgba(91,124,250,.32),transparent 65%);pointer-events:none;
}
.band-icon{border-radius:20px;box-shadow:0 22px 44px -20px rgba(91,124,250,.9);flex-shrink:0}
.band-copy{flex:1 1 300px;position:relative;z-index:1}
.band-copy h2{font-size:clamp(26px,3vw,38px);letter-spacing:-.03em;margin:0 0 8px;font-weight:820}
.band-copy p{margin:0;color:var(--muted);font-size:15.5px;font-family:ui-monospace,Consolas,monospace}
.band-act{display:flex;gap:14px;flex-wrap:wrap;position:relative;z-index:1}

/* ---------------- 页脚 ---------------- */
.footer{padding:50px 24px 60px;border-top:1px solid rgba(23,27,43,.08);margin-top:40px;
  background:linear-gradient(180deg,rgba(255,255,255,0),rgba(255,255,255,.5))}
.foot-inner{max-width:1180px;margin:0 auto;text-align:center}
.foot-brand{display:flex;align-items:center;justify-content:center;gap:10px;font-weight:800;margin-bottom:10px}
.foot-brand img{border-radius:7px}
.footer p{margin:4px 0;font-size:14px;color:var(--ink-2)}

/* ---------------- 滚动出现 ---------------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------------- 响应式 ---------------- */
@media (max-width:1080px){
  .grid-5{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding-top:140px;text-align:center;gap:44px}
  .hero-copy{display:flex;flex-direction:column;align-items:center}
  .lead{margin-left:auto;margin-right:auto}
  .nav-links{
    position:absolute;top:78px;left:22px;right:22px;flex-direction:column;gap:2px;
    background:rgba(255,255,255,.85);border:1px solid var(--glass-line);border-radius:24px;
    padding:14px;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
    display:none;
  }
  .nav-links.open{display:flex;animation:fade .3s var(--ease)}
  .nav-links a{padding:12px 16px;font-size:16px}
  .burger{display:grid;margin-left:auto;order:3}
  .nav-cta{order:2;margin-left:auto}
  .cards-2,.privacy-grid{grid-template-columns:1fr}
  .band{padding:34px 26px;justify-content:center;text-align:center}
  .band-act{justify-content:center;width:100%}
}
/* ---------------- 手机端：整体收紧一档 ---------------- */
@media (max-width:640px){
  .section{padding:54px 20px}
  .sec-head{margin-bottom:26px}
  .sec-head h2{font-size:28px}
  .sec-head p{font-size:15.5px}
  .hero{padding:112px 20px 46px;gap:30px}
  .lead{font-size:16.5px;margin-bottom:24px}

  /* 标题：字号跟着屏宽走，别让「个。」孤零零换行 */
  h1{font-size:clamp(25px,7.6vw,34px);margin:18px 0 16px}

  .cta{gap:10px;margin-bottom:26px;width:100%;justify-content:center}
  .cta .btn{width:100%}
  .stats{gap:8px;width:100%}
  .stats li{min-width:calc(50% - 4px);padding:11px 8px 10px}
  .stats b{font-size:23px}
  .stats span{font-size:11.5px}
  .brand-sub{display:none}
  .nav{padding:12px 14px}
  .nav-cta{padding:0 13px;font-size:13px}

  /* 手机演示：240px 宽，别再占满一整屏 */
  .hero-visual{gap:12px}
  .phone{width:236px;padding:9px;border-radius:38px}
  .phone-screen{border-radius:30px}
  .phone-notch{width:62px;height:16px;top:15px;border-radius:10px}
  .feed{inset:8px}
  .reel{border-radius:22px;padding:15px 13px 84px}
  .reel h3{font-size:17px}
  .reel p{font-size:11.5px}
  .reel-tag{font-size:10px;padding:3px 8px}
  .hud{left:8px;right:8px;bottom:8px;padding:9px 10px;border-radius:15px}
  .hud-row{grid-template-columns:46px 1fr 38px;font-size:10px;gap:6px;margin-bottom:6px}
  .hud-foot .meta{font-size:9px}
  .pill{font-size:9.5px;padding:2px 8px}
  .toast{top:44px;font-size:12px;padding:7px 14px}
  .try{padding:10px 20px;font-size:14px}
  .try-hint{font-size:12.5px}

  /* 卡片：内边距和插图一起收 */
  .card{padding:20px}
  .card-top{margin-bottom:12px}
  .card h3{font-size:21px}
  .card .muted{font-size:14.5px}
  .gesture{margin-top:14px;padding:10px 8px 2px}
  .gesture svg{max-width:184px}
  .gesture figcaption{font-size:12px;padding:4px 0 6px}
  .note{padding:18px;gap:12px;margin-top:18px}
  .note-ico{font-size:18px}
  .note p{font-size:15px}

  .grid-5,.steps{grid-template-columns:1fr}
  .grid-5{gap:12px;margin-top:18px}
  .cards-2{gap:14px}
  .privacy-grid{gap:14px}
  .mini{padding:16px}
  .mini-n{display:none}
  .mini h4{font-size:16px;margin:0 0 5px}
  .mini p{font-size:13.5px}

  .panel{padding:20px}
  .panel-h{font-size:18px}
  .panel>p{font-size:14.5px}
  .panel.big h3{font-size:21px}
  .perms{gap:8px;margin-bottom:14px}
  .perm{font-size:13.5px;padding:8px 14px}
  .stack{gap:12px}

  /* 步骤：序号挪到左边，一步一行，别让圆圈独占一行 */
  .steps{gap:10px}
  .step-item{flex-direction:row;align-items:flex-start;gap:13px;padding:16px}
  .step-item>span{width:30px;height:30px;font-size:14px;flex-shrink:0}
  .step-item h4{font-size:16px;margin-bottom:3px}
  .step-item p{font-size:13.5px}

  .faq{gap:10px}
  .qa summary{padding:16px 18px;font-size:15.5px;gap:12px}
  .qa .a{padding:0 18px 18px;font-size:14.5px}

  .band{padding:26px 20px;gap:18px;border-radius:28px}
  .band-icon{width:58px;height:58px}
  .band-copy h2{font-size:24px}
  .band-copy p{font-size:12.5px}
  .band-act{flex-direction:column;gap:10px}
  .band-act .btn{width:100%}

  .footer{padding:38px 20px 46px;margin-top:26px}
  .footer p{font-size:13px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}