/* 云语官方下载 · 夜空蝶翼
   零外部依赖：字体使用系统中文字体栈，图像仅本地 logo / 二维码。 */

:root{
  --bg:#07060f;
  --bg-2:#0b0918;
  --text:#f3f0ff;
  --muted:#a69fc8;
  --faint:#736c96;
  --line:rgba(255,255,255,.10);
  --line-soft:rgba(255,255,255,.06);
  --glass:rgba(255,255,255,.045);
  --violet:#8b6cff;
  --violet-deep:#6a4dff;
  --violet-soft:#c3a7ff;
  --cyan:#5ee0ff;
  --pink:#ff9ad5;
  --ok:#6ee7b7;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong","SimSun",serif;
  --sans:"PingFang SC","HarmonyOS Sans SC","MiSans","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --r-lg:28px;
  --r-md:18px;
  --maxw:1180px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
::selection{background:rgba(139,108,255,.4);color:#fff}

.skip{
  position:fixed;left:16px;top:-60px;z-index:99;
  padding:10px 16px;border-radius:12px;background:var(--violet);color:#fff;
  transition:top .2s;
}
.skip:focus{top:16px}

/* ---------- 背景 ---------- */
.scene{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;background:
  radial-gradient(1200px 800px at 78% -8%, #1b1140 0%, transparent 62%),
  radial-gradient(900px 700px at -10% 30%, #0d1733 0%, transparent 60%),
  linear-gradient(180deg,#08060f 0%,#07060f 45%,#090713 100%);
}
.aurora{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;mix-blend-mode:screen;will-change:transform}
.a1{width:52vw;height:52vw;right:-12vw;top:-18vw;background:radial-gradient(circle,rgba(124,92,255,.55),transparent 62%);animation:drift 22s ease-in-out infinite}
.a2{width:40vw;height:40vw;left:-14vw;top:34vh;background:radial-gradient(circle,rgba(94,224,255,.26),transparent 64%);animation:drift 28s ease-in-out infinite reverse}
.a3{width:36vw;height:36vw;right:6vw;bottom:-16vw;background:radial-gradient(circle,rgba(255,154,213,.18),transparent 64%);animation:drift 32s ease-in-out infinite}
@keyframes drift{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(-4vw,3vh,0) scale(1.08)}
}
.contours{
  position:absolute;inset:-20%;
  background:repeating-radial-gradient(circle at 74% 8%, transparent 0 96px, rgba(255,255,255,.026) 97px 98px);
  mask-image:radial-gradient(60% 55% at 70% 20%, #000 0%, transparent 78%);
  -webkit-mask-image:radial-gradient(60% 55% at 70% 20%, #000 0%, transparent 78%);
}
.butterfly{
  position:absolute;right:4vw;top:12vh;width:min(46vw,560px);opacity:.24;
  filter:blur(46px) saturate(1.5);
}
.butterfly img{width:100%;height:auto}
.grain{
  position:absolute;inset:0;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 顶栏 ---------- */
.topbar{
  position:relative;z-index:2;
  max-width:var(--maxw);margin:0 auto;
  padding:26px 28px;
  display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:12px;font-weight:600}
.brand img{width:38px;height:38px;border-radius:11px;box-shadow:0 8px 24px rgba(124,92,255,.35)}
.brand-name{font-size:17px;letter-spacing:.14em}
.brand-sub{font-size:9px;letter-spacing:.34em;color:var(--faint);transform:translateY(1px)}
.topnav{display:flex;gap:26px;margin-left:auto;font-size:13.5px;color:var(--muted)}
.topnav a{position:relative;padding:4px 0;transition:color .2s}
.topnav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--violet-soft);transition:right .25s}
.topnav a:hover{color:var(--text)}
.topnav a:hover::after{right:0}
.official{
  display:inline-flex;align-items:center;gap:7px;
  font-size:11.5px;letter-spacing:.08em;color:var(--violet-soft);
  border:1px solid rgba(139,108,255,.32);background:rgba(139,108,255,.08);
  padding:7px 12px;border-radius:999px;
}
.official i{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;z-index:2;
  max-width:var(--maxw);margin:0 auto;
  padding:clamp(20px,5vh,64px) 28px 40px;
  display:grid;grid-template-columns:1.04fr .96fr;align-items:center;gap:40px;
  min-height:calc(100vh - 110px);
}
.eyebrow{
  display:flex;align-items:center;gap:10px;
  margin:0 0 22px;font-size:12px;letter-spacing:.26em;color:var(--violet-soft);
}
.pulse{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 0 rgba(94,224,255,.6);animation:pulse 2.4s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(94,224,255,.55)}
  70%{box-shadow:0 0 0 12px rgba(94,224,255,0)}
  100%{box-shadow:0 0 0 0 rgba(94,224,255,0)}
}
h1{
  margin:0 0 24px;
  font-family:var(--serif);
  font-size:clamp(46px,6.1vw,84px);
  font-weight:600;
  line-height:1.1;
  letter-spacing:.015em;
}
h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--violet-soft) 0%,#e7d9ff 34%,var(--cyan) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 6px 30px rgba(139,108,255,.25));
}
.lede{
  margin:0 0 26px;max-width:33em;
  color:var(--muted);font-size:clamp(14.5px,1.25vw,16.5px);line-height:1.85;
}
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:32px}
.chips span{
  font-size:12.5px;letter-spacing:.03em;color:#d9d2f5;
  padding:6px 12px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.035);
  backdrop-filter:blur(8px);
}
.chips span:first-child{color:#fff;border-color:rgba(139,108,255,.4);background:rgba(139,108,255,.14)}
.cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.btn-primary{
  position:relative;overflow:hidden;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:58px;padding:0 30px;border-radius:999px;
  font-size:15.5px;font-weight:600;letter-spacing:.04em;color:#fff;
  background:linear-gradient(115deg,#9a7bff 0%,#7052ff 46%,#4ec8ff 125%);
  box-shadow:0 18px 44px -12px rgba(112,82,255,.75), inset 0 1px 0 rgba(255,255,255,.28);
  transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 24px 54px -12px rgba(112,82,255,.85), inset 0 1px 0 rgba(255,255,255,.3)}
.btn-primary:active{transform:translateY(0) scale(.99)}
.shine{
  position:absolute;top:-60%;bottom:-60%;left:-30%;width:34%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);
  transform:skewX(-18deg);animation:sheen 4.6s ease-in-out infinite;
}
@keyframes sheen{0%,55%{left:-40%}85%,100%{left:130%}}
.btn-ghost{
  display:inline-flex;align-items:center;gap:9px;
  height:58px;padding:0 24px;border-radius:999px;cursor:pointer;
  font-size:14px;color:#ded8f6;
  border:1px solid var(--line);background:rgba(255,255,255,.04);
  backdrop-filter:blur(10px);
  transition:border-color .2s,background .2s,transform .2s;
}
.btn-ghost:hover{border-color:rgba(195,167,255,.5);background:rgba(255,255,255,.07);transform:translateY(-1px)}
.hint{margin:16px 0 0;font-size:12px;color:var(--faint);letter-spacing:.02em}

/* ---------- 手机模型 ---------- */
.hero-device{position:relative;display:flex;justify-content:center;align-items:center;min-height:600px}
.halo{
  position:absolute;width:min(460px,88%);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle,rgba(139,108,255,.34) 0%,rgba(94,224,255,.10) 42%,transparent 68%);
  filter:blur(20px);animation:breathe 7s ease-in-out infinite;
}
@keyframes breathe{0%,100%{opacity:.75;transform:scale(1)}50%{opacity:1;transform:scale(1.05)}}
.phone{
  position:relative;width:352px;max-width:86vw;aspect-ratio:352/720;
  padding:10px;border-radius:48px;
  background:linear-gradient(155deg,#2a2444,#0e0b1c 38%,#161029 100%);
  border:1px solid rgba(255,255,255,.16);
  box-shadow:
    0 50px 100px -30px rgba(0,0,0,.9),
    0 0 0 1px rgba(0,0,0,.6),
    inset 0 1px 1px rgba(255,255,255,.22);
  transform:rotate(-3.5deg);transition:transform .6s cubic-bezier(.2,.8,.2,1);
}
.hero-device:hover .phone{transform:rotate(0deg) translateY(-4px)}
.phone::before{
  content:"";position:absolute;left:50%;top:14px;transform:translateX(-50%);
  width:104px;height:26px;border-radius:0 0 16px 16px;background:#08060f;z-index:3;
}
.phone-screen{
  height:100%;border-radius:38px;overflow:hidden;position:relative;
  background:
    radial-gradient(120% 60% at 80% 0%,rgba(139,108,255,.22),transparent 60%),
    linear-gradient(180deg,#100c22,#0b0917 60%,#0a0814);
  display:flex;flex-direction:column;
}
.statusbar{display:flex;justify-content:space-between;align-items:center;padding:16px 22px 4px;font-size:11px;color:#cfc9ea;font-weight:600}
.sb-right{display:flex;align-items:center;gap:5px}
.sig,.wifi,.batt{display:inline-block;background:#cfc9ea;border-radius:1px;opacity:.85}
.sig{width:12px;height:8px;clip-path:polygon(0 100%,20% 100%,20% 62%,0 62%,0 100%,33% 100%,33% 42%,53% 42%,53% 100%,66% 100%,66% 22%,86% 22%,86% 100%,100% 100%,100% 0,100% 100%)}
.wifi{width:11px;height:8px;border-radius:2px;clip-path:polygon(50% 100%,0 0,100% 0)}
.batt{width:18px;height:9px;border-radius:2.5px;border:1px solid #cfc9ea;background:linear-gradient(90deg,#cfc9ea 72%,transparent 72%);background-clip:content-box;padding:1px;opacity:.9}
.chat-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line-soft)}
.avatar{width:34px;height:34px;border-radius:11px;box-shadow:0 4px 14px rgba(124,92,255,.4)}
.who{display:flex;flex-direction:column;line-height:1.25}
.who b{font-size:13px;letter-spacing:.02em}
.who span{font-size:10px;color:var(--muted);display:flex;align-items:center;gap:5px}
.online{width:5px;height:5px;border-radius:50%;background:var(--ok);box-shadow:0 0 6px var(--ok)}
.head-actions{margin-left:auto;display:flex;gap:14px;color:#bbb4d8}
.chat-body{flex:1;padding:14px 14px 8px;display:flex;flex-direction:column;gap:9px;overflow:hidden}
.day{align-self:center;font-size:9.5px;color:var(--faint);letter-spacing:.08em;margin-bottom:2px}
.msg{display:flex}
.msg.right{justify-content:flex-end}
.bubble{
  max-width:78%;padding:9px 12px;font-size:12.5px;line-height:1.5;
  border-radius:15px 15px 15px 5px;
  background:rgba(255,255,255,.075);color:#e9e4ff;
  border:1px solid rgba(255,255,255,.05);
}
.msg.right .bubble{
  border-radius:15px 15px 5px 15px;
  background:linear-gradient(135deg,#8b6cff,#6244f0);
  color:#fff;border-color:transparent;
  box-shadow:0 8px 22px -8px rgba(110,76,255,.8);
}
.call-card{
  display:flex;align-items:center;gap:10px;
  margin:4px 0;padding:10px 12px;border-radius:15px;
  background:rgba(139,108,255,.13);border:1px solid rgba(139,108,255,.28);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08);
}
.call-ic{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--violet);color:#fff;flex:none;box-shadow:0 0 16px rgba(139,108,255,.55)}
.call-meta{display:flex;flex-direction:column;line-height:1.3}
.call-meta b{font-size:11.5px}
.call-meta span{font-size:9.5px;color:var(--violet-soft)}
.wave{margin-left:auto;display:flex;align-items:center;gap:3px;height:20px}
.wave i{display:block;width:2.5px;height:7px;border-radius:2px;background:var(--cyan);animation:wave 1.1s ease-in-out infinite}
.wave i:nth-child(2){animation-delay:.12s}
.wave i:nth-child(3){animation-delay:.24s}
.wave i:nth-child(4){animation-delay:.36s}
.wave i:nth-child(5){animation-delay:.48s}
@keyframes wave{0%,100%{height:6px;opacity:.55}50%{height:18px;opacity:1}}
.chat-input{
  margin:8px 12px 16px;height:38px;border-radius:999px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 8px 0 14px;font-size:11.5px;color:var(--faint);
  background:rgba(255,255,255,.055);border:1px solid var(--line-soft);
}
.plus{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--violet);color:#fff;font-size:15px;line-height:1}
.float-card{
  position:absolute;display:flex;align-items:center;gap:10px;
  padding:11px 15px;border-radius:16px;
  background:rgba(16,13,32,.66);border:1px solid rgba(255,255,255,.13);
  backdrop-filter:blur(18px);
  box-shadow:0 24px 50px -18px rgba(0,0,0,.85);
  animation:float 6s ease-in-out infinite;
}
.fc1{left:-46px;top:19%}
.fc2{right:-40px;bottom:17%;animation-delay:-3s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}
.fc-ic{display:grid;place-items:center;width:30px;height:30px;border-radius:10px;background:rgba(139,108,255,.2);color:var(--violet-soft);flex:none}
.fc2 .fc-ic{background:rgba(94,224,255,.14);color:var(--cyan)}
.fc-txt{display:flex;flex-direction:column;line-height:1.35}
.fc-txt b{font-size:11.5px;color:#f0ecff;letter-spacing:.02em}
.fc-txt span{font-size:9.5px;color:var(--faint)}

/* ---------- 二维码条 ---------- */
.qr-strip{
  position:relative;z-index:2;
  max-width:var(--maxw);margin:0 auto 30px;
  padding:22px 26px;border-radius:var(--r-lg);
  display:flex;align-items:center;gap:22px;
  background:linear-gradient(120deg,rgba(255,255,255,.055),rgba(255,255,255,.02));
  border:1px solid var(--line);
  box-shadow:0 30px 70px -40px rgba(0,0,0,.9);
}
.qr-box{width:104px;height:104px;flex:none;background:#fff;border-radius:14px;padding:8px;box-shadow:0 10px 30px -10px rgba(0,0,0,.6)}
.qr-copy h2{margin:0 0 4px;font-size:17px;font-family:var(--serif);font-weight:600;letter-spacing:.02em}
.qr-copy p{margin:0;font-size:13px;color:var(--muted)}
.mono{font-family:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;font-size:.94em;color:#dcd5ff;background:rgba(139,108,255,.12);padding:1px 6px;border-radius:6px;white-space:nowrap}

/* ---------- 通用 section ---------- */
section{position:relative;z-index:2}
.features,.steps,.faq{max-width:var(--maxw);margin:0 auto;padding:70px 28px}
.section-head{max-width:640px;margin-bottom:38px}
.section-head .eyebrow{margin-bottom:14px}
.section-head h2{
  margin:0;font-family:var(--serif);font-weight:600;
  font-size:clamp(28px,3.4vw,44px);line-height:1.28;letter-spacing:.01em;
  text-wrap:balance;
}
.section-head h2 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--violet-soft),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}

/* ---------- 特性 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.fcard{
  padding:26px 22px 24px;border-radius:22px;
  background:linear-gradient(165deg,rgba(255,255,255,.055),rgba(255,255,255,.015));
  border:1px solid var(--line);
  transition:transform .3s cubic-bezier(.2,.8,.2,1),border-color .3s,box-shadow .3s;
}
.fcard:hover{transform:translateY(-5px);border-color:rgba(139,108,255,.42);box-shadow:0 26px 60px -30px rgba(112,82,255,.55)}
.f-ic{
  display:grid;place-items:center;width:46px;height:46px;border-radius:14px;margin-bottom:18px;
  background:radial-gradient(circle at 30% 20%,rgba(139,108,255,.35),rgba(139,108,255,.08));
  border:1px solid rgba(139,108,255,.25);color:var(--violet-soft);
}
.fcard:nth-child(2) .f-ic{color:var(--cyan);background:radial-gradient(circle at 30% 20%,rgba(94,224,255,.28),rgba(94,224,255,.05));border-color:rgba(94,224,255,.22)}
.fcard:nth-child(3) .f-ic{color:var(--pink);background:radial-gradient(circle at 30% 20%,rgba(255,154,213,.24),rgba(255,154,213,.05));border-color:rgba(255,154,213,.2)}
.fcard h3{margin:0 0 8px;font-size:16px;letter-spacing:.02em}
.fcard p{margin:0;font-size:12.8px;line-height:1.75;color:var(--muted)}

/* ---------- 步骤 ---------- */
.step-list{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
}
.step-list li{position:relative;padding-top:26px;border-top:1px solid var(--line)}
.step-list .num{
  display:block;margin-bottom:16px;
  font-family:var(--serif);font-size:46px;line-height:1;font-weight:600;
  color:transparent;-webkit-text-stroke:1px rgba(195,167,255,.5);
}
.step-list h3{margin:0 0 6px;font-size:16.5px}
.step-list p{margin:0;font-size:13px;color:var(--muted);line-height:1.75}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{
  list-style:none;cursor:pointer;position:relative;
  padding:20px 44px 20px 0;font-size:15px;font-weight:500;letter-spacing:.01em;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{
  content:"";position:absolute;right:6px;top:50%;width:11px;height:11px;
  border-right:1.5px solid var(--violet-soft);border-bottom:1.5px solid var(--violet-soft);
  transform:translateY(-70%) rotate(45deg);transition:transform .3s;
}
.faq-list details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq-list details p{margin:0 0 22px;max-width:760px;font-size:13.5px;line-height:1.85;color:var(--muted)}

/* ---------- 页脚 ---------- */
.footer{
  position:relative;z-index:2;
  max-width:var(--maxw);margin:20px auto 0;padding:30px 28px 46px;
  border-top:1px solid var(--line-soft);
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  font-size:12px;color:var(--faint);
}
.foot-brand{display:flex;align-items:center;gap:10px;color:#cfc8ec;font-size:13px;letter-spacing:.06em}
.foot-brand img{width:26px;height:26px;border-radius:8px}
.footer p{margin:0}
.footer .copy{margin-left:auto}

/* ---------- 入场动画 ---------- */
.js .reveal{opacity:0;transform:translateY(20px)}
.js .reveal.in{animation:rise .9s cubic-bezier(.2,.75,.2,1) forwards;animation-delay:var(--d,0s)}
@keyframes rise{to{opacity:1;transform:translateY(0)}}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,24px);
  z-index:60;padding:11px 20px;border-radius:999px;
  font-size:13px;color:#fff;background:rgba(28,22,52,.9);border:1px solid rgba(139,108,255,.4);
  box-shadow:0 18px 44px -14px rgba(0,0,0,.8);backdrop-filter:blur(14px);
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .float-card{display:none}
  .hero{grid-template-columns:1fr;gap:8px;min-height:0;padding-top:24px}
  .hero-device{min-height:0;margin-top:26px;padding-bottom:10px}
  .phone{width:330px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .topnav{display:none}
  .official{margin-left:auto}
  .hero{padding:18px 20px 30px}
  .qr-strip{margin:0 20px 20px;padding:18px}
  .features,.steps,.faq{padding:52px 20px}
  .step-list{grid-template-columns:1fr;gap:10px}
  .step-list li{padding:18px 0 6px}
  .step-list .num{font-size:34px;margin-bottom:8px}
  .footer{padding:26px 20px 40px}
  .footer .copy{margin-left:0;width:100%}
}
@media (max-width:560px){
  .topbar{padding:18px 20px}
  .brand-sub{display:none}
  h1{font-size:clamp(42px,12vw,54px)}
  .lede br{display:none}
  .cta{align-items:stretch;flex-direction:column}
  .btn-primary,.btn-ghost{width:100%;justify-content:center}
  .chips{gap:7px}
  .chips span{font-size:11.5px;padding:5px 10px}
  .qr-strip{align-items:flex-start}
  .qr-box{width:82px;height:82px;padding:6px;border-radius:11px}
  .qr-copy h2{font-size:15px}
  .qr-copy p{font-size:12px}
  .feature-grid{grid-template-columns:1fr}
  .fcard{padding:22px 20px}
  .phone{width:300px;border-radius:42px}
  .phone-screen{border-radius:33px}
  .footer{font-size:11.5px;gap:10px}
}

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