/* ============ 基础 ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#05070d;
  --bg-soft:#0a0e18;
  --card:rgba(255,255,255,.035);
  --card-hi:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.09);
  --line-hi:rgba(255,255,255,.16);
  --text:#edf1f8;
  --muted:#8a95ad;
  --muted-2:#66708a;
  --c1:#2ee6ff;   /* 极光青 */
  --c2:#5b8cff;   /* 电光蓝 */
  --c3:#a56bff;   /* 星云紫 */
  --grad:linear-gradient(100deg,#2ee6ff 0%,#5b8cff 45%,#a56bff 100%);
  --radius:20px;
  --max:1140px;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  letter-spacing:.01em;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
::selection{background:rgba(46,230,255,.28)}

/* ============ 背景光晕 ============ */
.aurora{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.aurora span{position:absolute;border-radius:50%;filter:blur(120px);opacity:.5}
.aurora .a1{width:620px;height:620px;top:-260px;left:-140px;background:radial-gradient(circle,rgba(46,230,255,.42),transparent 68%)}
.aurora .a2{width:700px;height:700px;top:-180px;right:-260px;background:radial-gradient(circle,rgba(91,140,255,.36),transparent 68%)}
.aurora .a3{width:760px;height:760px;top:520px;left:38%;background:radial-gradient(circle,rgba(165,107,255,.22),transparent 70%)}
.grid-bg{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,#000 20%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,#000 20%,transparent 80%);
}

/* ============ 布局 ============ */
.wrap{position:relative;z-index:1}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
section{position:relative;z-index:1}

/* ============ 导航 ============ */
.nav{
  position:sticky;top:0;z-index:100;
  backdrop-filter:saturate(180%) blur(22px);
  -webkit-backdrop-filter:saturate(180%) blur(22px);
  background:rgba(5,7,13,.72);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:0 24px;
  height:64px;display:flex;align-items:center;gap:20px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:26px;height:26px;border-radius:8px;background:var(--grad);
  position:relative;box-shadow:0 0 22px rgba(46,230,255,.45);
}
.brand-mark::after{
  content:"";position:absolute;inset:7px;border-radius:50%;
  background:var(--bg);
}
.brand-text{font-size:15.5px;font-weight:650;letter-spacing:-.01em;white-space:nowrap}
.brand-text em{font-style:normal;color:var(--muted);font-weight:450;margin-left:5px;font-size:13.5px}

.nav-links{
  display:flex;align-items:center;gap:2px;
  margin-left:auto;overflow-x:auto;scrollbar-width:none;
}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{
  font-size:13px;color:var(--muted);padding:8px 11px;border-radius:999px;
  white-space:nowrap;transition:color .22s,background .22s;
}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.06)}
.nav-cta{
  flex-shrink:0;font-size:13px;font-weight:600;padding:9px 16px;border-radius:999px;
  background:var(--grad);color:#04060c;white-space:nowrap;
  box-shadow:0 6px 26px rgba(46,230,255,.28);
  transition:transform .22s,box-shadow .22s;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 10px 34px rgba(46,230,255,.42)}

/* ============ Hero ============ */
.hero{padding:118px 0 96px;text-align:center}
.pill{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 16px 7px 9px;border-radius:999px;
  border:1px solid var(--line-hi);
  background:rgba(255,255,255,.035);
  font-size:12.5px;color:var(--muted);letter-spacing:.02em;
  margin-bottom:30px;
}
.pill i{
  width:6px;height:6px;border-radius:50%;background:var(--c1);
  box-shadow:0 0 10px var(--c1);animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}

h1{
  font-size:clamp(38px,6.6vw,74px);
  line-height:1.08;letter-spacing:-.035em;font-weight:760;
  margin-bottom:26px;
}
h1 .grad{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.hero .lead{
  font-size:clamp(16px,2.1vw,20px);color:#c3cbdc;font-weight:440;
  max-width:660px;margin:0 auto 16px;letter-spacing:-.005em;
}
.hero .sub{
  font-size:15px;color:var(--muted);max-width:640px;margin:0 auto 40px;
}
.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:14px 30px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform .24s cubic-bezier(.22,1,.36,1),box-shadow .24s,background .24s,border-color .24s;
  border:1px solid transparent;
}
.btn-primary{background:var(--grad);color:#04060c;box-shadow:0 10px 40px rgba(46,230,255,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 52px rgba(46,230,255,.48)}
.btn-ghost{border-color:var(--line-hi);background:rgba(255,255,255,.035);color:var(--text)}
.btn-ghost:hover{background:rgba(255,255,255,.08);transform:translateY(-2px)}
.btn svg{width:15px;height:15px;flex-shrink:0}

.note-region{
  font-size:12.5px;color:var(--muted-2);
  max-width:560px;margin:0 auto;
  padding:10px 18px;border-radius:12px;
  border:1px dashed rgba(255,255,255,.1);
}

.chips{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:46px}
.chip{
  font-size:13px;color:var(--muted);
  padding:8px 17px;border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.022);
  transition:color .22s,border-color .22s,background .22s;
}
.chip:hover{color:var(--text);border-color:var(--line-hi);background:rgba(255,255,255,.055)}

/* ============ 通用版块 ============ */
.sec{padding:96px 0}
.sec-head{max-width:760px;margin-bottom:56px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-block;font-size:12px;font-weight:650;
  letter-spacing:.16em;text-transform:uppercase;
  color:var(--c1);margin-bottom:16px;
}
h2{
  font-size:clamp(27px,4vw,42px);
  line-height:1.18;letter-spacing:-.028em;font-weight:720;
  margin-bottom:18px;
}
h2 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sec-head p{font-size:16px;color:var(--muted);max-width:640px}
.sec-head.center p{margin:0 auto}

/* ============ 卡片网格 ============ */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  position:relative;overflow:hidden;
  padding:30px 28px;border-radius:var(--radius);
  border:1px solid var(--line);
  background:var(--card);
  transition:transform .34s cubic-bezier(.22,1,.36,1),border-color .34s,background .34s;
}
.card:hover{transform:translateY(-4px);border-color:var(--line-hi);background:var(--card-hi)}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(46,230,255,.5),transparent);
  opacity:0;transition:opacity .34s;
}
.card:hover::before{opacity:1}
.card h3{font-size:17.5px;font-weight:650;letter-spacing:-.015em;margin-bottom:11px}
.card p{font-size:14.5px;color:var(--muted);line-height:1.72}

.idx{
  display:inline-flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:11px;
  font-size:13px;font-weight:700;
  background:rgba(46,230,255,.09);
  border:1px solid rgba(46,230,255,.22);
  color:var(--c1);
  margin-bottom:20px;
  font-variant-numeric:tabular-nums;
}
.idx.p2{background:rgba(91,140,255,.1);border-color:rgba(91,140,255,.25);color:#7ba4ff}
.idx.p3{background:rgba(165,107,255,.1);border-color:rgba(165,107,255,.25);color:#b98cff}

/* ============ 性能指标条 ============ */
.metrics{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  overflow:hidden;margin-top:56px;
}
.metric{padding:32px 26px;border-right:1px solid var(--line)}
.metric:last-child{border-right:none}
.metric .k{
  font-size:26px;font-weight:720;letter-spacing:-.03em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;margin-bottom:8px;
}
.metric .v{font-size:13.5px;color:var(--muted);line-height:1.6}

/* ============ 隐私 ============ */
.privacy-box{
  border:1px solid var(--line);border-radius:26px;overflow:hidden;
  background:linear-gradient(150deg,rgba(46,230,255,.055),rgba(165,107,255,.04) 55%,transparent);
  padding:56px 48px;
}
.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:38px}
.p-item{
  padding:22px 20px;border-radius:15px;
  border:1px solid rgba(255,255,255,.075);
  background:rgba(5,7,13,.5);
  transition:border-color .3s,background .3s;
}
.p-item:hover{border-color:rgba(46,230,255,.3);background:rgba(5,7,13,.75)}
.p-item .x{font-size:12px;color:#ff6b8a;font-weight:700;letter-spacing:.08em;margin-bottom:10px;display:block}
.p-item .t{font-size:14.5px;font-weight:600;color:var(--text);margin-bottom:5px}
.p-item .d{font-size:12.5px;color:var(--muted-2);line-height:1.6}

/* ============ 平台 ============ */
.plat{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.plat-card{
  padding:36px 30px;border-radius:var(--radius);
  border:1px solid var(--line);background:var(--card);
  transition:transform .34s cubic-bezier(.22,1,.36,1),border-color .34s,background .34s;
  display:flex;flex-direction:column;
}
.plat-card:hover{transform:translateY(-5px);border-color:var(--line-hi);background:var(--card-hi)}
.plat-tag{
  font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--c1);font-weight:650;margin-bottom:18px;
}
.plat-card h3{font-size:20px;font-weight:680;letter-spacing:-.02em;margin-bottom:12px}
.plat-card p{font-size:14.5px;color:var(--muted);flex:1}
.plat-link{
  margin-top:24px;font-size:13.5px;font-weight:600;color:var(--c1);
  display:inline-flex;align-items:center;gap:6px;
  transition:gap .25s;
}
.plat-card:hover .plat-link{gap:11px}

/* ============ 配置不变 ============ */
.keep{
  text-align:center;padding:100px 0;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:radial-gradient(ellipse 70% 100% at 50% 50%,rgba(91,140,255,.09),transparent 70%);
}
.keep h2{margin-bottom:20px}
.keep p{font-size:16.5px;color:var(--muted);max-width:600px;margin:0 auto}
.keep .quote{
  font-size:clamp(21px,3.2vw,30px);font-weight:680;letter-spacing:-.026em;
  line-height:1.4;margin-bottom:22px;color:var(--text);
}

/* ============ 开源 ============ */
.repo{
  display:flex;align-items:center;gap:22px;
  padding:28px 30px;border-radius:18px;
  border:1px solid var(--line);background:var(--card);
  transition:transform .3s,border-color .3s,background .3s;
}
.repo:hover{transform:translateX(5px);border-color:rgba(46,230,255,.3);background:var(--card-hi)}
.repo-icon{
  width:46px;height:46px;border-radius:13px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(46,230,255,.09);border:1px solid rgba(46,230,255,.2);
}
.repo-icon svg{width:22px;height:22px;stroke:var(--c1);fill:none;stroke-width:1.8}
.repo-body{flex:1;min-width:0}
.repo-body h3{font-size:16.5px;font-weight:650;margin-bottom:5px;letter-spacing:-.012em}
.repo-body code{
  font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  font-size:13px;color:var(--muted);word-break:break-all;
}
.repo-arrow{color:var(--muted-2);font-size:19px;flex-shrink:0;transition:color .3s,transform .3s}
.repo:hover .repo-arrow{color:var(--c1);transform:translateX(3px)}

/* ============ TestFlight ============ */
.tf{
  border-radius:28px;padding:64px 48px;text-align:center;
  border:1px solid var(--line);
  background:
    radial-gradient(ellipse 60% 120% at 50% 0%,rgba(46,230,255,.14),transparent 65%),
    linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.008));
}
.tf h2{margin-bottom:18px}
.tf p{color:var(--muted);max-width:580px;margin:0 auto 34px;font-size:15.5px}
.tf-warn{
  margin:26px auto 0;max-width:620px;font-size:13px;color:var(--muted-2);
  padding:13px 20px;border-radius:13px;
  border:1px solid rgba(255,107,138,.18);
  background:rgba(255,107,138,.05);
}
.tf-warn b{color:#ff8fa5;font-weight:600}

/* ============ 页脚 ============ */
footer{
  border-top:1px solid var(--line);
  padding:52px 0 44px;margin-top:96px;
  font-size:13.5px;color:var(--muted-2);
}
.foot-inner{
  display:flex;justify-content:space-between;align-items:center;
  gap:24px;flex-wrap:wrap;
}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{transition:color .24s}
.foot-links a:hover{color:var(--c1)}
.foot-brand{display:flex;align-items:center;gap:9px}
.foot-brand .brand-mark{width:20px;height:20px;border-radius:6px}
.foot-brand .brand-mark::after{inset:5.5px}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media(max-width:1080px){
  .nav-links a{font-size:12.5px;padding:8px 9px}
  .nav-inner{gap:14px}
}
@media(max-width:960px){
  .nav-links{display:none}
  .g4,.metrics,.privacy-grid{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(2){border-right:none}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--line)}
  .plat{grid-template-columns:1fr}
  .privacy-box{padding:40px 26px}
  .tf{padding:48px 24px}
}
@media(max-width:680px){
  .container,.nav-inner{padding:0 18px}
  .hero{padding:78px 0 66px}
  .sec{padding:70px 0}
  .g3,.g2,.g4,.metrics,.privacy-grid{grid-template-columns:1fr}
  .metric{border-right:none;border-bottom:1px solid var(--line)}
  .metric:last-child{border-bottom:none}
  .btn{width:100%;justify-content:center}
  .cta-row{flex-direction:column}
  .repo{flex-direction:column;text-align:center;align-items:center}
  .keep{padding:72px 0}
  footer{margin-top:70px}
}