:root{
  --bg:#08090d;
  --bg-soft:#0e1016;
  --card:rgba(255,255,255,.035);
  --card-line:rgba(255,255,255,.08);
  --txt:#f2f3f7;
  --txt-dim:#9ba0ad;
  --accent:#ff7a5c;
  --accent-2:#ff4f6b;
  --accent-soft:rgba(255,122,92,.14);
  --radius:20px;
  --maxw:1160px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
svg{width:100%;height:100%;display:block}

/* 背景光晕 */
.glow{position:fixed;border-radius:50%;filter:blur(120px);pointer-events:none;z-index:0}
.glow-1{width:620px;height:620px;top:-220px;right:-160px;background:radial-gradient(circle,rgba(255,110,80,.22),transparent 70%)}
.glow-2{width:520px;height:520px;top:820px;left:-220px;background:radial-gradient(circle,rgba(255,79,107,.14),transparent 70%)}

/* 导航 */
.nav{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;gap:32px;
  padding:18px max(24px,calc((100vw - var(--maxw))/2));
  transition:background .25s ease,border-color .25s ease,backdrop-filter .25s;
  border-bottom:1px solid transparent;
}
.nav.is-stuck{
  background:rgba(8,9,13,.82);
  backdrop-filter:blur(14px);
  border-bottom-color:var(--card-line);
}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:18px;letter-spacing:.5px}
.brand img{width:34px;height:34px;border-radius:10px}
.nav-links{display:flex;gap:28px;margin-left:auto;font-size:15px;color:var(--txt-dim)}
.nav-links a{transition:color .2s}
.nav-links a:hover{color:var(--txt)}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 26px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid var(--card-line);color:var(--txt);
  transition:transform .18s ease,box-shadow .25s ease,background .2s,border-color .2s;
  white-space:nowrap;
}
.btn .ico{width:18px;height:18px}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-lg{padding:16px 40px;font-size:17px}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  border-color:transparent;color:#fff;
  box-shadow:0 10px 30px -12px rgba(255,90,90,.75);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 38px -12px rgba(255,90,90,.85)}
.btn-ghost{background:var(--card);color:var(--txt-dim)}
.btn-ghost:hover{color:var(--txt);border-color:rgba(255,255,255,.2)}

/* Hero */
main{position:relative;z-index:1}
.hero{
  max-width:var(--maxw);margin:0 auto;
  padding:70px 24px 90px;
  display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;
}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 15px;border-radius:999px;
  background:var(--accent-soft);border:1px solid rgba(255,122,92,.25);
  color:#ffb3a0;font-size:13px;font-weight:500;letter-spacing:.3px;
}
.badge .dot{width:6px;height:6px;border-radius:50%;background:#5ddba0;box-shadow:0 0 0 3px rgba(93,219,160,.18)}
.hero h1{
  margin:22px 0 18px;
  font-size:clamp(38px,5.4vw,64px);line-height:1.12;font-weight:800;letter-spacing:-1px;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{color:var(--txt-dim);font-size:17px;max-width:520px}
.hero-actions{display:flex;gap:14px;margin:32px 0 40px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;list-style:none;border-top:1px solid var(--card-line);padding-top:24px}
.hero-stats strong{display:block;font-size:26px;font-weight:700;letter-spacing:-.5px}
.hero-stats span{font-size:13px;color:var(--txt-dim)}

/* Hero 视觉 */
.hero-visual{display:flex;justify-content:center;align-items:center;min-height:420px}
.orbit{position:relative;width:380px;height:380px;display:flex;align-items:center;justify-content:center}
.ring{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.07)}
.ring-a{inset:0;animation:spin 26s linear infinite}
.ring-b{inset:44px;border-color:rgba(255,122,92,.18);animation:spin 18s linear infinite reverse}
.ring-c{inset:92px;border-color:rgba(255,255,255,.05)}
.ring-a::after,.ring-b::after{
  content:"";position:absolute;top:-4px;left:50%;width:7px;height:7px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 14px 2px rgba(255,122,92,.7);
}
.rocket{
  width:150px;height:150px;border-radius:34px;position:relative;z-index:2;
  box-shadow:0 30px 70px -20px rgba(255,80,80,.55);
  animation:float 5.5s ease-in-out infinite;
}
.spark{position:absolute;width:5px;height:5px;border-radius:50%;background:rgba(255,180,150,.85)}
.s1{top:18%;left:12%;animation:twinkle 3s ease-in-out infinite}
.s2{bottom:22%;right:14%;animation:twinkle 3.6s ease-in-out .6s infinite}
.s3{top:62%;left:6%;animation:twinkle 4.2s ease-in-out 1.2s infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes float{0%,100%{transform:translateY(-8px)}50%{transform:translateY(8px)}}
@keyframes twinkle{0%,100%{opacity:.2}50%{opacity:1}}

/* 通用区块 */
.section{max-width:var(--maxw);margin:0 auto;padding:86px 24px}
.sec-head{text-align:center;max-width:640px;margin:0 auto 46px}
.sec-head h2{font-size:clamp(27px,3.4vw,38px);font-weight:750;letter-spacing:-.6px}
.sec-head p{color:var(--txt-dim);margin-top:12px;font-size:16px}

/* 下载 */
.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.dl-card{
  display:flex;flex-direction:column;gap:16px;
  padding:26px 24px 22px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--card-line);
  transition:transform .2s ease,border-color .2s,background .2s;
}
.dl-card:hover{transform:translateY(-4px);border-color:rgba(255,122,92,.4);background:rgba(255,122,92,.06)}
.dl-ico{width:42px;height:42px;color:var(--accent)}
.dl-txt{min-height:66px}
.dl-txt h3{font-size:17px;font-weight:650}
.dl-meta{color:var(--txt-dim);font-size:13px;margin-top:3px}
.dl-go{
  margin-top:auto;font-size:13px;color:var(--txt-dim);
  border-top:1px solid var(--card-line);padding-top:14px;
}
.dl-btn{
  margin-top:auto;display:block;text-align:center;
  padding:11px 16px;border-radius:12px;font-size:14px;font-weight:600;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;
  box-shadow:0 8px 22px -12px rgba(255,90,90,.9);
  transition:transform .18s ease,box-shadow .25s ease;
}
.dl-btn:hover{transform:translateY(-2px);box-shadow:0 14px 30px -12px rgba(255,90,90,.95)}
.dl-sub{
  display:block;text-align:center;margin-top:10px;
  font-size:12.5px;color:var(--txt-dim);text-decoration:underline;
  text-underline-offset:3px;text-decoration-color:rgba(255,255,255,.18);
  transition:color .2s;
}
.dl-sub:hover{color:var(--accent)}
.dl-note{
  margin-top:12px;font-size:12px;line-height:1.55;color:#7f8492;
  border-top:1px solid var(--card-line);padding-top:11px;
  min-height:58px;
}
.dl-card .dl-sub{min-height:58px;display:flex;align-items:center;justify-content:center;margin-top:12px}
.dl-tip{text-align:center;color:var(--txt-dim);font-size:14px;margin-top:26px}

/* 功能 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{
  padding:30px 28px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--card-line);
  transition:border-color .2s,transform .2s;
}
.feat:hover{border-color:rgba(255,255,255,.16);transform:translateY(-3px)}
.feat-ico{
  width:44px;height:44px;padding:10px;border-radius:13px;color:var(--accent);
  background:var(--accent-soft);margin-bottom:18px;
}
.feat h3{font-size:18px;font-weight:650;margin-bottom:9px}
.feat p{color:var(--txt-dim);font-size:15px}

/* 步骤 */
.band{background:var(--bg-soft);max-width:none;border-top:1px solid var(--card-line);border-bottom:1px solid var(--card-line)}
.band .sec-head,.band .steps{max-width:var(--maxw);margin-left:auto;margin-right:auto}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;list-style:none;counter-reset:s}
.steps li{padding:30px 28px;border-radius:var(--radius);background:var(--card);border:1px solid var(--card-line)}
.step-n{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:1px;
  color:var(--accent);margin-bottom:14px;
}
.steps h3{font-size:18px;font-weight:650;margin-bottom:8px}
.steps p{color:var(--txt-dim);font-size:15px}

/* FAQ */
.faq{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq details{
  background:var(--card);border:1px solid var(--card-line);border-radius:16px;
  padding:18px 22px;transition:border-color .2s;
}
.faq details[open]{border-color:rgba(255,122,92,.32)}
.faq summary{
  cursor:pointer;font-size:16px;font-weight:600;list-style:none;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";width:9px;height:9px;flex:none;
  border-right:2px solid var(--txt-dim);border-bottom:2px solid var(--txt-dim);
  transform:rotate(45deg);transition:transform .2s;
}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq p{color:var(--txt-dim);font-size:15px;margin-top:12px}

/* CTA */
.cta{padding:20px 24px 100px}
.cta-inner{
  max-width:var(--maxw);margin:0 auto;text-align:center;
  padding:64px 32px;border-radius:28px;
  background:
    radial-gradient(120% 140% at 50% 0%,rgba(255,122,92,.18),transparent 60%),
    var(--bg-soft);
  border:1px solid rgba(255,122,92,.22);
}
.cta-inner h2{font-size:clamp(26px,3.2vw,36px);font-weight:750;letter-spacing:-.5px}
.cta-inner p{color:var(--txt-dim);margin:12px 0 30px}

/* 页脚 */
.foot{border-top:1px solid var(--card-line);background:var(--bg-soft)}
.foot-top{
  max-width:var(--maxw);margin:0 auto;padding:52px 24px 40px;
  display:flex;justify-content:space-between;gap:48px;flex-wrap:wrap;
}
.foot-brand{display:flex;align-items:center;gap:13px}
.foot-brand img{width:44px;height:44px;border-radius:13px}
.foot-brand strong{display:block;font-size:16px}
.foot-brand span{font-size:13px;color:var(--txt-dim)}
.foot-links{display:flex;gap:70px}
.foot-links h4{font-size:14px;margin-bottom:14px;color:var(--txt)}
.foot-links a{display:block;font-size:14px;color:var(--txt-dim);margin-bottom:9px;transition:color .2s}
.foot-links a:hover{color:var(--accent)}
.foot-bot{
  max-width:var(--maxw);margin:0 auto;padding:20px 24px 34px;
  border-top:1px solid var(--card-line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--txt-dim);
}

/* 响应式 */
@media (max-width:980px){
  .hero{grid-template-columns:1fr;padding-top:40px;text-align:center}
  .lead{margin-inline:auto}
  .hero-actions,.hero-stats{justify-content:center}
  .hero-visual{order:-1;min-height:300px}
  .orbit{width:280px;height:280px}
  .rocket{width:118px;height:118px}
  .dl-grid,.feat-grid,.steps{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
}
@media (max-width:620px){
  .dl-grid,.feat-grid,.steps{grid-template-columns:1fr}
  .hero-stats{gap:28px}
  .section{padding:60px 20px}
  .foot-links{gap:44px}
}

/* Mac 安装教程弹窗 */
.modal{position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;padding:24px}
.modal[hidden]{display:none}
.modal-mask{position:absolute;inset:0;background:rgba(4,5,8,.72);backdrop-filter:blur(6px)}
.modal-box{
  position:relative;z-index:1;width:min(560px,100%);max-height:86vh;overflow-y:auto;
  background:linear-gradient(180deg,#14161f,#0d0f15);
  border:1px solid rgba(255,122,92,.24);border-radius:24px;
  padding:34px 32px 28px;
  box-shadow:0 40px 90px -30px rgba(0,0,0,.9);
  animation:mIn .2s ease-out;
}
@keyframes mIn{from{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:none}}
.modal-x{
  position:absolute;top:16px;right:16px;width:34px;height:34px;padding:8px;
  border-radius:10px;border:1px solid var(--card-line);background:var(--card);
  color:var(--txt-dim);cursor:pointer;transition:color .2s,border-color .2s;
}
.modal-x:hover{color:var(--txt);border-color:rgba(255,255,255,.22)}
.modal-box h3{font-size:22px;font-weight:750;letter-spacing:-.4px}
.modal-sub{color:var(--txt-dim);font-size:14px;margin-top:8px}
.modal-steps{list-style:none;margin:26px 0 0;display:flex;flex-direction:column;gap:20px}
.modal-steps li{display:flex;gap:14px}
.ms-n{
  flex:none;width:26px;height:26px;border-radius:9px;
  background:var(--accent-soft);color:var(--accent);
  font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;
  margin-top:2px;
}
.modal-steps h4{font-size:15.5px;font-weight:650;margin-bottom:5px}
.modal-steps p{color:var(--txt-dim);font-size:14px;line-height:1.6}
.modal-steps strong{color:var(--txt);font-weight:600}
.ms-alt{
  margin-top:8px;padding:9px 12px;border-radius:10px;
  background:rgba(255,255,255,.03);border:1px solid var(--card-line);
  font-size:13px;
}
.modal-dl{
  display:inline-flex;margin-top:12px;padding:10px 20px;border-radius:999px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;
  font-size:14px;font-weight:600;
  box-shadow:0 8px 22px -12px rgba(255,90,90,.9);
  transition:transform .18s ease;
}
.modal-dl:hover{transform:translateY(-2px)}
.modal-foot{
  margin-top:24px;padding-top:16px;border-top:1px solid var(--card-line);
  color:#7f8492;font-size:13px;
}
button.dl-btn{border:none;cursor:pointer;font-family:inherit;width:100%}
@media (max-width:620px){
  .modal{padding:14px}
  .modal-box{padding:28px 22px 22px}
}