/* 星空夜话 主站样式（零构建，单文件；token 与 App 同一套，见 design/主站设计说明.md §1） */
:root{
  --bg:#0D1117; --surface:#161B22; --surface-2:#1F2630;
  --fg:#E6EDF3; --muted:#8B949E;
  --primary:#B39DDB; --secondary:#81D4FA; --tertiary:#FFAB91;
  --hairline:rgba(230,237,243,.08);
  --wrap:1120px; --radius-card:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font:15px/26px -apple-system,"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans CJK SC",sans-serif;
  -webkit-font-smoothing:antialiased;
}
body::before{ /* 顶部月光光晕 */
  content:""; position:fixed; inset:0; pointer-events:none; z-index:-2;
  background:radial-gradient(circle at 50% -10%, rgba(179,157,219,.18), transparent 55%);
}
body::after{ /* 星尘（静态平铺） */
  content:""; position:fixed; inset:0; pointer-events:none; z-index:-1; opacity:.6;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cg fill='%23E6EDF3' fill-opacity='.18'%3E%3Ccircle cx='12' cy='34' r='1'/%3E%3Ccircle cx='88' cy='18' r='1.2'/%3E%3Ccircle cx='150' cy='70' r='.9'/%3E%3Ccircle cx='60' cy='130' r='1.1'/%3E%3Ccircle cx='205' cy='150' r='1'/%3E%3Ccircle cx='28' cy='196' r='.8'/%3E%3Ccircle cx='176' cy='215' r='1.1'/%3E%3C/g%3E%3C/svg%3E");
}
a{color:var(--fg); text-decoration:none}
a:hover{color:var(--primary)}
a:focus-visible,.btn:focus-visible{outline:2px solid var(--primary); outline-offset:2px; border-radius:6px}
.wrap{max-width:var(--wrap); margin:0 auto; padding:0 20px}
.muted{color:var(--muted)}
.skip{position:absolute; left:-9999px}
.skip:focus{left:16px; top:12px; z-index:99; background:var(--primary); color:var(--bg); padding:8px 14px; border-radius:8px}

/* 导航 */
.nav{position:sticky; top:0; z-index:10; background:rgba(13,17,23,.86); backdrop-filter:blur(8px); border-bottom:1px solid var(--hairline)}
.nav-inner{display:flex; align-items:center; gap:24px; height:64px}
.brand{display:flex; align-items:center; gap:10px; font-weight:500; font-size:17px}
.nav-links{display:flex; gap:22px; margin-left:8px; overflow-x:auto; white-space:nowrap}
.nav-links a{color:var(--muted); font-size:14px; transition:color 120ms ease-out}
.nav-links a:hover{color:var(--primary)}
.nav .btn{margin-left:auto}

/* 按钮 */
.btn{display:inline-block; background:var(--primary); color:#0D1117; font-weight:500; border-radius:999px;
     padding:12px 24px; transition:transform 120ms ease-out, filter 120ms ease-out}
.btn:hover{color:#0D1117; transform:translateY(-2px); filter:brightness(1.06)}
.btn-sm{padding:8px 16px; font-size:14px}
.btn-lg{padding:16px 32px; font-size:17px}
.btn.is-disabled{background:var(--surface-2); color:var(--muted); pointer-events:none}
.link{color:var(--secondary); font-size:15px}

/* Hero */
.hero{padding:88px 0 96px}
.hero-inner{display:grid; grid-template-columns:56% 44%; gap:40px; align-items:center}
.eyebrow{color:var(--tertiary); font-size:13px; font-weight:500; margin:0 0 12px}
h1{font-size:56px; line-height:64px; font-weight:500; margin:0 0 8px}
.tagline{font-size:20px; line-height:32px; color:var(--fg); margin:0 0 20px}
.lead{font-size:16px; line-height:28px; color:var(--muted); margin:0 0 28px; max-width:560px}
.cta-row{display:flex; align-items:center; gap:24px; margin-bottom:18px; flex-wrap:wrap}
.fineprint{font-size:13px; line-height:20px; color:var(--muted); margin:0}
.hero-art{justify-self:center}

/* 手机占位/手机框 */
.phone{width:300px; aspect-ratio:9/19.5; border-radius:28px; border:1px solid var(--hairline);
       background:linear-gradient(180deg,#161B22,#0D1117); overflow:hidden}
.phone svg{display:block; width:100%; height:100%}

/* 区块 */
.section{padding:72px 0}
h2{font-size:32px; line-height:44px; font-weight:500; margin:0 0 8px}
h3{font-size:18px; line-height:28px; font-weight:500; margin:14px 0 8px}
.section-lead{color:var(--muted); margin:0 0 32px}
.card{background:var(--surface); border:1px solid var(--hairline); border-radius:var(--radius-card); padding:24px;
      transition:border-color 160ms ease-out}
.card:hover{border-color:rgba(179,157,219,.35)}
.cards{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
.ico{width:24px; height:24px}
.card p{color:var(--muted); margin:0}

/* 界面预览 */
.shots{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
.shot{margin:0; text-align:center}
.shot .phone{width:100%; max-width:260px; margin:0 auto}
.shot figcaption{color:var(--muted); font-size:13px; margin-top:12px}
.shot img{width:100%; max-width:260px; border-radius:28px; border:1px solid var(--hairline); display:block; margin:0 auto}

/* 内容安全 */
.safety{display:grid; grid-template-columns:1fr 1.4fr; gap:32px}
.safety-list{margin:0; padding-left:18px; color:var(--muted)}
.safety-list li{margin-bottom:10px}

/* FAQ */
details{background:var(--surface); border:1px solid var(--hairline); border-radius:12px; padding:16px 20px; margin-bottom:10px}
details[open]{border-color:rgba(179,157,219,.35)}
summary{cursor:pointer; font-size:16px; font-weight:500}
details p{color:var(--muted); margin:12px 0 0}

/* 下载 */
.dl{display:grid; grid-template-columns:1fr auto; gap:24px; align-items:center; padding:32px}
.dl-meta{color:var(--fg); margin:8px 0}
.dl-notes{color:var(--muted); margin:0 0 12px}
.dl code{background:var(--surface-2); border-radius:6px; padding:2px 6px; font-size:12px; word-break:break-all}

/* 页脚 */
footer{border-top:1px solid var(--hairline); padding:48px 0 32px; margin-top:48px}
.footer-inner{display:grid; grid-template-columns:1.2fr 1fr 1fr; gap:24px}
.footer-inner p{margin:8px 0 0; font-size:13px}
.footer-links{display:flex; flex-direction:column; gap:8px; font-size:14px}
.footer-links a,.footer-meta a{color:var(--muted)}
.footer-legal{color:var(--muted); font-size:12px; margin-top:32px}

/* 手机 */
@media (max-width:900px){
  .hero{padding:48px 0 56px}
  .hero-inner{grid-template-columns:1fr; gap:32px}
  .hero-art{order:2}
  .phone{width:240px}
  h1{font-size:30px; line-height:40px}
  .tagline{font-size:17px; line-height:28px}
  h2{font-size:26px; line-height:36px}
  .section{padding:56px 0}
  .cards,.shots,.safety,.dl,.footer-inner{grid-template-columns:1fr}
  .nav-inner{height:56px; gap:14px}
  .dl{padding:24px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important; animation:none!important}
  html{scroll-behavior:auto}
}