:root{
  --bg:#0a0c0f; --panel:#12151b; --panel2:#161a21; --line:#232833;
  --txt:#e9e6e0; --mut:#9d978c; --dim:#6f6a60;
  --bronze:#d2a24c; --bronze2:#b8892f;
  --radius:18px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  -webkit-font-smoothing:antialiased; line-height:1.7; overflow-x:hidden;
}
a{color:inherit}
::selection{background:var(--bronze);color:#111}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(10,12,15,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1120px;margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-size:17px;letter-spacing:.02em}
.logo svg{width:26px;height:26px;fill:none;stroke:var(--bronze);stroke-width:1.6;stroke-linejoin:round}
.logo b{font-weight:700}
.gh{display:flex;align-items:center;gap:8px;padding:8px 16px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:14px;color:var(--txt);transition:border-color .25s,background .25s}
.gh:hover{border-color:var(--bronze);background:rgba(210,162,76,.08)}
.gh svg{width:18px;height:18px;fill:currentColor}

/* hero */
.hero{max-width:1120px;margin:0 auto;padding:88px 24px 0;text-align:center}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.28em;color:var(--bronze);border:1px solid rgba(210,162,76,.35);border-radius:999px;padding:6px 18px;margin-bottom:28px}
.hero h1{font-size:clamp(2.6rem,7vw,4.6rem);line-height:1.18;font-weight:800;letter-spacing:.01em}
.hero .sub{margin:26px auto 0;max-width:640px;font-size:clamp(1rem,2.2vw,1.2rem);color:var(--mut)}
.install-box{margin:34px auto 0;max-width:820px;display:flex;align-items:center;gap:12px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 14px 14px 20px;text-align:left;box-shadow:0 24px 60px rgba(0,0,0,.45)}
.install-box code{flex:1;min-width:0;overflow-x:auto;white-space:nowrap;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px;color:#e8d9b0;scrollbar-width:none}
.install-box code::-webkit-scrollbar{display:none}
.copy{flex:0 0 auto;appearance:none;border:1px solid var(--bronze);background:transparent;color:var(--bronze);border-radius:10px;padding:10px 20px;font-size:14px;cursor:pointer;transition:background .25s,color .25s}
.copy:hover{background:var(--bronze);color:#111}
.copy.done{background:var(--bronze);color:#111}
.hero-img{margin:56px auto 0;max-width:1120px;border-radius:22px;overflow:hidden;border:1px solid var(--line);box-shadow:0 40px 90px rgba(0,0,0,.55)}
.hero-img img{display:block;width:100%;height:auto;aspect-ratio:16/8;object-fit:cover}

/* features */
.features{max-width:1120px;margin:0 auto;padding:110px 24px 0}
.features h2,.install h2{font-size:clamp(1.7rem,4vw,2.3rem);font-weight:800;letter-spacing:.02em;margin-bottom:40px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease}
.card:hover{transform:translateY(-5px);border-color:rgba(210,162,76,.55);box-shadow:0 18px 44px rgba(0,0,0,.4)}
.ic{width:44px;height:44px;border-radius:12px;background:rgba(210,162,76,.1);border:1px solid rgba(210,162,76,.3);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.ic svg{width:24px;height:24px;fill:none;stroke:var(--bronze);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:16.5px;font-weight:700;margin-bottom:6px}
.card p{font-size:14px;color:var(--mut);line-height:1.65}

/* band */
.band{max-width:1120px;margin:110px auto 0;padding:0 24px;position:relative}
.band img{display:block;width:100%;height:auto;aspect-ratio:16/7;object-fit:cover;border-radius:22px;border:1px solid var(--line)}
.band-text{position:absolute;left:0;right:0;bottom:0;padding:44px;text-align:center;text-shadow:0 2px 18px rgba(0,0,0,.8)}
.band-text h2{font-size:clamp(1.5rem,3.6vw,2.2rem);font-weight:800}
.band-text p{color:#d8d2c6;margin-top:8px;font-size:15px}

/* install */
.install{max-width:1120px;margin:0 auto;padding:110px 24px 0;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.install .install-box{margin:0;max-width:none}
.req{color:var(--mut);margin-bottom:22px}
.note{color:var(--mut);font-size:14px;margin-top:16px}
.alt{margin-top:28px;border-top:1px solid var(--line);padding-top:22px}
.alt p{font-size:14.5px;color:var(--mut);margin:10px 0}
.alt p b{color:var(--txt)}
.alt code{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;color:#e8d9b0;overflow-x:auto;white-space:nowrap;scrollbar-width:none}
.alt code::-webkit-scrollbar{display:none}
.alt a{color:var(--bronze)}
.install-img{border-radius:22px;overflow:hidden;border:1px solid var(--line)}
.install-img img{display:block;width:100%;height:auto;aspect-ratio:4/3.4;object-fit:cover}

/* footer */
footer{margin-top:110px;border-top:1px solid var(--line)}
.foot-inner{max-width:1120px;margin:0 auto;padding:30px 24px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;color:var(--dim);font-size:14px}
.foot-brand{color:var(--mut)}
.foot-brand b{color:var(--txt)}
.foot-ver{border:1px solid var(--line);border-radius:999px;padding:2px 12px}
.foot-links{margin-left:auto;display:flex;gap:22px}
.foot-links a{text-decoration:none;color:var(--mut)}
.foot-links a:hover{color:var(--bronze)}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* responsive */
@media (max-width:960px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .install{grid-template-columns:1fr;gap:32px}
  .install-img img{aspect-ratio:16/9}
  .band img{aspect-ratio:16/9}
  .hero{padding-top:64px}
  .features,.install{padding-top:84px}
  .band{margin-top:84px}
  footer{margin-top:84px}
}
@media (max-width:560px){
  .nav-inner{padding:12px 16px}
  .logo{font-size:15px}
  .gh span{display:none}
  .gh{padding:8px 12px}
  .hero{padding:52px 16px 0}
  .hero h1{font-size:2.5rem}
  .grid{grid-template-columns:1fr}
  .install-box{flex-direction:column;align-items:stretch;padding:14px}
  .install-box code{white-space:nowrap}
  .copy{width:100%}
  .hero-img img{aspect-ratio:16/10}
  .band-text{padding:24px 16px}
  .features,.install{padding-left:16px;padding-right:16px}
  .band{padding-left:16px;padding-right:16px}
  .foot-links{margin-left:0}
}