:root{
  --bg:#0b1220;
  --card:#0f1a2e;
  --muted:#97a3b6;
  --text:#e8eefc;
  --border:rgba(255,255,255,.10);
  --chip:rgba(255,255,255,.08);
  --link:#9bbcff;
  --shadow:0 20px 70px rgba(0,0,0,.45);
  --radius:18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(155,188,255,.22), transparent 60%),
    radial-gradient(900px 600px at 90% 0%, rgba(196,120,255,.16), transparent 55%),
    var(--bg);
  line-height:1.6;
}

a{color:var(--link); text-decoration:none}
a:hover{text-decoration:underline}

.container{
  max-width:1100px;
  margin:0 auto;
  padding:22px 16px 56px;
}

.topbar{
  display:flex;
  gap:16px;
  align-items:center;
  justify-content:space-between;
  padding:14px 16px;
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  border-radius:var(--radius);
  backdrop-filter: blur(10px);
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:240px;
}

.logo{
  width:34px;
  height:34px;
  border-radius:12px;
  background:linear-gradient(135deg, rgba(155,188,255,.9), rgba(196,120,255,.8));
  box-shadow:0 10px 30px rgba(155,188,255,.18);
  flex:0 0 auto;
}

.brand h1{
  margin:0;
  font-size:15px;
  letter-spacing:.2px;
}

.brand .sub{
  display:inline-block;
  margin-left:6px;
  color:var(--muted);
  font-weight:600;
  font-size:12px;
}

.nav{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  justify-content:center;
}

.nav a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:var(--text);
  font-weight:650;
  font-size:13px;
  text-align:center;
}

.nav a.active{
  background:rgba(155,188,255,.14);
  border-color:rgba(155,188,255,.35);
}

.lang{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.lang .hint{
  color:var(--muted);
  font-size:12px;
  font-weight:650;
}

.lang button{
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:var(--text);
  border-radius:999px;
  padding:8px 10px;
  font-weight:750;
  font-size:12px;
  cursor:pointer;
}

.lang button.active{
  background:rgba(196,120,255,.16);
  border-color:rgba(196,120,255,.35);
}

.hero{
  margin-top:14px;
  padding:18px 18px 16px;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  box-shadow:var(--shadow);
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:7px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  background:rgba(255,255,255,.03);
  color:var(--muted);
  font-weight:700;
  font-size:12px;
}

.badge i{
  width:10px;
  height:10px;
  border-radius:999px;
  background:rgba(155,188,255,.9);
  box-shadow:0 0 0 6px rgba(155,188,255,.10);
}

.hero h2{
  margin:12px 0 6px;
  font-size:28px;
  letter-spacing:.2px;
}

.hero p{
  margin:0;
  color:var(--muted);
  max-width:850px;
}

.grid{
  display:grid;
  grid-template-columns:1.6fr .9fr;
  gap:14px;
  margin-top:14px;
}

.card{
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:rgba(15,26,46,.75);
  box-shadow:var(--shadow);
  padding:18px;
}

.card h3{
  margin:0 0 10px;
  font-size:16px;
}

.card p{
  margin:10px 0;
}

.card ul,
.card ol{
  margin:10px 0 12px 18px;
}

.card li{
  margin:6px 0;
  color:rgba(232,238,252,.92);
}

.small{
  color:var(--muted);
  font-size:13px;
}

.sep{
  border:0;
  height:1px;
  background:var(--border);
  margin:16px 0;
}

.kv{
  display:grid;
  grid-template-columns:140px 1fr;
  gap:10px 14px;
  padding:12px;
  border-radius:14px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
}

.inline.code{
  font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  padding:2px 8px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  font-size:12px;
}

.footer{
  margin-top:12px;
  color:var(--muted);
  font-size:12.5px;
}

@media (max-width: 900px){
  .grid{
    grid-template-columns:1fr;
  }

  .brand{
    min-width:auto;
  }
}

@media (max-width: 700px){
  .container{
    padding:16px 10px 44px;
  }

  .topbar{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:16px;
    padding:18px 14px;
  }

  .brand{
    justify-content:center;
    text-align:center;
    gap:12px;
    min-width:0;
  }

  .logo{
    width:52px;
    height:52px;
    border-radius:16px;
  }

  .brand h1{
    font-size:21px;
    line-height:1.18;
  }

  .brand .sub{
    display:block;
    margin:6px 0 0;
    font-size:14px;
    line-height:1.25;
  }

  .nav{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:10px;
    width:100%;
  }

  .nav a{
    min-height:46px;
    padding:10px 12px;
    white-space:normal;
    line-height:1.2;
    font-size:14px;
  }

  .lang{
    justify-content:center;
    width:100%;
    gap:10px;
    flex-wrap:wrap;
  }

  .lang .hint{
    font-size:13px;
  }

  .lang button{
    min-width:54px;
    min-height:42px;
    padding:9px 14px;
    font-size:13px;
  }

  .hero{
    padding:18px 16px;
  }

  .hero h2{
    font-size:32px;
    line-height:1.12;
  }

  .card{
    padding:16px;
  }
}

@media (max-width: 520px){
  .kv{
    grid-template-columns:1fr;
  }
}

@media (max-width: 380px){
  .nav{
    grid-template-columns:1fr;
  }

  .brand h1{
    font-size:19px;
  }

  .hero h2{
    font-size:28px;
  }
}