:root{
  --bg:#0f1216;
  --panel:#121a24;
  --panel2:#0e1620;
  --text:#e8edf4;
  --muted:#a7b2c3;
  --accent:#2f8fdc;
  --border:#223245;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:linear-gradient(180deg, #0e1116 0%, #0b0f14 100%);
}

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

.layout{
  display:grid;
  grid-template-columns: 320px 1fr;
  min-height:100vh;
}

.sidebar{
  background:linear-gradient(180deg, var(--panel) 0%, var(--panel2) 100%);
  border-right:1px solid var(--border);
  padding:14px 14px;
  position:sticky;
  top:0;
  height:100vh;
  overflow:auto;
}

.brand{
  display:block;
  margin-bottom:10px;
}
.brand .logo{
  width:100%;
  height:78px;
  border-radius:14px;
  background:rgba(47,143,220,.10);
  border:1px solid rgba(47,143,220,.22);
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
}
.brand .logo img{
  width:100%;
  height:100%;
  object-fit:contain;
  padding:8px 10px;
  background:transparent;
}
.brand .title{
  margin-top:10px;
  line-height:1.2;
}
.brand .title b{display:block; font-size:16px}
.brand .title small{color:var(--muted)}

.nav h4{
  margin:14px 8px 8px;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.08em;
  color:var(--muted);
}
.nav a{
  display:block;
  padding:10px 10px;
  border-radius:12px;
  margin:4px 2px;
  color:var(--text);
  border:1px solid transparent;
}
.nav a:hover{
  background:rgba(47,143,220,.08);
  border-color:rgba(47,143,220,.18);
  text-decoration:none;
}
.nav a.active{
  background:rgba(47,143,220,.12);
  border-color:rgba(47,143,220,.24);
}

.content{
  padding:28px 26px 60px;
  max-width: 1100px;
}

.card{
  background:rgba(21,26,33,.7);
  border:1px solid var(--border);
  border-radius:18px;
  padding:18px 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.hero{
  display:flex;
  justify-content:space-between;
  gap:18px;
  align-items:flex-start;
  flex-wrap:wrap;
}
.hero h1{margin:0 0 6px; font-size:28px}
.hero p{margin:0;color:var(--muted)}
.badge{
  border:1px solid rgba(47,143,220,.28);
  color:var(--accent);
  background:rgba(47,143,220,.10);
  border-radius:999px;
  padding:6px 10px;
  font-size:12px;
}

h2{margin:26px 0 10px; font-size:20px}
h3{margin:18px 0 8px; font-size:16px}
p{line-height:1.55}
ul,ol{line-height:1.55}
.muted{color:var(--muted)}
hr{border:none; border-top:1px solid var(--border); margin:18px 0}

.kv{
  display:grid;
  grid-template-columns: 240px 1fr;
  gap:10px 16px;
  margin:10px 0;
}
.kv div{padding:6px 0}
.kv .k{color:var(--muted)}

.note{
  border-left:3px solid rgba(47,143,220,.7);
  background:rgba(47,143,220,.08);
  padding:10px 12px;
  border-radius:10px;
  margin:12px 0;
}
.warn{
  border-left:3px solid rgba(255,193,7,.75);
  background:rgba(255,193,7,.08);
  padding:10px 12px;
  border-radius:10px;
  margin:12px 0;
}
img.screen{
  max-width:100%;
  width:auto;
  height:auto;
  display:block;
  margin:12px auto;
  border-radius:14px;
  border:1px solid var(--border);
  background:#0b0f14;
}
.footer-nav{
  display:flex;
  justify-content:space-between;
  gap:12px;
  margin-top:22px;
}
.footer-nav a{
  display:inline-block;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:rgba(21,26,33,.6);
}

@media (max-width: 900px){
  .layout{grid-template-columns: 1fr}
  .sidebar{position:relative; height:auto}
}