```css
*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
font-family:'Inter',sans-serif;
background:#050816;
color:#fff;
display:flex;
min-height:100vh;
}

.sidebar{
width:260px;
background:#0a1022;
padding:30px;
border-right:1px solid rgba(255,255,255,.08);
position:fixed;
height:100%;
}

.brand{
font-size:30px;
font-weight:800;
color:#ffc107;
margin-bottom:50px;
}

.brand span{
display:block;
font-size:14px;
color:white;
letter-spacing:4px;
}

.sidebar ul{
list-style:none;
}

.sidebar li{
padding:15px;
margin-bottom:10px;
background:#11192f;
border-radius:12px;
cursor:pointer;
transition:.3s;
}

.sidebar li:hover{
background:#ffc107;
color:#000;
}

.main{
margin-left:260px;
width:calc(100% - 260px);
padding:40px;
}

header{
display:flex;
justify-content:space-between;
align-items:center;
margin-bottom:30px;
}

header h1{
font-size:40px;
font-weight:800;
}

header p{
opacity:.7;
margin-top:8px;
}

.user-box{
background:#11192f;
padding:12px 20px;
border-radius:12px;
color:#ffc107;
font-weight:700;
}

.top-cards{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:20px;
margin-bottom:30px;
}

.card{
background:linear-gradient(145deg,#11192f,#0a1022);
padding:25px;
border-radius:20px;
border:1px solid rgba(255,255,255,.05);
box-shadow:0 10px 30px rgba(0,0,0,.3);
}

.card h3{
opacity:.7;
margin-bottom:10px;
}

.card h2{
font-size:32px;
color:#31ff7a;
}

.chart-wrapper{
background:#11192f;
padding:25px;
border-radius:20px;
margin-bottom:30px;
}

.chart-wrapper h2{
margin-bottom:20px;
}

#tradingview_chart{
height:550px;
}

.market-grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
gap:20px;
margin-bottom:30px;
}

.market-box{
background:#11192f;
padding:25px;
border-radius:20px;
}

.market-box h3{
margin-bottom:15px;
color:#ffc107;
}

.market-box p{
padding:8px 0;
}

.news{
margin-bottom:30px;
}

.news h2{
margin-bottom:20px;
}

.news-grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
gap:20px;
}

.news-card{
background:#11192f;
padding:25px;
border-radius:20px;
line-height:1.7;
}

@media(max-width:900px){

.sidebar{
display:none;
}

.main{
margin-left:0;
width:100%;
padding:20px;
}

header{
flex-direction:column;
align-items:flex-start;
gap:20px;
}

header h1{
font-size:30px;
}

}
```