*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Poppins,sans-serif;
}

body{
background:#0f172a;
color:#fff;
}

.container{
display:flex;
min-height:100vh;
}

/* Sidebar */

.sidebar{
width:250px;
background:#111827;
padding:25px;
}

.sidebar h2{
color:#facc15;
margin-bottom:40px;
}

.sidebar ul{
list-style:none;
}

.sidebar li{
margin-bottom:15px;
}

.sidebar a{
display:block;
padding:15px;
color:#fff;
text-decoration:none;
border-radius:10px;
transition:.3s;
}

.sidebar a:hover,
.sidebar .active a{
background:#2563eb;
}

.sidebar i{
margin-right:10px;
}

/* Main */

.main{
flex:1;
padding:40px;
}

.main h1{
font-size:36px;
margin-bottom:10px;
}

.subtitle{
color:#cbd5e1;
margin-bottom:40px;
}

/* Plans */

.plans{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
gap:30px;
}

.plan{
background:#1e293b;
padding:30px;
border-radius:20px;
text-align:center;
position:relative;
transition:.3s;
border:2px solid transparent;
}

.plan:hover{
transform:translateY(-8px);
border-color:#facc15;
}

.featured{
border:2px solid #facc15;
}

.badge{
position:absolute;
top:-12px;
right:20px;
background:#facc15;
color:#000;
padding:6px 12px;
border-radius:20px;
font-size:12px;
font-weight:bold;
}

.plan h2{
margin-bottom:15px;
color:#facc15;
}

.price{
font-size:28px;
font-weight:bold;
margin-bottom:20px;
}

.plan ul{
list-style:none;
margin-bottom:25px;
}

.plan ul li{
padding:10px 0;
border-bottom:1px solid rgba(255,255,255,.08);
}

button{
width:100%;
padding:15px;
border:none;
border-radius:10px;
background:#2563eb;
color:#fff;
font-size:16px;
font-weight:bold;
cursor:pointer;
transition:.3s;
}

button:hover{
background:#1d4ed8;
}

@media(max-width:900px){

.container{
flex-direction:column;
}

.sidebar{
width:100%;
}

.main{
padding:20px;
}

}

/* =========================================================
   MESSAGE BOX
   ========================================================= */

.message-box {
    display: none;

    padding: 14px 16px;

    margin-bottom: 20px;

    border-radius: 10px;

    font-size: 14px;

    font-weight: 600;
}

.message-box.success {
    display: block;

    background: #ecfdf3;

    color: #15803d;

    border: 1px solid #bbf7d0;
}

.message-box.error {
    display: block;

    background: #fef2f2;

    color: #b91c1c;

    border: 1px solid #fecaca;
}

.invest-btn:disabled {
    opacity: 0.6;

    cursor: not-allowed;
}