:root{
    --bg-dark: #08080a;
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --accent: #6366f1; /* Indigo accent */
    --accent-glow: rgba(99, 102, 241, 0.3);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
}

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

body{
    font-family:'Inter',-apple-system,sans-serif;
    background:var(--bg-dark);
    height:100vh;
    color:var(--text-main);
    display:flex;
    justify-content:center;
    align-items:center;
    overflow:hidden;
}

.shell{
    width:95vw;
    height:90vh;
    max-width:1200px;
    display:flex;
    background:var(--glass);
    backdrop-filter:blur(25px);
    -webkit-backdrop-filter:blur(25px);
    border:1px solid var(--glass-border);
    border-radius:28px;
    box-shadow:0 40px 80px -20px rgba(0,0,0,.6);
}

/* Sidebar */

aside{
    width:240px;
    background:rgba(0,0,0,.6);
    border-right:1px solid var(--glass-border);
    padding:20px 30px;
    display:flex;
    flex-direction:column;
    gap:10px;
}

/* Main layout */

main{
    flex:1;
    display:flex;
    flex-direction:column;
}

/* Header */

.header{
    padding:20px 30px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    border-bottom:1px solid var(--glass-border);
}

/* Chat Area */

#chatbox{
    flex:1;
    padding:40px;
    overflow-y:auto;
    scroll-behavior:smooth;
}

/* Messages */

.usr{
    margin-left:auto;
    background:var(--accent);
    padding:14px 20px;
    border-radius:18px 18px 4px 18px;
    font-weight:500;
    max-width:70%;
    margin-bottom:14px;
}

.bot{
    background:rgba(255,255,255,0.03);
    border:1px solid var(--glass-border);
    padding:20px;
    border-radius:4px 18px 18px 18px;
    max-width:70%;
    margin-bottom:14px;
}

/* Message input row */

.msg-bubble{
    display:flex;
    gap:10px;
    padding:20px;
    border-top:1px solid var(--glass-border);
}

.msg-bubble input{
    flex:1;
    padding:12px 14px;
    border-radius:10px;
    border:1px solid var(--glass-border);
    background:rgba(255,255,255,0.05);
    color:white;
    outline:none;
}

/* Button */

.btn-btn-img{
    background:var(--accent);
    border:none;
    color:white;
    padding:0 24px;
    border-radius:12px;
    cursor:pointer;
    font-weight:600;
    transition:.2s;
}

.btn-btn-img:hover{
    opacity:.85;
}

/* Icons */

.usr-img,
.bot-img{
    width:30px;
    height:30px;
    margin-right:6px;
    vertical-align:middle;
}