:root{
--bg:#0f172a;
--surface:#1e293b;
--text:#f8fafc;
--muted:#94a3b8;
--primary:#6366f1;
}
body{margin:0;font-family:Inter,system-ui;background:var(--bg);color:var(--text);}
.header{display:flex;justify-content:space-between;padding:20px 40px;background:var(--surface);}
.container{padding:40px;}
.card{background:var(--surface);padding:25px;border-radius:18px;margin-bottom:20px;}
button{padding:12px;border:none;border-radius:10px;background:var(--primary);color:white;cursor:pointer;}
input{padding:10px;width:100%;margin:8px 0;border-radius:8px;border:none;}