:root{
  --primary:#4332BD;
  --accent:#E96742;
  --bg:#EBEAED;
  --text:#1f2430;
}
*{box-sizing:border-box}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:IRANSans, Tahoma, sans-serif;font-size:18px;line-height:1.9;
}
h1,h2,h3{margin:0 0 12px;font-size:20px}
.container{width:min(100%,1100px);margin-inline:auto;padding:16px}
.row{display:flex}.between{justify-content:space-between}.center{align-items:center}
.topbar{background:#fff;border-bottom:1px solid #ddd;position:sticky;top:0;z-index:50}
.brand p{margin:0;color:#555;font-size:16px}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:10px 16px;border-radius:12px;
  text-decoration:none;border:2px solid transparent;cursor:pointer;font-weight:700
}
.btn-primary{background:var(--accent);color:#fff}
.btn-outline{border-color:var(--primary);color:var(--primary);background:#fff}
.hero,.card{background:#fff;border-radius:16px;margin-top:16px;padding:18px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
label{display:flex;flex-direction:column;gap:8px;font-weight:600}
input,select,button{
  font:inherit;padding:10px;border:1px solid #ccc;border-radius:10px;background:#fff
}
input[type="range"]{padding:0}
.result-box{background:#f8f8fb;padding:14px;border-radius:12px;border:1px solid #ececf4}
.result-box span{display:block;color:#666;font-size:14px}
.result-box b{color:var(--primary);font-size:18px}
.note{color:#666}
.form-msg{margin-top:10px;font-weight:700}
.footer{color:#666;padding-bottom:28px}

@media (max-width:768px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .actions{width:100%}
  .actions .btn{flex:1;text-align:center}
  .container{padding:14px}
}