:root{
  --bg:#0b0f17;
  --card:#121a2a;
  --muted:#94a3b8;
  --text:#e5e7eb;
  --line:#24324d;
  --accent:#22c55e;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;
  background:linear-gradient(180deg,#0b0f17,#080b12);
  color:var(--text);
}

.wrap{
  max-width:960px;
  margin:40px auto;
  padding:0 16px;
}

h1{margin:0 0 8px 0; font-size:28px}
.muted{color:var(--muted)}
.small{font-size:12px}

.card{
  margin-top:16px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  padding:18px;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
}

.lbl{display:block; margin-bottom:8px; font-weight:600}
.select{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#0e1524;
  color:var(--text);
}

.base-info{
  margin-top:12px;
  padding:10px 12px;
  border-radius:12px;
  border:1px dashed var(--line);
  color:#ff0000;
}

.items{margin-top:18px}
.items-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.group{
  margin-top:14px;
  border:1px solid var(--line);
  border-radius:14px;
  overflow:hidden;
}
.group-title{
  padding:10px 12px;
  background:#0e1524;
  border-bottom:1px solid var(--line);
  font-weight:700;
  color:#dbeafe;
}

.item{
  display:flex;
  gap:12px;
  padding:12px;
  border-bottom:1px solid var(--line);
  cursor:pointer;
}
.item:last-child{border-bottom:none}
.item input{margin-top:4px; transform:scale(1.1)}
.item-body{flex:1}
.item-name{font-weight:650}
.item-desc{color:var(--muted); font-size:13px; margin-top:2px}
.item-price{margin-top:6px; font-size:13px; color:#cbd5e1}

.result{
  margin-top:18px;
  border-top:1px solid var(--line);
  padding-top:16px;
  display:flex;
  justify-content:space-between;
  gap:16px;
}
.result-title{color:var(--muted); font-weight:650}
.result-price{
  margin-top:6px;
  font-size:26px;
  font-weight:800;
  color:var(--accent);
  letter-spacing:.2px;
}

.btn{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#0e1524;
  color:var(--text);
  cursor:pointer;
}
.btn:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent}

.result-actions{display:flex; align-items:flex-end}
.btn-accent{
  background:rgba(34,197,94,.12);
  border-color:rgba(34,197,94,.45);
  color:#86efac;
}
.btn:disabled{opacity:.45; cursor:not-allowed}

.input{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#0e1524;
  color:var(--text);
}

.grid{
  margin-top:10px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}
@media(max-width:720px){
  .grid{grid-template-columns:1fr}
}

.modal{position:fixed; inset:0; z-index:999}
.modal-backdrop{
  position:absolute; inset:0;
  background:rgba(0,0,0,.55);
}
.modal-card{
  position:relative;
  width:min(720px, calc(100% - 24px));
  margin:40px auto;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:0 25px 70px rgba(0,0,0,.45);
  padding:16px;
}
.modal-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  border-bottom:1px solid var(--line);
  padding-bottom:10px;
}
.modal-foot{
  margin-top:14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  border-top:1px solid var(--line);
  padding-top:12px;
}

.hidden{display:none}

.home-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 100px;
    height: 100px;
    background-color: #fff;
    color: #000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}