:root{
  --bg:#f5f7fb;
  --surface:#ffffff;
  --accent:#3b82f6;
  --accent-dark:#1e40af;
  --success:#16a34a;
  --danger:#dc2626;
  --muted:#6b7280;
  --text:#111827;
  --shadow:0 8px 24px rgba(0,0,0,0.08);
  --radius:12px;
  --gap:1rem;
  --card-padding:1rem;
  --transition:200ms ease;
}

*{box-sizing:border-box;}
html,body{height:100%;margin:0;font-family:'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;}

header{
  width:100%;
  background:linear-gradient(90deg,var(--accent),var(--accent-dark));
  padding:.8rem 1rem;
  display:flex;
  justify-content:flex-end;
  align-items:center;
  gap:.5rem;
  box-shadow:var(--shadow);
  position:sticky;
  top:0;
  z-index:10;
}

header button{
  background:rgba(255,255,255,0.15);
  color:#fff;
  border:none;
  padding:.5rem .9rem;
  border-radius:9px;
  font-weight:700;
  cursor:pointer;
  transition:transform var(--transition),box-shadow var(--transition);
}

header button:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.15);}
header button:disabled{opacity:.5;cursor:not-allowed;}

main{max-width:1100px;margin:2rem auto;padding:0 1rem 3rem;}

h1{font-size:1.8rem;margin-bottom:1rem;color:var(--accent-dark);}
h2{font-size:1.2rem;margin:.5rem 0;}

.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--gap);}

.product-card{
  background:var(--surface);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:var(--card-padding);
  display:flex;
  gap:1rem;
  transition:transform var(--transition),box-shadow var(--transition);
}

.product-card:hover{
  transform:translateY(-6px);
  box-shadow:0 12px 28px rgba(0,0,0,0.12);
}

.product-card img{
  width:150px;
  height:110px;
  object-fit:cover;
  border-radius:8px;
  border:1px solid rgba(0,0,0,0.06);
}

.product-card>div{flex:1;}
.product-card p{margin:.3rem 0;color:var(--muted);}
.product-card span{color:#facc15;font-weight:700;margin-left:.3rem;}

.addtocart{
  background:var(--accent);
  color:#fff;
  padding:.5rem .8rem;
  border-radius:9px;
  border:none;
  cursor:pointer;
  font-weight:700;
  transition:transform var(--transition),box-shadow var(--transition);
}

.addtocart:hover{box-shadow:0 8px 24px rgba(59,130,246,0.2);}
.addtocart:active{transform:scale(.97);}
.product-card button[disabled]{opacity:.5;cursor:not-allowed;}


.sort-bar{
  display:flex;
  flex-wrap:wrap;
  gap:.75rem;
  margin-bottom:1.5rem;
}

.sort-bar select{
  padding:.5rem .8rem;
  border-radius:var(--radius);
  border:1px solid rgba(15,23,42,0.12);
  font-weight:600;
  cursor:pointer;
  transition:all var(--transition);
  background-color:var(--surface);
  color:var(--text);
}

.sort-bar select:hover{
  border-color:var(--accent);
  box-shadow:0 4px 12px rgba(59,130,246,0.15);
}

.sort-bar select:focus{
  outline:3px solid rgba(59,130,246,0.3);
  outline-offset:2px;
}

ul{list-style:none;padding:0;margin:0;}
li{
  display:flex;
  gap:1rem;
  align-items:center;
  padding:.6rem 0;
  border-bottom:1px solid rgba(0,0,0,0.05);
}

li img{
  width:64px;
  height:48px;
  border-radius:6px;
  object-fit:cover;
}

li button{
  background:transparent;
  border:1px solid rgba(220,38,38,0.2);
  color:var(--danger);
  padding:.35rem .6rem;
  border-radius:6px;
  cursor:pointer;
}

input[type='text'],input[type='number'],select,input[type='email']{
  padding:.45rem .6rem;
  border-radius:8px;
  border:1px solid rgba(15,23,42,0.12);
  width:100%;
  max-width:420px;
  margin-top:.4rem;
}

label{font-weight:600;color:var(--muted);display:inline-block;margin-top:.2rem;}

button:focus,input:focus,select:focus{outline:3px solid rgba(59,130,246,0.3);outline-offset:2px;}

@media(max-width:720px){
  .product-card{flex-direction:row;gap:.75rem;}
  .product-card img{width:120px;height:84px;}
}

@media(max-width:480px){
  main{margin:1rem auto;padding:0 .75rem;}
  .product-card{flex-direction:column;align-items:flex-start;}
  .product-card img{width:100%;height:160px;}
  header{padding:.5rem;}
  header button{min-width:unset;padding:.4rem .6rem;}
}