* { box-sizing: border-box; }
body { font-family: Arial, Helvetica, sans-serif; background: #f5f6f8; margin: 0; color: #222; }
header { background: #1a2b3c; color: #fff; padding: 14px 24px; display: flex; justify-content: space-between; align-items: center; }
header a { color: #fff; text-decoration: none; margin-left: 16px; }
main { max-width: 1000px; margin: 24px auto; padding: 0 16px; }
h1 { font-size: 22px; }
.card { background: #fff; border-radius: 8px; padding: 16px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid #eee; font-size: 14px; }
input, select, button, textarea { font-size: 14px; padding: 8px; margin: 4px 0; }
input[type=text], input[type=email], input[type=password], input[type=number], select, textarea { width: 100%; border: 1px solid #ccc; border-radius: 4px; }
button, .btn { background: #1a2b3c; color: #fff; border: none; border-radius: 4px; padding: 10px 16px; cursor: pointer; }
button:hover, .btn:hover { background: #33475b; }
.qty-input { width: 60px; }
.error { color: #b00020; }
.muted { color: #666; font-size: 13px; }
.flex { display: flex; gap: 12px; flex-wrap: wrap; }
.flex > div { flex: 1; min-width: 200px; }