* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #f4f6f8;
  color: #1f2937;
  line-height: 1.5;
  padding-bottom: 40px;
}

header {
  background: linear-gradient(135deg, #2563eb, #1e40af);
  color: #fff;
  padding: 24px 20px;
  text-align: center;
}
header h1 { font-size: 24px; }
header .sub { opacity: .85; font-size: 13px; margin-top: 4px; }

main {
  max-width: 760px;
  margin: 20px auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.card h2 { font-size: 17px; margin-bottom: 14px; }

form { display: flex; flex-direction: column; gap: 12px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: #4b5563; }
.grow { flex: 1; min-width: 160px; }

input, select {
  padding: 8px 10px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
}
input:focus, select:focus { outline: 2px solid #93c5fd; border-color: #93c5fd; }

button {
  align-self: flex-start;
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 9px 22px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}
button:hover { background: #1d4ed8; }
button:disabled { opacity: .6; cursor: not-allowed; }

.msg { font-size: 13px; margin-left: 10px; }
.msg.ok { color: #16a34a; }
.msg.err { color: #dc2626; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid #eef0f2; }
th { color: #6b7280; font-weight: 600; font-size: 12px; }

.tag { padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.tag.in  { background: #dcfce7; color: #15803d; }
.tag.out { background: #fee2e2; color: #b91c1c; }
.stock-neg { color: #dc2626; font-weight: 600; }

.empty { color: #9ca3af; font-size: 13px; padding: 8px 0; }