:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #8a8f99;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --ok: #16a34a;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
.nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav .brand { font-weight: 700; font-size: 18px; }
.nav .spacer { flex: 1; }
.nav a { color: var(--text); font-size: 14px; }
.nav a:hover { color: var(--primary); }
.container { max-width: 960px; margin: 0 auto; padding: 24px 20px; }
.container.narrow { max-width: 420px; }
h1 { font-size: 22px; margin: 0 0 20px; }
h2 { font-size: 17px; margin: 24px 0 12px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
input, textarea, select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
}
textarea { resize: vertical; min-height: 60px; }
button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}
button:hover { background: var(--primary-dark); }
button.secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
button.secondary:hover { background: #f3f4f6; }
button.danger { background: var(--danger); }
button.small { padding: 5px 12px; font-size: 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.product-card { cursor: pointer; transition: box-shadow .15s; }
.product-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.product-card .name { font-weight: 600; font-size: 16px; }
.product-card .intro { color: var(--muted); font-size: 13px; margin: 6px 0; }
.price { color: var(--danger); font-weight: 600; }
.muted { color: var(--muted); font-size: 13px; }
.msg { padding: 10px 12px; border-radius: 8px; font-size: 14px; margin: 12px 0; display: none; }
.msg.show { display: block; }
.msg.error { background: #fef2f2; color: var(--danger); }
.msg.ok { background: #f0fdf4; color: var(--ok); }
table { width: 100%; border-collapse: collapse; font-size: 13px; background: var(--card); }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: #fafbfc; font-weight: 600; color: var(--muted); white-space: nowrap; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; }
.badge.pending { background: #fff7ed; color: #c2410c; }
.badge.shipped { background: #f0fdf4; color: var(--ok); }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tabs button { background: #fff; color: var(--text); border: 1px solid var(--border); }
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.spec-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: center; }
.spec-row input { flex: 1; }
.spec-row input.price { max-width: 120px; flex: none; }
.center { text-align: center; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }