:root {
  --bg: #f3f5f7;
  --panel: #fff;
  --text: #1f2329;
  --muted: #646a73;
  --line: #e5e6eb;
  --accent: #e02e24;
  --sider: #1a1d24;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  display: flex;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
.sider {
  width: 220px;
  background: var(--sider);
  color: #fff;
  flex-shrink: 0;
}
.brand {
  padding: 20px 18px;
  font-weight: 700;
  font-size: 16px;
  border-bottom: 1px solid #2c313a;
}
.sider nav { display: flex; flex-direction: column; padding: 12px 0; }
.sider nav a {
  color: #c9cdd4;
  padding: 10px 18px;
}
.sider nav a:hover { background: #262b34; color: #fff; }
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.shop-switch { display: flex; align-items: center; gap: 8px; }
.shop-switch select { min-width: 220px; padding: 6px 8px; }
.user { color: var(--muted); display: flex; gap: 12px; align-items: center; }
.content { padding: 20px; }
.flash {
  margin: 12px 20px 0;
  padding: 10px 12px;
  background: #e8f6ee;
  border: 1px solid #b7e0c5;
  border-radius: 6px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px; }
.stat .n { font-size: 28px; font-weight: 700; margin-top: 8px; }
.stat .l { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; background: var(--panel); }
th, td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; font-size: 14px; }
th { background: #fafafa; color: var(--muted); font-weight: 600; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  border: 0;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
}
.btn.secondary { background: #4e5969; }
.btn.ghost { background: #fff; color: var(--text) !important; border: 1px solid var(--line); }
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; align-items: center; }
input[type=text], input[type=password], input[type=number], input[type=date], select, textarea {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.thumb { width: 48px; height: 48px; object-fit: cover; border-radius: 4px; background: #eee; }
.muted { color: var(--muted); }
.login-wrap {
  min-height: 100vh; width: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #1a1d24, #3a1010 60%, #e02e24);
}
.login-box {
  width: 360px; background: #fff; border-radius: 10px; padding: 28px;
  box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
.login-box h1 { margin: 0 0 8px; font-size: 20px; }
.login-box p { margin: 0 0 20px; color: var(--muted); }
.login-box label { display: block; margin: 12px 0 6px; font-size: 13px; }
.login-box input { width: 100%; }
.login-box button { width: 100%; margin-top: 18px; }
.error { color: #c00; font-size: 13px; margin-top: 8px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; background: #fff1f0; color: #cf1322; font-size: 12px; }
@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .sider { width: 160px; }
}