:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --border: #e3e8ef;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-d: #1d4ed8;
  --ok: #15803d;
  --warn: #b45309;
  --danger: #b91c1c;
  --wait: #475569;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: #111827;
  color: #cbd5e1;
  flex: 0 0 220px;
  padding: 18px 0;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar .brand {
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  padding: 6px 20px 18px;
  border-bottom: 1px solid #1f2937;
  margin-bottom: 12px;
}
.sidebar nav a {
  display: block;
  color: #cbd5e1;
  padding: 11px 20px;
  font-size: 14px;
}
.sidebar nav a:hover { background: #1f2937; color: #fff; text-decoration: none; }
.sidebar nav a.on { background: var(--primary); color: #fff; }

.content { flex: 1; min-width: 0; padding: 22px 28px; }
.topbar { margin-bottom: 18px; }
.topbar h1 { font-size: 22px; margin: 0; }

/* 卡片 / 面板 */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}
.panel h2 { margin: 0 0 14px; font-size: 16px; }

/* 统计卡片 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 18px; }
.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.stat .num { font-size: 28px; font-weight: 700; }
.stat .lbl { color: var(--muted); margin-top: 4px; }
.stat.danger .num { color: var(--danger); }
.stat.warn .num { color: var(--warn); }
.stat.ok .num { color: var(--ok); }

/* 表格 */
table { width: 100%; border-collapse: collapse; background: var(--panel); }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f8fafc; color: var(--muted); font-weight: 600; font-size: 13px; }
tr:hover td { background: #f9fbff; }

/* 表单 */
.form-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 13px; color: var(--muted); }
input, select, textarea {
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  border-radius: 7px;
  cursor: pointer;
  font-size: 14px;
}
.btn:hover { background: var(--primary-d); text-decoration: none; }
.btn.gray { background: #fff; color: var(--text); border-color: var(--border); }
.btn.gray:hover { background: #f1f5f9; }
.btn.sm { padding: 5px 11px; font-size: 13px; }
.btn.danger { background: #fff; color: var(--danger); border-color: #fca5a5; }
.btn.danger:hover { background: #fef2f2; }

/* 状态标签 */
.tag { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.tag.ok { background: #dcfce7; color: var(--ok); }
.tag.warn { background: #fef3c7; color: var(--warn); }
.tag.danger { background: #fee2e2; color: var(--danger); }
.tag.wait { background: #e2e8f0; color: var(--wait); }

/* 提示 */
.alert { padding: 11px 14px; border-radius: 7px; margin-bottom: 16px; }
.alert.info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
.alert.success { background: #f0fdf4; color: var(--ok); border: 1px solid #bbf7d0; }
.alert.error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }

.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tabs a { padding: 7px 14px; border: 1px solid var(--border); border-radius: 20px; color: var(--muted); }
.tabs a.on { background: var(--primary); color: #fff; border-color: var(--primary); }

.muted { color: var(--muted); }
.right { text-align: right; }
.center { text-align: center; }
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.empty { text-align: center; color: var(--muted); padding: 30px; }

@media (max-width: 880px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .grid2, .grid3 { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}