:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --secondary: #1e3a5f;
  --accent: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f5f7fa;
  --sidebar: #1a2332;
  --text: #333;
  --text-light: #666;
  --border: #e5e7eb;
  --white: #fff;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
button, .btn { cursor: pointer; border: none; border-radius: 4px; padding: 8px 20px; font-size: 14px; transition: .2s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #16a34a; }
.btn-secondary { background: #64748b; color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 4px 12px; font-size: 12px; }
input, select, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 4px; font-size: 14px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(13,148,136,.15); }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-light); }
.hidden { display: none !important; }
.text-danger { color: var(--danger); }
.text-success { color: var(--accent); }
.text-muted { color: var(--text-light); font-size: 13px; }
.alert { padding: 12px 16px; border-radius: 4px; margin-bottom: 16px; }
.alert-danger { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }
.alert-warning { background: #fffbeb; color: #b45309; border: 1px solid #fde68a; }
table { width: 100%; border-collapse: collapse; background: var(--white); }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: #f8fafc; font-weight: 600; color: var(--text-light); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px; }
.badge-success { background: #dcfce7; color: #15803d; }
.badge-warning { background: #fef3c7; color: #b45309; }
.badge-info { background: #dbeafe; color: #1d4ed8; }
.badge-danger { background: #fee2e2; color: #b91c1c; }
.pagination { display: flex; gap: 8px; align-items: center; margin-top: 16px; justify-content: flex-end; }
.card { background: var(--white); border-radius: 8px; box-shadow: var(--shadow); padding: 24px; margin-bottom: 20px; }
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }