:root {
    --sidebar: #1a1f2e;
    --sidebar-hover: #252b3d;
    --accent: #3b82f6;
    --bg: #f0f2f5;
    --card: #ffffff;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --radius: 8px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); }
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--sidebar); color: #fff; display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-brand { padding: 20px; font-size: 18px; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,.1); }
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a { display: block; padding: 10px 20px; color: rgba(255,255,255,.7); text-decoration: none; font-size: 14px; transition: .15s; }
.sidebar nav a:hover, .sidebar nav a.active { background: var(--sidebar-hover); color: #fff; border-left: 3px solid var(--accent); }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,.1); font-size: 13px; }
.sidebar-footer a { color: rgba(255,255,255,.6); text-decoration: none; }
.content { flex: 1; padding: 28px; overflow-y: auto; }
.page-title { font-size: 22px; font-weight: 600; margin-bottom: 24px; }
.card { background: var(--card); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card); border-radius: var(--radius); padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.stat-card .label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.stat-card .value { font-size: 28px; font-weight: 700; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--bg); color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
td { padding: 10px 12px; border-bottom: 1px solid var(--bg); }
tr:hover { background: #f9fafb; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge-active { background: #dcfce7; color: var(--success); }
.badge-inactive { background: #fee2e2; color: var(--danger); }
.btn { display: inline-block; padding: 8px 16px; border: none; border-radius: var(--radius); font-size: 14px; cursor: pointer; text-decoration: none; transition: .15s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #2563eb; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-success { background: var(--success); color: #fff; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-size: 14px; font-weight: 500; }
.form-group input, .form-group select { width: 100%; padding: 8px 12px; border: 1px solid #d1d5db; border-radius: var(--radius); font-size: 14px; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
.form-actions { display: flex; gap: 12px; margin-top: 24px; }
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; }
.alert-success { background: #dcfce7; color: var(--success); }
.alert-error { background: #fee2e2; color: var(--danger); }
.alert-warning { background: #fef3c7; color: var(--warning); }
.search-bar { display: flex; gap: 12px; margin-bottom: 20px; align-items: center; }
.search-bar input { padding: 8px 12px; border: 1px solid #d1d5db; border-radius: var(--radius); font-size: 14px; width: 240px; }
.hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.confirm-input { width: 100%; padding: 8px 12px; border: 1px solid var(--danger); border-radius: var(--radius); font-size: 14px; }