:root {
  --primary: #2d3436;
  --accent: #00B894;
  --accent-dark: #00A381;
  --danger: #E74C3C;
  --danger-bg: #FDECEA;
  --warn: #F39C12;
  --info: #3498DB;
  --text: #2d3436;
  --text-sub: #636e72;
  --text-light: #b2bec3;
  --bg: #f1f2f6;
  --card: #fff;
  --border: #dfe6e9;
  --sidebar-w: 220px;
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); font-size:14px; }
a { color:inherit; text-decoration:none; }
input,button,select,textarea { font-family:inherit; font-size:inherit; border:none; outline:none; }
button { cursor:pointer; }

.layout { display:flex; min-height:100vh; }

/* Sidebar */
.sidebar { width: var(--sidebar-w); background: var(--primary); color: #dfe6e9; position: fixed; top:0; bottom:0; left:0; display:flex; flex-direction:column; z-index:100; transition: transform .3s; }
.sidebar .logo { padding: 20px 16px; font-size: 18px; font-weight: 700; color:#fff; border-bottom: 1px solid rgba(255,255,255,0.1); display:flex; align-items:center; gap:8px; }
.sidebar .logo .dot { width:10px; height:10px; border-radius:50%; background:var(--accent); }
.sidebar nav { flex:1; padding:12px 0; }
.sidebar nav a { display:flex; align-items:center; gap:10px; padding:12px 20px; color:#b2bec3; font-size:14px; transition: all .15s; border-left:3px solid transparent; }
.sidebar nav a:hover { background: rgba(255,255,255,0.05); color:#fff; }
.sidebar nav a.active { background: rgba(0,184,148,0.15); color:var(--accent); border-left-color:var(--accent); }
.sidebar nav a svg { width:20px; height:20px; }
.sidebar .user-box { padding:12px 20px; border-top:1px solid rgba(255,255,255,0.1); font-size:13px; }
.sidebar .user-box .name { color:#fff; font-weight:500; }
.sidebar .user-box .role { color:#b2bec3; font-size:12px; }
.sidebar .user-box .account-action { color:var(--accent); cursor:pointer; margin-top:7px; margin-right:12px; display:inline-block; font-size:13px; }
.sidebar .user-box .logout { color:var(--danger); cursor:pointer; margin-top:6px; display:inline-block; font-size:13px; }

/* Main */
.main { flex:1; margin-left: var(--sidebar-w); padding:24px; }

/* Topbar */
.page-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:24px; }
.page-header h1 { font-size:22px; font-weight:600; }
.page-desc { color:var(--text-sub); font-size:13px; margin-top:5px; }
.page-header .actions { display:flex; gap:8px; }

/* Cards */
.card { background:var(--card); border-radius:12px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); padding:20px; margin-bottom:20px; }
.card-title { font-size:16px; font-weight:600; margin-bottom:16px; }

/* Stats grid */
.stats-grid { display:grid; grid-template-columns: repeat(4, 1fr); gap:16px; margin-bottom:24px; }
.stat-card { background:var(--card); border-radius:12px; padding:20px; box-shadow:0 1px 3px rgba(0,0,0,0.06); }
.stat-card .stat-icon { width:40px; height:40px; border-radius:10px; display:flex; align-items:center; justify-content:center; margin-bottom:12px; }
.stat-card .stat-icon svg { width:22px; height:22px; color:#fff; }
.stat-card .stat-value { font-size:28px; font-weight:700; }
.stat-card .stat-label { font-size:13px; color:var(--text-sub); margin-top:2px; }
.bg-accent { background:var(--accent); }
.bg-info { background:var(--info); }
.bg-warn { background:var(--warn); }
.bg-danger { background:var(--danger); }

/* Tables */
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse:collapse; }
table th { text-align:left; padding:12px; font-size:13px; color:var(--text-sub); font-weight:500; border-bottom:2px solid var(--border); }
table td { padding:12px; font-size:14px; border-bottom:1px solid var(--border); }
table tr:hover td { background: var(--bg); }
.tag { display:inline-block; padding:2px 8px; border-radius:4px; font-size:12px; }
.tag-active { background:#d4f5e9; color:#00a86b; }
.tag-disabled { background:#fce4e4; color:#c0392b; }
.tag-admin { background:#e8daef; color:#7d3c98; }
.tag-super { background:#fce4b6; color:#b9770e; }

/* Pagination */
.pagination { display:flex; align-items:center; justify-content:center; gap:8px; margin-top:16px; }
.pagination button { padding:6px 12px; border:1px solid var(--border); border-radius:6px; background:#fff; font-size:13px; }
.pagination button.active { background:var(--accent); color:#fff; border-color:var(--accent); }
.pagination button:disabled { opacity:0.4; }

/* Forms */
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:13px; color:var(--text-sub); margin-bottom:6px; }
.form-input { width:100%; padding:10px 14px; border:1px solid var(--border); border-radius:8px; font-size:14px; transition:border-color .2s; }
.form-input:focus { border-color:var(--accent); }
.form-input.ai-prompt { resize:vertical; line-height:1.65; }
.form-help { margin-top:5px; color:var(--text-light); font-size:11px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.audit-filter { width:260px; margin-bottom:16px; }
.audit-filter label { display:block; color:var(--text-sub); font-size:12px; margin-bottom:6px; }

/* Buttons */
.btn { padding:10px 18px; border-radius:8px; font-size:14px; font-weight:500; transition:opacity .2s; display:inline-flex; align-items:center; gap:6px; }
.btn-primary { background:var(--accent); color:#fff; }
.btn-outline { background:transparent; border:1px solid var(--border); color:var(--text); }
.btn-danger { background:var(--danger); color:#fff; }
.btn-sm { padding:5px 10px; font-size:12px; border-radius:6px; }
.btn:disabled { opacity:0.5; }

/* Search bar */
.search-bar { position:relative; margin-bottom:16px; }
.search-bar input { width:100%; max-width:320px; padding:9px 14px 9px 36px; border:1px solid var(--border); border-radius:8px; font-size:14px; }
.search-bar svg { position:absolute; left:10px; top:50%; transform:translateY(-50%); width:18px; height:18px; color:var(--text-light); }

/* Modal */
.modal-overlay { position:fixed; inset:0; background:rgba(0,0,0,0.4); z-index:200; display:flex; align-items:center; justify-content:center; }
.modal { background:#fff; border-radius:12px; padding:24px; width:90%; max-width:480px; max-height:85vh; overflow-y:auto; }
.modal h3 { font-size:18px; margin-bottom:16px; }
.modal-close { float:right; font-size:22px; color:var(--text-light); cursor:pointer; }

/* Login page */
.login-page { display:flex; align-items:center; justify-content:center; min-height:100vh; background:var(--primary); }
.login-box { background:#fff; border-radius:16px; padding:40px; width:90%; max-width:400px; box-shadow:0 8px 40px rgba(0,0,0,0.2); }
.login-box .logo { text-align:center; margin-bottom:24px; }
.login-box .logo h1 { font-size:22px; }
.login-box .logo p { font-size:13px; color:var(--text-sub); margin-top:4px; }

/* Toast */
.toast { position:fixed; top:20px; left:50%; transform:translateX(-50%); background:rgba(0,0,0,0.8); color:#fff; padding:10px 24px; border-radius:8px; font-size:14px; z-index:300; animation:toastIn .3s; }
@keyframes toastIn { from{opacity:0;transform:translateX(-50%) translateY(-10px);} to{opacity:1;transform:translateX(-50%) translateY(0);} }

/* Loading */
.loading { text-align:center; padding:40px; color:var(--text-sub); }
.spinner { width:32px; height:32px; border:3px solid var(--border); border-top-color:var(--accent); border-radius:50%; animation:spin .8s linear infinite; margin:0 auto 8px; }
@keyframes spin { to{transform:rotate(360deg);} }

/* Chart container */
.chart-container { width:100%; overflow-x:auto; }
.ai-stats .stat-value small { margin-left:3px; color:var(--text-sub); font-size:12px; font-weight:500; }.ai-config-grid { display:grid; grid-template-columns:minmax(320px,.8fr) minmax(420px,1.2fr); gap:20px; }.admin-switch { position:relative; min-height:62px; display:flex; align-items:center; justify-content:space-between; gap:15px; margin-bottom:18px; padding:12px; border-radius:10px; background:var(--bg); }.admin-switch strong,.admin-switch small { display:block; }.admin-switch small { margin-top:3px; color:var(--text-sub); font-size:11px; }.admin-switch input { position:absolute; opacity:0; }.admin-switch i { position:relative; flex:0 0 44px; width:44px; height:25px; border-radius:999px; background:#c8cbd0; }.admin-switch i:after { content:''; position:absolute; top:3px; left:3px; width:19px; height:19px; border-radius:50%; background:#fff; transition:.2s; }.admin-switch input:checked+i { background:var(--accent); }.admin-switch input:checked+i:after { transform:translateX(19px); }.ai-safety-note { padding:13px; border-left:3px solid var(--accent); color:var(--text-sub); background:#F0FAF7; font-size:12px; line-height:1.6; }.ai-safety-note strong { color:var(--text); }.ai-error-cell { max-width:240px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

/* Responsive */
.menu-toggle { display:none; position:fixed; top:16px; right:16px; z-index:101; width:40px; height:40px; border-radius:8px; background:var(--primary); color:#fff; align-items:center; justify-content:center; }
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left:0; padding:16px; padding-top:60px; }
  .menu-toggle { display:flex; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-config-grid { grid-template-columns:1fr; }
  table { font-size:12px; }
  table th, table td { padding:8px 6px; }
}