:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #242836;
  --bg-input: #1e2230;
  --border: rgba(255,255,255,0.08);
  --text: #e8eaed;
  --text-muted: #8b8fa3;
  --gold: #f5a623;
  --gold-dim: rgba(245,166,35,0.15);
  --primary: #4a90d9;
  --primary-dim: rgba(74,144,217,0.15);
  --success: #4caf50;
  --success-dim: rgba(76,175,80,0.15);
  --danger: #f44336;
  --danger-dim: rgba(244,67,54,0.15);
  --warning: #ff9800;
  --warning-dim: rgba(255,152,0,0.15);
  --sidebar-w: 220px;
  --topbar-h: 56px;
  --radius: 10px;
}

* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; border: none; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 500; transition: all .2s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #3a7bc8; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-muted); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 4px 12px; font-size: 12px; border-radius: 6px; }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg); }
.login-card { width: 380px; padding: 48px 36px; background: var(--bg-card); border-radius: 16px; border: 1px solid var(--border); text-align: center; }
.login-logo { font-size: 48px; margin-bottom: 8px; }
.login-card h1 { font-size: 22px; margin-bottom: 4px; }
.login-subtitle { color: var(--text-muted); font-size: 14px; margin-bottom: 28px; }
.form-group { margin-bottom: 18px; text-align: left; }
.form-group label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; outline: none; transition: border-color .2s; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }

.login-tip { color: var(--text-muted); font-size: 12px; margin-top: 16px; }

/* Layout */
.app { display: flex; height: 100vh; overflow: hidden; }
.sidebar { width: var(--sidebar-w); background: var(--bg-card); border-right: 1px solid var(--border); display: flex; flex-direction: column; flex-shrink: 0; transition: transform .3s; z-index: 100; }
.sidebar-header { display: flex; align-items: center; gap: 10px; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.sidebar-logo { font-size: 24px; }
.sidebar-title { font-size: 18px; font-weight: 700; color: var(--gold); }
.sidebar-store { padding: 12px 20px; font-size: 13px; color: var(--text-muted); border-bottom: 1px solid var(--border); cursor: pointer; }
.sidebar-store:hover { color: var(--gold); }
.sidebar-nav { flex: 1; padding: 12px 10px; overflow-y: auto; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 8px; color: var(--text-muted); text-decoration: none; cursor: pointer; transition: all .15s; font-size: 14px; }
.nav-item:hover { background: var(--bg-hover); color: var(--text); }
.nav-item.active { background: var(--primary-dim); color: var(--primary); font-weight: 600; }
.nav-icon { font-size: 18px; width: 24px; text-align: center; }
.sidebar-footer { padding: 14px 20px; border-top: 1px solid var(--border); }

.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar { height: var(--topbar-h); display: flex; align-items: center; gap: 16px; padding: 0 24px; border-bottom: 1px solid var(--border); background: var(--bg-card); flex-shrink: 0; }
.topbar h2 { font-size: 17px; font-weight: 600; }
.topbar-right { margin-left: auto; font-size: 13px; color: var(--text-muted); }
.menu-toggle { display: none; background: none; border: none; color: var(--text); font-size: 20px; cursor: pointer; }
.content-area { flex: 1; padding: 24px; overflow-y: auto; }

/* Cards */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-title { font-size: 16px; font-weight: 600; }

/* Stat cards */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.stat-label { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 700; }
.stat-value.gold { color: var(--gold); }
.stat-value.green { color: var(--success); }
.stat-value.blue { color: var(--primary); }
.stat-value.red { color: var(--danger); }
.stat-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
th { color: var(--text-muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; background: rgba(255,255,255,0.02); }
tr:hover td { background: var(--bg-hover); }

/* Tags */
.tag { display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: 12px; font-weight: 500; }
.tag-success { background: var(--success-dim); color: var(--success); }
.tag-danger { background: var(--danger-dim); color: var(--danger); }
.tag-warning { background: var(--warning-dim); color: var(--warning); }
.tag-info { background: var(--primary-dim); color: var(--primary); }
.tag-gold { background: var(--gold-dim); color: var(--gold); }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 200; }
.modal-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 28px; width: 440px; max-width: 90vw; max-height: 80vh; overflow-y: auto; }
.modal-box h3 { margin-bottom: 18px; font-size: 18px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* Empty */
.empty-state { text-align: center; padding: 48px 20px; color: var(--text-muted); }
.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { position: fixed; left: 0; top: 0; bottom: 0; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: block; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .content-area { padding: 16px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.fade-in { animation: fadeIn .3s ease; }