:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #232a3e;
  --bg-input: #1e2538;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #2d3548;
  --border-hover: #4a5568;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
  --sidebar-width: 240px;
}

* { 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-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
}

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform var(--transition);
}
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}
.sidebar-logo {
  font-size: 20px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sidebar-logo-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.sidebar-nav {
  flex: 1;
  padding: 12px;
  overflow-y: auto;
}
.sidebar-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition);
  margin-bottom: 2px;
  text-decoration: none;
}
.sidebar-item:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.sidebar-item.active { background: var(--accent); color: white; }
.sidebar-item .badge {
  margin-left: auto;
  background: var(--danger);
  color: white;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
}
.sidebar-user .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
}

/* ===== Main ===== */
.admin-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 24px;
  min-height: 100vh;
}
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.admin-header h1 {
  font-size: 24px;
  font-weight: 800;
}
.admin-header-actions {
  display: flex;
  gap: 8px;
}

/* ===== Tabs ===== */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== Dashboard ===== */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.dashboard-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.dashboard-card .number {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
}
.dashboard-card .label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Buttons ===== */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #f87171; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--accent); color: var(--text-primary); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-xs { padding: 3px 8px; font-size: 11px; }

/* ===== Tables ===== */
.table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow-x: auto;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  background: var(--bg-secondary);
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}
.data-table tr:hover td { background: var(--bg-card-hover); }
.data-table .actions {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.data-table .badge-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}
.badge-active { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-inactive { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-pending { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-user { background: rgba(99,102,241,0.15); color: var(--accent); }
.badge-admin { background: rgba(34,197,94,0.15); color: var(--success); }

/* ===== Forms ===== */
.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition);
  font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
  width: 100%;
  max-width: 600px;
  max-height: 85vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
}
.modal-header h2 { font-size: 18px; font-weight: 700; }
.modal-close {
  width: 32px; height: 32px;
  border: none; background: var(--bg-input);
  border-radius: 50%; font-size: 16px; cursor: pointer;
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: var(--danger); color: white; }
.modal-body { padding: 24px; }
.form-actions { display: flex; gap: 8px; margin-top: 16px; justify-content: flex-end; }

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 14px;
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--accent); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ===== Alert ===== */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}
.alert.error { display: block; background: rgba(239,68,68,0.15); color: var(--danger); border: 1px solid rgba(239,68,68,0.3); }
.alert.success { display: block; background: rgba(34,197,94,0.15); color: var(--success); border: 1px solid rgba(34,197,94,0.3); }

/* ===== Recent Comments ===== */
.recent-comments { max-height: 400px; overflow-y: auto; }
.recent-comment-item {
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  background: var(--bg-primary);
}
.recent-comment-item .rc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.recent-comment-item .rc-user { font-weight: 600; font-size: 13px; }
.recent-comment-item .rc-gpu { font-size: 12px; color: var(--text-muted); }
.recent-comment-item .rc-content { font-size: 13px; color: var(--text-secondary); }
.recent-comment-item .rc-time { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* ===== Color Picker ===== */
.color-swatch {
  display: inline-block;
  width: 20px; height: 20px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  vertical-align: middle;
  cursor: pointer;
}

/* ===== Mobile ===== */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 150;
  padding: 8px 12px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 18px;
  cursor: pointer;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 260px;
  }
  .sidebar.open { transform: translateX(0); }
  .admin-main { margin-left: 0; padding: 16px; }
  .mobile-toggle { display: block; }
  .dashboard-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .modal-content { max-width: 95vw; }
  .admin-header { flex-direction: column; align-items: flex-start; }
}