:root {
  --primary: #1a56db;
  --primary-hover: #1e40af;
  --primary-light: #e6f1fb;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --purple: #7c3aed;
  --purple-light: #f3e8ff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --white: #ffffff;
  --radius: 8px;
  --radius-lg: 12px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --transition: all 0.15s;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-family); background: var(--gray-50); color: var(--gray-900); }

.app-layout { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--gray-900); color: var(--white); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100; }
.sidebar-brand { padding: 20px; font-size: 18px; font-weight: 700; border-bottom: 1px solid var(--gray-700); }
.nav-menu { flex: 1; padding: 12px 0; overflow-y: auto; }
.nav-item { display: block; padding: 10px 20px; color: var(--gray-300); text-decoration: none; font-size: 14px; transition: var(--transition); cursor: pointer; border-left: 3px solid transparent; }
.nav-item:hover { color: var(--white); background: rgba(255,255,255,0.05); }
.nav-item.active { color: var(--white); background: rgba(255,255,255,0.1); border-left-color: var(--primary); }
.sidebar-footer { padding: 12px 16px; border-top: 1px solid var(--gray-700); display: flex; align-items: center; justify-content: space-between; }
.current-user { font-size: 13px; color: var(--gray-300); }

.main-content { margin-left: 220px; flex: 1; display: flex; flex-direction: column; }
.topbar { padding: 16px 24px; background: var(--white); border-bottom: 1px solid var(--gray-200); }
.topbar h2 { font-size: 20px; font-weight: 600; }
.content-area { padding: 24px; flex: 1; }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card { background: var(--white); padding: 40px; border-radius: var(--radius-lg); box-shadow: 0 4px 24px rgba(0,0,0,0.1); width: 380px; }
.login-card h1 { text-align: center; margin-bottom: 32px; font-size: 22px; color: var(--gray-900); }
.login-error { color: var(--danger); font-size: 13px; margin-top: 12px; text-align: center; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 500; color: var(--gray-700); }
.form-input, .form-select, .form-textarea { width: 100%; padding: 8px 12px; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 14px; font-family: var(--font-family); transition: var(--transition); }
.form-input:focus, .form-select:focus, .form-textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-textarea { resize: vertical; min-height: 80px; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 8px 16px; border: 1px solid transparent; border-radius: var(--radius); font-size: 14px; font-weight: 500; cursor: pointer; transition: var(--transition); gap: 6px; }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { background: var(--white); color: var(--gray-700); border-color: var(--gray-300); }
.btn-outline:hover { background: var(--gray-50); }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-block { width: 100%; }

.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.page-header h3 { font-size: 18px; }
.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.search-input { width: 240px; }

table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: var(--radius); overflow: hidden; }
th, td { padding: 10px 14px; text-align: left; font-size: 13px; border-bottom: 1px solid var(--gray-200); }
th { background: var(--gray-50); font-weight: 600; color: var(--gray-700); white-space: nowrap; }
tr:hover td { background: var(--gray-50); }

.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 11px; font-weight: 500; white-space: nowrap; }
.badge-strategic { background: var(--purple-light); color: var(--purple); }
.badge-key { background: #fce7f3; color: #be185d; }
.badge-normal { background: var(--gray-100); color: var(--gray-700); }
.badge-potential { background: var(--success-light); color: var(--success); }
.badge-active { background: var(--success-light); color: var(--success); }
.badge-champion { background: var(--warning-light); color: var(--warning); }
.badge-tech { background: var(--primary-light); color: var(--primary); }
.badge-decision { background: var(--purple-light); color: var(--purple); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-info { background: var(--primary-light); color: var(--primary); }

.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 20px; }
.pagination button { padding: 6px 12px; border: 1px solid var(--gray-300); border-radius: var(--radius); background: var(--white); cursor: pointer; font-size: 13px; }
.pagination button:hover:not(:disabled) { background: var(--gray-50); border-color: var(--primary); }
.pagination button:disabled { opacity: 0.4; cursor: default; }
.pagination span { font-size: 13px; color: var(--gray-500); }

.toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: var(--radius); font-size: 13px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); animation: slideIn 0.3s ease; }
.toast-success { background: var(--success); color: var(--white); }
.toast-error { background: var(--danger); color: var(--white); }
.toast-warning { background: var(--warning); color: var(--white); }
.toast-info { background: var(--primary); color: var(--white); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 1000; display: flex; align-items: center; justify-content: center; }
.modal-box { background: var(--white); border-radius: var(--radius-lg); width: 620px; max-height: 85vh; overflow-y: auto; box-shadow: 0 8px 32px rgba(0,0,0,0.2); }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; border-bottom: 1px solid var(--gray-200); }
.modal-header h3 { font-size: 16px; }
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--gray-500); }
.modal-body { padding: 20px 24px; }
.modal-body .form-group { margin-bottom: 14px; }
.modal-body label { font-size: 13px; }
.modal-body .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.modal-body .form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 24px; border-top: 1px solid var(--gray-200); }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--white); padding: 20px; border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); margin-top: 4px; }

.empty-state { text-align: center; padding: 40px; color: var(--gray-500); font-size: 14px; }

.tree-node { margin-left: 24px; }
.tree-node-header { display: flex; align-items: center; gap: 8px; padding: 6px 0; cursor: pointer; }
.tree-node-header .arrow { transition: transform 0.2s; font-size: 12px; }
.tree-node-header.expanded .arrow { transform: rotate(90deg); }
.tree-node-header .node-label { font-size: 14px; }

@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar-brand { font-size: 0; padding: 16px; text-align: center; }
  .nav-item { padding: 10px; text-align: center; font-size: 0; }
  .nav-item::first-letter { font-size: 14px; }
  .sidebar-footer { flex-direction: column; }
  .main-content { margin-left: 60px; }
  .modal-box { width: 95%; }
}