:root {
  --bg-body: #e8eaed;
  --bg-sidebar: #1f2937;
  --bg-card: #ffffff;
  --bg-hover: #f3f4f6;
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --border: #d1d5db;
  --border-strong: #9ca3af;
  --primary: #f97316;
  --primary-dark: #ea580c;
  --primary-light: #ffedd5;
  --secondary: #4b5563;
  --success: #16a34a;
  --warning: #eab308;
  --danger: #dc2626;
  --info: #0ea5e9;
  --steel: #64748b;
  --header-height: 56px;
  --topnav-height: 44px;
  --sidebar-width: 220px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--bg-body);
  color: var(--text-main);
  font-size: 14px;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Header */
.header {
  height: var(--header-height);
  background: var(--bg-sidebar);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
.header .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.header .brand .logo {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: #fff;
}
.header .userbar {
  display: flex;
  align-items: center;
  gap: 16px;
  color: #d1d5db;
}

/* Body */
.body {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

/* Top navigation with dropdown groups (replaces left sidebar) */
.sidebar {
  position: relative;
  height: var(--topnav-height);
  background: var(--bg-sidebar);
  color: #d1d5db;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 100;
  overflow: visible;
}
.nav-scroll {
  display: flex;
  align-items: center;
  flex: 1;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 12px;
}
.nav-scroll::-webkit-scrollbar { height: 4px; }
.nav-scroll::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }
.sidebar .nav-group {
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding: 0 14px;
  cursor: pointer;
  transition: background .15s, color .15s;
  border-bottom: 2px solid transparent;
  user-select: none;
  white-space: nowrap;
}
.sidebar .nav-group:hover,
.sidebar .nav-group.open {
  background: rgba(255,255,255,0.06);
  color: #fff;
}
.sidebar .nav-group.active {
  color: var(--primary-light);
  border-bottom-color: var(--primary);
}
.sidebar .nav-title {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.sidebar .nav-title .caret {
  width: 12px;
  height: 12px;
  opacity: .7;
  transition: transform .15s;
}
.sidebar .nav-group.open .nav-title .caret {
  transform: rotate(180deg);
}
.nav-dropdown-panel {
  display: none;
  position: absolute;
  top: var(--topnav-height);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  padding: 14px 20px;
  z-index: 200;
  max-height: calc(100vh - var(--header-height) - var(--topnav-height) - 20px);
  overflow-y: auto;
}
.nav-dropdown-panel.open { display: block; }
.nav-dropdown-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.nav-dropdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}
.sidebar .nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s, color .15s;
  text-decoration: none;
  color: var(--text-main);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
}
.sidebar .nav-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}
.sidebar .nav-item.active {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary);
}
.sidebar .nav-item svg {
  width: 16px;
  height: 16px;
  opacity: .9;
  flex-shrink: 0;
}

/* Main */
.main {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}
.page-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}
.page-desc {
  color: var(--text-muted);
  margin-top: -12px;
  margin-bottom: 16px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  margin-bottom: 16px;
  overflow: hidden;
}
.card-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: #fafafa;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}
.card-body {
  padding: 18px;
}
.card-footer {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  background: #fafafa;
}

/* Grid */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}
.col-3 { flex: 1 1 calc(25% - 12px); min-width: 220px; }
.col-4 { flex: 1 1 calc(33.333% - 11px); min-width: 260px; }
.col-6 { flex: 1 1 calc(50% - 8px); min-width: 300px; }
.col-8 { flex: 1 1 calc(66.666% - 6px); min-width: 420px; }
.col-9 { flex: 1 1 calc(75% - 4px); min-width: 500px; }

/* KPI */
.kpi-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px;
}
.kpi-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  color: var(--primary-dark);
}
.kpi-icon svg { width: 24px; height: 24px; }
.kpi-value {
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
}
.kpi-label {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}
.kpi-delta {
  font-size: 12px;
  margin-top: 6px;
}
.kpi-delta.up { color: var(--success); }
.kpi-delta.down { color: var(--danger); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  background: #fff;
  color: var(--text-main);
  border-color: var(--border-strong);
  transition: all .15s;
}
.btn:hover { background: var(--bg-hover); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary-dark); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--secondary); color: #fff; border-color: #374151; }
.btn-secondary:hover { background: #374151; }
.btn-success { background: var(--success); color: #fff; border-color: #15803d; }
.btn-success:hover { background: #15803d; }
.btn-danger { background: var(--danger); color: #fff; border-color: #b91c1c; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: #1f2937; border-color: #ca8a04; }
.btn-warning:hover { background: #ca8a04; color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* Tables */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
th, td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th {
  background: #f9fafb;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}
tr:hover td { background: #f9fafb; }
td.actions { white-space: nowrap; }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .3px;
}
.badge-default { background: #e5e7eb; color: #374151; }
.badge-primary { background: var(--primary-light); color: var(--primary-dark); }
.badge-success { background: #dcfce7; color: var(--success); }
.badge-warning { background: #fef9c3; color: #a16207; }
.badge-danger { background: #fee2e2; color: var(--danger); }
.badge-info { background: #e0f2fe; color: #0369a1; }
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* Forms */
.form-row {
  display: flex;
  gap: 16px;
  margin-bottom: 14px;
}
.form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-weight: 600;
  font-size: 12px;
  color: var(--text-muted);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  background: #fff;
  color: var(--text-main);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}
.form-group .hint {
  font-size: 11px;
  color: var(--text-muted);
}

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.search-box {
  position: relative;
}
.search-box input {
  padding: 7px 10px 7px 32px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  min-width: 220px;
}
.search-box svg {
  position: absolute;
  left: 9px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(17,24,39,0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.modal-overlay.show { display: flex; }
.modal {
  background: #fff;
  border-radius: 8px;
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.modal.modal-lg { max-width: 900px; }
.modal-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 16px;
}
.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
}
.modal-body { padding: 18px; overflow-y: auto; }
.modal-footer {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Toast */
#toastContainer {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: #fff;
  border-left: 4px solid var(--primary);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  padding: 12px 16px;
  border-radius: 4px;
  min-width: 260px;
  animation: toastIn .25s ease;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast.info { border-left-color: var(--info); }
.toast-title { font-weight: 700; margin-bottom: 2px; }
.toast-msg { color: var(--text-muted); font-size: 13px; }
@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
  gap: 4px;
}
.tab {
  padding: 10px 16px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-weight: 600;
}
.tab:hover { color: var(--text-main); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Progress */
.progress {
  height: 8px;
  background: #e5e7eb;
  border-radius: 4px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--primary);
  transition: width .3s;
}
.progress-bar.success { background: var(--success); }
.progress-bar.warning { background: var(--warning); }
.progress-bar.danger { background: var(--danger); }

/* Timeline / Calendar */
.gantt-wrap {
  position: relative;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}
.gantt-row {
  display: flex;
  border-bottom: 1px solid #f3f4f6;
  min-height: 44px;
  align-items: center;
}
.gantt-label {
  width: 160px;
  flex-shrink: 0;
  padding: 0 12px;
  font-weight: 600;
  border-right: 1px solid var(--border);
  background: #fafafa;
  height: 100%;
  display: flex;
  align-items: center;
}
.gantt-track {
  flex: 1;
  position: relative;
  height: 44px;
}
.gantt-grid {
  position: absolute;
  inset: 0;
  display: flex;
}
.gantt-grid .slot {
  flex: 1;
  border-right: 1px dashed #e5e7eb;
}
.gantt-bar {
  position: absolute;
  top: 8px;
  height: 28px;
  border-radius: 4px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 0 8px;
  display: flex;
  align-items: center;
  cursor: grab;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  white-space: nowrap;
  overflow: hidden;
  user-select: none;
}
.gantt-bar:active { cursor: grabbing; }
.gantt-bar.conflict { background: var(--danger); }
.gantt-bar.frozen { background: var(--steel); }
.gantt-bar.completed { background: var(--success); }

/* Utility */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-warning { color: #a16207; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.ml-auto { margin-left: auto; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.empty-state {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 12px; opacity: .5; }

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
}
.page-btn {
  padding: 5px 10px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 4px;
  cursor: pointer;
}
.page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-btn:disabled { opacity: .5; cursor: not-allowed; }