:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --bg-input: #1e2a4a;
  --accent: #4CAF50;
  --accent-hover: #45a049;
  --accent2: #2196F3;
  --danger: #e74c3c;
  --warning: #f39c12;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --border: #2a3a5c;
  --shadow: rgba(0,0,0,0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Header */
.app-header {
  background: var(--bg-secondary);
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 56px;
  border-bottom: 2px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 20px;
}

.app-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  white-space: nowrap;
}

.app-logo span { color: var(--text-primary); }

/* Tabs */
.tab-nav {
  display: flex;
  gap: 4px;
  flex: 1;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tab-btn:hover { background: var(--bg-input); color: var(--text-primary); }
.tab-btn.active { background: var(--accent); color: #fff; }

/* Main layout */
.app-main {
  padding: 20px;
  max-width: 1800px;
  margin: 0 auto;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Gantt */
#gantt-container {
  background: var(--bg-secondary);
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.gantt-toolbar {
  padding: 12px 16px;
  display: flex;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

#timeline {
  height: calc(100vh - 200px);
  min-height: 500px;
}

/* vis-timeline dark overrides */
.vis-timeline { background: var(--bg-secondary) !important; border: none !important; }
.vis-panel.vis-center, .vis-panel.vis-left { background: var(--bg-secondary) !important; }
.vis-time-axis .vis-text { color: var(--text-secondary) !important; }
.vis-time-axis .vis-grid.vis-minor { border-color: var(--border) !important; }
.vis-time-axis .vis-grid.vis-major { border-color: #3a4a6c !important; }
.vis-label { color: var(--text-primary) !important; background: var(--bg-card) !important; border-bottom: 1px solid var(--border) !important; }
.vis-label .vis-inner { padding: 4px 8px !important; font-size: 0.82rem !important; }
.vis-foreground .vis-group { border-bottom: 1px solid var(--border) !important; }
.vis-item { border-radius: 4px !important; font-size: 0.78rem !important; }
.vis-item.vis-selected { border-color: #fff !important; }
.vis-current-time { background-color: #e74c3c !important; width: 2px !important; }
.vis-panel.vis-top { background: var(--bg-card) !important; }

/* Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--accent);
}

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* Employee cards */
.employee-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }

.employee-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  position: relative;
}

.employee-card.overloaded { border-color: var(--danger); }

.employee-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.employee-role {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.load-bar-container {
  background: var(--bg-input);
  border-radius: 4px;
  height: 8px;
  margin-bottom: 6px;
  overflow: hidden;
}

.load-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s;
}

.load-bar.ok { background: var(--accent); }
.load-bar.warn { background: var(--warning); }
.load-bar.over { background: var(--danger); }

.load-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.overload-badge {
  display: inline-block;
  background: var(--danger);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 10px;
  margin-left: 8px;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c0392b; }
.btn-blue { background: var(--accent2); color: #fff; }
.btn-blue:hover { background: #1a86d8; }
.btn-sm { padding: 5px 10px; font-size: 0.8rem; }
.btn-icon { padding: 6px; border-radius: 4px; }

/* Forms */
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 6px; }
.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-textarea { min-height: 80px; resize: vertical; }
.form-select option { background: var(--bg-secondary); }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-overlay.hidden { display: none; }

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--accent);
}

.modal-footer {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
}

/* Context menu */
.context-menu {
  position: fixed;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  z-index: 2000;
  min-width: 160px;
  box-shadow: 0 8px 24px var(--shadow);
}

.context-menu.hidden { display: none; }

.ctx-item {
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s;
}

.ctx-item:hover { background: var(--bg-input); }
.ctx-item.danger { color: var(--danger); }

/* AI Chat */
.ai-container {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 16px;
  height: calc(100vh - 160px);
}

.chat-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.chat-msg.user { background: var(--accent); color: #fff; align-self: flex-end; border-radius: 10px 10px 2px 10px; }
.chat-msg.assistant { background: var(--bg-card); color: var(--text-primary); align-self: flex-start; border-radius: 10px 10px 10px 2px; }
.chat-msg.system { background: var(--bg-input); color: var(--text-secondary); align-self: center; font-size: 0.82rem; border-radius: 6px; max-width: 100%; text-align: center; }

.chat-input-bar {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
}

.chat-input-bar input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
}

.chat-input-bar input:focus { outline: none; border-color: var(--accent); }

/* AI Sidebar */
.ai-sidebar {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  overflow-y: auto;
}

.ai-sidebar .card-title { font-size: 0.95rem; }

/* Warnings */
.warning-list { display: flex; flex-direction: column; gap: 10px; }

.warning-item {
  padding: 12px 16px;
  border-radius: 8px;
  border-left: 4px solid;
  font-size: 0.88rem;
  line-height: 1.5;
}

.warning-item.red { background: rgba(231,76,60,0.12); border-color: var(--danger); }
.warning-item.yellow { background: rgba(243,156,18,0.12); border-color: var(--warning); }
.warning-item.grey { background: rgba(160,160,176,0.08); border-color: var(--text-secondary); }

.warning-title { font-weight: 600; margin-bottom: 4px; }
.warning-detail { color: var(--text-secondary); font-size: 0.82rem; }

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.stat-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-chip .num { font-size: 1.2rem; font-weight: 700; color: var(--accent); }

/* Color dot */
.color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* Spinner */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Percent progress */
.progress-bar-wrap { background: var(--bg-input); border-radius: 4px; height: 6px; margin-top: 4px; }
.progress-bar-fill { height: 100%; border-radius: 4px; background: var(--accent); transition: width 0.3s; }

/* Tooltip */
.vis-tooltip { background: var(--bg-card) !important; color: var(--text-primary) !important; border: 1px solid var(--border) !important; border-radius: 6px !important; font-size: 0.82rem !important; padding: 8px 10px !important; }

@media (max-width: 768px) {
  .ai-container { grid-template-columns: 1fr; }
  .app-main { padding: 10px; }
}