:root {
  --primary-color: #7c3aed; /* Purple */
  --primary-hover: #6d28d9;
  --bg-color: #f3f4f6; /* Light gray background */
  --bg-surface: #ffffff; /* White surface */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --success-color: #10b981;
  --error-color: #ef4444;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  font-size: 14px;
}

.app-container {
  display: flex;
  height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.group-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}

.group-item {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s;
}

.group-item:hover {
  background-color: #f9fafb;
}

.group-item label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
}

.group-info {
  flex: 1;
}

.group-name {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.group-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Top Nav */
.top-nav {
  height: 60px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Content Area */
.content-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

/* Panels */
.panel {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.panel-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-body {
  padding: 1.5rem;
  flex: 1;
  overflow: hidden; /* For inner scrolling */
}

/* Forms */
.input-group {
  margin-bottom: 1rem;
}

.input-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-field, .select-field, .textarea-field {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-size: 0.875rem;
}

.input-field:focus, .select-field:focus, .textarea-field:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.textarea-field {
  min-height: 120px;
  resize: vertical;
}

.row-inputs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: white;
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #f9fafb;
  border-color: #d1d5db;
}

.btn-danger {
  background-color: var(--error-color);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Tables */
.table-container {
  overflow: auto;
  height: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 0.75rem 1rem;
  background-color: #f9fafb;
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--text-secondary);
  position: sticky;
  top: 0;
  z-index: 10;
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

/* Utilities */
.text-sm { font-size: 0.75rem; }
.text-muted { color: var(--text-muted); }
.hidden { display: none !important; }
.d-none { display: none !important; }
.flex-col { display: flex; flex-direction: column; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.flex-1 { flex: 1; }
.mt-4 { margin-top: 1rem; }
.text-center { text-align: center; }

/* Status Colors */
.status-success { color: var(--success-color); }
.status-error { color: var(--error-color); }
.status-warn { color: #f59e0b; }

/* Popover */
.login-popover {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  width: 320px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  z-index: 50;
  display: none;
}

.login-popover.active {
  display: block;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
}

.modal:not(.hidden) {
  display: flex;
}

.modal-content {
  background-color: var(--bg-surface);
  margin: auto;
  padding: 0;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  width: 600px;
  max-width: 90%;
  animation: modalSlideIn 0.3s ease-out;
  display: flex;
  flex-direction: column;
  max-height: 90vh;
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}