/* CSS Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Colors */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #e0e7ff;
  --secondary: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* Neutrals */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Spacing */
  --sidebar-width: 240px;
  --panel-width: 420px;
  --header-height: 64px;

  /* Transitions */
  --transition: 150ms ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* App Layout */
.app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--text-primary);
  color: white;
  position: fixed;
  height: 100vh;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-header {
  padding: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: white;
}

.nav-links {
  list-style: none;
  padding: 12px;
  flex: 1;
}

.nav-links li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  font-weight: 500;
  font-size: 0.9rem;
}

.nav-links li:hover {
  background: rgba(255,255,255,0.1);
  color: white;
}

.nav-links li.active {
  background: var(--primary);
  color: white;
}

.nav-links li svg {
  flex-shrink: 0;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-left h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.badge {
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

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

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

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  border-color: var(--border-hover);
}

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

.btn-success:hover {
  background: #059669;
}

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-icon {
  padding: 8px;
}

/* Content Area */
.content {
  padding: 24px;
  flex: 1;
}

.content.hidden {
  display: none;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.search-input,
.filter-select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  background: var(--bg-secondary);
  transition: var(--transition);
}

.search-input {
  flex: 1;
  max-width: 320px;
}

.search-input:focus,
.filter-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

/* Assessment Card */
.assessment-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  transition: var(--transition);
}

.assessment-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  flex: 1;
  margin-right: 12px;
}

.stage-badge {
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.stage-1 { background: #fef3c7; color: #92400e; }
.stage-2 { background: #dbeafe; color: #1e40af; }
.stage-3 { background: #e0e7ff; color: #3730a3; }
.stage-4 { background: #d1fae5; color: #065f46; }
.stage-5 { background: #dcfce7; color: #166534; }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.meta-item svg {
  color: var(--text-muted);
}

.card-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.poc-info {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-actions {
  display: flex;
  gap: 8px;
}

/* Detail Panel */
.detail-panel {
  position: fixed;
  right: 0;
  top: 0;
  width: var(--panel-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.detail-panel.visible {
  transform: translateX(0);
}

.detail-panel.hidden {
  display: flex;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.panel-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: 6px;
  transition: var(--transition);
}

.close-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

/* Panel Sections */
.panel-section {
  margin-bottom: 24px;
}

.panel-section h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.panel-section p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.info-item {
  font-size: 0.85rem;
}

.info-item .label {
  color: var(--text-muted);
  margin-bottom: 4px;
}

.info-item .value {
  color: var(--text-primary);
  font-weight: 500;
}

.panel-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
  color: var(--text-muted);
}

.empty-state svg {
  margin-bottom: 24px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 320px;
}

/* Settings */
.settings-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  max-width: 600px;
}

.settings-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.setting-item {
  margin-bottom: 16px;
}

.setting-item label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.setting-item input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
}

.setting-item input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  padding: 24px;
}

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

.modal {
  background: var(--bg-secondary);
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-content {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 400;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background: var(--text-primary);
  color: white;
  padding: 14px 20px;
  border-radius: 10px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: slideIn 0.3s ease;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }
.toast.info { background: var(--info); }

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Textarea in modals */
.modal textarea {
  width: 100%;
  min-height: 200px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 0.85rem;
  resize: vertical;
  line-height: 1.5;
}

.modal textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Loading State */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Links in panel */
.panel-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.panel-link:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    width: 64px;
  }

  .sidebar-header h1 {
    display: none;
  }

  .nav-links li span {
    display: none;
  }

  .main-content {
    margin-left: 64px;
  }
}

@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .detail-panel {
    width: 100%;
  }

  .filter-bar {
    flex-direction: column;
  }

  .search-input {
    max-width: 100%;
  }
}