:root {
  /* Colors - Dark Theme */
  --bg-body: #0B0F19;     /* Very dark blue/black */
  --bg-card: #111827;     /* Dark gray/blue for cards */
  --bg-sidebar: #111827;  /* Same as card */
  --bg-hover: #1F2937;    /* Lighter for hover states */
  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-light: #6B7280;
  
  --primary: #6366F1;
  --primary-light: #818CF8;
  --primary-gradient: linear-gradient(135deg, #6366F1 0%, #818CF8 100%);
  --primary-shadow: rgba(99, 102, 241, 0.4);
  
  --success: #34D399;
  --success-bg: rgba(16, 185, 129, 0.2);
  --warning: #FBBF24;
  --warning-bg: rgba(245, 158, 11, 0.2);
  --danger: #F87171;
  --danger-bg: rgba(239, 68, 68, 0.2);
  --info: #60A5FA;
  --info-bg: rgba(59, 130, 246, 0.2);
  
  --border-color: #374151;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Shadows */
  --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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  margin: 0;
  min-height: 100vh;
  display: flex;
}

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

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-header {
  padding: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.brand-logo {
  width: 32px;
  height: 32px;
  background: var(--primary-gradient);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-menu {
  list-style: none;
  padding: var(--spacing-md);
  margin: 0;
  flex: 1;
}

.nav-item {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  background-color: var(--bg-hover);
  color: var(--primary);
}

.nav-link.active {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 12px var(--primary-shadow);
}

.nav-icon {
  width: 20px;
  height: 20px;
  margin-right: var(--spacing-md);
  /* Placeholder for icons */
  background-color: currentColor;
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
  opacity: 0.8;
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--spacing-xl);
  overflow-y: auto;
  max-width: 100%;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.avatar {
  width: 40px;
  height: 40px;
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* Cards & Grid */
.grid-cols-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.grid-cols-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

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

.stat-card {
  display: flex;
  flex-direction: column;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-change {
  display: inline-flex;
  align-items: center;
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

.change-up { color: var(--success); }
.change-down { color: var(--danger); }

/* Tables */
.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th {
  padding: var(--spacing-md);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-hover);
}

.table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.table tr:last-child td {
  border-bottom: none;
}

.candidate-info {
  display: flex;
  flex-direction: column;
}

.candidate-name { font-weight: 600; color: var(--text-primary); }
.candidate-email { font-size: 0.75rem; color: var(--text-secondary); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background-color: var(--success-bg); color: var(--success); }
.badge-warning { background-color: var(--warning-bg); color: var(--warning); }
.badge-danger { background-color: var(--danger-bg); color: var(--danger); }
.badge-info { background-color: var(--info-bg); color: var(--info); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 14px var(--primary-shadow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--primary-shadow);
}

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

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

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

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  transition: all 0.2s;
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-icon.btn-success:hover {
  color: var(--success);
  border-color: var(--success);
  background-color: var(--success-bg);
}

.btn-icon.btn-danger:hover {
  color: var(--danger);
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

.action-buttons {
  display: flex;
  gap: 0.5rem;
}

/* Chat Layout */
.chat-layout {
  display: flex;
  height: calc(100vh - 140px);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.chat-sidebar {
  width: 320px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.chat-search {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.chat-list {
  flex: 1;
  overflow-y: auto;
}

.chat-item {
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  transition: background 0.2s;
  border-bottom: 1px solid var(--border-color);
}

.chat-item:hover, .chat-item.active {
  background-color: var(--bg-hover);
}

.chat-item-info {
  flex: 1;
  min-width: 0;
}

.chat-name {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 2px;
}

.chat-preview {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.chat-window {
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.chat-messages {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background-color: var(--bg-body);
}

.message {
  max-width: 70%;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
}

.message-in {
  background: var(--bg-card);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border-color);
}

.message-out {
  background: var(--primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-input-area {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  display: flex;
  gap: var(--spacing-sm);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

/* Charts (CSS only representation) */
.chart-container {
  height: 200px;
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  padding-top: var(--spacing-xl);
}

.chart-bar {
  width: 12%;
  background-color: var(--primary-light);
  border-radius: 4px 4px 0 0;
  position: relative;
  transition: height 0.5s ease;
  opacity: 0.8;
}

.chart-bar:hover {
  opacity: 1;
  background-color: var(--primary);
}

.chart-bar:after {
  content: attr(data-label);
  position: absolute;
  bottom: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.funnel-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.funnel-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.funnel-label {
  width: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.funnel-bar-bg {
  flex: 1;
  height: 24px;
  background-color: var(--bg-hover);
  border-radius: 4px;
  overflow: hidden;
}

.funnel-bar-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 4px;
}

.funnel-value {
  width: 40px;
  font-weight: 600;
  font-size: 0.875rem;
}

/* Helper Text */
.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--text-secondary); }
.font-bold { font-weight: 700; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    width: 80px;
  }
  .nav-link span {
    display: none;
  }
  .nav-icon {
    margin-right: 0;
  }
  .brand-name {
    display: none;
  }
  .sidebar-header {
    justify-content: center;
    padding: var(--spacing-md);
  }
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    flex-direction: row;
    position: relative;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-menu {
    display: flex;
    flex-direction: row;
  }
  .nav-link span {
    display: none;
  }
  .nav-item {
    margin-bottom: 0;
    margin-right: var(--spacing-sm);
  }
  .sidebar-footer {
    display: none;
  }
}

/* Desktop Optimization (1200px+) */
@media (min-width: 1200px) {
  /* Enhanced Sidebar */
  .sidebar {
    width: 300px;
  }
  
  .nav-link {
    font-size: 1rem; /* Slightly larger text */
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Spacious Main Content */
  .main-content {
    padding: 3rem; /* More breathing room */
    max-width: 1800px; /* Prevent it from getting too wide on ultrawide monitors */
    margin: 0 auto; /* Center content on ultrawide */
  }

  /* Typography Scaling */
  .page-title {
    font-size: 2.25rem;
    margin-bottom: 2.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .stat-value {
    font-size: 2.5rem;
  }

  /* Grid Optimization */
  /* For cards that were 2 columns, try 3 on large screens if they fit */
  .grid-cols-2 {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  /* Ensure stats row stays expansive but consistent */
  .grid-cols-4 {
    gap: 2rem;
  }

  /* Card Spacing */
  .card {
    padding: 2rem; /* Larger internal padding */
  }

  /* Better Form Layouts for wide screens */
  .form-group {
    max-width: 80%; /* Don't let inputs stretch infinitely */
  }
  
  /* Chat Optimization */
  .chat-layout {
    height: calc(100vh - 180px); /* Adjust for taller header area */
  }
  
  .chat-sidebar {
    width: 380px; /* Wider chat sidebar */
  }

  /* Table readability */
  .table th, .table td {
    padding: 1.25rem;
    font-size: 1rem;
  }
}

/* Ultrawide screens (1600px+) */
@media (min-width: 1600px) {
  .grid-cols-2 {
    grid-template-columns: repeat(4, 1fr); /* 4 columns for interview requests etc */
  }
  
  .sidebar {
    width: 320px;
  }
}