```
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #666666;
  --accent: #6366f1;
  --accent-hover: #7c7dff;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --border: #333333;
  --shadow: rgba(0, 0, 0, 0.3);
  --nsfw: #ff4757;
  --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #ec4899);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

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

.sidebar {
  width: 320px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width 0.3s ease;
}

.sidebar.collapsed {
  width: 60px;
}

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

.sidebar-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.2s;
}

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

.search-container, .create-section {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.create-btn {
  width: 100%;
  padding: 12px;
  background: var(--gradient);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.create-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.character-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px 12px;
}

.category-section {
  margin-bottom: 16px;
}

.category-header {
  padding: 12px 8px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.category-count {
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
}

.character-item {
  display: flex;
  align-items: center;
  padding: 12px;
  margin: 4px 0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.character-item:hover {
  background: var(--bg-tertiary);
}

.character-item.active {
  background: var(--accent-glow);
  border-left: 3px solid var(--accent);
}

.character-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  font-size: 1.2rem;
}

.character-info {
  flex: 1;
}

.character-info h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
}

.nsfw-tag {
  background: var(--nsfw);
  color: white;
  font-size: 0.6rem;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 6px;
}

.character-info p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.character-stats {
  display: flex;
  gap: 12px;
  margin-top: 4px;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.chat-header {
  padding: 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}

.back-button {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.2s;
}

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

.character-info h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.character-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.clear-chat {
  margin-left: auto;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: 12px;
  word-wrap: break-word;
  line-height: 1.5;
}

.message.user {
  margin-left: auto;
  background: var(--gradient);
  color: white;
  border-bottom-right-radius: 4px;
}

.message.assistant {
  margin-right: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 8px 0;
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--text-secondary);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-10px); }
}

.input-container {
  padding: 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.message-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 24px;
  color: var(--text-primary);
  resize: none;
  min-height: 48px;
  max-height: 120px;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.5;
}

.message-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.send-button {
  padding: 12px 24px;
  background: var(--gradient);
  color: white;
  border: none;
  border-radius: 24px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.send-button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.send-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.welcome-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 40px;
}

.welcome-content {
  text-align: center;
  max-width: 600px;
}

.welcome-content h1 {
  font-size: 3rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

.welcome-content p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.feature {
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.feature h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.feature p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.get-started {
  padding: 16px 32px;
  background: var(--gradient);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.get-started:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--accent-glow);
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-content h2 {
  font-size: 1.8rem;
  margin-bottom: 24px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.templates {
  margin-bottom: 32px;
}

.templates h3 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.template-card {
  padding: 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.template-card:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

.template-card h4 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--accent);
}

.template-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.checkbox label {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.checkbox input {
  width: auto;
  margin-right: 8px;
}

.nsfw-checkbox {
  color: var(--nsfw);
  font-weight: 600;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 32px;
}

.btn-primary,
.btn-secondary {
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--gradient);
  color: white;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

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

.btn-secondary:hover {
  background: var(--bg-tertiary);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Responsive design */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    position: absolute;
    z-index: 100;
  }

  .sidebar:not(.collapsed) {
    transform: translateX(0);
  }

  .welcome-content h1 {
    font-size: 2rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }
}