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

:root {
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-chat: #0a0a1a;
  --accent: #6c63ff;
  --accent-hover: #5a52d5;
  --accent-light: rgba(108, 99, 255, 0.15);
  --text-primary: #e8e8e8;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --border: #2a2a4a;
  --success: #4caf50;
  --error: #ff5252;
  --user-bubble: #6c63ff;
  --ai-bubble: #1e1e3a;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

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

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

/* Sidebar */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, #6c63ff, #e91e63);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.sidebar-header p {
  font-size: 12px;
  color: var(--text-muted);
}

.new-chat-btn {
  margin: 16px 20px;
  padding: 12px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.new-chat-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108, 99, 255, 0.3);
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}

.chat-list::-webkit-scrollbar {
  width: 4px;
}

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

.chat-item {
  padding: 12px 16px;
  border-radius: 10px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-item:hover {
  background: var(--accent-light);
}

.chat-item.active {
  background: var(--accent-light);
  border: 1px solid rgba(108, 99, 255, 0.3);
}

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

.chat-item-title {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item-date {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.chat-item-delete {
  opacity: 0;
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  padding: 4px;
  font-size: 16px;
  transition: opacity 0.2s;
}

.chat-item:hover .chat-item-delete {
  opacity: 1;
}

/* Main Chat Area */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-chat);
}

.chat-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
}

.chat-title {
  font-size: 16px;
  font-weight: 600;
}

.size-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}

.size-selector label {
  font-size: 12px;
  color: var(--text-secondary);
}

.size-selector select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
}

/* Messages */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.messages-container::-webkit-scrollbar {
  width: 6px;
}

.messages-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 6px;
}

.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
}

.welcome-icon {
  font-size: 64px;
  margin-bottom: 8px;
}

.welcome-screen h2 {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, #6c63ff, #e91e63);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-screen p {
  color: var(--text-secondary);
  max-width: 400px;
  line-height: 1.6;
}

.quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  justify-content: center;
}

.quick-action-btn {
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.quick-action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* Message Bubbles */
.message {
  display: flex;
  gap: 12px;
  max-width: 85%;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: var(--accent);
}

.message.assistant .message-avatar {
  background: linear-gradient(135deg, #e91e63, #6c63ff);
}

.message-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  line-height: 1.6;
  font-size: 14px;
  word-wrap: break-word;
}

.message.user .message-bubble {
  background: var(--user-bubble);
  border-bottom-right-radius: 4px;
}

.message.assistant .message-bubble {
  background: var(--ai-bubble);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message-image {
  max-width: 400px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.message-image img {
  width: 100%;
  display: block;
  cursor: pointer;
  transition: transform 0.2s;
}

.message-image img:hover {
  transform: scale(1.02);
}

.message-image-label {
  padding: 6px 12px;
  background: var(--bg-secondary);
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.download-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}

.download-btn:hover {
  background: var(--accent-light);
}

/* Loading */
.loading-dots {
  display: flex;
  gap: 4px;
  padding: 8px 0;
}

.loading-dots span {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* Input Area */
.input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.image-preview-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.image-preview-item {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid var(--border);
  animation: fadeIn 0.2s ease;
}

.image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-preview-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  background: rgba(0, 0, 0, 0.7);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.input-wrapper {
  flex: 1;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px 12px;
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: var(--accent);
}

.upload-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  font-size: 20px;
  border-radius: 8px;
  transition: all 0.2s;
  flex-shrink: 0;
}

.upload-btn:hover {
  color: var(--accent);
  background: var(--accent-light);
}

#prompt-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 120px;
  line-height: 1.5;
}

#prompt-input::placeholder {
  color: var(--text-muted);
}

.send-btn {
  width: 44px;
  height: 44px;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  color: white;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.send-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.send-btn:disabled {
  background: var(--border);
  cursor: not-allowed;
  transform: none;
}

/* Hidden file input */
#file-input {
  display: none;
}

/* Drop zone overlay */
.drop-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(108, 99, 255, 0.1);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.drop-overlay.active {
  display: flex;
}

.drop-overlay-content {
  background: var(--bg-secondary);
  border: 3px dashed var(--accent);
  border-radius: 24px;
  padding: 60px;
  text-align: center;
}

.drop-overlay-content .icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.drop-overlay-content p {
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 600;
}

/* Image lightbox */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 8px;
}

/* Settings modal */
.settings-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1500;
  align-items: center;
  justify-content: center;
}

.settings-overlay.active {
  display: flex;
}

.settings-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  width: 480px;
  max-width: 90%;
}

.settings-modal h3 {
  font-size: 18px;
  margin-bottom: 20px;
}

.settings-field {
  margin-bottom: 16px;
}

.settings-field label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.settings-field input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: monospace;
}

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

.settings-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

.settings-actions button {
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  border: none;
}

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

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

/* Sidebar settings button */
.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.settings-btn {
  width: 100%;
  padding: 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
}

.settings-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-toggle {
    display: block;
  }

  .message {
    max-width: 95%;
  }

  .messages-container {
    padding: 16px;
  }

  .input-area {
    padding: 12px 16px;
  }

  .message-image {
    max-width: 280px;
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }

  .sidebar-backdrop.active {
    display: block;
  }
}

/* Error message */
.error-bubble {
  background: rgba(255, 82, 82, 0.1) !important;
  border-color: rgba(255, 82, 82, 0.3) !important;
  color: var(--error) !important;
}