:root {
  --primary: #6e45e2;
  --primary-dark: #5a36cc;
  --secondary: #88d3ce;
  --accent: #ff6b6b;
  --text-primary: #1a1a1a;
  --text-secondary: #4a5568;
  --text-tertiary: #718096;
  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f8;
  --bg-tertiary: #ececf1;
  --border: #e2e8f0;
  --user-message-bg: #f0f4ff;
  --ai-message-bg: #ffffff;
  --sidebar-bg: #2d3748;
  --sidebar-text: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: all 0.2s ease;
}

[data-theme="dark"] {
  --primary: #7c5cff;
  --primary-dark: #6a4beb;
  --text-primary: #f7fafc;
  --text-secondary: #cbd5e0;
  --text-tertiary: #a0aec0;
  --bg-primary: #1a202c;
  --bg-secondary: #2d3748;
  --bg-tertiary: #4a5568;
  --border: #4a5568;
  --user-message-bg: #2d3748;
  --ai-message-bg: #2d3748;
  --sidebar-bg: #1a202c;
}

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

html {
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
}

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

/* Боковая панель */
.sidebar {
  width: 280px;
  background-color: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  position: absolute;
  height: 100%;
  z-index: 100;
  transform: translateX(-100%);
}

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

.sidebar-header {
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.new-chat-btn {
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.new-chat-btn:hover {
  background-color: var(--primary-dark);
}

.close-sidebar {
  background: none;
  border: none;
  color: var(--sidebar-text);
  cursor: pointer;
  font-size: 1rem;
  display: none;
}

.chat-history {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.chat-item {
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: var(--transition);
}

.chat-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-btn {
  background: none;
  border: none;
  color: var(--sidebar-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.settings-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Основной контент */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.app-header {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 10;
}

.menu-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.25rem;
  margin-right: 0.75rem;
  padding: 0.25rem;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.logo h1 {
  font-size: 1.125rem;
  font-weight: 600;
}

.logo span {
  color: var(--primary);
  font-weight: 700;
}

.header-actions {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.1rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
}

/* Контейнер чата */
.chat-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  scroll-behavior: smooth;
}

.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  padding: 2rem;
}

.welcome-logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.welcome-screen h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.welcome-screen p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.quick-questions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 500px;
  width: 100%;
}

.quick-question {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-primary);
}

.quick-question:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--primary);
}

/* Сообщения */
.message {
  max-width: 800px;
  margin: 0 auto 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  position: relative;
  box-shadow: var(--shadow-sm);
  line-height: 1.6;
  animation: fadeIn 0.3s ease;
}

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

.user-message {
  background-color: var(--user-message-bg);
  margin-left: auto;
  border-bottom-right-radius: var(--radius-sm);
}

.ai-message {
  background-color: var(--ai-message-bg);
  margin-right: auto;
  border-bottom-left-radius: var(--radius-sm);
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  position: absolute;
  top: -16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  color: white;
}

.user-avatar {
  right: -16px;
  background: linear-gradient(135deg, #4f6af5, var(--primary));
}

.ai-avatar {
  left: -16px;
  background: linear-gradient(135deg, #10b981, #06b6d4);
}

.message-content {
  white-space: pre-wrap;
}

.message-content code {
  font-family: 'JetBrains Mono', monospace;
  background-color: var(--bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

.message-content pre {
  background-color: var(--bg-tertiary);
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 0.5rem 0;
}

.message-content pre code {
  background: none;
  padding: 0;
}

.message-time {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 0.5rem;
  text-align: right;
}

.typing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.75rem 1.25rem;
  background-color: var(--ai-message-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  margin-left: 48px;
  animation: fadeIn 0.3s ease;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background-color: var(--text-secondary);
  border-radius: 50%;
  animation: typingAnimation 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) {
  animation-delay: 0s;
}

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

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

@keyframes typingAnimation {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  30% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

/* Поле ввода */
.chat-input-container {
  padding: 1rem;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border);
  position: sticky;
  bottom: 0;
}

.input-wrapper {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 4rem 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.9375rem;
  resize: none;
  min-height: 50px;
  max-height: 200px;
  outline: none;
  transition: var(--transition);
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(110, 69, 226, 0.1);
}

.input-actions {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  display: flex;
  gap: 0.5rem;
}

.attach-btn, .send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.attach-btn {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

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

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

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

.send-btn:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: not-allowed;
  transform: none;
}

.input-footer {
  max-width: 800px;
  margin: 0.5rem auto 0;
  text-align: center;
}

.input-footer p {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* Модальное окно */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal.active .modal-content {
  transform: translateY(0);
}

.modal h3 {
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
}

.settings-option {
  margin-bottom: 1rem;
}

.settings-option label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.settings-option select, .settings-option input[type="range"] {
  width: 100%;
}

.close-modal {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.25rem;
}

/* Адаптивность */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    width: 280px;
    z-index: 1000;
  }

  .close-sidebar {
    display: block;
  }

  .message {
    max-width: 90%;
  }

  .welcome-screen h2 {
    font-size: 1.5rem;
  }

  .welcome-screen p {
    font-size: 0.9375rem;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: 0.5rem;
  }

  .logo h1 {
    font-size: 1rem;
  }

  .chat-messages {
    padding: 0.75rem;
  }

  .message {
    padding: 0.75rem;
    margin-bottom: 1rem;
  }

  .chat-input-container {
    padding: 0.75rem;
  }

  textarea {
    padding: 0.75rem 3.5rem 0.75rem 0.75rem;
  }
}