:root {
  /* Dark theme (default) */
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #252525;
  --bg-hover: #2f2f2f;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-tertiary: #666666;
  --border-color: #333333;
  --accent-color: #6366f1;
  --accent-hover: #5558e3;
  --accent-light: rgba(99, 102, 241, 0.1);
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --code-bg: #1e1e1e;
  --scrollbar-thumb: #3a3a3a;
  --scrollbar-track: transparent;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-hover: #dee2e6;
  --text-primary: #1a1a1a;
  --text-secondary: #495057;
  --text-tertiary: #6c757d;
  --border-color: #dee2e6;
  --accent-color: #6366f1;
  --accent-hover: #5558e3;
  --accent-light: rgba(99, 102, 241, 0.1);
  --code-bg: #f5f5f5;
  --scrollbar-thumb: #c1c1c1;
  --scrollbar-track: #f1f1f1;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

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

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

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

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

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

/* App Container */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 28px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-color) 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.new-chat-btn {
  margin: 16px 20px;
  width: calc(100% - 40px);
}

.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent-color) 0%, #8b5cf6 100%);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.sidebar-section {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

/* Mode Selector */
.mode-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mode-btn {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.mode-btn:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-color);
}

.mode-btn.active {
  background-color: var(--accent-light);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.mode-btn-icon {
  font-size: 20px;
  display: block;
  margin-bottom: 4px;
}

.mode-btn-name {
  font-size: 12px;
  font-weight: 600;
}

/* Model Select */
.model-select {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.model-select:hover {
  border-color: var(--accent-color);
}

.model-select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* API Key Section */
.api-key-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.api-key-section label {
  font-size: 13px;
  color: var(--text-secondary);
}

.api-key-input-wrapper {
  display: flex;
  gap: 8px;
}

.api-key-input-wrapper input {
  flex: 1;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
}

.api-key-input-wrapper input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.save-api-btn {
  width: 100%;
}

/* Chat History */
.chat-history {
  flex: 1;
  overflow-y: auto;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.history-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.history-item:hover {
  background-color: var(--bg-hover);
}

.history-item.active {
  background-color: var(--accent-light);
  color: var(--text-primary);
}

.history-item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

.history-item-delete {
  opacity: 0;
  transition: opacity 0.2s ease;
}

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

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
  display: block;
}

.glm-link {
  font-size: 12px;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.glm-link:hover {
  color: var(--accent-color);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  overflow: hidden;
}

/* Chat Header */
.chat-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-info h1 {
  font-size: 18px;
  font-weight: 600;
}

.mode-badge {
  background-color: var(--accent-light);
  color: var(--accent-color);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

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

/* Welcome Screen */
.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
}

.welcome-icon {
  font-size: 64px;
  margin-bottom: 20px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.welcome-screen h2 {
  font-size: 28px;
  margin-bottom: 8px;
}

.welcome-screen > p {
  color: var(--text-secondary);
  margin-bottom: 40px;
}

/* Feature Cards */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin-bottom: 40px;
  width: 100%;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
}

.feature-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 32px;
  display: block;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Quick Prompts */
.quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 800px;
}

.quick-prompt-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 10px 20px;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* Chat Container */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.messages-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Message */
.message {
  display: flex;
  gap: 16px;
  animation: fadeIn 0.3s ease;
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  background-color: var(--bg-tertiary);
}

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

.message.assistant .message-avatar {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.message-sender {
  font-weight: 600;
  font-size: 14px;
}

.message-time {
  font-size: 12px;
  color: var(--text-tertiary);
}

.message-text {
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.7;
  word-wrap: break-word;
}

.message-text pre {
  background-color: var(--code-bg);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--border-color);
}

.message-text code {
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
  font-size: 13px;
}

.message-text p code {
  background-color: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
}

.message-text ul, .message-text ol {
  margin: 12px 0;
  padding-left: 24px;
}

.message-text li {
  margin: 8px 0;
}

.message-text a {
  color: var(--accent-color);
  text-decoration: none;
}

.message-text a:hover {
  text-decoration: underline;
}

.message-text h1, .message-text h2, .message-text h3, .message-text h4 {
  margin: 20px 0 12px 0;
}

.message-text blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 16px;
  margin: 16px 0;
  color: var(--text-secondary);
}

/* Input Container */
.input-container {
  padding: 16px 24px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 8px 12px;
  transition: all 0.2s ease;
}

.input-wrapper:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input-wrapper textarea {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 15px;
  resize: none;
  max-height: 200px;
  line-height: 1.5;
  padding: 8px 0;
}

.input-wrapper textarea:focus {
  outline: none;
}

.input-wrapper textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.input-wrapper textarea::placeholder {
  color: var(--text-tertiary);
}

.send-btn {
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.send-btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: scale(1.05);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.input-hint {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 900px;
  margin: 8px auto 0;
  font-size: 12px;
  color: var(--text-tertiary);
}

.api-status {
  display: flex;
  align-items: center;
  gap: 6px;
}

.api-status-configured {
  color: var(--success-color);
}

.api-status-not-configured {
  color: var(--warning-color);
}

/* Code Block Header */
.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 8px 8px 0 0;
  margin-bottom: -16px;
}

.code-language {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
}

.copy-code-btn {
  background-color: var(--bg-hover);
  border: none;
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

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

/* Loading Animation */
.typing-indicator {
  display: flex;
  gap: 6px;
  padding: 8px 0;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background-color: var(--text-tertiary);
  border-radius: 50%;
  animation: bounce 1.4s infinite;
}

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

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

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

/* Mobile Styles */
.mobile-only {
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

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

  .mobile-only {
    display: flex;
  }

  .feature-cards {
    grid-template-columns: 1fr;
  }

  .quick-prompts {
    flex-direction: column;
  }

  .quick-prompt-btn {
    width: 100%;
    text-align: left;
  }
}

/* Overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 99;
}

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