/* CSS Variables for theming */
:root {
  /* Arch Linux Colors */
  --arch-blue: #1793d1;
  --arch-blue-dark: #0d5f8a;
  --arch-blue-light: #4fb3e8;
  
  /* Animation */
  --transition-speed: 0.2s;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --bg-primary: #0d0d0d;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #252525;
  --bg-hover: #2a2a2a;
  --text-primary: #e5e5e5;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --border-color: #333333;
  --accent: var(--arch-blue);
  --accent-hover: var(--arch-blue-light);
  --user-bubble: #1793d1;
  --user-bubble-text: #ffffff;
  --assistant-bubble: #1a1a1a;
  --assistant-bubble-text: #e5e5e5;
  --code-bg: #0d0d0d;
  --scrollbar-thumb: #444444;
  --scrollbar-track: #1a1a1a;
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #ebebeb;
  --bg-hover: #e0e0e0;
  --text-primary: #1a1a1a;
  --text-secondary: #555555;
  --text-muted: #888888;
  --border-color: #dddddd;
  --accent: var(--arch-blue);
  --accent-hover: var(--arch-blue-dark);
  --user-bubble: #1793d1;
  --user-bubble-text: #ffffff;
  --assistant-bubble: #f0f0f0;
  --assistant-bubble-text: #1a1a1a;
  --code-bg: #f5f5f5;
  --scrollbar-thumb: #cccccc;
  --scrollbar-track: #f0f0f0;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 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-muted);
}

/* App Layout */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 900px;
  margin: 0 auto;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

.arch-logo {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-speed);
}

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

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

[data-theme="dark"] .moon-icon {
  display: none;
}

[data-theme="light"] .sun-icon {
  display: none;
}

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

/* Chat Container */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

/* Welcome Message */
.welcome-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1rem;
  flex: 1;
}

.welcome-message.hidden {
  display: none;
}

.arch-logo-large {
  width: 80px;
  height: 80px;
  color: var(--accent);
  margin-bottom: 1.5rem;
  opacity: 0.8;
}

.welcome-message h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.welcome-message p {
  color: var(--text-secondary);
  max-width: 400px;
  margin-bottom: 2rem;
}

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.suggestion {
  padding: 0.625rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.suggestion:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--bg-tertiary);
}

/* Messages */
.messages {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.message {
  display: flex;
  gap: 0.75rem;
  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.assistant {
  align-self: flex-start;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.message.assistant .avatar {
  background-color: var(--bg-tertiary);
  color: var(--accent);
}

.avatar svg {
  width: 20px;
  height: 20px;
}

.message-content {
  padding: 0.875rem 1rem;
  border-radius: 16px;
  line-height: 1.5;
}

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

.message.assistant .message-content {
  background-color: var(--assistant-bubble);
  color: var(--assistant-bubble-text);
  border-bottom-left-radius: 4px;
}

/* Markdown Styling in Messages */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child {
  margin-top: 0;
}

.message-content h3 {
  font-size: 1.1rem;
}

.message-content h4 {
  font-size: 1rem;
}

.message-content p {
  margin-bottom: 0.75rem;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul,
.message-content ol {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.message-content li {
  margin-bottom: 0.25rem;
}

.message-content code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
  padding: 0.125rem 0.375rem;
  background-color: var(--code-bg);
  border-radius: 4px;
}

.message-content pre {
  margin: 0.75rem 0;
  padding: 1rem;
  background-color: var(--code-bg);
  border-radius: 8px;
  overflow-x: auto;
}

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

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

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

.message-content strong {
  font-weight: 600;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 0.5rem 0;
}

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

.typing-indicator span:nth-child(1) {
  animation-delay: -0.32s;
}

.typing-indicator 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: 1rem 1.5rem 1.5rem;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.input-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: all var(--transition-speed);
}

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

textarea {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  line-height: 1.5;
}

textarea::placeholder {
  color: var(--text-muted);
}

textarea:focus {
  outline: none;
}

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background-color: var(--accent);
  color: white;
  cursor: pointer;
  transition: all var(--transition-speed);
  flex-shrink: 0;
}

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

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

.disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive */
@media (max-width: 640px) {
  .header h1 {
    font-size: 1rem;
  }
  
  .message {
    max-width: 90%;
  }
  
  .suggestions {
    flex-direction: column;
  }
  
  .suggestion {
    width: 100%;
  }
  
  .welcome-message h2 {
    font-size: 1.25rem;
  }
}

/* Loading state */
.loading .send-btn {
  pointer-events: none;
}

.loading .send-btn svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}