/* Modern LLM Chat App Styles */

:root {
  /* Colors */
  --color-bg: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a24;
  --color-border: #2a2a36;
  --color-text: #e4e4e7;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-glow: rgba(99, 102, 241, 0.3);
  --color-success: #22c55e;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  --color-user: #6366f1;
  --color-assistant: #1a1a24;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px var(--color-primary-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Sidebar width */
  --sidebar-width: 280px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Utilities */
.hidden {
  display: none !important;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

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

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}

.btn-text {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-text:hover:not(:disabled) {
  color: var(--color-text);
}

.btn-icon {
  padding: var(--spacing-sm);
  border-radius: var(--radius-full);
}

.btn-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.btn-full {
  width: 100%;
}

/* Login Screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-lg);
  background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
}

.login-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl) var(--spacing-lg);
  width: 100%;
  max-width: 400px;
  text-align: center;
  animation: slideUp 0.5s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.login-card h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.login-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

#login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

#login-form input {
  padding: var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

#login-form input:focus {
  border-color: var(--color-primary);
}

.login-error {
  color: var(--color-error);
  font-size: 0.875rem;
  min-height: 1.25rem;
}

/* Chat Screen Layout */
.chat-screen {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

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

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

.sidebar-search {
  padding: var(--spacing-md);
}

.sidebar-search input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.875rem;
  outline: none;
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.conversation-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-bottom: var(--spacing-xs);
}

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

.conversation-item.active {
  background: var(--color-bg-tertiary);
  border-left: 2px solid var(--color-primary);
}

.conversation-item-icon {
  width: 32px;
  height: 32px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.conversation-item-icon svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-secondary);
}

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

.conversation-item-title {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item-time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.conversation-item-delete {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

/* Main Chat Area */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

/* Chat Header */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.chat-title {
  font-size: 1rem;
  font-weight: 600;
}

.model-select {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
}

.model-select:focus {
  border-color: var(--color-primary);
}

/* Messages Container */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Welcome Message */
.welcome-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  max-width: 600px;
  margin: auto;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.welcome-icon {
  width: 80px;
  height: 80px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.welcome-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.welcome-message h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.welcome-message p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.welcome-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

.feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.feature svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
}

/* Message Bubbles */
.message {
  display: flex;
  gap: var(--spacing-md);
  max-width: 800px;
  margin: 0 auto;
  animation: messageIn 0.3s ease;
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.message-assistant .message-avatar {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

.message-avatar svg {
  width: 20px;
  height: 20px;
  color: white;
}

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

.message-role {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.message-bubble {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  line-height: 1.7;
}

.message-user .message-bubble {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
}

.message-assistant .message-bubble {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
}

/* Markdown Styles */
.message-bubble p {
  margin-bottom: var(--spacing-md);
}

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

.message-bubble code {
  background: var(--color-bg);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 0.875em;
}

.message-bubble pre {
  background: var(--color-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

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

.message-bubble ul, .message-bubble ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-xl);
}

.message-bubble img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
}

/* Image Previews */
.image-previews {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg) 0;
}

.image-preview {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  overflow: hidden;
  animation: imageIn 0.2s ease;
}

@keyframes imageIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.image-preview 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: var(--radius-full);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-preview-remove svg {
  width: 12px;
  height: 12px;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--spacing-md);
}

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

.typing-indicator span:nth-child(1) { animation-delay: 0s; }
.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(-8px); }
}

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

.input-container {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast);
}

.input-container:focus-within {
  border-color: var(--color-primary);
}

.input-actions {
  display: flex;
  gap: var(--spacing-xs);
}

#message-input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  outline: none;
  max-height: 200px;
  line-height: 1.5;
}

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

.input-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
}

/* Voice Overlay */
.voice-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.voice-modal {
  text-align: center;
  animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.voice-animation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: var(--spacing-lg);
}

.voice-wave {
  width: 8px;
  height: 40px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  animation: voiceWave 1s ease-in-out infinite;
}

.voice-wave:nth-child(2) { animation-delay: 0.2s; height: 60px; }
.voice-wave:nth-child(3) { animation-delay: 0.4s; animation-delay: 0.4s; }

@keyframes voiceWave {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(1.5); }
}

#voice-status {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

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

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

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

  .mobile-only {
    display: flex;
  }

  .messages-container {
    padding: var(--spacing-md);
  }

  .input-area {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .welcome-features {
    flex-direction: column;
    align-items: center;
  }

  .model-select {
    max-width: 120px;
  }
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

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

/* Audio Player */
.audio-player {
  margin-top: var(--spacing-md);
}

.audio-player audio {
  width: 100%;
  height: 40px;
}

/* Loading spinner */
.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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