/* ====================================
   Grok AI Chat - Complete Stylesheet
   Modern Responsive Design
   ==================================== */

/* ====================================
   CSS Variables
   ==================================== */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-light: #f8f9fa;
  --bg-dark: #1a202c;
  
  /* Light Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --border-color: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(102, 126, 234, 0.2);
}

[data-theme="dark"] {
  --bg-primary: #2d3748;
  --bg-secondary: #1a202c;
  --text-primary: #e9ecef;
  --text-secondary: #a0aec0;
  --border-color: #4a5568;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(66, 153, 225, 0.2);
}

/* ====================================
   Global Styles
   ==================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: background 0.3s ease, color 0.3s ease;
  overflow: hidden;
  height: 100vh;
}

/* ====================================
   Main Container
   ==================================== */
.chat-ai-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ====================================
   Sidebar Styles
   ==================================== */
.chat-sidebar {
  width: 280px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 1000;
}

@media (max-width: 991px) {
  .chat-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
    box-shadow: 2px 0 10px var(--shadow);
  }
  
  .chat-sidebar.show {
    transform: translateX(0);
  }
}

.sidebar-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1rem;
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

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

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.btn-close-sidebar {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 8px;
  transition: background 0.2s;
}

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

.btn-new-chat {
  width: 100%;
  padding: 0.75rem;
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  margin-bottom: 1rem;
}

.btn-new-chat:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.chat-history {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 1rem;
}

.history-section {
  margin-bottom: 1.5rem;
}

.history-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  padding: 0 0.5rem;
  letter-spacing: 0.5px;
}

.history-item {
  padding: 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  transition: background 0.2s;
  font-size: 0.9rem;
}

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

.history-item.active {
  background: var(--bg-secondary);
  font-weight: 500;
}

.history-item i {
  font-size: 1rem;
  color: var(--text-secondary);
}

.history-item span {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-nav {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  margin-bottom: 1rem;
}

.nav-link-item {
  padding: 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  transition: background 0.2s;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

.nav-link-item:hover {
  background: var(--bg-secondary);
}

.nav-link-item i {
  font-size: 1.1rem;
}

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

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.user-profile:hover {
  background: var(--bg-secondary);
}

.user-avatar {
  font-size: 2rem;
  color: var(--text-secondary);
}

.user-info {
  flex: 1;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.user-email {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ====================================
   Sidebar Overlay
   ==================================== */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  transition: opacity 0.3s;
}

.sidebar-overlay.show {
  display: block;
  opacity: 1;
}

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

/* ====================================
   Top Navbar
   ==================================== */
.top-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-menu {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background 0.2s;
}

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

.page-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}

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

.btn-nav-icon {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background 0.2s;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* ====================================
   Welcome Section
   ==================================== */
.welcome-section {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  overflow-y: auto;
}

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

.welcome-content {
  max-width: 800px;
  width: 100%;
  text-align: center;
}

.welcome-icon {
  font-size: 4rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.welcome-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.welcome-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .welcome-title {
    font-size: 1.75rem;
  }
  
  .welcome-subtitle {
    font-size: 1rem;
  }
}

.quick-prompts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

@media (max-width: 768px) {
  .quick-prompts {
    grid-template-columns: 1fr;
  }
}

.prompt-card {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  text-align: left;
}

.prompt-card:hover {
  border-color: #667eea;
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow);
}

.prompt-card i {
  font-size: 1.5rem;
  color: #667eea;
}

.prompt-text {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.prompt-text strong {
  font-size: 1rem;
  color: var(--text-primary);
}

.prompt-text span {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ====================================
   Chat Section
   ==================================== */
.chat-section {
  flex: 1;
  display: none;
  flex-direction: column;
  overflow: hidden;
}

.chat-section.active {
  display: flex;
}

.chat-messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 1rem;
}

@media (max-width: 768px) {
  .chat-messages-container {
    padding: 1rem;
  }
}

.chat-messages {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ====================================
   Messages
   ==================================== */
.message {
  display: flex;
  gap: 1rem;
  animation: fadeIn 0.3s ease;
}

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

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

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

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

.message.grok .message-avatar {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.message-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 75%;
}

@media (max-width: 768px) {
  .message-content {
    max-width: 85%;
  }
}

.message-bubble {
  padding: 1rem 1.25rem;
  border-radius: 18px;
  word-wrap: break-word;
  line-height: 1.6;
}

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

.message.grok .message-bubble {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
}

.message-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0 0.5rem;
}

.message.user .message-time {
  text-align: right;
}

/* ====================================
   Markdown Styling in Messages
   ==================================== */
.message-bubble p {
  margin-bottom: 0.75rem;
}

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

.message-bubble code {
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Courier New', monospace;
}

.message-bubble pre {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0.5rem 0;
}

.message-bubble pre code {
  background: transparent;
  padding: 0;
}

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

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

.message-bubble blockquote {
  border-left: 4px solid #667eea;
  padding-left: 1rem;
  margin: 0.5rem 0;
  color: var(--text-secondary);
}

.message-bubble a {
  color: #667eea;
  text-decoration: none;
}

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

.message-bubble img {
  max-width: 100%;
  border-radius: 8px;
  margin-top: 0.5rem;
}

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

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

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

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

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

/* ====================================
   Input Area
   ==================================== */
.input-area {
  padding: 1.5rem;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
  .input-area {
    padding: 1rem;
  }
}

.input-container {
  max-width: 900px;
  margin: 0 auto;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 24px;
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: #667eea;
  box-shadow: 0 0 0 3px var(--shadow-hover);
}

.btn-input-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.2s;
  flex-shrink: 0;
}

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

.message-textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 1rem;
  resize: none;
  max-height: 200px;
  padding: 0.5rem;
  font-family: inherit;
  line-height: 1.5;
}

.message-textarea::placeholder {
  color: var(--text-secondary);
}

.btn-send {
  background: var(--primary-gradient);
  border: none;
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.75rem;
  border-radius: 12px;
  transition: all 0.2s;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-send:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

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

.input-footer {
  margin-top: 0.75rem;
  text-align: center;
}

.input-footer small {
  color: var(--text-secondary);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* ====================================
   Image Preview
   ==================================== */
.image-preview-area {
  margin-bottom: 1rem;
}

.image-preview-item {
  position: relative;
  display: inline-block;
  animation: slideUp 0.3s ease;
}

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

.image-preview-item img {
  max-width: 300px;
  max-height: 300px;
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow);
  display: block;
}

@media (max-width: 768px) {
  .image-preview-item img {
    max-width: 200px;
    max-height: 200px;
  }
}

.image-preview-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.25rem;
  transition: background 0.2s;
}

.image-preview-remove:hover {
  background: rgba(0, 0, 0, 0.9);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
}

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

/* ====================================
   Loading Spinner
   ==================================== */
.spinner-border-sm {
  width: 1rem;
  height: 1rem;
  border-width: 0.15em;
}

/* ====================================
   Utility & Accessibility
   ==================================== */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid #667eea;
  outline-offset: 2px;
}

.d-none {
  display: none !important;
}

/* ====================================
   Print Styles
   ==================================== */
@media print {
  .chat-sidebar,
  .sidebar-overlay,
  .top-navbar,
  .input-area {
    display: none !important;
  }
  
  .chat-messages-container {
    overflow: visible !important;
    max-height: none !important;
  }
  
  .message {
    page-break-inside: avoid;
  }
}