/* ==========================================================================
   CSS Variables & Theme Setup
   ========================================================================== */
:root {
  /* Dark Mode Variables (Default) */
  --bg-primary: #151113;
  --bg-secondary: #1e181c;
  --bg-hover: #2b2026;
  --border-color: #3d2f36;
  
  --text-primary: #f5eff2;
  --text-secondary: #dbced3;
  --text-muted: #9a8b91;
  
  --accent-color: #ffaa95;
  --accent-light: rgba(255, 170, 149, 0.1);
  --accent-gradient: linear-gradient(74deg, #e84393 0, #fdcb6e 100%);
  --maya-gradient: linear-gradient(135deg, #e84393 0%, #ff7675 50%, #fdcb6e 100%);
  
  --user-bubble-bg: #2b2026;
  --ai-bubble-bg: transparent;
  
  --sidebar-width: 280px;
  --header-height: 64px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.35);
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

body.light-mode {
  /* Light Mode Variables */
  --bg-primary: #fdfbfb;
  --bg-secondary: #f5efe9;
  --bg-hover: #ebdcd2;
  --border-color: #e0d1c7;
  
  --text-primary: #2d2024;
  --text-secondary: #5e4a51;
  --text-muted: #947e85;
  
  --accent-color: #d63031;
  --accent-light: rgba(214, 48, 49, 0.08);
  --accent-gradient: linear-gradient(74deg, #d63031 0, #e17055 100%);
  
  --user-bubble-bg: #f5efe9;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  outline: none;
}

textarea {
  font-family: inherit;
  resize: none;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

/* ==========================================================================
   Layout Structure
   ========================================================================== */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  position: relative;
  overflow: hidden;
}

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

.sidebar.collapsed {
  width: 0;
  transform: translateX(-100%);
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 12px 20px;
  border-radius: 50px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text-primary);
  flex-grow: 1;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.new-chat-btn:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-sm);
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

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

.sidebar-content {
  flex-grow: 1;
  overflow-y: auto;
  padding: 16px 8px;
}

/* Custom Scrollbar for Sidebar */
.sidebar-content::-webkit-scrollbar {
  width: 6px;
}
.sidebar-content::-webkit-scrollbar-thumb {
  background-color: transparent;
  border-radius: 10px;
}
.sidebar-content:hover::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
}

.history-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 12px;
  margin-bottom: 8px;
}

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

.empty-history {
  font-size: 13px;
  color: var(--text-muted);
  padding: 12px;
  text-align: center;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: background-color var(--transition-fast);
  group: hover;
  position: relative;
  cursor: pointer;
}

.history-item:hover, .history-item.active {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.history-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-grow: 1;
  min-width: 0;
}

.history-item-left span:last-child {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-actions {
  display: none;
  gap: 4px;
  position: absolute;
  right: 8px;
  background: linear-gradient(90deg, rgba(0,0,0,0) 0%, var(--bg-hover) 30%);
  padding-left: 20px;
  height: 100%;
  align-items: center;
  top: 0;
}

.history-item:hover .history-item-actions {
  display: flex;
}

.history-action-mini-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.history-action-mini-btn:hover {
  color: var(--text-primary);
  background-color: rgba(255,255,255,0.1);
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
}

.sidebar-action-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  transition: background-color var(--transition-fast);
}

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

/* ==========================================================================
   Main Chat Area
   ========================================================================== */
.chat-container {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  height: 100%;
  min-width: 0;
  position: relative;
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal);
}

/* Header */
.chat-header {
  height: var(--header-height);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid transparent;
  z-index: 10;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Model Selector Button */
.model-selector-wrapper {
  position: relative;
}

.model-select-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.model-logo-icon {
  background: var(--maya-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 20px;
  font-weight: bold;
}

/* Dropdown */
.model-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 320px;
  display: none;
  flex-direction: column;
  padding: 8px;
  z-index: 200;
}

.model-dropdown.show {
  display: flex;
  animation: fadeInDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

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

.dropdown-item.active {
  background-color: var(--accent-light);
}

.dropdown-item.active .model-title {
  color: var(--accent-color);
}

.model-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.model-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  font-size: 10px;
  background: var(--maya-gradient);
  color: white;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 500;
  font-family: var(--font-sans);
}

.model-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Chat Body / Scroll Area */
.chat-body {
  flex-grow: 1;
  overflow-y: auto;
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  scroll-behavior: smooth;
}

.chat-body::-webkit-scrollbar {
  width: 8px;
}
.chat-body::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
}

/* Welcome Screen */
.welcome-screen {
  max-width: 800px;
  width: 90%;
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding: 40px 0;
}

.welcome-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.welcome-title {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: var(--maya-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
  background-size: 200% auto;
}

.welcome-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  font-weight: 400;
}

.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.suggestion-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: 16px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: transform var(--transition-normal), border-color var(--transition-normal), background-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.suggestion-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-color);
  background-color: var(--bg-hover);
  box-shadow: var(--shadow-md);
}

.suggestion-card p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-secondary);
}

.card-icon {
  width: 36px;
  height: 36px;
  background-color: var(--bg-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: flex-end;
  color: var(--accent-color);
}

/* Messages List */
.messages-list {
  width: 100%;
  max-width: 800px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.message-wrapper {
  display: flex;
  gap: 20px;
  width: 100%;
  animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 600;
  font-size: 14px;
  box-shadow: var(--shadow-sm);
}

.message-wrapper.user .message-avatar {
  background-color: #f1f3f4;
  color: #1a73e8;
  background: var(--accent-gradient);
  color: white;
}

.message-wrapper.model .message-avatar {
  background: var(--maya-gradient);
  color: white;
  font-family: var(--font-display);
}

.message-content-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-grow: 1;
  min-width: 0;
}

.message-content {
  border-radius: 12px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  word-break: break-word;
}

/* Markdown styling inside message-content */
.message-content p {
  margin-bottom: 12px;
}

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

.message-content pre {
  margin: 16px 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: #1e1e1e;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background-color: #2d2d2d;
  color: #bbb;
  font-size: 12px;
  font-family: var(--font-sans);
  border-bottom: 1px solid #3d3d3d;
}

.copy-code-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #bbb;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.copy-code-btn:hover {
  background-color: rgba(255,255,255,0.1);
  color: #fff;
}

.message-content code {
  font-family: var(--font-mono);
  font-size: 14px;
  background-color: rgba(128, 128, 128, 0.15);
  padding: 2px 6px;
  border-radius: 4px;
}

.message-content pre code {
  display: block;
  padding: 16px;
  overflow-x: auto;
  background-color: transparent;
  color: #f8f8f2;
}

.message-content h1, .message-content h2, .message-content h3 {
  font-family: var(--font-display);
  margin: 20px 0 10px 0;
  font-weight: 600;
}

.message-content h1 { font-size: 22px; }
.message-content h2 { font-size: 18px; }
.message-content h3 { font-size: 16px; }

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

.message-content li {
  margin-bottom: 6px;
}

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

.message-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

.message-content th, .message-content td {
  border: 1px solid var(--border-color);
  padding: 10px 12px;
  text-align: left;
}

.message-content th {
  background-color: var(--bg-secondary);
  font-weight: 600;
}

/* User Message styling - looks nice as a bubble */
.message-wrapper.user .message-content {
  background-color: var(--user-bubble-bg);
  padding: 12px 16px;
  border-radius: 18px;
  align-self: flex-start;
  max-width: 85%;
}

.message-actions {
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity var(--transition-fast);
  margin-top: 4px;
}

.message-wrapper:hover .message-actions {
  opacity: 1;
}

.message-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.message-action-btn span {
  font-size: 16px;
}

/* Typing / Shimmer Loader */
.typing-indicator {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.shimmer-line {
  height: 16px;
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: loadingShimmer 1.5s infinite;
  border-radius: 4px;
}

.shimmer-line.w-80 { width: 80%; }
.shimmer-line.w-90 { width: 90%; }
.shimmer-line.w-60 { width: 60%; }

/* ==========================================================================
   Bottom Chat Input Panel
   ========================================================================== */
.chat-input-panel {
  padding: 0 24px 24px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg-primary);
  z-index: 10;
}

.input-container-wrapper {
  width: 100%;
  max-width: 800px;
  position: relative;
}

.input-container {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 26px;
  padding: 8px 16px 8px 24px;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.input-container:focus-within {
  border-color: var(--accent-color);
  box-shadow: var(--shadow-md);
}

.input-container textarea {
  width: 100%;
  min-height: 44px;
  max-height: 200px;
  padding: 10px 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
}

.input-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4px;
  border-top: 1px solid transparent;
  padding-top: 4px;
}

.input-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--bg-hover);
  color: var(--text-muted);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.send-btn:not(:disabled) {
  background-color: var(--accent-color);
  color: var(--bg-primary);
  cursor: pointer;
}

.send-btn:not(:disabled):hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.disclaimer-text {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 12px;
  text-align: center;
}

/* ==========================================================================
   Modals
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal-backdrop.show {
  display: flex;
  animation: fadeIn 0.2s ease;
}

.modal {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.show .modal {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group textarea {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  line-height: 1.5;
  transition: border-color var(--transition-fast);
}

.form-group textarea:focus {
  border-color: var(--accent-color);
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: background-color var(--transition-fast), filter var(--transition-fast);
}

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

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

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

.btn-primary:hover {
  filter: brightness(1.1);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes loadingShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */
@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  
  .sidebar.show-mobile {
    transform: translateX(0);
    width: var(--sidebar-width);
  }
  
  .sidebar.collapsed {
    transform: translateX(-100%);
    width: var(--sidebar-width);
  }
  
  .chat-header {
    padding: 0 16px;
  }
  
  .welcome-title {
    font-size: 32px;
  }
  
  .welcome-subtitle {
    font-size: 15px;
  }
  
  .suggestions-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .messages-list {
    padding: 0 16px;
  }
  
  .chat-input-panel {
    padding: 0 16px 16px 16px;
  }
}

@media (max-width: 480px) {
  .suggestions-grid {
    grid-template-columns: 1fr;
  }
  
  .suggestion-card {
    min-height: 100px;
    padding: 16px;
  }
  
  .welcome-title {
    font-size: 26px;
  }
}