/* Marbel AI v2.1 - Comprehensive UI Styles */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --fg-primary: #0f172a;
  --fg-secondary: #64748b;
  --fg-muted: #94a3b8;
  --accent-primary: #1e293b;
  --accent-secondary: #0f172a;
  --accent-brand: #10b981;
  --accent-brand-hover: #059669;
  --accent-error: #ef4444;
  --accent-success: #10b981;
  --border-color: #cbd5e1;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--fg-primary);
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

img, picture, video, svg {
  max-width: 100%;
  display: block;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

button {
  font-family: inherit;
}

ul, ol, dl {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-weight: 600;
  line-height: 1.25;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============ Page Container ============ */
.page-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============ Layout ============ */
.layout {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.main {
  flex: 1;
  display: flex;
  width: 100%;
}

/* ============ Topbar ============ */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: white;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-ico {
  width: 36px;
  height: 36px;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.brand-accent {
  color: var(--accent-brand);
}

.brand-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Status Bar */
.status-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--fg-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.status-text {
  white-space: nowrap;
}

/* Model Selector */
.model-selector {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-primary);
  white-space: nowrap;
  transition: var(--transition-fast);
}

.model-selector:hover {
  background: var(--bg-tertiary);
}

.model-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: inherit;
  cursor: pointer;
  transition: var(--transition-fast);
}

.model-trigger:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}

.model-trigger-text {
  font-size: 0.75rem;
}

.model-trigger-caret {
  font-size: 0.6rem;
  color: var(--fg-muted);
  transition: transform var(--transition-fast);
}

.model-trigger.open .model-trigger-caret {
  transform: rotate(180deg);
}

.model-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 0.5rem 0;
  z-index: 100;
  display: none;
  flex-direction: column;
  gap: 0;
  list-style: none;
}

.model-dropdown.open {
  display: flex;
}

.model-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  color: var(--fg-primary);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.model-dropdown-item:hover,
.model-dropdown-item.highlighted {
  background: var(--bg-tertiary);
  color: var(--accent-primary);
}

.model-dropdown-item[role="option"]:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.model-dropdown-item.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* Theme Buttons */
.theme-area {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem 0.5rem;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--fg-secondary);
  font-size: 0.65rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--fg-primary);
}

.theme-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.theme-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Actions */
.actions-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.new-thread-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-primary);
  transition: var(--transition-fast);
}

.new-thread-btn:hover {
  background: var(--bg-tertiary);
}

/* ============ Conversation Sidebar ============ */
.conversation-area {
  display: flex;
  flex: 1;
  width: 100%;
}

.thread-sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  transition: var(--transition-fast);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--fg-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-close {
  display: none;
  padding: 0.25rem;
  background: none;
  color: var(--fg-muted);
  cursor: pointer;
  flex-shrink: 0;
}

.sidebar-close:hover {
  color: var(--fg-primary);
}

.thread-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.thread-list::-webkit-scrollbar {
  width: 6px;
}

.thread-list::-webkit-scrollbar-track {
  background: var(--bg-primary);
  border-radius: 3px;
}

.thread-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.thread-item {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  color: var(--fg-primary);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
  transition: var(--transition-fast);
}

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

.thread-item.active {
  background: var(--bg-primary);
  color: var(--accent-primary);
}

.thread-item .thread-id {
  font-size: 0.65rem;
  color: var(--fg-muted);
  margin-right: 0.5rem;
  min-width: 24px;
}

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

.thread-item .new-thread {
  margin-left: auto;
  font-size: 0.65rem;
  color: var(--fg-secondary);
}

/* Chat Main Area */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  isolation: isolate;
}

.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  color: var(--fg-secondary);
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  display: block;
}

.welcome-content h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--fg-primary);
}

.welcome-content p {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  color: var(--fg-secondary);
}

.start-chat-btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.start-chat-btn:hover {
  background: var(--accent-brand-hover);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  background: var(--bg-primary);
  isolation: isolate;
  scrollbar-gutter: stable both-edges;
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* Message Styles */
.message {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  animation: messageIn 300ms ease-out;
}

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

.message.user {
  justify-content: flex-end;
}

.message.assistant {
  justify-content: flex-start;
}

.message-avatar {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: white;
}

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

.message-avatar.assistant {
  background: var(--fg-secondary);
  color: white;
}

.message-bubble {
  max-width: 80%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
  position: relative;
}

.message-bubble.user {
  background: var(--accent-primary);
  color: white;
  border-bottom-right-radius: 2px;
}

.message-bubble.assistant {
  background: var(--bg-secondary);
  color: var(--fg-primary);
  border-bottom-left-radius: 2px;
}

.message-time {
  font-size: 0.65rem;
  opacity: 0.7;
  margin-top: 0.25rem;
}

.message-user .message-time {
  margin-left: auto;
  color: rgba(255, 255, 255, 0.7);
}

.message-assistant .message-time {
  color: var(--fg-muted);
}

.message-content {
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.message-content code {
  background: var(--bg-tertiary);
  color: var(--fg-primary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.75em;
  font-family: 'IBM Plex Mono', monospace;
}

.message-content pre {
  background: var(--bg-tertiary);
  color: var(--fg-primary);
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
}

/* Active Indicator */
.active-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.indicator-spark {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  animation: sparkPulse 2s ease-in-out infinite;
}

@keyframes sparkPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

.indicator-text {
  margin-left: 0.5rem;
  font-size: 0.75rem;
  color: var(--fg-muted);
}

/* ============ Composer ============ */
.composer {
  display: flex;
  align-items: stretch;
  padding: 0.75rem 1rem;
  background: white;
  border-top: 1px solid var(--border-color);
  gap: 0.75rem;
}

.composer-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.composer-wrapper .composer-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#input {
  flex: 1;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--fg-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  transition: var(--transition-fast);
  outline: none;
}

#input:focus {
  border-color: var(--accent-primary);
  background: white;
  box-shadow: 0 0 0 2px rgba(30, 41, 59, 0.1);
}

#input::placeholder {
  color: var(--fg-muted);
  font-size: 0.875rem;
}

.composer-input-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.send-btn {
  flex-shrink: 0;
  padding: 0.5rem;
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.send-btn:hover {
  background: var(--accent-brand-hover);
}

.send-btn:active {
  background: var(--accent-brand-hover);
  transform: scale(0.95);
}

.send-btn:focus-visible {
  outline: 2px solid white;
  outline-offset: 2px;
}

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

.mic-btn {
  flex-shrink: 0;
  padding: 0.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  color: var(--fg-primary);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.mic-btn:hover {
  background: var(--bg-tertiary);
}

.mic-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Suggestions Grid */
.suggestions-bar {
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.suggestions-title {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--fg-muted);
  margin-bottom: 0.5rem;
}

.suggestions-grid {
  display: grid;
  gap: 0.5rem;
}

.suggestion-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-primary);
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.suggestion-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.suggestion-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.suggestion-btn:active {
  background: var(--bg-tertiary);
}

/* ============ Responsive ============ */
@media (max-width: 640px) {
  .topbar {
    padding: 0.75rem;
    gap: 0.5rem;
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .topbar-right {
    flex: 1;
    justify-content: center;
    gap: 0.5rem;
  }

  .model-selector {
    display: none;
  }

  .theme-area {
    display: none;
  }

  .conversation-area {
    flex-direction: column-reverse;
  }

  .thread-sidebar {
    display: none;
    width: 100%;
    border-right: none;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
  }

  .sidebar-close {
    display: flex;
    align-self: flex-start;
  }

  .chat-main {
    width: 100%;
  }

  .welcome-screen {
    padding: 2rem 0.5rem;
  }

  .chat-messages {
    padding: 0.75rem;
  }

  .message-bubble {
    max-width: 85%;
  }

  .composer {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  #input {
    min-height: 40px;
    font-size: 0.875rem;
  }

  .suggestions-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.25rem;
  }

  .suggestion-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.65rem;
  }
}

@media (max-width: 480px) {
  .suggestions-grid {
    grid-template-columns: 1fr;
  }
}

/* ============ Focus States ============ */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  
  .status-dot {
    animation: none;
  }
  
  .message {
    animation: none;
  }
}