/**
 * =========================================
 * CHAT - Messenger-Style Chat Component
 * =========================================
 *
 * Modern chat interface with:
 * - WebSocket real-time messaging
 * - Messenger-style bubbles
 * - Emoji picker support
 * - Desktop sidebar + Mobile drawer
 */

/* ============================================
 * CHAT SIDEBAR (Desktop 768px+)
 * ============================================ */

.chat-sidebar {
  display: none;
}

@media (min-width: 768px) {
  .chat-sidebar {
    display: flex;
    flex-direction: column;
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 360px;
    max-width: 30vw;
    background: var(--color-bg-primary);
    border-left: 1px solid var(--color-border);
    z-index: var(--z-sidebar, 100);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-out);
  }

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

  /* Adjust main content when chat is open */
  body.chat-open .main-content {
    margin-right: 360px;
    transition: margin-right var(--duration-base) var(--ease-out);
  }
}

@media (min-width: 1200px) {
  .chat-sidebar {
    width: 400px;
  }

  body.chat-open .main-content {
    margin-right: 400px;
  }
}

/* Chat toggle button for desktop */
.chat-toggle {
  display: none;
}

@media (min-width: 768px) {
  .chat-toggle {
    display: flex;
    position: fixed;
    right: var(--spacing-lg);
    bottom: var(--spacing-lg);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-purple-dark, #5b48c7));
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.4);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 24px;
    transition: all var(--transition-button);
    z-index: var(--z-fab, 1000);
  }

  .chat-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.5);
  }

  .chat-toggle.is-hidden {
    display: none;
  }

  /* Badge for unread messages */
  .chat-toggle__badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--color-danger);
    color: white;
    font-size: 12px;
    font-weight: bold;
    min-width: 20px;
    height: 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
    border: 2px solid var(--color-bg-primary);
    opacity: 0;
    transform: scale(0);
    transition: all 0.2s ease;
  }

  .chat-toggle__badge.has-unread {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================
 * CHAT HEADER
 * ============================================ */

.chat__header {
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.15), rgba(91, 72, 199, 0.1));
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.chat__header-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-purple);
  margin: 0;
}

.chat__status {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.chat__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-green);
  animation: pulse 2s infinite;
}

.chat__status-dot.disconnected {
  background: var(--color-danger);
  animation: none;
}

.chat__status-dot.connecting {
  background: var(--color-warning);
  animation: blink 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.chat__close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 20px;
  transition: all var(--transition-fast);
}

.chat__close:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-accent-purple);
}

/* ============================================
 * CHAT MESSAGES CONTAINER
 * ============================================ */

.chat__messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar */
.chat__messages::-webkit-scrollbar {
  width: 6px;
}

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

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

.chat__messages::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* ============================================
 * MESSAGE BUBBLES
 * ============================================ */

.chat-message {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: messageSlide 0.2s ease-out;
}

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

/* Incoming messages (left aligned) */
.chat-message--incoming {
  align-self: flex-start;
}

.chat-message--incoming .chat-message__bubble {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-radius: 18px 18px 18px 4px;
}

/* Outgoing messages (right aligned) */
.chat-message--outgoing {
  align-self: flex-end;
}

.chat-message--outgoing .chat-message__bubble {
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-purple-dark, #5b48c7));
  color: white;
  border-radius: 18px 18px 4px 18px;
}

/* Message bubble */
.chat-message__bubble {
  padding: var(--spacing-sm) var(--spacing-md);
  word-wrap: break-word;
  word-break: break-word;
  line-height: 1.4;
  font-size: var(--font-size-md);
}

/* Message sender name */
.chat-message__sender {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-purple);
  margin-bottom: 2px;
  padding-left: var(--spacing-xs);
}

.chat-message--outgoing .chat-message__sender {
  display: none;
}

/* Message timestamp */
.chat-message__time {
  font-size: 10px;
  color: var(--color-text-tertiary);
  margin-top: 2px;
  padding: 0 var(--spacing-xs);
}

.chat-message--outgoing .chat-message__time {
  text-align: right;
}

/* Group consecutive messages from same user */
.chat-message--grouped {
  margin-top: -4px;
}

.chat-message--grouped .chat-message__sender {
  display: none;
}

.chat-message--grouped.chat-message--incoming .chat-message__bubble {
  border-radius: 18px 18px 18px 4px;
}

.chat-message--grouped.chat-message--outgoing .chat-message__bubble {
  border-radius: 18px 18px 4px 18px;
}

/* ============================================
 * TYPING INDICATOR
 * ============================================ */

.chat-typing {
  display: none;
  align-self: flex-start;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border-radius: 18px;
  margin-top: var(--spacing-xs);
}

.chat-typing.is-visible {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.chat-typing__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

.chat-typing__dots {
  display: flex;
  gap: 3px;
}

.chat-typing__dot {
  width: 6px;
  height: 6px;
  background: var(--color-text-tertiary);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite;
}

.chat-typing__dot:nth-child(2) {
  animation-delay: 0.2s;
}

.chat-typing__dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px);
  }
}

/* ============================================
 * CHAT INPUT AREA
 * ============================================ */

.chat__input-area {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-primary);
  flex-shrink: 0;
}

.chat__input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border-radius: 24px;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast);
}

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

/* Emoji button */
.chat__emoji-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.chat__emoji-btn:hover {
  background: var(--color-bg-hover);
  color: var(--color-accent-purple);
}

.chat__emoji-btn.is-active {
  background: rgba(108, 92, 231, 0.1);
  color: var(--color-accent-purple);
}

/* Text input */
.chat__input {
  flex: 1;
  border: none;
  background: transparent;
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  resize: none;
  max-height: 100px;
  min-height: 20px;
  line-height: 1.4;
  font-family: inherit;
}

.chat__input::placeholder {
  color: var(--color-text-tertiary);
}

.chat__input:focus {
  outline: none;
}

/* Send button */
.chat__send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-purple-dark, #5b48c7));
  border: none;
  color: white;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.chat__send-btn:hover:not(:disabled) {
  transform: scale(1.1);
  box-shadow: 0 2px 8px rgba(108, 92, 231, 0.4);
}

.chat__send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Cooldown indicator */
.chat__cooldown {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-align: center;
  padding-top: var(--spacing-xs);
  display: none;
}

.chat__cooldown.is-visible {
  display: block;
}

/* ============================================
 * EMOJI PICKER
 * ============================================ */

.emoji-picker {
  display: none;
  position: absolute;
  bottom: 100%;
  left: var(--spacing-md);
  right: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
  max-height: 280px;
  overflow: hidden;
  z-index: 10;
}

.emoji-picker.is-open {
  display: flex;
  flex-direction: column;
}

/* Emoji picker tabs */
.emoji-picker__tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-xs);
  gap: var(--spacing-xs);
  overflow-x: auto;
  flex-shrink: 0;
}

.emoji-picker__tab {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 18px;
  opacity: 0.6;
  transition: all var(--transition-fast);
}

.emoji-picker__tab:hover {
  background: var(--color-bg-hover);
  opacity: 1;
}

.emoji-picker__tab.is-active {
  background: rgba(108, 92, 231, 0.1);
  opacity: 1;
}

/* Emoji grid */
.emoji-picker__content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.emoji-picker__grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}

.emoji-picker__emoji {
  width: 100%;
  aspect-ratio: 1;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.emoji-picker__emoji:hover {
  background: var(--color-bg-hover);
  transform: scale(1.2);
}

/* ============================================
 * CONNECTION STATUS BAR
 * ============================================ */

.chat__connection-bar {
  padding: var(--spacing-xs) var(--spacing-md);
  text-align: center;
  font-size: var(--font-size-sm);
  display: none;
}

.chat__connection-bar.is-visible {
  display: block;
}

.chat__connection-bar.connecting {
  background: rgba(252, 211, 77, 0.2);
  color: var(--color-warning);
}

.chat__connection-bar.disconnected {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-danger);
}

.chat__connection-bar.reconnecting {
  background: rgba(59, 130, 246, 0.2);
  color: #3b82f6;
}

/* ============================================
 * SYSTEM MESSAGES
 * ============================================ */

.chat-message--system {
  align-self: center;
  max-width: 90%;
}

.chat-message--system .chat-message__bubble {
  background: transparent;
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  font-style: italic;
  padding: var(--spacing-xs) var(--spacing-sm);
}

/* ============================================
 * DATE SEPARATOR
 * ============================================ */

.chat-date-separator {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.chat-date-separator__line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.chat-date-separator__text {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================
 * MOBILE DRAWER OVERRIDES
 * ============================================ */

@media (max-width: 767px) {
  /* Keep using drawer on mobile but with new message styles */
  .drawer--chat .drawer__content {
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
  }

  .drawer--chat #chat-messages {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .drawer--chat .drawer__footer {
    position: relative;
  }
}

/* ============================================
 * ACCESSIBILITY
 * ============================================ */

.chat__send-btn:focus-visible,
.chat__emoji-btn:focus-visible,
.emoji-picker__emoji:focus-visible {
  outline: 2px solid var(--color-accent-purple);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .chat-message,
  .chat-typing__dot {
    animation: none;
  }
}