/**
 * RADEXEL Design System - Chat Component
 *
 * Main AI Q&A interface:
 * - User messages: right-aligned, RADEXEL blue background
 * - AI messages: left-aligned, gray/surface background
 * - Input area with file attachment chips
 * - Code block rendering
 * - Streaming indicator (typing dots)
 */

/* ==========================================================================
   Chat Container
   ========================================================================== */

.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
}


/* ==========================================================================
   Chat Header
   ========================================================================== */

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
  flex-shrink: 0;
}

.chat-header__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}


/* ==========================================================================
   Messages Area
   ========================================================================== */

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}


/* ==========================================================================
   Welcome / Empty State
   ========================================================================== */

.chat-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  padding: var(--space-8);
}

.chat-welcome__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  opacity: 0.5;
}

.chat-welcome__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.chat-welcome__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 400px;
}

.chat-welcome__suggestions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.chat-welcome__suggestion {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    border-color var(--duration-fast) var(--ease-default),
    color var(--duration-fast) var(--ease-default);
}

.chat-welcome__suggestion:hover {
  background: var(--color-info-light);
  border-color: var(--rdx-blue);
  color: var(--rdx-blue);
}


/* ==========================================================================
   Message Bubble (Shared)
   ========================================================================== */

.chat-message {
  display: flex;
  gap: var(--space-3);
  max-width: 80%;
  animation: fadeInUp var(--duration-base) var(--ease-out);
}

.chat-message__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.chat-message__body {
  flex: 1;
  min-width: 0;
}

.chat-message__content {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  word-break: break-word;
}

.chat-message__content p {
  margin-bottom: var(--space-2);
}

.chat-message__content p:last-child {
  margin-bottom: 0;
}

.chat-message__time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  padding: 0 var(--space-1);
}


/* ==========================================================================
   User Message (Right-aligned, Blue)
   ========================================================================== */

.chat-message--user {
  flex-direction: row-reverse;
  align-self: flex-end;
}

.chat-message--user .chat-message__avatar {
  background: var(--rdx-blue-dark);
  color: var(--color-text-inverse);
}

.chat-message--user .chat-message__content {
  background: var(--chat-user-bg);
  color: var(--chat-user-text);
  border-bottom-right-radius: var(--radius-sm);
}

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

/* Links inside user messages */
.chat-message--user .chat-message__content a {
  color: var(--color-text-inverse);
  text-decoration: underline;
  opacity: 0.9;
}

.chat-message--user .chat-message__content a:hover {
  opacity: 1;
}


/* ==========================================================================
   AI / Assistant Message (Left-aligned, Gray)
   ========================================================================== */

.chat-message--ai {
  align-self: flex-start;
}

.chat-message--ai .chat-message__avatar {
  background: var(--rdx-green);
  color: var(--color-text-inverse);
}

.chat-message--ai .chat-message__content {
  background: var(--chat-ai-bg);
  color: var(--chat-ai-text);
  border-bottom-left-radius: var(--radius-sm);
}


/* ==========================================================================
   System Message (Centered, subtle)
   ========================================================================== */

.chat-message--system {
  max-width: 100%;
  justify-content: center;
}

.chat-message--system .chat-message__content {
  background: var(--color-warning-light);
  color: var(--color-warning-dark);
  text-align: center;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
}


/* ==========================================================================
   Code Blocks Inside Messages
   ========================================================================== */

.chat-message__content pre {
  margin: var(--space-3) 0;
  padding: var(--space-4);
  background: #1E1E2E;
  color: #CDD6F4;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  overflow-x: auto;
  position: relative;
}

/* Reset pre inside user messages */
.chat-message--user .chat-message__content pre {
  background: rgba(0, 0, 0, 0.2);
  color: var(--color-text-inverse);
}

.chat-message__content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* Copy button for code blocks */
.chat-code-copy {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  color: #A0A4B0;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition:
    opacity var(--duration-fast) var(--ease-default),
    background-color var(--duration-fast) var(--ease-default);
}

.chat-message__content pre:hover .chat-code-copy {
  opacity: 1;
}

.chat-code-copy:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #E8E8EC;
}

/* Inline code */
.chat-message__content code:not(pre code) {
  padding: 0.1em 0.35em;
  font-size: 0.9em;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.chat-message--user .chat-message__content code:not(pre code) {
  background: rgba(255, 255, 255, 0.15);
  color: inherit;
}


/* ==========================================================================
   Lists Inside Messages
   ========================================================================== */

.chat-message__content ul,
.chat-message__content ol {
  padding-left: var(--space-5);
  margin: var(--space-2) 0;
}

.chat-message__content li {
  margin-bottom: var(--space-1);
}

.chat-message__content ul li {
  list-style: disc;
}

.chat-message__content ol li {
  list-style: decimal;
}


/* ==========================================================================
   Streaming / Typing Indicator
   ========================================================================== */

.chat-typing {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
}

.chat-typing__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--rdx-green);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-typing__dots {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-3) var(--space-4);
  background: var(--chat-ai-bg);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-typing__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-text-muted);
  animation: typingDot 1.4s var(--ease-default) infinite;
}

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

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

/* Streaming cursor */
.chat-message__content .streaming-cursor::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--color-text);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: pulse 1s step-end infinite;
}

.chat-message--user .chat-message__content .streaming-cursor::after {
  background: var(--color-text-inverse);
}


/* ==========================================================================
   File Attachment Chips
   ========================================================================== */

.chat-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.chat-attachment {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    border-color var(--duration-fast) var(--ease-default);
}

.chat-attachment:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border);
}

.chat-attachment__icon {
  width: 14px;
  height: 14px;
}

.chat-attachment__name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-attachment__size {
  color: var(--color-text-muted);
}

.chat-attachment__remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: var(--color-bg-tertiary);
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 10px;
}

.chat-attachment__remove:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
}


/* ==========================================================================
   Input Area
   ========================================================================== */

.chat-input-area {
  flex-shrink: 0;
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg);
}

/* File attachment preview above input */
.chat-input-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4) 0;
}

.chat-input-form {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

/* Attach button */
.chat-input__attach {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    color var(--duration-fast) var(--ease-default);
}

.chat-input__attach:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.chat-input__attach svg {
  width: 18px;
  height: 18px;
}

/* Text input / textarea */
.chat-input__field {
  flex: 1;
  min-height: 36px;
  max-height: 200px;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  resize: none;
  transition:
    border-color var(--duration-fast) var(--ease-default),
    box-shadow var(--duration-fast) var(--ease-default);
}

.chat-input__field:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
  background: var(--color-bg);
}

.chat-input__field::placeholder {
  color: var(--color-text-muted);
}

/* Send button */
.chat-input__send {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--rdx-blue);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background-color var(--duration-fast) var(--ease-default),
    transform var(--duration-fast) var(--ease-default);
}

.chat-input__send:hover:not(:disabled) {
  background: var(--rdx-blue-dark);
}

.chat-input__send:active:not(:disabled) {
  transform: scale(0.95);
}

.chat-input__send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.chat-input__send svg {
  width: 18px;
  height: 18px;
}

/* Hint text below input */
.chat-input__hint {
  padding: 0 var(--space-4) var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
}


/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .chat-message {
    max-width: 90%;
  }

  .chat-messages {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .chat-input-form {
    padding: var(--space-2) var(--space-3);
  }

  .chat-welcome {
    padding: var(--space-4);
  }

  .chat-welcome__suggestions {
    flex-direction: column;
    align-items: stretch;
  }
}