/* References (do not remove; keep as comments)
   - OpenAI Responses API streaming (SSE): https://platform.openai.com/docs/guides/streaming-responses
   - Responses API reference (streaming): https://platform.openai.com/docs/api-reference/responses-streaming
   - Cloudflare AI Gateway (OpenAI provider + Authenticated Gateway token header cf-aig-authorization): https://developers.cloudflare.com/ai-gateway/usage/providers/openai/ and https://developers.cloudflare.com/cloudflare-one/tutorials/ai-wrapper-tenant-control/
   - CF Workers/Pages streaming ReadableStream + SSE: https://developers.cloudflare.com/workers/runtime-apis/streams/
   - CORS on Pages Functions (OPTIONS 204): https://developers.cloudflare.com/pages/functions/examples/cors-headers/
   - SSE event format basics: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events
*/

.chat-app { max-width: 920px; margin: 0 auto; padding: 1rem; }
.toolbar { display: flex; gap: .5rem; justify-content: space-between; align-items: center; }
#messages { margin: 1rem 0; height: calc(100vh - 280px); overflow: auto; padding: .5rem; border: 1px solid #2a2f3a; border-radius: .75rem; background: #0d1016; }
.msg { display: flex; margin: .375rem 0; }
.msg.user { justify-content: flex-end; }
.msg.assistant { justify-content: flex-start; }
.bubble { max-width: 85%; padding: .6rem .75rem; border-radius: .75rem; line-height: 1.25; white-space: pre-wrap; word-break: break-word; }
.msg.user .bubble { background: #1b365d; color: #e6f0ff; }
.msg.assistant .bubble { background: #121722; color: #e5e7eb; }
.input-dock { display: grid; grid-template-columns: 1fr auto; gap: .5rem; align-items: end; }
#prompt { width: 100%; min-height: 54px; max-height: 200px; padding: .6rem .75rem; background: #0d1117; color: #e5e7eb; border: 1px solid #2a2f3a; border-radius: .5rem; resize: vertical; line-height: 1.25; }
.pill { padding: .2rem .5rem; border-radius: 999px; font-size: .85rem; }
.pill--checking { background:#2a2f3a; color:#cbd5e1; }
.pill--ok { background:#0a7f3f; color:#e5f9ee; }
.pill--warn { background:#7f6a0a; color:#fff4cc; }
.pill--err { background:#7f0a0a; color:#ffe5e5; }
#toast { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); background: #111827; color:#e5e7eb; padding:.5rem .75rem; border-radius:.5rem; border:1px solid #374151; opacity:0; transition:opacity .2s ease; }
#toast.show { opacity:1; }
@media (max-width: 640px){ #messages { height: calc(100vh - 320px); } }

.connection-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--chat-text-dim);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-online);
  animation: pulse 2s infinite;
}

.status-indicator.offline {
  background: var(--status-offline);
  animation: none;
}

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

/* ===========================
   Chat Log
   =========================== */
.chat-log {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.message {
  display: flex;
  gap: 0.75rem;
  animation: slideIn 0.3s ease-out;
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: var(--chat-user-bg);
}

.message.assistant .message-avatar {
  background: var(--chat-accent);
}

.message-content {
  flex: 1;
  background: var(--chat-assistant-bg);
  border-radius: 12px;
  padding: 1rem;
  line-height: 1.6;
  max-width: 100%;
  word-wrap: break-word;
}

.message.user .message-content {
  background: var(--chat-user-bg);
}

.message-content p {
  margin: 0 0 0.5rem 0;
}

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

.message-content code {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.9em;
}

.message-content pre {
  background: rgba(0, 0, 0, 0.3);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.5rem 0;
}

.message-content pre code {
  background: none;
  padding: 0;
}

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

.chat-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  background: var(--chat-input-bg);
  color: var(--chat-text);
  border: 1px solid var(--chat-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  resize: none;
  max-height: 200px;
  transition: border-color 0.2s;
}

.chat-input:focus {
  outline: none;
  border-color: var(--chat-accent);
}

.chat-input::placeholder {
  color: var(--chat-text-dim);
}

.send-btn {
  background: var(--chat-accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

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

.send-btn:disabled {
  background: var(--chat-border);
  cursor: not-allowed;
  opacity: 0.5;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
  .sidebar-toggle {
    display: block;
  }

  .chat-sidebar {
    position: fixed;
    left: -260px;
    top: 60px;
    height: calc(100vh - 60px);
    z-index: 50;
    transition: left 0.3s ease-in-out;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
  }

  .chat-sidebar.open {
    left: 0;
  }

  .chat-wrapper {
    height: calc(100vh - 60px);
  }

  .chat-header {
    padding: 1rem;
  }

  .chat-header h2 {
    font-size: 1rem;
  }

  .mode-select {
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
  }

  .connection-status {
    font-size: 0.8rem;
  }

  .chat-log {
    padding: 1rem;
  }

  .chat-input-area {
    padding: 0.75rem 1rem;
  }

  .send-btn {
    padding: 0.75rem 1rem;
  }
}

/* ===========================
   Scrollbar Styling
   =========================== */
.chat-log::-webkit-scrollbar,
.chat-sidebar::-webkit-scrollbar {
  width: 8px;
}

.chat-log::-webkit-scrollbar-track,
.chat-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.chat-log::-webkit-scrollbar-thumb,
.chat-sidebar::-webkit-scrollbar-thumb {
  background: var(--chat-border);
  border-radius: 4px;
}

.chat-log::-webkit-scrollbar-thumb:hover,
.chat-sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--chat-accent);
}

/* ============================================
   MARKDOWN RENDERING STYLES
   ============================================ */

/* CSS Variables for Markdown (using existing chat variables where possible) */
:root {
  --color-primary: var(--chat-accent);
  --color-primary-hover: var(--chat-accent-hover);
  --color-text: var(--chat-text);
  --color-text-muted: var(--chat-text-dim);
  --color-bg: rgba(0, 0, 0, 0.3);
  --color-surface: var(--chat-surface);
  --color-surface-hover: rgba(74, 158, 255, 0.05);
  --color-border: var(--chat-border);
  --color-success: #34a853;
  --font-mono: 'Source Code Pro', monospace;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-12: 3rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 0.2s ease;
}

.message-content.markdown h1,
.message-content.markdown h2,
.message-content.markdown h3,
.message-content.markdown h4,
.message-content.markdown h5,
.message-content.markdown h6 {
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.message-content.markdown h1 { font-size: var(--text-2xl); border-bottom: 2px solid var(--color-border); padding-bottom: var(--space-2); }
.message-content.markdown h2 { font-size: var(--text-xl); border-bottom: 1px solid var(--color-border); padding-bottom: var(--space-2); }
.message-content.markdown h3 { font-size: var(--text-lg); }
.message-content.markdown h4 { font-size: var(--text-base); }
.message-content.markdown h5 { font-size: var(--text-sm); }
.message-content.markdown h6 { font-size: var(--text-sm); color: var(--color-text-muted); }

.message-content.markdown p {
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

/* Tighter line-height for chat markdown */
.chat-markdown {
  line-height: 1.25;
}

.message-content.markdown ul,
.message-content.markdown ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.message-content.markdown ul {
  list-style-type: disc;
}

.message-content.markdown ol {
  list-style-type: decimal;
}

.message-content.markdown li {
  margin-bottom: var(--space-2);
  line-height: 1.6;
}

.message-content.markdown li > ul,
.message-content.markdown li > ol {
  margin-top: var(--space-2);
  margin-bottom: var(--space-2);
}

.message-content.markdown blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-style: italic;
}

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

.message-content.markdown code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
}

.message-content.markdown pre {
  position: relative;
  background: var(--color-bg);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
}

.message-content.markdown pre code {
  background: none;
  padding: 0;
  border: none;
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* Code block language badge */
.code-block-wrapper {
  position: relative;
  margin: var(--space-4) 0;
}

.code-language {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  z-index: 1;
}

.copy-code-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-12);
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 1;
}

.copy-code-btn:hover {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

.copy-code-btn.copied {
  background: var(--color-success);
  color: var(--color-bg);
  border-color: var(--color-success);
}

.message-content.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.message-content.markdown thead {
  background: var(--color-surface);
}

.message-content.markdown th,
.message-content.markdown td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.message-content.markdown th {
  font-weight: 600;
  color: var(--color-primary);
}

.message-content.markdown tr:last-child td {
  border-bottom: none;
}

.message-content.markdown tr:hover {
  background: var(--color-surface-hover);
}

.message-content.markdown hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

.message-content.markdown a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
}

.message-content.markdown a:hover {
  color: var(--color-primary-hover);
  text-decoration-style: solid;
}

.message-content.markdown img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
}

.message-content.markdown strong {
  font-weight: 700;
  color: var(--color-text);
}

.message-content.markdown em {
  font-style: italic;
  color: var(--color-text-muted);
}

/* Task lists */
.message-content.markdown input[type="checkbox"] {
  margin-right: var(--space-2);
  cursor: pointer;
}

.message-content.markdown .task-list-item {
  list-style: none;
  margin-left: calc(-1 * var(--space-6));
  padding-left: var(--space-6);
}

/* Model Selector Styles */
.model-select {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  color: #ffffff;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-right: 12px;
  min-width: 200px;
}

/* Ensure existing #model benefits as well */
#model {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  color: #ffffff;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-right: 12px;
  min-width: 200px;
}

.model-select:hover, #model:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.model-select:focus, #model:focus {
  outline: none;
  border-color: #0ea5e9;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.2);
}

.model-select option, #model option {
  background: #1a1b26;
  color: #ffffff;
  padding: 8px;
}

/* Connection Status Enhancement */
.connection-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  font-size: 13px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

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

/* Error Message Styling */
.message-system {
  background: rgba(234, 67, 53, 0.1);
  border-left: 3px solid #ea4335;
  padding: 12px;
  margin: 12px 0;
  color: #f8bbd0;
  font-size: 14px;
  border-radius: 4px;
}

/* Chat Header Layout Fix */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(15, 17, 26, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-wrap: wrap;
  gap: 12px;
}

.chat-header h2 {
  margin: 0;
  font-size: 18px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Loading Animation for Messages */
.message-assistant.loading::after {
  content: '...';
  display: inline-block;
  animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
  0% { content: '.'; }
  33% { content: '..'; }
  66% { content: '...'; }
}