:root {
  /* Purple themed color scheme */
  --background-color: black;
  --text-color: #ffffff;
  --input-background: #2d2d2d;
  --user-message-color: #2b5278;
  --assistant-message-color: #2d2d2d;
  --button-color: #8e44ad;
  --accent-color: green;
  --border-radius: 8px;
  --transition-speed: 0.3s;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

body,
html {
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  height: 100%;
  background-color: var(--background-color);
  color: var(--text-color);
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Header: Server URL & Model Selection */
#server-url-container {
  padding: 0.75rem;
  background-color: var(--input-background);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
}

#server-url {
  flex-grow: 1;
  padding: 0.5rem 0.75rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--background-color);
  color: var(--text-color);
  font-size: 0.95rem;
}

#server-port {
  flex-grow: 1;
  padding: 0.5rem 0.75rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--background-color);
  color: var(--text-color);
  font-size: 0.95rem;
}

/* Model selection dropdown */
#model-select {
  padding: 0.5rem;
  font-size: 0.95rem;
  margin-right: 0.5rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--background-color);
  color: var(--text-color);
}

#connect-button {
  padding: 0.55rem 1rem;
  background-color: var(--button-color);
  color: var(--text-color);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.95rem;
  transition: background-color var(--transition-speed);
}

#connect-button:hover {
  background-color: var(--accent-color);
}

#connection-status {
  width: 100%;
  text-align: center;
  padding: 0.5rem;
  font-size: 0.85rem;
  background-color: var(--input-background);
  color: #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

#status-text {
  /* The status dot is added via ::before on #connection-status */
}

#connection-status>#toggle-header {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
  flex-shrink: 0;
}

#connection-status>#toggle-header:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* Main content: sidebar + chat area */
#main-content {
  display: flex;
  flex-grow: 1;
  overflow: hidden;
  position: relative;
}

/* Chat sidebar */
#chat-sidebar {
  width: 250px;
  background-color: var(--input-background);
  border-right: 1px solid #333;
  overflow: hidden;
  transition: width var(--transition-speed) ease;
  position: relative;
  flex-shrink: 0;
}

#chat-sidebar.collapsed {
  width: 40px;
}

/* Toggle sidebar button — outside sidebar, positioned at right edge of sidebar on desktop */
#toggle-sidebar {
  position: absolute;
  top: 10px;
  left: 240px;
  /* sidebar width 250px - 10px offset */
  background-color: var(--button-color);
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  color: var(--text-color);
  cursor: pointer;
  transition: left var(--transition-speed) ease, background-color var(--transition-speed);
  z-index: 10;
}

#toggle-sidebar:hover {
  background-color: var(--accent-color);
}

/* When sidebar is collapsed, move button to the new edge */
#chat-sidebar.collapsed~#toggle-sidebar {
  left: 30px;
  /* collapsed width 40px - 10px offset */
}

/* Sidebar content */
.sidebar-content {
  padding: 1rem;
  transition: opacity var(--transition-speed) ease;
}

#chat-sidebar.collapsed .sidebar-content {
  opacity: 0;
  pointer-events: none;
}

#chat-sidebar-header {
  display: flex;
  justify-content: space-between;
  /* align-items: center; */
  text-align: right;
  float: right;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  font-weight: 600;
}

#new-chat-button {
  width: 100%;
  padding: 0.5rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--button-color);
  color: var(--text-color);
  cursor: pointer;
  margin-bottom: 1rem;
  transition: background-color var(--transition-speed);
  font-size: 0.9rem;
}

#new-chat-button:hover {
  background-color: var(--accent-color);
}

#download-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

#download-label {
  flex-grow: 1;
}

#download-html-button,
#download-md-button {
  padding: 0.4rem 0.6rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--button-color);
  color: var(--text-color);
  cursor: pointer;
  transition: background-color var(--transition-speed);
  font-size: 0.85rem;
}

#download-html-button:hover,
#download-md-button:hover {
  background-color: var(--accent-color);
}

#chat-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Chat titles */
#chat-list li {
  padding: 0.75rem;
  border-radius: var(--border-radius);
  margin-bottom: 0.5rem;
  background-color: var(--background-color);
  cursor: pointer;
  transition: background-color var(--transition-speed);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.9rem;
  position: relative;
}

#chat-list li:hover {
  background-color: var(--input-background);
}

#chat-list li.active {
  background-color: var(--button-color);
  font-weight: 600;
}

/* Custom context menu for deleting chats */
#context-menu {
  display: none;
  position: absolute;
  background-color: var(--button-color);
  color: var(--text-color);
  padding: 0.5rem;
  border-radius: 4px;
  z-index: 1000;
  cursor: pointer;
  font-size: 0.9rem;
}

/* Chat section */
#chat-section {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: linear-gradient(135deg, #2c0f4b, #1e0a3c);
  padding: 1rem;
  border-radius: 10px;
  margin: 1rem;
}

#chat-container {
  flex-grow: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: rgba(0, 0, 0);
  border-radius: 8px;
}

/* Message card styling */
.message {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  word-wrap: break-word;
  font-size: 0.95rem;
  line-height: 1.5;
  background-color: var(--assistant-message-color);
  box-shadow: var(--shadow);
  animation: fadeIn 0.3s ease;
}

.user-message {
  align-self: flex-end;
  background-color: var(--user-message-color);
}

.assistant-message {
  align-self: flex-start;
  background-color: var(--assistant-message-color);
}

.message-header {
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.message-timestamp {
  font-weight: 400;
  font-size: 0.75rem;
  color: #888;
}

.message-model {
  font-size: 0.75rem;
  color: #ccc;
  margin-bottom: 0.35rem;
}

.message-content {
  margin-bottom: 0.5rem;
}

.message-metrics {
  font-size: 0.75rem;
  color: #ccc;
  text-align: right;
}

/* Enhanced Markdown styling */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.message-content h5,
.message-content h6 {
  margin: 0.5rem 0;
  font-weight: 600;
}

.message-content p {
  margin: 0.5rem 0;
  line-height: 1.6;
}

.message-content code {
  background-color: rgba(27, 31, 35, 0.15);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
}

.message-content pre {
  background-color: #282c34;
  color: #abb2bf;
  padding: 0.8rem;
  overflow-x: auto;
  border-radius: 6px;
  margin: 0.5rem 0;
}

.message-content blockquote {
  border-left: 4px solid var(--button-color);
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  color: #ccc;
  background: rgba(142, 68, 173, 0.1);
}

/* Input container */
#input-container {
  padding: 0.75rem;
  background-color: rgba(44, 15, 75, 0.8);
  border-top: 1px solid #333;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow);
  border-radius: 10px;
}

/* Image upload button */
#upload-button {
  background-color: var(--button-color);
  color: var(--text-color);
  border: none;
  border-radius: 50%;
  width: 2.75rem;
  height: 2.75rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color var(--transition-speed);
}

#upload-button:hover {
  background-color: var(--accent-color);
}

/* Image preview */
#image-preview {
  display: none;
  max-width: 50px;
}

#user-input {
  flex-grow: 1;
  padding: 0.6rem 0.75rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--background-color);
  color: var(--text-color);
  font-size: 0.95rem;
}

#user-input::placeholder {
  color: #bbb;
}

#send-button {
  background-color: var(--button-color);
  color: var(--text-color);
  border: none;
  border-radius: 50%;
  width: 2.75rem;
  height: 2.75rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color var(--transition-speed);
}

#send-button:hover {
  background-color: var(--accent-color);
}

#send-button.stop-button {
  background-color: #dc3545;
}

#send-button.stop-button:hover {
  background-color: #c82333;
}



#header-content {
  display: flex;
  flex-wrap: wrap;
  flex-grow: 1;
  gap: 0.5rem;
  align-items: center;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  overflow: hidden;
}

#server-url-container.collapsed #header-content {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  margin: 0;
  padding: 0;
}

#server-url-container.collapsed {
  padding: 0.25rem 0.75rem;
}

/* Connection status dot indicator */
#status-text::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
  margin-right: 6px;
  vertical-align: middle;
}

/* === Responsive: Tablet (768px) === */
@media (max-width: 768px) {
  .message {
    max-width: 92%;
  }

  #header-content {
    flex-direction: column;
    align-items: stretch;
  }

  #server-port,
  #server-url,
  #connect-button,
  #model-select {
    width: 100%;
    margin-right: 0;
    margin-bottom: 0.25rem;
  }

  #chat-sidebar {
    width: 220px;
  }

  #chat-section {
    margin: 0.5rem;
    padding: 0.75rem;
  }
}

/* === Responsive: Mobile (480px) === */
@media (max-width: 480px) {
  .message {
    max-width: 95%;
    font-size: 0.9rem;
  }

  /* Sidebar becomes a full-height overlay */
  #chat-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100%;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform var(--transition-speed) ease;
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.5);
  }

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

  #chat-sidebar.collapsed {
    transform: translateX(-100%);
  }

  /* Overlay backdrop */
  #chat-sidebar::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
  }

  #chat-sidebar.mobile-open::after {
    pointer-events: auto;
    opacity: 1;
  }

  /* Toggle button on mobile — fixed at top-left, always visible */
  #toggle-sidebar {
    position: fixed;
    top: 8px;
    left: 8px;
    z-index: 200;
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  /* Reset the left position from desktop */
  #chat-sidebar.collapsed~#toggle-sidebar {
    left: 8px;
  }

  /* Chat section takes full width on mobile */
  #chat-section {
    margin: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
  }

  /* Input container adjustments */
  #input-container {
    gap: 0.35rem;
    padding: 0.5rem;
  }

  #user-input {
    font-size: 0.9rem;
    padding: 0.5rem 0.6rem;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Copy code button styles */
.copy-btn {
  position: absolute;
  top: 5px;
  right: 5px;
  background-color: var(--accent-color);
  color: var(--text-color);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 6px;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.copy-btn:hover {
  opacity: 1;
}

.reasoning-content {
  color: #888;
  font-style: italic;
  border: 1px dashed;
  padding: 0.5em;
}

.reasoning-content:hover {
  color: #aaa;
}

.reasoning-details {
  margin-bottom: 0.5rem;
}

.reasoning-toggle {
  color: gray;
}

.reasoning-toggle {
  cursor: pointer;
  color: #888;
  font-style: italic;
  font-size: 0.9rem;
  user-select: none;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(136, 136, 136, 0.1);
  transition: background 0.2s;
}

.reasoning-toggle:hover {
  background: rgba(136, 136, 136, 0.2);
}

.reasoning-details:not([open]) .reasoning-content {
  display: none;
}