```css
:root {
  --primary: #2A7F9E;
  --primary-hover: #21677F;
  --secondary: #5FA9C2;
  --dark: #174A5B;
  --darker: #E7F1F4;
  --light-text: #24343D;
  --accent: #176B87;
  --danger: #D9534F;
  --border-color: #B9D5DE;
  --input-bg: #FFFFFF;
  --bot-message-bg: #FFFFFF;
  --user-message-bg: #2A7F9E;
  --page-bg: #F3F8FA;
}

body {
  background-color: var(--page-bg);
  color: var(--light-text);
  min-height: 100vh;
  font-family: "Inter", system-ui, sans-serif;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--secondary) var(--darker);
}

body::-webkit-scrollbar {
  width: 8px;
}

body::-webkit-scrollbar-thumb {
  background-color: var(--secondary);
  border-radius: 4px;
}

body::-webkit-scrollbar-track {
  background-color: var(--darker);
}

/* ============================================================
   Layout
   ============================================================ */

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================================
   Navbar
   ============================================================ */

.navbar {
  background-color: var(--dark);
  border-bottom: 1px solid var(--border-color);
  padding: 0.7rem 1rem;
}

.navbar-brand {
  font-weight: 700;
  color: #FFFFFF !important;
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand-name {
  color: #FFFFFF !important;
}

.navbar-text {
  color: #D5EAF0;
  font-size: 0.9rem;
}

/* Documentation / Tutorial navigation */

.top-navigation {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.top-navigation .nav-link {
  color: #FFFFFF !important;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  opacity: 1 !important;
}

.top-navigation .nav-link:hover {
  color: #D5EAF0 !important;
  text-decoration: underline;
}

.top-navigation .nav-link i {
  color: #FFFFFF !important;
}

/* Brand icon */

.brand-icon {
  color: var(--secondary);
  font-size: 1.25rem;
}

/* Brand logo */

.brand-logo {
  object-fit: contain;
  border-radius: 4px;
  transition: transform 0.2s ease;
}

.brand-logo:hover {
  transform: scale(1.05);
}

/* ============================================================
   Cards
   ============================================================ */

.chat-card {
  background-color: transparent;
  border: none;
  border-radius: 0;
  height: 100%;
  box-shadow: none;
  overflow: hidden;
}

.card-header,
.card-footer {
  background-color: rgba(255, 255, 255, 0.6);
  border-color: var(--border-color);
}

.card-footer {
  padding: 0.5rem 0.75rem;
  background-color: var(--darker);
}

/* ============================================================
   Chat Window
   ============================================================ */

.chat-window {
  min-height: calc(100vh - 140px);
  overflow-y: visible;
  padding: 1rem;
  padding-bottom: 150px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: transparent;
}

.chat-window::-webkit-scrollbar {
  display: none;
}

.chat-window::-webkit-scrollbar-thumb {
  display: none;
}

.chat-window::-webkit-scrollbar-track {
  display: none;
}

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

.message {
  display: flex;
  margin-bottom: 1rem;
  align-items: flex-start;
  clear: both;
}

.user-message {
  margin-left: auto;
  margin-right: 0;
  align-self: flex-end;
}

.bot-message {
  margin-right: 0;
  margin-left: 0;
  align-self: flex-start;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

/* ============================================================
   Bot Avatar
   ============================================================ */

.message-avatar {
  display: none;
}

.bot-message .message-avatar {
  display: flex;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
  background-color: #FFFFFF;
  box-shadow: 0 1px 2px rgba(23, 74, 91, 0.12);
}

.bot-message .message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   Message Bubbles
   ============================================================ */

.message-bubble {
  border-radius: 0.75rem;
  padding: 0.65rem 0.85rem;
  box-shadow: 0 1px 3px rgba(23, 74, 91, 0.08);
  position: relative;
  width: 100%;
  min-width: 100px;
  font-size: 1rem;
  line-height: 1.6;
}

.user-message .message-bubble {
  background-color: var(--user-message-bg);
  color: #FFFFFF;
  border-bottom-right-radius: 0.3rem;
}

.bot-message .message-bubble {
  background-color: transparent;
  color: var(--light-text);
  border: none;
  box-shadow: none;
  padding: 0;
  border-radius: 0;
}

.message-content {
  word-break: break-word;
  margin-bottom: 0.25rem;
  font-size: 1rem;
  line-height: 1.6;
}

.message-time {
  font-size: 0.6rem;
  opacity: 0.7;
  text-align: right;
}

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

.typing-indicator {
  margin-bottom: 0.5rem;
}

.typing-dots {
  display: flex;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.5rem;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background-color: var(--secondary);
  border-radius: 50%;
  animation: typing-dot 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) {
  animation-delay: 0s;
}

.typing-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing-dot {
  0%,
  80%,
  100% {
    transform: scale(0.6);
    opacity: 0.6;
  }

  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ============================================================
   Tool Indicator
   ============================================================ */

.tool-indicator {
  margin-bottom: 0.5rem;
}

.tool-searching {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  color: var(--accent);
  font-style: italic;
  font-size: 0.9rem;
}

.tool-message {
  color: var(--accent);
  font-weight: 500;
}

.search-dots {
  display: flex;
  gap: 0.2rem;
}

.search-dots span {
  width: 4px;
  height: 4px;
  background-color: var(--accent);
  border-radius: 50%;
  animation: search-pulse 1.2s infinite ease-in-out both;
}

.search-dots span:nth-child(1) {
  animation-delay: 0s;
}

.search-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.search-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes search-pulse {
  0%,
  80%,
  100% {
    transform: scale(0.8);
    opacity: 0.5;
  }

  40% {
    transform: scale(1.2);
    opacity: 1;
  }
}

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

.form-control {
  background-color: var(--input-bg);
  border-color: var(--border-color);
  color: var(--light-text);
  border-radius: 1.5rem;
  padding: 0.85rem 1.2rem;
  height: auto;
  font-size: 1rem;
}

.form-control:focus {
  background-color: var(--input-bg);
  color: var(--light-text);
  border-color: var(--primary);
  box-shadow: 0 0 0 0.25rem rgba(42, 127, 158, 0.18);
}

.input-group {
  border-radius: 1.5rem;
  overflow: hidden;
}

/* ============================================================
   Send Button
   ============================================================ */

.btn-send,
.chat-send-btn {
  background-color: var(--primary);
  color: #FFFFFF;
  border: none;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin-left: 0.5rem;
}

.btn-send:hover,
.chat-send-btn:hover {
  background-color: var(--primary-hover);
  color: #FFFFFF;
}

.btn-send i,
.chat-send-btn i {
  font-size: 0.9rem;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
  background-color: var(--dark) !important;
  border-top: 1px solid var(--border-color);
  color: #FFFFFF !important;
  text-align: center;
  padding: 0.5rem 0;
  font-size: 0.75rem;
  margin-bottom: 92px;
  position: relative;
  z-index: 101;
}

.leadership-label {
  color: #D5EAF0 !important;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.leadership-name {
  color: #FFFFFF !important;
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 2px;
}

/* ============================================================
   Tools Used
   ============================================================ */

.tools-used {
  font-size: 0.7rem;
  color: var(--accent);
  margin-top: 0.3rem;
  padding: 0.2rem 0.4rem;
  background-color: rgba(42, 127, 158, 0.08);
  border-radius: 0.25rem;
  border: 1px solid var(--border-color);
}

/* ============================================================
   Markdown Content
   ============================================================ */

.message-content h1,
.message-content h2,
.message-content h3 {
  color: var(--accent);
  margin-top: 0.75rem;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.message-content h1 {
  font-size: 1.2rem;
  font-weight: 700;
}

.message-content h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.message-content h3 {
  font-size: 1rem;
  font-weight: 600;
}

.message-content h5 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 0.4rem;
  color: var(--accent);
}

.message-content h5 + p {
  font-size: 0.8rem;
  margin-bottom: 0.4rem;
}

.message-content ul,
.message-content ol {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.message-content li {
  margin: 0.25rem 0;
  line-height: 1.4;
  font-size: 1rem;
}

.message-content p {
  margin: 0.5rem 0;
  line-height: 1.5;
  font-size: 1rem;
}

.message-content blockquote {
  border-left: 4px solid var(--primary);
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  background-color: rgba(42, 127, 158, 0.07);
  border-radius: 0 0.5rem 0.5rem 0;
  font-style: italic;
  font-size: 0.9rem;
}

.message-content code {
  background-color: rgba(23, 74, 91, 0.08);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-family: "Courier New", monospace;
  font-size: 0.875rem;
  color: var(--accent);
}

.message-content pre {
  background-color: rgba(23, 74, 91, 0.05);
  padding: 0.75rem;
  border-radius: 0.375rem;
  overflow-x: auto;
  margin: 0.5rem 0;
}

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

.message-content strong,
.message-content b {
  color: var(--accent);
  font-weight: 600;
}

.message-content em,
.message-content i {
  font-style: italic;
  color: var(--light-text);
}

/* ============================================================
   Streaming Content
   ============================================================ */

.streaming-content {
  position: relative;
}

.streaming-content::after {
  content: "|";
  color: var(--primary);
  animation: blink 1s infinite;
  font-weight: bold;
  margin-left: 2px;
}

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

  51%,
  100% {
    opacity: 0;
  }
}

/* ============================================================
   Main Container
   ============================================================ */

.container.py-3 {
  padding: 0.5rem !important;
}

/* ============================================================
   Chat Layout
   ============================================================ */

.chat-main-container {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  position: relative;
}

.chat-input-container {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  max-width: 800px;
  width: 100%;
  background-color: var(--page-bg);
  padding: 1rem;
  z-index: 100;
  border-top: none;
}

.chat-input-wrapper {
  width: 100%;
}

/* ============================================================
   Mobile Responsiveness
   ============================================================ */

@media (max-width: 768px) {

  .container-fluid {
    padding: 0;
  }

  .container {
    padding: 0.5rem;
  }

  h4.text-center {
    font-size: 1.25rem;
    margin-bottom: 1rem;
  }

  .navbar {
    padding: 0.25rem 0.5rem;
  }

  .navbar-brand {
    font-size: 1.1rem;
  }

  .navbar-text {
    font-size: 0.8rem;
  }

  .top-navigation {
    gap: 0.7rem;
  }

  .top-navigation .nav-link {
    font-size: 0.8rem;
  }

  .chat-window {
    min-height: calc(100vh - 200px);
    padding: 0.75rem;
    gap: 0.4rem;
    padding-bottom: 150px;
  }

  .chat-card {
    margin: 0;
    border-radius: 0.5rem;
  }

  .message {
    margin-bottom: 0.4rem;
  }

  .bot-message {
    gap: 0.4rem;
    width: 100%;
  }

  .user-message {
    margin-left: auto;
  }

  .bot-message .message-avatar {
    width: 20px;
    height: 20px;
  }

  .message-bubble {
    padding: 0.4rem 0.55rem;
    border-radius: 0.6rem;
    font-size: 0.85rem;
  }

  .message-avatar {
    display: none;
  }

  .card-footer {
    padding: 0.4rem;
  }

  .form-control {
    font-size: 1rem;
    padding: 0.5rem 0.75rem;
  }

  .btn {
    padding: 0.5rem 0.75rem;
    min-width: auto;
  }

  .chat-input-container {
    max-width: 100%;
    left: 0;
    transform: none;
    width: 100%;
    padding: 0.75rem;
  }

  footer {
    margin-bottom: 100px;
  }
}

/* ============================================================
   Small Mobile Screens
   ============================================================ */

@media (max-width: 480px) {

  .message {
    margin-bottom: 0.4rem;
  }

  .bot-message {
    width: 100%;
  }

  .message-bubble {
    padding: 0.45rem 0.6rem;
    font-size: 0.875rem;
    min-width: 80px;
  }

  .chat-window {
    padding: 0.5rem;
    gap: 0.4rem;
    padding-bottom: 150px;
  }

  h4.text-center {
    font-size: 1.1rem;
  }

  .top-navigation {
    gap: 0.45rem;
  }

  .top-navigation .nav-link {
    font-size: 0.75rem;
  }

  footer {
    margin-bottom: 105px;
  }

  .leadership-label {
    font-size: 0.7rem;
  }

  .leadership-name {
    font-size: 0.85rem;
  }
}
```