/* ──────────── Global / Reset ──────────── */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #667eea;
  --primary-dark: #5a67d8;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --text-dark: #2d3748;
  --text-light: #718096;
  --border-color: #e2e8f0;
  --user-bubble: #667eea;
  --bot-bubble: #f7fafc;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
  --bg-light: #1a202c;
  --bg-white: #2d3748;
  --text-dark: #f7fafc;
  --text-light: #a0aec0;
  --border-color: #4a5568;
  --bot-bubble: #4a5568;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-dark);
  height: 100vh;
  overflow: hidden;
  transition: all 0.3s ease;
}

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

/* ──────────── Navbar ──────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
}

.logo {
  width: 32px;
  height: 32px;
  fill: var(--primary-color);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: background-color 0.2s;
}
.theme-toggle:hover {
  background-color: var(--bg-light);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
}

/* ──────────── Main Content (positioned between navbar & footer) ──────────── */
.main-content {
  position: absolute;
  top: 60px;        /* directly below the 60px-high navbar */
  bottom: 60px;     /* directly above the 60px-high footer */
  left: 0;
  right: 0;
  display: flex;
  background: var(--bg-light);
}

/* ──────────── Sidebar (left) ──────────── */
.sidebar {
  width: 280px;
  background: var(--bg-white);
  border-right: 1px solid var(--border-color);
  transition: transform 0.3s ease;
  overflow-y: auto;
}
.sidebar.collapsed {
  transform: translateX(-100%);
}
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.chat-list {
  padding: 10px 0;
}
.chat-item {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  cursor: pointer;
  transition: background-color 0.2s;
}
.chat-item:hover {
  background-color: var(--bg-light);
}
.chat-item.active {
  background-color: var(--primary-color);
  color: white;
}
.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  margin-right: 12px;
}
.chat-info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.chat-info p {
  font-size: 0.8rem;
  color: var(--text-light);
  opacity: 0.8;
}

/* ──────────── Chat Container (center) ──────────── */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;      /* ensure only .chat-messages scrolls */
  background: var(--bg-light);
}

.chat-header {
  background: var(--bg-white);
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
}
.chat-header-avatar {
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  margin-right: 15px;
}
.chat-header-info h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.chat-header-info p {
  font-size: 0.85rem;
  color: var(--text-light);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;       /* THIS pane will scroll internally */
  padding: 20px;
  scroll-behavior: smooth;
}

.message {
  display: flex;
  margin-bottom: 15px;
  opacity: 0;
  transform: translateY(20px);
  animation: messageSlideIn 0.3s ease forwards;
}
@keyframes messageSlideIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.message.user {
  justify-content: flex-end;
}
.message-bubble {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: 18px;
  position: relative;
  word-wrap: break-word;
}
.message.user .message-bubble {
  background: var(--user-bubble);
  color: white;
  border-bottom-right-radius: 4px;
}
.message.bot .message-bubble {
  background: var(--bot-bubble);
  color: var(--text-dark);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border-color);
}
.message-time {
  font-size: 0.75rem;
  opacity: 0.7;
  margin-top: 4px;
  text-align: right;
}
.message.user .message-time {
  color: rgba(255,255,255,0.8);
}
.message.bot .message-time {
  color: var(--text-light);
  text-align: left;
}
.message-status {
  font-size: 0.7rem;
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.message.user .message-status {
  justify-content: flex-end;
  color: rgba(255,255,255,0.7);
}
.message.bot .message-status {
  color: var(--text-light);
}
.status-icon {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.typing-indicator {
  display: none;
  align-items: center;
  margin-bottom: 15px;
}
.typing-indicator .message-bubble {
  background: var(--bot-bubble);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
}
.typing-dots {
  display: flex;
  gap: 4px;
}
.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-light);
  animation: typingDot 1.4s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingDot {
  0%, 60%, 100% { opacity: 0.3; }
  30% { opacity: 1; }
}

/* ──────────── Chat Input (always pinned at bottom of chat-container) ──────────── */
.chat-input {
  background: var(--bg-white);
  border-top: 1px solid var(--border-color);
  padding: 15px 20px;
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-shrink: 0;     /* keep this row from collapsing */
}

.input-container {
  flex: 1;
  position: relative;
}

.chat-input textarea {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 10px 45px 10px 15px;
  font-family: inherit;
  font-size: 0.9rem;
  resize: none;
  outline: none;
  background: var(--bg-light);
  color: var(--text-dark);
  min-height: 40px;
  max-height: 120px;
  transition: border-color 0.2s;

  /* Hide the internal scrollbar inside the textarea */
  overflow-y: hidden;
  scrollbar-width: none;         /* Firefox */
  -ms-overflow-style: none;      /* IE 10+ */
}
.chat-input textarea:focus {
  border-color: var(--primary-color);
}
.chat-input textarea::-webkit-scrollbar {
  display: none;                 /* Chrome/Safari */
}

.send-button {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.send-button:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
}
.send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ──────────── Right Panel (optional) ──────────── */
.right-panel {
  width: 280px;
  background: var(--bg-white);
  border-left: 1px solid var(--border-color);
}
.panel-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}
.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
}
.panel-content {
  padding: 20px;
}
.info-item {
  margin-bottom: 15px;
}
.info-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 5px;
}
.info-value {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ──────────── Footer ──────────── */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-white);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.footer-text {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ──────────── Mobile Styles (≤768px) ──────────── */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    height: calc(100vh - 120px);
    z-index: 999;
    box-shadow: var(--shadow-lg);
  }
  .right-panel {
    display: none;
  }
  .chat-messages {
    padding: 15px;
  }
  .message-bubble {
    max-width: 85%;
  }
  .chat-input {
    padding: 12px 15px;
  }
  .navbar {
    padding: 0 15px;
  }
}

/* ──────────── Scrollbar Styles (for .chat-messages and sidebar) ──────────── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-light);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}