:root {
  --primary-accent: #007bff; /* A slightly brighter blue for primary actions */
  --primary-accent-hover: #0056b3;

  --bg-primary: #1e1e1e; /* Main background */
  --bg-secondary: #252526; /* Slightly lighter bg for elements like sidebar, headers */
  --bg-tertiary: #333333; /* For cards, input fields */
  --bg-hover: #3c3c3c; /* Hover states for list items, etc. */
  --bg-selected: #094771; /* Selected items, more prominent */

  --text-primary: #d4d4d4; /* Main text color */
  --text-secondary: #a0a0a0; /* Muted text, placeholders */
  --text-on-accent: #ffffff; /* Text on primary accent color buttons */

  --border-primary: #3c3c3c; /* Borders for layout separation */
  --border-secondary: #505050; /* Borders for interactive elements */

  --user-msg-bg: #2c3e50; /* User message background */
  --assistant-msg-bg: #34495e; /* Assistant message background */
  --message-header-bg: rgba(
    255,
    255,
    255,
    0.05
  ); /* Subtle header for messages */

  --danger: #e74c3c;
  --danger-hover: #c0392b;

  --scrollbar-thumb: #555;
  --scrollbar-track: var(--bg-secondary);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  height: 100vh;
  margin: 0;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

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

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #6a6a6a;
}

/* Sidebar */
.sidebar {
  width: 280px; /* Slightly wider */
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
}

.sidebar-header,
.sidebar-footer {
  padding: 1rem; /* Increased padding */
  border-bottom: 1px solid var(--border-primary);
}

.sidebar-footer {
  border-top: 1px solid var(--border-primary);
  border-bottom: none;
  margin-top: auto;
}

.thread-list {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  margin: 0;
  list-style: none;
}

.thread-item {
  padding: 0.75rem 1rem; /* Increased padding */
  border-bottom: 1px solid var(--border-primary);
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background-color 0.15s ease-in-out;
}

.thread-item:hover {
  background-color: var(--bg-hover);
}

.thread-item.selected {
  background-color: var(--bg-selected);
  color: var(--text-on-accent);
  font-weight: 600; /* Bolder */
}
.thread-item.selected:hover {
  background-color: var(--bg-selected); /* Keep selected color on hover */
}

/* Main content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: visible;
  background-color: var(--bg-primary);
}

.thread-controls {
  padding: 1rem; /* Increased padding */
  border-bottom: 1px solid var(--border-primary);
  background-color: var(--bg-secondary);
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem; /* Increased padding */
}

.message-composer {
  padding: 1rem; /* Increased padding */
  border-top: 1px solid var(--border-primary);
  background-color: var(--bg-secondary);
}

/* Messages */
.message {
  margin-bottom: 1.25rem; /* Increased margin */
  border-radius: 0.5rem; /* Slightly larger radius */
  overflow: visible;
  border: 1px solid var(--border-primary);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); /* Adjusted shadow for dark theme */
}

.message-user {
  background-color: var(--user-msg-bg);
}

.message-assistant {
  background-color: var(--assistant-msg-bg);
}

.message-header {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem; /* Increased padding */
  background-color: var(--message-header-bg);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-primary);
}

.message-role-icon {
  margin-right: 0.6rem;
  font-size: 1.1rem; /* Slightly larger icon */
}

.message-body {
  padding: 1rem; /* Increased padding */
}

.message-body textarea.form-control,
.message-body input.form-control {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-secondary);
}
.message-body textarea.form-control::placeholder,
.message-body input.form-control::placeholder {
  color: var(--text-secondary);
}

.message-footer {
  padding: 0.75rem 1rem; /* Increased padding */
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-primary);
  background-color: rgba(0, 0, 0, 0.1); /* Subtle footer background */
}

/* Form controls general */
.form-control,
.form-select {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 0.25rem;
}
.form-control:focus,
.form-select:focus {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 0.2rem rgba(var(--primary-accent), 0.25);
}
.form-control::placeholder {
  color: var(--text-secondary);
}

.btn {
  border-radius: 0.25rem;
  transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.btn-primary {
  background-color: var(--primary-accent);
  border-color: var(--primary-accent);
  color: var(--text-on-accent);
}
.btn-primary:hover {
  background-color: var(--primary-accent-hover);
  border-color: var(--primary-accent-hover);
  color: var(--text-on-accent);
}

.btn-outline-secondary {
  color: var(--text-primary);
  border-color: var(--border-secondary);
}
.btn-outline-secondary:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-secondary);
}

.btn-danger {
  background-color: var(--danger);
  border-color: var(--danger);
  color: var(--text-on-accent);
}
.btn-danger:hover {
  background-color: var(--danger-hover);
  border-color: var(--danger-hover);
  color: var(--text-on-accent);
}
.btn-outline-danger {
  /* For dark theme, filled might be better, but providing outline too */
  color: var(--danger);
  border-color: var(--danger);
}
.btn-outline-danger:hover {
  background-color: var(--danger);
  color: var(--text-on-accent);
}

.btn-sm {
  padding: 0.3rem 0.6rem; /* Slightly larger */
  font-size: 0.8rem;
}

.form-control-sm {
  padding: 0.3rem 0.6rem; /* Slightly larger */
  font-size: 0.9rem;
  height: auto; /* Let padding define height */
}

.input-group-sm > .form-control,
.input-group-sm > .input-group-text,
.input-group-sm > .btn {
  padding: 0.3rem 0.6rem;
  font-size: 0.9rem;
}

.icon-button {
  padding: 0.3rem;
  width: 2rem; /* Slightly larger */
  height: 2rem; /* Slightly larger */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

textarea.form-control {
  resize: vertical;
  min-height: 6rem; /* Slightly taller */
}

.meta-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.2rem;
}

.text-muted {
  /* Ensure Bootstrap's text-muted uses our theme color */
  color: var(--text-secondary) !important;
}

/* Tooltips */
[data-tooltip] {
  position: relative;
}

[data-tooltip]:hover:after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%; /* Position above the element */
  left: 50%;
  transform: translateX(-50%) translateY(-4px); /* Move up slightly */
  padding: 0.3rem 0.6rem;
  background: #111; /* Darker tooltip background */
  color: var(--text-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 0.25rem;
  white-space: nowrap;
  font-size: 0.8rem;
  z-index: 1000; /* Ensure tooltip is on top */
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    max-height: 45vh; /* Slightly more height for sidebar on mobile */
    border-right: none; /* No right border when stacked */
    border-bottom: 1px solid var(--border-primary);
  }
  .main-content {
    height: auto; /* Allow main content to take remaining space */
  }
}