/* Base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --primary-dark: #1e3a8a;
  --secondary: #64748b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --background: #f3f4f6;
  --surface: #ffffff;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.5;
}

/* Login Page */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.login-container {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: var(--surface);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  padding: 2rem;
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  color: var(--primary);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--text-light);
  font-size: 0.875rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.form-group input {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder {
  color: var(--text-light);
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-dark);
}

.btn-secondary {
  background-color: var(--secondary);
  color: white;
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-text {
  display: inline;
}

.btn-loading {
  display: none;
}

.btn.loading .btn-text {
  display: none;
}

.btn.loading .btn-loading {
  display: inline;
}

/* Error message */
.error-message {
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--danger);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
}

.hidden {
  display: none !important;
}

.login-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.login-footer p {
  color: var(--text-light);
  font-size: 0.75rem;
}

/* Chat Page Layout */
.app-container {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.user-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-name {
  font-weight: 500;
  color: var(--text);
}

.logout-btn {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 0.875rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.logout-btn:hover {
  background: var(--background);
  color: var(--danger);
}

.new-chat-btn {
  width: 100%;
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.conversations-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.conversation-item {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 0.25rem;
  transition: background-color 0.15s;
}

.conversation-item:hover {
  background: var(--background);
}

.conversation-item.active {
  background: var(--primary-light);
  color: white;
}

.conversation-title {
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-date {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.conversation-item.active .conversation-date {
  color: rgba(255, 255, 255, 0.8);
}

/* Main Chat Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.chat-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 80%;
  animation: fadeIn 0.2s ease-out;
}

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

.message.user {
  align-self: flex-end;
}

.message.assistant {
  align-self: flex-start;
}

.message-content {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.message.user .message-content {
  background: var(--primary);
  color: white;
  border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
  background: var(--background);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

.message-time {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
  padding: 0 0.5rem;
}

.message.user .message-time {
  text-align: right;
}

/* Action Result */
.action-result {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

.action-result.success {
  background: #ecfdf5;
  border-color: #a7f3d0;
}

.action-result.error {
  background: #fef2f2;
  border-color: #fecaca;
}

/* Confirmation Box */
.confirmation-box {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 0.5rem;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(252, 211, 77, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(252, 211, 77, 0);
  }
}

.confirmation-box .icon {
  font-size: 1.25rem;
  margin-right: 0.5rem;
}

.confirmation-box .text {
  font-size: 0.875rem;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.confirmation-buttons {
  display: flex;
  gap: 0.5rem;
}

.confirmation-buttons .btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

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

.input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.input-wrapper textarea {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  min-height: 44px;
  max-height: 120px;
  line-height: 1.5;
}

.input-wrapper textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.send-btn {
  padding: 0.75rem 1.25rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.15s;
}

.send-btn:hover:not(:disabled) {
  background: var(--primary-dark);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 0.75rem 1rem;
  background: var(--background);
  border-radius: 12px;
  width: fit-content;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: var(--text-light);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px);
  }
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-light);
  text-align: center;
  padding: 2rem;
}

.empty-state h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.empty-state p {
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: left 0.3s ease;
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }

  .sidebar.open + .sidebar-overlay {
    display: block;
  }

  .menu-toggle {
    display: block;
  }

  .message {
    max-width: 90%;
  }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

/* Navigation */
.nav-links {
  padding: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.nav-link {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.875rem;
  transition: background-color 0.15s;
}

.nav-link:hover {
  background: var(--background);
}

.nav-link.active {
  background: var(--primary-light);
  color: white;
}