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

:root {
  --bg-primary: #0e1621;
  --bg-secondary: #17212b;
  --bg-message-out: #2b5278;
  --bg-message-in: #182533;
  --text-primary: #ffffff;
  --text-secondary: #8b9399;
  --accent: #5288c1;
  --accent-hover: #6ba0d5;
  --error: #e53935;
  --border: #0e1621;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
}

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

.app.connecting {
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.loader {
  width: 40px;
  height: 40px;
  border: 3px solid var(--bg-secondary);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Auth Container */
.auth-container {
  max-width: 400px;
  margin: auto;
  padding: 2rem;
  text-align: center;
}

.auth-container h2 {
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.auth-container p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.auth-container form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.auth-container input {
  padding: 1rem;
  font-size: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  text-align: center;
}

.auth-container input:focus {
  outline: none;
  border-color: var(--accent);
}

.auth-container input::placeholder {
  color: var(--text-secondary);
}

.auth-container button {
  padding: 1rem;
  font-size: 1rem;
  font-weight: 600;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: white;
  cursor: pointer;
  transition: background 0.2s;
}

.auth-container button:hover:not(:disabled) {
  background: var(--accent-hover);
}

.auth-container button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.auth-container button.secondary {
  background: var(--bg-secondary);
}

.auth-container button.secondary:hover:not(:disabled) {
  background: var(--bg-message-in);
}

.error {
  color: var(--error);
  margin-top: 1rem;
}

/* Chat Container */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.chat-header h1 {
  font-size: 1.25rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-secondary);
}

.status.online::before {
  background: #4caf50;
}

.status.offline::before {
  background: var(--error);
}

.username {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Message List */
.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.empty-state {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
}

.message {
  display: flex;
  max-width: 70%;
}

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

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

.message-content {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  position: relative;
}

.message.outgoing .message-content {
  background: var(--bg-message-out);
  border-bottom-right-radius: 4px;
}

.message.incoming .message-content {
  background: var(--bg-message-in);
  border-bottom-left-radius: 4px;
}

.sender {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.message.outgoing .sender {
  display: none;
}

.text {
  word-wrap: break-word;
  white-space: pre-wrap;
}

.time {
  display: block;
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-align: right;
  margin-top: 0.25rem;
}

/* Message Input */
.message-input {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.message-input textarea {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-primary);
  resize: none;
  min-height: 44px;
  max-height: 120px;
}

.message-input textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.message-input textarea::placeholder {
  color: var(--text-secondary);
}

.message-input button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  background: var(--accent);
  border: none;
  border-radius: 20px;
  color: white;
  cursor: pointer;
  transition: background 0.2s;
}

.message-input button:hover:not(:disabled) {
  background: var(--accent-hover);
}

.message-input button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive */
@media (max-width: 600px) {
  .chat-header {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  .message {
    max-width: 85%;
  }
}