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

:root {
  --bg-primary: #0f1923;
  --bg-secondary: #152231;
  --bg-tertiary: #1a2d40;
  --text-primary: #e8edf2;
  --text-secondary: #7a8fa3;
  --accent: #4dd9d0;
  --accent-hover: #6fe8e0;
  --accent-glow: rgba(77, 217, 208, 0.15);
  --user-msg-bg: #1a3a4a;
  --claude-msg-bg: #18283a;
  --border-color: #243447;
  --success: #4dd9d0;
  --warning: #f0c050;
  --error: #ef5f5f;
  --leaf-green: #7cc98e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 900px;
  margin: 0 auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.875rem 1.5rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, #142a3a 100%);
  border-bottom: 1px solid var(--border-color);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.header-logo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.logout-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, border-color 0.2s;
}

.logout-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--warning);
  animation: pulse 2s infinite;
}

.status-dot.online {
  background-color: var(--success);
}

.status-dot.offline {
  background-color: var(--error);
  animation: none;
}

.status-dot.busy {
  background-color: var(--warning);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.chat-container {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

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

.message {
  max-width: 80%;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--user-msg-bg) 0%, #1a4555 100%);
  border-bottom-right-radius: 0.25rem;
  border: 1px solid rgba(77, 217, 208, 0.1);
}

.message.claude {
  align-self: flex-start;
  background-color: var(--claude-msg-bg);
  border-bottom-left-radius: 0.25rem;
  border: 1px solid var(--border-color);
}

.message.claude::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  margin-right: 0;
  position: absolute;
  top: 0.875rem;
  left: -8px;
}

.message.claude {
  position: relative;
}

.message .meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.message.sending {
  opacity: 0.7;
}

.input-area {
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

#message-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

#message-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  outline: none;
  transition: border-color 0.2s;
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

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

#send-button {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background-color: var(--accent);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, transform 0.1s;
}

#send-button:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 0 12px var(--accent-glow);
}

#send-button:active {
  transform: scale(0.95);
}

#send-button:disabled {
  background-color: var(--text-secondary);
  cursor: not-allowed;
}

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

.empty-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, #1a3a4a 0%, var(--bg-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
  border: 2px solid var(--border-color);
  box-shadow: 0 0 30px var(--accent-glow);
  overflow: hidden;
}

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

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

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

/* Scrollbar styling */
.messages::-webkit-scrollbar {
  width: 8px;
}

.messages::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

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

.messages::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Login screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: radial-gradient(ellipse at 50% 40%, #142a3a 0%, var(--bg-primary) 70%);
}

.login-box {
  text-align: center;
  padding: 2.5rem 2rem 2rem;
  background: linear-gradient(160deg, var(--bg-secondary) 0%, #142a3a 100%);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  width: 340px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 60px var(--accent-glow);
}

.login-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: radial-gradient(circle, #1a3a4a 0%, var(--bg-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  border: 2px solid var(--border-color);
  box-shadow: 0 0 20px var(--accent-glow);
  overflow: hidden;
}

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

.login-box h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
  color: var(--accent);
}

.login-box p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.login-box input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  margin-bottom: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.login-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.login-box button {
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: 0.75rem;
  background-color: var(--accent);
  color: #0f1923;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s;
}

.login-box button:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 0 16px var(--accent-glow);
}

.login-error {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: 0.75rem;
  min-height: 1.25rem;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
  .message {
    max-width: 90%;
  }

  header h1 {
    font-size: 1rem;
  }

  .status-text {
    display: none;
  }
}