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

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #00ff00;
  --text-secondary: #00cc00;
  --text-muted: #008800;
  --border-color: #00ff00;
  --accent: #00ff00;
  --error: #ff0000;
}

body {
  font-family: 'Courier New', 'Courier', monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow: hidden;
}

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

/* Auth Screen */
#auth-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 20px;
  text-align: center;
}

.logo pre {
  color: var(--text-primary);
  font-size: 0.8em;
  line-height: 1.2;
  margin-bottom: 20px;
}

#auth-screen h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.tagline {
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 0.9em;
}

.info {
  margin-top: 40px;
  color: var(--text-muted);
  font-size: 0.85em;
  max-width: 400px;
}

.info p {
  margin: 5px 0;
}

/* Buttons */
button {
  font-family: 'Courier New', 'Courier', monospace;
  font-size: 1em;
  cursor: pointer;
  border: 2px solid var(--border-color);
  padding: 12px 24px;
  transition: all 0.2s;
}

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

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

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

.secondary-btn:hover {
  background: var(--bg-tertiary);
}

.icon {
  margin-right: 8px;
}

/* Chat Screen */
#chat-screen {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

#header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-secondary);
}

.header-left h2 {
  font-size: 1.2em;
  display: inline;
  margin-right: 20px;
}

#user-info {
  color: var(--text-muted);
  font-size: 0.9em;
}

/* Room Input Screen */
#room-input-screen {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.room-input-container {
  text-align: center;
  max-width: 400px;
  width: 100%;
  padding: 20px;
}

.room-input-container h3 {
  margin-bottom: 20px;
  font-size: 1.5em;
}

#room-name {
  width: 100%;
  margin-bottom: 15px;
}

.hint {
  margin-top: 15px;
  color: var(--text-muted);
  font-size: 0.85em;
}

/* Chat Container */
#chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#room-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 15px;
  background: #1a1a1a;
  border-bottom: 1px solid #00ff00;
  gap: 15px;
}

.room-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

#switch-room-name {
  background: #000;
  border: 1px solid #00ff00;
  color: #00ff00;
  padding: 6px 10px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  width: 150px;
}

#switch-room-name:focus {
  outline: none;
  border-color: #00ff00;
  box-shadow: 0 0 5px rgba(0, 255, 0, 0.3);
}

#current-room {
  font-weight: bold;
  color: var(--text-primary);
}

#peer-count {
  color: var(--text-muted);
  margin-left: 20px;
}

#chat-main {
  flex: 1;
  display: grid;
  grid-template-columns: 200px 1fr;
  overflow: hidden;
}

/* User List */
#user-list {
  border-right: 2px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.user-list-header {
  padding: 10px;
  border-bottom: 2px solid var(--border-color);
  font-weight: bold;
  text-transform: uppercase;
  font-size: 0.9em;
}

#user-list-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.user-item {
  padding: 5px;
  margin: 2px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-avatar {
  width: 20px;
  height: 20px;
  border-radius: 2px;
  border: 1px solid var(--border-color);
}

.user-name {
  font-size: 0.9em;
}

.user-name.self {
  color: var(--accent);
  font-weight: bold;
}

/* Messages */
#messages-container {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 15px;
  background: var(--bg-primary);
}

.message {
  margin: 8px 0;
  display: flex;
  gap: 10px;
  font-size: 0.95em;
}

.message-time {
  color: var(--text-muted);
  font-size: 0.85em;
  min-width: 50px;
}

.message-author {
  color: var(--text-secondary);
  font-weight: bold;
  min-width: 120px;
}

.message-author.self {
  color: var(--accent);
}

.message-text {
  color: var(--text-primary);
  word-wrap: break-word;
  flex: 1;
}

.system-message {
  color: var(--text-muted);
  font-style: italic;
  margin: 5px 0;
  text-align: center;
}

/* Input Area */
#input-area {
  display: flex;
  gap: 10px;
  padding: 15px;
  border-top: 2px solid var(--border-color);
  background: var(--bg-secondary);
}

input[type="text"] {
  flex: 1;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  padding: 10px;
  font-family: 'Courier New', 'Courier', monospace;
  font-size: 1em;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border: 2px solid var(--bg-secondary);
}

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

/* Responsive */
@media (max-width: 768px) {
  #chat-main {
    grid-template-columns: 1fr;
  }
  
  #user-list {
    display: none;
  }
  
  #auth-screen h1 {
    font-size: 1.8em;
  }
  
  .logo pre {
    font-size: 0.6em;
  }
}