:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --success: #27ae60;
  --success-hover: #2ecc71;
  --error: #e74c3c;
  --bg-color: #f5f7fb;
  --sidebar-bg: linear-gradient(135deg, #3498db, #2c3e50);
  --card-bg: #ffffff;
  --text-color: #2c3e50;
  --text-muted: #7f8c8d;
  --border-color: #ecf0f1;
  --message-received: #f1f5f9;
  --message-sent: #3498db;
  --message-system: #f8fafc;
  --input-bg: #ffffff;
  --scrollbar-track: #f1f1f1;
  --scrollbar-thumb: #bdc3c7;
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --primary: #4ea5e0;
  --primary-dark: #3498db;
  --success: #2ecc71;
  --success-hover: #27ae60;
  --error: #e74c3c;
  --bg-color: #1a1d21;
  --sidebar-bg: linear-gradient(135deg, #2c3e50, #1a1d21);
  --card-bg: #2c3e50;
  --text-color: #ecf0f1;
  --text-muted: #bdc3c7;
  --border-color: #34495e;
  --message-received: #34495e;
  --message-sent: #3498db;
  --message-system: #2c3e50;
  --input-bg: #34495e;
  --scrollbar-track: #2c3e50;
  --scrollbar-thumb: #7f8c8d;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-speed) ease;
  color: var(--text-color);
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  background-color: var(--primary);
  color: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

.sidebar {
  width: 280px;
  background: var(--sidebar-bg);
  color: white;
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-speed) ease;
  z-index: 100;
}

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

  .sidebar {
    width: 100%;
    transform: translateX(-100%);
    position: fixed;
    height: 100%;
    box-shadow: 5px 0 15px rgba(0, 0, 0, 0.1);
  }

  .sidebar.active {
    transform: translateX(0);
  }
}

.logo {
  display: flex;
  align-items: center;
  margin-bottom: 30px;
}

.logo i {
  font-size: 28px;
  margin-right: 10px;
}

.logo h1 {
  font-size: 22px;
  font-weight: 600;
}

.connection-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.connection-form input {
  padding: 12px;
  border-radius: 6px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 14px;
  transition: all 0.2s ease;
}

.connection-form input:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.connection-form input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.button {
  padding: 12px;
  border-radius: 6px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.button i {
  font-size: 16px;
}

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

.connect-btn:hover {
  background: var(--success-hover);
}

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

.reconnect-btn:hover {
  background: var(--primary-dark);
}

.button:disabled {
  background: #95a5a6;
  cursor: not-allowed;
}

.connection-info {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.status {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}

.status-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 8px;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.status-indicator.online {
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.status-indicator.offline {
  background-color: var(--error);
  box-shadow: 0 0 8px var(--error);
}

.server-info {
  font-size: 12px;
  opacity: 0.8;
}

.theme-toggle {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-toggle span {
  font-size: 14px;
}

.theme-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.2);
  transition: 0.3s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--card-bg);
  transition: background-color var(--transition-speed) ease;
}

@media (max-width: 768px) {
  .chat-container {
    width: 100%;
    height: 100vh;
  }
}

.chat-header {
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--card-bg);
  transition: background-color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-color);
  transition: color var(--transition-speed) ease;
}

.messages-container {
  flex: 1;
  padding: 15px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background-color: var(--bg-color);
  transition: background-color var(--transition-speed) ease;
}

@media (max-width: 768px) {
  .messages-container {
    padding: 10px;
  }
}

.welcome-message {
  text-align: center;
  background-color: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: background-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
}

.welcome-message h3 {
  color: var(--text-color);
  margin-bottom: 10px;
  transition: color var(--transition-speed) ease;
}

.welcome-message p {
  color: var(--text-muted);
  transition: color var(--transition-speed) ease;
}

.message {
  padding: 12px 16px;
  border-radius: 8px;
  max-width: 80%;
  word-wrap: break-word;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: background-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
  animation: message-fade-in 0.3s ease-out;
}

@media (max-width: 576px) {
  .message {
    max-width: 90%;
  }
}

@keyframes message-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.received {
  background-color: var(--message-received);
  color: var(--text-color);
  align-self: flex-start;
  border-bottom-left-radius: 0;
}

.message.sent {
  background-color: var(--message-sent);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 0;
}

.message.system {
  background-color: var(--message-system);
  color: var(--text-muted);
  align-self: center;
  font-style: italic;
  font-size: 14px;
  border: 1px solid var(--border-color);
  max-width: 90%;
}

.timestamp {
  font-size: 10px;
  opacity: 0.7;
  align-self: flex-end;
  margin-top: 4px;
}

.username-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  align-self: flex-start;
}

.message-text {
  display: block;
  margin-top: 4px;
  line-height: 1.4;
  word-break: break-word;
}

.input-container {
  display: flex;
  padding: 12px;
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

@media (max-width: 576px) {
  .input-container {
    padding: 8px;
  }
}

.input-container input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  margin-right: 10px;
  font-size: 14px;
  background-color: var(--input-bg);
  color: var(--text-color);
  transition: all 0.2s ease;
}

@media (max-width: 576px) {
  .input-container input {
    padding: 10px 12px;
  }
}

.input-container input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

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

.input-container button {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background-color: var(--primary);
  color: white;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 576px) {
  .input-container button {
    width: 40px;
    height: 40px;
  }
}

.input-container button:hover {
  background-color: var(--primary-dark);
  transform: scale(1.05);
}

.input-container button:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
  transform: none;
}

.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: 8px;
  color: white;
  font-weight: 500;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  animation: notification-slide-in 0.3s ease-out;
  max-width: 300px;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

@media (max-width: 576px) {
  .notification {
    top: 10px;
    right: 10px;
    left: 10px;
    max-width: calc(100% - 20px);
  }
}

@keyframes notification-slide-in {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.notification.error {
  background-color: var(--error);
}

.notification.info {
  background-color: var(--primary);
}

.notification.success {
  background-color: var(--success);
}

.notification.fade-out {
  opacity: 0;
  transform: translateY(-10px);
}


::-webkit-scrollbar {
  width: 6px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: #95a5a6;
}

@media (max-width: 768px) and (orientation: landscape) {
  .sidebar {
    height: 100vh;
    overflow-y: auto;
  }

  .chat-container {
    height: 100vh;
  }

  .input-container {
    padding: 8px;
  }

  .messages-container {
    padding: 8px;
  }
}