.screen {
  display: flex;
  height: 100vh;
}

.auth-screen {
  justify-content: center;
  align-items: center;
  background: var(--bg-color);
}

.auth-form {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.auth-form h2 {
  font-weight: 500;
  font-size: 1.5rem;
  text-align: center;
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
}

.auth-form input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

.auth-form button {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 0.3rem;
}

.auth-form button:hover { 
  background: var(--primary-dark); 
}

.auth-form hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.5rem 0;
}

.auth-form .toggle-link {
  color: var(--primary);
  text-align: center;
  cursor: pointer;
  font-size: 0.9rem;
}

.auth-form .toggle-link:hover { 
  text-decoration: underline; 
}

.chat-screen {
  flex-direction: row;
  height: 100vh;
}

.sidebar {
  width: 320px;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}

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

.sidebar-header h1 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-dark);
}

.sidebar-actions {
  display: flex;
  gap: 0.5rem;
}

.sidebar-actions button {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s;
}

.sidebar-actions button:hover { 
  background: var(--primary-dark); 
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
}

.chat-item {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
}

.chat-item:hover { 
  background: rgba(0,0,0,0.03); 
}

.chat-item.active { 
  background: var(--primary-dark);
  border-left: 4px solid var(--primary);
  padding-left: calc(1rem - 4px);
  color: white;
}

.chat-item.active .name,
.chat-item.active .last-message {
  color: white;
}

.chat-item .name {
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.chat-item .last-message {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--white);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.message {
  max-width: 70%;
  padding: 0.6rem 1rem;
  border-radius: 12px;
  position: relative;
  line-height: 1.4;
}

.message.own {
  align-self: flex-end;
  background: var(--message-own);
  color: var(--message-own-text);
}
.message.other {
  align-self: flex-start;
  background: var(--message-other);
  color: var(--text-color);
}

.message .sender {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--primary-dark);
  margin-bottom: 0.2rem;
}

.message .text {
  word-wrap: break-word;
}

.message .time {
  font-size: 0.75rem;
  color: #999;
  margin-top: 0.3rem;
  text-align: right;
}

.input-area {
  display: flex;
  padding: 1rem;
  border-top: 1px solid var(--border);
  gap: 0.5rem;
  background: var(--input-bg);
}

.input-area input {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

.input-area button {
  padding: 0.75rem 1.5rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
}

.input-area button:hover { 
  background: var(--primary-dark); 
}

.notification-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.notification {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  color: white;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  max-width: 350px;
  animation: slideIn 0.3s ease-out;
}

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

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

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

@keyframes slideIn {
  from { 
    transform: translateX(100%); 
    opacity: 0; 
  }

  to { 
    transform: translateX(0); 
    opacity: 1; 
  }
}

.hidden { 
  display: none !important; 
}

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

#chat-header h2 { 
  font-weight: 500;
  color: var(--text-color);
}

.group-actions button {
  margin-left: 0.5rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  font-size: 0.85rem;
}

.message-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.message-actions button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.2s;
  color: var(--text-secondary);
}

.message-actions button:hover {
  background: rgba(255, 255, 255, 0.1);
}

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

#chat-header h2 { 
  font-weight: 500; 
}

.group-actions button {
  margin-left: 0.5rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  font-size: 0.85rem;
}

#logout-btn {
  background: #e0e0e0;
  color: #333;
}

#logout-btn:hover {
  background: #ccc;
}

#theme-toggle {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.3rem;
  color: var(--text-color);
  transition: color 0.2s;
}
#theme-toggle:hover {
  color: var(--primary);
}