/* チャット機能共通スタイル */
.chat-message {
    position: relative;
    margin-bottom: 8px;
    transition: transform 0.2s;
    margin-left: 20px;
}

.chat-message:hover {
  transform: translateY(-2px);
}

.message-header {
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.username {
  font-weight: 600;
  color: var(--primary-color);
}

.message-time {
  color: #777;
  font-size: 0.75rem;
}

.message-content {
  word-break: break-word;
  line-height: 1.5;
}

/* システムメッセージ特有のスタイル */
.system-message {
  text-align: center;
  background-color: rgba(0, 0, 0, 0.05) !important;
  padding: 6px 12px !important;
  border-radius: 20px !important;
  font-size: 0.8rem !important;
}

.system-text {
  color: #666;
  font-style: italic;
}

/* チャット入力フォーム共通スタイル */
.chat-input-form {
  background-color: white;
  border-top: 1px solid #eee;
}

.input-group {
  position: relative;
}

.input-group input {
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.send-btn {
  position: relative;
  overflow: hidden;
}

.send-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%);
  transform-origin: 50% 50%;
}

.send-btn:focus:not(:active)::after {
  animation: ripple 0.6s ease-out;
}

@keyframes ripple {
  0% {
    transform: scale(0, 0);
    opacity: 0.5;
  }
  20% {
    transform: scale(25, 25);
    opacity: 0.3;
  }
  100% {
    opacity: 0;
    transform: scale(40, 40);
  }
}

/* チャット活性状態表示 */
.user-count-indicator {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  color: #666;
  transition: color 0.3s;
}

.user-count-indicator.active {
  color: var(--accent-color);
  font-weight: 500;
}

.user-count-indicator i {
  margin-right: 5px;
}