/* 基础变量 */
:root {
  --primary-color: #6e48aa;
  --primary-light: #9d50bb;
  --secondary-color: #4776e6;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --bg-color: #f8f9fa;
  --bg-elevated: #ffffff;
  --border-color: #e2e8f0;
  --user-bubble: #edf2f7;
  --ai-bubble: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* 动画定义 */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes typing {
  0% { opacity: 0.4; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-3px); }
  100% { opacity: 0.4; transform: translateY(0); }
}

/* 主容器 */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: var(--bg-color);
  position: relative;
  overflow: hidden;
}

/* 顶部导航栏 */
.chat-header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  padding: 0.75rem 1.5rem;
  box-shadow: var(--shadow-md);
  z-index: 10;

  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
  }

  .ai-identity {
    display: flex;
    align-items: center;
    gap: 0.75rem;

    h1 {
      font-size: 1.25rem;
      font-weight: 600;
      margin: 0;
    }
  }

  .avatar-pulse {
    position: relative;
    
    .avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background-color: white;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      z-index: 2;
      position: relative;
    }

    .pulse-ring {
      position: absolute;
      top: -4px;
      left: -4px;
      right: -4px;
      bottom: -4px;
      background: rgba(255,255,255,0.3);
      border-radius: 50%;
      z-index: 1;
      opacity: 0;
      transition: opacity 0.3s ease;

      &.active {
        opacity: 1;
        animation: pulse 2s infinite;
      }
    }
  }

  .status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    background: rgba(255,255,255,0.15);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    transition: all 0.3s ease;

    &.error {
      background: rgba(239, 68, 68, 0.2);
      color: #fef2f2;
    }

    &.loading {
      .status-light {
        animation: pulse 1.5s infinite;
      }
    }

    .status-light {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #4ade80;

      .error & {
        background: #ef4444;
      }

      .loading & {
        background: #fbbf24;
      }
    }
  }
}

/* 消息区域 */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;

  .message-wrapper {
    &.new-group {
      margin-top: 1.25rem;
      position: relative;

      &::before {
        content: '';
        position: absolute;
        top: -0.75rem;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
        height: 1px;
        background: var(--border-color);
        opacity: 0.6;
      }
    }
  }

  .message {
    max-width: 85%;
    margin: 0 auto;
    animation: fadeIn 0.3s ease-out forwards;
    opacity: 0;

    &.user {
      margin-left: auto;
      margin-right: 0;

      .message-content {
        flex-direction: row-reverse;
      }

      .message-bubble {
        background-color: var(--user-bubble);
        border-top-right-radius: 4px;
      }
    }

    &.assistant {
      margin-left: 0;
      margin-right: auto;

      .message-bubble {
        background-color: var(--ai-bubble);
        border-top-left-radius: 4px;
        box-shadow: var(--shadow-sm);
      }
    }

    .message-content {
      display: flex;
      gap: 0.75rem;
      align-items: flex-end;
    }

    .avatar-container {
      .avatar {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.75rem;
        font-weight: bold;
        flex-shrink: 0;

        &.user {
          background: var(--text-secondary);
        }
      }
    }

    .bubble-container {
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
      flex: 1;
      min-width: 0;
    }

    .message-bubble {
      padding: 0.75rem 1rem;
      border-radius: var(--radius-md);
      line-height: 1.5;
      word-wrap: break-word;
      position: relative;
      transition: transform 0.2s ease;

      &:hover {
        .message-actions {
          opacity: 1;
        }
      }
    }

    .message-actions {
      position: absolute;
      right: 0;
      top: -24px;
      display: flex;
      gap: 0.25rem;
      background: white;
      padding: 0.25rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    .action-button {
      width: 24px;
      height: 24px;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: none;
      border: none;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s ease;

      &:hover {
        background: var(--bg-color);
        color: var(--primary-color);
      }
    }

    .timestamp {
      font-size: 0.75rem;
      color: var(--text-secondary);
      padding: 0 0.5rem;
    }

    .typing-indicator {
      display: flex;
      gap: 0.25rem;
      padding: 0.5rem 0;

      .dot {
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background-color: var(--text-secondary);
        opacity: 0.4;
        animation: typing 1.4s infinite ease-in-out;

        &:nth-child(1) { animation-delay: 0s; }
        &:nth-child(2) { animation-delay: 0.2s; }
        &:nth-child(3) { animation-delay: 0.4s; }
      }
    }
  }
}

/* 输入区域 */
.chat-input-container {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-color);
  padding: 1rem;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;

  .input-tools {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
  }

  .tool-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;

    &:hover {
      background: var(--bg-color);
      color: var(--primary-color);
    }
  }

  .input-wrapper {
    display: flex;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    overflow: hidden;

    &.focused {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 1px var(--primary-color);
    }

    textarea {
      flex: 1;
      border: none;
      padding: 0.75rem 1rem;
      resize: none;
      max-height: 150px;
      min-height: 44px;
      font-family: inherit;
      line-height: 1.5;
      background: transparent;
      color: var(--text-primary);

      &:focus {
        outline: none;
      }

      &::placeholder {
        color: var(--text-secondary);
        opacity: 0.6;
      }
    }

    .input-actions {
      display: flex;
      align-items: flex-end;
      padding: 0 0.5rem 0.5rem;
    }

    .send-button {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--primary-color);
      border: none;
      color: white;
      cursor: pointer;
      transition: all 0.2s ease;
      position: relative;
      overflow: hidden;

      &:disabled {
        background: var(--border-color);
        cursor: not-allowed;

        svg {
          opacity: 0.5;
        }
      }

      &:not(:disabled):hover {
        background: var(--primary-light);
        transform: translateY(-2px);
      }

      &.loading {
        background: var(--border-color);
      }

      svg {
        transition: all 0.2s ease;

        &.active {
          color: white;
        }
      }

      .spinner {
        width: 20px;
        height: 20px;
        border: 2px solid rgba(255,255,255,0.3);
        border-radius: 50%;
        border-top-color: white;
        animation: spin 1s ease-in-out infinite;
      }
    }
  }
}

/* 历史面板 */
.history-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border-color);
  z-index: 20;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 12px rgba(0,0,0,0.05);
  transform: translateX(100%);
  animation: slideIn 0.3s ease-out forwards;

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

    h3 {
      margin: 0;
      font-size: 1rem;
      color: var(--text-primary);
    }

    .close-button {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      background: none;
      border: none;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s ease;

      &:hover {
        background: var(--bg-color);
      }
    }
  }

  .history-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
  }

  .history-item {
    padding: 0.75rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;

    &:hover {
      background: var(--bg-color);
    }

    .item-content {
      font-size: 0.875rem;
      color: var(--text-primary);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-bottom: 0.25rem;
    }

    .item-time {
      font-size: 0.75rem;
      color: var(--text-secondary);
    }
  }
}

/* 动画定义 */
@keyframes slideIn {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 响应式调整 */
@media (max-width: 768px) {
  .chat-messages {
    padding: 1rem;

    .message {
      max-width: 90%;
    }
  }

  .history-panel {
    width: 280px;
  }
}
.action-button {
  font-size: 1.2em;
  line-height: 1;
}
.send-button {
  font-size: 1.5em;
}