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

    body {
      background: linear-gradient(135deg, #1a2a6c, #2c3e50);
      color: #fff;
      min-height: 100vh;
      padding-bottom: 40px;
      line-height: 1.6;
    }

    .navbar {
      background: rgba(0, 0, 0, 0.7);
      backdrop-filter: blur(10px);
      padding: 15px 40px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .logo {
      display: flex;
      align-items: center;
      text-decoration: none;
      color: #4fc3f7;
      font-weight: bold;
      font-size: 1.5rem;
    }

    .logo i {
      margin-right: 10px;
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 25px;
    }

    .nav-links a {
      display: flex;
      align-items: center;
      text-decoration: none;
      color: #e0e0e0;
      font-size: 1rem;
      transition: color 0.3s;
    }

    .nav-links a:hover {
      color: #4fc3f7;
    }

    .nav-links a i {
      margin-right: 8px;
    }

    .language-switcher {
      display: flex;
      gap: 10px;
      margin-left: 20px;
    }

    .lang-btn {
      background: rgba(79, 195, 247, 0.2);
      color: #4fc3f7;
      border: none;
      border-radius: 20px;
      padding: 8px 15px;
      cursor: pointer;
      transition: all 0.3s;
      font-weight: 500;
    }

    .lang-btn:hover {
      background: rgba(79, 195, 247, 0.4);
    }

    .lang-btn.active {
      background: #4fc3f7;
      color: #1a2a6c;
    }

    .container {
      max-width: 1200px;
      margin: 30px auto;
      padding: 0 20px;
    }

    .card {
      background: rgba(255, 255, 255, 0.05);
      border-radius: 15px;
      padding: 25px;
      margin-bottom: 25px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      transition:
        transform 0.3s,
        box-shadow 0.3s;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    }

    .card-title {
      display: flex;
      align-items: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      color: #4fc3f7;
      padding-bottom: 15px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .card-title i {
      margin-right: 12px;
      font-size: 1.5rem;
    }

    .section-title {
      font-size: 1.2rem;
      margin: 25px 0 15px;
      color: #4fc3f7;
      display: flex;
      align-items: center;
    }

    .section-title i {
      margin-right: 10px;
    }

    .content-section {
      margin-bottom: 30px;
    }

    .content-section h3 {
      margin-bottom: 15px;
      color: #64b5f6;
      display: flex;
      align-items: center;
    }

    .content-section h3 i {
      margin-right: 10px;
      font-size: 1.2rem;
    }

    .content-section p {
      margin-bottom: 15px;
      color: #e0e0e0;
      line-height: 1.7;
    }

    .code-block {
      background: rgba(0, 0, 0, 0.2);
      border-radius: 8px;
      padding: 15px;
      margin: 15px 0;
      font-family: 'Courier New', monospace;
      overflow-x: auto;
      border-left: 3px solid #4fc3f7;
    }

    .code-block code {
      color: #e0e0e0;
      display: block;
      white-space: pre;
      line-height: 1.5;
    }

    .code-comment {
      color: #81c784;
    }

    .code-keyword {
      color: #f48fb1;
    }

    .code-class {
      color: #90caf9;
    }

    .code-string {
      color: #ffcc80;
    }

    .code-annotation {
      color: #ba68c8;
    }

    .table-container {
      overflow-x: auto;
      margin: 20px 0;
    }

    .config-table {
      width: 100%;
      border-collapse: collapse;
      border-radius: 8px;
      overflow: hidden;
    }

    .config-table th {
      background: rgba(79, 195, 247, 0.2);
      padding: 12px 15px;
      text-align: left;
      font-weight: 600;
    }

    .config-table td {
      padding: 12px 15px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .config-table tr:last-child td {
      border-bottom: none;
    }

    .config-table tr:hover {
      background: rgba(255, 255, 255, 0.05);
    }

    .note-box {
      background: rgba(255, 243, 157, 0.1);
      border-left: 3px solid #ffd54f;
      padding: 15px;
      margin: 20px 0;
      border-radius: 0 8px 8px 0;
    }

    .note-box i {
      color: #ffd54f;
      margin-right: 10px;
    }

    .tip-box {
      background: rgba(129, 199, 132, 0.1);
      border-left: 3px solid #81c784;
      padding: 15px;
      margin: 20px 0;
      border-radius: 0 8px 8px 0;
    }

    .tip-box i {
      color: #81c784;
      margin-right: 10px;
    }

    .annotation-diagram {
      background: rgba(0, 0, 0, 0.15);
      padding: 20px;
      border-radius: 10px;
      margin: 20px 0;
      position: relative;
    }

    .diagram-title {
      text-align: center;
      margin-bottom: 20px;
      color: #4fc3f7;
    }

    .diagram-content {
      display: column;
      justify-content: space-around;
      flex-wrap: wrap;
    }

    .diagram-box {
      background: rgba(79, 195, 247, 0.1);
      border: 1px solid rgba(79, 195, 247, 0.3);
      border-radius: 8px;
      padding: 15px;
      min-width: 250px;
      margin: 10px;
      position: relative;
    }

    .diagram-box h4 {
      color: #4fc3f7;
      margin-bottom: 10px;
      text-align: center;
    }

    .diagram-box ul {
      list-style: none;
    }

    .diagram-box li {
      padding: 5px 0;
      display: flex;
      align-items: center;
    }

    .diagram-box li i {
      margin-right: 8px;
      color: #81c784;
    }

.arrow {
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 2rem;
      color: #ff6b6b;
      animation: pulse 1.5s infinite;
      height: 40px;
      transform: rotate(0deg) !important;
    }

    .annotation-class {
      margin-top: 30px;
      border: 1px solid rgba(79, 195, 247, 0.3);
      border-radius: 10px;
      padding: 20px;
      background: rgba(0, 0, 0, 0.1);
    }

    .annotation-header {
      display: flex;
      align-items: center;
      margin-bottom: 15px;
    }

    .annotation-header i {
      font-size: 24px;
      color: #ba68c8;
      margin-right: 10px;
    }

    .annotation-header h3 {
      color: #ba68c8;
    }

@media (max-width: 600px) {
      .diagram-box {
        padding: 20px 15px;
      }
      
      .diagram-title {
        font-size: 1.5rem;
      }
      
      .diagram-box h4 {
        font-size: 1.2rem;
      }
      
      .diagram-box li {
        font-size: 1rem;
      }
      
      .arrow {
        font-size: 1.8rem;
      }
    }