* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Comic Sans MS', '微软雅黑', sans-serif;
        }
        
        body {
            background-color: #f0f9ff;
            color: #333;
            line-height: 1.6;
            padding-bottom: 50px;
            background-image: 
                radial-gradient(#b3e5fc 2px, transparent 2px),
                radial-gradient(#b3e5fc 2px, transparent 2px);
            background-size: 50px 50px;
            background-position: 0 0, 25px 25px;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: linear-gradient(135deg, #4fc3f7 0%, #29b6f6 100%);
            color: white;
            padding: 25px 0;
            border-radius: 0 0 25px 25px;
            box-shadow: 0 5px 15px rgba(79, 195, 247, 0.3);
            position: relative;
            overflow: hidden;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo i {
            font-size: 3.5rem;
            margin-right: 20px;
            color: #ffde59;
            text-shadow: 2px 2px 0 #ffb74d;
            animation: float 3s ease-in-out infinite;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }
        
        .logo-text h1 {
            font-size: 2.5rem;
            margin-bottom: 5px;
            text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.1);
        }
        
        .logo-text p {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        
        .class-info {
            background-color: rgba(255, 255, 255, 0.25);
            padding: 10px 20px;
            border-radius: 15px;
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        
        .decoration {
            position: absolute;
            z-index: 1;
        }
        
        .decoration.cpu {
            top: 10px;
            right: 10px;
            font-size: 5rem;
            color: rgba(255, 255, 255, 0.15);
        }
        
        .decoration.code {
            bottom: 10px;
            left: 10px;
            font-size: 4rem;
            color: rgba(255, 255, 255, 0.15);
        }
        
        .welcome-section {
            text-align: center;
            margin: 50px 0 40px;
            padding: 30px;
            background-color: white;
            border-radius: 25px;
            box-shadow: 0 10px 25px rgba(41, 182, 246, 0.1);
            animation: fadeIn 0.8s ease;
            border: 2px solid #e1f5fe;
        }
        
        .welcome-title {
            color: #0288d1;
            font-size: 2.2rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
        }
        
        .welcome-title i {
            color: #ffb74d;
        }
        
        .welcome-text {
            font-size: 1.2rem;
            color: #546e7a;
            max-width: 800px;
            margin: 0 auto 20px;
            line-height: 1.8;
        }
        
        .links-section {
            margin: 50px 0;
        }
        
        .section-title {
            color: #0288d1;
            font-size: 2rem;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px dashed #4fc3f7;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .section-title i {
            color: #ffb74d;
        }
        
        .links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
        }
        
        .link-card {
            background-color: white;
            border-radius: 20px;
            padding: 25px;
            box-shadow: 0 8px 20px rgba(79, 195, 247, 0.1);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            border: 2px solid #e1f5fe;
            display: block;
            text-decoration: none;
            color: inherit;
        }
        
        .link-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(79, 195, 247, 0.2);
            border-color: #4fc3f7;
            background-color: #f8fdff;
        }
        
        .link-card:nth-child(1):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(2):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(3):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(4):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(5):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(6):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(7):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(8):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(9):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:nth-child(10):hover {
            border-color: #80deea;
            background-color: #f1f9ff;
        }
        
        .link-card:before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, #4fc3f7, #b3e5fc);
        }
        
        .link-card:nth-child(1):before {
            background: linear-gradient(90deg, #4fc3f7, #b3e5fc);
        }
        
        .link-card:nth-child(2):before {
            background: linear-gradient(90deg, #29b6f6, #81d4fa);
        }
        
        .link-card:nth-child(3):before {
            background: linear-gradient(90deg, #0288d1, #4fc3f7);
        }
        
        .link-card:nth-child(4):before {
            background: linear-gradient(90deg, #0277bd, #29b6f6);
        }
        
        .link-card:nth-child(5):before {
            background: linear-gradient(90deg, #01579b, #0288d1);
        }
        
        .link-card:nth-child(6):before {
            background: linear-gradient(90deg, #80deea, #b2ebf2);
        }
        
        .link-card:nth-child(7):before {
            background: linear-gradient(90deg, #26c6da, #80deea);
        }
        
        .link-card:nth-child(8):before {
            background: linear-gradient(90deg, #00bcd4, #26c6da);
        }
        
        .link-card:nth-child(9):before {
            background: linear-gradient(90deg, #0097a7, #00bcd4);
        }
        
        .link-card:nth-child(10):before {
            background: linear-gradient(90deg, #00838f, #0097a7);
        }
        
        .link-icon {
            font-size: 2.5rem;
            margin-bottom: 15px;
            display: inline-block;
            width: 70px;
            height: 70px;
            line-height: 70px;
            text-align: center;
            border-radius: 50%;
            color: white;
            background: linear-gradient(135deg, #4fc3f7, #29b6f6);
            box-shadow: 0 5px 15px rgba(79, 195, 247, 0.3);
        }
        
        .link-card:nth-child(1) .link-icon {
            background: linear-gradient(135deg, #4fc3f7, #29b6f6);
        }
        
        .link-card:nth-child(2) .link-icon {
            background: linear-gradient(135deg, #29b6f6, #0288d1);
        }
        
        .link-card:nth-child(3) .link-icon {
            background: linear-gradient(135deg, #0288d1, #0277bd);
        }
        
        .link-card:nth-child(4) .link-icon {
            background: linear-gradient(135deg, #0277bd, #01579b);
        }
        
        .link-card:nth-child(5) .link-icon {
            background: linear-gradient(135deg, #01579b, #004c8c);
        }
        
        .link-card:nth-child(6) .link-icon {
            background: linear-gradient(135deg, #80deea, #26c6da);
        }
        
        .link-card:nth-child(7) .link-icon {
            background: linear-gradient(135deg, #26c6da, #00bcd4);
        }
        
        .link-card:nth-child(8) .link-icon {
            background: linear-gradient(135deg, #00bcd4, #0097a7);
        }
        
        .link-card:nth-child(9) .link-icon {
            background: linear-gradient(135deg, #0097a7, #00838f);
        }
        
        .link-card:nth-child(10) .link-icon {
            background: linear-gradient(135deg, #00838f, #006064);
        }
        
        .link-title {
            font-size: 1.4rem;
            margin-bottom: 10px;
            color: #0277bd;
        }
        
        .link-desc {
            color: #546e7a;
            font-size: 1rem;
            line-height: 1.5;
            margin-bottom: 15px;
        }
        
        .link-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.9rem;
            color: #78909c;
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px dashed #e1f5fe;
        }
        
        .teacher-section {
            background-color: white;
            border-radius: 25px;
            padding: 30px;
            margin: 50px 0;
            box-shadow: 0 10px 25px rgba(41, 182, 246, 0.1);
            text-align: center;
            border: 2px solid #e1f5fe;
        }
        
        .teacher-title {
            color: #0288d1;
            font-size: 1.8rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        
        .teacher-info {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
        }
        
        .teacher-avatar {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: linear-gradient(135deg, #b3e5fc, #4fc3f7);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3.5rem;
            color: white;
            border: 5px solid #29b6f6;
            margin-bottom: 15px;
            box-shadow: 0 5px 15px rgba(79, 195, 247, 0.3);
        }
        
        .teacher-text {
            font-size: 1.1rem;
            color: #546e7a;
            max-width: 800px;
            line-height: 1.8;
        }
        
        .teacher-text strong {
            color: #0288d1;
        }
        
        .character {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 100px;
            height: 120px;
            z-index: 100;
            pointer-events: none;
        }
        
        .character-body {
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 80px;
            background: linear-gradient(to top, #4fc3f7, #29b6f6);
            border-radius: 30px 30px 0 0;
        }
        
        .character-head {
            position: absolute;
            bottom: 80px;
            left: 50%;
            transform: translateX(-50%);
            width: 70px;
            height: 70px;
            background-color: #ffde59;
            border-radius: 50%;
        }
        
        .character-eye {
            position: absolute;
            top: 20px;
            width: 10px;
            height: 10px;
            background-color: #333;
            border-radius: 50%;
        }
        
        .character-eye.left {
            left: 20px;
        }
        
        .character-eye.right {
            right: 20px;
        }
        
        .character-mouth {
            position: absolute;
            bottom: 15px;
            left: 50%;
            transform: translateX(-50%);
            width: 30px;
            height: 10px;
            background-color: #333;
            border-radius: 0 0 10px 10px;
        }
        
        footer {
            text-align: center;
            margin-top: 50px;
            padding-top: 20px;
            border-top: 2px dashed #4fc3f7;
            color: #546e7a;
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin: 20px 0;
        }
        
        .footer-link {
            color: #0288d1;
            text-decoration: none;
            font-weight: bold;
            transition: color 0.3s ease;
        }
        
        .footer-link:hover {
            color: #ffb74d;
            text-decoration: underline;
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
                gap: 20px;
            }
            
            .links-container {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
            
            .character {
                display: none;
            }
            
            .welcome-title {
                font-size: 1.8rem;
                flex-direction: column;
                gap: 10px;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
        }
        
        @media (max-width: 480px) {
            .links-container {
                grid-template-columns: 1fr;
            }
            
            .logo-text h1 {
                font-size: 1.8rem;
            }
            
            .logo i {
                font-size: 2.5rem;
                margin-right: 10px;
            }
        }
 /* 页脚导航链接样式 */
    .footer-nav {
      margin: 15px 0;
      text-align: center;
    }
    .footer-nav a {
      color: #17a2b8;
      text-decoration: none;
      margin: 0 15px;
      padding: 5px 10px;
      border-radius: 4px;
      transition: all 0.3s;
    }
    .footer-nav a:hover {
      background-color: #e8f4f8;
      color: #0c7b8c;
    }
    .footer-nav a i {
      margin-right: 5px;
    }