* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Patrick Hand', cursive;
        }
        
        body {
            background: linear-gradient(135deg, #ffedfa 0%, #c3e6ff 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(255, 200, 124, 0.2) 0px, transparent 50px),
                radial-gradient(circle at 90% 40%, rgba(162, 232, 255, 0.3) 0px, transparent 60px);
        }
        
        .container {
            max-width: 1200px;
            width: 100%;
            background-color: white;
            border-radius: 25px;
            box-shadow: 
                0 15px 35px rgba(0, 0, 0, 0.1),
                0 5px 15px rgba(255, 105, 180, 0.2);
            overflow: hidden;
            border: 8px solid #ff6b9c;
            position: relative;
            margin: 20px;
        }
        
        .container:before {
            content: "";
            position: absolute;
            top: -20px;
            left: -20px;
            right: -20px;
            bottom: -20px;
            background: 
                radial-gradient(circle, #ffd1dc 0%, transparent 70%),
                radial-gradient(circle, #c3e6ff 0%, transparent 80%);
            z-index: -1;
            border-radius: 35px;
        }
        
        /* 卡通风格导航栏 */
        .navbar {
            background: linear-gradient(90deg, #ff6b9c, #ffb347, #ff6b9c);
            color: white;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 90px;
            position: relative;
            border-bottom: 6px dotted white;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
            transform: rotate(-3deg);
            background: rgba(255, 255, 255, 0.3);
            padding: 8px 15px;
            border-radius: 50px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .logo-icon {
            font-size: 32px;
            color: #ffd700;
            text-shadow: 2px 2px 0 #ff6b9c;
            animation: bounce 2s infinite;
        }
        
        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }
        
        .logo-text {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: 1px;
            font-family: 'Comic Neue', cursive;
            text-shadow: 2px 2px 0 #ff6b9c;
        }
        
        .logo span {
            color: #ffd700;
            text-shadow: 2px 2px 0 #ff6b9c;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            position: relative;
        }
        
        .nav-links a {
            color: white;
            text-decoration: none;
            padding: 30px 20px;
            display: block;
            font-weight: 500;
            font-size: 19px;
            transition: all 0.3s ease;
            position: relative;
            font-family: 'Comic Neue', cursive;
            text-shadow: 1px 1px 0 #ff6b9c;
        }
        
        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: scale(1.05);
        }
        
        .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 10%;
            width: 80%;
            height: 4px;
            background: #ffd700;
            border-radius: 2px;
            box-shadow: 0 3px 0 #ff6b9c;
        }
        
        .dropdown {
            position: relative;
        }
        
        .dropdown-content {
            position: absolute;
            background-color: #fff9e6;
            min-width: 240px;
            box-shadow: 0 10px 20px rgba(255, 107, 156, 0.3);
            border-radius: 20px;
            z-index: 1;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.3s ease;
            border: 3px solid #ffb347;
            padding: 10px 0;
        }
        
        .dropdown:hover .dropdown-content {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .dropdown-content a {
            color: #ff6b9c;
            padding: 15px 25px;
            display: block;
            border-bottom: 2px dashed #ffd1dc;
            font-size: 17px;
            font-weight: bold;
            transition: all 0.2s;
        }
        
        .dropdown-content a:hover {
            background-color: #ffebf3;
            color: #ff347c;
            transform: translateX(10px);
            border-radius: 15px;
        }
        
        .action-buttons {
            display: flex;
            gap: 15px;
        }
        
        .btn {
            padding: 12px 25px;
            border-radius: 50px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            font-size: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-family: 'Comic Neue', cursive;
            box-shadow: 0 5px 0 rgba(0, 0, 0, 0.2);
            transform: translateY(0);
            text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.2);
        }
        
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 0 rgba(0, 0, 0, 0.2);
        }
        
        .btn:active {
            transform: translateY(0);
            box-shadow: 0 3px 0 rgba(0, 0, 0, 0.2);
        }
        
        .login-btn {
            background: #4aa8ff;
            color: white;
            border: 3px solid white;
        }
        
        .login-btn:hover {
            background: #3a98ef;
        }
        
        .signup-btn {
            background: #ffd700;
            color: #ff6b9c;
            border: 3px solid white;
        }
        
        .signup-btn:hover {
            background: #ffcc00;
        }
        
        .hamburger {
            display: none;
            cursor: pointer;
            background: transparent;
            border: none;
            font-size: 32px;
            color: white;
            text-shadow: 2px 2px 0 #ff6b9c;
        }
        
        /* 卡通内容区域 */
        .content {
            padding: 50px 40px;
            text-align: center;
        }
        
        .feature-card-link {
            text-decoration: none;
            color: inherit;
            display: block;
            height: 100%;
        }
        
        .feature-card-link:hover {
            color: #ff347c;
        }
        
        img {
            max-width: 100%;
            height: auto;
        }
        
        .content h1 {
            color: #ff6b9c;
            font-size: 3.5rem;
            margin-bottom: 25px;
            font-family: 'Comic Neue', cursive;
            text-shadow: 3px 3px 0 #ffd700;
            letter-spacing: 1px;
            transform: rotate(-2deg);
            background: white;
            display: inline-block;
            padding: 0 25px;
            border-radius: 20px;
            box-shadow: 0 8px 0 #ffd1dc;
            border: 4px solid #ffb347;
        }
        
        .content p {
            color: #5a5a5a;
            font-size: 1.4rem;
            max-width: 800px;
            margin: 0 auto 40px;
            line-height: 1.7;
        }
        
        .features {
            display: flex;
            justify-content: center;
            gap: 35px;
            margin-top: 40px;
            flex-wrap: wrap;
        }
        
        .feature-card {
            background: linear-gradient(135deg, #ffffff, #fff9e6);
            border-radius: 25px;
            padding: 35px;
            width: 280px;
            box-shadow: 
                0 10px 20px rgba(255, 107, 156, 0.2),
                inset 0 0 0 5px #ffd1dc;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
            transform: rotate(0);
        }
        
        .feature-card:hover {
            transform: translateY(-15px) rotate(2deg);
            box-shadow: 0 15px 30px rgba(255, 107, 156, 0.3);
        }
        
        .feature-card:before {
            content: "";
            position: absolute;
            top: -10px;
            left: -10px;
            right: -10px;
            bottom: -10px;
            background: 
                radial-gradient(circle at top left, #ffd1dc, transparent 70%),
                radial-gradient(circle at bottom right, #c3e6ff, transparent 70%);
            z-index: -1;
            border-radius: 30px;
        }
        
        .feature-card i {
            font-size: 60px;
            color: #ff6b9c;
            margin-bottom: 25px;
            text-shadow: 3px 3px 0 #ffd1dc;
            animation: float 4s infinite ease-in-out;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-15px); }
        }
        
        .feature-card h3 {
            color: #ff6b9c;
            margin-bottom: 20px;
            font-size: 1.8rem;
            font-family: 'Comic Neue', cursive;
            text-shadow: 1px 1px 0 #ffd1dc;
        }
        
        .feature-card p {
            color: #7a7a7a;
            font-size: 1.1rem;
            background: none;
            padding: 0;
            border: none;
            line-height: 1.6;
        }
        
		
        /* 新增：教学空间背景图样式 */
        
        .feature-card.environment-card {
            background: linear-gradient(rgba(255, 255, 255, 0.55), rgba(255, 249, 230, 0.95)), 
                         url('sucai/微信图片_20250620202056.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
        }
        
        /* 新增：排行榜样式 */
        .rankings {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin: 40px auto;
            flex-wrap: wrap;
            max-width: 1200px;
        }
        
        .ranking-card {
            background: linear-gradient(135deg, #fff9e6, #ffffff);
            border-radius: 25px;
            padding: 25px;
            width: 320px;
            box-shadow: 
                0 10px 25px rgba(255, 107, 156, 0.2),
                inset 0 0 0 5px #c3e6ff;
            position: relative;
            overflow: hidden;
            transform: rotate(-1deg);
            transition: all 0.3s ease;
        }
        
        .ranking-card:hover {
            transform: rotate(0) scale(1.03);
            box-shadow: 0 15px 35px rgba(255, 107, 156, 0.3);
        }
        
        .ranking-card h2 {
            color: #ff6b9c;
            font-size: 2.2rem;
            margin-bottom: 25px;
            text-align: center;
            font-family: 'Comic Neue', cursive;
            text-shadow: 2px 2px 0 #ffd1dc;
            position: relative;
            display: inline-block;
            padding: 0 15px;
        }
        
        .ranking-card h2:after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80%;
            height: 4px;
            background: linear-gradient(90deg, #ff6b9c, #ffb347);
            border-radius: 2px;
        }
        
        .ranking-item {
            display: flex;
            align-items: center;
            padding: 15px;
            margin-bottom: 15px;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 20px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            position: relative;
        }
        
        .ranking-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(255, 107, 156, 0.2);
            background: #fff;
        }
        
        .rank-number {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #ff6b9c, #ffb347);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: bold;
            margin-right: 15px;
            flex-shrink: 0;
            box-shadow: 0 4px 0 rgba(200, 80, 120, 0.5);
        }
        
        .rank-1 .rank-number {
            background: linear-gradient(135deg, #ffd700, #ffb347);
            box-shadow: 0 4px 0 rgba(180, 150, 0, 0.5);
            animation: pulse 2s infinite;
        }
        
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); }
        }
        
        .rank-2 .rank-number {
            background: linear-gradient(135deg, #c0c0c0, #a0a0a0);
            box-shadow: 0 4px 0 rgba(100, 100, 100, 0.5);
        }
        
        .rank-3 .rank-number {
            background: linear-gradient(135deg, #cd7f32, #a55a28);
            box-shadow: 0 4px 0 rgba(120, 70, 30, 0.5);
        }
        
        /* 修改头像容器样式以显示照片 */
        .avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid #ffd1dc;
            margin-right: 15px;
            background: #ffebf3;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            flex-shrink: 0;
        }
        
        .avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 50%;
            transition: transform 0.3s ease;
        }
        
        .ranking-item:hover .avatar img {
            transform: scale(1.1);
        }
        
        .student-info {
            text-align: left;
            flex-grow: 1;
        }
        
        .student-name {
            font-size: 1.4rem;
            font-weight: bold;
            color: #ff6b9c;
            margin-bottom: 5px;
            font-family: 'Comic Neue', cursive;
        }
        
        .student-class {
            font-size: 1.1rem;
            color: #5a5a5a;
        }
        
        /* 卡通人物装饰 */
        .cartoon-character {
            position: absolute;
            z-index: 10;
            width: 120px;
            height: 120px;
            background: #ffd700;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            border: 5px solid white;
            animation: move 15s infinite linear;
        }
        
        .cartoon-character:before, .cartoon-character:after {
            content: "";
            position: absolute;
            background: white;
            border-radius: 50%;
        }
        
        .cartoon-character:before {
            width: 30px;
            height: 30px;
            top: 25px;
            left: 25px;
        }
        
        .cartoon-character:after {
            width: 30px;
            height: 30px;
            top: 25px;
            right: 25px;
        }
        
        .cartoon-character i {
            font-size: 50px;
            color: #ff6b9c;
            z-index: 2;
        }
        
        .character-1 {
            top: -60px;
            left: 10%;
            animation-delay: 0s;
        }
        
        .character-2 {
            bottom: -60px;
            right: 15%;
            animation-delay: -5s;
            background: #4aa8ff;
        }
        
        .character-3 {
            top: 40%;
            right: -60px;
            animation-delay: -10s;
            background: #ffb347;
        }
        
        @keyframes move {
            0% { transform: translate(0, 0) rotate(0); }
            25% { transform: translate(50px, 30px) rotate(10deg); }
            50% { transform: translate(0, 60px) rotate(0); }
            75% { transform: translate(-50px, 30px) rotate(-10deg); }
            100% { transform: translate(0, 0) rotate(0); }
        }
        
		/* 颜色变换特效 */
.color-change-1,
.color-change-2,
.color-change-3,
.color-change-4,
.color-change-5 {
    font-weight: bold;
    padding: 0 2px;
    background: none !important;
}

.color-change-1 { animation: colorChange1 5s infinite; }
.color-change-2 { animation: colorChange2 5s infinite; }
.color-change-3 { animation: colorChange3 5s infinite; }
.color-change-4 { animation: colorChange4 5s infinite; }
.color-change-5 { animation: colorChange5 5s infinite; }

@keyframes colorChange1 {
    0% { color: #ff0000; }
    25% { color: #ff8000; }
    50% { color: #ffff00; }
    75% { color: #00ff00; }
    100% { color: #ff0000; }
}

@keyframes colorChange2 {
    0% { color: #0000ff; }
    25% { color: #8000ff; }
    50% { color: #ff00ff; }
    75% { color: #00ffff; }
    100% { color: #0000ff; }
}

@keyframes colorChange3 {
    0% { color: #ff0000; }
    50% { color: #ff6600; }
    100% { color: #ff0000; }
}

@keyframes colorChange4 {
    0% { color: #ff8000; }
    50% { color: #ffcc00; }
    100% { color: #ff8000; }
}

@keyframes colorChange5 {
    0% { color: #008000; }
    50% { color: #00cc00; }
    100% { color: #008000; }
}
		
		/* 字体放大效果 */
		.enlarged-text {
    font-size: 24px;
    line-height: 1.5;
  }
  .color-change-1 {
    color: #FF5733;
  }
  .color-change-2 {
    color: #FFD700;
  }
  .silver {
    color: #C0C0C0;
  }
		
        /* 移动菜单样式 - 修复版 */
        .mobile-menu {
            display: none;
            position: absolute;
            top: 90px;
            left: 0;
            width: 100%;
            background: linear-gradient(90deg, #ff6b9c, #ffb347);
            z-index: 1000;
            padding: 20px;
            border-top: 4px dotted white;
            border-bottom: 4px dotted white;
        }
        
        .mobile-menu.active {
            display: block;
        }
        
        .mobile-links {
            list-style: none;
        }
        
        .mobile-links li {
            margin-bottom: 15px;
        }
        
        .mobile-links a {
            color: white;
            text-decoration: none;
            font-size: 20px;
            display: block;
            padding: 12px 15px;
            border-radius: 50px;
            transition: all 0.3s ease;
            font-family: 'Comic Neue', cursive;
            text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.2);
            background: rgba(255, 255, 255, 0.2);
        }
        
        .mobile-links a:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: scale(1.05);
        }
        
        .mobile-dropdown-content {
            background: rgba(255, 255, 255, 0.3);
            border-radius: 20px;
            margin-top: 10px;
            margin-left: 30px;
            display: none;
            padding: 10px;
        }
        
        .mobile-dropdown-content.active {
            display: block;
        }
        
        .mobile-action-buttons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
            justify-content: center;
        }
        
        .mobile-action-buttons .btn {
            padding: 12px 20px;
            font-size: 16px;
        }
        
        /* 响应式设计 - 修复手机端问题 */
        @media (max-width: 992px) {
            .nav-links, .action-buttons {
                display: none;
            }
            
            .hamburger {
                display: block;
            }
            
            .navbar {
                height: 80px;
            }
            
            .mobile-menu {
                top: 80px;
            }
            
            .feature-card {
                width: 100%;
                max-width: 400px;
            }
            
            .ranking-card {
                width: 100%;
                max-width: 400px;
            }
            
            .cartoon-character {
                display: none;
            }
            
            .content h1 {
                font-size: 2.8rem;
                padding: 0 15px;
            }
            
            .content p {
                font-size: 1.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .container {
                border-radius: 20px;
                margin: 10px;
            }
            
            .content {
                padding: 30px 20px;
            }
            
            .content h1 {
                font-size: 2.3rem;
                transform: rotate(0);
            }
            
            .features {
                gap: 20px;
            }
            
            .feature-card {
                padding: 25px;
            }
            
            .feature-card i {
                font-size: 50px;
            }
            
            .feature-card h3 {
                font-size: 1.5rem;
            }
            
            .feature-card p {
                font-size: 1rem;
            }
            
            .logo-text {
                font-size: 26px;
            }
            
            .ranking-card h2 {
                font-size: 1.8rem;
            }
            
            .ranking-item {
                padding: 12px;
            }
            
            .avatar {
                width: 50px;
                height: 50px;
            }
            
            .student-name {
                font-size: 1.2rem;
            }
            
            .student-class {
                font-size: 1rem;
            }
        }
        
        @media (max-width: 480px) {
            .content h1 {
                font-size: 1.8rem;
                margin-bottom: 15px;
            }
            
            .content p {
                font-size: 1rem;
                margin-bottom: 30px;
            }
            
            .logo {
                padding: 5px 10px;
            }
            
            .logo-text {
                font-size: 22px;
            }
            
            .logo-icon {
                font-size: 26px;
            }
            
            .mobile-links a {
                font-size: 18px;
                padding: 10px 12px;
            }
            
            .ranking-card {
                padding: 20px 15px;
            }
            
            .rank-number {
                width: 35px;
                height: 35px;
                font-size: 1.2rem;
            }
        }
        
        /* 修复汉堡菜单图标位置 */
        .hamburger-container {
            display: flex;
            align-items: center;
        }
        
        /* 页面加载动画 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .content > * {
            animation: fadeIn 0.6s ease-out forwards;
        }
        
        .content h1 { animation-delay: 0.1s; }
        .content p { animation-delay: 0.3s; }
        .features { animation-delay: 0.5s; }
        .rankings { animation-delay: 0.7s; }
        
        /* 新增：移动端导航菜单动画 */
        @keyframes slideDown {
            from { transform: translateY(-20px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }
        
        .mobile-menu.active {
            animation: slideDown 0.4s ease-out;
        }
        
        /* 照片加载状态指示器 */
        .avatar-loading {
            background: linear-gradient(90deg, #ffd1dc, #ffb347, #ffd1dc);
            background-size: 200% 200%;
            animation: loadingAnimation 1.5s infinite;
        }
        
        @keyframes loadingAnimation {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }