/* 全局样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        /* 强化科技感变量 - 调亮主色调 */
        :root {
            --primary: #0a1428; /* 调亮主背景色 */
            --secondary: #00f0ff;
            --accent: #7b42f6;
            --light: #e1f0ff; /* 调亮浅色文本 */
            --dark: #08101f; /* 调亮深色背景 */
            --gradient-primary: linear-gradient(135deg, #0a1428 0%, #162440 100%); /* 调亮渐变 */
            --gradient-secondary: linear-gradient(135deg, #142440 0%, #20365f 100%); /* 调亮渐变 */
            --gradient-glow: linear-gradient(90deg, #00f0ff, #7b42f6);
            --shadow: 0 10px 40px rgba(0, 240, 255, 0.25);
            --shadow-strong: 0 0 30px rgba(123, 66, 246, 0.3);
            --border-glow: 0 0 15px rgba(0, 240, 255, 0.5);
        }

        body {
            background-color: var(--primary);
            color: #fff;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 20% 30%, rgba(123, 66, 246, 0.2) 0%, transparent 40%), /* 提高透明度 */
                radial-gradient(circle at 80% 70%, rgba(0, 240, 255, 0.15) 0%, transparent 40%); /* 提高透明度 */
            background-attachment: fixed;
        }

        /* 强化粒子背景容器 */
        #particles-js {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: -1;
            background: var(--gradient-primary);
        }

        /* 科技感网格背景 - 提高可见度 */
        .grid-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -2;
            background-image: 
                linear-gradient(rgba(0, 240, 255, 0.15) 1px, transparent 1px), /* 提高透明度 */
                linear-gradient(90deg, rgba(0, 240, 255, 0.15) 1px, transparent 1px); /* 提高透明度 */
            background-size: 50px 50px;
            opacity: 0.4; /* 提高透明度 */
        }

        /* 导航栏样式 - 增强科技感 */
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 5%;
            background: rgba(10, 20, 40, 0.85); /* 降低透明度，调亮背景 */
            backdrop-filter: blur(15px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            display: flex;
            align-items: center;
            gap: 0.8rem;
            letter-spacing: 0.5px;
        }

        .logo i {
            font-size: 2rem;
            color: var(--secondary);
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.6));
        }

        .nav-links {
            display: flex;
            gap: 2.5rem;
        }

        .nav-links a {
            color: #f0f0f0; /* 调亮导航文字 */
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
            font-weight: 500;
            padding: 0.5rem 0;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background: var(--gradient-glow);
            transition: width 0.3s ease;
        }

        .nav-links a:hover {
            color: var(--secondary);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .btn {
            background: var(--gradient-glow);
            color: #050b18;
            padding: 0.7rem 2rem;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 700;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            box-shadow: 0 5px 15px rgba(123, 66, 246, 0.3);
            letter-spacing: 0.5px;
        }

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-strong);
            filter: brightness(1.1);
        }

        /* 英雄区样式 - 强化科技感 */
        .hero {
            height: 95vh;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 5%;
            position: relative;
            overflow: hidden;
        }

        /* 科技感装饰元素 - 调亮光晕 */
        .hero::before {
            content: '';
            position: absolute;
            width: 800px;
            height: 800px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.2) 0%, rgba(123, 66, 246, 0.15) 100%); /* 调亮 */
            filter: blur(100px);
            right: -200px;
            top: 50%;
            transform: translateY(-50%);
            z-index: -1;
        }

        .hero::after {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(123, 66, 246, 0.2) 0%, rgba(0, 240, 255, 0.15) 100%); /* 调亮 */
            filter: blur(80px);
            left: -150px;
            bottom: -100px;
            z-index: -1;
        }

        .hero-content {
            flex: 1;
            z-index: 10;
            padding-right: 2rem;
        }

        .hero-content h1 {
            font-size: 4.5rem;
            line-height: 1.1;
            margin-bottom: 2rem;
            font-weight: 800;
        }

        .hero-content h1 span {
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 0 20px rgba(0, 240, 255, 0.4); /* 增强发光效果 */
        }

        .hero-content p {
            font-size: 1.3rem;
            color: var(--light);
            margin-bottom: 2.5rem;
            max-width: 650px;
            line-height: 1.7;
            opacity: 0.95; /* 提高透明度 */
        }

        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
            position: relative;
        }

        .hero-image::before {
            content: '';
            position: absolute;
            width: 90%;
            height: 90%;
            border: 1px solid rgba(0, 240, 255, 0.4); /* 提高边框透明度 */
            border-radius: 15px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            box-shadow: var(--border-glow);
            z-index: -1;
        }

        .hero-image img {
            width: 90%;
            border-radius: 15px;
            box-shadow: var(--shadow-strong);
            animation: float 8s ease-in-out infinite;
            border: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
            filter: brightness(1.1); /* 调亮图片 */
        }

        @keyframes float {
            0% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-25px) rotate(1deg); }
            100% { transform: translateY(0px) rotate(0deg); }
        }

        .hero-buttons {
            display: flex;
            gap: 1.5rem;
        }

        .btn-outline {
            background: transparent;
            color: var(--secondary);
            border: 1px solid var(--secondary);
            box-shadow: none;
        }

        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: var(--border-glow);
        }

        /* 通用板块标题样式 */
        .section-title {
            text-align: center;
            margin-bottom: 4rem;
            position: relative;
        }

        .section-title h2 {
            font-size: 3rem;
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            width: 60%;
            height: 4px;
            background: var(--gradient-glow);
            bottom: -15px;
            left: 20%;
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

        .section-title p {
            color: var(--light);
            max-width: 750px;
            margin: 0 auto;
            font-size: 1.1rem;
            line-height: 1.7;
            opacity: 0.9; /* 提高透明度 */
        }

        /* 课程板块样式 - 增强科技感 */
        .courses {
            padding: 8rem 5%;
             /*  background: var(--gradient-secondary);*/
            position: relative;
        }

        .courses::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--gradient-glow);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
        }

        .courses-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2.5rem;
            margin-top: 2rem;
        }

        .course-card {
            background: rgba(12, 24, 48, 0.8); /* 调亮背景，降低透明度 */
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.4s ease;
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            position: relative;
            backdrop-filter: blur(10px);
        }

        .course-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: var(--gradient-glow);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .course-card:hover {
            transform: translateY(-15px);
            box-shadow: var(--shadow-strong);
            border-color: var(--secondary);
        }

        .course-card:hover::before {
            opacity: 1;
        }
        .course-card a{
            text-decoration: none;
        }

        .course-img {
            height: 220px;
            overflow: hidden;
            position: relative;
        }

        .course-img::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, transparent 60%, rgba(10, 20, 40, 0.7)); /* 调亮渐变遮罩 */
            z-index: 1;
        }

        .course-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
            filter: brightness(1.1); /* 调亮课程图片 */
        }

        .course-card:hover .course-img img {
            transform: scale(1.15);
            filter: brightness(1.15); /* 调亮悬停效果 */
        }

        .course-content {
            padding: 2rem;
            position: relative;
            z-index: 2;
        }

        .course-content h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--secondary);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.4); /* 增强发光效果 */
        }

        .course-content p {
                color: var(--light);
                margin-bottom: 1.5rem;
                line-height: 1.7;
                display: -webkit-box;
                -webkit-box-orient: vertical;
                -webkit-line-clamp: 5;
                overflow: hidden;
                opacity: 0.95;        
        }

        .course-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(0, 240, 255, 0.15); /* 提高边框透明度 */
        }

        .course-duration {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: #c0e0ff; /* 调亮文字 */
        }

        .course-price {
            font-weight: 700;
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-size: 1.4rem;
        }

        /* 讲师板块样式 - 增强科技感 */
        .instructors {
            padding: 7rem 5%;
               /* background: var(--gradient-primary);*/
            position: relative;
        }

        .instructors-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 3rem;
        }

        .instructor-card {
            background: rgba(12, 24, 48, 0.8); /* 调亮背景，降低透明度 */
            border-radius: 15px;
            padding: 2.5rem 2rem;
            text-align: center;
            transition: all 0.4s ease;
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
        }

        .instructor-card::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, transparent 70%); /* 调亮 */
            transform: rotate(30deg);
            transition: all 0.5s ease;
            opacity: 0;
        }

        .instructor-card:hover {
            transform: translateY(-15px);
            box-shadow: var(--shadow-strong);
            border-color: var(--secondary);
        }

        .instructor-card:hover::after {
            opacity: 1;
            top: -20%;
            right: -20%;
        }

        .instructor-img {
            width: 140px;
            height: 140px;
            border-radius: 50%;
            overflow: hidden;
            margin: 0 auto 1.5rem;
            border: 3px solid transparent;
            background: var(--gradient-glow) border-box;
            position: relative;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4); /* 增强发光效果 */
        }

        .instructor-img::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 50%;
            background: rgba(10, 20, 40, 0.4); /* 调亮遮罩 */
            z-index: 1;
        }

        .instructor-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: relative;
            z-index: 0;
            filter: brightness(1.1); /* 调亮讲师图片 */
        }

        .instructor-info h3 {
            font-size: 1.5rem;
            margin-bottom: 0.8rem;
            color: var(--secondary);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
        }

        .instructor-title {
            color: var(--secondary);
            margin-bottom: 1.2rem;
            font-weight: 500;
            opacity: 0.95; /* 提高透明度 */
        }

        .instructor-bio {
            color: var(--light);
            line-height: 1.7;
            margin-bottom: 1.5rem;
            opacity: 0.9; /* 提高透明度 */
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 1.2rem;
        }

        .social-links a {
            color: #fff;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.15); /* 调亮背景 */
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            border: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
        }

        .social-links a:hover {
            background: var(--gradient-glow);
            color: var(--primary);
            transform: scale(1.2);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
        }

        /* 学习路径板块 - 新增替代联系模块 */
        .learning-paths {
            padding: 8rem 5%;
            /* background: var(--gradient-secondary); */
            position: relative;
        }

        .paths-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2.5rem;
            margin-top: 2rem;
        }

        .path-card {
            background: rgba(12, 24, 48, 0.8); /* 调亮背景，降低透明度 */
            border-radius: 15px;
            padding: 2.5rem 2rem;
            transition: all 0.4s ease;
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
        }

        .path-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(123, 66, 246, 0.25) 0%, transparent 70%); /* 调亮 */
            border-radius: 0 0 0 100%;
            transition: all 0.5s ease;
        }

        .path-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-strong);
            border-color: var(--secondary);
        }

        .path-card:hover::before {
            width: 150px;
            height: 150px;
        }

        .path-icon {
            font-size: 3rem;
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 1.5rem;
            filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3)); /* 增强发光效果 */
        }

        .path-card h3 {
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            color: var(--secondary);
        }

        .path-card ul {
            list-style: none;
            margin-bottom: 2rem;
        }

        .path-card ul li {
            padding: 0.8rem 0;
            border-bottom: 1px solid rgba(0, 240, 255, 0.15); /* 提高边框透明度 */
            color: var(--light);
            display: flex;
            align-items: center;
            gap: 0.8rem;
            opacity: 0.95; /* 提高透明度 */
        }

        .path-card ul li::before {
            content: '✓';
            color: var(--secondary);
            font-weight: bold;
            font-size: 1.2rem;
        }

        .path-duration {
            display: inline-block;
            padding: 0.5rem 1.2rem;
            background: rgba(0, 240, 255, 0.15); /* 调亮背景 */
            border-radius: 30px;
            color: var(--secondary);
            border: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
            font-weight: 500;
        }

        /* 评价板块样式 - 增强科技感 */
        .testimonials {
            padding: 8rem 5%;
            background: var(--gradient-primary);
            position: relative;
        }

        .testimonials-slider {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
            overflow: hidden;
        }

        .testimonial-wrapper {
            display: flex;
            transition: transform 0.6s ease;
        }

        .testimonial-card {
            min-width: 100%;
            padding: 3rem;
            background: rgba(12, 24, 48, 0.8); /* 调亮背景，降低透明度 */
            border-radius: 15px;
            border-left: 4px solid transparent;
            border-image: var(--gradient-glow) 1;
            margin: 0 1rem;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            box-shadow: 0 10px 30px rgba(10, 20, 40, 0.3); /* 调亮阴影 */
            position: relative;
        }

        .testimonial-card::before {
            content: '"';
            position: absolute;
            top: 20px;
            left: 30px;
            font-size: 5rem;
            color: rgba(0, 240, 255, 0.15); /* 调亮引号 */
            font-family: serif;
        }

        .testimonial-content {
            font-style: italic;
            color: var(--light);
            margin-bottom: 2rem;
            line-height: 1.9;
            font-size: 1.2rem;
            padding-left: 1rem;
            position: relative;
            z-index: 2;
            opacity: 0.95; /* 提高透明度 */
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            position: relative;
            z-index: 2;
        }

        .author-img {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            overflow: hidden;
            border: 2px solid var(--secondary);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4); /* 增强发光效果 */
        }

        .author-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: brightness(1.1); /* 调亮用户头像 */
        }

        .author-info h4 {
            color: var(--secondary);
            font-size: 1.3rem;
            margin-bottom: 0.3rem;
        }

        .author-info p {
            color: var(--light);
            opacity: 0.9; /* 提高透明度 */
        }

        .slider-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(12, 24, 48, 0.9); /* 调亮背景 */
            color: var(--secondary);
            border: 1px solid var(--secondary);
            font-size: 1.5rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            z-index: 10;
            backdrop-filter: blur(10px);
        }

        .slider-btn:hover {
            background: var(--gradient-glow);
            color: var(--primary);
            transform: translateY(-50%) scale(1.1);
            box-shadow: var(--border-glow);
        }

        .prev-btn {
            left: -0.01px;
        }

        .next-btn {
            right: -0.01px;
        }

        /* 新增：课程方向板块样式 */
        .course-categories {
            padding: 8rem 5%;
            /*background: var(--gradient-primary); */
            position: relative;
        }

        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .category-card {
            background: rgba(12, 24, 48, 0.8); /* 调亮背景，降低透明度 */
            border-radius: 15px;
            padding: 3rem 2rem;
            text-align: center;
            transition: all 0.4s ease;
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
        }

        .category-card::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--gradient-glow);
            transform: translateX(-100%);
            transition: transform 0.4s ease;
        }

        .category-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-strong);
            border-color: var(--secondary);
        }

        .category-card:hover::before {
            transform: translateX(0);
        }

        .category-icon {
            font-size: 3.5rem;
            background: var(--gradient-glow);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 1.5rem;
            filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3)); /* 增强发光效果 */
        }

        .category-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--secondary);
        }

        .category-card p {
            color: var(--light);
            line-height: 1.7;
            opacity: 0.9; /* 提高透明度 */
        }

        .category-count {
            display: inline-block;
            margin-top: 1.5rem;
            padding: 0.4rem 1rem;
           /*  background: rgba(123, 66, 246, 0.15); *//* 调亮背景 */
            border-radius: 20px;
            color: var(--accent);
            font-size: 0.9rem;
            font-weight: 600;
        }

        /* 合作院校板块样式 - 修改为参考样式 */
        .partner-universities {
            padding: 8rem 5%;
            /* background: var(--gradient-secondary); */
            position: relative;
            text-align: center;
        }
        .partner-universities .section-title {
            margin-bottom: 3rem;
        }

        .partner-universities .section-title h2 {
            font-size: 3rem;
            background: linear-gradient(90deg, #00f0ff, #7b42f6);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 0.5rem;
        }

        .partner-universities .section-title h2::after {
            display: none;
        }

        .partner-universities .section-title p {
            color: var(--light);
            font-size: 1.1rem;
            opacity: 0.9; /* 提高透明度 */
            margin-bottom: 2rem;
        }

        .universities-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            max-width: 1500px;
            margin: 0 auto;
        }

        .university-card {
            background:rgb(79 223 233 / 33%);
            border-radius: 8px;
            padding: 2rem 1rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            border: 1px solid rgba(0, 240, 255, 0.2); /* 提高边框透明度 */
            backdrop-filter: blur(10px);
            height: 150px;
        }

        .university-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.25); /* 调亮阴影 */
            border-color: rgba(0, 240, 255, 0.4); /* 提高边框透明度 */
        }

        .university-logo {
            font-size: 2.5rem;
            color: #00f0ff;
            margin-bottom: 0.8rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.4)); /* 增强发光效果 */
        }
        .university-logo img {
                    width: 60px;
            }

        .university-name {
            color: #fff;
            font-size: 1rem;
            font-weight: 500;
            text-align: center;
            opacity: 0.95; /* 提高透明度 */
        }

        /* 页脚样式 - 增强科技感 */
        footer {
            background-color: var(--dark);
            padding: 5rem 5% 2rem;
            border-top: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
            position: relative;
        }

        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--gradient-glow);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
        }

        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
            margin-left: 14rem;
        }

        .footer-col h3 {
            color: var(--secondary);
            margin-bottom: 2rem;
            font-size: 1.4rem;
            position: relative;
            padding-bottom: 0.8rem;
        }

        .footer-col h3::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 2px;
            background: var(--secondary);
            bottom: 0;
            left: 0;
        }

        .footer-col p {
            color: var(--light);
            line-height: 1.7;
            opacity: 0.9; /* 提高透明度 */
            margin-bottom: 1.5rem;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 1rem;
        }

        .footer-col ul li a {
            color: var(--light);
            text-decoration: none;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            opacity: 0.9; /* 提高透明度 */
        }

        .footer-col ul li a:hover {
            color: var(--secondary);
            padding-left: 0.5rem;
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
        }

        .footer-social {
            display: flex;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.15); /* 调亮背景 */
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary);
            border: 1px solid rgba(0, 240, 255, 0.3); /* 提高边框透明度 */
            transition: all 0.3s ease;
        }

        .footer-social a:hover {
            background: var(--secondary);
            color: var(--primary);
            transform: scale(1.1);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(0, 240, 255, 0.15); /* 提高边框透明度 */
            color: var(--light);
            font-size: 0.95rem;
            opacity: 0.9; /* 提高透明度 */
        }

        /* 响应式设计 */
        @media (max-width: 1200px) {
            .hero-content h1 {
                font-size: 3.5rem;
            }
            .universities-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 992px) {
            .hero {
                flex-direction: column;
                height: auto;
                padding: 6rem 5% 8rem;
                text-align: center;
            }

            .hero-content {
                margin-bottom: 4rem;
                padding-right: 0;
            }

            .hero-content h1 {
                font-size: 3rem;
            }

            .hero-image img {
                width: 100%;
            }

            .section-title h2 {
                font-size: 2.5rem;
            }
            .universities-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

            .hero-content h1 {
                font-size: 2.5rem;
            }

            .hero-content p {
                font-size: 1.1rem;
            }

            .section-title {
                margin-bottom: 3rem;
            }

            .section-title h2 {
                font-size: 2rem;
            }

            .testimonial-card {
                padding: 2rem 1.5rem;
            }

            .slider-btn {
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }

            .prev-btn {
                left: 0;
            }

            .next-btn {
                right: 0;
            }

            .courses, .instructors, .testimonials, .learning-paths, .course-categories, .partner-universities {
                padding: 5rem 5%;
            }
        }

        @media (max-width: 576px) {
            .courses-grid {
                grid-template-columns: 1fr;
            }

            .hero-buttons {
                flex-direction: column;
                gap: 1rem;
            }

            .btn {
                width: 100%;
                text-align: center;
            }

            .categories-grid {
                grid-template-columns: 1fr;
            }

            .universities-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
            
            .university-card {
                height: 100px;
                padding: 1rem 0.5rem;
            }
            
            .university-logo {
                font-size: 2rem;
            }
            .university-logo img {
                    width: 60px;
            }
            
            
            .university-name {
                font-size: 0.9rem;
            }
        }