:root {
            --primary-color: #c62828;
            --secondary-color: #1a237e;
            --accent-color: #ff9800;
            --light-color: #f5f5f5;
            --dark-color: #212121;
            --text-color: #333;
            --shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand i {
            color: var(--accent-color);
        }
        .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem !important;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1549037173-e3b717902c57?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            min-height: 90vh;
            display: flex;
            align-items: center;
            padding-top: 100px;
        }
        .hero-title {
            font-size: 3.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .section-title {
            position: relative;
            display: inline-block;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 70%;
            height: 4px;
            background: var(--primary-color);
            bottom: -10px;
            left: 15%;
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--light-color);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            transition: all 0.3s ease;
        }
        .icon-box i {
            font-size: 2rem;
            color: var(--primary-color);
        }
        .feature-item:hover .icon-box {
            background: var(--primary-color);
            transform: rotateY(180deg);
        }
        .feature-item:hover .icon-box i {
            color: white;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.8rem 2rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #a71c1c;
            border-color: #a71c1c;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(198, 40, 40, 0.3);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .testimonial-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: var(--shadow);
            position: relative;
        }
        .testimonial-card:before {
            content: "\f10d";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            top: 20px;
            left: 20px;
            font-size: 2rem;
            color: rgba(198, 40, 40, 0.2);
        }
        .testimonial-img {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            object-fit: cover;
            border: 4px solid var(--light-color);
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding-bottom: 1.5rem;
            margin-bottom: 1.5rem;
            transition: all 0.3s ease;
        }
        .news-item:hover {
            border-bottom-color: var(--primary-color);
            padding-left: 10px;
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            width: 70px;
            height: 70px;
            border-radius: 10px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        .friendlink {
            background: var(--light-color);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        footer {
            background: var(--dark-color);
            color: white;
            padding-top: 3rem;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .footer-bottom {
            background: #111;
            padding: 1.5rem 0;
            margin-top: 3rem;
            font-size: 0.9rem;
        }
        .contact-info li {
            margin-bottom: 1rem;
            padding-left: 2rem;
            position: relative;
        }
        .contact-info i {
            position: absolute;
            left: 0;
            top: 5px;
            color: var(--accent-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            color: white;
        }
        .course-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--accent-color);
            color: white;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }