:root {
            --bosch-red: #e3000e;
            --bosch-gray: #333333;
            --bosch-light-gray: #f5f5f5;
            --transition-speed: 0.3s;
        }
        body {
            font-family: "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
        }
        .navbar {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            padding-top: 0.75rem;
            padding-bottom: 0.75rem;
            transition: all var(--transition-speed);
        }
        .navbar-brand img {
            height: 40px;
            transition: height var(--transition-speed);
        }
        .nav-link {
            color: var(--bosch-gray) !important;
            font-weight: 500;
            margin: 0 8px;
            position: relative;
            transition: color var(--transition-speed);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--bosch-red) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--bosch-red);
            left: 50%;
            bottom: -5px;
            transition: all var(--transition-speed);
            transform: translateX(-50%);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0;
            margin-top: 76px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 6rem 0;
                margin-top: 70px;
            }
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
            color: var(--bosch-gray);
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 60px;
            height: 3px;
            background: var(--bosch-red);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1) !important;
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform var(--transition-speed);
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-bosch {
            background-color: var(--bosch-red);
            color: white;
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 500;
            border: 2px solid var(--bosch-red);
            transition: all var(--transition-speed);
        }
        .btn-bosch:hover {
            background-color: transparent;
            color: var(--bosch-red);
        }
        .btn-bosch-outline {
            background-color: transparent;
            color: var(--bosch-red);
            border: 2px solid var(--bosch-red);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 500;
            transition: all var(--transition-speed);
        }
        .btn-bosch-outline:hover {
            background-color: var(--bosch-red);
            color: white;
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: rgba(227, 0, 14, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            transition: all var(--transition-speed);
        }
        .icon-box i {
            font-size: 36px;
            color: var(--bosch-red);
            transition: all var(--transition-speed);
        }
        .feature-item:hover .icon-box {
            background: var(--bosch-red);
            transform: rotateY(180deg);
        }
        .feature-item:hover .icon-box i {
            color: white;
            transform: rotateY(-180deg);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: #e0e0e0;
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            position: relative;
        }
        .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            top: 30px;
            border-radius: 50%;
            z-index: 1;
            box-shadow: 0 0 0 4px #e0e0e0;
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            left: -10px;
            right: auto;
        }
        .timeline-item:nth-child(odd) .timeline-content::before {
            content: '';
            position: absolute;
            width: 0;
            height: 0;
            border-top: 10px solid transparent;
            border-bottom: 10px solid transparent;
            border-left: 10px solid white;
            right: -10px;
            top: 30px;
        }
        .timeline-item:nth-child(even) .timeline-content::before {
            content: '';
            position: absolute;
            width: 0;
            height: 0;
            border-top: 10px solid transparent;
            border-bottom: 10px solid transparent;
            border-right: 10px solid white;
            left: -10px;
            top: 30px;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
                left: 0 !important;
            }
            .timeline-item:nth-child(even) .timeline-content::after,
            .timeline-item:nth-child(odd) .timeline-content::after {
                left: 21px;
                right: auto;
            }
            .timeline-item:nth-child(even) .timeline-content::before,
            .timeline-item:nth-child(odd) .timeline-content::before {
                border-right: 10px solid white;
                border-left: none;
                left: -10px;
                right: auto;
            }
        }
        .news-card {
            border-left: 4px solid var(--bosch-red);
            transition: all var(--transition-speed);
        }
        .news-card:hover {
            border-left-color: var(--bosch-gray);
            background-color: var(--bosch-light-gray);
        }
        .footer {
            background-color: var(--bosch-gray);
            color: #ccc;
            padding-top: 3rem;
        }
        .footer a {
            color: #ccc;
            text-decoration: none;
            transition: color var(--transition-speed);
        }
        .footer a:hover {
            color: white;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 2px;
            background: var(--bosch-red);
            bottom: 0;
            left: 0;
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
        }
        .social-icons a:hover {
            background: var(--bosch-red);
            transform: translateY(-5px);
        }
        .copyright {
            background-color: #222;
            padding: 1.5rem 0;
            margin-top: 3rem;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: var(--bosch-light-gray);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 10px 20px;
            margin: 5px 10px;
            border-radius: 30px;
            color: var(--bosch-gray);
            text-decoration: none;
            transition: all var(--transition-speed);
            border: 1px solid #ddd;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--bosch-red);
            color: white;
            border-color: var(--bosch-red);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--bosch-red);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition-speed);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #c4000c;
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--bosch-red);
            margin-bottom: 0.5rem;
        }
        .stats-label {
            font-size: 1.1rem;
            color: var(--bosch-gray);
            font-weight: 500;
        }
        .contact-info-box {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            height: 100%;
            transition: all var(--transition-speed);
        }
        .contact-info-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.1);
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: rgba(227, 0, 14, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .contact-icon i {
            font-size: 24px;
            color: var(--bosch-red);
        }