:root {
            --primary-color: #1a6b3c;
            --secondary-color: #0d4d2a;
            --accent-color: #ffc107;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--secondary-color);
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1532187863486-abf9dbad1b69?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
        }
        .section-padding {
            padding: 80px 0;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: var(--light-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--primary-color);
            font-size: 2rem;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px;
            background: var(--light-color);
            border-radius: 30px;
            color: var(--dark-color);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .friendlink {
            background-color: #f9f9f9;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
        }
        .footer-link {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-link:hover {
            color: var(--accent-color);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 107, 60, 0.25);
        }
        .sticky-top {
            top: 0;
            z-index: 1020;
        }
        .timeline-item {
            position: relative;
            padding-left: 30px;
            margin-bottom: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: 0;
            top: 5px;
            width: 12px;
            height: 12px;
            background: var(--primary-color);
            border-radius: 50%;
        }
        .timeline-item:after {
            content: '';
            position: absolute;
            left: 5px;
            top: 17px;
            width: 2px;
            height: calc(100% + 13px);
            background: #dee2e6;
        }
        .timeline-item:last-child:after {
            display: none;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .section-padding {
                padding: 50px 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }