:root {
            --primary-color: #1a5fb4;
            --secondary-color: #e95420;
            --accent-color: #2ec27e;
            --dark-color: #0d1b2a;
            --light-color: #f8f9fa;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f8f9fa;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(13, 27, 42, 0.85), rgba(13, 27, 42, 0.9)), url('https://images.unsplash.com/photo-1556056504-5c7696c4c28d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 2.5rem;
        }
        .feature-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            background: white;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .stat-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            height: 100%;
        }
        .stat-card:hover {
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .data-table {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .table thead th {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 1.2rem;
        }
        .table tbody tr {
            transition: background-color 0.2s ease;
        }
        .table tbody tr:hover {
            background-color: rgba(26, 95, 180, 0.05);
        }
        .team-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.3s ease;
            background: white;
            height: 100%;
        }
        .team-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .team-img {
            height: 280px;
            object-fit: cover;
        }
        .contact-form {
            background: white;
            border-radius: 15px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        .form-control, .form-select {
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 95, 180, 0.25);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.8rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #144a8c;
            border-color: #144a8c;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 0.8rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #c34113;
            border-color: #c34113;
            transform: translateY(-2px);
        }
        .footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.85);
            padding-top: 3rem;
        }
        .footer a {
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            background-color: rgba(0, 0, 0, 0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .friendlink {
            background-color: #f1f5f9;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            margin: 0.5rem;
            color: #333;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 95, 180, 0.2);
            border-color: var(--primary-color);
        }
        .accordion-button {
            font-weight: 600;
            padding: 1.2rem 1.5rem;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(26, 95, 180, 0.1);
            color: var(--primary-color);
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.25rem rgba(26, 95, 180, 0.25);
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            padding-bottom: 2.5rem;
            padding-left: 2rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.5rem;
            top: 0;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--secondary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 576px) {
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .hero-title {
                font-size: 2rem;
            }
            .contact-form {
                padding: 1.5rem;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #144a8c;
            color: white;
            transform: translateY(-5px);
        }