/* Modernized Color Palette & Typography */
        :root {
            --primary-color: #3f51b5; /* Deep Indigo */
            --secondary-color: #03a9f4; /* Sky Blue */
            --light-primary-color: #e8eaf6;
            --text-color: #333;
            --light-text-color: #6c757d;
            --bg-color: #f4f7f9;
            --card-bg-color: #ffffff;
            --border-color: #e0e0e0;
            --shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            --success-color: #4caf50;
            --danger-color: #f44336;
        }


        body { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; background-color: var(--bg-color); color: var(--text-color); line-height: 1.6; }

        .navbar-default {
            background-color: var(--card-bg-color);
            border: none;
            box-shadow: var(--shadow);
            min-height: 70px;
            margin-bottom: 0;
        }
        .navbar-brand {
            padding: 0 15px;
            height: 70px;
            display: flex;
            align-items: center;
        }
        .navbar-brand .logo {
            height: 45px;
            width: auto;
        }
        .navbar-default .navbar-nav > li > a {
            color: var(--text-color);
            font-weight: 500;
            line-height: 40px;
            padding: 15px;
            margin: 0 5px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .navbar-default .navbar-nav > li > a:hover,
        .navbar-default .navbar-nav > li > a:focus {
            color: var(--primary-color);
            background-color: var(--light-primary-color);
        }
        .navbar-default .navbar-nav > .active > a,
        .navbar-default .navbar-nav > .active > a:hover,
        .navbar-default .navbar-nav > .active > a:focus {
            color: var(--primary-color);
            background-color: var(--light-primary-color);
            font-weight: 600;
        }
        .navbar-default .navbar-toggle {
            border-color: var(--border-color);
            margin-top: 18px;
        }
        .navbar-default .navbar-toggle:hover,
        .navbar-default .navbar-toggle:focus {
            background-color: #f7f7f7;
        }
        .navbar-default .navbar-toggle .icon-bar {
            background-color: var(--primary-color);
        }

        .content-card {
            background-color: var(--card-bg-color);
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-top: 30px;
            padding: 40px;
        }

        .page-header {
            margin-top: 0;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 20px;
            margin-bottom: 30px;
        }
        .page-header h1 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .page-header p {
            font-size: 16px;
            color: var(--light-text-color);
        }

        .info-card h2, .info-card h3, .info-card h4 {
            font-weight: 600;
            color: var(--primary-color);
            margin-top: 35px;
            margin-bottom: 15px;
        }
        .info-card h2:first-of-type {
            margin-top: 0;
        }
        .info-card h3 {
            color: var(--text-color);
            font-weight: 600;
        }
        .info-card h4 {
            font-size: 18px;
            color: var(--secondary-color);
            font-weight: 600;
        }
        .info-card p {
            margin-bottom: 15px;
        }

        .info-card ul, .info-card ol {
            padding-left: 20px;
            margin-bottom: 20px;
        }
        .info-card li {
            margin-bottom: 10px;
        }

        .site-footer {
            background-color: #2c3e50;
            color: #bdc3c7;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .site-footer h4 {
            color: #ffffff;
            font-weight: 600;
            margin-bottom: 15px;
        }
        .footer-bottom {
            border-top: 1px solid #34495e;
            margin-top: 30px;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            margin: 0 10px;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: #ffffff;
        }

        .content-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 20px 0;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }

        .cta-box {
            background-color: var(--light-primary-color);
            border-left: 5px solid var(--primary-color);
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
        }
        .cta-box a {
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: underline;
            transition: color 0.3s ease;
        }
        .cta-box a:hover {
            color: var(--secondary-color);
        }

        /* 确保 FAQ 部分样式清晰 */
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 20px;
            margin-bottom: 20px;
        }
        .faq-item h4 {
            color: var(--text-color);
            margin-top: 0;
            margin-bottom: 10px;
        }
        .faq-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }