* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        .section-title {
            text-align: center;
            font-size: 2rem;
            color: #1890ff;
            margin: 2.5rem 0 1.5rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #1890ff, #52c41a);
            border-radius: 2px;
        }
        .btn-primary {
            display: inline-block;
            background: linear-gradient(135deg, #1890ff, #36cfc9);
            color: white;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1.1rem;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(24, 144, 255, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 18px rgba(24, 144, 255, 0.4);
        }
        .card {
            background: white;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        /* Header */
        header {
            background: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: #1890ff;
        }
        .logo span {
            color: #52c41a;
        }
        nav ul {
            display: flex;
            list-style: none;
        }
        nav ul li {
            margin-left: 2rem;
        }
        nav ul li a {
            font-weight: 500;
            padding: 5px 0;
            position: relative;
        }
        nav ul li a:hover {
            color: #1890ff;
        }
        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #1890ff;
            transition: width 0.3s ease;
        }
        nav ul li a:hover::after {
            width: 100%;
        }
        .mobile-menu-btn {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            margin-left: 60%;
        }
        /* Banner */
        .banner {
            background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ff 100%);
            padding: 60px 0;
            text-align: center;
            border-radius: 0 0 20px 20px;
            margin-bottom: 40px;
        }
        .banner h1 {
            font-size: 2.8rem;
            color: #1f1f1f;
            margin-bottom: 15px;
        }
        .banner h1 span {
            color: #1890ff;
        }
        .banner p {
            font-size: 1.2rem;
            color: #666;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        .banner .btn-primary {
            font-size: 1.2rem;
            padding: 15px 40px;
        }
        /* Hot Plans */
        .plans-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 20px;
        }
        .plan-img {
            width: 100%;
            /*height: 180px;*/
            object-fit: cover;
            border-radius: 10px;
            margin-bottom: 15px;
        }
        .plan-title {
            font-size: 1.4rem;
            color: #1f1f1f;
            margin-bottom: 10px;
        }
        .plan-features {
            list-style: none;
            margin-bottom: 20px;
        }
        .plan-features li {
            padding: 5px 0;
            border-bottom: 1px dashed #eee;
        }
        .plan-features li i {
            color: #52c41a;
            margin-right: 8px;
        }
        .plan-price {
            font-size: 1.8rem;
            color: #ff4d4f;
            font-weight: 700;
            margin: 15px 0;
        }
        .plan-price span {
            font-size: 1rem;
            color: #999;
            font-weight: normal;
        }
        /* Process */
        .process-steps {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-top: 30px;
        }
        .step {
            flex: 1;
            min-width: 150px;
            text-align: center;
            padding: 0 10px;
            margin-bottom: 20px;
        }
        .step-icon {
            width: 70px;
            height: 70px;
            background: #e6f7ff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-size: 1.8rem;
            color: #1890ff;
        }
        .step-num {
            display: inline-block;
            width: 30px;
            height: 30px;
            background: #1890ff;
            color: white;
            border-radius: 50%;
            line-height: 30px;
            margin-bottom: 10px;
        }
        /* Coverage */
        .coverage-map {
            text-align: center;
            margin-top: 20px;
        }
        .coverage-img {
            max-width: 100%;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        /* Tutorial & Tips */
        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            margin-top: 20px;
        }
        .info-item h3 {
            color: #1890ff;
            margin-bottom: 10px;
            padding-bottom: 8px;
            border-bottom: 2px solid #f0f0f0;
        }
        .info-item ul {
            padding-left: 20px;
        }
        .info-item li {
            margin-bottom: 8px;
        }
        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 30px auto 0;
        }
        .faq-item {
            margin-bottom: 15px;
        }
        .faq-q {
            background: white;
            padding: 18px 20px;
            border-radius: 10px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .faq-q i {
            transition: transform 0.3s ease;
        }
        .faq-a {
            padding: 20px;
            background: #f9f9f9;
            border-radius: 0 0 10px 10px;
            margin-top: 2px;
            display: none;
        }
        /* Footer Nav (M端) */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: white;
            box-shadow: 0 -2px 15px rgba(0, 0, 0, 0.1);
            z-index: 1001;
        }
        .nav-items {
            display: flex;
        }
        .nav-item {
            flex: 1;
            text-align: center;
            padding: 15px 10px;
            color: #666;
            font-size: 0.9rem;
        }
        .nav-item i {
            display: block;
            font-size: 1.3rem;
            margin-bottom: 5px;
            color: #1890ff;
        }
        .nav-item.active {
            color: #1890ff;
            font-weight: 600;
        }
        /* Footer */
        footer {
            background: #1f1f1f;
            color: #aaa;
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .footer-col {
            flex: 1;
            min-width: 200px;
            margin-bottom: 20px;
        }
        .footer-col h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col a {
            transition: color 0.3s ease;
        }
        .footer-col a:hover {
            color: #1890ff;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            margin-top: 20px;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #777;
        }
        /* Responsive */
        @media (max-width: 992px) {
            .banner h1 {
                font-size: 2.2rem;
            }
            .process-steps {
                justify-content: center;
            }
            .step {
                min-width: 45%;
            }
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            nav ul {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: white;
                flex-direction: column;
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
                padding: 20px 0;
            }
            nav ul.show {
                display: flex;
            }
            nav ul li {
                margin: 0;
                text-align: center;
                padding: 12px 0;
            }
            .banner {
                padding: 40px 0;
            }
            .banner h1 {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .plans-grid {
                grid-template-columns: 1fr;
            }
            .step {
                min-width: 100%;
            }
            .mobile-bottom-nav {
                display: block;
            }
            body {
                padding-bottom: 70px;
            }
        }