/* ====== 独享CSS部分（美国公司注册页面） ====== */
        /* 页面顶部横幅 */
        .page-header {
            min-height: 70vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: 120px;
            background: linear-gradient(135deg, #0f1a36 0%, #1c2b5c 70%, #003566 100%);
            margin-bottom: 80px;
        }
        
        .page-header:before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background: url("data:image/svg+xml,%3Csvg width='100' height='20' viewBox='0 0 100 20' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M21.184 20c.357-.13.72-.264 1.088-.402l1.768-.661C33.64 15.347 39.647 14 50 14c10.271 0 15.362 1.222 24.629 4.928.955.383 1.869.74 2.75 1.072h6.225c-2.51-.73-5.139-1.691-8.233-2.928C65.888 13.278 60.562 12 50 12c-10.626 0-16.855 1.397-26.66 5.063l-1.767.662c-2.475.923-4.66 1.674-6.724 2.275h6.335zm0-20C13.258 2.892 8.077 4 0 4V2c5.744 0 9.951-.574 14.85-2h6.334zM77.38 0C85.239 2.966 90.502 4 100 4V2c-6.842 0-11.386-.542-16.396-2h-6.225zM0 14c8.44 0 13.718-1.21 22.272-4.402l1.768-.661C33.64 5.347 39.647 4 50 4c10.271 0 15.362 1.222 24.629 4.928C84.112 12.722 89.438 14 100 14v-2c-10.271 0-15.362-1.222-24.629-4.928C65.888 3.278 60.562 2 50 2 39.374 2 33.145 3.397 23.34 7.063l-1.767.662C13.223 10.84 8.163 12 0 12v2z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
            opacity: 0.3;
        }
        
        .page-header:after {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
            top: -200px;
            right: -200px;
            border-radius: 50%;
            animation: pulseGlow 8s ease-in-out infinite alternate;
        }
        
        @keyframes pulseGlow {
            0% { opacity: 0.3; transform: scale(1); }
            100% { opacity: 0.5; transform: scale(1.1); }
        }
        
        .page-header-content {
            position: relative;
            z-index: 2;
            color: white;
            max-width: 900px;
        }
        
        .page-header-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            color: white;
            padding: 10px 25px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 25px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            animation: badgePulse 3s infinite alternate;
        }
        
        @keyframes badgePulse {
            0% { box-shadow: 0 0 10px rgba(255, 255, 255, 0.2); }
            100% { box-shadow: 0 0 20px rgba(255, 255, 255, 0.4); }
        }
        
        .page-header-title {
            font-size: 4rem;
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 25px;
            text-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        
        .page-header-desc {
            font-size: 1.3rem;
            opacity: 0.9;
            margin-bottom: 40px;
            max-width: 800px;
        }
        
        .header-cta-group {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .btn-primary {
            background: var(--gradient-accent);
            color: white;
            padding: 16px 36px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: var(--transition);
            box-shadow: 0 10px 30px rgba(0, 180, 216, 0.2);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        
        .btn-primary:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 180, 216, 0.3);
        }
        
        .btn-secondary {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            color: white;
            padding: 16px 36px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.2);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-5px);
        }
        
        /* 服务概览卡片 */
        .service-overview {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 80px;
        }
        
        .overview-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 40px 30px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        
        .overview-card:before {
            content: '';
            position: absolute;
            width: 100%;
            height: 5px;
            top: 0;
            left: 0;
            background: var(--gradient-accent);
            transition: var(--transition);
        }
        
        .overview-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }
        
        .overview-card:hover:before {
            height: 10px;
        }
        
        .overview-icon {
            width: 70px;
            height: 70px;
            background: rgba(0, 180, 216, 0.1);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: var(--accent);
            font-size: 2rem;
        }
        
        .overview-title {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .overview-text {
            color: #666;
            font-size: 1rem;
        }
        
        /* 详细内容部分 */
        .detail-section {
            margin-bottom: 100px;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--accent);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .section-title p {
            color: #666;
            max-width: 700px;
            margin: 25px auto 0;
            font-size: 1.1rem;
        }
        
        /* 税率介绍 */
        .tax-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .tax-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 35px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .tax-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .tax-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 25px;
        }
        
        .tax-icon {
            width: 60px;
            height: 60px;
            background: rgba(0, 180, 216, 0.1);
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.8rem;
            flex-shrink: 0;
        }
        
        .tax-title {
            font-size: 1.6rem;
            color: var(--primary);
        }
        
        .tax-rate {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 15px;
            text-align: center;
            padding: 15px;
            background: rgba(0, 180, 216, 0.05);
            border-radius: 12px;
        }
        
        .tax-desc {
            color: #666;
            margin-bottom: 20px;
        }
        
        .tax-list {
            list-style: none;
            margin-top: 20px;
        }
        
        .tax-list li {
            margin-bottom: 10px;
            padding-left: 25px;
            position: relative;
        }
        
        .tax-list li:before {
            content: '•';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-size: 1.5rem;
        }
        
        /* 各州政策对比表 */
        .states-table-container {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            margin-bottom: 60px;
            overflow-x: auto;
        }
        
        .states-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }
        
        .states-table thead {
            background: var(--gradient-primary);
            color: white;
        }
        
        .states-table th {
            padding: 25px 20px;
            text-align: left;
            font-weight: 600;
            font-size: 1.1rem;
        }
        
        .states-table tbody tr {
            border-bottom: 1px solid rgba(15, 26, 54, 0.05);
            transition: var(--transition);
        }
        
        .states-table tbody tr:hover {
            background: rgba(0, 180, 216, 0.03);
        }
        
        .states-table tbody tr:last-child {
            border-bottom: none;
        }
        
        .states-table td {
            padding: 20px;
        }
        
        .state-name {
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .state-icon {
            width: 30px;
            height: 30px;
            background: rgba(0, 180, 216, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 0.9rem;
        }
        
        .recommended-badge {
            display: inline-block;
            background: linear-gradient(90deg, #00b4d8, #0077b6);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 10px;
        }
        
        /* 优劣势分析 */
        .comparison-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }
        
        .comparison-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .comparison-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }
        
        .comparison-header {
            padding: 30px;
            color: white;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .advantages .comparison-header {
            background: linear-gradient(90deg, #4CAF50, #8BC34A);
        }
        
        .disadvantages .comparison-header {
            background: linear-gradient(90deg, #FF9800, #FF5722);
        }
        
        .comparison-icon {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            flex-shrink: 0;
        }
        
        .comparison-title {
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .comparison-list {
            padding: 30px;
            list-style: none;
        }
        
        .comparison-list li {
            margin-bottom: 20px;
            padding-left: 35px;
            position: relative;
        }
        
        .comparison-list li:before {
            position: absolute;
            left: 0;
            top: 0;
            font-weight: 900;
            font-size: 1.2rem;
        }
        
        .advantages .comparison-list li:before {
            content: '✓';
            color: #4CAF50;
        }
        
        .disadvantages .comparison-list li:before {
            content: '⚠';
            color: #FF9800;
        }
        
        /* 公司架构介绍 */
        .structure-visual {
            display: flex;
            justify-content: center;
            margin-bottom: 60px;
            position: relative;
        }
        
        .structure-diagram {
            width: 100%;
            max-width: 900px;
            background: white;
            border-radius: var(--border-radius);
            padding: 40px;
            box-shadow: var(--shadow);
            position: relative;
        }
        
        .structure-title {
            text-align: center;
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 40px;
        }
        
        .structure-levels {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        
        .structure-level {
            position: relative;
        }
        
        .level-label {
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 15px;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .level-label:before {
            content: '';
            width: 15px;
            height: 15px;
            background: var(--accent);
            border-radius: 50%;
        }
        
        .level-content {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
        }
        
        .level-item {
            background: rgba(0, 180, 216, 0.05);
            border: 1px solid rgba(0, 180, 216, 0.1);
            padding: 20px;
            border-radius: 12px;
            flex: 1;
            min-width: 200px;
            transition: var(--transition);
        }
        
        .level-item:hover {
            background: rgba(0, 180, 216, 0.1);
            transform: translateY(-5px);
        }
        
        .item-title {
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .item-title i {
            color: var(--accent);
        }
        
        .item-desc {
            color: #666;
            font-size: 0.95rem;
        }
        
        /* 办理流程 */
        .process-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 50px;
            box-shadow: var(--shadow);
            margin-bottom: 80px;
            position: relative;
            overflow: hidden;
        }
        
        .process-container:before {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(0, 180, 216, 0.05) 0%, transparent 70%);
            top: -100px;
            right: -100px;
        }
        
        .process-timeline {
            position: relative;
            max-width: 800px;
            margin: 50px auto 0;
        }
        
        .process-timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--gradient-accent);
            border-radius: 2px;
        }
        
        .process-step {
            position: relative;
            margin-bottom: 50px;
            padding-left: 40px;
        }
        
        .process-step:last-child {
            margin-bottom: 0;
        }
        
        .process-step:before {
            content: '';
            position: absolute;
            left: -8px;
            top: 5px;
            width: 20px;
            height: 20px;
            background: white;
            border: 4px solid var(--accent);
            border-radius: 50%;
            z-index: 2;
        }
        
        .step-number {
            position: absolute;
            left: -40px;
            top: 0;
            width: 40px;
            height: 40px;
            background: var(--gradient-accent);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
            z-index: 3;
        }
        
        .step-title {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 10px;
        }
        
        .step-desc {
            color: #666;
        }
        
        .step-duration {
            display: inline-block;
            background: rgba(0, 180, 216, 0.1);
            color: var(--accent);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-top: 10px;
        }
        
        /* CTA部分 */
        .cta-section {
            background: var(--gradient-primary);
            border-radius: var(--border-radius);
            padding: 80px 50px;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
            margin-bottom: 80px;
        }
        
        .cta-section:before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background: url("data:image/svg+xml,%3Csvg width='100' height='20' viewBox='0 0 100 20' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M21.184 20c.357-.13.72-.264 1.088-.402l1.768-.661C33.64 15.347 39.647 14 50 14c10.271 0 15.362 1.222 24.629 4.928.955.383 1.869.74 2.75 1.072h6.225c-2.51-.73-5.139-1.691-8.233-2.928C65.888 13.278 60.562 12 50 12c-10.626 0-16.855 1.397-26.66 5.063l-1.767.662c-2.475.923-4.66 1.674-6.724 2.275h6.335zm0-20C13.258 2.892 8.077 4 0 4V2c5.744 0 9.951-.574 14.85-2h6.334zM77.38 0C85.239 2.966 90.502 4 100 4V2c-6.842 0-11.386-.542-16.396-2h-6.225zM0 14c8.44 0 13.718-1.21 22.272-4.402l1.768-.661C33.64 5.347 39.647 4 50 4c10.271 0 15.362 1.222 24.629 4.928C84.112 12.722 89.438 14 100 14v-2c-10.271 0-15.362-1.222-24.629-4.928C65.888 3.278 60.562 2 50 2 39.374 2 33.145 3.397 23.34 7.063l-1.767.662C13.223 10.84 8.163 12 0 12v2z' fill='%2300b4d8' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
            opacity: 0.3;
        }
        
        .cta-content {
            position: relative;
            z-index: 2;
        }
        
        .cta-title {
            font-size: 2.8rem;
            margin-bottom: 20px;
        }
        
        .cta-subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 40px;
        }
        
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .cta-buttons .btn-primary {
            background: white;
            color: var(--primary);
        }
        
        .cta-buttons .btn-primary:hover {
            background: var(--accent-light);
            color: white;
        }
        
        .cta-buttons .btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        
        .cta-buttons .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .page-header-title {
                font-size: 3rem;
            }
            
            .section-title h2 {
                font-size: 2.3rem;
            }
            
            .structure-diagram {
                padding: 30px;
            }
            
            .process-container {
                padding: 30px;
            }
            
            .cta-section {
                padding: 60px 30px;
            }
            
            .cta-title {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .page-header-title {
                font-size: 2.5rem;
            }
            
            .page-header-desc {
                font-size: 1.1rem;
            }
            
            .header-cta-group {
                flex-direction: column;
            }
            
            .btn-primary, .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .states-table-container {
                margin-left: -24px;
                margin-right: -24px;
                border-radius: 0;
            }
            
            .comparison-grid {
                grid-template-columns: 1fr;
            }
            
            .level-item {
                min-width: 100%;
            }
        }
        
        @media (max-width: 480px) {
            .page-header-title {
                font-size: 2rem;
            }
            
            .section-title h2 {
                font-size: 1.8rem;
            }
            
            .tax-card {
                padding: 25px;
            }
            
            .process-step {
                padding-left: 30px;
            }
            
            .step-number {
                left: -30px;
                width: 30px;
                height: 30px;
                font-size: 1rem;
            }
        }