body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
            background: #F9FAFB;
            color: #1F2937;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        nav {
            background: #FFFFFF;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 50;
        }
        .nav-scrolled {
            background-color: white;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            transition: background-color 0.3s ease;
        }
        .nav-menu a {
            font-size: 0.875rem;
            font-weight: 500;
            color: #4B5563;
            transition: color 0.2s ease;
        }
        .nav-menu a:hover {
            color: #F9A826; /* 主色调 */
        }
        .btn-primary {
            background: #F9A826;
            color: #FFFFFF;
            padding: 0.5rem 1.25rem;
            border-radius: 0.375rem;
            font-size: 0.875rem;
            font-weight: 500;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(249, 168, 38, 0.4);
        }
        .btn-primary:hover {
            background: #F57F17;
            transform: translateY(-1px);
            box-shadow: 0 6px 12px -2px rgba(245, 127, 23, 0.4);
        }
        .btn-secondary {
            background: #F3F4F6;
            color: #4B5563;
            padding: 0.5rem 1.25rem;
            border-radius: 0.375rem;
            font-size: 0.875rem;
            font-weight: 500;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-secondary:hover {
            background: #E5E7EB;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #F9A826 0%, #F57F17 100%);
            color: #FFFFFF;
            padding: 0.5rem 1.25rem;
            border-radius: 0.375rem;
            font-size: 0.875rem;
            font-weight: 500;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(249, 168, 38, 0.4);
        }
        .btn-gradient:hover {
            background: linear-gradient(135deg, #F57F17 0%, #F9A826 100%);
            transform: translateY(-1px);
            box-shadow: 0 6px 12px -2px rgba(245, 127, 23, 0.4);
        }
        .popup {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }
        .popup.show {
            display: flex;
        }
        .popup-content {
            background: #FFFFFF;
            border-radius: 0.75rem;
            max-width: 600px;
            width: 90%;
            padding: 1.5rem;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
            animation: fadeIn 0.3s ease-out;
        }
        .close-btn {
            position: absolute;
            top: 1rem;
            right: 1rem;
            cursor: pointer;
            color: #6B7280;
            transition: color 0.2s ease;
        }
        .close-btn:hover {
            color: #333333;
        }
        .stepdiscount-card {
            background: #FFFFFF;
            border-radius: 0.75rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            padding: 2rem;
            border: 1px solid #F9A826;
            transition: all 0.3s ease;
        }
        .stepdiscount-card:hover {
            box-shadow: 0 10px 25px -5px rgba(249, 168, 38, 0.1), 0 10px 10px -5px rgba(249, 168, 38, 0.04);
        }
        .config-grid {
            display: grid;
            grid-template-columns: 3fr 2fr;
            gap: 2rem;
        }
        .config-options {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .config-item h3 {
            font-size: 1.125rem;
            font-weight: 600;
            color: #333333;
            margin-bottom: 0.75rem;
        }
        .card-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 1rem;
        }
        .card-box {
            border: 1px solid #E5E7EB;
            border-radius: 0.5rem;
            padding: 1rem;
            background: #FFFFFF;
            cursor: pointer;
            text-align: center;
            transition: all 0.2s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
        }
        .card-box:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(249, 168, 38, 0.1);
            border-color: #F9A826;
        }
        .card-box.card-checked {
            border-color: #F9A826;
            background: #FFF8E1;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(249, 168, 38, 0.1);
        }
        .card-box svg {
            width: 1.5rem;
            height: 1.5rem;
            color: #F9A826;
        }
        .card-box p {
            margin: 0;
            font-size: 0.875rem;
            font-weight: 500;
            color: #333333;
        }
        .card-box p.text-xs {
            font-size: 0.75rem;
            color: #6B7280;
        }
        .benefits-list li {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.875rem;
            color: #4B5563;
        }
        .pricing-card {
            background: #FFF8E1;
            border-radius: 0.5rem;
            padding: 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            border: 1px solid #F9A826;
            transition: all 0.3s ease;
        }
        .pricing-card:hover {
            box-shadow: 0 10px 25px -5px rgba(249, 168, 38, 0.1), 0 10px 10px -5px rgba(249, 168, 38, 0.04);
        }
        .pricing-item {
            display: flex;
            justify-content: space-between;
            font-size: 0.875rem;
            color: #4B5563;
        }
        .pricing-item.total {
            font-weight: 600;
            color: #333333;
        }
        .pricing-item.total span:last-child {
            color: #F57F17;
            font-size: 1.125rem;
        }
        .order-button {
            background: linear-gradient(135deg, #F9A826 0%, #F57F17 100%);
            color: #FFFFFF;
            padding: 0.75rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 500;
            text-align: center;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(249, 168, 38, 0.4);
        }
        .order-button:hover {
            background: linear-gradient(135deg, #F57F17 0%, #F9A826 100%);
            transform: translateY(-1px);
            box-shadow: 0 6px 12px -2px rgba(245, 127, 23, 0.4);
        }
        .promotion-banner {
            background: #FFF8E1;
            padding: 0.75rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            color: #F57F17;
            text-align: center;
            border: 1px solid #F9A826;
        }
        .table-card {
            background: #FFFFFF;
            border-radius: 0.75rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            padding: 2rem;
        }
        .table-responsive {
            overflow-x: auto;
        }
        table {
            width: 100%;
            border-collapse: collapse;
        }
        th, td {
            padding: 0.75rem 1rem;
            text-align: left;
            font-size: 0.875rem;
        }
        th {
            color: #6B7280;
            font-weight: 500;
            min-width: 150px;
        }
        td {
            color: #4B5563;
        }
        .table-row:nth-child(even) {
            background: #F9FAFB;
        }
        .table-row:hover {
            background: #EFF6FF;
        }
        footer {
            background: #333333;
            color: #FFFFFF;
            padding: 3rem 0;
            font-size: 0.875rem;
        }
        footer h3 {
            color: #FFFFFF;
            font-weight: 600;
        }
        footer p {
            color: #E0E0E0;
        }
        footer a {
            color: #F9A826;
            transition: color 0.2s ease;
        }
        footer a:hover {
            color: #F57F17;
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        .pulse {
            animation: pulse 2s infinite;
        }
        .spinner {
            display: none;
            border: 2px solid #E5E7EB;
            border-top: 2px solid #F9A826;
            border-radius: 50%;
            width: 16px;
            height: 16px;
            animation: spin 1s linear infinite;
        }
        .btn-loading .spinner {
            display: inline-block;
        }
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 60;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .nav-overlay.show {
            display: block;
            opacity: 1;
        }
        .nav-slideout {
            position: fixed;
            top: 0;
            right: -100%;
            width: 80%;
            max-width: 300px;
            height: 100%;
            background: #FFFFFF;
            z-index: 70;
            transition: right 0.3s ease-in-out;
            display: flex;
            flex-direction: column;
            padding: 2rem;
            box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
        }
        .nav-slideout.show {
            right: 0;
        }
        .nav-slideout .close-btn {
            align-self: flex-end;
            width: 2rem;
            height: 2rem;
            background: #F3F4F6;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.2s ease;
            z-index: 71;
            cursor: pointer;
        }
        .nav-slideout .close-btn:hover {
            background: #E5E7EB;
        }
        .nav-slideout .menu-header {
            font-size: 1.25rem;
            font-weight: 600;
            color: #1F2937;
            margin-bottom: 2rem;
        }
        .nav-slideout ul {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .nav-slideout li {
            opacity: 0;
            transform: translateY(10px);
            animation: slideIn 0.3s ease forwards;
        }
        .nav-slideout li:nth-child(1) { animation-delay: 0.1s; }
        .nav-slideout li:nth-child(2) { animation-delay: 0.2s; }
        .nav-slideout li:nth-child(3) { animation-delay: 0.3s; }
        .nav-slideout li:nth-child(4) { animation-delay: 0.4s; }
        .nav-slideout li:nth-child(5) { animation-delay: 0.5s; }
        .nav-slideout a {
            font-size: 1.125rem;
            font-weight: 500;
            color: #1F2937;
            padding: 0.5rem 0;
            display: block;
            position: relative;
            transition: color 0.2s ease;
        }
        .nav-slideout a:hover {
            color: #F9A826; /* 主色调 */
        }
        .nav-slideout a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: #F9A826; /* 主色调 */
        }
        .nav-slideout .divider {
            border-top: 1px solid #E5E7EB;
            margin: 1rem 0;
        }
        @keyframes slideIn {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
        @media (max-width: 768px) {
            .config-grid {
                grid-template-columns: 1fr;
            }
            .card-row {
                grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            }
            .stepdiscount-card, .table-card {
                padding: 1.25rem;
            }
            .btn-primary, .btn-secondary, .btn-gradient {
                padding: 0.5rem 1rem;
                font-size: 0.75rem;
            }
            th, td {
                padding: 0.5rem;
                font-size: 0.75rem;
                min-width: 100px;
            }
            .nav-menu, .nav-buttons {
                display: none !important;
            }
            .nav-toggle {
                display: block;
            }
            .hero-section {
                padding: 4rem 0;
            }
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section p {
                font-size: 1rem;
            }
            footer .grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        @media (min-width: 769px) {
            .nav-toggle, .nav-overlay, .nav-slideout {
                display: none;
            }
        }
        @media (max-width: 640px) {
            .config-item h3 {
                font-size: 1rem;
            }
            .card-box {
                padding: 0.75rem;
            }
            .card-box svg {
                width: 1.25rem;
                height: 1.25rem;
            }
            .card-box p {
                font-size: 0.75rem;
            }
            .card-box p.text-xs {
                font-size: 0.65rem;
            }
            .pricing-card {
                padding: 1.5rem;
            }
            .pricing-item {
                font-size: 0.875rem;
            }
            .order-button {
                font-size: 0.75rem;
                padding: 0.5rem;
            }
        }