:root {
            --primary: #10b981; /* 薄荷春绿 */
            --primary-hover: #059669;
            --primary-light: #e6fcf5;
            --secondary: #06b6d4; /* 科技湖蓝 */
            --dark: #1f2937;
            --dark-light: #374151;
            --light: #f4fbf7; /* 薄荷浅背景 */
            --white: #ffffff;
            --gray: #9ca3af;
            --border: #e5e7eb;
            --max-width: 1200px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", sans-serif;
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header Style */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(10px);
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-wrap img {
            height: 40px;
        }

        nav {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .nav-link {
            color: var(--dark-light);
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s;
        }

        .nav-link:hover {
            color: var(--primary);
        }

        .nav-btn {
            background-color: var(--primary);
            color: var(--white);
            padding: 8px 16px;
            border-radius: 6px;
            font-weight: 600;
            transition: background-color 0.3s, transform 0.2s;
        }

        .nav-btn:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            transition: 0.3s;
        }

        /* Hero Section (No Image) */
        .hero {
            background: linear-gradient(135deg, #e6fcf5 0%, #d1fae5 50%, #ccfbf1 100%);
            padding: 100px 0 80px;
            text-align: center;
            border-bottom: 1px solid rgba(16, 185, 129, 0.1);
        }

        .hero h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 20px;
            font-weight: 800;
            line-height: 1.25;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--dark-light);
            max-width: 800px;
            margin: 0 auto 35px;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .btn-main {
            background-color: var(--primary);
            color: var(--white);
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            box-shadow: 0 4px 6px rgba(16, 185, 129, 0.2);
            transition: all 0.3s;
        }

        .btn-main:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(16, 185, 129, 0.3);
        }

        .btn-sub {
            background-color: var(--white);
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 12px 28px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            transition: all 0.3s;
        }

        .btn-sub:hover {
            background-color: var(--primary-light);
            transform: translateY(-2px);
        }

        /* Data Section */
        .data-section {
            padding: 60px 0;
            background-color: var(--white);
        }

        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .data-card {
            background-color: var(--light);
            border: 1px solid var(--border);
            padding: 30px 20px;
            border-radius: 12px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .data-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            border-color: var(--primary);
        }

        .data-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .data-title {
            font-size: 14px;
            color: var(--gray);
        }

        /* Section Layout */
        .section {
            padding: 80px 0;
        }

        .section:nth-child(even) {
            background-color: var(--white);
        }

        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-header h2 {
            font-size: 2rem;
            color: var(--dark);
            margin-bottom: 15px;
            font-weight: 700;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            width: 40px;
            height: 4px;
            background-color: var(--primary);
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }

        .section-header p {
            color: var(--gray);
            font-size: 16px;
        }

        /* About Section */
        .about-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: var(--dark);
        }

        .about-text p {
            margin-bottom: 15px;
            color: var(--dark-light);
            text-align: justify;
        }

        .about-features {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 30px;
        }

        .about-feat-item {
            background: var(--light);
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid var(--primary);
        }

        /* Service Cards */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .service-card {
            background-color: var(--white);
            border: 1px solid var(--border);
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            transition: all 0.3s;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px rgba(16, 185, 129, 0.08);
            border-color: var(--primary);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary);
            font-size: 24px;
            font-weight: bold;
        }

        .service-card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .service-card p {
            font-size: 14px;
            color: var(--dark-light);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 40px;
            justify-content: center;
        }

        .tag-cloud span {
            background: var(--primary-light);
            color: var(--primary-hover);
            padding: 5px 12px;
            border-radius: 15px;
            font-size: 12px;
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        /* Flow / Timeline */
        .timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .timeline-item {
            background: var(--white);
            padding: 25px;
            border-radius: 10px;
            position: relative;
            border: 1px solid var(--border);
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
        }

        .timeline-num {
            width: 32px;
            height: 32px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-bottom: 15px;
        }

        /* Comparison Table */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: var(--white);
            border-radius: 12px;
            border: 1px solid var(--border);
            padding: 10px;
        }

        .eval-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .eval-table th, .eval-table td {
            padding: 16px;
            border-bottom: 1px solid var(--border);
        }

        .eval-table th {
            background-color: var(--light);
            color: var(--dark);
            font-weight: 700;
        }

        .eval-table tr:last-child td {
            border-bottom: none;
        }

        .highlight-col {
            background-color: var(--primary-light);
            font-weight: bold;
        }

        .badge-star {
            color: #f59e0b;
            font-weight: bold;
        }

        .score-badge {
            background-color: var(--primary);
            color: var(--white);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
        }

        /* Cases Grid */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all 0.3s;
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        }

        .case-img-wrap {
            height: 200px;
            overflow: hidden;
            background-color: #eee;
        }

        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--dark);
        }

        .case-info p {
            font-size: 13px;
            color: var(--gray);
        }

        /* Form styling */
        .form-wrap {
            max-width: 600px;
            margin: 0 auto;
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
            border: 1px solid var(--border);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 14px;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            outline: none;
            transition: border-color 0.3s;
            font-size: 14px;
        }

        .form-control:focus {
            border-color: var(--primary);
        }

        .form-btn {
            width: 100%;
            background-color: var(--primary);
            color: var(--white);
            padding: 14px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background 0.3s;
        }

        .form-btn:hover {
            background-color: var(--primary-hover);
        }

        /* FAQ Section */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            border: 1px solid var(--border);
            margin-bottom: 12px;
            border-radius: 8px;
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            background-color: var(--white);
            transition: background-color 0.3s;
        }

        .faq-question:hover {
            background-color: var(--primary-light);
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            color: var(--dark-light);
            font-size: 14px;
            line-height: 1.6;
            border-top: 1px solid transparent;
        }

        .faq-item.active .faq-answer {
            padding: 18px 24px;
            max-height: 200px;
            border-top: 1px solid var(--border);
        }

        .faq-question::after {
            content: '+';
            font-size: 20px;
            color: var(--primary);
            transition: transform 0.3s;
        }

        .faq-item.active .faq-question::after {
            content: '-';
            transform: rotate(180deg);
        }

        /* Review Grid */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background: var(--white);
            padding: 25px;
            border-radius: 12px;
            border: 1px solid var(--border);
            box-shadow: 0 4px 6px rgba(0,0,0,0.01);
            position: relative;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
        }

        .review-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        .review-meta h5 {
            font-size: 14px;
            margin-bottom: 2px;
        }

        .review-meta span {
            font-size: 12px;
            color: var(--gray);
        }

        .review-content {
            font-size: 14px;
            color: var(--dark-light);
            font-style: italic;
        }

        /* Articles list */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .article-card {
            background: var(--white);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border);
            transition: all 0.3s;
        }

        .article-card:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .article-card h4 {
            font-size: 15px;
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .article-card a {
            color: var(--dark);
            transition: color 0.2s;
        }

        .article-card a:hover {
            color: var(--primary);
        }

        /* Footer */
        footer {
            background-color: #1f2937;
            color: #f3f4f6;
            padding: 60px 0 30px;
            border-top: 4px solid var(--primary);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 2fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 16px;
            color: var(--white);
            margin-bottom: 20px;
            position: relative;
        }

        .footer-col h4::after {
            content: '';
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            position: absolute;
            bottom: -6px;
            left: 0;
        }

        .footer-col p {
            font-size: 14px;
            color: #d1d5db;
            margin-bottom: 10px;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: #d1d5db;
            transition: color 0.2s;
        }

        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .qr-wrap {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .qr-card {
            text-align: center;
            background: #2d3748;
            padding: 10px;
            border-radius: 8px;
            width: 110px;
        }

        .qr-card img {
            width: 90px;
            height: 90px;
            margin-bottom: 5px;
            border-radius: 4px;
        }

        .qr-card span {
            font-size: 11px;
            color: #e5e7eb;
        }

        .friend-links {
            padding: 20px 0;
            border-top: 1px solid #374151;
            border-bottom: 1px solid #374151;
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            align-items: center;
        }

        .friend-links span {
            font-size: 14px;
            color: var(--gray);
        }

        .friend-links a {
            font-size: 14px;
            color: #d1d5db;
            transition: color 0.2s;
        }

        .friend-links a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer-bottom p {
            font-size: 13px;
            color: #9ca3af;
        }

        /* Float Widget */
        .float-widget {
            position: fixed;
            right: 20px;
            bottom: 40px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-item {
            width: 50px;
            height: 50px;
            background-color: var(--white);
            border-radius: 50%;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
            border: 1px solid var(--border);
        }

        .float-item:hover {
            background-color: var(--primary);
            color: var(--white);
            transform: scale(1.05);
        }

        .float-item svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        .float-popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: var(--white);
            border: 1px solid var(--border);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            display: none;
            width: 140px;
            text-align: center;
        }

        .float-popover img {
            width: 110px;
            height: 110px;
            margin-bottom: 5px;
        }

        .float-popover span {
            font-size: 12px;
            color: var(--dark);
            font-weight: bold;
        }

        .float-item:hover .float-popover {
            display: block;
        }

        /* Back to top button */
        #backToTop {
            display: none;
        }

        /* Responsive Styles */
        @media (max-width: 1024px) {
            .service-grid, .cases-grid, .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            nav {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--white);
                border-bottom: 1px solid var(--border);
                padding: 20px;
                box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            }
            nav.active {
                display: flex;
            }
            .about-wrap {
                grid-template-columns: 1fr;
            }
            .service-grid, .cases-grid, .review-grid, .article-grid {
                grid-template-columns: 1fr;
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }