* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
            background: #f9fbfd;
            color: #1a2a3a;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* 顶部导航 */
        .site-header {
            background: rgba(255,255,255,0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 80, 200, 0.08);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: box-shadow 0.2s;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 70px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            flex-shrink: 0;
        }
        .ai-page-logo {
            max-height: 44px;
            width: auto;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0; /* 按需求设置gap为0 */
            list-style: none;
        }
        .nav-links li {
            position: relative;
        }
        .nav-links a {
            display: inline-block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: #1e2b3c;
            text-decoration: none;
            border-radius: 40px;
            transition: background 0.2s, color 0.2s;
        }
        .nav-links a:hover {
            background: #eef4ff;
            color: #0b5ed7;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
            border: none;
            cursor: pointer;
            background: #fff;
            color: #0b5ed7;
            border: 1px solid #cde0ff;
        }
        .btn-primary {
            background: linear-gradient(135deg, #1e6dff, #6a4cff);
            color: #fff;
            border: none;
            box-shadow: 0 8px 20px -8px rgba(30, 109, 255, 0.4);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 14px 24px -8px rgba(30, 109, 255, 0.6);
        }
        .btn-outline {
            background: transparent;
            border: 1.5px solid #1e6dff;
            color: #1e6dff;
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 26px;
            cursor: pointer;
            color: #1e2b3c;
        }
        /* Hero 首屏（无图片） */
        .hero {
            background: linear-gradient(145deg, #f0f7ff 0%, #ffffff 40%, #f5efff 100%);
            padding: 60px 0 70px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(106, 76, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-content {
            text-align: center;
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(30, 109, 255, 0.1);
            color: #0b5ed7;
            font-weight: 600;
            font-size: 14px;
            padding: 6px 18px;
            border-radius: 40px;
            margin-bottom: 22px;
            border: 1px solid rgba(30, 109, 255, 0.2);
        }
        .hero h1 {
            font-size: clamp(2rem, 6vw, 3.4rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
            color: #0a1a2b;
            margin-bottom: 20px;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #1e6dff, #9f5cff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-desc {
            font-size: 1.2rem;
            color: #3d4e62;
            max-width: 680px;
            margin: 0 auto 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            margin-bottom: 40px;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 28px 48px;
            background: rgba(255,255,255,0.7);
            backdrop-filter: blur(8px);
            padding: 24px 32px;
            border-radius: 60px;
            border: 1px solid rgba(255,255,255,0.8);
            box-shadow: 0 12px 30px -12px rgba(0, 60, 150, 0.12);
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-number {
            font-size: 1.9rem;
            font-weight: 800;
            color: #0b1c2e;
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 0.9rem;
            color: #4a5c6e;
            font-weight: 500;
        }
        /* 通用区块 */
        .section {
            padding: 70px 0;
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px;
        }
        .section-header h2 {
            font-size: 2.1rem;
            font-weight: 700;
            color: #0a1a2b;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 1.1rem;
            color: #4b5d6f;
        }
        /* 卡片网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .card {
            background: #ffffff;
            border-radius: 28px;
            padding: 28px 24px;
            box-shadow: 0 6px 22px -10px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9f0f8;
            transition: transform 0.25s, box-shadow 0.3s, border-color 0.2s;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: 0 24px 36px -16px rgba(30, 90, 200, 0.18);
            border-color: #cddfff;
        }
        .card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: #0c1e30;
        }
        .card p {
            color: #4c5f72;
            font-size: 0.96rem;
        }
        .icon-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 18px;
            background: linear-gradient(145deg, #e0ebff, #ffffff);
            color: #1e6dff;
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 18px;
            box-shadow: 0 6px 12px -6px rgba(30, 109, 255, 0.2);
        }
        /* 流程步骤 */
        .steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 18px;
            counter-reset: step;
        }
        .step-item {
            flex: 1 0 160px;
            background: #fff;
            border-radius: 24px;
            padding: 24px 16px;
            text-align: center;
            border: 1px solid #e3ecfa;
            box-shadow: 0 4px 10px -6px rgba(0,0,0,0.02);
            transition: all 0.2s;
        }
        .step-item:hover {
            border-color: #b6d0ff;
            background: #fafdff;
        }
        .step-num {
            width: 40px;
            height: 40px;
            margin: 0 auto 14px;
            background: linear-gradient(135deg, #1e6dff, #6a4cff);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
        }
        .step-item h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
            color: #0f2136;
        }
        .step-item p {
            font-size: 0.88rem;
            color: #5a6e82;
        }
        /* 表格 */
        .table-wrap {
            overflow-x: auto;
            background: #ffffff;
            border-radius: 24px;
            border: 1px solid #e7eff9;
            box-shadow: 0 8px 20px -12px rgba(0, 0, 0, 0.08);
            margin-top: 16px;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 680px;
            font-size: 0.95rem;
        }
        .compare-table th {
            text-align: left;
            padding: 18px 20px;
            background: #f2f8ff;
            font-weight: 600;
            color: #0a253c;
            border-bottom: 2px solid #d7e6ff;
        }
        .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid #eef3fa;
            color: #2b3e52;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .rating-stars {
            color: #ffb400;
            font-size: 1.2rem;
            letter-spacing: 2px;
        }
        .score {
            font-weight: 800;
            color: #1e6dff;
            font-size: 1.3rem;
        }
        /* FAQ 手风琴 */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 900px;
            margin: 0 auto;
        }
        .faq-item {
            background: #ffffff;
            border-radius: 20px;
            border: 1px solid #e6eefb;
            transition: all 0.2s;
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            color: #0a1f34;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            list-style: none;
            font-size: 1.02rem;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.6rem;
            font-weight: 300;
            color: #1e6dff;
            transition: transform 0.2s;
        }
        .faq-item.active .faq-question::after {
            content: '−';
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.2s;
            padding: 0 24px;
            color: #3d4f62;
            border-top: 1px solid transparent;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 0 24px 20px;
            border-top-color: #eef3fc;
        }
        /* 用户评论 */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .review-card {
            background: #ffffff;
            padding: 26px 22px;
            border-radius: 24px;
            border: 1px solid #e9f0fa;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .review-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 28px -16px rgba(0, 70, 150, 0.12);
        }
        .review-stars {
            color: #ffb400;
            font-size: 1.1rem;
            letter-spacing: 2px;
            margin-bottom: 14px;
        }
        .review-text {
            color: #2b3e52;
            font-size: 0.96rem;
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .review-user {
            font-weight: 600;
            color: #0a1f34;
            font-size: 0.92rem;
        }
        /* 案例展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .case-card {
            background: #fff;
            border-radius: 28px;
            overflow: hidden;
            border: 1px solid #e3ecfa;
            transition: all 0.2s;
        }
        .case-card:hover {
            border-color: #b8d2ff;
            box-shadow: 0 16px 28px -16px rgba(30, 109, 255, 0.2);
        }
        .case-img-wrap {
            width: 100%;
            aspect-ratio: 16 / 9;
            background: #f0f5fe;
            overflow: hidden;
        }
        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform 0.35s;
        }
        .case-card:hover .case-img-wrap img {
            transform: scale(1.02);
        }
        .case-info {
            padding: 20px 22px;
        }
        .case-info h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
            color: #0c1f34;
        }
        .case-info p {
            font-size: 0.9rem;
            color: #556c82;
        }
        /* 表单 */
        .form-card {
            background: #ffffff;
            border-radius: 32px;
            padding: 40px 36px;
            box-shadow: 0 20px 40px -24px rgba(0, 50, 120, 0.2);
            border: 1px solid #e4eefb;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 22px;
            margin-bottom: 20px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            font-weight: 600;
            font-size: 0.92rem;
            color: #0c1f34;
            margin-bottom: 6px;
        }
        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 13px 16px;
            border-radius: 18px;
            border: 1px solid #d9e4f5;
            font-size: 0.96rem;
            font-family: inherit;
            transition: border 0.2s, box-shadow 0.2s;
            background: #fafcff;
        }
        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: #1e6dff;
            box-shadow: 0 0 0 4px rgba(30, 109, 255, 0.1);
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-submit {
            width: 100%;
            padding: 16px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            margin-top: 12px;
            background: linear-gradient(135deg, #1e6dff, #6a4cff);
            color: #fff;
            border: none;
            box-shadow: 0 14px 24px -10px #1e6dff;
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.2s;
        }
        .form-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 20px 30px -12px #1e6dff;
        }
        /* 文章列表、友情链接 */
        .article-list {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .article-tag {
            background: #ecf3ff;
            padding: 8px 22px;
            border-radius: 40px;
            color: #0b5ed7;
            font-weight: 500;
            text-decoration: none;
            transition: background 0.2s, color 0.2s;
            font-size: 0.94rem;
        }
        .article-tag:hover {
            background: #1e6dff;
            color: #fff;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            justify-content: center;
            padding: 24px 0 10px;
        }
        .friend-links a {
            color: #2d4b69;
            text-decoration: none;
            font-size: 0.92rem;
            transition: color 0.2s;
        }
        .friend-links a:hover {
            color: #0b5ed7;
            text-decoration: underline;
        }
        /* 浮动客服 */
        .float-service {
            position: fixed;
            right: 24px;
            bottom: 100px;
            background: #fff;
            border-radius: 60px;
            padding: 8px;
            box-shadow: 0 10px 30px -8px rgba(0, 0, 0, 0.15);
            border: 1px solid #e3ecfa;
            z-index: 90;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            transition: transform 0.2s;
        }
        .float-service:hover {
            transform: scale(1.03);
        }
        .float-service img {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            object-fit: cover;
            display: block;
        }
        .float-service span {
            font-size: 0.7rem;
            font-weight: 600;
            color: #1e6dff;
            white-space: nowrap;
        }
        .back-top {
            position: fixed;
            right: 30px;
            bottom: 30px;
            width: 48px;
            height: 48px;
            border-radius: 40px;
            background: #ffffff;
            border: 1px solid #d9e6ff;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #1e6dff;
            font-size: 20px;
            box-shadow: 0 8px 20px -8px rgba(0,0,0,0.1);
            cursor: pointer;
            transition: background 0.2s;
            z-index: 90;
            text-decoration: none;
        }
        .back-top:hover {
            background: #f0f6ff;
        }
        /* footer */
        .site-footer {
            background: #0e1d2f;
            color: #b0c7df;
            padding: 50px 0 28px;
            margin-top: 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1.2fr 1.2fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand p {
            color: #91a9c2;
            margin: 12px 0 16px;
            max-width: 300px;
            font-size: 0.92rem;
        }
        .footer-logo img {
            max-height: 40px;
            
        }
        .footer-col h5 {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 10px;
        }
        .footer-col a {
            color: #b0c7df;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            border-top: 1px solid #1f3348;
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 0.82rem;
            color: #7c95af;
        }
        .footer-contact {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
        }
        /* 动画 */
        .fade-up {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }
        /* 响应式 */
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                padding: 16px 0;
                border-radius: 24px;
                box-shadow: 0 16px 30px -10px rgba(0,0,0,0.1);
                position: absolute;
                top: 70px;
                left: 0;
                gap: 4px;
                border: 1px solid #e7eff9;
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .nav-bar {
                flex-wrap: wrap;
            }
            .nav-cta {
                margin-left: auto;
                margin-right: 12px;
            }
            .nav-cta .btn {
                padding: 8px 16px;
                font-size: 13px;
            }
            .grid-3, .grid-2, .review-grid, .case-grid {
                grid-template-columns: 1fr;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .hero-stats {
                border-radius: 30px;
                gap: 20px 30px;
            }
            .section {
                padding: 50px 0;
            }
            .float-service {
                right: 16px;
                bottom: 90px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 18px;
            }
            .hero h1 {
                font-size: 1.9rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
        }