/* 核心重置与黑白胶片风格 */
        :root {
            --bg-primary: #f7f7f7;
            --bg-card: #ffffff;
            --text-primary: #111111;
            --text-muted: #666666;
            --border-color: #222222;
            --border-light: #e0e0e0;
            --accent: #000000;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --container-max: 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, sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        /* 布局容器 */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-light);
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            border-bottom: 2px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(10px);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
        }

        .ai-page-logo {
            height: 40px;
            width: auto;
            filter: grayscale(100%);
        }

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

        .nav-links a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 500;
            font-size: 14px;
            text-transform: uppercase;
            transition: var(--transition);
            padding: 6px 0;
            border-bottom: 2px solid transparent;
        }

        .nav-links a:hover {
            border-bottom: 2px solid var(--border-color);
        }

        .nav-cta {
            background-color: var(--accent);
            color: #fff !important;
            padding: 8px 16px !important;
            border-radius: 0;
            border: 1px solid var(--accent);
        }

        .nav-cta:hover {
            background-color: transparent !important;
            color: var(--text-primary) !important;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 10px;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 2px;
            background: var(--text-primary);
            margin: 5px 0;
            transition: var(--transition);
        }

        /* 胶片风格排版 */
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-header .meta-tag {
            font-family: Georgia, serif;
            font-style: italic;
            color: var(--text-muted);
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: block;
            margin-bottom: 10px;
        }

        .section-header h2 {
            font-family: Georgia, serif;
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.5px;
            text-transform: uppercase;
            position: relative;
            display: inline-block;
            padding-bottom: 10px;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 3px;
            background-color: var(--border-color);
        }

        /* 首屏 Hero (无图片) */
        .hero {
            background-color: var(--bg-card);
            border-bottom: 4px solid var(--border-color);
            padding: 120px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: radial-gradient(var(--border-light) 1px, transparent 0);
            background-size: 24px 24px;
            opacity: 0.3;
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
            z-index: 1;
        }

        .hero-tag {
            display: inline-block;
            border: 1px solid var(--border-color);
            padding: 4px 12px;
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 24px;
            background-color: var(--bg-primary);
        }

        .hero h1 {
            font-family: Georgia, serif;
            font-size: 46px;
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 900;
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 650px;
            margin: 0 auto 40px;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
        }

        .btn {
            display: inline-block;
            padding: 14px 28px;
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border-radius: 0;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        .btn-black {
            background-color: var(--accent);
            color: #fff;
            border: 2px solid var(--accent);
        }

        .btn-black:hover {
            background-color: transparent;
            color: var(--accent);
        }

        .btn-outline {
            background-color: transparent;
            color: var(--accent);
            border: 2px solid var(--border-color);
        }

        .btn-outline:hover {
            background-color: var(--accent);
            color: #fff;
        }

        /* 关于我们与数据指标 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-text h3 {
            font-family: Georgia, serif;
            font-size: 24px;
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .metric-card {
            border: 1px solid var(--border-color);
            padding: 30px 20px;
            text-align: center;
            background-color: var(--bg-card);
            position: relative;
        }

        .metric-card::after {
            content: '';
            position: absolute;
            bottom: 4px;
            right: 4px;
            width: 8px;
            height: 8px;
            background-color: var(--border-color);
        }

        .metric-num {
            font-family: Georgia, serif;
            font-size: 40px;
            font-weight: 700;
            display: block;
            margin-bottom: 10px;
        }

        .metric-label {
            font-size: 12px;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* AIGC 服务体系 */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-light);
            padding: 30px;
            transition: var(--transition);
        }

        .service-card:hover {
            border-color: var(--border-color);
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        }

        .service-icon {
            font-size: 28px;
            margin-bottom: 20px;
            display: block;
        }

        .service-card h3 {
            font-size: 18px;
            margin-bottom: 12px;
        }

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

        /* 制作流程 & 时间线 */
        .workflow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 30px 20px;
            text-align: center;
            position: relative;
        }

        .step-num {
            font-family: Georgia, serif;
            font-style: italic;
            font-size: 48px;
            color: #ddd;
            display: block;
            margin-bottom: 10px;
        }

        .step-item h3 {
            font-size: 16px;
            margin-bottom: 10px;
        }

        .step-item p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 解决方案 */
        .solution-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .solution-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border-light);
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .solution-tag {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-muted);
            margin-bottom: 15px;
            display: block;
        }

        .solution-item h3 {
            font-size: 22px;
            margin-bottom: 15px;
        }

        .solution-item p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 25px;
        }

        .platform-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 15px;
        }

        .platform-tag {
            background-color: var(--bg-primary);
            border: 1px solid var(--border-light);
            padding: 4px 10px;
            font-size: 11px;
            color: var(--text-primary);
        }

        /* 服务网络与标准化 */
        .network-section {
            background-color: var(--bg-card);
        }

        .network-container {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 60px;
        }

        .network-info h3 {
            font-size: 24px;
            margin-bottom: 20px;
        }

        .network-list {
            list-style: none;
        }

        .network-list li {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            font-size: 14px;
        }

        .network-list li span {
            font-weight: 600;
        }

        /* 对比评测 */
        .evaluation-box {
            background-color: var(--text-primary);
            color: #fff;
            padding: 50px;
            display: grid;
            grid-template-columns: 1.2fr 2fr;
            gap: 50px;
            align-items: center;
        }

        .eval-score {
            text-align: center;
            border-right: 1px solid #333;
            padding-right: 50px;
        }

        .eval-score h3 {
            font-size: 18px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: #aaa;
            margin-bottom: 10px;
        }

        .score-num {
            font-family: Georgia, serif;
            font-size: 72px;
            font-weight: 700;
            line-height: 1;
            display: block;
        }

        .score-stars {
            color: #fff;
            font-size: 20px;
            margin-top: 10px;
        }

        .eval-details table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        .eval-details th, .eval-details td {
            padding: 12px 10px;
            text-align: left;
            border-bottom: 1px solid #333;
        }

        .eval-details th {
            color: #aaa;
            font-weight: 500;
        }

        /* Token 比价 */
        .price-table-container {
            overflow-x: auto;
        }

        .price-table {
            width: 100%;
            border-collapse: collapse;
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
        }

        .price-table th, .price-table td {
            padding: 16px 20px;
            text-align: left;
            border: 1px solid var(--border-light);
            font-size: 14px;
        }

        .price-table th {
            background-color: var(--text-primary);
            color: #fff;
            font-weight: 600;
            text-transform: uppercase;
        }

        .price-table tr:hover {
            background-color: var(--bg-primary);
        }

        /* 案例展示区 */
        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .portfolio-item {
            border: 1px solid var(--border-color);
            background-color: var(--bg-card);
            padding: 15px;
            display: flex;
            flex-direction: column;
        }

        .portfolio-img-wrapper {
            width: 100%;
            height: 250px;
            overflow: hidden;
            border-bottom: 1px solid var(--border-light);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #eee;
        }

        .portfolio-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: grayscale(100%);
            transition: var(--transition);
        }

        .portfolio-item:hover img {
            filter: grayscale(0%);
            transform: scale(1.05);
        }

        .portfolio-info h4 {
            font-size: 16px;
            margin-bottom: 5px;
        }

        .portfolio-info p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 培训中心 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .training-card {
            border: 1px solid var(--border-color);
            background-color: var(--bg-card);
            padding: 24px;
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            background-color: var(--text-primary);
            color: #fff;
        }

        .training-card h4 {
            font-size: 16px;
            margin-bottom: 10px;
        }

        .training-card p {
            font-size: 12px;
            color: var(--text-muted);
        }

        .training-card:hover p {
            color: #ccc;
        }

        /* 客户评价 */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .comment-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-light);
            padding: 30px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .comment-text {
            font-size: 14px;
            color: var(--text-muted);
            font-style: italic;
            margin-bottom: 20px;
            position: relative;
        }

        .comment-author {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid var(--border-light);
            padding-top: 15px;
        }

        .author-info h4 {
            font-size: 14px;
        }

        .author-info p {
            font-size: 11px;
            color: var(--text-muted);
        }

        /* FAQ 折叠面板 */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 15px 0;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            padding: 10px 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.6;
        }

        .faq-item.active .faq-answer {
            max-height: 150px;
            padding-bottom: 15px;
        }

        .faq-icon::after {
            content: '+';
            font-size: 20px;
        }

        .faq-item.active .faq-icon::after {
            content: '-';
        }

        /* 自助排查与术语百科 */
        .trouble-glossary {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
        }

        .trouble-card, .glossary-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-light);
            padding: 30px;
        }

        .trouble-card h3, .glossary-card h3 {
            font-size: 20px;
            margin-bottom: 20px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 10px;
        }

        .trouble-steps li {
            margin-bottom: 15px;
            list-style-type: decimal;
            list-style-position: inside;
            font-size: 14px;
            color: var(--text-muted);
        }

        .glossary-list dt {
            font-weight: 600;
            font-size: 14px;
            margin-top: 12px;
        }

        .glossary-list dd {
            font-size: 13px;
            color: var(--text-muted);
            margin-left: 0;
            margin-bottom: 8px;
        }

        /* 行业资讯 & 知识库 */
        .articles-container {
            background-color: var(--bg-card);
            padding: 40px;
            border: 1px solid var(--border-color);
        }

        .articles-list {
            list-style: none;
        }

        .articles-list li {
            padding: 15px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .articles-list li:last-child {
            border-bottom: none;
        }

        .articles-list a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
            transition: var(--transition);
        }

        .articles-list a:hover {
            text-decoration: underline;
        }

        .article-date {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 表单与需求匹配 */
        .form-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 50px;
            align-items: flex-start;
        }

        .contact-form {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 40px;
        }

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

        .form-group label {
            display: block;
            font-size: 12px;
            text-transform: uppercase;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-light);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-size: 14px;
            border-radius: 0;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--border-color);
            background-color: #fff;
        }

        .contact-info-card {
            background-color: var(--text-primary);
            color: #fff;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            height: 100%;
        }

        .contact-info-card h3 {
            font-size: 24px;
            margin-bottom: 20px;
            font-family: Georgia, serif;
        }

        .info-item {
            margin-bottom: 25px;
        }

        .info-item h4 {
            font-size: 12px;
            text-transform: uppercase;
            color: #aaa;
            margin-bottom: 5px;
        }

        .info-item p {
            font-size: 15px;
        }

        .qrcode-box {
            margin-top: 20px;
            border-top: 1px solid #333;
            padding-top: 20px;
            text-align: center;
        }

        .qrcode-box img {
            width: 130px;
            height: 130px;
            border: 4px solid #fff;
            margin-bottom: 10px;
        }

        .qrcode-box p {
            font-size: 12px;
            color: #ccc;
        }

        /* 底部与友情链接 */
        footer {
            background-color: #111;
            color: #fff;
            padding: 60px 0 30px;
            border-top: 4px solid var(--border-color);
        }

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

        .footer-brand h3 {
            font-family: Georgia, serif;
            font-size: 22px;
            margin-bottom: 15px;
        }

        .footer-brand p {
            font-size: 13px;
            color: #999;
            line-height: 1.8;
        }

        .footer-links h4 {
            font-size: 14px;
            text-transform: uppercase;
            margin-bottom: 20px;
            letter-spacing: 1px;
            border-bottom: 1px solid #333;
            padding-bottom: 10px;
        }

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

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

        .footer-links a {
            color: #ccc;
            text-decoration: none;
            font-size: 13px;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
            text-decoration: underline;
        }

        .friend-links-area {
            border-top: 1px solid #222;
            padding-top: 20px;
            margin-top: 20px;
            font-size: 12px;
            color: #666;
        }

        .friend-links-area a {
            color: #888;
            text-decoration: none;
            margin-right: 15px;
            transition: var(--transition);
        }

        .friend-links-area a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #222;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: #666;
        }

        /* 侧边悬浮组件 */
        .floating-widget {
            position: fixed;
            right: 20px;
            bottom: 80px;
            z-index: 99;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .widget-btn {
            width: 44px;
            height: 44px;
            background-color: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 12px;
            cursor: pointer;
            border: 1px solid var(--border-color);
            position: relative;
            transition: var(--transition);
        }

        .widget-btn:hover {
            background-color: #fff;
            color: var(--accent);
        }

        .widget-kefu-pop {
            display: none;
            position: absolute;
            right: 55px;
            bottom: 0;
            background-color: #fff;
            border: 2px solid var(--border-color);
            padding: 15px;
            text-align: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
        }

        .widget-kefu-pop img {
            width: 100px;
            height: 100px;
            display: block;
            margin-bottom: 8px;
        }

        .widget-kefu-pop p {
            color: #111;
            font-size: 11px;
            white-space: nowrap;
        }

        .widget-kefu-trigger:hover .widget-kefu-pop {
            display: block;
        }

        /* 移动端响应式适配 */
        @media (max-width: 992px) {
            .about-grid, .solution-grid, .network-container, .evaluation-box, .form-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .evaluation-box {
                padding: 30px;
            }

            .eval-score {
                border-right: none;
                border-bottom: 1px solid #333;
                padding-right: 0;
                padding-bottom: 30px;
            }

            .workflow-steps {
                grid-template-columns: repeat(2, 1fr);
            }

            .comments-grid, .portfolio-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: #fff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 2px solid var(--border-color);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }

            .nav-links.active {
                display: flex;
            }

            .menu-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 32px;
            }

            .workflow-steps {
                grid-template-columns: 1fr;
            }

            .comments-grid, .portfolio-grid {
                grid-template-columns: 1fr;
            }

            .trouble-glossary {
                grid-template-columns: 1fr;
            }
        }