/* 基础重置 & 黑白胶片风格核心变量 */
        :root {
            --color-bg: #ffffff;
            --color-bg-alt: #f8f8f8;
            --color-text-main: #111111;
            --color-text-muted: #555555;
            --color-border: #222222;
            --color-border-light: #e0e0e0;
            --font-display: "Playfair Display", "Didot", "Georgia", "Source Han Serif SC", "Songti SC", serif;
            --font-sans: "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max-width: 1200px;
        }

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

        body {
            background-color: var(--color-bg);
            color: var(--color-text-main);
            font-family: var(--font-sans);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* 网格纹理背景，模拟胶片微粒 */
        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background-image: 
                radial-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px);
            background-size: 24px 24px;
            pointer-events: none;
            z-index: 9999;
            opacity: 0.8;
        }

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

        /* 标题样式 */
        h1, h2, h3, h4 {
            font-family: var(--font-display);
            font-weight: 700;
            letter-spacing: -0.02em;
            text-transform: uppercase;
        }

        p {
            color: var(--color-text-muted);
            font-size: 0.95rem;
        }

        a {
            color: var(--color-text-main);
            text-decoration: none;
            transition: all 0.3s ease;
        }

        /* 按钮设计：经典胶片框线与黑白反转 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 0.9rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            border: 2px solid var(--color-border);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            background: transparent;
            color: var(--color-text-main);
        }

        .btn-primary {
            background: var(--color-text-main);
            color: var(--color-bg);
        }

        .btn-primary:hover {
            background: transparent;
            color: var(--color-text-main);
        }

        .btn-secondary:hover {
            background: var(--color-text-main);
            color: var(--color-bg);
        }

        /* 导航栏 */
        header {
            border-bottom: 2px solid var(--color-border);
            position: sticky;
            top: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

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

        .ai-page-logo {
            height: 40px;
            filter: grayscale(1);
        }

        .nav-menu {
            display: flex;
            gap: 24px;
            align-items: center;
        }

        .nav-menu a {
            font-size: 0.85rem;
            font-weight: 500;
            text-transform: uppercase;
            padding: 6px 0;
            border-bottom: 1px solid transparent;
        }

        .nav-menu a:hover {
            border-color: var(--color-border);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text-main);
        }

        /* 页面区块通用样式 */
        section {
            padding: 100px 0;
            border-bottom: 1px solid var(--color-border-light);
        }

        .section-header {
            max-width: 800px;
            margin-bottom: 60px;
        }

        .section-tag {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.2em;
            color: var(--color-text-muted);
            margin-bottom: 12px;
            display: block;
        }

        .section-title {
            font-size: 2.5rem;
            line-height: 1.2;
            color: var(--color-text-main);
            margin-bottom: 16px;
        }

        /* 首屏 Hero 区 - 完全无图 */
        .hero-section {
            background-color: var(--color-bg);
            padding: 120px 0 100px;
            text-align: center;
            position: relative;
            border-bottom: 2px solid var(--color-border);
        }

        .hero-badge {
            display: inline-block;
            padding: 4px 12px;
            border: 1px solid var(--color-border);
            font-size: 0.75rem;
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }

        .hero-title {
            font-size: 4rem;
            line-height: 1.1;
            margin-bottom: 24px;
            max-width: 950px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 40px;
            line-height: 1.6;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 60px;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            border-top: 1px solid var(--color-border-light);
            padding-top: 40px;
            text-align: left;
        }

        .stat-item h3 {
            font-size: 2rem;
            margin-bottom: 4px;
        }

        .stat-item p {
            font-size: 0.8rem;
        }

        /* 关于我们与软件介绍 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
        }

        .about-text p {
            margin-bottom: 20px;
        }

        .platform-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .feature-box {
            border: 1px solid var(--color-border);
            padding: 24px;
            transition: transform 0.3s ease;
        }

        .feature-box:hover {
            transform: translateY(-4px);
        }

        .feature-box h4 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        /* 服务体系 - 场景与平台 */
        .service-tabs {
            margin-bottom: 40px;
            border-bottom: 1px solid var(--color-border-light);
            display: flex;
            gap: 24px;
        }

        .tab-btn {
            background: none;
            border: none;
            padding: 12px 0;
            font-family: var(--font-display);
            font-size: 1.1rem;
            cursor: pointer;
            border-bottom: 2px solid transparent;
            color: var(--color-text-muted);
        }

        .tab-btn.active {
            color: var(--color-text-main);
            border-color: var(--color-border);
        }

        .service-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .service-card {
            border: 1px solid var(--color-border-light);
            padding: 30px 24px;
            transition: all 0.3s ease;
        }

        .service-card:hover {
            border-color: var(--color-border);
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .service-card .icon {
            font-size: 2rem;
            margin-bottom: 20px;
        }

        .service-card h4 {
            font-size: 1.2rem;
            margin-bottom: 12px;
        }

        /* 平台云 */
        .platform-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 30px;
        }

        .platform-tag {
            padding: 6px 14px;
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border-light);
            font-size: 0.8rem;
            transition: all 0.3s ease;
        }

        .platform-tag:hover {
            background: var(--color-text-main);
            color: var(--color-bg);
            border-color: var(--color-text-main);
        }

        /* 流程与步骤 */
        .flow-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .flow-step {
            position: relative;
            padding-top: 30px;
            border-top: 2px solid var(--color-border);
        }

        .flow-step::before {
            content: "";
            position: absolute;
            top: -6px;
            left: 0;
            width: 10px;
            height: 10px;
            background: var(--color-text-main);
            border-radius: 50%;
        }

        .step-num {
            font-family: var(--font-display);
            font-size: 1.5rem;
            margin-bottom: 12px;
            display: block;
        }

        .flow-step h4 {
            margin-bottom: 8px;
        }

        /* 服务网络与技术标准 */
        .network-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
        }

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

        .network-list li {
            padding: 16px 0;
            border-bottom: 1px solid var(--color-border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

        /* 案例中心 - 带图 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        .case-card {
            border: 1px solid var(--color-border);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .case-img-wrapper {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            border-bottom: 1px solid var(--color-border);
            background: #eee;
        }

        .case-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: grayscale(1);
            transition: filter 0.5s ease, transform 0.5s ease;
        }

        .case-card:hover .case-img-wrapper img {
            filter: grayscale(0);
            transform: scale(1.05);
        }

        .case-info {
            padding: 30px;
        }

        .case-info h4 {
            font-size: 1.4rem;
            margin-bottom: 12px;
        }

        /* 对比评测 */
        .rating-badge {
            display: inline-flex;
            align-items: baseline;
            gap: 8px;
            background: var(--color-text-main);
            color: var(--color-bg);
            padding: 12px 24px;
            margin-bottom: 30px;
        }

        .rating-num {
            font-size: 2.5rem;
            font-family: var(--font-display);
            font-weight: 700;
        }

        .comparison-table-wrapper {
            overflow-x: auto;
        }

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

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

        .comparison-table th {
            background: var(--color-bg-alt);
            font-weight: 600;
        }

        .comparison-table tr:hover td {
            background: var(--color-bg-alt);
        }

        /* Token 比价 */
        .token-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            margin-bottom: 40px;
        }

        /* 培训版块 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .training-card h4 {
            font-size: 1.2rem;
            margin-bottom: 12px;
        }

        .training-card ul {
            list-style: square;
            padding-left: 20px;
            margin-bottom: 24px;
            color: var(--color-text-muted);
            font-size: 0.9rem;
        }

        /* 用户评论 */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .comment-text {
            font-style: italic;
            margin-bottom: 24px;
            color: var(--color-text-main);
        }

        .comment-author {
            display: flex;
            flex-direction: column;
        }

        .comment-author span:first-child {
            font-weight: 700;
            font-size: 0.9rem;
        }

        .comment-author span:last-child {
            font-size: 0.75rem;
            color: var(--color-text-muted);
        }

        /* 智能匹配与表单 */
        .form-section {
            background: var(--color-bg-alt);
            border-top: 2px solid var(--color-border);
            border-bottom: 2px solid var(--color-border);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
        }

        .custom-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group label {
            font-size: 0.85rem;
            font-weight: 600;
            text-transform: uppercase;
        }

        .form-group input, .form-group select, .form-group textarea {
            padding: 12px;
            border: 1px solid var(--color-border);
            background: var(--color-bg);
            color: var(--color-text-main);
            font-family: var(--font-sans);
            outline: none;
        }

        .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
            border-color: var(--color-border);
            box-shadow: 0 0 0 2px rgba(0,0,0,0.05);
        }

        /* FAQ 折叠面板 */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            border: 1px solid var(--color-border-light);
        }

        .faq-question {
            padding: 20px 24px;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.5rem;
            font-family: var(--font-display);
        }

        .faq-item.active .faq-question::after {
            content: "−";
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background: var(--color-bg-alt);
        }

        .faq-answer p {
            padding: 24px;
            font-size: 0.9rem;
        }

        /* 自助排查与百科 */
        .kb-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .kb-box h3 {
            font-size: 1.4rem;
            margin-bottom: 24px;
            border-bottom: 2px solid var(--color-border);
            padding-bottom: 12px;
        }

        .step-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .step-item {
            display: flex;
            gap: 16px;
        }

        .step-item-num {
            font-family: var(--font-display);
            font-size: 1.2rem;
            font-weight: 700;
        }

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

        .term-item dt {
            font-weight: 700;
            margin-bottom: 4px;
        }

        .term-item dd {
            font-size: 0.85rem;
            color: var(--color-text-muted);
        }

        /* 行业资讯 / 知识库 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            border: 1px solid var(--color-border-light);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 240px;
            transition: all 0.3s ease;
        }

        .article-card:hover {
            border-color: var(--color-border);
            background: var(--color-bg-alt);
        }

        .article-meta {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .article-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 16px;
            line-height: 1.4;
        }

        .article-link {
            font-size: 0.85rem;
            font-weight: 700;
            text-decoration: underline;
        }

        /* 联系我们与页脚 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .contact-method {
            display: flex;
            gap: 16px;
            align-items: center;
        }

        .contact-method .icon-box {
            width: 48px;
            height: 48px;
            border: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }

        .contact-channels {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 20px;
        }

        .channel-card {
            border: 1px solid var(--color-border-light);
            padding: 20px;
            text-align: center;
        }

        .channel-card img {
            max-width: 120px;
            margin: 0 auto 12px;
            display: block;
        }

        footer {
            background: var(--color-text-main);
            color: var(--color-bg);
            padding: 60px 0 30px;
            font-size: 0.85rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
            border-bottom: 1px solid #333;
            padding-bottom: 40px;
        }

        .footer-logo {
            filter: brightness(0) invert(1);
            height: 32px;
            margin-bottom: 16px;
        }

        .footer-col h5 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 0.9rem;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            color: #999;
        }

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

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 20px;
        }

        .friend-links a {
            color: #999;
            text-decoration: underline;
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            color: #666;
        }

        /* 悬浮小挂件 */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 48px;
            height: 48px;
            background: var(--color-bg);
            border: 2px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            transition: all 0.3s ease;
        }

        .float-btn:hover {
            background: var(--color-text-main);
            color: var(--color-bg);
        }

        .float-btn svg {
            width: 20px;
            height: 20px;
            fill: currentColor;
        }

        .qr-popup {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--color-bg);
            border: 2px solid var(--color-border);
            padding: 16px;
            display: none;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .qr-popup img {
            width: 140px;
            height: 140px;
        }

        .float-btn-qr:hover .qr-popup {
            display: block;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .hero-title { font-size: 3rem; }
            .about-grid, .network-grid, .form-grid, .kb-grid, .contact-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .service-grid, .training-grid, .comments-grid, .article-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-timeline {
                grid-template-columns: repeat(2, 1fr);
                gap: 40px;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background: var(--color-bg);
                border-bottom: 2px solid var(--color-border);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-toggle {
                display: flex;
            }
            .hero-title { font-size: 2.2rem; }
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .service-grid, .training-grid, .comments-grid, .article-grid, .case-grid {
                grid-template-columns: 1fr;
            }
            .flow-timeline {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }