/* 全局重置与设计变量 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #ff3b3b;
            --primary-dark: #cc0000;
            --accent: #ff9f00;
            --accent-light: #ffdd55;
            --blue: #1e6ef6;
            --blue-light: #4a90ff;
            --dark: #0b0f19;
            --dark-2: #1a1f2e;
            --gray-bg: #f5f7fb;
            --gray-text: #4a4e5a;
            --white: #ffffff;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow-sm: 0 4px 12px rgba(0,0,0,0.05);
            --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
            --shadow-lg: 0 20px 50px rgba(0,0,0,0.12);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--white);
            color: var(--dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        ul, ol {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--gray-text);
            max-width: 680px;
            margin-bottom: 48px;
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            letter-spacing: 0.3px;
            line-height: 1.4;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), #ff6b00);
            color: var(--white);
            box-shadow: 0 8px 24px rgba(255, 59, 59, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(255, 59, 59, 0.5);
        }
        .btn-outline {
            background: transparent;
            color: var(--white);
            border: 2px solid rgba(255,255,255,0.4);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: var(--white);
            transform: translateY(-3px);
        }
        .btn-blue {
            background: var(--blue);
            color: var(--white);
            box-shadow: 0 8px 24px rgba(30, 110, 246, 0.3);
        }
        .btn-blue:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(30, 110, 246, 0.45);
        }
        .btn-sm {
            padding: 10px 24px;
            font-size: 0.9rem;
        }
        /* 顶部导航 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(11, 15, 25, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .ai-page-logo {
            max-height: 40px;
            width: auto;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0;
            flex-wrap: nowrap;
        }
        .nav-links a {
            color: rgba(255,255,255,0.75);
            font-size: 0.88rem;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--white);
            background: rgba(255,255,255,0.08);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            background: transparent;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--white);
            border-radius: 2px;
            transition: var(--transition);
        }
        /* Hero 首屏 — 无图片 */
        .hero {
            position: relative;
            background: radial-gradient(circle at 20% 50%, #1a1f3a 0%, #0b0f19 55%, #0b0f19 100%);
            padding: 160px 0 100px;
            overflow: hidden;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            width: 700px;
            height: 700px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255,59,59,0.12) 0%, transparent 70%);
            top: -200px;
            right: -150px;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(30,110,246,0.1) 0%, transparent 70%);
            bottom: -150px;
            left: -100px;
            pointer-events: none;
        }
        .hero-grid {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content {
            max-width: 600px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,59,59,0.15);
            border: 1px solid rgba(255,59,59,0.3);
            color: #ff8080;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
        }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 900;
            color: var(--white);
            line-height: 1.2;
            letter-spacing: -1px;
            margin-bottom: 20px;
        }
        .hero-desc {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.65);
            margin-bottom: 36px;
            line-height: 1.8;
            max-width: 520px;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }
        .hero-stats {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 32px;
        }
        .hero-stat-item {
            display: flex;
            flex-direction: column;
        }
        .hero-stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--white);
            line-height: 1.2;
        }
        .hero-stat-num span {
            color: var(--accent);
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            margin-top: 4px;
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-card-stack {
            position: relative;
            width: 100%;
            max-width: 460px;
            height: 460px;
        }
        .hero-float-card {
            position: absolute;
            background: rgba(255,255,255,0.06);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            padding: 24px;
            animation: floatCard 6s ease-in-out infinite;
        }
        .hero-float-card:nth-child(1) {
            width: 280px;
            height: 180px;
            top: 10%;
            left: 0;
            animation-delay: 0s;
        }
        .hero-float-card:nth-child(2) {
            width: 240px;
            height: 160px;
            top: 40%;
            right: 0;
            animation-delay: 1.5s;
        }
        .hero-float-card:nth-child(3) {
            width: 200px;
            height: 140px;
            bottom: 5%;
            left: 15%;
            animation-delay: 3s;
        }
        @keyframes floatCard {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-14px); }
        }
        .hero-card-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .hero-card-icon.red { background: rgba(255,59,59,0.2); }
        .hero-card-icon.blue { background: rgba(30,110,246,0.2); }
        .hero-card-icon.gold { background: rgba(255,159,0,0.2); }
        .hero-card-title {
            color: var(--white);
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 6px;
        }
        .hero-card-line {
            height: 8px;
            border-radius: 4px;
            background: rgba(255,255,255,0.08);
            margin-bottom: 8px;
        }
        .hero-card-line.short { width: 60%; }
        .hero-card-line.bar {
            height: 32px;
            border-radius: 8px;
            background: linear-gradient(90deg, rgba(255,59,59,0.4), rgba(255,159,0,0.4));
            margin-top: 12px;
        }
        /* 数据指标卡片 */
        .metrics {
            background: var(--gray-bg);
            padding: 60px 0;
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid rgba(0,0,0,0.04);
        }
        .metric-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .metric-num {
            font-size: 2.6rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .metric-num span {
            font-size: 1.2rem;
        }
        .metric-label {
            font-size: 0.95rem;
            color: var(--gray-text);
            font-weight: 500;
        }
        /* 服务能力卡片 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .service-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px 28px;
            border: 1px solid rgba(0,0,0,0.06);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            cursor: default;
        }
        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(255,59,59,0.2);
        }
        .service-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin-bottom: 20px;
        }
        .service-icon.c-red { background: linear-gradient(135deg, #ff3b3b, #ff6b00); }
        .service-icon.c-blue { background: linear-gradient(135deg, #1e6ef6, #4a90ff); }
        .service-icon.c-gold { background: linear-gradient(135deg, #ff9f00, #ffcc00); }
        .service-icon.c-purple { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
        .service-icon.c-green { background: linear-gradient(135deg, #10b981, #34d399); }
        .service-icon.c-pink { background: linear-gradient(135deg, #ec4899, #f472b6); }
        .service-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .service-card p {
            font-size: 0.92rem;
            color: var(--gray-text);
            line-height: 1.7;
        }
        /* 流程步骤 */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 36px 24px;
            text-align: center;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: var(--white);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--gray-text);
        }
        /* 对比表格 */
        .compare-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius);
            box-shadow: var(--shadow-md);
            background: var(--white);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
            min-width: 780px;
        }
        .compare-table th {
            background: var(--dark);
            color: var(--white);
            padding: 18px 20px;
            text-align: left;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid #eee;
            color: var(--gray-text);
        }
        .compare-table tr:hover td {
            background: #fff5f5;
        }
        .compare-table .highlight {
            background: rgba(255,59,59,0.06);
            font-weight: 600;
            color: var(--dark);
        }
        .rating-stars {
            color: var(--accent);
            font-size: 1.1rem;
            letter-spacing: 2px;
        }
        .compare-score {
            font-size: 2rem;
            font-weight: 900;
            color: var(--primary);
        }
        /* FAQ */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--white);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            border: 1px solid rgba(0,0,0,0.06);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item.active {
            border-color: rgba(255,59,59,0.3);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-arrow {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--gray-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            background: var(--primary);
            color: var(--white);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--gray-text);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        /* 评论卡片 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .review-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px 28px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .review-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .review-stars {
            color: var(--accent);
            font-size: 0.95rem;
            margin-bottom: 16px;
            letter-spacing: 2px;
        }
        .review-text {
            font-size: 0.95rem;
            color: var(--gray-text);
            line-height: 1.8;
            flex: 1;
            margin-bottom: 20px;
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .review-name {
            font-weight: 700;
            font-size: 0.95rem;
        }
        .review-role {
            font-size: 0.8rem;
            color: var(--gray-text);
        }
        /* 案例展示 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .case-card {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: var(--white);
            border: 1px solid rgba(0,0,0,0.06);
            transition: var(--transition);
        }
        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .case-img {
            width: 100%;
            height: 240px;
            object-fit: cover;
            display: block;
        }
        .case-body {
            padding: 24px 28px;
        }
        .case-tag {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--primary);
            background: rgba(255,59,59,0.08);
            padding: 4px 12px;
            border-radius: 50px;
            margin-bottom: 10px;
        }
        .case-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .case-card p {
            font-size: 0.9rem;
            color: var(--gray-text);
        }
        /* 文章列表 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .article-card {
            background: var(--white);
            border-radius: var(--radius-sm);
            padding: 28px 24px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(255,59,59,0.15);
        }
        .article-date {
            font-size: 0.8rem;
            color: var(--gray-text);
            margin-bottom: 10px;
        }
        .article-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.5;
        }
        .article-card p {
            font-size: 0.88rem;
            color: var(--gray-text);
            line-height: 1.7;
        }
        .article-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            margin-top: 14px;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .article-link:hover {
            gap: 8px;
        }
        /* 表单 */
        .form-section {
            background: var(--dark);
            color: var(--white);
            border-radius: var(--radius);
            padding: 60px 48px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: start;
        }
        .form-section .section-title {
            color: var(--white);
        }
        .form-section .section-subtitle {
            color: rgba(255,255,255,0.6);
            margin-bottom: 32px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            font-size: 0.88rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: rgba(255,255,255,0.85);
        }
        .form-control {
            width: 100%;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255,255,255,0.15);
            background: rgba(255,255,255,0.06);
            color: var(--white);
            font-size: 0.95rem;
            font-family: var(--font);
            transition: var(--transition);
            outline: none;
        }
        .form-control::placeholder {
            color: rgba(255,255,255,0.35);
        }
        .form-control:focus {
            border-color: var(--primary);
            background: rgba(255,255,255,0.1);
            box-shadow: 0 0 0 3px rgba(255,59,59,0.2);
        }
        select.form-control {
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='rgba(255,255,255,0.5)' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 18px center;
            padding-right: 44px;
        }
        select.form-control option {
            background: var(--dark-2);
            color: var(--white);
        }
        textarea.form-control {
            resize: vertical;
            min-height: 120px;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .form-left {
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .form-contact-list {
            margin-top: 32px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .form-contact-item {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.92rem;
            color: rgba(255,255,255,0.75);
        }
        .form-contact-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(255,59,59,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        /* 页脚 */
        .footer {
            background: var(--dark);
            color: rgba(255,255,255,0.6);
            padding: 60px 0 0;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.8;
            margin: 16px 0;
        }
        .footer h5 {
            color: var(--white);
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.55);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--white);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.85rem;
        }
        .footer-qrcode {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .footer-qrcode img {
            width: 80px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
        }
        .footer-qrcode span {
            font-size: 0.8rem;
        }
        /* 浮动客服 */
        .float-customer {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .float-btn {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--white);
            box-shadow: var(--shadow-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            position: relative;
        }
        .float-btn:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0,0,0,0.2);
        }
        .float-btn svg {
            width: 26px;
            height: 26px;
        }
        .float-btn.wechat {
            background: #07c160;
        }
        .float-btn.wechat svg { fill: var(--white); }
        .float-btn.qq {
            background: #12b7f5;
        }
        .float-btn.qq svg { fill: var(--white); }
        .float-btn.top-btn {
            background: var(--dark);
        }
        .float-btn.top-btn svg { fill: var(--white); }
        .float-qr-pop {
            display: none;
            position: absolute;
            right: 68px;
            bottom: 0;
            background: var(--white);
            border-radius: 14px;
            padding: 16px;
            box-shadow: var(--shadow-lg);
            width: 180px;
            text-align: center;
        }
        .float-btn.wechat:hover .float-qr-pop,
        .float-qr-pop.show {
            display: block;
        }
        .float-qr-pop img {
            width: 100%;
            border-radius: 8px;
            margin-bottom: 8px;
        }
        .float-qr-pop p {
            font-size: 0.8rem;
            color: var(--gray-text);
        }
        /* 标签云 & 辅助组件 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 16px;
        }
        .tag-item {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 50px;
            background: var(--white);
            border: 1px solid rgba(0,0,0,0.08);
            font-size: 0.82rem;
            color: var(--gray-text);
            transition: var(--transition);
            cursor: default;
        }
        .tag-item:hover {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .price-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .price-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 36px 28px;
            border: 1px solid rgba(0,0,0,0.06);
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: var(--transition);
        }
        .price-card.featured {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255,59,59,0.12), var(--shadow-md);
            position: relative;
        }
        .price-card.featured::before {
            content: '推荐';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: var(--white);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: 50px;
            white-space: nowrap;
        }
        .price-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .price-name {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .price-amount {
            font-size: 2.4rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 4px;
        }
        .price-amount span {
            font-size: 0.95rem;
            color: var(--gray-text);
            font-weight: 500;
        }
        .price-desc {
            font-size: 0.85rem;
            color: var(--gray-text);
            margin-bottom: 24px;
        }
        .price-features {
            text-align: left;
            margin-bottom: 24px;
        }
        .price-features li {
            font-size: 0.88rem;
            color: var(--gray-text);
            padding: 6px 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .price-features li::before {
            content: '✓';
            color: var(--primary);
            font-weight: 700;
        }
        .timeline {
            position: relative;
            padding-left: 32px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--primary), var(--accent));
            border-radius: 1px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 28px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -32px;
            top: 6px;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--white);
            border: 3px solid var(--primary);
        }
        .timeline-item h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .timeline-item p {
            font-size: 0.9rem;
            color: var(--gray-text);
        }
        .network-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .network-item {
            background: var(--white);
            border-radius: var(--radius-sm);
            padding: 20px;
            text-align: center;
            border: 1px solid rgba(0,0,0,0.06);
            transition: var(--transition);
            font-size: 0.95rem;
            font-weight: 600;
        }
        .network-item:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-3px);
        }
        /* 动画 */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }
        /* 响应式 */
        @media (max-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr; gap: 40px; }
            .hero-visual { display: none; }
            .hero h1 { font-size: 2.6rem; }
            .metric-grid { grid-template-columns: repeat(2, 1fr); }
            .metrics-grid { grid-template-columns: repeat(2, 1fr); }
            .services-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .reviews-grid { grid-template-columns: repeat(2, 1fr); }
            .articles-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .form-section { grid-template-columns: 1fr; padding: 40px 28px; }
            .network-grid { grid-template-columns: repeat(2, 1fr); }
            .price-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: var(--dark);
                flex-direction: column;
                padding: 16px;
                gap: 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav-links.open { display: flex; }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                border-radius: 8px;
            }
            .nav-toggle { display: flex; }
            .nav-actions .btn { display: none; }
            .section { padding: 56px 0; }
            .section-title { font-size: 1.7rem; }
            .hero { padding: 130px 0 70px; min-height: auto; }
            .hero h1 { font-size: 2rem; }
            .hero-desc { font-size: 1rem; }
            .hero-stats { gap: 20px; }
            .hero-stat-num { font-size: 1.4rem; }
            .metrics-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .metric-num { font-size: 2rem; }
            .services-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .reviews-grid { grid-template-columns: 1fr; }
            .cases-grid { grid-template-columns: 1fr; }
            .articles-grid { grid-template-columns: 1fr; }
            .form-row { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .network-grid { grid-template-columns: 1fr 1fr; }
            .float-customer { right: 16px; bottom: 16px; }
            .float-btn { width: 48px; height: 48px; }
            .hero-cta { flex-direction: column; }
            .hero-cta .btn { width: 100%; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.7rem; }
            .section-title { font-size: 1.5rem; }
            .metrics-grid { grid-template-columns: 1fr; }
            .network-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        /* 辅助类 */
        .text-center { text-align: center; }
        .mx-auto { margin-left: auto; margin-right: auto; }
        .mb-0 { margin-bottom: 0; }
        .mt-48 { margin-top: 48px; }
        .bg-gray { background: var(--gray-bg); }
        .bg-white { background: var(--white); }
        .divider { height: 1px; background: rgba(0,0,0,0.06); margin: 48px 0; }
        .ai-page-image { border-radius: var(--radius); }
        /* 首页链接隐藏样式（如需隐藏可启用下面注释，当前不隐藏） */
        /* .ai-page-home-link { display: none; } */