:root {
      --primary: #5c3ffb;
      --rainbow-1: #ff4b72;
      --rainbow-2: #ff8f3d;
      --rainbow-3: #ffc837;
      --rainbow-4: #1dd1a1;
      --rainbow-5: #0abde3;
      --rainbow-6: #5f27cd;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #fafbfc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(30, 41, 59, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(30, 41, 59, 0.08);
      --shadow-rainbow: 0 12px 32px -8px rgba(92, 63, 251, 0.22);
      --rainbow-gradient: linear-gradient(135deg, #ff4b72, #ff8f3d 20%, #ffc837 40%, #1dd1a1 60%, #0abde3 80%, #6c5ce7 100%);
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      background-image: radial-gradient(circle at 10% 10%, rgba(255, 75, 114, 0.03) 0%, transparent 40%),
                        radial-gradient(circle at 90% 20%, rgba(10, 189, 227, 0.04) 0%, transparent 50%),
                        radial-gradient(circle at 50% 80%, rgba(95, 39, 205, 0.03) 0%, transparent 60%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    ul, ol {
      list-style: none;
    }

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

    /* 顶部彩虹光条 */
    .top-rainbow-line {
      height: 4px;
      width: 100%;
      background: var(--rainbow-gradient);
    }

    /* 顶部导航 */
    header {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: box-shadow 0.3s ease;
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.25rem;
      color: #0f172a;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: #334155;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: rgba(92, 63, 251, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-portal {
      padding: 8px 18px;
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 999px;
      background: var(--rainbow-gradient);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(255, 75, 114, 0.25);
    }
    .btn-nav-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(255, 75, 114, 0.35);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.2rem;
    }

    /* 区域通则 */
    section {
      padding: 72px 0;
      position: relative;
    }
    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px auto;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      border-radius: 999px;
      font-size: 0.8rem;
      font-weight: 600;
      background: linear-gradient(90deg, rgba(255, 75, 114, 0.1), rgba(95, 39, 205, 0.1));
      color: var(--primary);
      border: 1px solid rgba(95, 39, 205, 0.15);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* HERO 首屏（无图片设计） */
    .hero-section {
      padding: 96px 0 80px 0;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(248, 250, 252, 0.95) 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-pill {
      display: inline-block;
      padding: 6px 18px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid rgba(255, 143, 61, 0.3);
      box-shadow: 0 4px 14px rgba(255, 143, 61, 0.1);
      font-size: 0.85rem;
      font-weight: 600;
      color: #ea580c;
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-lead {
      font-size: 1.15rem;
      color: #475569;
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main-rainbow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 34px;
      border-radius: 999px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      background: var(--rainbow-gradient);
      box-shadow: var(--shadow-rainbow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .btn-main-rainbow:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 16px 36px -6px rgba(92, 63, 251, 0.35);
    }
    .btn-secondary {
      padding: 14px 28px;
      border-radius: 999px;
      font-size: 1rem;
      font-weight: 600;
      color: #334155;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      background: #f8fafc;
      border-color: #cbd5e1;
    }
    /* 首屏数据指示卡片（无图片，几何与CSS高质感） */
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid #f1f5f9;
      border-top: 4px solid var(--rainbow-5);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      text-align: left;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }
    .metric-card:nth-child(1) { border-top-color: var(--rainbow-1); }
    .metric-card:nth-child(2) { border-top-color: var(--rainbow-2); }
    .metric-card:nth-child(3) { border-top-color: var(--rainbow-4); }
    .metric-card:nth-child(4) { border-top-color: var(--rainbow-6); }
    .metric-card:hover { transform: translateY(-4px); }
    .metric-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.1;
    }
    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 多模型生态徽章区 */
    .models-bar-section {
      padding: 24px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }
    .models-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-tag {
      font-size: 0.82rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 999px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      color: #475569;
      transition: all 0.2s;
    }
    .model-tag:hover {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 4px 10px rgba(92, 63, 251, 0.1);
    }

    /* 卡片网格通则 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
    }
    .card-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(92, 63, 251, 0.25);
    }
    .card-icon-pill {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
      background: linear-gradient(135deg, rgba(92, 63, 251, 0.1), rgba(10, 189, 227, 0.1));
      color: var(--primary);
    }
    .card-h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.9rem;
      color: #64748b;
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台介绍 & 流程 */
    .feature-list-check {
      margin-top: 14px;
    }
    .feature-list-check li {
      position: relative;
      padding-left: 20px;
      font-size: 0.85rem;
      color: #475569;
      margin-bottom: 6px;
    }
    .feature-list-check li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--rainbow-4);
      font-weight: bold;
    }

    /* 流程时间线 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .step-seq {
      width: 36px;
      height: 36px;
      margin: 0 auto 12px auto;
      border-radius: 50%;
      background: var(--rainbow-gradient);
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .step-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-text {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 案例展示区（含图片） */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }
    .case-body {
      padding: 20px;
    }
    .case-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 4px;
      background: #eef2ff;
      color: var(--primary);
      margin-bottom: 8px;
    }

    /* 对比评测高光 */
    .rating-box {
      background: linear-gradient(135deg, rgba(255, 245, 245, 0.8), rgba(240, 249, 255, 0.8));
      border: 1px solid #fed7aa;
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .score-big {
      font-size: 3.4rem;
      font-weight: 900;
      color: #ea580c;
      line-height: 1;
    }
    .score-info h4 {
      font-size: 1.2rem;
      color: #0f172a;
    }
    .stars {
      color: #f59e0b;
      font-size: 1.25rem;
      letter-spacing: 2px;
    }
    .compare-table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }
    .compare-table tr:hover td {
      background: #fdfdfd;
    }
    .highlight-col {
      background: rgba(92, 63, 251, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .status-badge {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.8rem;
    }
    .badge-win { background: #dcfce7; color: #166534; }
    .badge-mid { background: #fef3c7; color: #92400e; }

    /* 用户评论卡片 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.65;
      margin-bottom: 18px;
      position: relative;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #e2e8f0;
      padding-top: 14px;
    }
    .user-avatar-initial {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--rainbow-gradient);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }
    .user-info h5 {
      font-size: 0.95rem;
      color: #0f172a;
    }
    .user-info p {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 22px;
      font-weight: 600;
      font-size: 1rem;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.1rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      padding: 0 22px;
      font-size: 0.92rem;
      color: #475569;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
      padding: 0 22px 18px 22px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与联系区 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .contact-info-panel {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .contact-item-row {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .contact-icon-box {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: #eef2ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      flex-shrink: 0;
    }
    .contact-qr-wrap {
      margin-top: 10px;
      padding: 16px;
      border-radius: var(--radius-md);
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      display: inline-block;
      max-width: 190px;
      text-align: center;
    }
    .contact-qr-wrap img {
      width: 100%;
      height: auto;
      border-radius: 6px;
      display: block;
    }
    .contact-qr-label {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 表单样式 */
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: #0f172a;
      outline: none;
      transition: border-color 0.2s, background 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(92, 63, 251, 0.12);
    }
    .btn-submit-form {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      background: var(--rainbow-gradient);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(92, 63, 251, 0.25);
      transition: opacity 0.25s;
    }
    .btn-submit-form:hover {
      opacity: 0.95;
    }

    /* 行业资讯文章区 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-title {
      font-size: 1rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .article-link-btn {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 友情链接与页脚 */
    .friendly-links-section {
      padding: 32px 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
    }
    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }
    .friendly-links-wrap a {
      font-size: 0.85rem;
      color: #64748b;
      padding: 4px 10px;
      border-radius: 4px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
    }
    .friendly-links-wrap a:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 32px 0;
      font-size: 0.88rem;
    }
    .footer-inner {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }
    .footer-desc {
      margin-top: 14px;
      font-size: 0.85rem;
      line-height: 1.6;
      color: #64748b;
      max-width: 380px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 0.95rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a {
      color: #94a3b8;
    }
    .footer-links-list a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      color: #64748b;
      font-size: 0.82rem;
    }

    /* 浮动客服挂件 */
    .float-service-panel {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 1.2rem;
      border: 1px solid var(--border-color);
      transition: all 0.25s ease;
      position: relative;
    }
    .float-btn:hover {
      transform: scale(1.08);
      background: var(--rainbow-gradient);
      color: #ffffff;
    }
    .float-qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      width: 160px;
      padding: 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-md);
      text-align: center;
    }
    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
    }
    .float-qr-pop span {
      display: block;
      font-size: 0.75rem;
      color: #334155;
      margin-top: 6px;
    }
    .float-btn:hover .float-qr-pop {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3, .cards-grid-4, .case-grid, .articles-grid { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(3, 1fr); }
      .contact-container { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr 1fr; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active a {
        padding: 12px 16px;
        width: 100%;
      }
    }
    @media (max-width: 640px) {
      .hero-h1 { font-size: 1.85rem; }
      .hero-metrics-grid, .cards-grid-3, .cards-grid-4, .case-grid, .articles-grid, .step-grid { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr; }
      .rating-box { flex-direction: column; align-items: flex-start; }
      .section-title { font-size: 1.6rem; }
    }