:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --secondary: #06b6d4;
      --accent-pink: #ec4899;
      --accent-orange: #f97316;
      --accent-yellow: #eab308;
      --accent-green: #10b981;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --rainbow-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 25%, #10b981 50%, #f59e0b 75%, #ec4899 100%);
      --soft-rainbow: linear-gradient(135deg, rgba(79,70,229,0.06) 0%, rgba(6,182,212,0.06) 25%, rgba(16,185,129,0.06) 50%, rgba(245,158,11,0.06) 75%, rgba(236,72,153,0.06) 100%);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 14px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
      --radius: 12px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
    }

    body {
      line-height: 1.6;
      background: var(--bg-page);
      overflow-x: hidden;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    .section-head {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 9999px;
      background: #eff6ff;
      color: var(--primary);
      margin-bottom: 12px;
      border: 1px solid rgba(79,70,229,0.2);
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

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

    /* Header & Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-area .logo-box {
      max-width: 140px;
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: #f1f5f9;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-gradient {
      background: var(--rainbow-gradient);
      color: #fff !important;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }

    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(236,72,153,0.06) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(6,182,212,0.08) 0%, transparent 40%),
                  var(--bg-page);
      padding: 90px 0 70px 0;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn-primary-large {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #fff !important;
      background: var(--rainbow-gradient);
      border-radius: 10px;
      border: none;
      box-shadow: 0 8px 24px rgba(79, 70, 229, 0.35);
      transition: all 0.25s;
    }

    .btn-primary-large:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(79, 70, 229, 0.45);
    }

    .btn-outline-large {
      padding: 13px 30px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 10px;
      transition: all 0.25s;
    }

    .btn-outline-large:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: #c7d2fe;
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      font-family: Arial, sans-serif;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 & 多模型展示 */
    .bg-soft {
      background: #ffffff;
    }

    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #f1f5f9;
      color: #334155;
      font-size: 13px;
      font-weight: 600;
      padding: 8px 16px;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: #e0e7ff;
      color: var(--primary);
      border-color: #c7d2fe;
      transform: translateY(-2px);
    }

    /* 网格卡片通用 */
    .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;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      border-radius: var(--radius) var(--radius) 0 0;
      background: var(--rainbow-gradient);
      opacity: 0;
      transition: opacity 0.25s ease;
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.2s;
    }

    .step-box:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .step-badge {
      width: 40px;
      height: 40px;
      background: var(--rainbow-gradient);
      color: #fff;
      font-weight: 700;
      font-size: 16px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
    }

    .step-box h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 对比评测表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      color: #ffffff;
      padding: 30px;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .review-left h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .review-left p {
      font-size: 14px;
      opacity: 0.9;
    }

    .review-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-badge-large {
      font-size: 38px;
      font-weight: 900;
      background: rgba(255, 255, 255, 0.2);
      padding: 4px 20px;
      border-radius: 12px;
      line-height: 1.2;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .compare-highlight {
      background: rgba(79, 70, 229, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例媒体画廊 */
    .gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      align-items: stretch;
    }

    .gallery-img-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
    }

    .gallery-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .gallery-img-box:hover img {
      transform: scale(1.02);
    }

    .gallery-sub-grid {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    /* 资讯展示 */
    .article-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      list-style: none;
      margin-top: 16px;
    }

    .article-links-list a {
      color: var(--primary);
      font-weight: 500;
      text-decoration: underline;
      font-size: 14px;
    }

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

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--rainbow-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .user-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .testimonial-card p {
      font-size: 14px;
      color: #475569;
      line-height: 1.6;
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-icon {
      font-size: 20px;
      font-weight: 400;
      transition: transform 0.2s ease;
      color: var(--primary);
    }

    .faq-answer {
      padding: 0 24px 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与需求匹配 */
    .form-section-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .contact-info-panel p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-meta-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 14px;
    }

    .contact-meta-item strong {
      color: var(--text-main);
      min-width: 80px;
    }

    .qr-card {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 12px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #f8fafc;
    }

    .qr-card img {
      width: 130px;
      height: 130px;
      display: block;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* 友情链接与页脚 */
    .links-bar {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 24px 0;
      font-size: 13px;
    }

    .links-flex {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
    }

    .links-flex strong {
      color: var(--text-main);
    }

    .links-flex a {
      color: var(--text-muted);
    }

    .links-flex a:hover {
      color: var(--primary);
    }

    .site-footer {
      background: #111827;
      color: #9ca3af;
      padding: 50px 0 30px 0;
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col ul a {
      color: #9ca3af;
    }

    .footer-col ul a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #6b7280;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      position: relative;
      transition: transform 0.2s;
    }

    .floating-btn:hover {
      transform: scale(1.08);
    }

    .qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }

    .qr-popup img {
      width: 100%;
      display: block;
      border-radius: 4px;
    }

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

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .cards-grid-3, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .gallery-grid {
        grid-template-columns: 1fr;
      }
      .form-section-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .hero-title {
        font-size: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }