:root {
      --primary-color: #4f46e5;
      --primary-vivid: #6366f1;
      --accent-magenta: #f43f5e;
      --accent-cyan: #06b6d4;
      --accent-gold: #f59e0b;
      --accent-green: #10b981;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 8px 24px rgba(79, 70, 229, 0.12);
      --shadow-hover: 0 14px 32px rgba(79, 70, 229, 0.18);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: var(--transition);
    }

    a:hover {
      color: var(--accent-magenta);
    }

    .section {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.1));
      color: var(--primary-color);
      font-weight: 700;
      font-size: 0.88rem;
      border-radius: 50px;
      margin-bottom: 12px;
      border: 1px solid rgba(79, 70, 229, 0.2);
    }

    .section-title {
      font-size: 2.2rem;
      color: var(--text-main);
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    .section-desc {
      color: var(--text-muted);
      max-width: 680px;
      margin: 10px auto 0;
      font-size: 1.05rem;
    }

    /* 头部与导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--primary-color);
      box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      gap: 0; /* 严格要求：.nav-links的gap属性设置为0 */
      display: flex;
      align-items: center;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      margin: 0 2px;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      border-radius: 6px;
    }

    .nav-links li a:hover {
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary-color);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--primary-vivid));
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      background: linear-gradient(135deg, var(--primary-vivid), var(--accent-magenta));
    }

    .btn-accent {
      background: var(--accent-magenta);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(244, 63, 94, 0.35);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      background: #e11d48;
    }

    .btn-outline {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-color);
      color: #ffffff !important;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 5px;
    }

    .menu-toggle span {
      width: 25px;
      height: 3px;
      background-color: var(--text-main);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 首屏 HERO 区域 - 严禁出现图片 */
    .hero-section {
      padding: 85px 0 75px;
      background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.05) 50%, rgba(244, 63, 94, 0.03) 100%), #ffffff;
      border-bottom: 2px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #0f172a;
      color: #06b6d4;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 24px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    .hero-title-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title-h1 span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-magenta));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.7;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: var(--bg-light);
      padding: 22px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      border-top: 4px solid var(--primary-color);
    }

    .stat-card:nth-child(2) { border-top-color: var(--accent-cyan); }
    .stat-card:nth-child(3) { border-top-color: var(--accent-magenta); }
    .stat-card:nth-child(4) { border-top-color: var(--accent-gold); }

    .stat-num {
      font-size: 2.1rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 关于我们与平台介绍 */
    .grid-2col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .content-box h3 {
      font-size: 1.8rem;
      margin-bottom: 18px;
      color: var(--text-main);
    }

    .content-box p {
      color: var(--text-muted);
      margin-bottom: 16px;
      font-size: 1.02rem;
    }

    .feature-check-list {
      list-style: none;
      margin-top: 20px;
    }

    .feature-check-list li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 12px;
      font-weight: 600;
      color: var(--text-main);
    }

    .feature-check-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--accent-green);
      font-weight: 900;
      font-size: 1.1rem;
    }

    .img-wrapper {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 3px solid #ffffff;
    }

    .img-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .img-wrapper:hover img {
      transform: scale(1.03);
    }

    /* 卡片网格组件 */
    .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: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .card-item:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-color);
    }

    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
      color: var(--primary-color);
      font-weight: 900;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      flex-grow: 1;
    }

    /* 智能模型支撑墙 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 25px;
    }

    .model-badge {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.03);
      transition: var(--transition);
    }

    .model-badge:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 对比评测表格 */
    .rating-header {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #ffffff;
      padding: 30px;
      border-radius: var(--radius) var(--radius) 0 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-number {
      font-size: 3rem;
      font-weight: 900;
      color: var(--accent-gold);
      line-height: 1;
    }

    .stars {
      color: var(--accent-gold);
      font-size: 1.4rem;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 0 0 var(--radius) var(--radius);
      box-shadow: var(--shadow-md);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comp-table th, .comp-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .comp-table th {
      background: #f1f5f9;
      font-weight: 800;
      color: var(--text-main);
    }

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

    .highlight-cell {
      background: rgba(79, 70, 229, 0.04);
      font-weight: 700;
      color: var(--primary-color);
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      padding: 24px 18px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      font-weight: 900;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 15px;
      font-size: 1.1rem;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

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

    .review-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: flex-column;
      justify-content: space-between;
    }

    .review-content {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      font-style: italic;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-cyan));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .user-info h5 {
      font-size: 1rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .user-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      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;
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 800;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.5rem;
      color: var(--primary-color);
      transition: var(--transition);
    }

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

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

    .faq-answer-inner {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.98rem;
    }

    /* 表单与联系区域 */
    .contact-wrapper {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .contact-info-side {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #ffffff;
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-side h3 {
      font-size: 1.8rem;
      margin-bottom: 15px;
    }

    .info-list-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
      font-size: 1rem;
    }

    .qr-container {
      margin-top: 20px;
      text-align: center;
      background: rgba(255,255,255,0.08);
      padding: 20px;
      border-radius: 10px;
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      border: 2px solid #ffffff;
    }

    .contact-form-side {
      padding: 40px;
    }

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

    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 1rem;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 行业资讯与短代码文章 */
    .articles-block {
      background: var(--bg-light);
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      margin-top: 20px;
    }

    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .article-link-tag {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 600;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary-color);
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.4rem;
      margin-bottom: 15px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
    }

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

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

    .footer-col ul li a {
      color: #94a3b8;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      margin-top: 25px;
    }

    .friend-links-box h6 {
      color: #ffffff;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
    }

    .friend-links-list a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .friend-links-list a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      text-align: center;
      font-size: 0.88rem;
    }

    /* 浮动客服与置顶按钮 */
    .floating-widget {
      position: fixed;
      right: 25px;
      bottom: 35px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0,0,0,0.25);
      cursor: pointer;
      font-weight: 900;
      border: none;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--accent-magenta);
    }

    /* 响应式样式 */
    @media (max-width: 992px) {
      .cards-grid-4, .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid, .cards-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2col, .contact-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 2px solid var(--primary-color);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .hero-title-h1 {
        font-size: 1.9rem;
      }
      .reviews-grid, .cards-grid-3, .cards-grid-4, .hero-stats, .steps-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
        width: 100%;
      }
      .hero-actions .btn {
        width: 100%;
      }
    }