:root {
      --primary: #0284c7;
      --primary-light: #38bdf8;
      --primary-dark: #0369a1;
      --accent: #f59e0b;
      --accent-neon: #06b6d4;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border: #e2e8f0;
      --border-focus: #0ea5e9;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 12px 24px -4px rgba(2, 132, 199, 0.08), 0 8px 16px -4px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 35px -6px rgba(2, 132, 199, 0.12), 0 10px 15px -3px rgba(0, 0, 0, 0.05);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: rgba(2, 132, 199, 0.08);
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      transition: var(--transition);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .nav-brand .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 10px 14px;
      display: inline-block;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: rgba(2, 132, 199, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff !important;
      padding: 9px 20px;
      border-radius: 999px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(2, 132, 199, 0.4);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle svg {
      width: 24px;
      height: 24px;
      stroke: var(--text-main);
    }

    /* 首屏 HERO（纯CSS，无图片） */
    .hero-section {
      background: linear-gradient(180deg, #f0f9ff 0%, #e0f2fe 50%, #f8fafc 100%);
      padding: 90px 0 80px 0;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }
    .hero-glow-1 {
      position: absolute;
      top: -10%;
      left: 15%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(56, 189, 248, 0.25) 0%, rgba(255, 255, 255, 0) 70%);
      border-radius: 50%;
      filter: blur(40px);
      pointer-events: none;
    }
    .hero-glow-2 {
      position: absolute;
      bottom: 5%;
      right: 10%;
      width: 380px;
      height: 380px;
      background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
      border-radius: 50%;
      filter: blur(50px);
      pointer-events: none;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid rgba(2, 132, 199, 0.2);
      padding: 8px 18px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-badge span.pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10b981;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -1px;
      line-height: 1.25;
      margin-bottom: 22px;
    }
    .hero-highlight {
      background: linear-gradient(120deg, #0284c7 0%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-hero-primary {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      font-size: 17px;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: 999px;
      box-shadow: 0 10px 25px rgba(2, 132, 199, 0.35);
      border: 2px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-primary:hover {
      background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(2, 132, 199, 0.45);
    }
    .btn-hero-secondary {
      background: #ffffff;
      color: var(--text-main);
      font-size: 17px;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 999px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-secondary:hover {
      background: #f8fafc;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 980px;
      margin: 0 auto;
    }
    .hero-metric-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid var(--border);
      backdrop-filter: blur(8px);
      padding: 22px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .metric-value {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      display: block;
    }
    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵标签云 */
    .model-pills-wrap {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      margin-top: 40px;
      text-align: center;
    }
    .model-pills-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-tag {
      background: #f1f5f9;
      color: #334155;
      font-size: 12px;
      font-weight: 600;
      padding: 5px 12px;
      border-radius: 999px;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }
    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 卡片网格通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }
    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .card-footer-pill {
      display: inline-block;
      margin-top: 14px;
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
    }

    /* 平台介绍图文板块 */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .media-frame {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      background: #f1f5f9;
    }
    .media-frame img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 评测与对比模块 */
    .review-score-hero {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .score-big {
      font-size: 56px;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }
    .score-stars {
      color: #fbbf24;
      font-size: 24px;
      letter-spacing: 2px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
      min-width: 650px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
    }
    .eval-table th {
      background-color: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .eval-table tr:last-child td {
      border-bottom: none;
    }
    .eval-table tr:hover td {
      background-color: #f0f9ff;
    }
    .col-highlight {
      background: #f0fdf4;
      color: #166534;
      font-weight: 700;
    }

    /* 流程时间线 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 15px;
    }

    /* 客户评价 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-role {
      font-size: 12px;
      color: #64748b;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-header {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-header:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 20px;
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
    }
    .faq-content {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-body {
      max-height: 240px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 文章列表 & 资源 */
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .article-link {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 表单与联系 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background-color: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--border-focus);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .btn-submit {
      width: 100%;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      border: none;
      padding: 14px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.25);
      transition: var(--transition);
    }
    .btn-submit:hover {
      box-shadow: 0 8px 20px rgba(2, 132, 199, 0.4);
      transform: translateY(-1px);
    }
    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .contact-qr-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 24px;
      padding: 20px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
    }
    .contact-qr-img {
      width: 110px;
      height: 110px;
      object-fit: contain;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
      border: 1px solid var(--border);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }
    .footer-links-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col-title {
      font-size: 15px;
      font-weight: 700;
      color: #f8fafc;
      margin-bottom: 18px;
    }
    .footer-nav {
      list-style: none;
    }
    .footer-nav li {
      margin-bottom: 10px;
    }
    .footer-nav li a {
      font-size: 13px;
      color: #94a3b8;
    }
    .footer-nav li a:hover {
      color: #38bdf8;
    }
    .friend-links-wrap {
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
    }
    .friend-links-label {
      font-weight: 700;
      color: #f8fafc;
    }
    .friend-links-wrap a {
      color: #94a3b8;
    }
    .friend-links-wrap a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动工具栏 */
    .floating-toolbar {
      position: fixed;
      bottom: 30px;
      right: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: var(--transition);
      position: relative;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .float-qr-pop {
      display: none;
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
      width: 150px;
      text-align: center;
    }
    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
    }
    .float-btn:hover .float-qr-pop {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-links-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        display: none;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      .grid-3, .grid-2, .contact-layout, .step-list {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .section-title {
        font-size: 24px;
      }
      .footer-links-grid {
        grid-template-columns: 1fr;
      }
    }