:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --primary-accent: #06b6d4;
      --contrast-pop: #ff0055;
      --contrast-yellow: #f59e0b;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --border-vibrant: #4338ca;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(67, 56, 202, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-pop: 5px 5px 0px #0f172a;
      --radius: 12px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(#cbd5e1 0.75px, transparent 0.75px);
      background-size: 24px 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }

    ul, ol {
      list-style: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--text-main);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-area .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.3rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      background: var(--contrast-pop);
      color: #fff;
      font-size: 0.7rem;
      padding: 2px 6px;
      border-radius: 4px;
      font-weight: 700;
      text-transform: uppercase;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    /* 核心样式要求：.nav-links gap 必须为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: #eff6ff;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 800;
      border-radius: 8px;
      cursor: pointer;
      transition: transform 0.15s ease, box-shadow 0.15s ease;
      border: 2px solid var(--text-main);
      text-align: center;
      white-space: nowrap;
    }

    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-pop);
    }

    .btn:active {
      transform: translate(0, 0);
      box-shadow: none;
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--text-main);
    }

    .btn-pop {
      background: var(--contrast-pop);
      color: #ffffff;
    }

    .btn-yellow {
      background: var(--contrast-yellow);
      color: var(--text-main);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: 2px solid var(--text-main);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.2rem;
      font-weight: bold;
    }

    /* 首屏 Hero 严格无任何图片 */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
      border-bottom: 2px solid var(--text-main);
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #fef08a;
      border: 2px solid var(--text-main);
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 800;
      margin-bottom: 24px;
      box-shadow: 3px 3px 0px var(--text-main);
    }

    .hero-title {
      font-size: clamp(2rem, 4vw, 3.2rem);
      line-height: 1.2;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-highlight {
      background: linear-gradient(120deg, #ec4899 0%, #8b5cf6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 34px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .hero-stat-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 20px 16px;
      text-align: center;
      box-shadow: 4px 4px 0px var(--text-main);
      transition: transform 0.2s ease;
    }

    .hero-stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 6px;
      color: var(--primary);
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 模块通用样式 */
    .section {
      padding: 80px 0;
      border-bottom: 2px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      background: #c7d2fe;
      color: var(--primary);
      border: 2px solid var(--text-main);
      border-radius: 20px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .card {
      background: var(--bg-card);
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      transition: all 0.2s ease;
      position: relative;
    }

    .card:hover {
      transform: translate(-3px, -3px);
      box-shadow: 7px 7px 0px var(--text-main);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background: #e0e7ff;
      border: 2px solid var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
      box-shadow: 2px 2px 0px var(--text-main);
    }

    .card-title {
      font-size: 1.3rem;
      font-weight: 900;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      background: var(--bg-alt);
      border: 1px solid var(--text-main);
      border-radius: 4px;
      color: var(--text-main);
    }

    /* 平台矩阵标签云 */
    .platform-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .p-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 800;
      box-shadow: 2px 2px 0px var(--text-main);
      transition: transform 0.15s;
    }

    .p-tag:hover {
      background: var(--contrast-yellow);
      transform: rotate(-2deg) scale(1.05);
    }

    /* 对比评测高光区 */
    .review-highlight-box {
      background: #fff;
      border: 3px solid var(--text-main);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: 6px 6px 0px var(--contrast-pop);
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .review-score-area {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-badge {
      background: var(--contrast-pop);
      color: #fff;
      border: 2px solid var(--text-main);
      padding: 16px 24px;
      border-radius: 12px;
      text-align: center;
      box-shadow: 3px 3px 0px var(--text-main);
    }

    .score-val {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-max {
      font-size: 0.9rem;
      font-weight: 700;
      opacity: 0.9;
    }

    .stars-display {
      font-size: 1.5rem;
      color: #f59e0b;
      letter-spacing: 4px;
      margin-bottom: 6px;
    }

    .review-meta h3 {
      font-size: 1.4rem;
      font-weight: 900;
    }

    .review-meta p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* 表格响应式容器 */
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 5px 5px 0px var(--text-main);
      background: #fff;
    }

    .table-custom {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .table-custom th, .table-custom td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .table-custom th {
      background: #eff6ff;
      color: var(--text-main);
      font-weight: 900;
      border-bottom: 2px solid var(--text-main);
    }

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

    .table-custom tr:hover td {
      background: #fafafa;
    }

    .table-pill {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 800;
      border: 1px solid var(--text-main);
    }

    .pill-green {
      background: #bbf7d0;
      color: #14532d;
    }

    .pill-red {
      background: #fecaca;
      color: #7f1d1d;
    }

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

    .process-card {
      background: #fff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 24px 20px;
      position: relative;
      box-shadow: 4px 4px 0px var(--text-main);
    }

    .step-badge {
      position: absolute;
      top: -14px;
      left: 20px;
      background: var(--contrast-yellow);
      color: var(--text-main);
      font-size: 0.8rem;
      font-weight: 900;
      padding: 2px 10px;
      border-radius: 4px;
      border: 2px solid var(--text-main);
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 900;
      margin-top: 8px;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 案例展示区 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-item {
      background: #fff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: 4px 4px 0px var(--text-main);
      transition: transform 0.2s ease;
    }

    .case-item:hover {
      transform: translateY(-4px);
    }

    .case-thumb {
      width: 100%;
      height: 220px;
      background: #e2e8f0;
      overflow: hidden;
      border-bottom: 2px solid var(--text-main);
      position: relative;
    }

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

    .case-item:hover .case-thumb img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.75rem;
      font-weight: 800;
      color: var(--primary);
      background: #e0e7ff;
      border: 1px solid var(--primary);
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .case-name {
      font-size: 1.15rem;
      font-weight: 900;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

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

    .review-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #c7d2fe;
      border: 2px solid var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
      color: var(--text-main);
    }

    .user-meta-name {
      font-size: 1rem;
      font-weight: 800;
    }

    .user-meta-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 14px;
      font-style: normal;
    }

    .review-rating {
      color: #f59e0b;
      font-size: 0.85rem;
    }

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

    .faq-item {
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      background: #fff;
      overflow: hidden;
      box-shadow: 3px 3px 0px var(--text-main);
    }

    .faq-question {
      padding: 18px 22px;
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      padding: 0 22px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease-out, padding 0.25s ease;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      background: #fafafa;
      border-top: 0px solid var(--border-color);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 22px 20px;
      border-top: 1px solid var(--border-color);
    }

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

    /* 表单与咨询区域 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 36px;
      align-items: start;
    }

    .contact-info-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: 5px 5px 0px var(--text-main);
    }

    .contact-list {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-entry {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
    }

    .contact-entry-icon {
      width: 36px;
      height: 36px;
      background: #e0e7ff;
      border: 2px solid var(--text-main);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      font-weight: bold;
    }

    .form-box {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: 5px 5px 0px var(--contrast-pop);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 2px solid var(--text-main);
      border-radius: 8px;
      background: #fff;
      color: var(--text-main);
      outline: none;
      transition: box-shadow 0.15s;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      box-shadow: 3px 3px 0px var(--primary);
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章列表与资讯 */
    .article-container {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: 4px 4px 0px var(--text-main);
    }

    .article-links-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      transition: background 0.15s;
    }

    .article-link-item:hover {
      background: #eff6ff;
      border-color: var(--primary);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 2px solid var(--text-main);
      padding: 50px 0 30px;
      color: var(--text-main);
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-col-title {
      font-size: 1.05rem;
      font-weight: 900;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .footer-col-links li {
      margin-bottom: 10px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-col-links li a:hover {
      color: var(--primary);
    }

    .footer-qr-card {
      display: inline-block;
      background: #fff;
      border: 2px solid var(--text-main);
      padding: 8px;
      border-radius: 8px;
      box-shadow: 3px 3px 0px var(--text-main);
      max-width: 140px;
      text-align: center;
    }

    .footer-qr-card img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .footer-qr-card span {
      font-size: 0.75rem;
      font-weight: 800;
      display: block;
      margin-top: 6px;
    }

    .friendly-links-wrap {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friendly-links-title {
      font-size: 0.9rem;
      font-weight: 900;
      margin-bottom: 10px;
    }

    .friendly-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friendly-links-row a {
      font-size: 0.85rem;
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

    .friendly-links-row a:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #fff;
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 浮动客服入口 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--contrast-pop);
      color: #ffffff;
      border: 2px solid var(--text-main);
      padding: 12px 18px;
      border-radius: 50px;
      font-weight: 900;
      font-size: 0.9rem;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: transform 0.2s ease;
    }

    .floating-kefu:hover {
      transform: translateY(-3px);
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .grid-4, .hero-stats-grid, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .case-gallery, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--text-main);
        flex-direction: column;
        padding: 20px;
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        padding: 12px;
      }
      .nav-actions {
        margin-top: 14px;
        width: 100%;
        justify-content: center;
      }
      .grid-3, .grid-4, .hero-stats-grid, .process-steps, .case-gallery, .reviews-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .review-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }