:root {
      --primary-color: #ff4800;
      --secondary-color: #0b57d0;
      --accent-neon: #00f59b;
      --accent-purple: #7928ca;
      --bg-warm: #fcfbfa;
      --bg-soft: #f4f6fa;
      --bg-white: #ffffff;
      --text-dark: #121620;
      --text-muted: #535c6e;
      --border-color: #e5e8f0;
      --card-shadow: 0 10px 30px rgba(18, 22, 32, 0.06);
      --hover-shadow: 0 18px 40px rgba(255, 72, 0, 0.12);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid #121620;
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-dark);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: #fff1eb;
    }

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

    .btn-nav-primary {
      background-color: var(--primary-color);
      color: #fff !important;
      padding: 10px 20px;
      border-radius: 99px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(255, 72, 0, 0.25);
    }

    .btn-nav-primary:hover {
      background-color: #e03f00;
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(135deg, #fff 0%, #fff7f2 50%, #eff5ff 100%);
      border-bottom: 2px solid var(--text-dark);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background-color: #121620;
      color: var(--accent-neon);
      font-size: 0.82rem;
      font-weight: 800;
      border-radius: 99px;
      margin-bottom: 24px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 3.1rem;
      line-height: 1.15;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(90deg, var(--primary-color), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-main-action {
      background: var(--primary-color);
      color: #ffffff;
      padding: 16px 36px;
      border-radius: 99px;
      font-size: 1.1rem;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 2px solid var(--text-dark);
      box-shadow: 4px 4px 0px var(--text-dark);
    }

    .btn-main-action:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--text-dark);
      color: #ffffff;
    }

    .btn-sub-action {
      background: #ffffff;
      color: var(--text-dark);
      padding: 16px 32px;
      border-radius: 99px;
      font-size: 1.1rem;
      font-weight: 800;
      border: 2px solid var(--text-dark);
      box-shadow: 4px 4px 0px var(--text-dark);
    }

    .btn-sub-action:hover {
      background: #fdf2ed;
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--text-dark);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 2px solid #e5e8f0;
      padding-top: 24px;
    }

    .metric-val {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--secondary-color);
    }

    .metric-lbl {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .hero-feature-board {
      background: #ffffff;
      border: 3px solid var(--text-dark);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 8px 8px 0px var(--secondary-color);
    }

    .board-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
      padding-bottom: 16px;
      border-bottom: 2px dashed #e5e8f0;
    }

    .board-badge {
      background: #ff4800;
      color: #fff;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .model-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-chip {
      background: var(--bg-soft);
      border: 1px solid #d9dfea;
      padding: 6px 14px;
      border-radius: 99px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .model-chip.highlight {
      background: #fff4ed;
      border-color: var(--primary-color);
      color: var(--primary-color);
    }

    /* 通用章节 */
    .section-block {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px;
    }

    .section-subtitle {
      font-size: 0.85rem;
      font-weight: 900;
      color: var(--primary-color);
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 10px;
      display: block;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

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

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

    .about-card-box {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: 6px 6px 0 var(--text-dark);
    }

    .about-card-box h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .about-card-box p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 0.98rem;
    }

    .feature-points {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .feature-points li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .feature-points li::before {
      content: "✓";
      color: var(--primary-color);
      font-weight: 900;
    }

    /* 场景卡片网络 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
      gap: 24px;
    }

    .srv-card {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: 4px 4px 0 #121620;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .srv-card:hover {
      transform: translateY(-4px);
      box-shadow: 6px 8px 0 var(--primary-color);
    }

    .srv-badge {
      display: inline-block;
      align-self: flex-start;
      background: #ebf3ff;
      color: var(--secondary-color);
      font-size: 0.75rem;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 99px;
      margin-bottom: 14px;
    }

    .srv-card h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-dark);
    }

    .srv-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程与步骤 */
    .steps-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .step-item {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 42px;
      height: 42px;
      background: var(--text-dark);
      color: var(--accent-neon);
      font-size: 1.2rem;
      font-weight: 900;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      margin-bottom: 16px;
    }

    .step-item h3 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

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

    /* 案例中心展示 */
    .case-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .media-card {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 4px 4px 0 #121620;
    }

    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #eee;
      overflow: hidden;
      border-bottom: 2px solid var(--text-dark);
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .media-body {
      padding: 24px;
    }

    .media-body h3 {
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 10px;
    }

    .media-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测 */
    .compare-container {
      background: #ffffff;
      border: 3px solid var(--text-dark);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 8px 8px 0 var(--accent-purple);
    }

    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      background: #fff8f5;
      border: 2px solid var(--primary-color);
      border-radius: var(--radius-md);
      padding: 20px 32px;
      margin-bottom: 36px;
    }

    .score-rating {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-val {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary-color);
    }

    .score-max {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.4rem;
      font-weight: 900;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

    .compare-tbl {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

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

    .compare-tbl th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--text-dark);
    }

    .compare-tbl td.highlight {
      background: #fff8f5;
      font-weight: 800;
      color: var(--primary-color);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0 #e5e8f0;
    }

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

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #121620;
      color: #fff;
      font-weight: 900;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-meta h3 {
      font-size: 0.95rem;
      font-weight: 800;
    }

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

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 需求匹配与表单 */
    .form-box {
      background: #ffffff;
      border: 3px solid var(--text-dark);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 8px 8px 0 var(--text-dark);
      max-width: 800px;
      margin: 0 auto;
    }

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

    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 8px;
      font-size: 0.92rem;
    }

    .form-control {
      width: 100%;
      padding: 14px 16px;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-family: inherit;
      background: #fafbfd;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background: #fff;
    }

    .form-grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .btn-submit-form {
      width: 100%;
      padding: 16px;
      background: var(--text-dark);
      color: var(--accent-neon);
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1.1rem;
      font-weight: 900;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-submit-form:hover {
      background: var(--primary-color);
      color: #fff;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

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

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 900;
      color: var(--primary-color);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

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

    /* 最新文章与资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 24px;
    }

    .article-item {
      background: #fff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-sm);
      padding: 20px;
      box-shadow: 3px 3px 0 var(--text-dark);
    }

    .article-item a {
      font-weight: 700;
      color: var(--text-dark);
      display: block;
      margin-bottom: 8px;
    }

    .article-item a:hover {
      color: var(--primary-color);
    }

    /* 页脚 */
    .site-footer {
      background-color: #121620;
      color: #ffffff;
      padding: 64px 0 32px;
      border-top: 4px solid var(--primary-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 20px;
      color: #ffffff;
      border-left: 3px solid var(--primary-color);
      padding-left: 10px;
    }

    .footer-col p, .footer-col li {
      font-size: 0.9rem;
      color: #a0aec0;
      line-height: 1.8;
      list-style: none;
    }

    .footer-links li a {
      color: #a0aec0;
    }

    .footer-links li a:hover {
      color: var(--accent-neon);
    }

    .footer-qr-card {
      background: #ffffff;
      border-radius: var(--radius-sm);
      padding: 8px;
      display: inline-block;
      max-width: 140px;
    }

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

    .footer-bottom {
      border-top: 1px solid #2d3748;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #718096;
    }

    .friend-links-box {
      margin-bottom: 24px;
      padding-bottom: 20px;
      border-bottom: 1px solid #2d3748;
    }

    .friend-links-box span {
      color: #ffffff;
      font-weight: 700;
      margin-right: 12px;
    }

    .friend-links-box a {
      color: #a0aec0;
      margin-right: 14px;
      font-size: 0.88rem;
    }

    .friend-links-box a:hover {
      color: var(--accent-neon);
    }

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 32px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--text-dark);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--accent-neon);
      box-shadow: 0 8px 20px rgba(0,0,0,0.25);
      cursor: pointer;
      font-size: 0.85rem;
      font-weight: 800;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-color);
      transform: scale(1.08);
    }

    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
    }

    .banner-item {
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .banner-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 移动端响应式 */
    @media (max-width: 992px) {
      .hero-grid, .about-layout, .case-container {
        grid-template-columns: 1fr;
      }
      .steps-timeline {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--text-dark);
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .steps-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-grid-2 {
        grid-template-columns: 1fr;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
    }