:root {
      --primary: #ff5a00;
      --primary-hover: #e04e00;
      --primary-light: #fff3ec;
      --primary-glow: rgba(255, 90, 0, 0.18);
      --accent-red: #ff2a2a;
      --accent-gold: #ffaa00;
      --bg-page: #fdfaf7;
      --bg-card: #ffffff;
      --bg-alt: #f7f2ed;
      --text-main: #1f2024;
      --text-sub: #575a65;
      --text-muted: #8b8f9e;
      --border-color: #eeddd2;
      --shadow-sm: 0 4px 12px rgba(255, 90, 0, 0.05);
      --shadow-md: 0 8px 24px rgba(255, 90, 0, 0.08);
      --shadow-hover: 0 16px 36px rgba(255, 90, 0, 0.16);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "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;
    }

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

    ul, ol {
      list-style: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      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, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 30px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-red), var(--primary));
      color: #ffffff;
      box-shadow: 0 6px 18px rgba(255, 90, 0, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #ea1d1d, #e04e00);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255, 90, 0, 0.38);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero (严禁出现图片，仅用纯CSS/渐变/几何块/科技卡片) */
    .hero-section {
      position: relative;
      background: radial-gradient(100% 80% at 50% 0%, #fff1e5 0%, var(--bg-page) 100%);
      padding: 80px 0 60px;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-ambient-circle {
      position: absolute;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(255, 120, 0, 0.12), transparent 70%);
      top: -100px;
      right: -80px;
      pointer-events: none;
    }

    .hero-inner {
      text-align: center;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
      animation: pulseDot 2s infinite;
    }

    @keyframes pulseDot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: #121316;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(120deg, #ff2a2a, #ff6a00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

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

    .btn-hero-main {
      padding: 14px 38px;
      font-size: 17px;
      font-weight: 700;
    }

    /* 首屏数据指标卡片 */
    .hero-metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
      text-align: left;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: linear-gradient(to bottom, var(--primary), var(--accent-red));
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: baseline;
      gap: 4px;
      margin-bottom: 6px;
    }

    .metric-num em {
      font-style: normal;
      color: var(--primary);
      font-size: 20px;
    }

    .metric-label {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-note {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 区域通用结构 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background: #fbf7f2;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 20px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
      border: 1px solid rgba(255, 90, 0, 0.2);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 模型矩阵与生态跑马标 */
    .model-chip-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1060px;
      margin: 0 auto;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 24px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .model-chip::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary);
    }

    .model-chip:hover {
      border-color: var(--primary);
      background: var(--primary-light);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 平台介绍板块 */
    .about-feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .about-item-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .about-item-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(255, 90, 0, 0.4);
      transform: translateY(-4px);
    }

    .about-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .about-item-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .about-item-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 场景与核心服务网格 */
    .service-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .service-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      padding: 3px 10px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .service-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 一站式全自动流程 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .process-step {
      background: #ffffff;
      padding: 26px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-badge {
      display: inline-block;
      width: 34px;
      height: 34px;
      line-height: 34px;
      text-align: center;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      margin-bottom: 16px;
      box-shadow: 0 4px 10px rgba(255, 90, 0, 0.3);
    }

    .process-step h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .process-step p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 对比评测模块 */
    .compare-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 36px;
    }

    .rating-highlight {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #fff3eb 0%, #ffe7d8 100%);
      padding: 24px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      border: 1px solid rgba(255, 90, 0, 0.2);
    }

    .rating-left h3 {
      font-size: 22px;
      font-weight: 800;
      color: #bf3900;
      margin-bottom: 4px;
    }

    .rating-left p {
      font-size: 14px;
      color: #723b1e;
    }

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

    .stars {
      color: #ff9100;
      font-size: 22px;
      letter-spacing: 2px;
    }

    .score-badge {
      font-size: 34px;
      font-weight: 900;
      color: var(--primary);
    }

    .score-badge small {
      font-size: 16px;
      color: var(--text-sub);
      font-weight: 600;
    }

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

    .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 #f0e6de;
    }

    .compare-table th {
      background: #faf4ef;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table tr:hover td {
      background: #fffcf9;
    }

    .col-highlight {
      background: #fff8f3;
      font-weight: 600;
      color: var(--primary);
    }

    .badge-check {
      display: inline-block;
      color: #0bb55e;
      font-weight: bold;
      margin-right: 6px;
    }

    /* 宣传图与案例展示 (首屏之后展示真实物料) */
    .banner-showcase {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 40px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
      background: #fff;
    }

    .banner-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

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

    .case-img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 客户评价板块 (6条评论) */
    .testimonial-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-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.3s ease;
    }

    .testimonial-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-gold));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

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

    .reviewer-info span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
    }

    .article-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-link-chip {
      background: #faf5f0;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

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

    /* FAQ 折叠面板 (不少于10个) */
    .faq-list {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

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

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      border-top: 1px dashed #f0e4dc;
      padding-top: 14px;
    }

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

    /* 需求匹配与联系我们表单 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 40px;
    }

    .contact-info-col h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .contact-info-col p {
      font-size: 15px;
      color: var(--text-sub);
      margin-bottom: 24px;
    }

    .contact-detail-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 30px;
    }

    .contact-detail-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: var(--text-main);
    }

    .contact-detail-item strong {
      color: var(--primary);
      min-width: 80px;
    }

    .qr-showcase {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      background: var(--bg-alt);
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .qr-showcase img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: var(--radius-sm);
    }

    .qr-showcase span {
      font-size: 13px;
      color: var(--text-sub);
      margin-top: 8px;
      font-weight: 600;
    }

    /* 表单样式 */
    .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: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #faf8f5;
      color: var(--text-main);
      outline: none;
      transition: all 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 90, 0, 0.12);
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-sm);
    }

    /* 友情链接与底部导航 (深色文字底色安全) */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-sub);
      font-size: 14px;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #f0e6de;
      padding-bottom: 24px;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .friend-links-box {
      padding: 20px 0;
      border-bottom: 1px solid #f0e6de;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      color: var(--text-sub);
      font-size: 13px;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .footer-bottom a {
      color: var(--text-muted);
    }

    .footer-bottom a:hover {
      color: var(--primary);
    }

    /* 悬浮客服面板 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .widget-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 18px;
      transition: all 0.25s ease;
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-feature-grid,
      .service-grid-3,
      .testimonial-grid,
      .process-timeline,
      .banner-showcase {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-btn-group {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        border-bottom: 1px solid var(--border-color);
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-metric-grid,
      .about-feature-grid,
      .service-grid-3,
      .testimonial-grid,
      .process-timeline,
      .banner-showcase {
        grid-template-columns: 1fr;
      }
      .rating-highlight {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .footer-top, .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }