:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #ecf2fe;
      --accent: #00a870;
      --warning: #ed7b2f;
      --text-main: #1d2129;
      --text-sub: #4e5969;
      --text-muted: #86909c;
      --bg-main: #f5f7fa;
      --bg-card: #ffffff;
      --border-color: #e5e6eb;
      --border-light: #f2f3f5;
      --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.04);
      --shadow-md: 0 6px 16px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 12px 32px rgba(0, 82, 217, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-max: 1200px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: #f5f7fa;
      background-image: 
        radial-gradient(at 0% 0%, rgba(0, 82, 217, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 168, 112, 0.03) 0px, transparent 50%);
      background-attachment: fixed;
      min-height: 100vh;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
    }

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

    ul, ol {
      list-style: none;
    }

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

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

    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

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

    .section-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

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

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

    .brand-logo-wrap {
      width: 130px;
      display: flex;
      align-items: center;
    }

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

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-sub);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

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

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

    .btn-nav-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      color: #ffffff;
      background: var(--primary);
      border-radius: 6px;
      border: 1px solid var(--primary);
      box-shadow: 0 2px 6px rgba(0, 82, 217, 0.25);
    }

    .btn-nav-portal:hover {
      background: var(--primary-hover);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* Hero 首屏 (严格无图片，深宝蓝明艳几何风) */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(135deg, #ffffff 0%, #f0f5ff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-glow-1 {
      position: absolute;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(0, 82, 217, 0.12) 0%, transparent 70%);
      top: -120px;
      left: -80px;
      pointer-events: none;
    }

    .hero-glow-2 {
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0, 168, 112, 0.08) 0%, transparent 70%);
      bottom: -60px;
      right: -60px;
      pointer-events: none;
    }

    .hero-inner {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-pre-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #cce0ff;
      border-radius: 30px;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 22px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      color: #0b1d3a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-lead {
      font-size: 18px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .btn-hero-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #0052d9 0%, #003cab 100%);
      border-radius: var(--radius-sm);
      border: none;
      box-shadow: 0 4px 14px rgba(0, 82, 217, 0.35);
    }

    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 82, 217, 0.45);
    }

    .btn-hero-sub {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary);
      background: #ffffff;
      border: 1px solid var(--primary);
      border-radius: var(--radius-sm);
    }

    .btn-hero-sub:hover {
      background: var(--primary-light);
    }

    .hero-stats-panel {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-light);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 聚合模型展标 */
    .model-scroll-strip {
      background: #ffffff;
      padding: 20px 0;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      padding: 5px 12px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-sub);
    }

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

    /* 关于与平台介绍 */
    .platform-overview-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .overview-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .overview-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #b5c7ff;
    }

    .overview-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-weight: 700;
      font-size: 18px;
    }

    .overview-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 服务能力卡片列表 */
    .feature-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .feature-tag {
      font-size: 11px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .feature-card h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .feature-card p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 素材案例画廊 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-img-holder {
      width: 100%;
      background: #eef2f8;
      overflow: hidden;
      position: relative;
    }

    .media-img-holder img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .media-card:hover .media-img-holder img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
    }

    .media-info h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 13px;
      color: var(--text-sub);
    }

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

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

    .banner-item img {
      width: 100%;
      height: 140px;
      object-fit: cover;
    }

    .banner-item-caption {
      padding: 10px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-sub);
      text-align: center;
      background: #ffffff;
    }

    /* 对比评测表格 */
    .eval-score-banner {
      background: linear-gradient(90deg, #0052d9 0%, #0b3fa8 100%);
      border-radius: var(--radius-md);
      color: #ffffff;
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-info h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .eval-score-info p {
      font-size: 14px;
      opacity: 0.9;
    }

    .eval-score-display {
      text-align: right;
    }

    .eval-rating-val {
      font-size: 38px;
      font-weight: 800;
      line-height: 1;
      color: #ffd666;
    }

    .eval-rating-max {
      font-size: 16px;
      opacity: 0.85;
    }

    .eval-stars {
      color: #ffd666;
      font-size: 18px;
      margin-top: 4px;
    }

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

    .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 var(--border-light);
    }

    .compare-table th {
      background: #f8faff;
      color: var(--text-main);
      font-weight: 700;
    }

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

    .compare-table .highlight-col {
      background: #f4f8ff;
      color: var(--primary);
      font-weight: 600;
    }

    .badge-win {
      display: inline-block;
      padding: 2px 8px;
      background: #e7f7ed;
      color: var(--accent);
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }

    /* 流程与行业方案 */
    .step-grid-5 {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      position: relative;
    }

    .step-number {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 14px;
      right: 16px;
    }

    .step-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 需求匹配与表单 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .contact-aside {
      background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
      padding: 40px;
      border-right: 1px solid var(--border-color);
    }

    .contact-aside h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #0b1d3a;
    }

    .contact-aside p {
      font-size: 14px;
      color: var(--text-sub);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 16px;
      font-size: 14px;
      color: var(--text-main);
    }

    .contact-meta-item strong {
      color: var(--text-sub);
      min-width: 85px;
    }

    .qr-box {
      margin-top: 24px;
      padding: 16px;
      background: #ffffff;
      border: 1px dashed #b5c7ff;
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      margin: 0 auto 8px;
    }

    .qr-box span {
      display: block;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-sub);
    }

    .form-pane {
      padding: 40px;
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #fdfdfd;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.1);
    }

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

    .btn-submit {
      width: 100%;
      padding: 13px 20px;
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      background: var(--primary);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.2);
    }

    .btn-submit:hover {
      background: var(--primary-hover);
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testi-text {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 18px;
      position: relative;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .author-info h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-header {
      width: 100%;
      padding: 16px 20px;
      text-align: left;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      background: none;
      border: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-header:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-weight: 700;
      transition: transform 0.25s;
    }

    .faq-body {
      padding: 0 20px 16px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
      display: none;
    }

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

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

    /* 资讯与友情链接 */
    .article-links-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }

    .article-pill-group {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .article-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 13px;
      color: var(--text-sub);
    }

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

    .friend-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
    }

    .friend-links-group {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 10px;
    }

    .friend-links-group a {
      font-size: 13px;
      color: var(--text-sub);
      padding: 4px 10px;
      background: var(--bg-main);
      border-radius: 4px;
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 24px;
      margin-top: auto;
      border-top: 1px solid #1e293b;
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      padding-bottom: 32px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .footer-col p {
      font-size: 13px;
      line-height: 1.6;
      margin-bottom: 8px;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      font-size: 13px;
    }

    .footer-bottom a {
      color: #cbd5e1;
    }

    /* 浮动组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }

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

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .feature-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .platform-overview-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-grid-5 {
        grid-template-columns: repeat(3, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-strip-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-panel {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .section-wrap {
        padding: 45px 0;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-lead {
        font-size: 15px;
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .contact-aside {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 24px;
      }
      .form-pane {
        padding: 24px;
      }
      .feature-grid-4, .platform-overview-grid, .testimonial-grid, .media-gallery-grid {
        grid-template-columns: 1fr;
      }
      .step-grid-5 {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .eval-score-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
      .eval-score-display {
        text-align: left;
      }
    }