:root {
      --brand-primary: #3b82f6;
      --brand-violet: #8b5cf6;
      --brand-rose: #f43f5e;
      --brand-amber: #f59e0b;
      --brand-emerald: #10b981;
      --brand-cyan: #06b6d4;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --border-subtle: #e2e8f0;
      --border-focus: #cbd5e1;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --radius-sm: 8px;
      --radius-md: 12px;
      --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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(244, 63, 94, 0.06) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(139, 92, 246, 0.04) 0px, transparent 60%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.06) 0px, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 99;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
    }

    .brand-box .logo-wrapper {
      width: 42px;
      height: 42px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      background: #f1f5f9;
      overflow: hidden;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #1e293b 0%, #3b82f6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--brand-primary);
      background: rgba(59, 130, 246, 0.08);
    }

    .header-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-solid-rainbow {
      background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
    }

    .btn-solid-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
      color: #ffffff;
    }

    .btn-light {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-subtle);
    }

    .btn-light:hover {
      background: #f8fafc;
      border-color: var(--border-focus);
      color: var(--brand-primary);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 区域共用 */
    section.section-wrapper {
      padding: 72px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      border-radius: 999px;
      background: rgba(59, 130, 246, 0.1);
      color: var(--brand-primary);
      margin-bottom: 12px;
    }

    .section-tag.rose {
      background: rgba(244, 63, 94, 0.1);
      color: var(--brand-rose);
    }

    .section-tag.amber {
      background: rgba(245, 158, 11, 0.1);
      color: var(--brand-amber);
    }

    .section-tag.emerald {
      background: rgba(16, 185, 129, 0.1);
      color: var(--brand-emerald);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero 无图片设计 */
    .hero-section {
      padding: 88px 0 64px;
      text-align: center;
      position: relative;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid rgba(59, 130, 246, 0.2);
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-wrap .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand-emerald);
      animation: pulse 2s infinite;
    }

    .hero-badge-wrap span {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
    }

    h1.hero-main-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -1px;
      color: #0f172a;
      max-width: 920px;
      margin: 0 auto 20px;
    }

    h1.hero-main-title span.gradient-text {
      background: linear-gradient(135deg, #2563eb, #7c3aed, #db2777);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }

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

    .btn-hero-official {
      padding: 14px 32px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #f43f5e 100%);
      border-radius: var(--radius-md);
      box-shadow: 0 10px 25px -3px rgba(37, 99, 235, 0.4);
      border: none;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .btn-hero-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px -3px rgba(37, 99, 235, 0.55);
      color: #ffffff;
    }

    .btn-hero-secondary {
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: all 0.2s ease;
      box-shadow: var(--shadow-sm);
    }

    .btn-hero-secondary:hover {
      background: #f8fafc;
      border-color: var(--border-focus);
      color: var(--brand-primary);
    }

    /* 纯 CSS 科技几何展台 (代替首屏图片) */
    .hero-tech-board {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-lg);
      margin-top: 24px;
    }

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

    .metric-card {
      padding: 20px;
      background: #f8fafc;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      text-align: left;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--brand-primary);
    }

    .metric-card.pink::before { background: var(--brand-rose); }
    .metric-card.amber::before { background: var(--brand-amber); }
    .metric-card.emerald::before { background: var(--brand-emerald); }

    .metric-card .num {
      font-size: 28px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-card .lbl {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台聚合标签条 */
    .model-capsule-bar {
      margin-top: 32px;
      padding-top: 24px;
      border-top: 1px dashed var(--border-subtle);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }

    .model-capsule-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
      margin-right: 8px;
    }

    .chip {
      padding: 5px 12px;
      font-size: 12px;
      font-weight: 600;
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: 999px;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .chip:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      transform: translateY(-1px);
    }

    /* 核心矩阵与卡片 */
    .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: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--border-focus);
    }

    .feature-card .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 16px;
      color: #ffffff;
    }

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

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-card .card-footer-tip {
      margin-top: 16px;
      padding-top: 12px;
      border-top: 1px solid #f1f5f9;
      font-size: 12px;
      color: var(--brand-primary);
      font-weight: 600;
    }

    /* 真实媒体图片区域 */
    .media-block-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      align-items: center;
      margin-top: 32px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: var(--shadow-md);
    }

    .media-img-holder {
      width: 100%;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #f1f5f9;
    }

    .media-img-holder img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: contain;
    }

    .media-desc {
      margin-top: 12px;
      font-size: 14px;
      color: var(--text-muted);
      text-align: center;
    }

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-violet));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .step-item h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格板块 */
    .compare-container {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #eff6ff 0%, #fdf2f8 100%);
      padding: 20px 24px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(59, 130, 246, 0.15);
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-meta h3 {
      font-size: 20px;
      font-weight: 800;
      color: #1e293b;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 18px;
    }

    .score-badge {
      font-size: 32px;
      font-weight: 900;
      color: var(--brand-primary);
    }

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

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

    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    table.compare-table th, 
    table.compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-subtle);
    }

    table.compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    table.compare-table td.highlight {
      background: rgba(59, 130, 246, 0.04);
      color: var(--brand-primary);
      font-weight: 600;
    }

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

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

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

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

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #ffffff;
      font-size: 16px;
    }

    .user-text .uname {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-text .urole {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-node {
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s;
    }

    .faq-node.active {
      border-color: var(--brand-primary);
      box-shadow: var(--shadow-md);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--text-muted);
      transition: transform 0.2s;
    }

    .faq-node.active .faq-icon {
      transform: rotate(45deg);
      color: var(--brand-primary);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f8fafc;
      background: #fafafa;
    }

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

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }

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

    .contact-qr-box {
      background: #f8fafc;
      border: 1px solid var(--border-subtle);
      padding: 16px;
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      width: fit-content;
    }

    .contact-qr-box img {
      width: 120px;
      height: 120px;
      object-fit: contain;
    }

    .form-panel {
      background: #f8fafc;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
    }

    .form-group {
      margin-bottom: 16px;
    }

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

    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 14px;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--brand-primary);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* 资讯与友情链接 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 12px;
    }

    .art-link-btn {
      display: block;
      padding: 12px 16px;
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      text-decoration: none;
      font-size: 13px;
      transition: all 0.2s;
    }

    .art-link-btn:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      background: #eff6ff;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      justify-content: center;
      padding: 20px 0;
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: var(--text-muted);
      text-decoration: none;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-subtle);
      border-radius: 999px;
      transition: all 0.2s;
    }

    .friend-links-wrap a:hover {
      color: var(--brand-primary);
      border-color: var(--brand-primary);
    }

    /* 页脚 */
    footer.site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-subtle);
      padding: 48px 0 24px;
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-col h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 100;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .kefu-btn-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-violet));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
      cursor: pointer;
      text-decoration: none;
      font-size: 20px;
      border: none;
      transition: transform 0.2s;
    }

    .kefu-btn-circle:hover {
      transform: scale(1.08);
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.15); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    /* 移动端适配 */
    @media (max-width: 992px) {
      .board-metric-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top-grid { grid-template-columns: repeat(2, 1fr); }
      .media-block-grid { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      nav.nav-bar {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-subtle);
        display: none;
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
      }
      nav.nav-bar.active { display: block; }
      .nav-links { flex-direction: column; align-items: flex-start; gap: 0; }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; padding: 10px 0; }
      h1.hero-main-title { font-size: 28px; }
      .board-metric-grid { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: 1fr; }
      .step-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .footer-top-grid { grid-template-columns: 1fr; }
    }