:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent-pink: #ec4899;
      --accent-orange: #f97316;
      --accent-yellow: #eab308;
      --accent-green: #10b981;
      --accent-purple: #8b5cf6;
      --rainbow-grad: linear-gradient(135deg, #ef4444, #f97316, #eab308, #10b981, #06b6d4, #3b82f6, #8b5cf6);
      --rainbow-soft: linear-gradient(120deg, rgba(239, 68, 68, 0.08), rgba(249, 115, 22, 0.08), rgba(234, 179, 8, 0.08), rgba(16, 185, 129, 0.08), rgba(6, 182, 212, 0.08), rgba(99, 102, 241, 0.08));
      --rainbow-border: linear-gradient(90deg, #ec4899, #f59e0b, #10b981, #3b82f6, #8b5cf6);
      --bg-main: #fcfdfe;
      --bg-subtle: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --shadow-lg: 0 20px 35px -5px rgba(15, 23, 42, 0.09), 0 10px 10px -5px rgba(15, 23, 42, 0.03);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-width: 1240px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      background-image: 
        radial-gradient(at 0% 0%, rgba(236, 72, 153, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.06) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(16, 185, 129, 0.04) 0px, transparent 60%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.06) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(245, 158, 11, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    /* 统一居中容器 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部彩虹细条装饰 */
    .rainbow-top-bar {
      height: 4px;
      width: 100%;
      background: var(--rainbow-grad);
      position: fixed;
      top: 0;
      left: 0;
      z-index: 1001;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 4px;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      z-index: 1000;
      transition: box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    }

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

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

    .brand-logo-wrap {
      max-width: 150px;
      display: flex;
      align-items: center;
    }

    .brand-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #fef2f2, #eff6ff);
      border: 1px solid #fed7aa;
      color: #ea580c;
      letter-spacing: 0.5px;
    }

    /* 限制规则：.nav-links的gap属性设置为0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      transition: color 0.2s ease, background-color 0.2s ease;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: rgba(79, 70, 229, 0.05);
    }

    .nav-actions {
      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-full);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      white-space: nowrap;
    }

    .btn-sm {
      padding: 7px 16px;
      font-size: 13px;
    }

    .btn-rainbow {
      background: linear-gradient(135deg, #6366f1, #3b82f6, #06b6d4);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
    }

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

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

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
      transform: translateY(-1px);
    }

    .btn-hero-primary {
      padding: 14px 32px;
      font-size: 16px;
      background: var(--rainbow-grad);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(79, 70, 229, 0.3);
      position: relative;
      overflow: hidden;
    }

    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(79, 70, 229, 0.4);
      color: #ffffff;
    }

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

    /* 区域通用样式 */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px auto;
    }

    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 14px;
      border-radius: var(--radius-full);
      background: #ffffff;
      border: 1px solid #e0e7ff;
      color: var(--primary);
      margin-bottom: 14px;
      box-shadow: 0 2px 6px rgba(99, 102, 241, 0.08);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 首屏 HERO（严格无图片） */
    .hero-section {
      padding: 70px 0 60px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 6px 16px;
      border-radius: var(--radius-full);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .rainbow-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--rainbow-grad);
      display: inline-block;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.9); opacity: 0.8; }
      50% { transform: scale(1.2); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.8; }
    }

    .hero-title {
      font-size: 44px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      letter-spacing: -1px;
      max-width: 960px;
      margin: 0 auto 20px auto;
    }

    .hero-highlight {
      background: linear-gradient(135deg, #ef4444, #f97316, #06b6d4, #4f46e5);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 32px auto;
      line-height: 1.7;
    }

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

    /* 首屏纯CSS科技与数据卡片看板（严格替代图片） */
    .hero-board {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      padding: 30px;
      position: relative;
      margin-top: 10px;
    }

    .hero-board::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--rainbow-grad);
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .board-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 16px;
      margin-bottom: 24px;
    }

    .board-status {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 600;
      color: var(--accent-green);
    }

    .board-status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent-green);
    }

    .model-pills-flow {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 28px;
    }

    .model-pill {
      font-size: 12px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    .model-pill .dot-color {
      width: 6px;
      height: 6px;
      border-radius: 50%;
    }

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

    .stat-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      text-align: center;
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .stat-box:hover {
      transform: translateY(-3px);
      border-color: #cbd5e1;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-size: 26px;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 4px;
    }

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

    /* 多彩卡片与通用网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .rainbow-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
      overflow: hidden;
    }

    .rainbow-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }

    .card-stripe {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
    }

    .stripe-red { background: #ef4444; }
    .stripe-orange { background: #f97316; }
    .stripe-yellow { background: #eab308; }
    .stripe-green { background: #10b981; }
    .stripe-cyan { background: #06b6d4; }
    .stripe-blue { background: #3b82f6; }
    .stripe-purple { background: #8b5cf6; }
    .stripe-pink { background: #ec4899; }

    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 16px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
    }

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

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 14px;
    }

    .badge-soft {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 4px;
      background: #f1f5f9;
      color: #475569;
    }

    /* 平台介绍与关于我们 */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .features-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .feature-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
    }

    .feature-check {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: rgba(16, 185, 129, 0.15);
      color: var(--accent-green);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: bold;
      flex-shrink: 0;
      margin-top: 2px;
    }

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

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

    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: #e2e8f0;
      margin-bottom: 8px;
      line-height: 1;
    }

    /* 案例图片展示容器 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-thumb-box {
      width: 100%;
      background: #f1f5f9;
      position: relative;
      overflow: hidden;
    }

    .media-thumb-box img {
      width: 100%;
      height: auto;
      max-width: 100%;
      display: block;
      transition: transform 0.4s ease;
      object-fit: cover;
    }

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

    .media-content {
      padding: 20px;
      flex: 1;
    }

    /* 对比评测表格与卡片 */
    .review-score-banner {
      background: linear-gradient(135deg, #f8fafc, #f1f5f9);
      border: 2px solid #e2e8f0;
      border-radius: var(--radius-lg);
      padding: 28px 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 36px;
      position: relative;
      overflow: hidden;
    }

    .review-score-banner::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--rainbow-grad);
    }

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

    .score-big {
      font-size: 52px;
      font-weight: 900;
      color: #ea580c;
      line-height: 1;
    }

    .score-max {
      font-size: 20px;
      color: var(--text-muted);
      font-weight: 600;
    }

    .star-rate {
      color: #f59e0b;
      font-size: 22px;
      letter-spacing: 2px;
    }

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

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

    .table-compare th, 
    .table-compare td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .table-compare tr:hover td {
      background: rgba(248, 250, 252, 0.7);
    }

    .col-highlight {
      background: rgba(79, 70, 229, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    /* 需求匹配与表单 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .form-wrapper::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--rainbow-grad);
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-full {
      grid-column: span 2;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

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

    /* FAQ 折叠面板 */
    .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-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      transition: transform 0.3s ease, background 0.3s ease;
      flex-shrink: 0;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: var(--primary);
      color: #ffffff;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }

    /* 用户评论卡片 */
    .comment-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;
    }

    .comment-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 14px;
    }

    .comment-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #e0e7ff, #fce7f3);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
      font-size: 16px;
      border: 2px solid #ffffff;
      box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    }

    .comment-user-name {
      font-weight: 700;
      font-size: 15px;
      color: var(--text-main);
    }

    .comment-user-role {
      font-size: 12px;
      color: var(--text-light);
    }

    .comment-stars {
      color: #f59e0b;
      font-size: 13px;
      margin-bottom: 12px;
    }

    .comment-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 文章列表与外链区 */
    .article-card-row {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      transition: all 0.2s ease;
      box-shadow: var(--shadow-sm);
    }

    .article-card-row:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    /* 联系我们与客服渠道 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .qr-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f8fafc;
      border: 1px dashed #cbd5e1;
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      margin-top: 20px;
    }

    .qr-img-wrap {
      max-width: 170px;
      background: #ffffff;
      padding: 8px;
      border-radius: 8px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 12px;
    }

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

    /* 悬浮客服面板 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 28px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: var(--text-main);
      cursor: pointer;
      transition: all 0.25s ease;
      position: relative;
    }

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

    .floating-qr-popover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 190px;
      text-align: center;
    }

    .floating-btn:hover .floating-qr-popover {
      display: block;
    }

    /* 统一页脚体系（深色字、高对比度、无重复） */
    .site-footer {
      background: #f1f5f9;
      border-top: 1px solid #e2e8f0;
      padding-top: 56px;
      padding-bottom: 36px;
      color: var(--text-main);
      margin-top: 40px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .footer-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .friend-links-area {
      border-top: 1px solid #e2e8f0;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-list a {
      font-size: 13px;
      color: var(--text-muted);
      background: #ffffff;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
    }

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

    .footer-bottom {
      border-top: 1px solid #e2e8f0;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 36px; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-wrapper { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .site-header { position: sticky; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links li a { padding: 12px 0; width: 100%; }
      .nav-actions .btn { display: none; }
      
      .hero-title { font-size: 28px; }
      .section-title { font-size: 24px; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .features-list { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-full { grid-column: span 1; }
      .contact-layout { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .review-score-banner { flex-direction: column; text-align: center; }
      .score-badge-group { justify-content: center; }
    }