:root {
      --primary: #2563EB;
      --primary-dark: #1D4ED8;
      --accent-orange: #FF5A1F;
      --accent-yellow: #FFB800;
      --accent-cyan: #06B6D4;
      --accent-purple: #7C3AED;
      --accent-pink: #EC4899;
      --accent-green: #10B981;
      --bg-light: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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-light);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 15px;
      overflow-x: hidden;
    }

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

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

    /* 容器规范 */
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid #EEF2F6;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 19px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      font-size: 11px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent-orange), #FF8A00);
      color: #fff;
      padding: 2px 7px;
      border-radius: 4px;
      text-transform: uppercase;
    }

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

    .nav-links li a {
      font-weight: 600;
      font-size: 14px;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      position: relative;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(37, 99, 235, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
      font-size: 14px;
      padding: 10px 20px;
      border-radius: 99px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--accent-orange), #FF7B00);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.35);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 90, 31, 0.5);
    }

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

    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    .btn-dark {
      background: #0F172A;
      color: #FFFFFF;
    }

    .btn-dark:hover {
      background: #334155;
      transform: translateY(-2px);
    }

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

    /* 模块通用标题与结构 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 4px 12px;
      border-radius: 99px;
      margin-bottom: 12px;
      color: var(--primary);
      background: rgba(37, 99, 235, 0.1);
      border: 1px solid rgba(37, 99, 235, 0.2);
    }

    .section-title-wrap h2 {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

    .section-title-wrap p {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 首屏 HERO 区域 - 严格无图片纯色彩几何设计 */
    .hero-section {
      padding: 75px 0 65px;
      background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(255, 90, 31, 0.08) 0%, transparent 40%),
                  linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      border-bottom: 1px solid #E2E8F0;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-content h1 .color-blue {
      color: var(--primary);
    }

    .hero-content h1 .color-orange {
      color: var(--accent-orange);
    }

    .hero-desc {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 36px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .badge-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      padding: 6px 12px;
      border-radius: 8px;
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

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

    /* 首屏右侧色彩交互看板（纯代码构建） */
    .hero-board {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 26px;
      border: 2px solid #E2E8F0;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .board-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 2px solid #F1F5F9;
      padding-bottom: 14px;
      margin-bottom: 18px;
    }

    .board-title {
      font-size: 15px;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .status-live {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-green);
      background: #ECFDF5;
      padding: 2px 8px;
      border-radius: 99px;
    }

    .board-metrics-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-bottom: 18px;
    }

    .metric-box {
      padding: 14px;
      border-radius: var(--radius-md);
      background: #F8FAFC;
      border-left: 4px solid var(--primary);
      transition: var(--transition);
    }

    .metric-box:nth-child(2) { border-left-color: var(--accent-orange); }
    .metric-box:nth-child(3) { border-left-color: var(--accent-cyan); }
    .metric-box:nth-child(4) { border-left-color: var(--accent-purple); }

    .metric-box:hover {
      transform: translateY(-2px);
      background: #FFFFFF;
      box-shadow: var(--shadow-md);
    }

    .metric-label {
      font-size: 12px;
      color: var(--text-muted);
      font-weight: 600;
      margin-bottom: 4px;
    }

    .metric-val {
      font-size: 20px;
      font-weight: 900;
      color: var(--text-main);
    }

    .board-console {
      background: #0F172A;
      color: #F8FAFC;
      border-radius: var(--radius-md);
      padding: 14px 18px;
      font-family: Consolas, Monaco, monospace;
      font-size: 13px;
    }

    .console-line {
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
    }

    .console-line:last-child {
      margin-bottom: 0;
    }

    .console-highlight {
      color: #38BDF8;
      font-weight: bold;
    }

    /* 平台矩阵与支持模型跑马灯/网格 */
    .models-marquee-wrap {
      background: #FFFFFF;
      border-top: 1px solid #E2E8F0;
      border-bottom: 1px solid #E2E8F0;
      padding: 24px 0;
    }

    .models-title {
      font-size: 13px;
      font-weight: 800;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .models-grid-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      font-size: 13px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 99px;
      background: #F1F5F9;
      color: var(--text-main);
      border: 1px solid #CBD5E1;
      transition: var(--transition);
    }

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

    /* 通用卡片网格系统 */
    .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;
    }

    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 5px;
      background: linear-gradient(90deg, var(--primary), var(--accent-orange));
      opacity: 0;
      transition: var(--transition);
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: #CBD5E1;
    }

    .service-card:hover::before {
      opacity: 1;
    }

    .card-icon-box {
      width: 50px;
      height: 50px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 900;
      margin-bottom: 18px;
      color: #FFFFFF;
    }

    .bg-blue { background: linear-gradient(135deg, #2563EB, #1D4ED8); }
    .bg-orange { background: linear-gradient(135deg, #FF5A1F, #EA580C); }
    .bg-cyan { background: linear-gradient(135deg, #06B6D4, #0891B2); }
    .bg-purple { background: linear-gradient(135deg, #7C3AED, #6D28D9); }
    .bg-green { background: linear-gradient(135deg, #10B981, #059669); }
    .bg-pink { background: linear-gradient(135deg, #EC4899, #DB2777); }

    .service-card h3 {
      font-size: 18px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
      margin-bottom: 16px;
    }

    .card-footer-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      background: #F1F5F9;
      color: var(--text-muted);
    }

    /* 媒体视觉展示区 */
    .media-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-thumb {
      width: 100%;
      aspect-ratio: 16/9;
      background: #E2E8F0;
      overflow: hidden;
    }

    .media-thumb.square {
      aspect-ratio: 1/1;
    }

    .media-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .media-card:hover .media-thumb img {
      transform: scale(1.04);
    }

    .media-body {
      padding: 20px;
    }

    .media-body h4 {
      font-size: 16px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }

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

    /* 对比评测板块 */
    .review-score-hero {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 30px;
      box-shadow: var(--shadow-lg);
    }

    .score-left h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .score-stars {
      color: var(--accent-yellow);
      font-size: 20px;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }

    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 6px;
      background: rgba(255, 255, 255, 0.1);
      padding: 12px 24px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .score-num {
      font-size: 44px;
      font-weight: 900;
      color: var(--accent-yellow);
      line-height: 1;
    }

    .score-max {
      font-size: 16px;
      color: #94A3B8;
    }

    .compare-table-wrap {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
      min-width: 640px;
    }

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

    .compare-table th {
      background: #F8FAFC;
      font-weight: 800;
      color: var(--text-main);
    }

    .compare-table .highlight-col {
      background: #EFF6FF;
      font-weight: 700;
      color: var(--primary);
    }

    .tag-yes {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: var(--accent-green);
      font-weight: 700;
    }

    .tag-no {
      color: #94A3B8;
    }

    /* 步骤流程与时间线 */
    .steps-grid {
      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-lg);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--accent-orange);
      opacity: 0.85;
      margin-bottom: 12px;
      line-height: 1;
    }

    .step-card h4 {
      font-size: 17px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 用户评论卡片 */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

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

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }

    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      color: #FFFFFF;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }

    .user-meta h5 {
      font-size: 14px;
      font-weight: 800;
      color: var(--text-main);
    }

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

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 20px;
      font-size: 15px;
      font-weight: 800;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      background: #FFFFFF;
    }

    .faq-question:hover {
      background: #F8FAFC;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.3s ease;
      font-weight: 900;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 20px;
      background: #F8FAFC;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 14px 20px 18px;
      border-top: 1px solid #EEF2F6;
    }

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

    /* 需求表单与联系我们 */
    .contact-container {
      background: #FFFFFF;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1.5px solid #CBD5E1;
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background: #F8FAFC;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

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

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 20px;
    }

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

    .contact-icon-badge {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: #F8FAFC;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: inline-block;
      text-align: center;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      margin: 0 auto 8px auto;
      border-radius: var(--radius-sm);
      border: 1px solid #CBD5E1;
    }

    .qr-box span {
      font-size: 12px;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 资讯与外链板块 */
    .articles-block {
      background: #F1F5F9;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-top: 30px;
    }

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

    .article-link-pill {
      background: #FFFFFF;
      padding: 8px 16px;
      border-radius: 99px;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      border: 1px solid #CBD5E1;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

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

    /* 友情链接与页脚 */
    .site-footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 30px;
      border-top: 1px solid #1E293B;
    }

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

    .footer-brand h4 {
      font-size: 20px;
      font-weight: 900;
      color: #FFFFFF;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 14px;
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .footer-links-col h5 {
      font-size: 15px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 16px;
    }

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

    .footer-links-col a {
      color: #94A3B8;
      font-size: 13px;
    }

    .footer-links-col a:hover {
      color: #FFFFFF;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      gap: 14px;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
    }

    .friend-links-wrap a {
      color: #CBD5E1;
      font-size: 12px;
      padding: 3px 8px;
      background: #1E293B;
      border-radius: 4px;
    }

    .friend-links-wrap a:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    /* 悬浮客服面板与返回顶部 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 2px solid #E2E8F0;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 20px;
      transition: var(--transition);
      color: var(--primary);
    }

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

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 2px solid #EEF2F6;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .menu-toggle { display: block; }
      .grid-3 { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: 1fr; }
      .grid-2 { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 28px; }
      .section-wrap { padding: 48px 0; }
      .footer-grid { grid-template-columns: 1fr; }
    }