:root {
      --primary-blue: #1d4ed8;
      --primary-bright: #2563eb;
      --primary-dark: #1e3a8a;
      --accent-cyan: #06b6d4;
      --accent-amber: #d97706;
      --bg-light: #f8fafc;
      --bg-soft: #f0f7ff;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
      --shadow-md: 0 4px 12px rgba(30, 58, 138, 0.08);
      --shadow-lg: 0 10px 25px -5px rgba(29, 78, 216, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition-fast: 0.25s ease;
    }

    * {
      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", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      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(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-group .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      font-size: 0.75rem;
      background: var(--bg-soft);
      color: var(--primary-bright);
      padding: 2px 8px;
      border-radius: 999px;
      font-weight: 600;
      border: 1px solid #bfdbfe;
    }

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

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: color var(--transition-fast), background-color var(--transition-fast);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-bright);
      background-color: var(--bg-soft);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: all var(--transition-fast);
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-bright), var(--primary-blue));
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #1d4ed8, #1e40af);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
    }

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

    .btn-outline:hover {
      background: var(--bg-soft);
      border-color: var(--primary-bright);
    }

    .btn-cta-hero {
      background: #ffffff;
      color: var(--primary-blue);
      font-size: 1.1rem;
      padding: 14px 28px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      font-weight: 700;
    }

    .btn-cta-hero:hover {
      background: #eff6ff;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero：无图，纯CSS与几何卡片设计 */
    .hero-section {
      position: relative;
      background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #2563eb 100%);
      color: #ffffff;
      padding: 80px 0 90px;
      overflow: hidden;
    }

    .hero-pattern {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: 
        radial-gradient(circle at 20% 30%, rgba(6, 182, 212, 0.18) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.12) 0%, transparent 45%);
      pointer-events: none;
    }

    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
      color: #e0f2fe;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .hero-desc {
      font-size: 1.1rem;
      line-height: 1.7;
      color: #e2e8f0;
      margin-bottom: 32px;
      max-width: 580px;
    }

    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .hero-tags {
      margin-top: 30px;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .hero-tags span {
      font-size: 0.8rem;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      padding: 4px 10px;
      border-radius: 4px;
      color: #f1f5f9;
    }

    /* 首屏右侧纯CSS科技卡片矩阵 */
    .hero-tech-card {
      background: rgba(255, 255, 255, 0.98);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.8);
      color: var(--text-main);
    }

    .tech-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 20px;
    }

    .tech-card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .tech-status-dot {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.85rem;
      color: #16a34a;
      font-weight: 600;
    }

    .tech-status-dot::before {
      content: "";
      width: 8px;
      height: 8px;
      background: #16a34a;
      border-radius: 50%;
      box-shadow: 0 0 8px #16a34a;
    }

    .tech-spec-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-bottom: 20px;
    }

    .spec-item {
      background: var(--bg-soft);
      padding: 14px;
      border-radius: var(--radius-md);
      border: 1px solid #dbeafe;
    }

    .spec-label {
      font-size: 0.8rem;
      color: var(--text-light);
      margin-bottom: 4px;
    }

    .spec-val {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .model-pill {
      font-size: 0.75rem;
      font-weight: 600;
      background: #f1f5f9;
      color: var(--text-muted);
      padding: 4px 8px;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
    }

    /* 数据指标条 */
    .metric-bar {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
      box-shadow: var(--shadow-sm);
    }

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-bright);
      line-height: 1.1;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 70px 0;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-soft);
    }

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

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-bright);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: #eff6ff;
      padding: 4px 12px;
      border-radius: 999px;
      border: 1px solid #dbeafe;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }

    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 卡片体系 */
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    /* 3列网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    /* 2列网格 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    /* 场景卡片样式 */
    .scene-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, #dbeafe, #eff6ff);
      color: var(--primary-bright);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .scene-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .scene-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .scene-tag-bar {
      margin-top: 14px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .tag-sm {
      font-size: 0.75rem;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      color: var(--text-light);
      padding: 2px 6px;
      border-radius: 4px;
    }

    /* 平台介绍图文板块 */
    .about-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-content h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 16px;
      line-height: 1.35;
    }

    .about-content p {
      font-size: 0.98rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 20px;
    }

    .about-feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 24px;
    }

    .about-feature-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .about-feature-item::before {
      content: "✓";
      color: var(--primary-bright);
      font-weight: bold;
    }

    .media-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 12px;
      box-shadow: var(--shadow-md);
      text-align: center;
    }

    .media-box img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-md);
      display: block;
      margin: 0 auto;
    }

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

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

    .process-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: #dbeafe;
      line-height: 1;
      margin-bottom: 12px;
    }

    .process-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }

    .process-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格与卡片 */
    .review-highlight {
      background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
      border: 1px solid #bfdbfe;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-badge {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--primary-blue);
      line-height: 1;
    }

    .stars {
      color: var(--accent-amber);
      font-size: 1.2rem;
      margin-bottom: 4px;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: var(--bg-soft);
      font-weight: 700;
      color: var(--primary-dark);
    }

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

    .col-highlight {
      background: #f0f7ff;
      font-weight: 600;
      color: var(--primary-blue);
    }

    /* Token 比价卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .price-card.featured {
      border: 2px solid var(--primary-bright);
      box-shadow: var(--shadow-lg);
      transform: scale(1.02);
    }

    .price-badge-top {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary-bright);
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 999px;
    }

    .price-tier {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }

    .price-val {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .price-val span {
      font-size: 0.9rem;
      color: var(--text-light);
      font-weight: 400;
    }

    .price-features {
      list-style: none;
      margin: 20px 0;
      flex-grow: 1;
    }

    .price-features li {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .price-features li::before {
      content: "•";
      color: var(--primary-bright);
      font-size: 1.2rem;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 12px;
      border-top: 1px solid #f1f5f9;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color var(--transition-fast);
    }

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform var(--transition-fast);
      color: var(--primary-bright);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 20px;
      border-top: 1px solid #f1f5f9;
    }

    /* 表单区域 */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .form-left h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 16px;
    }

    .form-left p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .contact-item-group {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .form-box {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color var(--transition-fast);
      font-family: inherit;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary-bright);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

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

    /* 文章列表与资讯 */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      text-decoration: none;
      color: inherit;
      transition: all var(--transition-fast);
    }

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

    .article-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }

    .article-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .article-link-text {
      font-size: 0.85rem;
      color: var(--primary-bright);
      font-weight: 600;
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 友情链接与素材展示 */
    .materials-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      align-items: center;
    }

    .material-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 10px;
      box-shadow: var(--shadow-sm);
    }

    .material-box img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      display: block;
      object-fit: cover;
    }

    /* 底部通用规范 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.88rem;
      line-height: 1.7;
      margin-bottom: 16px;
      color: #94a3b8;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }

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

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: color var(--transition-fast);
    }

    .footer-links a:hover {
      color: #38bdf8;
    }

    .footer-qr-group {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .footer-qr-group img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }

    .footer-qr-group span {
      font-size: 0.8rem;
      color: #94a3b8;
    }

    .friendly-links {
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 0.85rem;
    }

    .friendly-links strong {
      color: #e2e8f0;
    }

    .friendly-links a {
      color: #94a3b8;
      text-decoration: none;
      transition: color var(--transition-fast);
    }

    .friendly-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动工具栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      text-decoration: none;
      font-weight: 700;
      transition: all var(--transition-fast);
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid,
      .about-layout,
      .form-layout,
      .materials-grid {
        grid-template-columns: 1fr;
      }

      .grid-3,
      .grid-4,
      .process-grid,
      .pricing-grid,
      .article-grid,
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .menu-toggle {
        display: block;
      }

      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 0;
      }

      .nav-links.active {
        display: flex;
      }

      .nav-links a {
        width: 100%;
        padding: 12px 16px;
      }
    }

    @media (max-width: 640px) {
      .grid-2,
      .grid-3,
      .grid-4,
      .process-grid,
      .pricing-grid,
      .article-grid,
      .metric-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }

      .hero-title {
        font-size: 1.85rem;
      }

      .section-title {
        font-size: 1.6rem;
      }

      .form-layout {
        padding: 20px;
      }
    }