/* roulang page: index */
:root {
      --primary-dark: #0F172A;
      --primary-deep: #0A0F1D;
      --accent-teal: #0D9488;
      --accent-emerald: #10B981;
      --accent-amber: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-alt: #F1F5F9;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
      --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
      --shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.12), 0 8px 10px -6px rgb(0 0 0 / 0.06);
      --transition: all 0.25s ease-in-out;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: 1rem;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section-padding {
      padding: 88px 0;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--accent-teal);
      background-color: rgba(13, 148, 136, 0.1);
      padding: 4px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.125rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-dark);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      min-height: 48px;
      white-space: nowrap;
    }

    .btn:focus-visible {
      outline: none;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.35);
    }

    .btn-primary {
      background-color: var(--accent-teal);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }

    .btn-primary:hover {
      background-color: #0b7a6f;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(13, 148, 136, 0.35);
    }

    .btn-emerald {
      background-color: var(--accent-emerald);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
    }

    .btn-emerald:hover {
      background-color: #059669;
      transform: translateY(-2px);
    }

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

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

    /* 顶部通知与导航 */
    .top-utility-bar {
      background-color: var(--primary-deep);
      color: var(--text-light);
      font-size: 0.8125rem;
      height: 38px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .top-utility-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .main-navbar {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.3px;
    }

    .logo-icon-box {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--accent-teal), var(--accent-emerald));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--accent-teal);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: var(--primary-dark);
      cursor: pointer;
      padding: 6px;
    }

    /* 1. Hero 白皮书模式 */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
      padding: 70px 0 90px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1.05fr;
      gap: 56px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 22px;
      letter-spacing: -0.8px;
    }

    .hero-lead {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .hero-badge-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .whitepaper-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .whitepaper-card-inner {
      display: grid;
      grid-template-columns: 140px 1fr;
      gap: 24px;
      margin-bottom: 24px;
    }

    .whitepaper-cover {
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: 0 4px 10px rgba(0,0,0,0.12);
      border: 1px solid var(--border-color);
      height: 190px;
      background: var(--bg-alt);
    }

    .whitepaper-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .whitepaper-summary h4 {
      font-size: 1.125rem;
      color: var(--primary-dark);
      margin-bottom: 10px;
      font-weight: 700;
    }

    .summary-item {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: flex-start;
      gap: 8px;
      line-height: 1.5;
    }

    .summary-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--accent-teal);
      margin-top: 7px;
      flex-shrink: 0;
    }

    .hero-quick-form {
      border-top: 1px dashed var(--border-color);
      padding-top: 20px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .input-group-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .form-input-field {
      width: 100%;
      height: 44px;
      padding: 0 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background-color: var(--bg-light);
      color: var(--text-main);
      font-size: 0.875rem;
      transition: var(--transition);
    }

    .form-input-field:focus {
      outline: none;
      border-color: var(--accent-teal);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }

    /* 2. 传统痛点分析 */
    .pain-section {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .pain-card {
      background-color: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      transition: var(--transition);
      position: relative;
    }

    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }

    .pain-card-icon {
      width: 48px;
      height: 48px;
      background: #FEE2E2;
      color: #DC2626;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }

    .pain-card h3 {
      font-size: 1.1875rem;
      margin-bottom: 12px;
      color: var(--primary-dark);
      font-weight: 700;
    }

    .pain-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 3. 核心解决方案 */
    .solution-section {
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }

    .solution-showcase {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .solution-media {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .solution-media img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    .solution-text h3 {
      font-size: 1.75rem;
      margin-bottom: 16px;
      color: var(--primary-dark);
      font-weight: 700;
    }

    .solution-text p {
      font-size: 1rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.7;
    }

    .solution-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .check-icon {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(16, 185, 129, 0.15);
      color: var(--accent-emerald);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      margin-top: 2px;
    }

    .check-icon svg {
      width: 14px;
      height: 14px;
    }

    /* 4. 业务场景演示 */
    .scenario-section {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
    }

    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card {
      background-color: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .scenario-thumb {
      height: 180px;
      width: 100%;
      overflow: hidden;
      background: var(--bg-alt);
    }

    .scenario-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .scenario-card:hover .scenario-thumb img {
      transform: scale(1.05);
    }

    .scenario-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .scenario-body h3 {
      font-size: 1.1875rem;
      margin-bottom: 10px;
      color: var(--primary-dark);
      font-weight: 700;
    }

    .scenario-body p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .scenario-meta {
      font-size: 0.8125rem;
      color: var(--accent-teal);
      font-weight: 600;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    /* 5. 深色战略对比区 */
    .methodology-section {
      background: linear-gradient(145deg, #0A0F1D 0%, #0F172A 100%);
      color: #FFFFFF;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .methodology-section .section-title {
      color: #FFFFFF;
    }

    .methodology-section .section-desc {
      color: var(--text-light);
    }

    .compare-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 20px;
    }

    .compare-col {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 32px;
    }

    .compare-col.is-pro {
      border-color: rgba(16, 185, 129, 0.3);
      background: rgba(16, 185, 129, 0.02);
    }

    .compare-header {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .compare-items {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .compare-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.9375rem;
      line-height: 1.6;
      color: #CBD5E1;
    }

    .cross-badge {
      color: #F87171;
      font-weight: bold;
      flex-shrink: 0;
    }

    .check-badge {
      color: var(--accent-emerald);
      font-weight: bold;
      flex-shrink: 0;
    }

    /* 6. 社会认同与客户案例 */
    .stories-section {
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }

    .stories-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .story-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .story-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
    }

    .industry-badge {
      font-size: 0.8125rem;
      padding: 4px 10px;
      background: var(--bg-alt);
      color: var(--text-muted);
      border-radius: 4px;
      font-weight: 500;
    }

    .metric-pill {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--accent-emerald);
      background: rgba(16, 185, 129, 0.1);
      padding: 4px 12px;
      border-radius: var(--radius-full);
    }

    .story-card h3 {
      font-size: 1.25rem;
      margin-bottom: 14px;
      color: var(--primary-dark);
      font-weight: 700;
    }

    .story-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .story-author {
      font-size: 0.875rem;
      color: var(--text-main);
      font-weight: 600;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    /* 7. 效能统计条 */
    .metrics-bar-section {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      padding: 48px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-box {
      border-right: 1px solid var(--border-color);
      padding: 0 16px;
    }

    .metric-box:last-child {
      border-right: none;
    }

    .metric-num {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--accent-teal);
      line-height: 1.1;
      margin-bottom: 8px;
      letter-spacing: -1px;
    }

    .metric-label {
      font-size: 0.9375rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 8. 真实决策者评价 */
    .testimonials-section {
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }

    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .star-row {
      color: #FBBF24;
      margin-bottom: 14px;
      font-size: 1.1rem;
      display: flex;
      gap: 2px;
    }

    .review-quote {
      font-size: 0.9375rem;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }

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

    .reviewer-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--accent-teal);
    }

    .reviewer-name {
      font-weight: 700;
      font-size: 0.9375rem;
      color: var(--primary-dark);
    }

    .reviewer-title {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 9. 行业研究与资讯内嵌 */
    .insights-section {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
    }

    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .insight-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      background: var(--bg-light);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .insight-card:hover {
      background: #FFFFFF;
      border-color: var(--accent-teal);
      box-shadow: var(--shadow-md);
    }

    .insight-date {
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 10px;
    }

    .insight-card h3 {
      font-size: 1.125rem;
      color: var(--primary-dark);
      margin-bottom: 12px;
      font-weight: 700;
      line-height: 1.4;
    }

    .insight-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .insight-readtime {
      font-size: 0.8125rem;
      color: var(--accent-teal);
      font-weight: 600;
    }

    /* 10. 套餐与功能矩阵对比 */
    .pricing-matrix-section {
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .matrix-table th, .matrix-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9375rem;
    }

    .matrix-table th {
      background-color: #F8FAFC;
      color: var(--primary-dark);
      font-weight: 700;
    }

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

    .matrix-badge-true {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: var(--accent-emerald);
      font-weight: 600;
    }

    .matrix-badge-false {
      color: var(--text-light);
    }

    /* 11. 常见顾虑拆解 FAQ */
    .faq-section {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
    }

    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .faq-question {
      padding: 22px 28px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--primary-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-icon {
      font-size: 1.25rem;
      color: var(--text-muted);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      padding: 0 28px 22px 28px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 安全保障与服务承诺条 */
    .guarantee-section {
      background: #FFFFFF;
      padding: 44px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .guarantee-icon {
      width: 44px;
      height: 44px;
      background: rgba(13, 148, 136, 0.1);
      color: var(--accent-teal);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .guarantee-text h4 {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 2px;
    }

    .guarantee-text p {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 13. 底部终极转化表单区 */
    .conversion-cta-section {
      background: linear-gradient(135deg, var(--primary-deep) 0%, #0F172A 100%);
      color: #FFFFFF;
      padding: 88px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .conversion-card-box {
      max-width: 880px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 48px;
      backdrop-filter: blur(10px);
    }

    .conversion-card-box h2 {
      font-size: 2.125rem;
      font-weight: 800;
      text-align: center;
      margin-bottom: 16px;
      color: #FFFFFF;
    }

    .conversion-card-box p {
      text-align: center;
      color: var(--text-light);
      margin-bottom: 36px;
      font-size: 1.0625rem;
    }

    .conversion-form {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

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

    .form-dark-input {
      width: 100%;
      height: 48px;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-sm);
      padding: 0 16px;
      color: #FFFFFF;
      font-size: 0.9375rem;
      transition: var(--transition);
    }

    .form-dark-input:focus {
      outline: none;
      border-color: var(--accent-emerald);
      background: rgba(255, 255, 255, 0.1);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }

    .form-dark-input option {
      background-color: var(--primary-dark);
      color: #FFFFFF;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--primary-deep);
      color: var(--text-light);
      padding: 64px 0 32px 0;
      font-size: 0.875rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1.2fr 1.2fr 2fr;
      gap: 48px;
      margin-bottom: 48px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-nav {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-nav a:hover {
      color: var(--accent-emerald);
    }

    .footer-about-text {
      line-height: 1.7;
      margin: 16px 0 20px 0;
      color: var(--text-light);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 移动端与响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
      }
      .scenario-grid, .pain-grid, .insights-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .metric-box:nth-child(2) {
        border-right: none;
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-utility-bar {
        display: none;
      }
      .section-padding {
        padding: 56px 0;
      }
      .section-title {
        font-size: 1.625rem;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .solution-showcase {
        grid-template-columns: 1fr;
      }
      .compare-box {
        grid-template-columns: 1fr;
      }
      .stories-grid {
        grid-template-columns: 1fr;
      }
      .scenario-grid, .pain-grid, .insights-grid, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .whitepaper-card-inner {
        grid-template-columns: 1fr;
      }
      .whitepaper-cover {
        height: 160px;
      }
      .input-group-row, .conversion-form {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .conversion-card-box {
        padding: 28px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .metric-box {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 20px;
      }
      .metric-box:last-child {
        border-bottom: none;
      }
    }