/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0a3d8f;
      --primary-light: #EBF2FC;
      --accent: #00C9A7;
      --accent-dark: #009d82;
      --dark-bg: #0B132B;
      --dark-surface: #1C2541;
      --dark-card: rgba(255, 255, 255, 0.05);
      --dark-border: rgba(255, 255, 255, 0.12);
      --page-bg: #F4F6F9;
      --text-main: #111827;
      --text-muted: #4B5563;
      --border-color: #E5E7EB;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 2px 8px rgba(15, 82, 186, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 82, 186, 0.08);
      --shadow-lg: 0 10px 30px -5px rgba(15, 82, 186, 0.12);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--page-bg);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      padding-bottom: 60px;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部通知条 */
    .top-bar {
      background: var(--dark-bg);
      color: #9CA3AF;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .top-bar span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      display: inline-block;
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      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;
    }
    .site-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .brand-mark {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 24px;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: #374151;
      padding: 8px 4px;
      position: relative;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover::after, .nav-menu a.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 16px rgba(15, 82, 186, 0.35);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
    }
    .btn-accent:hover {
      background: var(--accent-dark);
      transform: translateY(-1px);
    }
    .btn-outline {
      border-color: #D1D5DB;
      background: #fff;
      color: #374151;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: #111;
      cursor: pointer;
    }

    /* Section 通用布局与间距 */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 999px;
      text-transform: uppercase;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. 首屏获客区：白皮书封面 + 目录 + 留资 */
    #hero {
      padding: 60px 0 80px;
      background: linear-gradient(180deg, #FFFFFF 0%, #F4F6F9 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 18px;
    }
    .hero-content h1 span {
      color: var(--primary);
    }
    .hero-intro {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 32px;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 600;
      color: #374151;
      box-shadow: var(--shadow-sm);
    }
    .badge-pill i {
      color: var(--accent);
      font-weight: bold;
    }
    .report-card-wrap {
      background: #FFFFFF;
      border: 1px solid #E5E7EB;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .report-card-wrap::before {
      content: "行业级发布";
      position: absolute;
      top: 16px;
      right: 16px;
      background: rgba(0, 201, 167, 0.12);
      color: var(--accent-dark);
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
    }
    .report-preview-box {
      display: flex;
      gap: 16px;
      margin-bottom: 20px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .report-thumb {
      width: 100px;
      height: 128px;
      flex-shrink: 0;
      border-radius: 4px;
      overflow: hidden;
      border: 1px solid #D1D5DB;
      box-shadow: 0 4px 10px rgba(0,0,0,0.06);
    }
    .report-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .report-meta h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      line-height: 1.4;
    }
    .report-meta p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .report-chapters {
      list-style: none;
      margin-bottom: 20px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .report-chapters li {
      font-size: 13px;
      color: #4B5563;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .report-chapters li span {
      color: var(--primary);
      font-weight: 700;
      font-size: 11px;
      background: var(--primary-light);
      padding: 2px 6px;
      border-radius: 3px;
    }
    .hero-form-box {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .hero-form-box input, .hero-form-box select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border 0.2s;
    }
    .hero-form-box input:focus, .hero-form-box select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }

    /* 2. 板块：产品架构与合规资质 (id="overview") */
    #overview {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
    }
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .topo-visual-wrap {
      background: var(--dark-bg);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .topo-visual-wrap img {
      width: 100%;
      height: 340px;
      object-fit: cover;
      border-radius: var(--radius-sm);
      filter: contrast(105%) brightness(95%);
    }
    .topo-layer-float {
      position: absolute;
      bottom: 24px;
      left: 24px;
      right: 24px;
      background: rgba(11, 19, 43, 0.85);
      backdrop-filter: blur(8px);
      padding: 14px 18px;
      border-radius: 6px;
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #E2E8F0;
      font-size: 13px;
      line-height: 1.5;
    }
    .overview-text-block h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .param-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .param-item {
      border-left: 3px solid var(--primary);
      padding-left: 12px;
      background: var(--page-bg);
      padding-top: 8px;
      padding-bottom: 8px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    .param-item .param-title {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }
    .param-item .param-val {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-top: 2px;
    }

    /* 3. 板块：无人机智能管控核心优势 (id="features", 3x2网格) */
    #features {
      background: var(--page-bg);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: all 0.3s ease;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 18px;
    }
    .feature-card h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 4. 板块：全矩阵软件系统模块 (id="products", 3列宽卡片) */
    #products {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-box {
      background: var(--page-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .product-box.featured {
      background: #FFFFFF;
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-lg);
    }
    .product-badge-flag {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 999px;
    }
    .product-box h4 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .product-box .target-use {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 16px;
    }
    .product-box .tech-specs {
      list-style: none;
      margin: 20px 0 28px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex-grow: 1;
    }
    .tech-specs li {
      font-size: 13px;
      color: #4B5563;
      border-bottom: 1px dashed #E5E7EB;
      padding-bottom: 8px;
      display: flex;
      justify-content: space-between;
    }
    .tech-specs li strong {
      color: var(--text-main);
    }

    /* 5. 板块：深色空域协同实战与技术理念 (id="tech-concept") */
    #tech-concept {
      background: var(--dark-bg);
      color: #FFFFFF;
      overflow: hidden;
      position: relative;
    }
    #tech-concept::before {
      content: "";
      position: absolute;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(15, 82, 186, 0.25) 0%, rgba(11, 19, 43, 0) 70%);
      top: -100px;
      right: -100px;
      pointer-events: none;
    }
    .dark-inner-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .radar-visual-frame {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--dark-border);
      background: var(--dark-card);
      box-shadow: 0 0 40px rgba(0, 201, 167, 0.1);
    }
    .radar-visual-frame img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      opacity: 0.85;
    }
    .radar-sweep-line {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
      animation: radarScan 3.5s infinite linear;
    }
    @keyframes radarScan {
      0% { top: 0%; opacity: 0; }
      50% { opacity: 1; }
      100% { top: 100%; opacity: 0; }
    }
    .concept-points {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 24px;
    }
    .concept-card {
      background: var(--dark-card);
      border: 1px solid var(--dark-border);
      padding: 18px 20px;
      border-radius: var(--radius-sm);
    }
    .concept-card h5 {
      color: var(--accent);
      font-size: 16px;
      margin-bottom: 6px;
      font-weight: 700;
    }
    .concept-card p {
      font-size: 13px;
      color: #9CA3AF;
      line-height: 1.6;
    }

    /* 6. 板块：典型行业场景用户故事 (id="cases", 左右交错) */
    #cases {
      background: var(--page-bg);
    }
    .case-story-item {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }
    .case-story-item:last-child {
      margin-bottom: 0;
    }
    .case-story-item.reverse {
      grid-template-columns: 1.1fr 1fr;
    }
    .case-story-item.reverse .case-img-box {
      order: 2;
    }
    .case-img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 280px;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-detail h4 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .case-stats-row {
      display: flex;
      gap: 24px;
      margin: 20px 0;
      padding: 16px 0;
      border-top: 1px solid #F3F4F6;
      border-bottom: 1px solid #F3F4F6;
    }
    .stat-pill strong {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
    }
    .stat-pill span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 7. 板块：空域作业与航线里程关键数据 (id="metrics", 4列大数) */
    #metrics {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 60px 0;
    }
    .metrics-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-col {
      padding: 16px;
    }
    .metric-col .num {
      font-size: 44px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
    }
    .metric-col .num small {
      font-size: 20px;
      font-weight: 700;
      margin-left: 2px;
    }
    .metric-col .label {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-top: 8px;
    }
    .metric-col .sub {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 8. 板块：企业级用户信赖评价 (id="testimonials", 3列证言) */
    #testimonials {
      background: var(--page-bg);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
    }
    .testi-card blockquote {
      font-size: 14px;
      line-height: 1.7;
      color: #374151;
      margin-bottom: 20px;
      font-style: normal;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F3F4F6;
      padding-top: 16px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }
    .author-info h6 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. 板块：无人机行业动态与技术资讯 (id="news", 3篇卡片) */
    #news {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: var(--page-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      transition: all 0.3s;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #D1D5DB;
    }
    .news-card-img {
      height: 180px;
      overflow: hidden;
    }
    .news-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .news-card:hover .news-card-img img {
      transform: scale(1.04);
    }
    .news-card-body {
      padding: 22px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: #9CA3AF;
      margin-bottom: 8px;
    }
    .news-card-body h4 {
      font-size: 16px;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .news-card-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
      margin-bottom: 16px;
    }
    .news-anchor {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 10. 板块：技术异议拆解手风琴 (id="faq", 6个核心抗拒点) */
    #faq {
      background: var(--page-bg);
      border-top: 1px solid var(--border-color);
    }
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-header {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }
    .faq-header:hover {
      color: var(--primary);
    }
    .faq-icon-cross {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: #9CA3AF;
    }
    .faq-accordion-item.active .faq-icon-cross {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      padding: 0 24px;
      background: #FAFAFA;
      border-top: 1px solid transparent;
    }
    .faq-accordion-item.active .faq-content {
      padding: 18px 24px;
      border-top-color: var(--border-color);
    }
    .faq-content p {
      font-size: 14px;
      color: #4B5563;
      line-height: 1.7;
    }

    /* 11. 板块：安全与技术合规保障条 (id="guarantee") */
    #guarantee {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      padding: 50px 0;
    }
    .guarantee-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-box {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      padding: 12px;
    }
    .guarantee-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: rgba(0, 201, 167, 0.15);
      color: var(--accent-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      flex-shrink: 0;
    }
    .guarantee-txt h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .guarantee-txt p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 12. 板块：底部强触达转化与表单 (id="contact") */
    #contact {
      background: var(--dark-bg);
      color: #FFFFFF;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .contact-split-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .contact-left h3 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .contact-left p {
      font-size: 15px;
      color: #9CA3AF;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .contact-direct-info {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .contact-direct-info li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: #E2E8F0;
    }
    .contact-direct-info li span.tag {
      background: rgba(255, 255, 255, 0.1);
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 12px;
      color: var(--accent);
    }
    .contact-form-panel {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      color: var(--text-main);
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    }
    .contact-form-panel h4 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .contact-form-panel .sub {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #374151;
      margin-bottom: 6px;
    }
    .form-group input, .form-group select, .form-group textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border 0.2s;
    }
    .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }
    .form-submit-btn {
      width: 100%;
      padding: 12px;
      font-size: 15px;
      font-weight: 700;
      margin-top: 8px;
    }

    /* 底部固定转化浮动条 (FAB) */
    .floating-action-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 998;
      background: rgba(11, 19, 43, 0.94);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding: 10px 0;
      transform: translateY(100%);
      transition: transform 0.3s ease;
    }
    .floating-action-bar.visible {
      transform: translateY(0);
    }
    .fab-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }
    .fab-desc {
      color: #FFFFFF;
      font-size: 14px;
      font-weight: 500;
    }
    .fab-desc span {
      color: var(--accent);
      font-weight: 700;
      margin-left: 8px;
    }
    .fab-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* 全局页脚 (Footer) */
    .site-footer {
      background: #080D1E;
      color: #9CA3AF;
      font-size: 13px;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 12px;
    }

    /* 移动端与平板响应式适配 */
    @media (max-width: 1024px) {
      .hero-grid, .dark-inner-grid, .overview-grid, .contact-split-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .features-grid, .products-grid, .testimonial-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar-grid, .guarantee-bar-grid, .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-story-item, .case-story-item.reverse {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .case-story-item.reverse .case-img-box {
        order: unset;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 50px 0;
      }
      .section-title {
        font-size: 24px;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        display: none;
      }
      .nav-menu.open {
        display: flex;
      }
      .nav-menu a {
        width: 100%;
        padding: 12px 0;
        border-bottom: 1px solid #F3F4F6;
      }
      .nav-actions {
        display: none;
      }
      .features-grid, .products-grid, .testimonial-grid, .news-grid, .metrics-bar-grid, .guarantee-bar-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .param-list {
        grid-template-columns: 1fr;
      }
      .fab-desc {
        display: none;
      }
      .fab-actions {
        width: 100%;
        justify-content: space-between;
      }
      .fab-actions .btn {
        flex: 1;
      }
    }