/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0A2D4D;
      --accent: #00A896;
      --accent-hover: #02897A;
      --bg: #F8FAFC;
      --white: #FFFFFF;
      --dark-accent: #0A192F;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --radius: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 4px 6px -1px rgba(15, 76, 129, 0.05), 0 10px 15px -3px rgba(15, 76, 129, 0.08);
      --shadow-hover: 0 20px 25px -5px rgba(15, 76, 129, 0.12);
      --container-max: 1240px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.65;
      font-size: 16px;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
      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;
    }
    
    /* 顶部微型信息栏 */
    .topbar {
      background-color: #07213A;
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .topbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .topbar-meta {
      display: flex;
      gap: 20px;
    }
    .topbar-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 主导航栏 */
    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .site-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .site-logo .badge-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 24px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .btn-header {
      background-color: var(--accent);
      color: var(--white);
      padding: 9px 20px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
      display: inline-block;
    }
    .btn-header:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(0, 168, 150, 0.25);
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 6px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--white);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--border);
      background-color: var(--white);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 板块通用 */
    .section-block {
      padding: 90px 0;
    }
    .section-block.alt-bg {
      background-color: var(--white);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--accent);
      background: rgba(0, 168, 150, 0.1);
      padding: 4px 14px;
      border-radius: 4px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 板块 1: 首屏 (Hero) */
    .hero-section {
      background: linear-gradient(135deg, rgba(10, 45, 77, 0.94), rgba(15, 76, 129, 0.92)), url('/assets/images/d524f170b82a78ef.jpg') center/cover no-repeat;
      color: var(--white);
      padding: 100px 0 110px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      color: var(--white);
    }
    .hero-desc {
      font-size: 17px;
      line-height: 1.8;
      color: #E2E8F0;
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .code-console {
      background: #0A192F;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    .console-bar {
      background: #112240;
      padding: 12px 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .console-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #E53E3E;
    }
    .console-dot:nth-child(2) { background: #DD6B20; }
    .console-dot:nth-child(3) { background: #38A169; }
    .console-title {
      color: #94A3B8;
      font-size: 13px;
      margin-left: 8px;
      font-family: monospace;
    }
    .console-content {
      padding: 24px;
      font-family: 'Consolas', 'Courier New', monospace;
      font-size: 13.5px;
      line-height: 1.7;
      color: #64FFDA;
    }
    .console-content .dim { color: #8892B0; }
    .console-content .key { color: #CCD6F6; }
    .console-content .val { color: #FFB86C; }

    /* 板块 2: 参数与验证 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .about-image {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .specs-table {
      margin-top: 28px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--white);
      overflow: hidden;
    }
    .specs-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 14.5px;
    }
    .specs-row:last-child {
      border-bottom: none;
    }
    .specs-row .label {
      color: var(--text-muted);
      font-weight: 500;
    }
    .specs-row .val {
      color: var(--primary);
      font-weight: 700;
    }

    /* 板块 3: 研发与量产优势 (6卡片) */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card-advantage {
      background: var(--white);
      border: 1px solid var(--border);
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .card-advantage:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: #CBD5E1;
    }
    .card-num {
      font-size: 20px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
    }
    .card-advantage h3 {
      font-size: 19px;
      color: var(--text-main);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .card-advantage p {
      font-size: 14.5px;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* 板块 4: 材料产品矩阵 (3大卡片) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .product-thumb {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-body h3 {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .product-desc {
      font-size: 14.5px;
      color: var(--text-body);
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .product-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }
    .ptag {
      background: #EDF2F7;
      color: var(--text-muted);
      font-size: 12px;
      padding: 3px 10px;
      border-radius: 4px;
      font-weight: 500;
    }

    /* 板块 5: 场景演示 (交错流) */
    .flow-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
      margin-bottom: 64px;
    }
    .flow-row:last-child {
      margin-bottom: 0;
    }
    .flow-row.reverse .flow-img {
      order: 2;
    }
    .flow-row.reverse .flow-info {
      order: 1;
    }
    .flow-img {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .flow-info h3 {
      font-size: 24px;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .flow-info p {
      font-size: 15px;
      line-height: 1.75;
      margin-bottom: 20px;
    }
    .flow-metrics {
      display: flex;
      gap: 24px;
    }
    .f-metric {
      border-left: 3px solid var(--accent);
      padding-left: 12px;
    }
    .f-metric-val {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .f-metric-label {
      font-size: 12.5px;
      color: var(--text-muted);
    }

    /* 板块 6: 深色沉浸理念 */
    .dark-section {
      background-color: var(--dark-accent);
      color: #CBD5E1;
      padding: 96px 0;
    }
    .dark-section .section-title {
      color: var(--white);
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .tech-step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .tech-step-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 28px 20px;
      border-radius: var(--radius);
      position: relative;
    }
    .tech-step-badge {
      font-size: 13px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 12px;
    }
    .tech-step-card h4 {
      font-size: 18px;
      color: var(--white);
      margin-bottom: 10px;
    }
    .tech-step-card p {
      font-size: 13.5px;
      line-height: 1.65;
      color: #94A3B8;
    }

    /* 板块 7: 协同案例 (案例研讨) */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .case-head {
      border-bottom: 1px solid var(--border);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }
    .case-client {
      font-size: 14px;
      color: var(--accent);
      font-weight: 600;
    }
    .case-head h3 {
      font-size: 20px;
      color: var(--text-main);
      margin-top: 4px;
    }
    .case-desc {
      font-size: 15px;
      margin-bottom: 24px;
    }
    .case-stats {
      display: flex;
      gap: 32px;
      background: var(--bg);
      padding: 16px 20px;
      border-radius: var(--radius);
    }
    .c-stat-val {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
    }
    .c-stat-lbl {
      font-size: 12.5px;
      color: var(--text-muted);
    }

    /* 板块 8: 数据统计条 */
    .metrics-bar {
      background: linear-gradient(90deg, #0F4C81 0%, #072B4C 100%);
      color: var(--white);
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-number {
      font-size: 40px;
      font-weight: 800;
      color: #64FFDA;
      margin-bottom: 8px;
    }
    .metric-title {
      font-size: 15px;
      color: #E2E8F0;
      font-weight: 500;
    }

    /* 板块 9: 评价卡片 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .t-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
    }
    .stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
    }
    .t-quote {
      font-size: 14.5px;
      line-height: 1.7;
      color: var(--text-body);
      margin-bottom: 20px;
      font-style: italic;
    }
    .t-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .t-avatar-box {
      width: 44px;
      height: 44px;
      background: #E2E8F0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .t-user-info h5 {
      font-size: 15px;
      color: var(--text-main);
    }
    .t-user-info span {
      font-size: 12.5px;
      color: var(--text-muted);
    }

    /* 板块 10: 资讯三联卡 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 12.5px;
      margin-bottom: 12px;
    }
    .news-badge {
      color: var(--accent);
      font-weight: 600;
    }
    .news-date {
      color: var(--text-muted);
    }
    .news-card h4 {
      font-size: 17px;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-card p {
      font-size: 13.5px;
      color: var(--text-body);
      line-height: 1.65;
      flex-grow: 1;
    }
    .news-card a {
      margin-top: 16px;
      font-size: 13.5px;
      color: var(--primary);
      font-weight: 600;
    }

    /* 板块 11: FAQ 原生手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: '+';
      font-size: 20px;
      color: var(--primary);
    }
    .faq-item[open] summary::after {
      content: '−';
    }
    .faq-item[open] summary {
      background: #F1F5F9;
      border-bottom: 1px solid var(--border);
    }
    .faq-body {
      padding: 20px 24px;
      font-size: 14.5px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 板块 12: 项目转化 CTA 表单 */
    .contact-card-box {
      background: linear-gradient(145deg, #0F4C81, #082F52);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: var(--white);
      box-shadow: 0 20px 25px -5px rgba(15, 76, 129, 0.2);
    }
    .contact-inner-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .contact-info h3 {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--white);
    }
    .contact-info p {
      font-size: 15.5px;
      line-height: 1.75;
      color: #E2E8F0;
      margin-bottom: 28px;
    }
    .guarantee-badges {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .g-badge-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: #CBD5E1;
    }
    .g-icon {
      color: var(--accent);
      font-weight: 700;
    }
    .inquiry-form {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13.5px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--accent);
    }

    /* 页脚 */
    .site-footer {
      background: var(--dark-accent);
      color: #94A3B8;
      padding: 72px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: var(--white);
      font-size: 16px;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .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;
      font-size: 13px;
    }

    /* 移动端悬浮条 */
    .floating-cta {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 999;
      display: flex;
      align-items: center;
      background: var(--accent);
      color: var(--white);
      padding: 12px 20px;
      border-radius: 50px;
      box-shadow: 0 10px 20px rgba(0, 168, 150, 0.35);
      font-weight: 600;
      font-size: 14px;
      gap: 8px;
    }
    .floating-cta:hover {
      background: var(--accent-hover);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .about-grid, .contact-inner-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .grid-3x2, .products-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-step-grid, .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .topbar {
        display: none;
      }
      .section-block {
        padding: 56px 0;
      }
      .hero-title {
        font-size: 30px;
      }
      .section-title {
        font-size: 25px;
      }
      .grid-3x2, .products-grid, .testimonials-grid, .news-grid, .cases-grid, .tech-step-grid, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .flow-row, .flow-row.reverse {
        grid-template-columns: 1fr;
        gap: 28px;
      }
      .flow-row.reverse .flow-img {
        order: 1;
      }
      .flow-row.reverse .flow-info {
        order: 2;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .contact-card-box {
        padding: 32px 20px;
      }
      .inquiry-form {
        padding: 20px;
      }
    }