/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-hover: #0a355c;
      --accent: #00A3E0;
      --accent-soft: rgba(0, 163, 224, 0.12);
      --dark-section: #0B192C;
      --dark-card: #132238;
      --bg-base: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-xl: 0 20px 25px -5px rgba(15,76,129,0.12), 0 8px 10px -6px rgba(15,76,129,0.08);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

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

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

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

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    /* 顶部服务信息条 */
    .top-bar {
      background-color: var(--primary);
      color: #E2E8F0;
      font-size: 0.8125rem;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .top-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .top-bar-items {
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }

    /* 主导航 */
    .site-header {
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
    }
    .brand-logo-badge {
      font-size: 0.7rem;
      font-weight: 600;
      background: var(--accent);
      color: #fff;
      padding: 2px 6px;
      border-radius: var(--radius-sm);
      text-transform: uppercase;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 1.75rem;
      list-style: none;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.5rem 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: var(--transition);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.55rem 1.25rem;
      background: var(--primary);
      color: #fff;
      font-weight: 600;
      font-size: 0.875rem;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      min-height: 44px;
      transition: var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      padding: 0.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero 全宽沉浸 */
    .hero-section {
      position: relative;
      background-color: var(--dark-section);
      background-image: linear-gradient(180deg, rgba(11, 25, 44, 0.82) 0%, rgba(15, 76, 129, 0.75) 100%), url('/assets/images/59ae8af82d167460.jpg');
      background-size: cover;
      background-position: center;
      color: #FFFFFF;
      padding: 5.5rem 0 4.5rem;
      overflow: hidden;
    }
    .hero-content {
      max-width: 820px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-tag {
      display: inline-block;
      padding: 0.35rem 0.85rem;
      background: rgba(0, 163, 224, 0.25);
      border: 1px solid var(--accent);
      color: #7dd3fc;
      border-radius: 999px;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      letter-spacing: 0.05em;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 1.25rem;
      letter-spacing: -0.01em;
    }
    .hero-desc {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 2rem;
    }
    .hero-countdown-bar {
      display: inline-flex;
      align-items: center;
      gap: 1.5rem;
      background: rgba(19, 34, 56, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(10px);
      padding: 0.75rem 1.75rem;
      border-radius: var(--radius-md);
      margin-bottom: 2.25rem;
    }
    .countdown-item {
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .countdown-val {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .countdown-lbl {
      font-size: 0.7rem;
      color: #94A3B8;
      margin-top: 2px;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--accent);
      color: #FFFFFF;
      font-weight: 600;
      padding: 0.85rem 1.85rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--accent);
      min-height: 48px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: #008ec3;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(0, 163, 224, 0.3);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      color: #FFFFFF;
      font-weight: 600;
      padding: 0.85rem 1.85rem;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.4);
      min-height: 48px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
      transform: translateY(-2px);
    }

    /* 板块通用 */
    .section-wrap {
      padding: 5rem 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 3.5rem;
    }
    .section-sub {
      color: var(--accent);
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      margin-bottom: 0.5rem;
      display: block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    .section-lead {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 2：关于系统图文交错 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .about-media {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .about-media img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .media-badge {
      position: absolute;
      bottom: 1.25rem;
      left: 1.25rem;
      background: rgba(11, 25, 44, 0.85);
      backdrop-filter: blur(8px);
      color: #fff;
      padding: 0.75rem 1.25rem;
      border-radius: var(--radius-md);
      border-left: 3px solid var(--accent);
      font-size: 0.85rem;
    }
    .about-text h3 {
      font-size: 1.45rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--primary);
    }
    .feature-points {
      list-style: none;
      margin: 1.5rem 0;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
    }
    .feature-point-item {
      background: #FFFFFF;
      padding: 0.85rem 1rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.875rem;
      color: var(--text-main);
      font-weight: 500;
      border-left: 3px solid var(--accent);
    }

    /* 板块 3：优势六网格 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .adv-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-xl);
      border-color: rgba(0, 163, 224, 0.4);
    }
    .adv-icon-box {
      width: 48px;
      height: 48px;
      background: var(--accent-soft);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 1.25rem;
      font-size: 1.15rem;
    }
    .adv-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
      color: var(--text-main);
    }
    .adv-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 4：产品矩阵横向卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .product-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-xl);
    }
    .product-thumb {
      height: 220px;
      width: 100%;
      object-fit: cover;
    }
    .product-body {
      padding: 1.5rem;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      align-self: flex-start;
      font-size: 0.75rem;
      background: var(--accent-soft);
      color: var(--primary);
      font-weight: 600;
      padding: 0.25rem 0.65rem;
      border-radius: 999px;
      margin-bottom: 0.75rem;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .product-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
      line-height: 1.6;
    }
    .param-list {
      list-style: none;
      margin-top: auto;
      border-top: 1px dashed var(--border-color);
      padding-top: 1rem;
      margin-bottom: 1.25rem;
    }
    .param-item {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      margin-bottom: 0.4rem;
    }
    .param-label {
      color: var(--text-muted);
    }
    .param-val {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 板块 5：深色解决方案 */
    .dark-section {
      background-color: var(--dark-section);
      color: #FFFFFF;
      border-bottom: none;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-lead {
      color: #94A3B8;
    }
    .solution-bento {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 2rem;
      align-items: center;
    }
    .solution-box {
      background: var(--dark-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
    }
    .solution-steps {
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
      margin-top: 1.75rem;
    }
    .step-node {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }
    .step-idx {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--accent);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.875rem;
      flex-shrink: 0;
    }
    .step-body h5 {
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 0.25rem;
      color: #F1F5F9;
    }
    .step-body p {
      font-size: 0.8125rem;
      color: #94A3B8;
      line-height: 1.5;
    }

    /* 板块 6：作业实测案例墙 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .case-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      width: 40%;
      object-fit: cover;
    }
    .case-content {
      width: 60%;
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .case-text {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 1rem;
    }
    .case-stat {
      background: #F1F5F9;
      padding: 0.5rem 0.75rem;
      border-radius: var(--radius-sm);
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* 板块 7：关键效能统计条 */
    .metrics-strip {
      background: var(--primary);
      color: #FFFFFF;
      padding: 3.5rem 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: center;
    }
    .metric-value {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1;
      margin-bottom: 0.5rem;
      color: #38BDF8;
    }
    .metric-title {
      font-size: 0.875rem;
      color: #E2E8F0;
      font-weight: 500;
    }

    /* 板块 8：客户口碑评价 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .testi-card {
      background: var(--surface);
      padding: 2rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-quote {
      font-size: 0.9rem;
      color: var(--text-main);
      font-style: normal;
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent-soft);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .author-meta h6 {
      font-size: 0.9rem;
      font-weight: 700;
    }
    .author-meta p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 板块 9：前沿资讯动态 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .news-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
    }
    .news-card img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 1.5rem;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
    }
    .news-heading {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
      line-height: 1.4;
    }
    .news-body p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 10：FAQ 手风琴 */
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 0.85rem;
      overflow: hidden;
    }
    .faq-item details {
      width: 100%;
    }
    .faq-item summary {
      padding: 1.15rem 1.5rem;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      color: var(--text-main);
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: '+';
      font-size: 1.25rem;
      font-weight: 400;
      color: var(--accent);
      transition: var(--transition);
    }
    .faq-item details[open] summary::after {
      content: '−';
    }
    .faq-answer {
      padding: 0 1.5rem 1.25rem;
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 11：保障承诺条 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .guarantee-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      padding: 1.75rem 1.25rem;
      border-radius: var(--radius-sm);
      text-align: center;
      transition: var(--transition);
    }
    .guarantee-card:hover {
      border-color: var(--accent);
    }
    .guarantee-icon {
      font-size: 1.75rem;
      margin-bottom: 0.75rem;
      color: var(--primary);
    }
    .guarantee-card h5 {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 0.35rem;
    }
    .guarantee-card p {
      font-size: 0.775rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 12：咨询表单与 CTA */
    .contact-box {
      background: var(--surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-xl);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.3fr;
    }
    .contact-info {
      background: linear-gradient(135deg, var(--primary) 0%, #0a3154 100%);
      color: #fff;
      padding: 3rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-info h3 {
      font-size: 1.65rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .contact-info p {
      color: #CBD5E1;
      font-size: 0.9rem;
      line-height: 1.7;
      margin-bottom: 2rem;
    }
    .contact-hotline {
      font-size: 1.75rem;
      font-weight: 800;
      color: #38BDF8;
      letter-spacing: 0.05em;
    }
    .contact-form-pane {
      padding: 3rem;
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.4rem;
    }
    .form-control {
      width: 100%;
      padding: 0.75rem 0.9rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      transition: var(--transition);
      background-color: #fff;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-soft);
    }
    .form-submit {
      width: 100%;
      padding: 0.85rem;
      background: var(--primary);
      color: #fff;
      font-weight: 600;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      min-height: 48px;
    }
    .form-submit:hover {
      background: var(--primary-hover);
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--dark-section);
      color: #94A3B8;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.85rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 1rem;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 0.95rem;
      font-weight: 600;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.775rem;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .adv-grid, .product-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
      }
      .about-grid, .solution-bento, .cases-grid, .contact-box {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-content {
        width: 100%;
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .mobile-toggle { display: block; }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.show { display: flex; }
      .nav-cta { display: none; }
      .hero-title { font-size: 2rem; }
      .adv-grid, .product-grid, .testimonials-grid, .news-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .contact-info, .contact-form-pane {
        padding: 2rem 1.5rem;
      }
      .section-wrap {
        padding: 3.5rem 0;
      }
    }