/* roulang page: index */
:root {
      --primary: #1B4B8A;
      --primary-hover: #143765;
      --accent: #0070F3;
      --accent-soft: #EBF5FF;
      --success: #059669;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --dark-bg: #0F172A;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.05), 0 1px 2px -1px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 12px 20px -3px rgba(27, 75, 138, 0.12), 0 4px 6px -4px rgba(27, 75, 138, 0.06);
      --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);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea, select {
      font-family: inherit;
      font-size: inherit;
      color: inherit;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    .section-py {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    .section-header {
      margin-bottom: 3.5rem;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--accent-soft);
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      margin-bottom: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.7;
    }
    .text-center { text-align: center; }
    .mx-auto { margin-left: auto; margin-right: auto; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.8125rem 1.75rem;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      gap: 0.5rem;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 10px rgba(27, 75, 138, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(27, 75, 138, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background-color: #FFFFFF;
      color: var(--primary);
      border-color: var(--border-color);
    }
    .btn-outline:hover {
      background-color: #F1F5F9;
      border-color: #CBD5E1;
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
      border-color: #CBD5E1;
    }

    /* 顶部双行导航 */
    .top-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 0.45rem 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .site-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--primary);
      letter-spacing: -0.01em;
    }
    .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.75rem;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.5rem 0;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0.5rem;
      color: var(--text-main);
    }

    /* 首屏 Hero Carousel */
    .hero-section {
      position: relative;
      background: #0B132B;
      color: #FFFFFF;
      overflow: hidden;
    }
    .carousel-container {
      position: relative;
      min-height: 600px;
    }
    .carousel-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.8s ease-in-out, visibility 0.8s;
      display: flex;
      align-items: center;
    }
    .carousel-slide.active {
      opacity: 1;
      visibility: visible;
      position: relative;
    }
    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background-size: cover;
      background-position: center;
      opacity: 0.28;
      mix-blend-mode: luminosity;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 860px;
      padding: 5.5rem 0;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.35rem 0.85rem;
      background: rgba(0, 112, 243, 0.25);
      border: 1px solid rgba(0, 112, 243, 0.5);
      border-radius: 9999px;
      font-size: 0.85rem;
      color: #93C5FD;
      margin-bottom: 1.25rem;
    }
    .hero-title {
      font-size: 3rem;
      line-height: 1.18;
      font-weight: 800;
      margin-bottom: 1.35rem;
      letter-spacing: -0.03em;
    }
    .hero-title span {
      background: linear-gradient(90deg, #FFFFFF, #93C5FD);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.125rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 2rem;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
      margin-bottom: 2.25rem;
    }
    .badge-chip {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      padding: 0.35rem 0.75rem;
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
      color: #E2E8F0;
    }
    .hero-cta {
      display: flex;
      gap: 1.25rem;
      align-items: center;
    }
    .carousel-indicators {
      position: absolute;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 10;
      display: flex;
      gap: 8px;
    }
    .indicator-btn {
      width: 32px;
      height: 4px;
      border-radius: 2px;
      background: rgba(255, 255, 255, 0.3);
      border: none;
      cursor: pointer;
      transition: var(--transition);
    }
    .indicator-btn.active {
      background: var(--accent);
      width: 48px;
    }
    .carousel-nav-btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      z-index: 10;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: var(--transition);
    }
    .carousel-nav-btn:hover {
      background: var(--accent);
    }
    .prev-btn { left: 24px; }
    .next-btn { right: 24px; }

    /* 通用栅格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2.25rem;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }

    /* 痛点卡片 */
    .pain-card {
      padding: 2.25rem;
      background: #FFFFFF;
      border-top: 4px solid #DC2626;
    }
    .pain-icon-wrapper {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #FEF2F2;
      color: #DC2626;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
    }
    .pain-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      color: var(--text-main);
    }
    .pain-text {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 1.25rem;
    }
    .pain-metric {
      font-size: 0.8125rem;
      color: #991B1B;
      background: #FFF1F2;
      padding: 0.4rem 0.75rem;
      border-radius: var(--radius-sm);
      display: inline-block;
      font-weight: 600;
    }

    /* 系统介绍排版 */
    .about-visual {
      background: linear-gradient(145deg, #1E293B, #0F172A);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      color: #fff;
      border: 1px solid #334155;
    }
    .dashboard-preview {
      background: #090E17;
      border-radius: var(--radius-md);
      padding: 1.5rem;
      border: 1px solid #1E293B;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }
    .dash-row {
      display: flex;
      justify-content: space-between;
      border-bottom: 1px solid #1E293B;
      padding: 0.65rem 0;
      font-size: 0.875rem;
    }
    .dash-row:last-child { border-bottom: none; }
    .dash-label { color: #94A3B8; }
    .dash-val { color: #38BDF8; font-weight: 600; }
    .spec-check-list {
      list-style: none;
      margin-top: 1.5rem;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .spec-item {
      display: flex;
      align-items: flex-start;
      gap: 0.85rem;
      font-size: 0.9375rem;
      color: var(--text-muted);
    }
    .spec-icon {
      color: var(--success);
      flex-shrink: 0;
      margin-top: 2px;
    }

    /* 流程步骤横向流 */
    .process-card {
      padding: 2rem 1.75rem;
      position: relative;
      background: #FFFFFF;
    }
    .process-num {
      font-size: 2.5rem;
      font-weight: 800;
      color: #E2E8F0;
      line-height: 1;
      margin-bottom: 0.75rem;
      font-family: Arial, sans-serif;
    }
    .process-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
      color: var(--primary);
    }
    .process-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 核心优势6宫格 */
    .advantage-card {
      padding: 2.25rem 2rem;
      background: #FFFFFF;
    }
    .adv-icon-box {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--accent-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
    }
    .adv-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
      color: var(--text-main);
    }
    .adv-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 产品方案 */
    .product-card {
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .product-media {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-media img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .product-target {
      font-size: 0.8125rem;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 1rem;
    }
    .product-specs {
      list-style: none;
      margin-bottom: 1.5rem;
      flex-grow: 1;
      border-top: 1px dashed var(--border-color);
      padding-top: 1rem;
    }
    .product-specs li {
      display: flex;
      justify-content: space-between;
      font-size: 0.84rem;
      padding: 0.35rem 0;
      color: var(--text-muted);
    }
    .product-specs li span:last-child {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 深色反转哲学板块 */
    .dark-section {
      background-color: var(--dark-bg);
      color: #FFFFFF;
    }
    .dark-card {
      background: #1E293B;
      border: 1px solid #334155;
      border-radius: var(--radius-md);
      padding: 2.25rem;
    }

    /* 案例卡片 */
    .case-card {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
      padding: 1.75rem;
      align-items: center;
    }
    .case-content h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .case-content p {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
      line-height: 1.65;
    }
    .comparison-box {
      background: #F1F5F9;
      border-radius: var(--radius-sm);
      padding: 0.85rem;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
      font-size: 0.8125rem;
    }
    .comp-item span {
      display: block;
      color: var(--text-muted);
      margin-bottom: 0.15rem;
    }
    .comp-item strong {
      color: var(--primary);
      font-size: 1rem;
    }

    /* 成果指标条 */
    .metric-strip {
      background: linear-gradient(90deg, #1B4B8A, #0070F3);
      color: #FFFFFF;
      padding: 3.5rem 0;
    }
    .metric-box {
      text-align: center;
    }
    .metric-val {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 0.5rem;
      font-family: Georgia, Cambria, "Times New Roman", Times, serif;
    }
    .metric-label {
      font-size: 0.9375rem;
      color: #E0E7FF;
      font-weight: 500;
    }

    /* 用户评价 */
    .testimonial-card {
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-quote {
      font-size: 0.9375rem;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 1.5rem;
      font-style: normal;
    }
    .testi-user {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      border-top: 1px solid var(--border-color);
      padding-top: 1rem;
    }
    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 0.875rem;
    }
    .user-info h4 {
      font-size: 0.875rem;
      font-weight: 700;
    }
    .user-info p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 资讯列表 */
    .news-card {
      padding: 1.5rem;
    }
    .news-meta {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
      display: flex;
      justify-content: space-between;
    }
    .news-title {
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      line-height: 1.45;
    }
    .news-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 1rem;
    }
    .news-link {
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 0.85rem;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item summary {
      padding: 1.25rem 1.5rem;
      font-weight: 700;
      font-size: 1.0625rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      user-select: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-arrow {
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    details[open] .faq-arrow {
      transform: rotate(180deg);
    }
    .faq-content {
      padding: 0 1.5rem 1.25rem 1.5rem;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #F1F5F9;
      padding-top: 1rem;
    }

    /* 表单获客转化区 */
    .contact-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 3rem;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 0.4rem;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #F8FAFC;
      transition: var(--transition);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--accent);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.15);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0A0F1D;
      color: #94A3B8;
      font-size: 0.875rem;
      padding-top: 4.5rem;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding: 1.75rem 0;
      text-align: center;
      font-size: 0.8125rem;
    }
    .footer-bottom a {
      color: #94A3B8;
    }
    .footer-bottom a:hover {
      color: #FFFFFF;
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
      .hero-title { font-size: 2.35rem; }
      .case-card { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 1rem;
      }
      .nav-links.active { display: flex; }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .hero-title { font-size: 1.85rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .contact-wrapper { padding: 1.75rem; }
      .carousel-nav-btn { display: none; }
    }